RecNo KArRecNo KArAge KArErr KArMin KArAnalType KArLabNo KArDecCon K2Opct 40ArRad PctRadAr SampSuit AddRef KArComm KArSampCom KArAnalCom KArOthrCom 3 1 1843.47 90 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.82 315 age of metamorphic crystallization RADIOGENIC ARGON GREATER THAN 85% 4 1 2409.21 120 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.94 505 minimum age of intrusion RADIOGENIC ARGON GREATER THAN 85% 5 1 1325.18 65 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 240 minimum age of metamorphic crystallization RADIOGENIC ARGON GREATER THAN 85% 6 1 41.63 1.4 biotite conventional K-Ar G-B0506/AM-X17837 "4.72E-04, 0.585E-04, 1.19E-04*" 8.17 4.954 65 minimum age of intrusion "SAMPLE CONTAINS 95% BIOTITE PLUS QUARTZ, FELDSPAR, ETC. MESH SIZE -60+200." 7 1 3.17 sanidine 37Ar-41Ar total fusion 21 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 0.42 17 age not evaluated ERROR NOT QUOTED 7 2 2.04 sanidine 37Ar-41Ar total fusion 21 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 0.27 20 age not evaluated ANALYTICAL ERROR NOT QUOTED 7 3 5.73 sanidine 37Ar-41Ar total fusion 21 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 0.76 19 age not evaluated ANALYTICAL ERROR NOT QUOTED 7 4 3.02 sanidine 37Ar-41Ar total fusion 21 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 0.4 15 age not evaluated ANALYTICAL ERROR NOT QUOTED 10 1 2863.09 90 biotite conventional K-Ar 378 "4.72E-04, 0.585E-04, 1.19E-04*" 7.81 788.9 99 minimum age of intrusion 11 1 2734.79 80 biotite conventional K-Ar 3209 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 808.5 99 minimum age of intrusion 12 1 2693.34 80 biotite conventional K-Ar 3342 "4.72E-04, 0.585E-04, 1.19E-04*" 8.43 755.4 99 minimum age of intrusion 13 1 2714.93 80 biotite conventional K-Ar 351 "4.72E-04, 0.585E-04, 1.19E-04*" 8.6 782.6 99 minimum age of intrusion 14 1 2709.07 80 biotite conventional K-Ar 3296 "4.72E-04, 0.585E-04, 1.19E-04*" 7.73 700.5 99 minimum age of intrusion 15 1 2704.06 80 biotite conventional K-Ar 3201 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 758.5 99 minimum age of intrusion AVERAGED ARGON CONTENT LISTED 16 1 2732.76 80 biotite conventional K-Ar 3160 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 844.2 99 minimum age of intrusion 17 1 2671.76 80 biotite conventional K-Ar 3117 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 784.4 99 minimum age of intrusion 18 1 2721.12 80 biotite conventional K-Ar 491 "4.72E-04, 0.585E-04, 1.19E-04*" 7.63 697.4 99 minimum age of intrusion 19 1 2748.73 80 biotite conventional K-Ar 466 "4.72E-04, 0.585E-04, 1.19E-04*" 8.53 795.1 99 minimum age of intrusion AVERAGED ARGON CONTENT LISTED 20 1 2736.68 80 biotite conventional K-Ar 456 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 798.5 99 minimum age of intrusion AVERAGED ARGON CONTENT LISTED 21 1 2434.97 70 biotite conventional K-Ar 496 "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 501.5 98 minimum age of intrusion 22 1 2472.26 70 biotite conventional K-Ar 498 "4.72E-04, 0.585E-04, 1.19E-04*" 5.75 438.6 99 minimum age of intrusion 23 1 2633.67 80 biotite conventional K-Ar 3290 "4.72E-04, 0.585E-04, 1.19E-04*" 6.19 531.4 99 minimum age of intrusion 24 1 2502.91 80 biotite conventional K-Ar 3324 "4.72E-04, 0.585E-04, 1.19E-04*" 7.26 566.5 99 minimum age of intrusion AVERAGED ARGON CONTENT LISTED 25 1 2447.92 70 biotite conventional K-Ar 3260 "4.72E-04, 0.585E-04, 1.19E-04*" 2.71 203 98 minimum age of intrusion AVERAGED ARGON CONTENT LISTED 26 1 2572.43 80 biotite conventional K-Ar 3314 "4.72E-04, 0.585E-04, 1.19E-04*" 5.67 465.6 98 minimum age of intrusion AVERAGED ARGON CONTENT LISTED 27 1 2501.55 80 biotite conventional K-Ar 4120 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 647 99 minimum age of metamorphic crystallization 28 1 2498.04 80 biotite conventional K-Ar 4102 "4.72E-04, 0.585E-04, 1.19E-04*" 7.11 552.8 99 minimum age of metamorphic crystallization 29 1 2617.56 80 biotite conventional K-Ar 4101 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 699.2 99 minimum age of metamorphic crystallization 30 1 2510.65 80 biotite conventional K-Ar 3397 "4.72E-04, 0.585E-04, 1.19E-04*" 7.88 618.4 99 minimum age of metamorphic crystallization 31 1 2492.41 80 biotite conventional K-Ar 4194 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 634.9 99 minimum age of metamorphic crystallization 32 1 2505.41 80 biotite conventional K-Ar 3421 "4.72E-04, 0.585E-04, 1.19E-04*" 3.67 286.9 98 minimum age of metamorphic crystallization 33 1 2437.63 70 biotite conventional K-Ar 4128 "4.72E-04, 0.585E-04, 1.19E-04*" 3.83 284.7 98 minimum age of metamorphic crystallization 34 1 2479.2 70 biotite conventional K-Ar 3375 "4.72E-04, 0.585E-04, 1.19E-04*" 6.25 479.2 99 minimum age of intrusion 35 1 2372.53 70 biotite conventional K-Ar 4181 "4.72E-04, 0.585E-04, 1.19E-04*" 7.19 508.9 99 minimum age of metamorphic crystallization AVERAGED ARGON CONTENT LISTED 36 1 2506.76 80 biotite conventional K-Ar 3440 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 644.8 99 minimum age of metamorphic crystallization 37 1 2464.1 70 biotite conventional K-Ar 4220 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 612.6 99 minimum age of metamorphic crystallization 38 1 2402.3 70 biotite conventional K-Ar 4222 "4.72E-04, 0.585E-04, 1.19E-04*" 8.79 636.3 98 minimum age of metamorphic crystallization 39 1 39.68 2.1 hornblende conventional K-Ar L-949 "4.72E-04, 0.585E-04, 1.19E-04*" 0.599 0.346 25 age meaning uncertain (analysis questionable and geologic factors "ANALYZED MATERIAL CONSISTED OF HORNBLENDE PLUS AEGIRINE-AUGITE, -60+100 MESH" 40 1 49.95 1.6 hornblende conventional K-Ar L-950 "4.72E-04, 0.585E-04, 1.19E-04*" 0.506 0.369 42 age of intrusion ANALYZED MATERIAL CONTAINED HORNBLENDE PLUS AUGITE; -60 +100 MESH 41 1 55.51 2.2 augite-ferroaugite conventional K-Ar L-1018 "4.72E-04, 0.585E-04, 1.19E-04*" 0.207 0.168 30 age of intrusion ANALYZED AUGITE CONTAINED 5% IMPURITIES. AVERAGED POTASSIUM CONTENT LISTED 42 1 50.92 1.7 aegerine (acmite) conventional K-Ar L-1115 "4.72E-04, 0.585E-04, 1.19E-04*" 0.195 0.145 35 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES 43 1 1.11 0.4 phlogopite conventional K-Ar L-1019 "4.72E-04, 0.585E-04, 1.19E-04*" 10.19 0.163 5 age of intrusion 44 1 1810 40 amphiboles conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.1658 0.7436 93 minimum age of intrusion 45 1 1686 40 amphiboles conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.1915 0.7687 70 minimum age of intrusion 46 1 1877 40 amphiboles conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.1643 7.81 80 minimum age of intrusion 47 1 47.42 2.3 hornblende conventional K-Ar DKA1439 "4.72E-04, 0.584E-04, 1.19E-04*" 0.61 0.422 62 minimum age of volcanism POTASSIUM CONTENT DETERMINED BY ISOTOPE DILUTION IN REPLICATE 48 1 47.2 1.8 hornblende conventional K-Ar DKA-1437 "4.72E-04, 0.584E-04, 1.19E-04*" 0.658 0.453 76 age of volcanism "POTASSIUM CONTENT DETERMINED BY ISOTOPE DILUTION ANALYSES, IN REPLICATE" 49 1 75 1.5 biotite conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 9.79 92 age of volcanism 49 2 74.06 0.7 biotite conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.48 9.23 94 age of volcanism 50 1 1500.64 80 whole rock conventional K-Ar BT-21 "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 38.08 85 Baadsgaard and Mueller (1973) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 51 1 1962.32 100 whole rock conventional K-Ar BT-29 "4.72E-04, 0.585E-04, 1.19E-04*" 1.67 85.34 98 Baadsgaard and Mueller (1973) POTASSIUM DETERMINED BY X-RAY FLUORSCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER 52 1 2157.82 110 whole rock conventional K-Ar BT-31 "4.72E-04, 0.585E-04, 1.19E-04*" 0.39 23.37 98 Baadsgaard and Mueller (1973) POTASSIUM DETERMINED BY GRAVIMETRIC METHOD. ARGON CONTENT CALCULCATED BY COMPILER. 53 1 740.87 40 whole rock conventional K-Ar BT-33 "4.72E-04, 0.585E-04, 1.19E-04*" 1.16 15.3 95 Baadsgaard and Mueller (1973) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER 54 1 1691.02 80 whole rock conventional K-Ar BT-37 "4.72E-04, 0.585E-04, 1.19E-04*" 1.38 55.67 98 Baadsgaard and Mueller (1973) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 55 1 1995.55 100 whole rock conventional K-Ar BT-39 "4.72E-04, 0.585E-04, 1.19E-04*" 0.58 30.47 98 Baadsgaard and Mueller (1973) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 56 1 1664.86 80 whole rock conventional K-Ar BG-2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.57 22.45 96 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 57 1 2504.59 130 whole rock conventional K-Ar BG-3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.55 42.97 98 minimum age of intrusion POTASSIUM DETEMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 58 1 1634.36 80 whole rock conventional K-Ar BG-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.62 23.74 98 minimum age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC ANALYSIS. ARGON CONTENT CALCULATED BY COMPILER. 59 1 2021.78 100 whole rock conventional K-Ar BG-11 "4.72E-04, 0.585E-04, 1.19E-04*" 0.57 30.6 97 minimum age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC ANALYSIS. ARGON CONTENT CALCULATED BY COMPILER. 60 1 1880.07 90 whole rock conventional K-Ar BG-12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.75 35.75 98 minimum age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC ANALYSIS. ARGON CONTENT CALCULATED BY COMPILER. 61 1 1594.19 80 whole rock conventional K-Ar BG-13 "4.72E-04, 0.585E-04, 1.19E-04*" 0.64 23.6 95 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 62 1 2127.12 110 whole rock conventional K-Ar A-46 "4.72E-04, 0.585E-04, 1.19E-04*" 0.38 22.22 97 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORSCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 63 1 1400.92 70 whole rock conventional K-Ar A-89 "4.72E-04, 0.585E-04, 1.19E-04*" 0.31 9.452 87 minimum age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC ANALYSIS. ARGON CONTENT CALCULATED BY COMPILER. 64 1 2107.62 110 whole rock conventional K-Ar OC-1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.06 61.02 98 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 65 1 2089.47 100 whole rock conventional K-Ar OC-2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.74 41.98 98 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 66 1 1912.44 100 whole rock conventional K-Ar OC-4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.87 42.63 99 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 67 1 1946.81 100 whole rock conventional K-Ar OC-6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 43.38 99 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 68 1 2019.87 100 whole rock conventional K-Ar OC-9 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9 48.24 96 minimum age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC ANALYSIS. ARGON CONTENT CALCULATED BY COMPILER. 69 1 1781.58 90 whole rock conventional K-Ar WRD-2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.22 53.38 99 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 70 1 1791.38 90 whole rock conventional K-Ar WRD-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.97 42.81 99 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 71 1 909.59 45 whole rock conventional K-Ar WRD-36 "4.72E-04, 0.585E-04, 1.19E-04*" 0.69 11.75 99 age meaning uncertain (analysis questionable) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 72 1 1419.48 70 whole rock conventional K-Ar WRD-37 "4.72E-04, 0.585E-04, 1.19E-04*" 1.08 33.56 99 Spall (1971) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 73 1 1482.29 70 whole rock conventional K-Ar WRD-38 "4.72E-04, 0.585E-04, 1.19E-04*" 0.84 27.8 99 Spall (1971) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 74 1 1308.94 60 whole rock conventional K-Ar WRD-40 "4.72E-04, 0.585E-04, 1.19E-04*" 0.98 27.13 99 Spall (1971) age meaning uncertain (analysis questionable) POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 75 1 2058.98 100 whole rock conventional K-Ar WRD-43 "4.72E-04, 0.585E-04, 1.19E-04*" 0.96 53.13 98 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 76 1 1889.12 90 whole rock conventional K-Ar WRD-47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.54 25.94 96 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE AND A GRAVIMETRIC METHOD. ARGON CONTENT CALCULATED BY COMPILER. 90 1 780.71 31 whole rock conventional K-Ar WY13 "4.72E-04, 0.584E-04, 1.18E-04*" 1.09 15.33 96 age of intrusion ARGON-40 DATA IS AVERAGE OF REPLICATE DETERMINATIONS; OTHER RADIOGENIC ARGON VALUE IS 85%. 91 1 823.45 33 biotite conventional K-Ar WY12A "4.72E-04, 0.584E-04, 1.18E-04*" 6.445 96.83 93 7 age of later metamorphism THIS IS ONE OF TWO BIOTITE SPLITS OF DIFFERENT MESH SIZE. 91 2 763.12 30 biotite conventional K-Ar WY12A' "4.72E-04, 0.584E-04, 1.18E-04*" 4.47 61.13 90 7 age of later metamorphism THIS IS ONE OF TWO BIOTITE SPLITS OF DIFFERENT MESH SIZE. ARGON CONTENT DETERMINED IN REPLICATE. THE OTHER RADIOGENIC ARGON VALUE IS 89%. 91 3 1488.38 60 hornblende conventional K-Ar WY12A "4.72E-04, 0.584E-04, 1.18E-04*" 0.78 25.97 93 7 age of later metamorphism POTASSIUM AND ARGON CONTENT DETERMINED IN REPLICATE; AVERAGED VALUES GIVEN. THE OTHER RADIOGENIC ARGON VALUE IS 83%. 92 1 2416.17 90 hornblende conventional K-Ar WY12B "4.72E-04, 0.584E-04, 1.18E-04*" 0.918 67.15 98 7 age of later metamorphism ARGON CONTENT DETERMINED IN REPLICATE; AVERAGED VALUE GIVEN. OTHER RADIOGENIC ARGON VALUE IS 95%. 93 1 1054.71 40 biotite conventional K-Ar WY12D "4.72E-04, 0.584E-04, 1.18E-04*" 7.29 150.4 98 7 age of later metamorphism 93 2 2481.4 100 hornblende conventional K-Ar WY12D "4.72E-04, 0.584E-04, 1.18E-04*" 0.918 70.5 97 7 age of later metamorphism 94 1 1250.57 50 biotite conventional K-Ar WY12E "4.72E-04, 0.584E-04, 1.18E-04*" 6.51 169.1 98 7 age of later metamorphism ARGON CONTENT DETERMINED IN REPLICATE; AVERAGED VALUE GIVEN. OTHER RADIOGENIC ARGON VALUE IS 97%. 95 1 2583.52 110 hornblende conventional K-Ar WY12F "4.72E-04, 0.584E-04, 1.18E-04*" 0.884 73.18 96 7 age of metamorphic crystallization 97 1 1936.69 80 biotite conventional K-Ar WY12H "4.72E-04, 0.584E-04, 1.18E-04*" 6.87 343.6 97 7 age of later metamorphism 98 1 2275.99 90 biotite conventional K-Ar WY12J "4.72E-04, 0.584E-04, 1.18E-04*" 4.88 320.8 96 7 age of later metamorphism 98 2 2587.32 100 hornblende conventional K-Ar WY12J "4.72E-04, 0.584E-04, 1.18E-04*" 0.86 71.39 98 7 age of metamorphic crystallization ARGON CONTENT DETERMINED THREE TIMES; AVERAGED VALUE GIVEN. OTHER RADIOGENIC ARGON VALUES ARE 96% AND 96%. 99 1 2581.05 100 biotite conventional K-Ar WY12N "4.72E-04, 0.584E-04, 1.18E-04*" 7.29 602.4 98 7 age of metamorphic crystallization ARGON CONTENT DETERMINED IN REPLICATE. OTHER RADIOGENIC ARGON VALUE IS 96%. 100 1 39 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" Black (1969) minimum age of volcanism ANALYTICAL DATA NOT GIVEN 101 1 39 Unk conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" Black (1969) minimum age of volcanism ANALYTICAL DATA NOT GIVEN 102 1 34 Unk conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 103 1 41.2 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" Riedel (1969) age of volcanism ANALYTICAL DATA NOT GIVEN. 104 1 34.4 1.4 glass conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" Riedel (1969) age of volcanism ANALYTICAL DATA NOT GIVEN 105 1 2725.87 140 biotite conventional K-Ar 3389 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 718.1 99 minimum age of metamorphic crystallization 106 1 2673.59 140 biotite conventional K-Ar 3437 "4.72E-04, 0.585E-04, 1.19E-04*" 6.91 610.5 99 minimum age of metamorphic crystallization 107 1 2655.32 140 biotite conventional K-Ar 4166 "4.72E-04, 0.585E-04, 1.19E-04*" 7.46 650.5 99 minimum age of metamorphic crystallization 108 1 2640.95 130 biotite conventional K-Ar 4123 "4.72E-04, 0.585E-04, 1.19E-04*" 7.19 620.5 99 minimum age of metamorphic crystallization 109 1 2503.26 130 biotite conventional K-Ar 3217 "4.72E-04, 0.585E-04, 1.19E-04*" 7.95 620.5 99 minimum age of metamorphic crystallization 110 1 2387.16 120 biotite conventional K-Ar 4199 "4.72E-04, 0.585E-04, 1.19E-04*" 4.02 287.7 77 minimum age of metamorphic crystallization 111 1 2273.44 120 biotite conventional K-Ar 4212 "4.72E-04, 0.585E-04, 1.19E-04*" 7.97 522.9 99 minimum age of metamorphic crystallization 112 1 1950 100 feldspar conventional K-Ar 4111 "4.72E-04, 0.585E-04, 1.19E-04*" 0.99 50.04 98 age not evaluated 113 1 1942.38 100 feldspar conventional K-Ar 4177 "4.72E-04, 0.585E-04, 1.19E-04*" 1.18 59.3 97 age not evaluated 114 1 1802.69 90 feldspar conventional K-Ar 3406 "4.72E-04, 0.585E-04, 1.19E-04*" 2.47 110.1 98 age not evaluated 115 1 1383.51 70 feldspar conventional K-Ar 4143 "4.72E-04, 0.585E-04, 1.19E-04*" 3.85 115.3 98 age not evaluated 116 1 2134.41 110 whole rock conventional K-Ar 3429 "4.72E-04, 0.585E-04, 1.19E-04*" 2.28 134.1 98 age not evaluated 117 1 2900.59 150 biotite conventional K-Ar 3137 "4.72E-04, 0.585E-04, 1.19E-04*" 4.73 490.4 99 age of metamorphic crystallization 118 1 3113.02 160 biotite conventional K-Ar 4115 "4.72E-04, 0.585E-04, 1.19E-04*" 8.35 1001 99 maximum age of intrusion 119 1 3037.91 160 biotite conventional K-Ar 3153 "4.72E-04, 0.585E-04, 1.19E-04*" 7.73 880.7 99 maximum age of intrusion 120 1 2792.39 140 biotite conventional K-Ar 4142 "4.72E-04, 0.585E-04, 1.19E-04*" 7.73 743.1 87 age of intrusion 121 1 2694.96 140 biotite conventional K-Ar 3143 "4.72E-04, 0.585E-04, 1.19E-04*" 6.61 593 100 age of intrusion 122 1 2778.92 140 biotite conventional K-Ar 338 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 745.6 99 age of intrusion 123 1 2743.66 140 biotite conventional K-Ar 349 "4.72E-04, 0.585E-04, 1.19E-04*" 5.63 522.9 98 age of intrusion 124 1 2662.54 140 biotite conventional K-Ar 386 "4.72E-04, 0.585E-04, 1.19E-04*" 8.05 705.6 99 age of intrusion 125 1 2999.69 150 biotite conventional K-Ar 3115 "4.72E-04, 0.585E-04, 1.19E-04*" 7.1 788.1 99 maximum age of metamorphic crystallization 126 1 2650.69 130 whole rock conventional K-Ar 4149 "4.72E-04, 0.585E-04, 1.19E-04*" 7.6 660.5 87 age of intrusion POTASSIUM CONTENT APPEARS TOO HIGH FOR WHOLE-ROCK SAMPLE; MORE LIKELY A BIOTITE WAS ANALYZED. 127 1 2927.78 150 whole rock conventional K-Ar 3225 "4.72E-04, 0.585E-04, 1.19E-04*" 0.54 57.05 96 maximum age of intrusion 128 1 2008.55 100 feldspar conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 1.47 78.06 96 age of intrusion 174 1 1578 80 Unk conventional K-Ar M78-MU "4.72E-04, 0.585E-04, 1.19E-04*" 10.42 0.3784 age of metamorphic crystallization 177 1 1.25 phlogopite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN. PHLOGOPITE IS ASSUMED TO BE THE ANALYZED MATERIAL. 178 1 1.25 phlogopite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN. PHLOGOPITE IS ASSUMED TO BE THE ANALYZED MATERIAL. 179 1 3.72 1 whole rock conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04*" 2.85 0.1526 29 age of volcanism -60+100 MESH SIZE 180 1 94 biotite conventional K-Ar #4 "4.72E-04, 0.585E-04, 1.19E-04*" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE "DECAY CONSTANTS: LAMBDA-BETA=4.76 E-10/YR, LAMBDA-EPSILON=0.589 E-10/YR, 40K/K=1.181 E-04 ATOM PERCENT" 180 2 97 sanidine conventional K-Ar #4 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE 181 1 96 biotite conventional K-Ar #3 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE 181 2 96 sanidine conventional K-Ar #3 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE SEE RECORD 180 FOR DECAY CONSTANTS 182 1 90 biotite conventional K-Ar #2 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE. 182 2 93 sanidine conventional K-Ar #2 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE. DECAY CONSTANTS - SEE RECORD 180 183 1 90 biotite conventional K-Ar #1B "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE. 183 2 94 sanidine conventional K-Ar #1B "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE. LISTED AGE IS AVERAGE OF TWO DETERMINATIONS: 93.7 AND 94.8 M.Y. DECAY CONSTANTS - SEE RECORD 180 184 1 86 biotite conventional K-Ar #1A "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE. 184 2 94 sanidine conventional K-Ar #1A "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN IN ARTICLE. DECAY CONSTANTS - SEE RECORD 180 185 1 35.2 sanidine conventional K-Ar KA895 "4.72E-04, 0.585E-04, 1.19E-04" 4.31 93 age of volcanism ANALYZED MATERIAL CONSISTED OF SANIDINE (70%) AND PLAGIOCLASE (30%). NO ARGON CONTENT GIVEN. 186 1 33.3 biotite conventional K-Ar KA897 "4.72E-04, 0.585E-04, 1.19E-04" 6.55 23 age of volcanism ANALYZED MATERIAL CONSISTED OF BIOTITE WITH SEVERAL PERCENT OF HORNBLENDE. NO ARGON CONTENT GIVEN. 187 1 32.6 biotite conventional K-Ar KA898 "4.72E-04, 0.585E-04, 1.19E-04" 8.35 69 age of volcanism NO ARGON CONTENT GIVEN 188 1 33.7 biotite conventional K-Ar KA899 "4.72E-04, 0.585E-04, 1.19E-04" 8.01 59 age of volcanism NO ARGON CONTENT GIVEN. 189 1 35.7 sanidine conventional K-Ar KA900 "4.72E-04, 0.585E-04, 1.19E-04" 5.19 94 age of volcanism ANALYZED MATERIAL CONSISTED OF SANIDINE (80%) AND PLAGIOCLASE (20%). NO ARGON CONTENT GIVEN. 190 1 31.6 biotite conventional K-Ar KA1032 "4.72E-04, 0.585E-04, 1.19E-04" 8.16 72 age of volcanism NO ARGON CONTENT GIVEN. 191 1 9.2 glass conventional K-Ar KA929 "4.72E-04, 0.585E-04, 1.19E-04" 4.84 69 age of volcanism NO ARGON CONTENT GIVEN. 192 1 49.2 biotite conventional K-Ar KA1012 "4.72E-04, 0.585E-04, 1.19E-04" 5.51 44 age of volcanism NO ARGON CONTENT GIVEN 193 1 45.4 biotite conventional K-Ar KA1018 "4.72E-04, 0.585E-04, 1.19E-04" 8.31 94 age of volcanism NO ARGON CONTENT GIVEN. 194 1 49 biotite conventional K-Ar KA1021 "4.72E-04, 0.585E-04, 1.19E-04" 7.97 78 age of volcanism NO ARGON CONTENT GIVEN. 195 1 45 biotite conventional K-Ar KA1024 "4.72E-04, 0.585E-04, 1.19E-04" 7.77 30 age of volcanism NO ARGON CONTENT GIVEN 196 1 2410 100 muscovite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN "DECAY CONSTANTS: LAMBDA-BETA=4.83 E-10/YR, LAMBDA EPSILON=0.585 E-10/YR" 196 2 1570 60 K feldspar conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 196 3 1810 70 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 197 1 2410 100 muscovite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN "DECAY CONSTANTS: LAMBDA-BETA=4.83 E-10/YR, LAMBDA-EPSILON=0.585 E-10/YR" 198 1 2470 100 muscovite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 198 2 1850 70 K feldspar conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN SEE RECORD 196 FOR DECAY CONSTANTS 199 1 2460 100 muscovite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 199 2 2250 90 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN SEE RECORD 196 FOR DECAY CONSTANTS 200 1 1510 60 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism ANALYZED MATERIAL CONSISTED OF BIOTITE AND CHLORITE. NO ANALYTICAL DATA WAS GIVEN. 200 2 2490 100 muscovite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN SEE RECORD 196 FOR DECAY CONSTANTS 201 1 2100 80 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN. SEE RECORD 196 FOR DECAY CONSTANTS 202 1 2050 80 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN. SEE RECORD 196 FOR DECAY CONSTANTS 203 1 1840 70 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN. SEE RECORD 196 FOR DECAY CONSTANTS 204 1 1770 70 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN SEE RECORD 196 FOR DECAY CONSTANTS 205 1 2200 90 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN SEE RECORD 196 FOR DECAY CONSTANTS 206 1 1328.99 70 biotite conventional K-Ar B-0270 "4.72E-04, 0.585E-04, 1.19E-04*" 6.67 188.65 age of intrusion 207 1 1389.25 50 biotite conventional K-Ar B-0271 "4.72E-04, 0.585E-04, 1.19E-04*" 7.93 238.9 age of intrusion 208 1 1431.28 70 biotite conventional K-Ar B-0272 "4.72E-04, 0.585E-04, 1.19E-04*" 2.14 67.3 maximum age of intrusion ANALYZED MATERIAL CONTAINS CONSIDERABLE AMOUNT OF AMPHIBOLE AND TRACES OF PLAGIOCLASE. 209 1 41 1.6 orthoclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 5.88 3.59 age of intrusion SODA-RICH ORTHOCLASE "DECAY CONSTANTS: LAMBDA-BETA=4.83 E-10/YR, LAMBDA-EPSILON=0.585 E-10/YR" 209 2 40.99 1.6 orthoclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 5.88 3.51 age of intrusion SODA-RICH ORTHOCLASE 212 1 1693 microcline conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04*" 10.46 422.6 initial age disturbed by later metamorphism ARGON CONTENT CALCULATED BY COMPILER. 213 1 2471 50 muscovite conventional K-Ar GMYB-11 "4.8E-04, 0.58E-04*" 10.11 770.6 99 Giletti (1968) age of intrusion A SINGLE BOOK ABOUT TWO INCHES ACROSS WAS ANALYZED. LISTED DATA IS AVERAGE OF REPLICATE DETERMINATIONS. 215 1 2530 50 muscovite conventional K-Ar GMYB-16 "4.8E-04, 0.58E-04*" 10.53 838.2 99 Giletti (1968) age of intrusion A SINGLE BOOK ABOUT 4.5 INCHES ACROSS AND 4 INCHES THICK. 216 1 2353 50 biotite conventional K-Ar GSMYB-17 "4.8E-04, 0.58E-04*" 9.29 648 96 Giletti (1968) minimum age of metamorphic crystallization 95% PURE CONCENTRATE 218 1 2548 50 biotite conventional K-Ar GSMYB-20 "4.8E-04, 0.58E-04*" 6.67 537.9 94 Giletti (1968) minimum age of metamorphic crystallization BIOTITE CONCENTRATE CONTAINED LESS THAN 5% IMPURITIES. 219 1 1497.85 60 biotite conventional K-Ar PUF-27B "4.72E-04, 0.584E-04, 1.19E-04*" 9.26 311.2 97 minimum age of metamorphic crystallization 220 1 1543.68 60 biotite conventional K-Ar PUF-25B "4.72E-04, 0.584E-04, 1.19E-04*" 6.79 238.6 98 minimum age of intrusion 220 2 1535.84 60 biotite conventional K-Ar PUF-25B "4.72E-04, 0.584E-04, 1.19E-04*" 6.79 236.8 97 minimum age of intrusion 221 1 1381.15 70 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 238.7 98 minimum age of intrusion 222 1 1359.21 70 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04*" 3 87.6 95 minimum age of intrusion 223 1 412.47 glauconite conventional K-Ar KA191 "4.72E-04, 0.584E-04, 1.19E-04*" 6.28 41.9 88 age not evaluated AGE APPEARS TO BE TOO YOUNG FOR A CAMBRIAN SAMPLE. 224 1 655.05 illite conventional K-Ar KA258 "4.72E-04, 0.584E-04, 1.19E-04*" 7.37 83.8 95 age not evaluated 224 2 715.83 illite conventional K-Ar KA259 "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 95 88 age not evaluated 16 TO 150 MICRO SIZE GRAINS FROM DISAGGREGATED SHALE 224 3 656.24 illite conventional K-Ar KA260 "4.72E-04, 0.584E-04, 1.19E-04*" 7.24 82.5 92 age not evaluated 8-16 MICRO SIZE GRAINS FROM DISAGGREGATED SHALE 224 4 538.64 illite conventional K-Ar KA261 "4.72E-04, 0.584E-04, 1.19E-04*" 7.06 63.8 92 age of volcanism LESS THAN 8 MICRO SIZE GRAINS FROM DISAGGREGATED SHALE 239 1 2470 50 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" Gast and others (1958) minimum age of intrusion NO ANALYTICAL DATA GIVEN 241 1 2520 50 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" Gast and others (1958) age of intrusion NO ANALYTICAL DATA GIVEN 242 1 2340 50 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" Gast and others (1958) minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 244 1 2540 100 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 245 1 1410 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 246 1 1970 muscovite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 247 1 2240 muscovite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 248 1 1680 muscovite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 249 1 49.2 1.5 sanidine conventional K-Ar A "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 250 1 48 1.3 biotite conventional K-Ar C "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 251 1 47.9 1.3 sanidine conventional K-Ar E "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 251 2 48.5 1.3 biotite conventional K-Ar E "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 252 1 46.1 1.2 sanidine conventional K-Ar F "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 253 1 49.3 1.4 biotite conventional K-Ar G "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; BIOTITE IS ALTERED. 254 1 47.8 1.3 sanidine conventional K-Ar H "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 254 2 47.9 1.3 biotite conventional K-Ar H "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 255 1 46.2 1.8 hornblende conventional K-Ar I "4.72E-04, 0.584E-04, 1.19E-04" Rohrer and Obradavich (1969) age of volcanism NO ANALYTICAL DATA GIVEN 256 1 46.5 2.3 hornblende conventional K-Ar J "4.72E-04, 0.584E-04, 1.19E-04" Rohrer and Obradavich (1969) age of volcanism NO ANALYTICAL DATA GIVEN 257 1 44.4 1.4 hornblende conventional K-Ar K "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 257 2 45.5 1.3 biotite conventional K-Ar K "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 258 1 47.1 1.3 biotite conventional K-Ar L "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 259 1 46.7 1.5 biotite conventional K-Ar M "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 260 1 44.6 1.2 biotite conventional K-Ar N "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 261 1 1305.47 whole rock conventional K-Ar MBT-17 "4.72E-04, 0.585E-04, 1.19E-04*" 0.62 17.1 97 initial age disturbed by later metamorphism POTASSIUM VALUE IS AVERAGE OF REPLICATE DETERMINATION. 262 1 1511.59 whole rock conventional K-Ar MBT-46 "4.72E-04, 0.585E-04, 1.19E-04*" 0.96 32.7 88 initial age disturbed by later metamorphism 263 1 1713.73 whole rock conventional K-Ar MBT-47 "4.72E-04, 0.585E-04, 1.19E-04*" 1.44 59.3 100 initial age disturbed by later metamorphism 264 1 1385.19 whole rock conventional K-Ar MBT-50A "4.72E-04, 0.585E-04, 1.19E-04*" 1.27 38.1 100 initial age disturbed by later metamorphism 265 1 1628.65 whole rock conventional K-Ar MBT-1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.15 43.8 99 initial age disturbed by later metamorphism 266 1 1710.67 whole rock conventional K-Ar MBT-2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.5 61.6 100 initial age disturbed by later metamorphism 267 1 1588.9 whole rock conventional K-Ar MBT-2B "4.72E-04, 0.585E-04, 1.19E-04*" 1.36 49.9 99 initial age disturbed by later metamorphism 268 1 2045.78 whole rock conventional K-Ar MBT-4 "4.72E-04, 0.585E-04, 1.19E-04*" 2.21 121 98 initial age disturbed by later metamorphism POTASSIUM VALUE IS AVERAGE OF REPLICATE DETERMINATIONS. 269 1 1559.16 whole rock conventional K-Ar MBT-16A "4.72E-04, 0.585E-04, 1.19E-04*" 1.5 53.5 98 initial age disturbed by later metamorphism 270 1 1677.28 whole rock conventional K-Ar MBT-21 "4.72E-04, 0.585E-04, 1.19E-04*" 1.23 49 99 initial age disturbed by later metamorphism 271 1 1365.39 whole rock conventional K-Ar MBT-55 "4.72E-04, 0.585E-04, 1.19E-04*" 1.31 38.5 90 initial age disturbed by later metamorphism 272 1 1337.03 whole rock conventional K-Ar MBT-25 "4.72E-04, 0.585E-04, 1.19E-04*" 1.56 44.5 95 initial age disturbed by later metamorphism 273 1 1609.05 whole rock conventional K-Ar MBT-26 "4.72E-04, 0.585E-04, 1.19E-04*" 1.19 44.5 97 initial age disturbed by later metamorphism 274 1 769.73 whole rock conventional K-Ar MBT-3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.23 17 96 age of intrusion 274 2 769.73 32 whole rock 40Ar-40K isochron MBT-3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.23 17 20 age of intrusion 275 1 748.83 whole rock conventional K-Ar MBT-5 "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 15.1 95 age of intrusion 275 2 748.83 32 whole rock 40Ar-40K isochron MBT-5 "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 15.1 20 age of intrusion 276 1 745.99 whole rock conventional K-Ar MBT-22 "4.72E-04, 0.585E-04, 1.19E-04*" 1.03 13.7 90 age of intrusion 276 2 745.99 32 whole rock 40Ar-40K isochron MBT-22 "4.72E-04, 0.585E-04, 1.19E-04*" 1.03 13.7 20 age of intrusion 277 1 744.76 whole rock conventional K-Ar MBT-23 "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 15 92 age of intrusion 277 2 744.76 32 whole rock 40Ar-40K isochron MBT-23 "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 15 20 age of intrusion 278 1 740.51 whole rock conventional K-Ar MBT-24 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 14.5 93 age of intrusion 278 2 740.51 32 whole rock 40Ar-40K isochron MBT-24 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 14.5 20 age of intrusion 279 1 749.03 whole rock conventional K-Ar MBT-51 "4.72E-04, 0.585E-04, 1.19E-04*" 0.98 13.1 91 age of intrusion 279 2 749.03 32 whole rock 40Ar-40K isochron MBT-51 "4.72E-04, 0.585E-04, 1.19E-04*" 0.98 13.1 20 age of intrusion 280 1 730 whole rock BT-2 no decay constants given Baadsgaard and Mueller (1973) age of intrusion N0 ANALYTICAL DATA GIVEN 285 1 1500 whole rock BT-7 no decay constants given Baadsgaard and Mueller (1973) age of intrusion NO ANALYTICAL DATA GIVEN 286 1 74.37 1.8 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 9.51 83 age of volcanism 286 2 73.45 0.7 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 9.39 94 age of volcanism 302 1 2629.87 25 hornblende conventional K-Ar 987N-0.7 "4.72E-04, 0.584E-04, 1.19E-04*" 0.62 53.08 98 26 minimum age of metamorphic crystallization 303 1 2577.63 80 hornblende conventional K-Ar 987N-2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.523 43.11 99 26 minimum age of metamorphic crystallization 304 1 2658.21 90 hornblende conventional K-Ar 987N-10 "4.72E-04, 0.584E-04, 1.19E-04*" 0.519 45.35 99 26 minimum age of metamorphic crystallization 305 1 2763.63 80 hornblende conventional K-Ar 987N-20 "4.72E-04, 0.584E-04, 1.19E-04*" 0.638 60.1 99 26 minimum age of metamorphic crystallization 306 1 1455.64 90 biotite conventional K-Ar 987D "4.72E-04, 0.584E-04, 1.19E-04*" 0.96 30.94 75 26 initial age disturbed by later metamorphism (VERY LOW POTASSIUM VALUE FOR BIOTITE SAMPLE) 307 1 1331.37 50 biotite conventional K-Ar 987G "4.72E-04, 0.584E-04, 1.19E-04*" 6.2 175.8 99 26 initial age disturbed by later metamorphism 308 1 1353.31 50 biotite conventional K-Ar 987I "4.72E-04, 0.584E-04, 1.19E-04*" 7.65 222 88 26 initial age disturbed by later metamorphism 309 1 783.05 50 whole rock conventional K-Ar 987C "4.72E-04, 0.584E-04, 1.19E-04*" 0.809 11.42 90 27 minimum age of intrusion PLAGIOCLASE AND PYROXENE ARE 0.5 TO 1.0 MM LONG. 310 1 403.1 6 plagioclase conventional K-Ar 987A "4.72E-04, 0.584E-04, 1.19E-04*" 1.209 7.862 88 27 age not evaluated 311 1 592.12 8 plagioclase conventional K-Ar 575A "4.72E-04, 0.584E-04, 1.19E-04*" 1.331 13.43 96 age not evaluated 312 1 2557.73 25 hornblende conventional K-Ar 984D "4.72E-04, 0.584E-04, 1.19E-04*" 1.711 139 99 age of metamorphic crystallization 313 1 45.05 2.6 oligoclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 0.92 0.6042 82 age of volcanism MESH SIZE -50+100 314 1 44.67 1 sanidine conventional K-Ar NOT GIVEN "4.72E-04, 0.584E-04, 1.19E-04*" 10.705 6.97 54 age of volcanism MESH SIZE -50+100 315 1 180.45 5 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.88 21.53 99 Reed and Lanphere (1972) age of intrusion 315 2 176.52 5 hornblende conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.742 1.981 89 Reed and Lanphere (1972) age of intrusion 316 1 166.51 5 biotite conventional K-Ar 2A "4.72E-04, 0.585E-04, 1.19E-04*" 7.96 19.99 97 Reed and Lanphere (1972) age of intrusion 317 1 159.29 5 hornblende conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.591 1.417 80 Reed and Lanphere (1972) age of intrusion 318 1 165.93 5 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.86 22.17 94 Reed and Lanphere (1972) age of intrusion 319 1 172.87 5 hornblende conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.226 0.5903 69 Reed and Lanphere (1972) age of intrusion 320 1 28.22 0.8 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 3.341 86 Reed and Lanphere (1972) age of intrusion 320 2 25.96 0.8 hornblende conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.398 0.1498 50 Reed and Lanphere (1972) age of intrusion 321 1 27.33 0.8 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 3.203 77 Reed and Lanphere (1972) age of intrusion 322 1 35.59 1 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.1 4.191 89 Reed and Lanphere (1972) age of intrusion 322 2 37.01 1.1 hornblende conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.462 0.2487 48 Reed and Lanphere (1972) age of intrusion 323 1 183.33 5 hornblende conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 0.224 0.6223 73 Reed and Lanphere (1972) age of intrusion 324 1 166.69 5 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 9.18 23.08 93 Reed and Lanphere (1972) age of intrusion 325 1 161.39 5 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 5.62 13.66 90 Reed and Lanphere (1972) age of intrusion 325 2 158.87 5 hornblende conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 0.44 1.052 83 Reed and Lanphere (1972) age of intrusion 326 1 157.57 5 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 7.8 18.49 94 Reed and Lanphere (1972) age of intrusion 327 1 156.04 5 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 7.1 16.66 49 Reed and Lanphere (1972) age of intrusion 327 2 164.15 5 muscovite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 23.01 71 Reed and Lanphere (1972) age of intrusion 328 1 160 5 hornblende conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 0.27 0.6491 79 Reed and Lanphere (1972) initial age disturbed by later metamorphism AGE EFFECTED BY EMPLACEMENT OF CRETACEOUS PLUTON 329 1 162.97 5 biotite conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 8.78 21.56 96 Reed and Lanphere (1972) age of intrusion ARGON VALUE IS MEAN VALUE OF 9 ANALYSES; RADIOGENIC ARGON RANGED FROM 82% TO 96% 329 2 171.7 5 hornblende conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.952 2.469 77 Reed and Lanphere (1972) age of intrusion 330 1 160.65 5 biotite conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.09 19.57 97 Reed and Lanphere (1972) age of intrusion 330 2 160.14 5 hornblende conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 0.293 0.7064 85 Reed and Lanphere (1972) age of intrusion POTASSIUM VALUE IS THE MEAN VALUE OF 11 POTASSIUM ANALYSES 331 1 87.09 2.6 biotite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 7.8 10.02 91 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 331 2 92.29 2.7 hornblende conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 0.856 1.167 85 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 332 1 79.83 2.3 biotite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 9.754 95 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 333 1 78.03 2.3 biotite conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 7.6 8.725 93 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 333 2 90.08 2.6 hornblende conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 0.855 1.137 81 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 334 1 148 4 muscovite conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 9.84 21.85 85 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 335 1 173.96 5 biotite conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 5.61 14.75 68 Reed and Lanphere (1972) age of intrusion 335 2 171.66 5 hornblende conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 0.474 1.229 58 Reed and Lanphere (1972) age of intrusion 336 1 75.62 2.2 hornblende conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 1.223 82 Reed and Lanphere (1972) age of intrusion 337 1 82.72 2.4 biotite conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 8.238 94 Reed and Lanphere (1972) age of intrusion 337 2 85.47 2.5 hornblende conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 0.965 1.216 81 Reed and Lanphere (1972) age of intrusion 338 1 44.61 1.3 biotite conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 5.03 3.271 83 Reed and Lanphere (1972) age of intrusion 339 1 62.84 1.8 biotite conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 8.1 7.457 80 Reed and Lanphere (1972) age of intrusion 339 2 61.01 1.8 hornblende conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 0.472 0.4217 48 Reed and Lanphere (1972) age of intrusion 340 1 39.62 1.2 biotite conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 4.741 84 Reed and Lanphere (1972) age of intrusion 341 1 169.7 5 hornblende conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 0.262 0.6712 42 Reed and Lanphere (1972) age of intrusion 342 1 69.48 2 biotite conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 8.648 87 Reed and Lanphere (1972) age of intrusion 343 1 50.45 1.5 biotite conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 6.372 88 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 343 2 51.07 1.5 biotite conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 6.451 86 Reed and Lanphere (1972) initial age disturbed by later metamorphism FIELD RELATIONS SUGGEST JURASSIC AGE 343 3 63.01 1.8 hornblende conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 0.978 0.9029 66 Reed and Lanphere (1972) initial age disturbed by later metamorphism 344 1 59.67 1.7 biotite conventional K-Ar 29 "4.72E-04, 0.585E-04, 1.19E-04*" 8.04 7.022 91 Reed and Lanphere (1972) age of intrusion 345 1 72.61 2.1 biotite conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 9.483 96 Reed and Lanphere (1972) age of intrusion 345 2 73.88 2.2 hornblende conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 0.676 0.734 75 Reed and Lanphere (1972) age of intrusion 346 1 158.65 5 biotite conventional K-Ar 31 "4.72E-04, 0.585E-04, 1.19E-04*" 7.82 18.67 88 Reed and Lanphere (1972) age of intrusion 347 1 166.94 5 biotite conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 7.45 18.76 95 Reed and Lanphere (1972) age of intrusion 347 2 166.27 5 hornblende conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 0.66 1.655 86 Reed and Lanphere (1972) age of intrusion 348 1 73.46 2.2 hornblende conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 1.12 1.209 84 Reed and Lanphere (1972) age of intrusion 349 1 27.82 0.6 biotite conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 3.512 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion OTHER RADIOGENIC VALUE IS 65 % 349 2 26.13 1 hornblende conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 0.37 0.1402 36 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 350 1 26.65 0.9 hornblende conventional K-Ar 35 "4.72E-04, 0.585E-04, 1.19E-04*" 0.358 0.1384 28 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 351 1 29.11 0.9 biotite conventional K-Ar 36 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 3.465 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 352 1 26.83 0.8 biotite conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 3.176 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 352 2 25.63 1 hornblende conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 0.338 0.1256 27 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 353 1 174.22 8.6 hornblende conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 0.162 0.4266 64 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 354 1 135.34 5 biotite conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 6.4 12.95 94 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism EMPLACEMENT AGE THOUGHT TO BE BETWEEN 154 TO 176 M.Y. (MIDDLE TO EARLY JURASSIC) 354 2 150.85 4.5 hornblende conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 0.992 2.247 84 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism EMPLACEMENT AGE THOUGHT TO BE BETWEEN 154 TO 176 M.Y. (MIDDLE TO EARLY JURASSIC) 355 1 155.98 4.6 biotite conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 6.8 15.95 90 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 355 2 157.24 4.6 hornblende conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 0.706 1.67 85 Reed and Lanphere (1972) age of intrusion 356 1 158.36 4.6 biotite conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 6.45 15.37 91 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 356 2 160.33 4.7 muscovite conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 22.45 93 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 357 1 97.75 2.8 biotite conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 8.92 12.9 87 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMISTRY AND PETROLOGY SUGGEST JURASSIC AGE. 358 1 162.85 4.7 biotite conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 21.69 92 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 358 2 161.33 4.7 hornblende conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 0.938 2.279 83 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 359 1 164.55 4.8 biotite conventional K-Ar 44 "4.72E-04, 0.585E-04, 1.19E-04*" 7.39 18.33 90 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 359 2 162.28 4.8 hornblende conventional K-Ar 44 "4.72E-04, 0.585E-04, 1.19E-04*" 0.632 1.545 85 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 360 1 63.12 1.8 biotite conventional K-Ar 45 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 7.805 89 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN THE BIOTITE AND HORNBLENDE AGES 360 2 69.04 2 hornblende conventional K-Ar 45 "4.72E-04, 0.585E-04, 1.19E-04*" 0.984 0.997 73 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 361 1 65.59 1.8 biotite conventional K-Ar 46 "4.72E-04, 0.585E-04, 1.19E-04*" 9.21 8.857 93 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 361 2 68.75 2 hornblende conventional K-Ar 46 "4.72E-04, 0.585E-04, 1.19E-04*" 0.826 0.8333 84 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 362 1 39.37 1.1 biotite conventional K-Ar 47 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 5.088 73 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 362 2 41.85 1.3 hornblende conventional K-Ar 47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.667 0.4066 52 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 363 1 34.79 1 biotite conventional K-Ar 48 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 4.187 82 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 364 1 38.6 1.1 biotite conventional K-Ar 49 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 4.954 88 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 364 2 39.31 1.9 hornblende conventional K-Ar 49 "4.72E-04, 0.585E-04, 1.19E-04*" 0.295 0.1688 29 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 365 1 72.4 2 biotite conventional K-Ar 50 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 9.253 89 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE 365 2 95.81 2.8 hornblende conventional K-Ar 50 "4.72E-04, 0.585E-04, 1.19E-04*" 0.852 1.207 84 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism HORNBLENDE AGE DISCORDANT WITH BIOTITE AGE. CHEMISTRY AND PETROLOGY SIMILAR TO JURASSIC ROCKS IN AREA. CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE 366 1 68.16 1.9 biotite conventional K-Ar 51 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 8.94 90 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 367 1 67.21 1.9 biotite conventional K-Ar 52 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 8.616 89 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN THE BIOTITE AND HORNBLENDE AGES. 367 2 71.48 2.1 hornblende conventional K-Ar 52 "4.72E-04, 0.585E-04, 1.19E-04*" 0.732 0.7684 72 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 368 1 70.03 2 biotite conventional K-Ar 53 "4.72E-04, 0.585E-04, 1.19E-04*" 9.42 9.684 87 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 368 2 74.36 2.2 hornblende conventional K-Ar 53 "4.72E-04, 0.585E-04, 1.19E-04*" 1.033 1.129 78 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 369 1 145.68 4.3 hornblende conventional K-Ar 54 "4.72E-04, 0.585E-04, 1.19E-04*" 0.537 1.173 85 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE. 370 1 65.35 1.8 biotite conventional K-Ar 55 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 8.508 88 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 370 2 67.58 2 hornblende conventional K-Ar 55 "4.72E-04, 0.585E-04, 1.19E-04*" 0.838 0.8308 65 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 371 1 65.12 1.9 biotite conventional K-Ar 56 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 8.726 96 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN THE BIOTITE AND HORNBLENDE AGES. 371 2 70.52 2 hornblende conventional K-Ar 56 "4.72E-04, 0.585E-04, 1.19E-04*" 0.784 0.8117 80 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 372 1 58.79 1.7 biotite conventional K-Ar 57 "4.72E-04, 0.585E-04, 1.19E-04*" 9.18 7.898 83 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE. 372 2 97.47 3.8 hornblende conventional K-Ar 57 "4.72E-04, 0.585E-04, 1.19E-04*" 0.731 1.054 67 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE. 373 1 37.48 1 biotite conventional K-Ar 58 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 4.754 85 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 374 1 38.58 1.1 biotite conventional K-Ar 59 "4.72E-04, 0.585E-04, 1.19E-04*" 8.8 4.941 63 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 375 1 31.89 0.9 biotite conventional K-Ar 60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.02 4.178 80 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES 375 2 36.31 1.8 hornblende conventional K-Ar 60 "4.72E-04, 0.585E-04, 1.19E-04*" 0.475 0.2508 35 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 376 1 34.55 1.3 biotite conventional K-Ar 61 "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 4.309 37 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 377 1 36.97 1 biotite conventional K-Ar 62 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 4.705 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 378 1 60.04 1.7 biotite conventional K-Ar 63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.23 8.113 74 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE 378 2 80.74 2.3 hornblende conventional K-Ar 63 "4.72E-04, 0.585E-04, 1.19E-04*" 0.895 1.064 76 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST JURASSIC AGE 379 1 64.23 1.8 biotite conventional K-Ar 64 "4.72E-04, 0.585E-04, 1.19E-04*" 6.88 6.477 83 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 379 2 66.45 1.9 hornblende conventional K-Ar 64 "4.72E-04, 0.585E-04, 1.19E-04*" 0.874 0.8517 75 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 380 1 71.31 2 biotite conventional K-Ar 65 "4.72E-04, 0.585E-04, 1.19E-04*" 9.18 9.613 86 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion SUMMIT LAKE ROCKS 380 2 70.62 2.1 hornblende conventional K-Ar 65 "4.72E-04, 0.585E-04, 1.19E-04*" 0.926 0.9602 76 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 381 1 62.34 1.8 biotite conventional K-Ar 66 "4.72E-04, 0.585E-04, 1.19E-04*" 9.54 8.712 79 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 381 2 63.47 1.9 hornblende conventional K-Ar 66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.694 0.6454 68 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 382 1 64.43 1.8 biotite conventional K-Ar 67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 8.159 86 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES 382 2 70.37 2.1 hornblende conventional K-Ar 67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.688 0.7108 64 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 383 1 58.39 1.7 biotite conventional K-Ar 68 "4.72E-04, 0.585E-04, 1.19E-04*" 5.42 4.631 91 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 384 1 54.44 1.6 biotite conventional K-Ar 69 "4.72E-04, 0.585E-04, 1.19E-04*" 9.01 7.169 78 Reed and Lanphere (1972); Reed and Lanphere (1969) minimum age of intrusion 384 2 65.19 1.9 hornblende conventional K-Ar 69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.569 0.5438 73 Reed and Lanphere (1972); Reed and Lanphere (1969) maximum age of intrusion 385 1 57.03 1.6 biotite conventional K-Ar 70 "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 7.241 95 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 386 1 97.88 3.7 hornblende conventional K-Ar 71 "4.72E-04, 0.585E-04, 1.19E-04*" 0.799 1.157 81 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST A JURASSIC AGE 387 1 59.58 1.7 biotite conventional K-Ar 72 "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 7.761 91 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST A JURASSIC AGE 387 2 59.08 1.7 hornblende conventional K-Ar 72 "4.72E-04, 0.585E-04, 1.19E-04*" 0.946 0.8179 72 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST A JURASSIC AGE 388 1 54.7 2.1 biotite conventional K-Ar 73 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 7.148 36 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST A JURASSIC AGE 388 2 60.68 2.3 hornblende conventional K-Ar 73 "4.72E-04, 0.585E-04, 1.19E-04*" 0.854 0.7588 71 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST A JURASSIC AGE 389 1 53.88 1.5 biotite conventional K-Ar 74 "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 6.905 88 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism 390 1 35.56 1.1 biotite conventional K-Ar 75 "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 4.395 57 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 391 1 36.52 1 biotite conventional K-Ar 76 "4.72E-04, 0.585E-04, 1.19E-04*" 8.6 4.568 73 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 392 1 64 1.8 biotite conventional K-Ar 77 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 8.329 85 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 393 1 58.51 1.6 biotite conventional K-Ar 78 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 7.491 78 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 394 1 57.07 1.1 biotite conventional K-Ar 79 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 7.046 85 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 395 1 40.89 1.1 biotite conventional K-Ar 80 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 5.537 74 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 396 1 34.88 1 biotite conventional K-Ar 81 "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 4.269 52 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 397 1 41.44 1.1 biotite conventional K-Ar 82 "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 5.42 80 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism 398 1 36.93 1 biotite conventional K-Ar 83 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 4.458 75 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 399 1 37.66 1.1 biotite conventional K-Ar 84 "4.72E-04, 0.585E-04, 1.19E-04*" 7.98 4.372 70 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 400 1 60.62 1.8 biotite conventional K-Ar 85 "4.72E-04, 0.585E-04, 1.19E-04*" 7.36 6.533 59 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 400 2 61.34 1.9 hornblende conventional K-Ar 85 "4.72E-04, 0.585E-04, 1.19E-04*" 0.639 0.574 60 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 401 1 61.98 1.6 biotite conventional K-Ar 86 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 7.253 88 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 402 1 61.72 1.8 biotite conventional K-Ar 87 "4.72E-04, 0.585E-04, 1.19E-04*" 7.16 6.472 73 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 402 2 56.92 1.7 hornblende conventional K-Ar 87 "4.72E-04, 0.585E-04, 1.19E-04*" 0.943 0.7851 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 403 1 57.43 1.6 biotite conventional K-Ar 88 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 6.931 93 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 404 1 109.43 3.2 hornblende conventional K-Ar 89 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7 1.137 74 Reed and Lanphere (1972); Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMICAL AND PETROLOGICAL RELATIONS SUGGEST A JURASSIC AGE 405 1 57.96 1.6 biotite conventional K-Ar 90 "4.72E-04, 0.585E-04, 1.19E-04*" 6.06 5.139 86 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 405 2 60.16 1.8 hornblende conventional K-Ar 90 "4.72E-04, 0.585E-04, 1.19E-04*" 0.807 0.7107 63 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 406 1 59.75 1.7 biotite conventional K-Ar 91 "4.72E-04, 0.585E-04, 1.19E-04*" 6.51 5.694 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 407 1 60.47 2.4 biotite conventional K-Ar 92 "4.72E-04, 0.585E-04, 1.19E-04*" 3.54 3.134 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 408 1 62.14 1.8 biotite conventional K-Ar 93 "4.72E-04, 0.585E-04, 1.19E-04*" 6.8 6.189 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 408 2 64.2 2.5 hornblende conventional K-Ar 93 "4.72E-04, 0.585E-04, 1.19E-04*" 0.344 0.3237 43 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 409 1 64.13 1.8 biotite conventional K-Ar 94 "4.72E-04, 0.585E-04, 1.19E-04*" 8.01 7.528 86 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 409 2 62.12 1.9 hornblende conventional K-Ar 94 "4.72E-04, 0.585E-04, 1.19E-04*" 0.402 0.3658 65 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 410 1 59.96 1.7 biotite conventional K-Ar 95 "4.72E-04, 0.585E-04, 1.19E-04*" 7.67 6.732 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 410 2 60.01 2.9 hornblende conventional K-Ar 95 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 0.9664 79 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 411 1 71.44 2 biotite conventional K-Ar 96 "4.72E-04, 0.585E-04, 1.19E-04*" 9.03 9.474 93 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 412 1 75.96 2.2 hornblende conventional K-Ar 97 "4.72E-04, 0.585E-04, 1.19E-04*" 1.061 1.185 77 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 413 1 59.14 1.6 biotite conventional K-Ar 98 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 7.374 76 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 414 1 40.08 1.1 biotite conventional K-Ar 99 "4.72E-04, 0.585E-04, 1.19E-04*" 8.8 5.135 79 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 415 1 56.69 1.6 biotite conventional K-Ar 100 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 6.998 74 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 416 1 26.5 0.8 biotite conventional K-Ar 101 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 3.413 77 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 416 2 26.63 0.9 hornblende conventional K-Ar 101 "4.72E-04, 0.585E-04, 1.19E-04*" 0.906 0.3499 59 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 417 1 25.77 0.8 biotite conventional K-Ar 102 "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 3.247 83 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 418 1 25.46 0.7 biotite conventional K-Ar 103 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 3.042 63 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 419 1 63.57 1.9 biotite conventional K-Ar 104 "4.72E-04, 0.585E-04, 1.19E-04*" 8.71 8.114 78 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 420 1 36.78 0.7 biotite conventional K-Ar 105 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 4.922 80 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion OTHER RADIOGENIC ARGON VALUE IS 77% 421 1 66.78 1.9 biotite conventional K-Ar 106 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 8.541 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 422 1 69.16 2 biotite conventional K-Ar 107 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 9.074 60 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 423 1 67.49 1.9 biotite conventional K-Ar 108 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 8.613 66 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 424 1 29.35 0.8 biotite conventional K-Ar 109 "4.72E-04, 0.585E-04, 1.19E-04*" 8.62 3.672 78 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 425 1 30.87 0.9 biotite conventional K-Ar 110 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 3.703 79 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 426 1 29.71 0.9 hornblende conventional K-Ar 111 "4.72E-04, 0.585E-04, 1.19E-04*" 0.972 0.4192 57 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 427 1 57.42 1.6 biotite conventional K-Ar 112 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 6.93 84 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 428 1 59.75 1.6 biotite conventional K-Ar 113 "4.72E-04, 0.585E-04, 1.19E-04*" 8.51 7.443 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 429 1 39.31 1.9 hornblende conventional K-Ar 114 "4.72E-04, 0.585E-04, 1.19E-04*" 0.428 0.2449 33 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 430 1 66.2 1.9 biotite conventional K-Ar 115 "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 8.29 91 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 431 1 57.61 1.6 biotite conventional K-Ar 116 "4.72E-04, 0.585E-04, 1.19E-04*" 8.91 7.509 84 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 432 1 66.22 1.8 biotite conventional K-Ar 117 "4.72E-04, 0.585E-04, 1.19E-04*" 8.8 8.545 92 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 433 1 56.57 1.6 biotite conventional K-Ar 118 "4.72E-04, 0.585E-04, 1.19E-04*" 8.91 7.371 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 434 1 57.14 1.6 biotite conventional K-Ar 119 "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 7.255 84 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 434 2 53.57 1.6 muscovite conventional K-Ar 119 "4.72E-04, 0.585E-04, 1.19E-04*" 10.51 8.228 77 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 435 1 57.86 1.6 biotite conventional K-Ar 120 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 7.009 88 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 436 1 57.56 1.5 biotite conventional K-Ar 121 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 7.048 94 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 437 1 57.06 1.5 biotite conventional K-Ar 122 "4.72E-04, 0.585E-04, 1.19E-04*" 8.27 6.902 88 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 438 1 56.65 1.6 biotite conventional K-Ar 123 "4.72E-04, 0.585E-04, 1.19E-04*" 9.34 7.739 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 439 1 33.61 1 biotite conventional K-Ar 124 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 4.464 87 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 439 2 36.14 1.4 hornblende conventional K-Ar 124 "4.72E-04, 0.585E-04, 1.19E-04*" 0.626 0.329 55 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 440 1 33.25 0.9 biotite conventional K-Ar 125 "4.72E-04, 0.585E-04, 1.19E-04*" 9.23 4.459 88 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES 440 2 36.27 1.6 hornblende conventional K-Ar 125 "4.72E-04, 0.585E-04, 1.19E-04*" 0.401 0.2115 55 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 441 1 35.22 0.9 biotite conventional K-Ar 126 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 4.424 81 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 441 2 36.6 1.4 hornblende conventional K-Ar 126 "4.72E-04, 0.585E-04, 1.19E-04*" 0.312 0.1661 34 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 442 1 35.35 1 biotite conventional K-Ar 127 "4.72E-04, 0.585E-04, 1.19E-04*" 8.99 4.62 88 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCES BETWEEN BIOTITE AND HORNBLENDE AGES 442 2 40.1 1.4 hornblende conventional K-Ar 127 "4.72E-04, 0.585E-04, 1.19E-04*" 0.308 0.18 46 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 443 1 37.08 1.1 biotite conventional K-Ar 128 "4.72E-04, 0.585E-04, 1.19E-04*" 6.36 3.43 84 Reed and Lanphere (1972); Reed and Lanphere (1969) A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCES BETWEEN THE BIOTITE AND HORNBLENDE AGES 443 2 39.82 1.6 hornblende conventional K-Ar 128 "4.72E-04, 0.585E-04, 1.19E-04*" 0.365 0.2116 44 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion A VERY GRADUAL COOLING OF THE PLUTON MAY EXPLAIN THE DIFFERENCE BETWEEN BIOTITE AND HORNBLENDE AGES. 444 1 57.39 1.6 biotite conventional K-Ar 129 "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 7.446 89 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 445 1 57.52 1.6 biotite conventional K-Ar 130 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 6.892 92 Reed and Lanphere (1972); Reed and Lanphere (1969) age of intrusion 446 1 27.82 0.6 biotite conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 3.512 81 Reed and Lanphere (1969) age of intrusion OTHER RADIOGENIC VALUE IS 65% 446 2 26.13 1 hornblende conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 0.37 0.1402 36 Reed and Lanphere (1969) age of intrusion 447 1 26.65 0.9 hornblende conventional K-Ar 35 "4.72E-04, 0.585E-04, 1.19E-04*" 0.358 0.1384 28 Reed and Lanphere (1969) age of intrusion 448 1 29.11 0.9 biotite conventional K-Ar 36 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 3.465 81 Reed and Lanphere (1969) age of intrusion 449 1 26.83 0.8 biotite conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 3.176 81 Reed and Lanphere (1969) age of intrusion 449 2 25.63 1 hornblende conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 0.338 0.1256 27 Reed and Lanphere (1969) age of intrusion 450 1 174.22 8.6 hornblende conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 0.162 0.4266 64 Reed and Lanphere (1969) age of intrusion 451 1 135.34 5 biotite conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 6.4 12.95 94 Reed and Lanphere (1969) initial age disturbed by later metamorphism 451 2 150.85 4.5 hornblende conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 0.992 2.247 84 Reed and Lanphere (1969) age of intrusion 452 1 155.98 4.6 biotite conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 6.8 15.95 90 Reed and Lanphere (1969) age of intrusion 452 2 157.24 4.6 hornblende conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 0.706 1.67 85 Reed and Lanphere (1969) age of intrusion 453 1 158.36 4.6 biotite conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 6.45 15.37 91 Reed and Lanphere (1969) age of intrusion 453 2 160.33 4.7 muscovite conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 22.45 93 Reed and Lanphere (1969) age of intrusion 454 1 97.75 2.8 biotite conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 8.92 12.9 87 Reed and Lanphere (1969) initial age disturbed by later metamorphism CHEMISTRY AND PETROLOGY SUGGEST SIMILARITY TO JURASSIC ROCKS IN THE AREA 455 1 162.85 4.7 biotite conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 21.69 92 Reed and Lanphere (1969) age of intrusion 455 2 161.33 4.7 hornblende conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 0.938 2.279 83 Reed and Lanphere (1969) age of intrusion 456 1 0.29 0.03 glass conventional K-Ar S17 "4.72E-04, 0.585E-04, 1.19E-04*" 4.85 0.0201 14 age of volcanism OBSIDIAN REPLICATE K ANALYSES 457 1 1.68 0.05 whole rock conventional K-Ar S19 "4.72E-04, 0.585E-04, 1.19E-04*" 2.296 0.0555 40 age of volcanism REPLICATE K ANALYSES 458 1 2.52 0.07 whole rock conventional K-Ar S20 "4.72E-04, 0.585E-04, 1.19E-04*" 2.811 0.102 67 age of volcanism REPLICATE K ANALYSES 459 1 24.61 biotite 37Ar-41Ar total fusion 158 "4.72E-04, 0.585E-04, 1.19E-04*" 6.56 2.34 77 minimum age of volcanism MIXTURE OF BIOTITE-HORNBLENDE (NO CHLORITE). ANALYTICAL ERROR IS +4 AND -2 M.Y. 460 1 3.11 0.09 whole rock conventional K-Ar S21 "4.72E-04, 0.585E-04, 1.19E-04*" 2.496 0.1119 60 age of volcanism REPLICATE K ANALYSES 461 1 2.82 0.07 whole rock conventional K-Ar S22 "4.72E-04, 0.585E-04, 1.19E-04*" 3 0.1219 age of volcanism POTASSIUM AND ARGON VALUES ARE AVERAGES OF 14 AND 7 ANALYSES RESPECTIVELY 462 1 3.54 0.1 whole rock conventional K-Ar S28 "4.72E-04, 0.585E-04, 1.19E-04*" 2.161 0.1103 65 age of volcanism REPLICATE K ANALYSES 462 2 3.6 0.11 whole rock conventional K-Ar S28 "4.72E-04, 0.585E-04, 1.19E-04*" 2.175 0.1129 67 age of volcanism REPLICATE K ANALYSES 463 1 126.28 4 muscovite conventional K-Ar 1(S-EPR4088B/C27) "4.72E-04, 0.584E-04, 1.19E-04*" 6.42 12.09 42 age of metamorphic crystallization CHROMIAN MUSCOVITE (FUCHSITE) 464 1 13.34 5 orthoclase conventional K-Ar 23(S-EPR5011A) "4.72E-04, 0.584E-04, 1.19E-04*" 15.1 2.91 18 minimum age of volcanism 465 1 104.78 biotite 37Ar-41Ar total fusion 53 "4.72E-04, 0.585E-04, 1.19E-04*" 3.85 5.98 41 minimum age of intrusion "BIOTITE PLUS 30% CHLORITE AND 10% QUARTZ, FELDSPAR, AND HORNBLENDE." ANALYTICAL ERROR IS +17 AND -2 M.Y. 466 1 18.14 1 orthoclase conventional K-Ar 24(S-EPR5011B) "4.72E-04, 0.584E-04, 1.19E-04*" 14.1 3.7 27 minimum age of volcanism 467 1 22.58 1 orthoclase conventional K-Ar 25(S-EPR5011C) "4.72E-04, 0.584E-04, 1.19E-04*" 9.78 3.2 34 minimum age of intrusion 468 1 66.67 2 biotite conventional K-Ar 26(S-EPR5011D) "4.72E-04, 0.584E-04, 1.19E-04*" 6.75 6.6 45 age of intrusion 469 1 92.31 1.8 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 11.29 88 age of intrusion 470 1 13.6 0.4 hornblende conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.643 0.1264 38 age of volcanism 471 1 22.73 biotite 37Ar-41Ar total fusion 94 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 2.7 63 initial age disturbed by later metamorphism BIOTITE PLUS 2% CHLORITE. ANALYTICAL ERROR IS +3 AND -2 M.Y. 472 1 11.6 0.9 whole rock conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 1.58 0.2655 11 age of volcanism 473 1 64.91 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04*" 8.16 7.764 AGE OF MINERALIZATION 474 1 9.43 0.28 biotite conventional K-Ar W24 "4.72E-04, 0.585E-04, 1.19E-04*" 8 1.089 70 age of volcanism "7.98%, 8.02% K2O" 475 1 9.59 0.37 biotite conventional K-Ar W25-NO.1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.915 1.096 64 age of volcanism "7.91%, 7.92% K2O" 475 2 9.25 0.27 biotite conventional K-Ar W25-NO.2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.835 1.046 73 age of volcanism "7.81%, 7.86% K2O" 476 1 13.6 0.33 plagioclase conventional K-Ar W26 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4985 0.098 2939 age of volcanism "0.496%, 0.501% K2O; 0.0983 X E-10, O.0977 X E-10 MOL/GM AR-40" 477 1 11.1 0.54 plagioclase conventional K-Ar W27 "4.72E-04, 0.585E-04, 1.19E-04*" 0.1735 0.0278 16 age of intrusion "0.173%, 0.174% K2O" 478 1 14.08 0.41 whole rock conventional K-Ar W28 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5605 0.1141 72 age of volcanism "0.558%, 0.563% K2O" 479 1 9.56 0.42 whole rock conventional K-Ar W29 "4.72E-04, 0.585E-04, 1.19E-04*" 1.72 0.2374 26 age of volcanism "1.72%, 1.72% K2O" 480 1 39.33 biotite 37Ar-41Ar total fusion 145 "4.72E-04, 0.585E-04, 1.19E-04*" 4.35 2.49 61 minimum age of intrusion A MIXTURE OF BIOTITE AND HORNBLENDE WITH 5% CHLORITE. ANALYTICAL ERROR IS +6 AND -2 M.Y. 481 1 22.46 biotite 37Ar-41Ar total fusion 146 "4.72E-04, 0.585E-04, 1.19E-04*" 7.1 2.31 53 minimum age of intrusion BIOTITE PLUS 4% CHLORITE AND 5% HORNBLENDE. ANALYTICAL ERROR IS +3 AND -2 M.Y. 482 1 9 0.4 whole rock conventional K-Ar UNDER W29 "4.72E-04, 0.585E-04, 1.19E-04*" 1.995 0.2592 29 age of volcanism "1.99%, 2.00% K2O" "AGE RECALCULATED FROM DATA GIVEN IN DALRYMPLE, G.B, 1964, CALIF. UNIV. PUBL. GEOL. SCI. 47" 483 1 6.28 0.18 whole rock conventional K-Ar A1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.52 0.1377 55 age of volcanism "1.51%, 1.53% K2O" 484 1 23.97 biotite 37Ar-41Ar total fusion 161 "4.72E-04, 0.585E-04, 1.19E-04*" 5.47 1.9 36 minimum age of intrusion BIOTITE (NO CHLORITE) PLUS 5% HORNBLENDE. ANALYTICAL ERROR IS +4 AND -2 M.Y. 485 1 19.16 biotite 37Ar-41Ar total fusion 175 "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 2.46 65 minimum age of intrusion BIOTITE PLUS 1% MONTMORILLONITE. ANALYTICAL ERROR IS +3 AND -2 M.Y. 486 1 127.62 biotite 37Ar-41Ar total fusion 180 "4.72E-04, 0.585E-04, 1.19E-04*" 5.41 10.3 19 age meaning uncertain (geologic factors) BIOTITE PLUS 30% CHLORITE. ANALYTICAL ERROR IS +19 AND-6 M.Y. 486 2 107.29 biotite 37Ar-41Ar total fusion 180 "4.72E-04, 0.585E-04, 1.19E-04*" 5.41 8.61 35 age meaning uncertain (geologic factors) BIOTITE PLUS 30% CHLORITE. ANALYTICAL ERROR IS +16 AND -5 M.Y. 487 1 4.25 0.12 whole rock conventional K-Ar A2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.085 0.0664 45 age of volcanism "1.08%, 1.09% K2O" 488 1 50.14 biotite 37Ar-41Ar total fusion 206 "4.72E-04, 0.585E-04, 1.19E-04*" 6.83 5 24 minimum age of intrusion BIOTITE (NO CHLORITE) PLUS 15% HORNBLENDE. ANALYTICAL ERROR IS +7 AND -2 M.Y. 488 2 40.82 biotite 37Ar-41Ar total fusion 206 "4.72E-04, 0.585E-04, 1.19E-04*" 6.83 4.06 71 age not evaluated BIOTITE (NO CHLORITE) PLUS 15% HORNBLENDE. ANALYTICAL ERROR IS +6 AND -2 M.Y. 489 1 4.14 0.12 whole rock conventional K-Ar A3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.975 0.0582 42 age of volcanism "0.973%, 0.977% K2O" 492 1 2303 60 biotite conventional K-Ar GMYB-5 "4.8E-04, 0.58E-04*" 7.64 512.9 92 Giletti (1968) minimum age of intrusion SMALL BOOKS OF BIOTITE INTERGROWN WITH PLAGIOCLASE; MINOR CHLORITIZATION LISTED DATA ARE AVERAGES OF REPLICATE DETERMINATIONS DISPARITY WITH RB-SR AGE PROBABLY DUE TO ARGON LOSS DURING ALTERATION 493 1 278 14 feldspar conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 12.43 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 493 2 332 17 mica grop conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 10.47 minimum age of intrusion PROBABLY MUSCOVITE 494 1 231 12 microcline conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 13.01 MICROCLINE DOES NOT QUANTITATIVELY RETAIN ARGON 494 2 242 12 microcline conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 13.01 MICROCLINE DOES NOT QUANTITATIVELY RETAIN ARGON 494 3 329 16 mica grop conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 9.93 age not evaluated PROBABLY MUSCOVITE 494 4 346 17 mica grop conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 9.93 minimum age of intrusion PROBABLY MUSCOVITE) 495 1 248 12 feldspar conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 12.72 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 495 2 338 17 mica grop conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 10.81 minimum age of intrusion PROBABLY MUSCOVITE 496 1 290 14 feldspar conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 13.97 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 496 2 293 15 feldspar conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 13.97 PROBABLY MICROCLINE ANALYZED MATERIAL DOES NOT QUANTITATIVELY RETAIN ARGON 497 1 402 20 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 4.2 initial age disturbed by later metamorphism 498 1 378 19 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 5.26 initial age disturbed by later metamorphism 499 1 378 19 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 2.78 initial age disturbed by later metamorphism 500 1 368 18 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 1.63 initial age disturbed by later metamorphism 501 1 260 13 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 5.91 initial age disturbed by later metamorphism 502 1 413 21 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 4.78 initial age disturbed by later metamorphism 502 2 394 20 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 4.78 initial age disturbed by later metamorphism 503 1 287 14 feldspar conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 12.95 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 503 2 296 15 feldspar conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 12.95 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 503 3 555 28 mica grop conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 3.75 minimum age of intrusion 503 4 535 26 mica grop conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 3.75 minimum age of intrusion 504 1 535 27 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 5.16 minimum age of intrusion MAINLY FELDSPAR AND QUARTZ 505 1 535 27 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 8.9 minimum age of intrusion PROBABLY FELDSPAR 506 1 1110 56 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 1.58 age of metamorphic crystallization 507 1 655 33 whole rock conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 4.89 age meaning uncertain (geologic factors) PROBABLY FELDSPAR AND QUARTZ 508 1 1360 68 lepidolite conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 9.93 minimum age of intrusion 508 2 1390 70 lepidolite conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 9.93 minimum age of intrusion 508 3 980 49 microcline conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 14.24 MICROCLINE DOES NOT QUANTITATIVELY RETAIN ARGON 509 1 1430 72 microcline conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 11.4 MICROCLINE DOES NOT QUANTITATIVELY RETAIN ARGON 510 1 835 42 feldspar conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 12.48 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 510 2 855 43 feldspar conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 12.48 PROBABLY MICROCLINE ANALYZED MINERAL DOES NOT QUANTITATIVELY RETAIN ARGON 510 3 1360 68 lepidolite conventional K-Ar (NOT GIVEN) "4.76E-04, 0.586E-04" 9.3 minimum age of intrusion 511 1 95.7 sanidine conventional K-Ar (NOT GIVEN) no decay constants given* age of volcanism NO ANALYTICAL DATA GIVEN; CALCULATED AGE IS THE AVERAGE OF 95.3 AND 96.1 M.Y. 512 1 61 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism SEE RECORD 511 FOR DECAY CONSTANTS 512 2 62.7 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism 513 1 1010 whole rock conventional K-Ar BT-1 no decay constants given Baadsgaard and Mueller (1973) initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN SAMPLE TAKEN WITHIN A FEW METERS OF TERTIARY STOCK 514 1 1500 whole rock conventional K-Ar BT-8 no decay constants given Baadsgaard and Mueller (1973) age of intrusion NO ANALYTICAL DATA GIVEN 515 1 128 4 biotite conventional K-Ar KA81 "4.72E-04, 0.584E-04, 1.19E-04" 7.53 91 Curtis and others (1958) age of intrusion 516 1 136 4 biotite conventional K-Ar KA-97 "4.72E-04, 0.584E-04, 1.19E-04" 8.48 94 Curtis and others (1958) age of intrusion 517 1 10.7 0.3 biotite conventional K-Ar KA-132 "4.72E-04, 0.584E-04, 1.19E-04" 7.37 34 age of volcanism 518 1 15.2 0.5 biotite conventional K-Ar KA 161 "4.72E-04, 0.584E-04, 1.19E-04" 5.06 9 Evernden and others (1964) age of volcanism 519 1 32 1 biotite conventional K-Ar KA-175 "4.72E-04, 0.584E-04, 1.19E-04" 7.69 50 age of volcanism 520 1 59 2 biotite conventional K-Ar KA-176 "4.72E-04, 0.584E-04, 1.19E-04" 3.05 47 age of volcanism 521 1 81 2 biotite conventional K-Ar KA-177 "4.72E-04, 0.584E-04, 1.19E-04" 8.38 89 "sample contains excess radiogenic argon, age is too old" 522 1 96 3 biotite conventional K-Ar KA-404 "4.72E-04, 0.584E-04, 1.19E-04" 7.41 91 Curtis and others (1958) age of volcanism 523 1 12 0.4 biotite conventional K-Ar KA-414 "4.72E-04, 0.584E-04, 1.19E-04" 7.67 44 Evernden and others (1964) age of volcanism 524 1 15.2 0.5 biotite conventional K-Ar KA-449 "4.72E-04, 0.584E-04, 1.19E-04" 5.82 60 Evernden and others (1964) age of volcanism 525 1 169 5 biotite conventional K-Ar KA-431 "4.72E-04, 0.584E-04, 1.19E-04" 4.37 81 age of intrusion A BIOTITE-HORNBLENDE CONCENTRATE "LOW POTASSIUM VALUE DUE TO PRESENCE OF HORNBLENDE IN SAMPLE, NOT TO CHLORITIZED MICA" 526 1 33.1 1 sanidine conventional K-Ar KA-483 "4.72E-04, 0.584E-04, 1.19E-04" 5.7 79 Evernden and others (1964) age of volcanism 527 1 421 12 biotite conventional K-Ar KA-462 "4.72E-04, 0.584E-04, 1.19E-04" 7.51 77 age of volcanism "H. FAUL, DONOR OF THE BIOTITE SEPARATE, OBTAINED A K-AR AGE OF 420 M.Y. FOR THIS SAMPLE" 528 1 31.5 0.9 glauconite conventional K-Ar KA-147 "4.72E-04, 0.584E-04, 1.19E-04" 6.55 51 "AGE TOO YOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 529 1 70 2 glauconite conventional K-Ar KA-152 "4.72E-04, 0.584E-04, 1.19E-04" 5.31 35 age of volcanism 529 2 69 2 glauconite conventional K-Ar KA-152 "4.72E-04, 0.584E-04, 1.19E-04" 6.67 73 age of volcanism 530 1 70 2 glauconite conventional K-Ar KA-152 "4.72E-04, 0.584E-04, 1.19E-04" 5.31 35 age of volcanism 530 2 69 2 glauconite conventional K-Ar KA-152 "4.72E-04, 0.584E-04, 1.19E-04" 6.67 73 age of volcanism 531 1 42 1 glauconite conventional K-Ar KA-153 "4.72E-04, 0.584E-04, 1.19E-04" 7.01 82 minimum age of volcanism 532 1 36 1 glauconite conventional K-Ar KA-154 "4.72E-04, 0.584E-04, 1.19E-04" 6.02 42 "AGE IS TOO YOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 533 1 25 1 glauconite conventional K-Ar KA-160 "4.72E-04, 0.584E-04, 1.19E-04" 6.48 48 "AGE IS TOOYOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 534 1 38 1 glauconite conventional K-Ar KA-162 "4.72E-04, 0.584E-04, 1.19E-04" 5.58 75 AGE IS TOO YOUNG 535 1 39 1 glauconite conventional K-Ar KA-165 "4.72E-04, 0.584E-04, 1.19E-04" 7.49 73 AGE IS TOO YOUNG 536 1 39 1 glauconite conventional K-Ar KA-166 "4.72E-04, 0.584E-04, 1.19E-04" 4.64 61 AGE IS TOO YOUNG 537 1 39 1 glauconite conventional K-Ar KA-166 "4.72E-04, 0.584E-04, 1.19E-04" 4.64 61 AGE IS TOO YOUNG 538 1 46 1 glauconite conventional K-Ar KA-170 "4.72E-04, 0.584E-04, 1.19E-04" 4.64 53 "AGE IS TOO YOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 539 1 23 glauconite conventional K-Ar KA-171 "4.72E-04, 0.584E-04, 1.19E-04" 6.13 34 minimum age of volcanism 540 1 58 2 glauconite conventional K-Ar KA-172 "4.72E-04, 0.584E-04, 1.19E-04" 4.76 61 age of volcanism 541 1 46 1 glauconite conventional K-Ar KA-178 "4.72E-04, 0.584E-04, 1.19E-04" 5.95 30 "AGE IS TOO YOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 542 1 43 1 glauconite conventional K-Ar KA-189 "4.72E-04, 0.584E-04, 1.19E-04" 6.53 63 age of volcanism 543 1 5.2 0.2 glauconite conventional K-Ar KA-192 "4.72E-04, 0.584E-04, 1.19E-04" 6.02 7 age of volcanism 544 1 246 7 whole rock conventional K-Ar KA-262 "4.72E-04, 0.584E-04, 1.19E-04" 6.11 68 age meaning uncertain (analysis questionable and geologic factors 545 1 27 1 glauconite conventional K-Ar KA-265 "4.72E-04, 0.584E-04, 1.19E-04" 6.22 67 "AGE IS TOO YOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 546 1 18 1 glauconite conventional K-Ar KA-267 "4.72E-04, 0.584E-04, 1.19E-04" 6.3 55 "AGE IS TOO YOUNG, PROBABLY DUE TO DIAGENETIC AND/OR GEOTHERMAL FACTORS" 547 1 33 1 glauconite conventional K-Ar KA-285 "4.72E-04, 0.584E-04, 1.19E-04" 5.51 61 "AGE IS TOO YOUNG, PROBABLY DUE TO GEOTHERMAL AND/OR DIAGENETIC FACTORS" 548 1 295 9 whole rock conventional K-Ar KA-337 "4.72E-04, 0.584E-04, 1.19E-04" 3.45 68 age of volcanism 549 1 305 9 whole rock conventional K-Ar KA-338 "4.72E-04, 0.584E-04, 1.19E-04" 2.48 66 AGE IS TOO YOUNG. 550 1 363 11 whole rock conventional K-Ar KA-339 "4.72E-04, 0.584E-04, 1.19E-04" 6.38 72 AGE IS TOO YOUNG 551 1 347 10 whole rock conventional K-Ar KA-340 "4.72E-04, 0.584E-04, 1.19E-04" 5.05 72 AGE IS TOO YOUNG 552 1 284 9 whole rock conventional K-Ar KA-341 "4.72E-04, 0.584E-04, 1.19E-04" 6.79 63 AGE IS TOO YOUNG 553 1 267 8 whole rock conventional K-Ar KA-342 "4.72E-04, 0.584E-04, 1.19E-04" 6.83 47 AGE IS TOO YOUNG 554 1 485 15 whole rock conventional K-Ar KA-343 "4.72E-04, 0.584E-04, 1.19E-04" 3.36 46 "sample contains inherited material, age is too old" 554 2 490 15 illite conventional K-Ar KA-343A "4.72E-04, 0.584E-04, 1.19E-04" 3.4 77 "sample contains inherited material, age is too old" MATERIAL LESS THAT 74 MICRON DIAMETER WAS ANALYZED 555 1 457 14 whole rock conventional K-Ar KA-344 "4.72E-04, 0.584E-04, 1.19E-04" 7.04 87 AGE IS TOO YOUNG 556 1 52 2 glauconite conventional K-Ar KA-438 "4.72E-04, 0.584E-04, 1.19E-04" 5.37 77 age of volcanism 557 1 52 2 glauconite conventional K-Ar KA-438 "4.72E-04, 0.584E-04, 1.19E-04" 5.37 77 age of volcanism 558 1 340.77 17 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 10.75 58.05 97 minimum age of intrusion "FRESH, OBTAINED WHERE NO URANINITE OCCURS" 559 1 1552.1 80 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 10.1 357.8 99 age of intrusion 559 2 1388.74 70 lepidolite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.97 300.2 98 minimum age of intrusion 560 1 1302.75 65 lepidolite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.28 255.2 98 age not evaluated VALUES SHOWN ARE AVERAGE OF 5 ANALYSES 561 1 1257.52 60 muscovite conventional K-Ar C "4.72E-04, 0.585E-04, 1.19E-04*" 10.8 282.7 100 age not evaluated 561 2 1267.37 60 muscovite conventional K-Ar D "4.72E-04, 0.585E-04, 1.19E-04*" 10.4 275.2 100 age not evaluated 562 1 1368.79 70 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 10.86 320.3 99 minimum age of intrusion PRIMARY 563 1 1291.85 60 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.39 255.2 69 minimum age of intrusion BIOTITE SLIGHTLY LEACHED AND CONTAINS ROD-LIKE INCLUSIONS 564 1 1066.76 50 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 4.42 92.57 94 minimum age of intrusion NOT CHLORITIZED 565 1 984.82 50 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 6.58 124.1 95 minimum age of intrusion 566 1 178.39 8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.62 20.57 95 age not evaluated 567 1 140.02 7 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 16.56 84 age not evaluated "RAGGED GRAINS, PARTIALLY CHLORITIZED, BUT GOOD SAMPLE OBTAINED BY MAGNETIC SEPARATION" 568 1 469.19 20 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 4.8 37.03 81 minimum age of intrusion 570 1 2237.43 110 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.53 608 99 age not evaluated PURPLE 571 1 1387.11 70 lepidolite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 10.07 302.7 99 minimum age of intrusion 572 1 1125.99 60 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 10.76 242.2 99 age not evaluated PURPLE 573 1 1289.97 60 lepidolite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.87 267.7 94 age not evaluated 574 1 91.57 4 lepidolite conventional K-Ar A170 "4.72E-04, 0.585E-04, 1.19E-04*" 10.36 14.01 86 minimum age of intrusion 575 1 1303.13 65 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 243.2 97 age of intrusion 576 1 1310.18 65 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 226.2 99 age of intrusion 577 1 1344.09 70 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.33 239.4 97 age of intrusion BIOTITE IS CURVED AND HAS A RUSTY APPEARANCE 578 1 1175.15 60 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04*" 9.38 223.7 95 minimum age of intrusion MODERATELY CHLORITIZED 578 2 1218.19 60 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.8 195.4 92 minimum age of intrusion 579 1 1066.11 50 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.34 153.6 98 age of intrusion PARTIALLY CHLORITIZED 580 1 676.05 35 biotite conventional K-Ar ND1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.48 88.32 initial age disturbed by weathering RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 581 1 1750.03 85 biotite conventional K-Ar ND4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 376.1 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 585 1 1650.94 80 muscovite conventional K-Ar SD4 "4.72E-04, 0.585E-04, 1.19E-04*" 9.94 386.5 age of intrusion RADIOGENIC ARGON WAS BETWEEN 85-100% 586 1 1687.42 85 muscovite conventional K-Ar SD5 "4.72E-04, 0.585E-04, 1.19E-04*" 10.08 405.3 age of intrusion RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 589 1 1467.02 75 whole rock conventional K-Ar SD9 "4.72E-04, 0.585E-04, 1.19E-04*" 2.41 78.56 "minimum age of metamorphic crystallization, initial age disturbed by later metamorphism" RADIOGENIC ARGON WAS BETWEEN 85-100% RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 593 1 2392.28 120 biotite conventional K-Ar SD13 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 580.5 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 597 1 1687.45 85 whole rock conventional K-Ar SD17 "4.72E-04, 0.585E-04, 1.19E-04*" 3.82 153.6 age of intrusion RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 600 1 1401.34 70 biotite conventional K-Ar CO2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 272.7 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 604 1 1376.5 70 biotite conventional K-Ar NR1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 276.5 initial age disturbed by later metamorphism 605 1 1192.05 60 whole rock conventional K-Ar NR3 "4.72E-04, 0.585E-04, 1.19E-04*" 3.56 86.57 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 607 1 1229 60 whole rock conventional K-Ar NR5 "4.72E-04, 0.585E-04, 1.19E-04*" 2.96 75.06 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 611 1 891.17 45 biotite conventional K-Ar NR9 "4.72E-04, 0.585E-04, 1.19E-04*" 2.82 46.79 initial age disturbed by weathering RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 612 1 996.41 50 whole rock conventional K-Ar NR10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.49 9.383 age not evaluated RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 613 1 1185.2 60 biotite conventional K-Ar NR12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.99 216.9 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 615 1 1183.28 60 biotite conventional K-Ar NR14 "4.72E-04, 0.585E-04, 1.19E-04*" 8.96 215.7 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 616 1 1314 65 whole rock conventional K-Ar NR15 "4.72E-04, 0.585E-04, 1.19E-04*" 1.51 42.03 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 617 1 1291.39 65 whole rock conventional K-Ar NR16 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7 19.015 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 618 1 1287.04 65 whole rock conventional K-Ar NR17 "4.72E-04, 0.585E-04, 1.19E-04*" 2.48 67.05 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 619 1 1186.67 60 biotite conventional K-Ar NR18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.83 213.4 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 620 1 672.23 35 whole rock conventional K-Ar NR19 "4.72E-04, 0.585E-04, 1.19E-04*" 2.24 26.27 age not evaluated RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 622 1 1363.46 70 biotite conventional K-Ar NR22 "4.72E-04, 0.585E-04, 1.19E-04*" 5.97 175.1 age not evaluated RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 626 1 993.57 50 whole rock conventional K-Ar NR26 "4.72E-04, 0.585E-04, 1.19E-04*" 0.32 6.105 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 627 1 1170.13 60 biotite conventional K-Ar NR27 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 207.7 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 628 1 1166.46 60 biotite conventional K-Ar WI1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 205.4 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 631 1 1424.62 70 muscovite conventional K-Ar WI4 "4.72E-04, 0.585E-04, 1.19E-04*" 10.51 328.3 age meaning uncertain (geologic factors) RADIOGENIC ARGON WAS BETWEEN 85 AND 100% 632 1 1510.49 75 biotite conventional K-Ar MO1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.34 317.8 minimum age of intrusion RADIOGENIC-ARGON WAS BETWEEN 69-99% RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 634 1 1244.69 60 whole rock conventional K-Ar MO3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.91 49.29 "minimum age of intrusion, initial age disturbed by later metamorphism" RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 635 1 1403.24 70 muscovite conventional K-Ar MO4 "4.72E-04, 0.585E-04, 1.19E-04*" 10.48 320.3 minimum age of intrusion RADIOGONIC ARGON WAS BETWEEN 69 AND 99% 636 1 1416.07 70 biotite conventional K-Ar MO5 "4.72E-04, 0.585E-04, 1.19E-04*" 9.21 285.2 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 641 1 1244.04 60 biotite conventional K-Ar MO10 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 235.7 minimum age of intrusion RADIOGENIC-ARGON WAS BETWEEN 69 AND 99% 642 1 1265.54 60 muscovite conventional K-Ar MO11 "4.72E-04, 0.585E-04, 1.19E-04*" 10.97 289.7 age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 647 1 1340.62 65 biotite conventional K-Ar MO16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 247.4 age not evaluated RADIOGENIC ARGON WAS BETWEEN 69 AND 99%. 648 1 1284.73 65 biotite conventional K-Ar MO17 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 238.4 age not evaluated RADIOGENIC ARGON WAS BETWEEN 69 AND 99%. 649 1 1360.25 70 muscovite conventional K-Ar MO18 "4.72E-04, 0.585E-04, 1.19E-04*" 10.28 300.5 age not evaluated RADIOGENIC ARGON WAS BETWEEN 69 AND 99%. 650 1 1092.56 60 whole rock conventional K-Ar KA1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.47 31.78 RADIOGENIC ARGON WAS BETWEEN 69 AND 99%. 654 1 1211.83 60 biotite conventional K-Ar KA5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 203.7 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 663 1 1261.99 65 whole rock conventional K-Ar KA21 "4.72E-04, 0.585E-04, 1.19E-04*" 0.37 9.733 age not evaluated RADIOGENIC ARGON WAS BETWEEN 69 AND 99%. 691 1 508.33 25 biotite conventional K-Ar OK20 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 74.56 age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 693 1 1240.98 60 hornblende conventional K-Ar TX2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7 17.99 RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 698 1 1209.58 60 plagioclase conventional K-Ar TX9 "4.72E-04, 0.585E-04, 1.19E-04*" 0.12 2.977 age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 701 1 1010 50 biotite conventional K-Ar TX15 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 160.6 age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 704 1 371.75 20 biotite conventional K-Ar TX22 "4.72E-04, 0.585E-04, 1.19E-04*" 7.24 43.03 age not evaluated RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 707 1 1332.94 65 muscovite conventional K-Ar NM2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.95 254.2 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 708 1 1357.2 70 biotite conventional K-Ar NM3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.5 189.4 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 710 1 1357.65 70 biotite conventional K-Ar NM5 "4.72E-04, 0.585E-04, 1.19E-04*" 6.84 199.4 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 711 1 1376.15 70 muscovite conventional K-Ar NM6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 265.7 age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 713 1 1406.69 70 biotite conventional K-Ar NM8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 274.2 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 715 1 1376.55 70 biotite conventional K-Ar NM10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 267 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 716 1 1386.7 70 biotite conventional K-Ar NM11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 256 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 718 1 1348.29 65 muscovite conventional K-Ar NM15 "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 249.7 age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 720 1 1196.55 60 biotite conventional K-Ar NM19 "4.72E-04, 0.585E-04, 1.19E-04*" 7.72 188.7 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 725 1 1275.78 65 biotite conventional K-Ar CO9 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 245.7 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 729 1 1374.15 70 biotite conventional K-Ar UT2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 243.2 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 730 1 297.77 15 biotite conventional K-Ar AL1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.91 41.53 age not evaluated RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 731 1 491.02 25 whole rock conventional K-Ar FL1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.93 7.556 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 69 AND 99% 734 1 997.27 50 biotite conventional K-Ar IA3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 166.4 initial age disturbed by later metamorphism RADIOGENIC ARGON WAS BETWEEN 93 AND 99% REHEATED BY KEWEENAWAN IGNEOUS ACTIVITY 735 1 736.33 35 biotite conventional K-Ar IA4 "4.72E-04, 0.585E-04, 1.19E-04*" 6.25 81.82 "age meaning uncertain (geologic factors), initial age disturbed by later metamorphism" RADIOGENIC ARGON WAS BETWEEN 93 AAD 99% REHEATED BY KEWEENAWAN IGNEOUS ACTIVITY 736 1 1296.22 65 biotite conventional K-Ar IA5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 233.2 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 737 1 1416 70 biotite conventional K-Ar IA6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.57 234.4 age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AAD 99% 738 1 1291.8 65 biotite conventional K-Ar IA7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.42 256 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 739 1 1295.54 65 muscovite conventional K-Ar IA8 "4.72E-04, 0.585E-04, 1.19E-04*" 9.84 268.5 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 739 2 1226.8 60 biotite conventional K-Ar IA8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.97 226.9 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 741 1 1385.53 70 biotite conventional K-Ar IL1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.27 278.2 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 742 1 1215.59 60 biotite conventional K-Ar IL2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.77 169.1 age not evaluated RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 743 1 654.67 30 biotite conventional K-Ar IL3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 76.81 age meaning uncertain (geologic factors) RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 745 1 1307.73 65 biotite conventional K-Ar IL5 "4.72E-04, 0.585E-04, 1.19E-04*" 7.61 210.4 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 746 1 1404.11 70 biotite conventional K-Ar IL6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 274.7 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 747 1 1354.69 70 biotite conventional K-Ar IL7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 244.7 minimum age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99%. 752 1 1102.27 55 biotite conventional K-Ar MI1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.57 165.6 age of intrusion RADIOGENIC ARGON WAS BETWEEN 93 AND 99% PROBABLY EQUIVALENT TO DULUTH GABBRO COMPLEX 753 1 985.16 50 biotite conventional K-Ar MI2 "4.72E-04, 0.585E-04, 1.19E-04*" 9.28 175.1 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 756 1 974.58 50 biotite conventional K-Ar OH1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.97 166.9 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 757 1 947.6 45 biotite conventional K-Ar OM2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 155.4 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 758 1 947.52 45 biotite conventional K-Ar OH3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 143.9 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 762 1 954.72 45 biotite conventional K-Ar OH8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.45 153.1 age of metamorphic crystallization BIOTITE FROM 4190-4215 FOOT INTERVAL RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 762 2 893.4 45 muscovite conventional K-Ar OH8 "4.72E-04, 0.585E-04, 1.19E-04*" 10.73 178.6 minimum age of metamorphic crystallization MUSCOVITE FROM 4190-4210 AND 4280-4285 FOOT INTERVALS RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 763 1 989.3 50 biotite conventional K-Ar OH9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.07 153.1 age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 763 2 942.8 45 muscovite conventional K-Ar OH9 "4.72E-04, 0.585E-04, 1.19E-04*" 9.99 178.1 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 764 1 999 50 biotite conventional K-Ar OH10 "4.72E-04, 0.585E-04, 1.19E-04*" 7.76 149.1 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 765 1 864.19 45 biotite conventional K-Ar WV1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 144.6 minimum age of metamorphic crystallization RADIOGENIC ARGON WAS BETWEEN 93 AND 99% 766 1 75.14 biotite conventional K-Ar KA-137 "4.72E-04, 0.577E-04*" 8.5 9.39 64 Evernden and others (1957) age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 767 1 81.4 biotite conventional K-Ar KA-177 "4.72E-04, 0.577E-04*" 8.2 9.83 53 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 768 1 80.27 biotite conventional K-Ar KA-133 "4.72E-04, 0.577E-04*" 7.1 8.39 59 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 769 1 81.92 biotite conventional K-Ar KA-135 "4.72E-04, 0.577E-04*" 6.73 8.12 37 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 770 1 82.14 biotite conventional K-Ar KA-73 "4.72E-04, 0.577E-04*" 7.72 9.34 62 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 771 1 85.36 biotite conventional K-Ar KA-100 "4.72E-04, 0.577E-04*" 9.79 12.32 79 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 772 1 86.38 biotite conventional K-Ar KA-68 "4.72E-04, 0.577E-04*" 7.96 10.14 91 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 773 1 89.98 biotite conventional K-Ar KA-72 "4.72E-04, 0.577E-04*" 9.14 12.14 83 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 774 1 90.65 biotite conventional K-Ar KA-71 "4.72E-04, 0.577E-04*" 9.1 12.18 92 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 775 1 93.04 biotite conventional K-Ar KA-67 "4.72E-04, 0.577E-04*" 8.54 11.74 87 Evernden and others (1957) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 776 1 82.23 biotite conventional K-Ar KA-185 "4.72E-04, 0.577E-04*" 6.53 7.91 64 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 777 1 81.88 biotite conventional K-Ar KA-184 "4.72E-04, 0.577E-04*" 7.96 9.6 92 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 778 1 81.6 biotite conventional K-Ar KA-94 "4.72E-04, 0.577E-04" 8.91 9.6 44 age of intrusion (*) AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 779 1 90.04 biotite conventional K-Ar KA-92 "4.72E-04, 0.577E-04*" 6.41 8.52 35 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 780 1 139.59 biotite conventional K-Ar KA-120 "4.72E-04, 0.577E-04*" 8.38 17.51 89 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 781 1 127.41 muscovite conventional K-Ar KA-102 "4.72E-04, 0.577E-04*" 9.36 17.79 67 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 781 2 128.2 biotite conventional K-Ar KA-103 "4.72E-04, 0.577E-04*" 7.58 14.5 87 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 782 1 131.22 biotite conventional K-Ar KA-98 "4.72E-04, 0.577E-04*" 7.43 14.56 84 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 783 1 81.33 biotite conventional K-Ar KA-93 "4.72E-04, 0.577E-04*" 7.99 9.57 70 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 784 1 88.38 biotite conventional K-Ar KA-78 "4.72E-04, 0.577E-04*" 3.42 4.46 37 "DETRITAL BIOTITE, PROBABLY CHLORITIC" AGE IS MEAN AGE OF SOURCE ROCKS FOR THE SEDIMENTS. AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 785 1 103.81 biotite conventional K-Ar KA-204 "4.72E-04, 0.577E-04*" 2.6 4 55 "DETRITAL BIOTITE, PROBABLY CHLORITIC" AGE IS MEAN AGE OF SOURCE ROCKS FOR THE SEDIMENTS. AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 786 1 140.82 12 biotite conventional K-Ar KA-199 "4.72E-04, 0.577E-04*" 1.75 3.69 56 "DETRITAL BIOTITE, PROBABLY CHLORITIC" AGE IS MEAN AGE OF SOURCE ROCKS FOR THE SEDIMENTS. AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 787 1 88.27 biotite conventional K-Ar KA-74 "4.72E-04, 0.577E-04*" 7.01 9.13 84 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 788 1 139.22 biotite conventional K-Ar KA-97 "4.72E-04, 0.577E-04*" 8.48 17.67 94 Curtis and others (1958) age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 789 1 130.49 biotite conventional K-Ar KA-81 "4.72E-04, 0.577E-04*" 7.53 14.67 92 Evernden and others (1961) age of intrusion BIOTITE SOMEWHAT CHLORITIZED AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 790 1 75.14 1.5 biotite conventional K-Ar KA-137 "4.72E-04, 0.577E-04*" 8.5 9.39 64 Curtis and others (1958) age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 791 1 81.4 1.7 biotite conventional K-Ar KA-177 "4.72E-04, 0.577E-04*" 8.2 9.83 53 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 792 1 80.27 1.6 biotite conventional K-Ar KA-133 "4.72E-04, 0.577E-04*" 7.1 8.39 59 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 793 1 81.92 1.7 biotite conventional K-Ar KA-135 "4.72E-04, 0.577E-04*" 6.73 8.12 37 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 794 1 82.14 1.7 biotite conventional K-Ar KA-73 "4.72E-04, 0.577E-04*" 7.72 9.34 62 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 794 2 81.97 1.7 biotite conventional K-Ar KA-73R "4.72E-04, 0.577E-04*" 7.71 9.309 68 age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 795 1 85.36 1.7 biotite conventional K-Ar KA-100 "4.72E-04, 0.577E-04*" 9.79 12.32 79 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 796 1 86.38 1.7 biotite conventional K-Ar KA-68 "4.72E-04, 0.577E-04*" 7.96 10.14 91 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 797 1 89.98 1.8 biotite conventional K-Ar KA-72 "4.72E-04, 0.577E-04*" 9.14 12.14 83 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 798 1 90.65 1.9 biotite conventional K-Ar KA-71 "4.72E-04, 0.577E-04*" 9.1 12.18 92 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 799 1 93.04 1.9 biotite conventional K-Ar KA-67 "4.72E-04, 0.577E-04*" 8.54 11.74 87 Curtis and others (1958) age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 800 1 83.06 1.7 biotite conventional K-Ar KA-149 "4.72E-04, 0.577E-04*" 8.02 9.815 87 age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 801 1 77.39 1.7 biotite conventional K-Ar KA-155 "4.72E-04, 0.577E-04*" 8.48 9.654 78 age not evaluated AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 802 1 1.52 0.24 biotite conventional K-Ar KA-101 "4.72E-04, 0.577E-04*" 4.87 0.1066 5 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 803 1 1.64 0.1 biotite conventional K-Ar KA-65 "4.72E-04, 0.577E-04*" 7.96 0.1884 21 age of intrusion AGE CALCULATED WITH OBSOLETE DECAY CONSTANTS FOR POTASSIUM-40 808 1 63.88 1.9 biotite conventional K-Ar L-843 "4.72E-04, 0.585E-04, 1.19E-04*" 4.23 3.96 82 age of intrusion "ANALYZED SEPARATE WAS 95% BIOTITE, 5% CHLORITE, QUARTZ, AND FELDSPAR" POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 808 2 65.15 1.9 biotite conventional K-Ar L-843 "4.72E-04, 0.585E-04, 1.19E-04*" 4.23 4.04 78 age of intrusion "ANALYZED SEPARATE WAS 95% BIOTITE, 5% CHLORITE, QUARTZ, AND FELDSPAR" POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 808 3 63.56 1.9 biotite conventional K-Ar L-843 "4.72E-04, 0.585E-04, 1.19E-04*" 4.23 3.94 78 age of intrusion "ANALYZED SEPARATE WAS 95% BIOTITE, 5% CHLORITE, QUARTZ, AND FELDSPAR" POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 809 1 19.6 1.3 biotite conventional K-Ar L-844 "4.72E-04, 0.585E-04, 1.19E-04*" 5.71 1.62 21 BIOTITE PLUS 12% CHLORITE AND 5% HORNBLENDE AGE MAY INDICATE TIME OF ALTERATION 809 2 20.07 3.5 hornblende conventional K-Ar L-844 "4.72E-04, 0.585E-04, 1.19E-04*" 0.475 0.138 9 "HORNBLENDE PLUS 4% CHLORITE, BIOTITE, AND EPIDOTE" AGE MAY INDICATE TIME OF ALTERATION 810 1 58.83 1.7 biotite conventional K-Ar L-846 "4.72E-04, 0.585E-04, 1.19E-04*" 8.41 7.24 90 age of intrusion BIOTITE PLUS 2% IMPURITIES 811 1 60.81 1.8 biotite conventional K-Ar L-850 "4.72E-04, 0.585E-04, 1.19E-04*" 8.49 7.56 94 age of intrusion 100% BIOTITE SEPARATE 812 1 62.94 2.3 hornblende conventional K-Ar L-847 "4.72E-04, 0.585E-04, 1.19E-04*" 0.475 0.438 33 age of intrusion ANALYZED SEPARATE CONTAINED 10% CHLORITE AND OTHER IMPURITIES POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 812 2 64.63 6.3 hornblende conventional K-Ar L-847 "4.72E-04, 0.585E-04, 1.19E-04*" 0.475 0.45 15 age of intrusion ANALYZED SEPARATE CONTAINED 10% CHLORITE AND OTHER IMPURITIES POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 813 1 56.5 1.7 biotite conventional K-Ar L-976 "4.72E-04, 0.585E-04, 1.19E-04*" 7.54 6.23 86 age of intrusion ANALYZED SEPARATE CONTAINED 5% CHLORITE 814 1 24.76 0.8 hornblende conventional K-Ar L-942 "4.72E-04, 0.585E-04, 1.19E-04*" 1.07 0.384 40 age of intrusion "ANALYZED SEPARATE CONTAINED 12% CHLORITE, 5% BIOTITE AND OTHER IMPURITIES" 815 1 27.09 0.8 biotite conventional K-Ar L-1126 "4.72E-04, 0.585E-04, 1.19E-04*" 8.17 3.21 69 age of intrusion SAMPLE IS 100% BIOTITE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 816 1 25.92 0.8 biotite conventional K-Ar L-1036 "4.72E-04, 0.585E-04, 1.19E-04*" 5.72 2.15 55 age of intrusion 80-100 MESH ANALYZED SEPARATE CONTAINED 40% CHLORITE 817 1 122.01 4 hornblende conventional K-Ar L-1037 "4.72E-04, 0.585E-04, 1.19E-04*" 1.04 1.89 88 age meaning uncertain (geologic factors) ANALYZED SEPARATE CONTAINS ABOUT 40% CHLORITE 818 1 34.19 1 aegerine (acmite) conventional K-Ar L-945 "4.72E-04, 0.585E-04, 1.19E-04*" 0.664 0.33 56 age of intrusion ANALYZED SEPARATE CONTAINED 2% BIOTITE AND OTHER IMPURITIES 818 2 34.5 1.3 aegerine (acmite) conventional K-Ar L-945 "4.72E-04, 0.585E-04, 1.19E-04*" 0.664 0.333 44 age of intrusion ANALYZED SEPARATE CONTAINED 2% BIOTITE AND OTHER IMPURITIES. 819 1 9.77 0.3 biotite conventional K-Ar L-1030 "4.72E-04, 0.585E-04, 1.19E-04*" 7.37 1.04 43 age of intrusion ANALYZED SEPARATE CONTAINED 10% IMPURITIES 820 1 78.61 2.3 hornblende conventional K-Ar L-1031 "4.72E-04, 0.585E-04, 1.19E-04*" 0.657 0.76 71 age meaning uncertain (analysis questionable) ANALYZED SEPARATE CONTAINED 2% EPIDOTE AND FELDSPAR "POTASSIUM DETERMINATIONS ARE 0.664, 0.640, AND 0.665% K20; AVERAGE IS 0.657% K20." 820 2 73.24 2.2 hornblende conventional K-Ar L-1031 "4.72E-04, 0.585E-04, 1.19E-04*" 0.657 0.707 56 age of intrusion ANALYZED SEPARATE CONTAINED 2% EPIDOTE AND FELDSPAR "POTASSIUM DETERMINATIONS ARE 0.664, 0.640, 0.665% K20; AVERAGE IS 0.657% K20" 821 1 39.44 1.2 biotite conventional K-Ar L-1032 "4.72E-04, 0.585E-04, 1.19E-04*" 6.55 3.76 77 age of intrusion 80-100 MESH ANALYZED SEPARATE CONTAINED 2% IMPURITIES 822 1 71.96 2.1 biotite conventional K-Ar L-1035 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 8.72 96 age of intrusion "80-100 MESH, HORNBLENDE PLUS 2% IMPURITIES (BIOTITE, ETC.)" 822 2 71.5 2.1 hornblende conventional K-Ar L-1035 "4.72E-04, 0.585E-04, 1.19E-04*" 1 1.05 86 age of intrusion 823 1 60.35 1.8 biotite conventional K-Ar L-1124 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 7.28 94 age of intrusion 60-100 MESH ANALYZED SEPARATE CONTAINED 5% IMPURITIES 824 1 66.03 1.9 biotite conventional K-Ar L-1125 "4.72E-04, 0.585E-04, 1.19E-04*" 6.94 6.72 92 age of intrusion ANALYZED SEPARATE CONTAINS 25% CHLORITE 825 1 23.28 0.7 Unk conventional K-Ar L-1039 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 2.86 79 age of intrusion "80-100 MESH, PURE BIOTITE SEPARATE" 825 2 25.05 0.7 muscovite conventional K-Ar L-1039 "4.72E-04, 0.585E-04, 1.19E-04*" 9.94 3.61 81 age of intrusion "80-100 MESH, MUSCOVITE SEPARATE WITH 2% IMPURITIES" 826 1 131.35 4 hornblende conventional K-Ar L-955 "4.72E-04, 0.585E-04, 1.19E-04*" 1.3 2.55 75 minimum age of intrusion ANALYZED SEPARATE CONTAINED 5% IMPURITIES 826 2 137.3 4 hornblende conventional K-Ar L-955 "4.72E-04, 0.585E-04, 1.19E-04*" 1.3 2.67 84 age of intrusion ANALYZED SEPARATE CONTAINED 5% IMPURITIES 827 1 51.95 1.5 biotite conventional K-Ar L-1048 "4.72E-04, 0.585E-04, 1.19E-04*" 6.84 5.19 82 age of intrusion SEPARATE CONTAINED 2% IMPURITIES 827 2 68.77 2 hornblende conventional K-Ar L-1048 "4.72E-04, 0.585E-04, 1.19E-04*" 0.875 0.883 78 "sample contains excess radiogenic argon, age is too old" SEPARATE CONTAINED 2% BIOTITE 827 3 60.73 1.8 hornblende conventional K-Ar L-1048 "4.72E-04, 0.585E-04, 1.19E-04*" 0.875 0.778 36 "sample contains excess radiogenic argon, age is too old" SEPARATE CONTAINED 2% BIOTITE 827 4 52.49 1.5 hornblende conventional K-Ar L-1048 "4.72E-04, 0.585E-04, 1.19E-04*" 0.875 0.671 60 age of intrusion SEPARATE CONTAINED 2% BIOTITE 827 5 50.72 1.5 hornblende conventional K-Ar L-1048 "4.72E-04, 0.585E-04, 1.19E-04*" 0.875 0.648 56 age of intrusion SEPARATE CONTAINED 2% BIOTITE 828 1 1310 40 hornblende conventional K-Ar L-1049 "4.72E-04, 0.585E-04, 1.19E-04*" 0.302 8.37 86 age of intrusion 80-100 MESH ANALYZED SEPARATE CONTAINED AUGITE AND CHLORITE 829 1 69.79 2 biotite conventional K-Ar L-956 "4.72E-04, 0.585E-04, 1.19E-04*" 8.59 8.8 93 age of intrusion 60-100 MESH SEPARATE OF PURE BIOTITE POTASSIUM VALUE GIVEN IN ARTICLE AS 7.13% K 829 2 67.24 2 muscovite conventional K-Ar L-956 "4.72E-04, 0.585E-04, 1.19E-04*" 10.24 10.1 71 age of intrusion 60-100 MESH SEPARATE OF PURE MUSCOVITE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES (8.49% AND 8.52% K). 829 3 69.2 2 muscovite conventional K-Ar L-956 "4.72E-04, 0.585E-04, 1.19E-04*" 10.24 10.4 89 age of intrusion 60-100 MESH SEPARATE OF PURE MUSCOVITE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES (8.49% AND 8.52% K). 830 1 74.74 2.2 biotite conventional K-Ar L-957 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 9.58 79 McDowell and Kulp (1969) age not evaluated 100% BIOTITE SEPARATE 831 1 117.69 3 biotite conventional K-Ar L-1027 "4.72E-04, 0.585E-04, 1.19E-04*" 8.11 14.2 93 McDowell and Kulp (1969) age not evaluated 80-100 MESH SEPARATE CONTAINS 25% CHLORITE 831 2 128.73 4 hornblende conventional K-Ar L-1027 "4.72E-04, 0.585E-04, 1.19E-04*" 1.14 2.19 81 McDowell and Kulp (1969) age not evaluated 80-100 MESH SEPARATE CONTAINS 5% BIOTITE AND 2% CHLORITE 831 3 124.75 4 hornblende conventional K-Ar L-1027 "4.72E-04, 0.585E-04, 1.19E-04*" 1.14 2.12 86 age not evaluated 80-100 MESH SEPARATE CONTAINS 5% BIOTITE AND 2% CHLORITE 832 1 78.58 2.3 biotite conventional K-Ar L-1028 "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 9.91 89 McDowell and Kulp (1969) age not evaluated 833 1 44.07 1.3 biotite conventional K-Ar L-1029 "4.72E-04, 0.585E-04, 1.19E-04*" 8.05 5.17 85 McDowell and Kulp (1969) age not evaluated ANALYZED SEPARATE CONTAINED 3% CHLORITE 834 1 50.36 1.5 biotite conventional K-Ar L-1121 "4.72E-04, 0.585E-04, 1.19E-04*" 8.31 6.11 87 McDowell and Kulp (1969) age not evaluated ANALYZED SEPARATE CONTAINED 10% CHLORITE 835 1 163.6 5 hornblende conventional K-Ar L-1122 "4.72E-04, 0.585E-04, 1.19E-04*" 0.434 1.07 78 McDowell and Kulp (1969) age not evaluated ANALYZED SEPARATE CONTAINED 5% IMPURITIES 835 2 154.81 7 hornblende conventional K-Ar L-1122 "4.72E-04, 0.585E-04, 1.19E-04*" 0.434 1.01 53 Zartman and Wasserburg (1969) age not evaluated ANZLYZED SEPARATE CONTAINED 5% IMPURITIES 836 1 44.62 1.3 biotite conventional K-Ar L-1123 "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 4.93 79 McDowell and Kulp (1969) age not evaluated 837 1 39.18 1.1 biotite conventional K-Ar L-953 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 4.71 84 McDowell and Kulp (1969) age not evaluated 60-100 MESH ANALYZED SEPARATE CONTAINED 15% CHLORITE 838 1 42 1.3 biotite conventional K-Ar L-954 "4.72E-04, 0.585E-04, 1.19E-04" 8.89 6 McDowell and Kulp (1969) age not evaluated 60-100 MESH ANALYZED SEPARATE CONTAINED 7% CHLORITE 839 1 63.45 1.9 biotite conventional K-Ar L-1026 "4.72E-04, 0.585E-04, 1.19E-04*" 9.54 8.87 88 McDowell and Kulp (1969) age not evaluated 80-100 MESH ANALYZED SEPARATE CONTAINED 5% QUARTZ AND FELDSPAR 839 2 60.36 1.8 biotite conventional K-Ar L-1026 "4.72E-04, 0.585E-04, 1.19E-04*" 9.54 8.43 86 McDowell and Kulp (1969) age not evaluated 80-100 MESH ANALYZED SEPARATE CONTAINED 5% QUARTZ AND FELDSPAR 840 1 56.05 1.6 muscovite conventional K-Ar L-1120 "4.72E-04, 0.585E-04, 1.19E-04*" 10.37 8.5 88 McDowell and Kulp (1969) age not evaluated ANALYZED SEPARATE CONTAINED 2% FELDSPAR 841 1 78.51 2.3 biotite conventional K-Ar L-951 "4.72E-04, 0.585E-04, 1.19E-04*" 6.89 7.96 79 Tilling and others (1968) age of intrusion ANALYZED SEPARATE CONTAINED 5% IMPURITIES 841 2 78.53 2.3 hornblende conventional K-Ar L-951 "4.72E-04, 0.585E-04, 1.19E-04*" 0.836 0.966 46 Tilling and others (1968) age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES INCLUDING BIOTITE 842 1 72.09 2.1 biotite conventional K-Ar L-952 "4.72E-04, 0.585E-04, 1.19E-04*" 7.64 8.09 87 Tilling and others (1968) age of intrusion +20 MESH BIOTITE PLUS 15% CHLORITE 842 2 71.95 2.1 biotite conventional K-Ar L-952 "4.72E-04, 0.585E-04, 1.19E-04*" 5.99 6.33 57 Tilling and others (1968) age of intrusion 80-100 MESH BIOTITE PLUS 5% HORNBLENDE 842 3 82.29 2.4 hornblende conventional K-Ar L-952 "4.72E-04, 0.585E-04, 1.19E-04*" 0.575 0.697 78 Tilling and others (1968) "sample contains excess radiogenic argon, age is too old" 80-100 MESH HORNBLENDE PLUS 2% BIOTITE 842 4 80.1 9.2 hornblende conventional K-Ar L-952 "4.72E-04, 0.585E-04, 1.19E-04*" 0.575 0.678 13 Tilling and others (1968) "sample contains excess radiogenic argon, age is too old" 80-100 MESH HORNBLENDE PLUS 2% BIOTITE 843 1 78.98 2.3 biotite conventional K-Ar L-1023 "4.72E-04, 0.585E-04, 1.19E-04*" 7.02 8.16 57 Tilling and others (1968) age of intrusion 60-100 MESH BIOTITE SEPARATE PLUS 12% CHLORITE 843 2 78.99 2.3 hornblende conventional K-Ar L-1023 "4.72E-04, 0.585E-04, 1.19E-04*" 0.548 0.637 56 Tilling and others (1968) age of intrusion 60-100 MESH HORNBLENDE SEPARATE PLUS 2% BIOTITE-CHLORITE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 844 1 69.6 2 biotite conventional K-Ar L-1024 "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 8.5 82 Tilling and others (1968) age of intrusion BIOTITE SEPARATE PLUS 3% CHLORITE 844 2 70.75 2.1 hornblende conventional K-Ar L-1024 "4.72E-04, 0.585E-04, 1.19E-04*" 1.29 1.34 69 Tilling and others (1968) age of intrusion HORNBLENDE PLUS 2% BIOTITE 845 1 74.71 2.2 biotite conventional K-Ar L-1025 "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 9.39 78 Tilling and others (1968) age of intrusion 845 2 73.7 2.2 biotite conventional K-Ar L-1025 "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 9.26 83 Tilling and others (1968) age of intrusion 846 1 76.84 2.3 biotite conventional K-Ar L-1116 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 9.38 79 Tilling and others (1968) age of intrusion BIOTITE CONCENTRATE WITH 18% CHLORITE AND ABOUT 5% HORNBLENDE 846 2 76.75 2.3 hornblende conventional K-Ar L-1116 "4.72E-04, 0.585E-04, 1.19E-04*" 0.52 0.587 53 Tilling and others (1968) age of intrusion 60-100 MESH SEPARATE OF 100% HORNBLENDE 847 1 77.47 2.3 biotite conventional K-Ar L-1117 "4.72E-04, 0.585E-04, 1.19E-04*" 8.95 10.2 89 Tilling and others (1968) age of intrusion 100% BIOTITE CONCENTRATE 847 2 74.79 2.2 biotite conventional K-Ar L-1117 "4.72E-04, 0.585E-04, 1.19E-04*" 8.95 9.84 93 Tilling and others (1968) age of intrusion 100% BIOTITE CONCENTRATE 847 3 83.5 2.7 hornblende conventional K-Ar L-1117 "4.72E-04, 0.585E-04, 1.19E-04*" 0.625 0.769 39 Tilling and others (1968) "sample contains excess radiogenic argon, age is too old" 100% HORNBLENDE SEPARATE 848 1 50.38 2.2 hornblende conventional K-Ar L-1020 "4.72E-04, 0.585E-04, 1.19E-04*" 0.59 0.434 28 age of intrusion 100% HORNBLENDE SEPARATE 849 1 42.1 1.2 biotite conventional K-Ar L-1021 "4.72E-04, 0.585E-04, 1.19E-04*" 8.35 5.12 74 minimum age of intrusion "60-100 MESH, 100% BIOTITE SEPARATE" 849 2 44.32 1.3 hornblende conventional K-Ar L-1021 "4.72E-04, 0.585E-04, 1.19E-04*" 0.743 0.48 45 maximum age of intrusion 60-100 MESH HORNBLENDE SEPARATE WITH 5% IMPURITIES 850 1 73.41 2.2 biotite conventional K-Ar L-1118 "4.72E-04, 0.585E-04, 1.19E-04*" 7.62 8.22 90 age of intrusion ANALYZED SEPARATE CONTAINS 20% CHLORITE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 850 2 74.99 2.2 biotite conventional K-Ar L-1118 "4.72E-04, 0.585E-04, 1.19E-04*" 7.62 8.4 74 age of intrusion ANALYZED SEPARATE CONTAINS 20% CHLORITE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 850 3 121.16 4 hornblende conventional K-Ar L-1118 "4.72E-04, 0.585E-04, 1.19E-04*" 0.848 1.53 72 age not evaluated "HORNBLENDE SEPARATE INCLUDES 2% IMPURITIES (BIOTITE, ETC.)" 850 4 121.16 4 hornblende conventional K-Ar L-1118 "4.72E-04, 0.585E-04, 1.19E-04*" 0.848 1.53 78 age not evaluated "HORNBLENDE SEPARATE INCLUDES 2% IMPURITIES (BIOTITE, ETC.)" POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 851 1 246.24 7 augite-ferroaugite conventional K-Ar L-1119 "4.72E-04, 0.585E-04, 1.19E-04*" 0.129 0.49 63 age not evaluated ANALYZED SEPARATE CONTAINED 2% IMPURITIES POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 852 1 37.81 1.1 biotite conventional K-Ar L-969 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 4.89 86 age of intrusion 80-100 MESH SEPARATE OF 100% BIOTITE THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 853 1 105.12 3 hornblende conventional K-Ar L-958 "4.72E-04, 0.585E-04, 1.19E-04*" 1.54 2.4 87 age of intrusion ANALYZED SEPARATE CONTAINED 2% FELDSPAR THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 854 1 111.55 3 hornblende conventional K-Ar L-959 "4.72E-04, 0.585E-04, 1.19E-04*" 1.34 2.22 63 age of intrusion ANALYZED SEPARATE CONTAINED 5% IMPURITIES THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 854 2 110.09 3 hornblende conventional K-Ar L-959 "4.72E-04, 0.585E-04, 1.19E-04*" 1.34 2.19 61 age of intrusion ANALYZED SEPARATE CONTAINED 5% IMPURITIES. 855 1 111.28 3 hornblende conventional K-Ar L-961 "4.72E-04, 0.585E-04, 1.19E-04*" 0.829 1.37 89 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 856 1 109.35 4 hornblende conventional K-Ar L-960 "4.72E-04, 0.585E-04, 1.19E-04*" 1.22 1.98 38 age of intrusion 60-100 MESH ANALYZED SEPARATE CONTAINED 5% IMPURITIES THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 857 1 116.84 3 biotite conventional K-Ar L-962 "4.72E-04, 0.585E-04, 1.19E-04*" 6.445 11.2 91 age of intrusion BIOTITE SEPARATE WITH 5% HORNBLENDE THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 857 2 109.4 3 hornblende conventional K-Ar L-962 "4.72E-04, 0.585E-04, 1.19E-04*" 1.01 1.64 90 age of intrusion 100% HORNBLENDE SEPARATE THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 858 1 113.42 3 biotite conventional K-Ar L-1013 "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 15 90 age of intrusion 80-100 MESH ANALYZED SEPARATE CONTAINED 2% IMPURITIES THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 859 1 111.12 3 biotite conventional K-Ar L-1014 "4.72E-04, 0.585E-04, 1.19E-04*" 10.06 16.6 96 age of intrusion 80-100 MESH AND ANALYZED SEPARATE CONTAINED 5% IMPURITIES THIS ANALYSIS ALSO REPORTED IN MCDOWELL AND KULP (1967) 860 1 149.59 4 biotite conventional K-Ar L-1040 "4.72E-04, 0.585E-04, 1.19E-04*" 7.66 17.2 85 age of intrusion BIOTITE SEPARATE WITH 1% CHLORITE AND 5-10% HORNBLENDE 860 2 142.94 5 hornblende conventional K-Ar L-1040 "4.72E-04, 0.585E-04, 1.19E-04*" 0.593 1.27 42 minimum age of intrusion HORNBLENDE SEPARATE PLUS 2% BIOTITE 861 1 22.3 0.7 biotite conventional K-Ar L-1041 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 2.53 66 age of intrusion 100% BIOTITE SEPARATE 862 1 126.56 5 biotite conventional K-Ar L-1042 "4.72E-04, 0.585E-04, 1.19E-04*" 7.47 14.1 86 age of intrusion ANALYZED SEPARATE CONTAINED 24% CHLORITE AND 10% HORNBLENDE 863 1 60.15 1.8 biotite conventional K-Ar L-849 "4.72E-04, 0.585E-04, 1.19E-04*" 5.53 4.87 62 age of intrusion ANALYZED SEPARATE CONTAINED 25% CHLORITE AND MINOR HORNBLENDE 863 2 57.72 1.7 hornblende conventional K-Ar L-849 "4.72E-04, 0.585E-04, 1.19E-04*" 0.913 0.771 74 age of intrusion ANALYZED SEPARATE CONTAINED 5% IMPURITIES POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 864 1 57.14 1.7 biotite conventional K-Ar L-852 "4.72E-04, 0.585E-04, 1.19E-04*" 7.19 6.01 72 minimum age of intrusion 20-40 MESH ANALYZED SEPARATE CONTAINED 15% CHLORITE "POTASSIUM DETERMINATIONS ARE 7.25, 7.10, AND 7.24% K20; AVERAGE IS LISTED AS 7.19%." 864 2 59.48 1.7 biotite conventional K-Ar L-852 "4.72E-04, 0.585E-04, 1.19E-04*" 7.19 6.26 66 age of intrusion 20-40 MESH ANALYZED SEPARATE CONTAINED 15% CHLORITE "POTASSIUM DETERMINATIONS ARE 7.25, 7.10, AND 7.24%." 865 1 71.95 2.1 hornblende conventional K-Ar L-851A "4.72E-04, 0.585E-04, 1.19E-04*" 0.669 0.707 60 age not evaluated ANALYZED SEPARATE CONTAINED LESS THAN 1% BIOTITE BUT 5% OTHER IMPURITIES. 866 1 52.62 2 biotite conventional K-Ar L-851B "4.72E-04, 0.585E-04, 1.19E-04*" 8.17 6.28 69 age not evaluated 100% BIOTITE SEPARATE 866 2 68.58 2.9 hornblende conventional K-Ar L-851B "4.72E-04, 0.585E-04, 1.19E-04*" 0.47 0.473 29 age not evaluated ANALYZED SEPARATE CONTAINED 2% QUARTZ-BIOTITE 867 1 59.2 1.8 biotite conventional K-Ar L-1017 "4.72E-04, 0.585E-04, 1.19E-04*" 5.99 5.19 65 age not evaluated ANALYZED SEPARATE CONTAINED 10% IMPURITIES. 867 2 59.6 1.8 hornblende conventional K-Ar L-1017 "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.873 63 age not evaluated ANALYZED SEPARATE CONTAINED 5% IMPURITITES INCLUDING BIOTITE 868 1 57.43 1.7 biotite conventional K-Ar L-1015 "4.72E-04, 0.585E-04, 1.19E-04*" 7.63 6.41 80 age of intrusion 100% BIOTITE SEPARATE 869 1 59.85 1.8 hornblende conventional K-Ar L-1016 "4.72E-04, 0.585E-04, 1.19E-04*" 0.928 0.813 50 age of intrusion 60-100 MESH ANALYZED SEPARATE CONTAINED ABUNDANT FELDSPAR 870 1 73.08 2.2 hornblende conventional K-Ar L-1052 "4.72E-04, 0.585E-04, 1.19E-04*" 0.61 0.655 65 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES INCLUDING BIOTITE 870 2 70.57 2.1 hornblende conventional K-Ar L-1052 "4.72E-04, 0.585E-04, 1.19E-04*" 0.61 0.632 57 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES INCLUDING BIOTITE 870 3 81.59 2.4 hornblende conventional K-Ar L-1052 "4.72E-04, 0.585E-04, 1.19E-04*" 0.61 0.733 44 age meaning uncertain (analysis questionable) ANALYZED SEPARATE CONTAINED 2% IMPURITIES INCLUDING BIOTITE 871 1 34.16 1 biotite conventional K-Ar L-1111 "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 4.22 73 age of volcanism 100% BIOTITE CONCENTRATE 872 1 27.24 0.8 biotite conventional K-Ar L-1051 "4.72E-04, 0.585E-04, 1.19E-04*" 8.96 3.54 75 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES 873 1 58.02 1.7 biotite conventional K-Ar L-946 "4.72E-04, 0.585E-04, 1.19E-04*" 8.67 7.36 81 age of intrusion ANALYZED SEPARATE CONTAINED 5% AEGIRINE-AUGITE 873 2 56.81 1.7 aegerine (acmite) conventional K-Ar L-946 "4.72E-04, 0.585E-04, 1.19E-04*" 0.42 0.349 39 age of intrusion AEGIRINE-AUGITE CONCENTRATE PLUS 2% BIOTITE POTASSIUM VALUE IS THE AVERAGE OF REPLICATE ANALYSES. 874 1 36.1 1.5 biotite conventional K-Ar L-948 "4.72E-04, 0.585E-04, 1.19E-04*" 9.6 5.04 80 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES. Reported age of 49.4 Ma is inconsistent with analytical data. 875 1 60.24 1.8 biotite conventional K-Ar L-1053 "4.72E-04, 0.585E-04, 1.19E-04*" 8.05 7.1 66 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES 876 1 51.82 1.5 biotite conventional K-Ar L-1112 "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 6.07 54 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES 877 1 57.14 1.7 biotite conventional K-Ar L-1113 "4.72E-04, 0.585E-04, 1.19E-04*" 7.43 6.21 62 age of intrusion 60-100 MESH ANALYZED SEPARATE CONTAINED 10% IMPURITITES 878 1 58.35 4.3 aegerine (acmite) conventional K-Ar L-1114 "4.72E-04, 0.585E-04, 1.19E-04*" 0.718 0.613 19 age of intrusion "60-100 MESH, 100% AEGIRINE CONCENTRATE" 879 1 22.28 0.7 biotite conventional K-Ar L-970 "4.72E-04, 0.585E-04, 1.19E-04*" 9.08 2.93 73 age of intrusion ANALYZED SEPARATE CONTAINED 2% CHLORITE 880 1 30.66 3 hornblende conventional K-Ar L-972 "4.72E-04, 0.585E-04, 1.19E-04*" 0.73 0.325 15 age of intrusion 60-100 MESH ANALYZED SEPARATE CONTAINED 5% IMPURITIES 881 1 37.71 1.1 biotite conventional K-Ar L-973 "4.72E-04, 0.585E-04, 1.19E-04*" 9.68 5.31 64 minimum age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES POTASSIUM VALUE IS AVERAGE OF 9.79 AND 9.57% AGE MAY REFLECT INFLUENCE OF POST-HYDROTHERMAL EVENT. 882 1 37.71 1.1 biotite conventional K-Ar L-974 "4.72E-04, 0.585E-04, 1.19E-04*" 9.37 5.14 73 minimum age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES AGE MAY REFLECT INFLUENCE OF POST-HYDROTHERMAL EVENT. 883 1 41.36 1.3 biotite conventional K-Ar L-975 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 5.27 37 age of intrusion ANALYZED SEPARATE CONTAINED 2% IMPURITIES. AGE MAY REFLECT THERMAL EFFECTS FROM EMPLACEMENT OF NEARBY BINGHAM-STOCK-DIKE-ORE SYSTEM. 884 1 27.28 0.8 biotite conventional K-Ar L-1038 "4.72E-04, 0.585E-04, 1.19E-04*" 7.43 2.94 62 age of intrusion ANALYZED SEPARATE CONTAINED 37% CHLORITE 896 1 1623.73 whole rock conventional K-Ar MBT-6 "4.72E-04, 0.585E-04, 1.19E-04*" 1.83 69.38 98 1.77 K20 DETERMINATION BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. "PROBABLE LOSS OF ARGON-40 BY DIFFUSION AND MINERAL RECRYSTALLIZATION, CAUSING LOWER AGE" 897 1 2384.98 whole rock conventional K-Ar MBT-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.138 9.86 95 age of intrusion POTASSIUM CONTENT IS AVERAGE OF REPLICATE GRAVIMETRIC DETERMINATIONS. 897 2 2384.98 110 whole rock 40Ar-40K isochron MBT-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.138 9.86 95 30 age of intrusion POTASSIUM CONTENT IS AVERAGE OF REPLICATE GRAVIMETRIC DETERMINATIONS. 898 1 2032.41 non-mineral substance conventional K-Ar MBT-18 "4.72E-04, 0.585E-04, 1.19E-04*" 0.84 45.49 98 age not evaluated POTASSIUM DETERMINED BY GRAVIMETRIC METHOD 899 1 1629.5 whole rock conventional K-Ar MBT-19 "4.72E-04, 0.585E-04, 1.19E-04*" 1.28 48.79 100 age not evaluated 1.29% K20 BY X-RAY FLUORESCENCE; OTHER VALUE DETERMINED BY GRAVIMETRIC METHOD. 900 1 1407.01 whole rock conventional K-Ar MBT-20 "4.72E-04, 0.585E-04, 1.19E-04*" 1.6 49.09 99 1.68% K20 BY X-RAY FLUORESCENSE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD PROBABLE LOSS OF ARGON-40 BY DIFFUSION AND MINERAL RECRYSTALLIZATION HAS LOWER K-AR AGE 901 1 2051.06 whole rock conventional K-Ar MBT-26 "4.72E-04, 0.585E-04, 1.19E-04*" 0.81 44.54 100 age not evaluated 0.83% K20 DETERMINED BY ISOTOPIC DILUTION; OTHER VALUE DETERMINED BY GRAVIMETRIC METHOD. 902 1 1238.82 whole rock conventional K-Ar MBT-27 "4.72E-04, 0.585E-04, 1.19E-04*" 1.05 26.92 87 age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC METHOD 903 1 1241.01 whole rock conventional K-Ar MBT-28 "4.72E-04, 0.585E-04, 1.19E-04*" 1.17 30.07 98 age of intrusion POTASSIUM VALUE IS AVERAGE OF REPLICATE GRAVIMETRIC ANALYSES 904 1 1624.43 whole rock conventional K-Ar MBT-29 "4.72E-04, 0.585E-04, 1.19E-04*" 1.28 48.56 99 age not evaluated POTASSIUM VALUE IS AVERAGE OF REPLICATE GRAVIMETRIC ANALYSES. 905 1 738.3 whole rock conventional K-Ar MBT-30 "4.72E-04, 0.585E-04, 1.19E-04*" 0.97 12.74 96 age of intrusion RUBIDIUM AND STRONTIUM VALUES DETERMINED BY X-RAY FLUORESENCE. 87SR/86SR DETERMINED BY UNSPIKED RUN. 905 2 738.3 32 whole rock 40Ar-40K isochron MBT-30 "4.72E-04, 0.585E-04, 1.19E-04*" 0.97 12.74 96 20 age of intrusion 1.01% K20 BY X-RAY FLUORESCENCE;OTHER VALUE DETERMINED BY GRAVIMETRIC METHOD. 906 1 1698.17 whole rock conventional K-Ar MBT-31 "4.72E-04, 0.585E-04, 1.19E-04*" 2.02 82.02 99 age not evaluated POTASSIUM DETERMINED BY GRAVIMETRIC METHOD. 907 1 1473.35 whole rock conventional K-Ar MBT-32 "4.72E-04, 0.585E-04, 1.19E-04*" 1.17 38.38 91 maximum age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC METHOD 908 1 1862.83 whole rock conventional K-Ar MBT-33 "4.72E-04, 0.585E-04, 1.19E-04*" 1.19 55.89 99 age not evaluated 1.15% K20 BY X-RAY FLUORESENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 909 1 1775.05 whole rock conventional K-Ar MBT-34 "4.72E-04, 0.585E-04, 1.19E-04*" 0.414 18.01 98 0.348% K2O BY X-RAY FLUORESCENCE; OTHER VALUE DETERMINED BY GRAVIMETRIC METHOD. PROBABLE LOSS OF ARGON-40 BY DIFFUSION AND MINERAL RECRYSTALLIZATION CAUSED LOWER K-AR AGE. 910 1 2045.85 whole rock conventional K-Ar MBT-35 "4.72E-04, 0.585E-04, 1.19E-04*" 0.61 33.4 100 age not evaluated 0.61% K20 BY X-RAY FLURESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 911 1 2293.39 whole rock conventional K-Ar MBT-36 "4.72E-04, 0.585E-04, 1.19E-04*" 0.332 22.12 100 age not evaluated 0.305% K20 BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD 912 1 1436.28 whole rock conventional K-Ar MBT-37A "4.72E-04, 0.585E-04, 1.19E-04*" 1.25 39.51 96 age not evaluated 1.21% K20 BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 913 1 1601.28 whole rock conventional K-Ar MBT-38 "4.72E-04, 0.585E-04, 1.19E-04*" 1.199 44.51 96 age not evaluated POTASSIUM VALUE IS AVERAGE OF REPLICATE GRAVIMETRIC ANALYSES 914 1 1880.34 whole rock conventional K-Ar MBT-39 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9 42.91 75 age not evaluated POTASSIUM VALUE IS AVERAGE OF REPLICATE GRAVIMETRIC ANALYSES. 915 1 1157.09 whole rock conventional K-Ar MBT-40 "4.72E-04, 0.585E-04, 1.19E-04*" 1.05 24.52 98 age not evaluated POTASSIUM DETERMINED BY ISOTOPIC DILUTION 916 1 2507.18 whole rock conventional K-Ar MBT-41 "4.72E-04, 0.585E-04, 1.19E-04*" 0.499 39.06 74 age of intrusion 0.50% K20 BY ISOTOPIC DILUTION; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 916 2 2507.18 110 whole rock 40Ar-40K isochron MBT-41 "4.72E-04, 0.585E-04, 1.19E-04*" 0.499 39.06 74 30 age of intrusion 0.50% K20 BY ISOTOPIC DILUTION; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 917 1 2598.83 whole rock conventional K-Ar MBT-42 "4.72E-04, 0.585E-04, 1.19E-04*" 1.24 103.8 100 age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC METHOD 917 2 2598.83 110 whole rock 40Ar-40K isochron MBT-42 "4.72E-04, 0.585E-04, 1.19E-04*" 1.24 103.8 100 30 age of intrusion POTASSIUM DETERMINED BY GRAVIMETRIC METHOD. 918 1 1468.64 non-mineral substance conventional K-Ar MBT-43A "4.72E-04, 0.585E-04, 1.19E-04*" 0.8 26.12 94 age not evaluated 0.749% K20 BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 919 1 1205.41 whole rock conventional K-Ar MBT-44 "4.72E-04, 0.585E-04, 1.19E-04*" 1.36 33.58 99 age not evaluated 1.36% K20 BY X-RAY FLUORESENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 920 1 1816.73 whole rock conventional K-Ar MBT-45 "4.72E-04, 0.585E-04, 1.19E-04*" 1.43 64.53 81 age not evaluated 1.35% K2O BY X-RAY FLUORESCENCE; THE OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 921 1 2535.34 whole rock conventional K-Ar MBT-48 "4.72E-04, 0.585E-04, 1.19E-04*" 0.48 38.36 97 age of intrusion 0.459% K20 BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 921 2 2535.34 110 whole rock 40Ar-40K isochron MBT-48 "4.72E-04, 0.585E-04, 1.19E-04*" 0.48 38.36 97 30 age of intrusion 0.459% BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 922 1 1629.69 whole rock conventional K-Ar MBT-49 "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 43.08 85 age not evaluated POTASSIUM DETERMINED BY A GRAVIMETRIC METHOD. 923 1 1091.64 whole rock conventional K-Ar MBT-52A "4.72E-04, 0.585E-04, 1.19E-04*" 1.16 25.05 98 age not evaluated POTASSIUM DETERMINED BY A GRAVIMETRIC METHOD. 923 2 1093.13 whole rock conventional K-Ar MBT-52B "4.72E-04, 0.585E-04, 1.19E-04*" 0.82 17.74 97 age not evaluated POTASSIUM DETERMINED BY GRAVIMETRIC METHOD. 924 1 2030 whole rock conventional K-Ar MBT-53 "4.72E-04, 0.585E-04, 1.19E-04" 1.09 98 age not evaluated POTASSIUM VALUE IS AVERAGE OF REPLICATE GRAVIMETRIC ANALYSES. 925 1 2068.58 whole rock conventional K-Ar MBT-54 "4.72E-04, 0.585E-04, 1.19E-04*" 0.54 30.12 98 age not evaluated POTASSIUM VALUE IS AVERAGE OF REPLICATE GRAVIMETRIC ANALYSES. 926 1 2541.78 whole rock conventional K-Ar MBT-57 "4.72E-04, 0.585E-04, 1.19E-04*" 0.44 35.33 95 age of intrusion 0.40% K20 BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY GRAVIMETRIC METHOD. 926 2 2541.78 110 whole rock 40Ar-40K isochron MBT-57 "4.72E-04, 0.585E-04, 1.19E-04*" 0.44 35.33 95 30 age of intrusion 0.40% K20 BY X-RAY FLUORESCENCE; OTHER VALUE OBTAINED BY A GRAVIMETRIC METHOD. 934 1 991.72 40 biotite conventional K-Ar PUF-9B "4.72E-04, 0.584E-04, 1.19E-04*" 7.23 137.6 89 age of intrusion ARGON-40 VALUE CALCULATED BY COMPILER 935 1 1035.62 40 biotite conventional K-Ar PUF-10B "4.72E-04, 0.584E-04, 1.19E-04*" 6.41 129.1 93 age of intrusion ARGON-40 VALUE CALCULATED BY COMPILER 936 1 1031.54 40 biotite conventional K-Ar PUF-16B "4.72E-04, 0.584E-04, 1.19E-04*" 8.26 165.5 80 age of intrusion ARGON-40 VALUE WAS CALCULATED BY COMPILER 937 1 1015.4 40 biotite conventional K-Ar PUF-17B "4.72E-04, 0.584E-04, 1.19E-04*" 8.57 168.2 97 age of intrusion ARGON-40 VALUE WAS CALCULATED BY COMPILER. 937 2 1043.35 40 biotite conventional K-Ar PUF-17B "4.72E-04, 0.584E-04, 1.19E-04*" 8.57 174.3 91 age of intrusion ARGON-40 VALUE WAS CALCULATED BY COMPILER. 938 1 1298.1 60 muscovite conventional K-Ar PUF-7M "4.72E-04, 0.584E-04, 1.19E-04*" 10.16 278 90 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER 938 2 1315 60 muscovite conventional K-Ar PUF-7M "4.72E-04, 0.584E-04, 1.19E-04*" 10.16 283.1 99 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 939 1 1478.27 60 biotite conventional K-Ar PUF-8B "4.72E-04, 0.584E-04, 1.19E-04*" 7.49 246.9 99 age of intrusion ARGON-40 VALUE WAS CALCULATED BY COMPILER 940 1 1546.92 60 biotite conventional K-Ar PUF-29B "4.72E-04, 0.584E-04, 1.19E-04*" 6.61 233 96 age of intrusion ARGON-40 VALUE DETERMINED BY COMPILER 941 1 993.91 40 biotite conventional K-Ar PUF-13B "4.72E-04, 0.584E-04, 1.19E-04*" 8.54 163 62 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER 942 1 1151.32 60 biotite conventional K-Ar PUF-14B "4.72E-04, 0.584E-04, 1.19E-04*" 9.14 212 98 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 943 1 1341.25 60 biotite conventional K-Ar PUF-34B "4.72E-04, 0.584E-04, 1.19E-04*" 8.91 255.3 99 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 944 1 1439.04 60 biotite conventional K-Ar PUF-24B "4.72E-04, 0.584E-04, 1.19E-04*" 8.55 271 98 age of intrusion ARGON-40 VALUE WAS CALCULATED BY COMPILER 945 1 1398.89 60 biotite conventional K-Ar PUF-32B "4.72E-04, 0.584E-04, 1.19E-04*" 8.67 263.8 99 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMP1LER. 946 1 1462.74 60 biotite conventional K-Ar PUF-35B "4.72E-04, 0.584E-04, 1.19E-04*" 7.85 254.8 97 age of intrusion ARGON-40 VALUE WAS CALCULATED BY COMPILER 947 1 1207.5 60 biotite conventional K-Ar PUF-37B "4.72E-04, 0.584E-04, 1.19E-04*" 9.2 227.7 98 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 948 1 1222.08 60 biotite conventional K-Ar PUF-19B "4.72E-04, 0.584E-04, 1.19E-04*" 9.28 233.5 96 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 949 1 1228.02 60 biotite conventional K-Ar PUF-23B "4.72E-04, 0.584E-04, 1.19E-04*" 8.63 218.6 99 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 950 1 1064.06 40 biotite conventional K-Ar PUF-21B "4.72E-04, 0.584E-04, 1.19E-04*" 7.1 148.2 99 age not evaluated SEPARATE CONTAINED 18% CHLORITE ARGON-40 VALUE CALCULATED BY COMPILER. 951 1 1349.39 60 biotite conventional K-Ar PUF-22B "4.72E-04, 0.584E-04, 1.19E-04*" 7.82 226 95 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 952 1 1246.49 60 biotite conventional K-Ar PUF-26B "4.72E-04, 0.584E-04, 1.19E-04*" 9.73 251.6 69 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 953 1 1389.8 60 biotite conventional K-Ar PUF-18B "4.72E-04, 0.584E-04, 1.19E-04*" 6.98 210.4 98 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER. 954 1 1185.79 60 biotite conventional K-Ar PUF-30B "4.72E-04, 0.584E-04, 1.19E-04*" 8.93 215.6 86 age not evaluated ARGON-40 VALUE WAS CALCULATED BY COMPILER 955 1 1.6 biotite conventional K-Ar KA-65 "4.72E-04, 0.585E-04, 1.19E-04" 7.96 21 Evernden and others (1957) age of intrusion POTASSIUM VALUE PUBLISHED AS 6.61% K; NO ANALYTICAL ERROR LISTED. 956 1 1.5 biotite conventional K-Ar KA-101 "4.72E-04, 0.585E-04, 1.19E-04" 4.87 8 Evernden and others (1957) minimum age of volcanism POTASSIUM VALUE PUBLISHED AS 4.04% K; NO ANALYTICAL ERROR LISTED. 957 1 32.8 biotite conventional K-Ar KA-145 "4.72E-04, 0.585E-04, 1.19E-04" 7.35 71 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.1% K; NO ANALYTICAL ERROR LISTED. 958 1 15.2 biotite conventional K-Ar KA-161 "4.72E-04, 0.585E-04, 1.19E-04" 5.06 9 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.20% K; NO ANALYTICAL ERROR LISTED. 959 1 33.4 biotite conventional K-Ar KA-175 "4.72E-04, 0.585E-04, 1.19E-04" 7.69 50 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.38% K; NO ANALYTICAL ERROR LISTED EVERNDEN AND OTHERS (1961) REPORT AN AGE OF 32+/-1 FOR THIS SAMPLE BUT USED DECAY CONSTANT OF 0.584 E-10/YR 960 1 0.98 sanidine conventional K-Ar KA-305 "4.72E-04, 0.585E-04, 1.19E-04" 10.25 43 age of volcanism SANIDINE GRAIN SIZE WAS GREATER THAN 420 MICRONS. POTASSIUM VALUE PUBLISHED AS 8.51% K; NO ANALYTICAL ERROR LISTED 960 2 0.98 sanidine conventional K-Ar KA-320 "4.72E-04, 0.585E-04, 1.19E-04" 10.35 47 age of volcanism SANIDINE GRAIN SIZE WAS BETWEEN 250 AND 420 MICRONS POTASSIUM VALUE PUBLISHED AS 8.59% K; NO ANAYLYTICAL ERROR LISTED 960 3 0.91 sanidine conventional K-Ar KA-321 "4.72E-04, 0.585E-04, 1.19E-04" 10.75 47 age of volcanism SANIDINE GRAIN SIZE WAS BETWEEN 250 AND 150 MICRONS POTASSIUM VALUE WAS PUBLISHED AS 8.92% K; NO ANALYTICAL ERROR LISTED 960 4 0.92 sanidine conventional K-Ar KA-328 "4.72E-04, 0.585E-04, 1.19E-04" 10.42 28 age of volcanism SANIDINE GRAIN SIZE WAS BETWEEN 105 AND 150 MICRONS POTASSIUM VALUE PUBLISHED AS 8.65% K; NO ANALYTICAL ERROR LISTED 961 1 11.2 biotite conventional K-Ar KA-414 "4.72E-04, 0.585E-04, 1.19E-04" 7.67 48 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.37% K; NO ANALYTICAL ERROR LISTED. 962 1 15.1 biotite conventional K-Ar KA-449 "4.72E-04, 0.585E-04, 1.19E-04" 5.82 59 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.83% K; NO ANALYTICAL ERROR LISTED. 963 1 2.2 biotite conventional K-Ar KA-451 "4.72E-04, 0.585E-04, 1.19E-04" 3.87 4 minimum age of volcanism POTASSIUM VALUE PUBLISHED AS 3.21% K; NO ANALYTICAL ERROR LISTED 964 1 10 biotite conventional K-Ar KA-453 "4.72E-04, 0.585E-04, 1.19E-04" 7.9 29 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.56% K; NO ANALYTICAL ERROR LISTED 965 1 17.1 biotite conventional K-Ar KA-478 "4.72E-04, 0.585E-04, 1.19E-04" 6.24 66 age of volcanism POTASSIUM VALUE PUBLISHED AS 5.18% K; NO ANALYTICAL ERROR LISTED 966 1 11.1 biotite conventional K-Ar KA-480 "4.72E-04, 0.585E-04, 1.19E-04" 5.59 64 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.64% K; NO ANALYTICAL ERROR LISTED 967 1 21.3 biotite conventional K-Ar KA-481 "4.72E-04, 0.585E-04, 1.19E-04" 6.25 16 age of volcanism POTASSIUM VALUE PUBLISHED AS 5.19% K; NO ANALYTICAL ERROR LISTED 968 1 10.5 biotite conventional K-Ar KA-482 "4.72E-04, 0.585E-04, 1.19E-04" 8.14 11 minimum age of volcanism POTASSIUM VALUE PUBLISHED AS 6.76% K; NO ANALYTICAL ERROR LISTED 968 2 11.2 biotite conventional K-Ar KA-482II "4.72E-04, 0.585E-04, 1.19E-04" 8.14 10 age of volcanism CONVERTED FROM 6.76% K; NO ANALYTICAL ERROR LISTED 969 1 33 sanidine conventional K-Ar KA-483 "4.72E-04, 0.585E-04, 1.19E-04" 5.7 79 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.73% K; NO ANALYTICAL ERROR LISTED 970 1 9.3 biotite conventional K-Ar KA-485 "4.72E-04, 0.585E-04, 1.19E-04" 5.38 36 age of volcanism GIVEN AS 4.47% K; NO ANALYTICAL ERROR GIVEN 971 1 31.1 sanidine conventional K-Ar KA-489 "4.72E-04, 0.585E-04, 1.19E-04" 6.88 46 age of volcanism GIVEN AS 5.71% K; NO ANALYTICAL ERROR LISTED 972 1 1.9 biotite conventional K-Ar KA-490 "4.72E-04, 0.585E-04, 1.19E-04" 8.94 25 age of volcanism GIVEN AS 7.42% K; NO ANALYTICAL ERROR LISTED 973 1 11.4 biotite conventional K-Ar KA-499 "4.72E-04, 0.585E-04, 1.19E-04" 7.37 69 age of volcanism GIVEN AS 6.12% K; NO ANALYTICAL ERROR LISTED 974 1 10.6 glass conventional K-Ar KA-500 "4.72E-04, 0.585E-04, 1.19E-04" 6.47 33 minimum age of volcanism GIVEN AS 5.37% K; NO ERROR GIVEN 975 1 10.8 biotite conventional K-Ar KA-551 "4.72E-04, 0.585E-04, 1.19E-04" 7.88 64 age of volcanism POTASSIUM VALUE PUBLISHED AS 7.88% K; NO ANALYTICAL ERROR GIVEN 976 1 11 biotite conventional K-Ar KA-552 "4.72E-04, 0.585E-04, 1.19E-04" 8.01 9 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.65% K; NO ANALYTICAL ERROR GIVEN 977 1 8.9 sanidine conventional K-Ar KA-559 "4.72E-04, 0.585E-04, 1.19E-04" 8.79 34 age of volcanism POTASSIUM VALUE PUBLISHED AS 7.30% K; NO ANALYTICAL ERROR GIVEN 978 1 11.5 sanidine conventional K-Ar KA-577 "4.72E-04, 0.585E-04, 1.19E-04" 7.16 67 age of volcanism POTASSIUM VALUE PUBLISHED AS 5.94% K; NO ANALYTICAL ERROR GIVEN 979 1 3.3 plagioclase conventional K-Ar KA-587 "4.72E-04, 0.585E-04, 1.19E-04" 3.9 9 age of volcanism POTASSIUM VALUE PUBLISHED AS 3.24% K; NO ANALYTICAL ERROR GIVEN 980 1 21.6 adularia conventional K-Ar KA-646 "4.72E-04, 0.585E-04, 1.19E-04" 14.2 69 minimum age of volcanism "AUTHIGENIC ADULARIA, POST-DEPOSITIONAL" POTASSIUM VALUE PPUBLISHED AS 11.8% K; NO ANALYTICAL ERROR GIVEN AGE INDICATES TIME OF FORMATION FOR THE ADULARIA 981 1 23.3 sanidine conventional K-Ar KA-647A "4.72E-04, 0.585E-04, 1.19E-04" 6.85 56 age of volcanism POTASSIUM VALUE PUBLISHED AS 5.69% K; NO ANALYTICAL ERROR GIVEN 982 1 25.3 glass conventional K-Ar KA-648 "4.72E-04, 0.585E-04, 1.19E-04" 5.43 42 age of volcanism ONLY INTERIOR FRAGMENTS OF LAPILLI USED IN ANALYSIS POTASSIUM VALUE PUBLISHED AS 4.51% K; NO ANALYTICAL ERROR GIVEN 983 1 24.9 albite conventional K-Ar KA-649A "4.72E-04, 0.585E-04, 1.19E-04" 1.72 30 age of volcanism POTASSIUM VALUE PUBLISHED AS 1.43% K; NO ANALYTICAL ERROR GIVEN 984 1 9.8 whole rock conventional K-Ar KA-814 "4.72E-04, 0.585E-04, 1.19E-04" 1.48 9 minimum age of intrusion POTASSIUM VALUE PUBLISHED AS 1.23% K; NO ANALYTICAL ERROR GIVEN 985 1 9.8 whole rock conventional K-Ar KA-816 "4.72E-04, 0.585E-04, 1.19E-04" 1.45 14 age of volcanism POTASSIUM VALUE PUBLISHED AS 1.45% K; NO ANALYTICAL ERROR GIVEN 986 1 37.5 whole rock conventional K-Ar KA-818 "4.72E-04, 0.585E-04, 1.19E-04" 1.171 46 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.972% K; NO ANALYTICAL ERROR GIVEN 987 1 37.4 sanidine conventional K-Ar KA-825 "4.72E-04, 0.585E-04, 1.19E-04" 9.79 46 age of volcanism POTASSIUM VALUE PUBLISHED AS 8.13% K; NO ANALYTICAL ERROR GIVEN 987 2 37.5 biotite conventional K-Ar KA-826 "4.72E-04, 0.585E-04, 1.19E-04" 6.67 26 age of volcanism GIVEN AS 5.54% K; NO ANALYTICAL ERROR GIVEN 987 3 36 glass conventional K-Ar KA-827 "4.72E-04, 0.585E-04, 1.19E-04" 5.76 81 minimum age of volcanism GIVEN AS 4.78% K; NO ANALYTICAL ERROR GIVEN 988 1 10 glass conventional K-Ar KA-830 "4.72E-04, 0.585E-04, 1.19E-04" 5.69 48 age of volcanism GLASS IN THE FORM OF COARSE ASH POTASSIUM VALUE PUBLISHED AS 4.72% K; NO ANALYTICAL ERROR GIVEN 989 1 3.3 glass conventional K-Ar KA-831 "4.72E-04, 0.585E-04, 1.19E-04" 4.6 23 minimum age of volcanism HYDRATED AND NON-HYDRATED GLASS IN THE FORM OF ASH POTASSIUM VALUE PUBLISHED AS 3.82% K; NO ANALYTICAL ERROR GIVEN 990 1 3.2 glass conventional K-Ar KA-832 "4.72E-04, 0.585E-04, 1.19E-04" 3.85 19 minimum age of volcanism HYDRATED AND NON-HYDRATED GLASS IN THE FORM OF ASH POTASSIUM VALUE PUBLISHED AS 3.20% K; NO ANALYTICAL ERROR GIVEN 991 1 31.5 whole rock conventional K-Ar KA-845 "4.72E-04, 0.585E-04, 1.19E-04" 1.45 45 age of volcanism POTASSIUM VALUE PUBLISHED AS 1.20% K; NO ANALYTICAL ERROR GIVEN 992 1 14.7 glass conventional K-Ar KA-891 "4.72E-04, 0.585E-04, 1.19E-04" 5.76 42 age of volcanism GLASS IN THE FORM OF ASH SHARDS POTASSIUM VALUE PUBLISHED AS 4.78% K; NO ANALTICAL ERROR GIVEN 993 1 58.7 whole rock conventional K-Ar KA-978 "4.72E-04, 0.585E-04, 1.19E-04" 4.47 97 POTASSIUM VALUE PUBLISHED AS 3.71% K; NO ANALYTICAL ERROR GIVEN "AGE IS APPARENTLY TOO YOUNG, SHOULD BE ABOUT 65 M.Y." 994 1 46 glass conventional K-Ar KA-979 "4.72E-04, 0.585E-04, 1.19E-04" 5.96 90 POTASSIUM VALUE PUBLISHED AS 4.95% K; NO ANALYTICAL ERROR GIVEN AGE IS MUCH TOO OLD; SAMPLE CONTAMINATED 995 1 29.5 glass conventional K-Ar KA-981 "4.72E-04, 0.585E-04, 1.19E-04" 6.07 64 maximum age of volcanism POTASSIUM VALUE PUBLISHED AS 5.04% K; NO ANALYTICAL ERROR GIVEN SAMPLE MAY HAVE BEEN CONTAMINATED WITH OLDER MATERIAL 996 1 25.6 glass conventional K-Ar KA-985 "4.72E-04, 0.585E-04, 1.19E-04" 3.2 34 age of volcanism GLASS ASH POTASSIUM VALUE PUBLISHED AS 2.66% K; NO ANALYTICAL ERROR GIVEN 997 1 64.8 plagioclase conventional K-Ar KA-992 "4.72E-04, 0.585E-04, 1.19E-04" 7.26 61 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.03% K (THIS APPEARS TOO LARGE A VALUE FOR PLAGIOCLASE); NO ANALYTICAL ERROR GIVEN 998 1 9.89 plagioclase conventional K-Ar KA-829 "4.72E-04, 0.585E-04, 1.19E-04" 0.336 17 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.279% K; NO ANALYTICAL ERROR GIVEN 999 1 11.7 whole rock conventional K-Ar KA-993 "4.72E-04, 0.585E-04, 1.19E-04" 0.749 30 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.622% K; NO ANALYTICAL ERROR GIVEN 1000 1 29.7 K feldspar conventional K-Ar KA-1000 "4.72E-04, 0.585E-04, 1.19E-04" 5.55 95 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.61% K; NO ANALYTICAL ERROR GIVEN 1001 1 11.4 whole rock conventional K-Ar KA-1001 "4.72E-04, 0.585E-04, 1.19E-04" 0.496 14 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.412% K; NO ANALYTICAL ERROR GIVEN 1002 1 7.7 whole rock conventional K-Ar KA-1003 "4.72E-04, 0.585E-04, 1.19E-04" 0.439 12 minimum age of volcanism POTASSIUM VALUE PUBLISHED AS 0.364% K; NO ANALYTICAL ERROR GIVEN 1003 1 5.2 K feldspar conventional K-Ar KA-1005 "4.72E-04, 0.585E-04, 1.19E-04" 10.08 43 age of volcanism POTASSIUM VALUE PUBLISHED AS 8.37% K; NO ANALYTICAL ERROR GIVEN 1004 1 36.8 K feldspar conventional K-Ar KA-1010 "4.72E-04, 0.585E-04, 1.19E-04" 6.06 96 age of volcanism POTASSIUM VALUE PUBLISHED AS 5.03% K; NO ANALYTICAL ERROR GIVEN 1005 1 15.6 sanidine conventional K-Ar KA-1017 "4.72E-04, 0.585E-04, 1.19E-04" 5.69 90 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.72% K; NO ANALYTICAL ERROR GIVEN 1006 1 2 biotite conventional K-Ar KA-1026 "4.72E-04, 0.585E-04, 1.19E-04" 7.23 24 age of volcanism POTASSIUM VALUE PUBLISHED AS 6.00% K; NO ANALYTICAL ERROR GIVEN 1007 1 4.1 whole rock conventional K-Ar KA-1027 "4.72E-04, 0.585E-04, 1.19E-04" 1.71 12 minimum age of volcanism POTASSIUM VALUE PUBLISHED AS 1.42% K; NO ANALYTICAL ERROR GIVEN 1008 1 15.1 sanidine conventional K-Ar KA-1029 "4.72E-04, 0.585E-04, 1.19E-04" 4.76 91 age of volcanism POTASSIUM VALUE PUBLISHED AS 3.95% K; NO ANALYTICAL ERROR GIVEN 1009 1 14.5 whole rock conventional K-Ar KA-1165 "4.72E-04, 0.585E-04, 1.19E-04" 1.643 40 age of volcanism POTASSIUM VALUE PUBLISHED AS 1.364% K; NO ANALYTICAL ERROR GIVEN 1010 1 3.48 whole rock conventional K-Ar KA-1173 "4.72E-04, 0.585E-04, 1.19E-04" 0.279 8 minimum age of volcanism CRUSHED BASALT SIZED TO -60 +100 MESH AND THEN LEACHED WITH 5% HF FOR 20 MINUTES TO REMOVE DEVITRIFIED AND ALTERED GROUNDMASS POTASSIUM VALUE PUBLISHED AS 0.232% K; NO ANALYTICAL ERROR GIVEN 1011 1 1.36 whole rock conventional K-Ar KA-1188 "4.72E-04, 0.585E-04, 1.19E-04" 0.75 44 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.62% K; NO ANALYTICAL ERROR GIVEN 1012 1 15.4 whole rock conventional K-Ar KA-1203 "4.72E-04, 0.585E-04, 1.19E-04" 0.778 8 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.646% K; NO ANALYTICAL ERROR GIVEN 1013 1 6.4 sanidine conventional K-Ar KA-1206 "4.72E-04, 0.585E-04, 1.19E-04" 4.643 84 age of volcanism POTASSIUM VALUE PUBLISHED AS 3.854% K; NO ANALYTICAL ERROR GIVEN 1014 1 8.9 sanidine conventional K-Ar KA-1225 "4.72E-04, 0.585E-04, 1.19E-04" 6.992 98 age of volcanism POTASSIUM VALUE PUBLISHED AS 5.804% K; NO ANALYTICAL ERROR GIVEN 1015 1 14.7 plagioclase conventional K-Ar KA-1251 "4.72E-04, 0.585E-04, 1.19E-04" 0.367 58 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.305% K; NO ANALYTICAL ERROR GIVEN 1016 1 8.1 plagioclase conventional K-Ar KA-1262 "4.72E-04, 0.585E-04, 1.19E-04" 0.401 14 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.333% K; NO ANALYTICAL ERROR GIVEN. 1017 1 42.7 plagioclase conventional K-Ar KA-1274 "4.72E-04, 0.585E-04, 1.19E-04" 1.706 86 age of volcanism POTASSIUM VALUE PUBLISHED AS 1.416% K; NO ANALYTICAL ERROR GIVEN. 1018 1 10.7 sanidine conventional K-Ar KA-1275 "4.72E-04, 0.585E-04, 1.19E-04" 5.378 31 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.464% K; NO ANALYTICAL ERROR GIVEN. 1019 1 11 sanidine conventional K-Ar KA-1365 "4.72E-04, 0.585E-04, 1.19E-04" 5.473 94 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.543% K; NO ANALYTICAL ERROR GIVEN. 1020 1 12.3 biotite conventional K-Ar KA-1368 "4.72E-04, 0.585E-04, 1.19E-04" 3.86 30 age of volcanism POTASSIUM VALUE PUBLISHED AS 3.204% K; NO ANALYTICAL ERROR GIVEN. 1020 2 11.5 plagioclase conventional K-Ar KA-1372 "4.72E-04, 0.585E-04, 1.19E-04" 0.432 64 age of volcanism POTASSIUM VALUE PUBLISHED AS 0.359% K; NO ANALYTICAL ERROR GIVEN. 1021 1 15.4 sanidine conventional K-Ar KA-1380 "4.72E-04, 0.585E-04, 1.19E-04" 10.343 97 age of volcanism POTASSIUM VALUE PUBLISHED AS 8.586% K; NO ANALYTICAL ERROR GIVEN 1022 1 10.7 biotite conventional K-Ar KA-452 "4.72E-04, 0.585E-04, 1.19E-04" 8.49 36 age of volcanism POTASSIUM VALUE PUBLISHED AS 7.05% K; NO ANALYTICAL ERROR GIVEN 1023 1 36.5 andesine conventional K-Ar KA-824A "4.72E-04, 0.585E-04, 1.19E-04" 5.53 86 age of volcanism POTASSIUM VALUE PUBLISHED AS 4.59% K; NO ANALYTICAL ERROR GIVEN 1030 1 2431.3 49 muscovite conventional K-Ar KD-5 "4.72E-04, 0.584E-04, 1.19E-04*" 10.47 774.6 99 age of intrusion VERY COARSE MUSCOVITE POTASSIUM VALUE IS CONVERTED AVERAGE OF 8.61% AND 8.77%; ARGON VALUE IS CONVERTED FROM 0.001736 CC STP 1030 2 2527.96 51 muscovite conventional K-Ar KD-5 "4.72E-04, 0.584E-04, 1.19E-04*" 10.47 832.2 98 age of intrusion VERY COARSE MUSCOVITE POTASSIUM VALUE IS CONVERTED AVERAGE OF 8.61% AND 8.77% K; ARGON VALUE IS CONVERTED FROM 0.001865 CC STP 1031 1 1352.66 27 hornblende conventional K-Ar L9 "4.72E-04, 0.584E-04, 1.19E-04*" 1.54 44.66 98 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.28% AND 1.28% K; ARGON VALUE IS CONVERTED FROM 0.0001001 CC 1032 1 1378.71 28 biotite conventional K-Ar L10A "4.72E-04, 0.584E-04, 1.19E-04*" 6.98 208 97 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM 5.79% K; ARGON VALUE IS CONVERTED FROM 0.000466 CC 1033 1 1656.96 32 hornblende conventional K-Ar L11 "4.72E-04, 0.584E-04, 1.19E-04*" 0.289 11.3 84 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.243% AND 0.236% K; ARGON VALUE IS CONVERTED FROM 0.0000253 CC 1033 2 1656.96 32 hornblende conventional K-Ar L11 "4.72E-04, 0.584E-04, 1.19E-04*" 0.289 11.3 74 age of later metamorphism -40 +60 MESH POTASSIUM VALUE IS CONVERTED FROM AVERAGE OF 0.243% AND 0.236% K; ARGON VALUE IS CONVERTED FROM 0.0000253 CC STP 1035 1 1515.04 30 biotite conventional K-Ar L13 "4.72E-04, 0.584E-04, 1.19E-04*" 8.69 297 95 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.19% AND 7.24% K; ARGON VALUE IS CONVERTED FROM 0.000666 CC 1039 1 1563.35 31 biotite conventional K-Ar L27 "4.72E-04, 0.584E-04, 1.19E-04*" 6.73 241 97 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS THE CONVERTED AVERAGE OF 5.62% AND 5.55% K; ARGON VALUE IS CONVERTED FROM 0.000541 CC 1041 1 1514.19 30 biotite conventional K-Ar L29 "4.72E-04, 0.584E-04, 1.19E-04*" 2.28 77.86 96 initial age disturbed by later metamorphism MOSTLY CHLORITE IN -40 +60 MESH ANALYTICAL MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.91% AND 1.88% K; ARGON VALUE IS CONVERTED FROM 0.0001745 CC 1042 1 1440.68 29 biotite conventional K-Ar L32 "4.72E-04, 0.584E-04, 1.19E-04*" 6.52 207 96 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGE OF 5.40% AND 5.43% K; ARGON VALUE IS CONVERTED FROM 0.000464 CC 1042 2 1654.32 33 muscovite conventional K-Ar L32 "4.72E-04, 0.584E-04, 1.19E-04*" 10.05 392 98 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 8.30% AND 8.39% K; ARGON VALUE IS CONVERTED FROM 0.000879 CC STP 1043 1 1370.18 27 biotite conventional K-Ar L16 "4.72E-04, 0.584E-04, 1.19E-04*" 1.79 52.87 87 initial age disturbed by later metamorphism MOSTLY CHLORITE IN THE -40 +60 MESH ANALYZED MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.49% AND 1.49% K; ARGON VALUE IS CONVERTED FROM 0.0001185 CC 1044 1 1402.55 28 biotite conventional K-Ar L18A "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 237 97 minimum age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 6.48% AND 6.41% K; ARGON VALUE IS CONVERTED FROM 0.000531 CC 1044 2 1401 28 biotite conventional K-Ar L18A "4.72E-04, 0.584E-04, 1.19E-04*" 7.87 240 97 minimum age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 6.48% AND 6.41% K; ARGON VALUE IS CONVERTED FROM 0.000537 CC STP 1044 3 1519 30 hornblende conventional K-Ar L18A "4.72E-04, 0.584E-04, 1.19E-04" 27.2 maximum age of intrusion -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.655%, 0.646%, AND 0.660% K; ARGON VALUE IS CONVERTED FROM 0.0000609 CC STP" 1044 4 1503.66 30 hornblende conventional K-Ar L18A "4.72E-04, 0.584E-04, 1.19E-04*" 0.787 26.6 96 maximum age of intrusion -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.655%, 0.646%, AND 0.660% K; ARGON VALUE IS CONVERTED FROM 0.0000596 CC STP" 1045 1 1369.03 27 biotite conventional K-Ar L19 "4.72E-04, 0.584E-04, 1.19E-04*" 9.22 272 97 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.69% AND 7.61% K; ARGON VALUE IS CONVERTED FROM 0.000609 CC 1046 1 1819.57 36 hornblende conventional K-Ar L23 "4.72E-04, 0.584E-04, 1.19E-04*" 0.294 13.3 93 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.246% AND 0.242% K; ARGON VALUE IS CONVERTED FROM 0.0000299 CC 1046 2 1819.57 36 hornblende conventional K-Ar L23 "4.72E-04, 0.584E-04, 1.19E-04*" 0.294 13.3 69 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.246% AND 0.242% K; ARGON VALUE IS CONVERTED FROM 0.0000299 CC STP 1047 1 1766.71 35 hornblende conventional K-Ar L25 "4.72E-04, 0.584E-04, 1.19E-04*" 0.396 17.1 91 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.330%, 0.329% AND 0.327% K; ARGON VALUE IS CONVERTED FROM 0.0000384 CC" 1047 2 1773.29 35 hornblende conventional K-Ar L25 "4.72E-04, 0.584E-04, 1.19E-04*" 0.396 17.2 91 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.330%, 0.329%, AND 0.327% K; ARGON VALUE IS CONVERTED FROM 0.0000386 CC STP" 1048 1 1479.51 29 biotite conventional K-Ar L30 "4.72E-04, 0.584E-04, 1.19E-04*" 0.709 23.4 78 initial age disturbed by later metamorphism MAINLY CHLORITE IN -40 +60 MESH ANALYZED MATERIAL POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.589% AND 0.588 K; ARGON VALUE IS CONVERTED FROM 0.0000524 CC 1048 2 1440.25 29 biotite conventional K-Ar L30 "4.72E-04, 0.584E-04, 1.19E-04*" 0.709 22.5 86 initial age disturbed by later metamorphism MAINLY CHLORITE IN -40 +60 MESH ANALYZED MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGE OF 0.589% AND 0.588% K; ARGON VALUE IS CONVERTED FROM 0.0000504 CC STP 1049 1 1824.45 36 biotite conventional K-Ar L33 "4.72E-04, 0.584E-04, 1.19E-04*" 7.66 348 99 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.35% AND 6.37% K; ARGON VALUE IS CONVERTED FROM 0.000779 CC 1049 2 1804.55 36 biotite conventional K-Ar L33 "4.72E-04, 0.584E-04, 1.19E-04*" 7.66 342 92 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.35% AND 6.37% K; ARGON VALUE IS CONVERTED FROM 0.000766 CC STP 1050 1 2228.64 45 biotite conventional K-Ar L36 "4.72E-04, 0.584E-04, 1.19E-04*" 6.96 441 98 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 5.84% AND 5.72% K; ARGON VALUE IS CONVERTED FROM 0.000989 CC 1051 1 1266.2 25 biotite conventional K-Ar L37 "4.72E-04, 0.584E-04, 1.19E-04*" 6.13 162 95 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 5.06% AND 5.12% K; ARGON VALUE IS CONVERTED FROM 0.000362 CC 1052 1 1346.26 27 biotite conventional K-Ar L39 "4.72E-04, 0.584E-04, 1.19E-04*" 6.11 176 97 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUUE IS CONVERTED FROM AVERAGED 5.05% AND 5.09% K; ARGON VALUE IS CONVERTED FROM 0.000394 CC 1053 1 1374.71 27 biotite conventional K-Ar L62 "4.72E-04, 0.584E-04, 1.19E-04*" 8.02 238 97 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.64% AND 6.67% K; ARGON VALUE IS CONVERTED FROM 0.000534 CC 1054 1 1324.39 26 biotite conventional K-Ar L63 "4.72E-04, 0.584E-04, 1.19E-04*" 7.71 217 98 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.41% AND 6.39% K; ARGON VALUE IS CONVERTED FROM 0.000486 CC 1054 2 1388.11 28 biotite conventional K-Ar L63 "4.72E-04, 0.584E-04, 1.19E-04*" 7.71 232 90 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.41% AND 6.39% K; ARGON VALUE IS CONVERTED FROM 0.000520 CC STP 1055 1 926.93 18 biotite conventional K-Ar L64 "4.72E-04, 0.584E-04, 1.19E-04*" 0.986 17.2 76 age not evaluated MAINLY CHLORITE IN THE -40 +60 MESH ANALYZED MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.825% AND 0.812% K; ARGON VALUE IS CONVERTED FROM 0.0000385 CC STP 1055 2 926.93 18 biotite conventional K-Ar L64 "4.72E-04, 0.584E-04, 1.19E-04*" 0.986 17.2 74 age not evaluated MAINLY CHLORITE IN -40 TO +60 MESH ANALYZED MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.825% AND 0.812% K; ARGON VALUE IS CONVERTED FROM 0.0000386 CC STP 1056 1 1747.47 35 hornblende conventional K-Ar L73 "4.72E-04, 0.584E-04, 1.19E-04*" 1.013 43 93 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.844% AND 0.838% K; ARGON VALUE IS CONVERTED FROM 0.0000964 CC 1056 2 1757.85 35 hornblende conventional K-Ar L73 "4.72E-04, 0.584E-04, 1.19E-04*" 1.013 43.4 96 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FORM AVERAGED 0.844% AND 0.838% K; ARGON VALUE IS CONVERTED FROM 0.0000973 CC STP 1056 3 1755.26 35 hornblende conventional K-Ar L73 "4.72E-04, 0.584E-04, 1.19E-04*" 1.013 43.3 92 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.844% AND 0.838% K; ARGON VALUE IS CONVERTED FROM 0.0000971 CC STP 1057 1 1716.76 34 hornblende conventional K-Ar L74 "4.72E-04, 0.584E-04, 1.19E-04*" 0.402 16.6 90 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.328% AND 0.339% K; ARGON VALUE IS CONVERTED FROM 0.0000372 CC 1057 2 1703.37 34 hornblende conventional K-Ar L74 "4.72E-04, 0.584E-04, 1.19E-04*" 0.402 16.4 75 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.328% AND 0.339% K; ARGON VALUE IS CONVERTED FROM 0.0000367 CC STP 1058 1 1742.99 35 hornblende conventional K-Ar L75 "4.72E-04, 0.584E-04, 1.19E-04*" 0.395 16.7 88 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.328% AND 0.327% K; ARGON VALUE IS CONVERTED FROM 0.0000374 CC 1058 2 1762.95 35 hornblende conventional K-Ar L75 "4.72E-04, 0.584E-04, 1.19E-04*" 0.395 17 95 age of later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.328% AND 0.327% K; ARGON VALUE IS CONVERTED FROM 0.0000380 CC STP 1059 1 1706.42 34 hornblende conventional K-Ar L76 "4.72E-04, 0.584E-04, 1.19E-04*" 0.396 16.2 94 age of later metamorphism -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED FROM 0.333%, 0.325%, AND 0.328% K; ARGON VALUE IS CONVERTED FROM 0.0000362 CC" 1059 2 1685.87 34 hornblende conventional K-Ar L76 "4.72E-04, 0.584E-04, 1.19E-04*" 0.396 15.9 71 age of later metamorphism -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.333%, 0.325%, AND 0.328% K; ARGON VALUE IS CONVERTED FROM 0.0000357 CC STP" 1060 1 1358.31 27 hornblende conventional K-Ar L80 "4.72E-04, 0.584E-04, 1.19E-04*" 1.45 42.3 98 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGE OF 1.21% AND 1.19% K; ARGON VALUE IS CONVERTED FROM 0.0000948 CC 1061 1 1353.25 27 biotite conventional K-Ar L82 "4.72E-04, 0.584E-04, 1.19E-04*" 6.72 195 98 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 5.55% AND 5.61% K; ARGON VALUE IS CONVERTED FROM 0.000436 CC 1062 1 1374.89 27 hornblende conventional K-Ar L82 "4.72E-04, 0.584E-04, 1.19E-04*" 1.57 46.6 97 age of intrusion -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 1.30% AND 1.31% K; ARGON VALUE IS CONVERTED FROM 0.0001045 CC 1063 1 1380.6 27 biotite conventional K-Ar M40A "4.72E-04, 0.584E-04, 1.19E-04*" 8.44 252 96 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.95% AND 7.07% K; ARGON IS CONVERTED FROM 0.000564 CC 1064 1 1329.06 26 biotite conventional K-Ar M45 "4.72E-04, 0.584E-04, 1.19E-04*" 7.99 226 97 initial age disturbed by later metamorphism 40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.65% AND 6.62% K; ARGON VALUE IS CONVERTED FROM 0.000506 CC 1065 1 1301.68 26 biotite conventional K-Ar M48 "4.72E-04, 0.584E-04, 1.19E-04*" 2.05 56.31 85 minimum age of intrusion MAINLY CHLORITE IN THE -40 +60 MESH ANALYZED MATERIAL "POTASSIUM VALUE IS CONVERTED FROM AVERAGED 1.72%, 1.68% AND 1.70% K; ARGON VALUE IS CONVERTED FROM 0.0001262 CC" 1065 2 1265.25 25 biotite conventional K-Ar M48 "4.72E-04, 0.584E-04, 1.19E-04*" 2.05 54.12 95 minimum age of intrusion MAINLY CHLORITE IN THE -40 +60 MESH ANALYZED MATERIAL "POTASSIUM VALUE IS CONVERTED FROM AVERAGED 1.72%, 1.68%, AND 1.70% K; ARGON VALUE IS CONVERTED FROM 0.0001213 CC STP" 1066 1 1401.95 28 biotite conventional K-Ar M61D "4.72E-04, 0.584E-04, 1.19E-04*" 8.42 257 97 initial age disturbed by later metamorphism -40 +60 MESH MATERIAL POTASSIUM VALUE IS CONVERTED FROM AVERAGED 6.99% AND 6.99% K; ARGON VALUE IS CONVERTED FROM 0.000575 CC 1067 1 1689.64 34 hornblende conventional K-Ar M80 "4.72E-04, 0.584E-04, 1.19E-04*" 0.345 13.9 86 age of later metamorphism -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.289%, 0.269% AND 0.300% K; ARGON VALUE IS CONVERTED FROM 0.0000312 CC" 1067 2 1705.36 34 hornblende conventional K-Ar M80 "4.72E-04, 0.584E-04, 1.19E-04*" 0.345 14.1 97 age of later metamorphism -40 +60 MESH MATERIAL "POTASSIUM VALUE IS CONVERTED FROM AVERAGED 0.289%, 0.269%, AND 0.300% K; ARGON VALUE IS CONVERTED FROM 0.0000315" 1068 1 1627.62 32 hornblende conventional K-Ar M81 "4.72E-04, 0.584E-04, 1.19E-04*" 2.37 90.18 96 age of later metamorphism -40 +60 MESH MATERIAL CONTAINED TRACES OF BIOTITE AND CHLORITE "POTASSIUM VALUE IS CONVERTED FROM AVERAGED 1.99%, 1.92% AND 2.00% K; ARGON VALUE IS CONVERTED FROM 0.0002021 CC" 1073 1 58 glauconite conventional K-Ar G-3221 "4.72E-04, 0.585E-04, 1.19E-04" 7.48 68 maximum age of volcanism AR-40/K-40 RATIO EQUALS 0.00346; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 6.21% K 1074 1 393 glauconite conventional K-Ar G-3222 "4.72E-04, 0.585E-04, 1.19E-04" 6.69 95 AR-40/K-40 RATIO EQUALS 0.0256; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 5.78% K AGE IS TOO YOUNG 1075 1 451 glauconite conventional K-Ar G-3223 "4.72E-04, 0.584E-04, 1.19E-04" 6.48 95 AR-40/K-40 RATIO EQUALS 0.0298; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 5.38% K. AGE IS TOO YOUNG 1076 1 439 glauconite conventional K-Ar G-3227 "4.72E-04, 0.585E-04, 1.19E-04" 7 97 AR-40/K-40 RATIO EQUALS 0.0289; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 5.81% K AGE IS TOO YOUNG 1077 1 90 10 glauconite conventional K-Ar G-3242 "4.72E-04, 0.585E-04, 1.19E-04" 7.05 80 age of volcanism AR-40/K-40 RATIO EQUALS 0.0055; POTASSIUM VALUE IS CONVERTED 5.85% K. 1078 1 50 glauconite conventional K-Ar G-3261 "4.72E-04, 0.585E-04, 1.19E-04" 4.36 age of volcanism AR-40/K-40 RATIO IS 0.0029; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 3.62% K. 1078 2 Unk "4.72E-04, 0.585E-04, 1.19E-04" 74 1079 1 459 glauconite conventional K-Ar G-6267 "4.72E-04, 0.585E-04, 1.19E-04" 6.9 94 AR-40/K-40 RATIO EQUALS 0.0304; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 5.73% K AGE IS TOO YOUNG 1080 1 330 glauconite conventional K-Ar G-3268 "4.72E-04, 0.585E-04, 1.19E-04" 5.83 93 POTASSIUM VALUE IS CONVERTED 4.84% K; AR-40/K-40 RATIO IS 0.211; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1081 1 247 glauconite conventional K-Ar G-3277 "4.72E-04, 0.585E-04, 1.19E-04" 4.26 79 AR-40/K-40 RATIO IS 0.0155; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE IS CONVERTED 3.54% K AGE IS TOO YOUNG 1082 1 421 glauconite conventional K-Ar G-3280 "4.72E-04, 0.585E-04, 1.19E-04" 8.1 98 99% GLAUCONITE AR-40/K-40 RATIO EQUALS 0.276; NO ANALYTICAL ERROR GIVEN; POTASSIUM VALUE CONVERTED FROM 6.72% K AGE IS TOO YOUNG 1082 2 435 glauconite conventional K-Ar G-3280 (2) "4.72E-04, 0.585E-04, 1.19E-04" 8.11 91 GLAUCONITE LEACHED WITH 25% ACETIC ACID FOR 24 HOURS BEFORE ANALYSIS POTASSIUM VALUE CONVERTED FROM 6.73% K; AR-40/K-40 RATIO IS 0.0286; NO ANALYTICAL ERROR GIVEN. AGE IS TOO YOUNG 1082 3 432 glauconite conventional K-Ar G-3280 (4) "4.72E-04, 0.585E-04, 1.19E-04" 8.05 96 GLAUCONITE HEATED AT 100 DEGREES C IN AIR FOR 24 HOURS BEFORE ANALYSIS POTASSIUM VALUE IS CONVERTED 6.68% K; AR-40/K-40 RATIO IS 0.0284; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1082 4 433 glauconite conventional K-Ar G-3280 (4) "4.72E-04, 0.585E-04, 1.19E-04" 8.05 95 GLAUCONITE HEATED AT 100 DEGREES C IN AIR FOR 24 HOURS BEFORE ANALYSIS POTASSIUM VALUE IS CONVERTED 6.68% K; AR-40/K-40 RATIO IS 0.0285; NO ANALYTICAL ERROR GIVEN. AGE IS TOO YOUNG 1082 5 420 glauconite conventional K-Ar G-3280 (4) "4.72E-04, 0.585E-04, 1.19E-04" 8.05 97 GLAUCONITE HEATED AT 100 DEGREES C IN AIR FOR 24 HOURS BEFORE ANALYSIS POTASSIUM VALUE IS CONVERTED 6.68% K; AR-40/K-40 RATIO IS 0.0274; NO ANALYTICAL ERROR GIVEN. AGE IS TOO YOUNG; SEE RECORD 1186 FOR SIXTH K-AR AGE 1083 1 436 glauconite conventional K-Ar G-3281 "4.72E-04, 0.585E-04, 1.19E-04" 8.18 98 POTASSIUM VALUE IS CONVERTED 6.79% K; AR-40/K-40 RATIO IS 0.0287; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1084 1 422 glauconite conventional K-Ar G-3282 "4.72E-04, 0.585E-04, 1.19E-04" 7.58 96 POTASSIUM VALUE IS CONVERTED 6.29% K; AR-40/K-40 RATIO IS 0.0277; NO ANALYTICAL ERROR GIVEN. AGE IS TOO YOUNG 1085 1 411 15 glauconite conventional K-Ar G-3283 "4.72E-04, 0.585E-04, 1.19E-04" 7.58 97 POTASSIUM VALUE IS CONVERTED 6.29% K; AR-40/K-40 RATIO IS 0.0269 AGE &S TOO 0OU-G 1086 1 434 glauconite conventional K-Ar G-3286 "4.72E-04, 0.585E-04, 1.19E-04" 7.37 95 POTASSIUM VALUE IS CONVERTED 6.12% K; AR-40/K-40 RATIO IS 0.0285; NO ANALYTICAL ERROR GIVEN AGE TOO YOUNG 1087 1 455 glauconite conventional K-Ar G-3287 "4.72E-04, 0.585E-04, 1.19E-04" 7.11 96 POTASSIUM VALUE IS CONVERTED 5.90% K; AR-40/K-40 RATIO IS 0.300; NO ANALYTICAL ERROR GIVEN AGE TOO YOUNG 1087 2 447 glauconite conventional K-Ar G-3287 "4.72E-04, 0.585E-04, 1.19E-04" 7.11 91 POTASSIUM VALUE IS CONVERTED 5.90% K; AR-40/K-40 RATIO IS 0.0295; NO ANALYTICAL ERROR GIVEN AGE TOO YOUNG 1088 1 423 glauconite conventional K-Ar G-3288 "4.72E-04, 0.585E-04, 1.19E-04" 5.69 96 POTASSIUM VALUE IS CONVERTED 4.72% K; AR-40/K-40 RATIO IS 0.0277; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1089 1 423 glauconite conventional K-Ar G-3578 "4.72E-04, 0.585E-04, 1.19E-04" 5.69 97 POTASSIUM VALUE IS CONVERTED 4.72% K; AR-40/K-40 RATIO IS 0.0277; NO ANALYTICAL ERROR GIVEN AGE TOO YOUNG 1090 1 448 glauconite conventional K-Ar G-3580 "4.72E-04, 0.585E-04, 1.19E-04" 6.73 96 POTASSIUM VALUE IS CONVERTED 5.59% K; AR-40/K-40 RATIO IS 0.0296; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1091 1 427 glauconite conventional K-Ar G-8532 "4.72E-04, 0.585E-04, 1.19E-04" 7.32 98 POTASSIUM VALUE IS CONVERTED 6.08% K; AR40/K-40 RATIO IS 0.0280; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1092 1 417 glauconite conventional K-Ar G-3583 "4.72E-04, 0.585E-04, 1.19E-04" 4.16 83 POTASSIUM VALUE IS CONVERTED 3.45% K; AR-40/K-40 RATIO IS 0.0273; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1093 1 284 30 glauconite conventional K-Ar G-3585 "4.72E-04, 0.585E-04, 1.19E-04" 5.83 34 POTASSIUM VALUE IS CONVERTED 4.84% K; AR-40/K-40 RATIO IS 0.0180 AGE IS TOO YOUNG 1094 1 278 12 glauconite conventional K-Ar G-3586 "4.72E-04, 0.585E-04, 1.19E-04" 5.4 81 POTASSIUM VALUE IS CONVERTED 4.48% K; AR-40/K-40 RATIO IS 0.0176 AGE IS TOO YOUNG 1094 2 250 glauconite conventional K-Ar G-3586 "4.72E-04, 0.585E-04, 1.19E-04" 5.4 88 POTASSIUM VALUE IS CONVERTED 4.48% K; AR-40/K-40 RATIO IS 0.0157; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1094 3 260 glauconite conventional K-Ar G-3586 "4.72E-04, 0.585E-04, 1.19E-04" 5.4 85 POTASSIUM VALUE IS CONVERTED 4.48% K; AR-40/K-40 RATIO IS 0.0164; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1095 1 60 glauconite conventional K-Ar G-3694 "4.72E-04, 0.585E-04, 1.19E-04" 6.41 45 minimum age of intrusion POTASSIUM VALUE IS CONVERTED 5.32% K; AR-40/K-40 RATIO IS 0.00346; NO ANALYTICAL ERROR GIVEN 1096 1 410 glauconite conventional K-Ar G-3347 "4.72E-04, 0.585E-04, 1.19E-04" 3.63 100 POTASSIUM VALUE IS CONVERTED 3.01% K; AR-40/K-40 RATIO IS 0.0272; NO ANALYTICAL ERROR GIVEN AGE IS TOO YOUNG 1108 1 2098.79 80 biotite conventional K-Ar M 5238A "4.72E-04, 0.584E-04, 1.18E-04*" 9.36 535 91 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.34 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.88% AND 7.66% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.0012 AND 0.0012 CC; OTHER RADIOGENIC ARGON VALUE IS 97%. SAMPLE COLLECTED 3.0 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1108 2 1159.22 50 K feldspar conventional K-Ar M 5238A "4.72E-04, 0.584E-04, 1.18E-04*" 10.38 243 93 initial age disturbed by later metamorphism ARGON VALUE IS CONVERTED AVERAGE OF 0.000532 AND 0.000558 CC; OTHER RADIOGENIC ARGON VALUE IS 97%; POTASSIUM VALUE IS CONVERTED 8.62% K SAMPLE COLLECTED 3.0 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1109 1 2058.49 80 biotite conventional K-Ar M 5240A "4.72E-04, 0.584E-04, 1.18E-04*" 8.55 473 97 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 1.8 MM POTASSIUM VALUE IS CONVERTED 7.10% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00103 AND 0.0010 CC; OTHER RADIOGENIC VALUE IS 98% SAMPLE COLLECTED 2.9 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1109 2 2083.76 80 biotite conventional K-Ar M 5240A "4.72E-04, 0.584E-04, 1.18E-04*" 10.59 598 98 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.95 MM ARGON VALUE IS CONVERTED AVERAGE OF 0.00137 AND 0.00131 CC; POTASSIUM VALUE IS CONVERTED 8.79% K (THIS IS A VERY HIGH VALUE FOR PATASSIUM CONTENT FOR BIOTITE--COMPILER.) SAMPLE COLLECTED 2.9 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1109 3 1887.79 80 biotite conventional K-Ar M 5240A "4.72E-04, 0.584E-04, 1.18E-04*" 9.17 440 49 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.41 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.85% AND 7.38% K; ARGON VALUE IS CONVERTED 0.000987 CC SAMPLE COLLECTED 2.9 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1109 4 1512.2 60 biotite conventional K-Ar M 5240A "4.72E-04, 0.584E-04, 1.18E-04*" 8.45 288 96 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.17 MM "POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.00% AND 7.03% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000624, 0.000662, AND 0.000653 CC; OTHER RADIOGENIC ARGON VALUES ARE 97% AND 97%." SAMPLE COLLECTED 2.9 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT. 1109 5 1910 80 biotite conventional K-Ar M 5240A "4.72E-04, 0.584E-04, 1.18E-04" initial age disturbed by later metamorphism BIOTITE GROUND FROM A MEAN GRAIN DIAMETER OF 0.41 MM TO 0.18 MM NO ANALYTICAL DATA GIVEN SAMPLE COLLECTED 2.9 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1110 1 2381.18 100 biotite conventional K-Ar M 5243 "4.72E-04, 0.584E-04, 1.18E-04*" 8.52 607 99 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.53 MM "POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.05%, 7.07%, AND 7.09% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00141 AND 0.00132 CC; THE OTHER RADIOGENIC ARGON VALUE IS 99%." SAMPLE COLLECTED 3.5 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1114 1 1166.61 50 biotite conventional K-Ar M 5252 "4.72E-04, 0.584E-04, 1.18E-04*" 6.31 149 89 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.40 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 5.37% AND 5.11% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000325; 0.000331; AND 0.000345 CC; OTHER RADIOGENIC ARGON VALUES ARE 92% AND 92% SAMPLE COLLECTED 2.1 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1114 2 1222.58 50 K feldspar conventional K-Ar M 5252 "4.72E-04, 0.584E-04, 1.18E-04*" 14.22 358 90 initial age disturbed by later metamorphism ARGON VALUE IS CONVERTED AVERAGE OF 0.000786 AND 0.000817 CC; OTHER RADIOGENIC ARGON VALUE IS 97%; POTASSIUM VALUE IS CONVERTED 11.80% K SAMPLE COLLECTED 2.1 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1115 1 1117.21 40 biotite conventional K-Ar M5254 "4.72E-04, 0.584E-04, 1.18E-04*" 8.62 192 98 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.36 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.03% AND 7.28% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000426 AND 0.000433 CC SAMPLE COLLECTED 0.06 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1116 1 1674.14 70 biotite conventional K-Ar M5299 "4.72E-04, 0.584E-04, 1.18E-04*" 8.66 344 97 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.26 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.21% AND 7.17% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000770 AND 0.000771 CC; OTHER RADIOGEN ARGON VALUE IS 98% SAMPLE COLLECTED 2.7 KM FROM INFERRED DULUTH GABBRO-KNIFE LAKE METASEDIMENT CONTACT 1116 2 1320.66 50 biotite conventional K-Ar M5299G "4.72E-04, 0.584E-04, 1.18E-04*" 7.17 201 99 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.12 MM ARGON VALUE IS CONVERTED 0.000450 CC; POTASSIUM VALUE IS CONVERTED 5.95% K SAMPLE COLLECTED 2.7 KM FROM INFERRED DULUTH GABBRO-KNIFE LAKE METASEDIMENT CONTACT 1117 1 1775.22 70 biotite conventional K-Ar M7001 "4.72E-04, 0.584E-04, 1.18E-04*" 8.55 372 97 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.80 MM POTASSIUM VALUE IS CONVERTED 7.10% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000851 AND 0.000816 CC; OTHER RADIOGENIC ARGON VALUE IS 95% SAMPLE COLLECTED 2.4 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1118 1 1281.4 50 biotite conventional K-Ar M7003 "4.72E-04, 0.584E-04, 1.18E-04*" 8.82 237 93 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.80 MM ARGON VALUE IS CONVERTED 0.000531 CC; POTASSIUM VALUE IS CONVERTED 7.32% K SAMPLE COLLECTED 2.2 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1119 1 1615.52 60 biotite conventional K-Ar M7007 "4.72E-04, 0.584E-04, 1.18E-04*" 7.15 269 98 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.38 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 6.00% AND 5.87% K; ARGON VALUE IS CONVERTED 0.000603 CC SAMPLE COLLECTED 2.3 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1120 1 1909.89 80 biotite conventional K-Ar M7011 "4.72E-04, 0.584E-04, 1.18E-04*" 9.04 442 97 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.55 MM POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.54% AND 7.47% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000990 AND 0.000992 CC; OTHER RADIOGENIC ARGON VALUE IS 99% SAMPLE COLLECTED 2.6 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1120 2 1392.24 60 K feldspar conventional K-Ar M7011 "4.72E-04, 0.584E-04, 1.18E-04*" 10.49 317 93 initial age disturbed by later metamorphism POTASSIUM VALUE IS CONVERTED AVERAGE OF 8.40% AND 9.02% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000703 AND 0.000718 CC; OTHER RADIOGENIC ARGON VALUE IS 98% SAMPLE COLLECTED 2.6 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1121 1 1133.08 50 biotite conventional K-Ar M7018 "4.72E-04, 0.584E-04, 1.18E-04*" 8.37 190 92 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.54 MM "POTASSIUM VALUE IS CONVERTED 6.95% K; ARGON VALUE IS CONVERTED AVERAGED 0.000430, 0.000423, AND 0.000427 CC; OTHER RADIOGENIC ARGON VALUES ARE 98% AND 97%" SAMPLE COLLECTED 2.1 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1123 1 1077.35 40 biotite conventional K-Ar M7030 "4.72E-04, 0.584E-04, 1.18E-04*" 8.2 174 97 initial age disturbed by later metamorphism MEAN GRAIN DIAMETER IS 0.31 MM ARGON VALUE IS CONVERTED 0.000391 CC; POTASSIUM VALUE IS CONVERTED 6.81% K AGE IS PROBABLY SAME AS AGE OF DULUTH GABBRO; SAMPLE COLLECTED 1.7 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1124 1 2524.14 100 hornblende conventional K-Ar M7032 "4.72E-04, 0.584E-04, 1.18E-04*" 0.704 55.8 94 minimum age of intrusion ARGON VALUE IS CONVERTED 0.000125 CC; POTASSIUM VALUE IS CONVERTED 0.584% K SAMPLE COLLECTED 2.1 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1125 1 2595.42 100 biotite conventional K-Ar M7041B "4.72E-04, 0.584E-04, 1.18E-04*" 7.88 658 99 age of intrusion MEAN GRAIN DIAMETER IS 3.16 MM POTASSIUM VALUE IS CONVERTED 6.54% K; ARGON VALUE IS CONVERTED AVERAGED 0.00151 AND 0.00144 CC; OTHER RADIOGENIC ARGON VALUE IS 99%; RUBIDIUM CONTENT IS 453 PPM SAMPLE COLLECTED 4.7 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1126 1 2565.48 100 biotite conventional K-Ar M7058 "4.72E-04, 0.584E-04, 1.18E-04*" 9.29 759 99 age of intrusion MEAN GRAIN DIAMETER IS 0.34 MM POTASSIUM VALUE IS CONVERTED 7.71% K; ARGON VALUE IS CONVERTED AVERAGED 0.00172 AND 0.00168 CC; OTHER RADIOGENIC ARGON VALUE IS 99% SAMPLE COLLECTED 5.0 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1126 2 1564.59 60 K feldspar conventional K-Ar M7058 "4.72E-04, 0.584E-04, 1.18E-04*" 11.91 427 98 ARGON VALUE IS CONVERTED 0.000958 CC; RUBIDIUM CONTENT IS 178 PPM; POTASSIUM VALUE IS CONVERTED 9.89% K K-FELDSPAR DOES NOT QUANTITATIVELY RETAIN RADIOGENIC ARGON; SAMPLE COLLECTED 5.0 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1127 1 2425.81 100 muscovite conventional K-Ar M7031B "4.72E-04, 0.584E-04, 1.18E-04*" 10.41 767 99 initial age disturbed by later metamorphism POTASSIUM VALUE IS CONVERTED 8.64% K; ARGON VALUE IS CONVERTED AVERAGED 0.00171 AND 0.00173 CC; ANOTHER RADIOGENIC ARGON VALUE IS 98% SAMPLE COLLECTED 1.75 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1128 1 2594.54 100 muscovite conventional K-Ar M7045A "4.72E-04, 0.584E-04, 1.18E-04*" 8.64 721 98 age of intrusion POTASSIUM VALUE IS CONVERTED 7.17% K; ARGON VALUE IS CONVERTED AVERAGED 0.00162 AND 0.00161 CC; ANOTHER RADIOGENIC ARGON VALUE IS 99% SAMPLE COLLECTED 5.0 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1129 1 1543.03 60 K feldspar conventional K-Ar M7046 "4.72E-04, 0.584E-04, 1.18E-04*" 4.67 164 95 POTASSIUM VALUE IS CONVERTED 3.88% K; ARGON VALUE IS CONVERTED AVERAGED 0.000364 AND 0.000373 CC; ANOTHER RADIOGENIC ARGON VALUE IS 97% AGE TOO YOUNG; SAMPLE COLLECTED 4.3 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1130 1 2462.01 100 muscovite conventional K-Ar M7047 "4.72E-04, 0.584E-04, 1.18E-04*" 10.37 785 99 initial age disturbed by later metamorphism ARGON VALUE IS CONVERTED 0.00176 CC; POTASSIUM VALUE IS CONVERTED 8.61% K SAMPLE COLLECTED 3.25 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1131 1 1854.04 70 muscovite conventional K-Ar M7061 "4.72E-04, 0.584E-04, 1.18E-04*" 9.74 454 98 initial age disturbed by later metamorphism POTASSIUM VALUE IS CONVERTED AVERAGE OF 7.99% AND 8.18% K; ARGON VALUE IS CONVERTED AVERAGED 0.000985 AND 0.00105 CC; ANOTHER RADIOGENIC ARGON VALUE IS 99% SAMPLE COLLECTED 1.25 KM FROM INFERRED DULUTH GABBRO OVERHEAD CONTACT 1132 1 2776.33 110 hornblende conventional K-Ar M5287 "4.72E-04, 0.584E-04, 1.18E-04*" 0.606 57.6 96 maximum age of intrusion ARGON VALUE IS CONVERTED 0.000129 CC; POTASSIUM VALUE IS CONVERTED 0.503% K SAMPLE COLLECTED 1.8 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1133 1 1755.3 70 hornblende conventional K-Ar M7028 "4.72E-04, 0.584E-04, 1.18E-04*" 0.641 27.4 94 initial age disturbed by later metamorphism ARGON VALUE IS CONVERTED 0.0000614 CC; POTASSIUM VALUE IS CONVERTED 0.532% K SAMPLE COLLECTED 0.35 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1134 1 1444.56 60 hornblende conventional K-Ar M7069 "4.72E-04, 0.584E-04, 1.18E-04*" 0.299 9.53 76 initial age disturbed by later metamorphism 10% PYROXENE IMPURITY POTASSIUM VALUE IS CONVERTED 0.248% K; ARGON VALUE IS CONVERTED AVERAGED 0.0000224 AND 0.0000203 CC; ANOTHER RADIOGENIC ARGON VALUE IS 82%; AGE CORRECTED FOR 10% PYROXENE IMPURITY--AGE IS 1450 M.Y. UNCORECTED SAMPLE COLLECTED AT DULUTH-SNOWBANK STOCK CONTACT 1134 2 1064.74 40 K feldspar conventional K-Ar M7069 "4.72E-04, 0.584E-04, 1.18E-04*" 3.48 72.7 96 initial age disturbed by later metamorphism ARGON VALUE IS CONVERTED 0.000163 CC; POTASSIUM VALUE IS CONVERTED 2.89% K SAMPLE COLLECTED AT DULUTH GABBRO-SNOWBANK STOCK CONTACT 1134 3 2955.88 120 pyroxenes conventional K-Ar M7069 "4.72E-04, 0.584E-04, 1.18E-04*" 0.07 7.54 88 "sample contains excess radiogenic argon, age is too old" ARGON VALUE IS CONVERTED 0.0000169 CC; POTASSIUM VALUE IS CONVERTED 0.058% K SAMPLE COLLECTED AT DULUTH GABBRO-SNOWBANK STOCK CONTACT 1135 1 1762.69 70 hornblende conventional K-Ar M7080 "4.72E-04, 0.584E-04, 1.18E-04*" 0.251 10.8 92 initial age disturbed by later metamorphism POTASSIUM VALUE IS CONVERTED 0.208% K; ARGON VALUE IS CONVERTED AVERAGED 0.0000237 AND 0.0000245 CC; ANOTHER RADIOGENIC ARGON VALUE IS 96% SAMPLE COLLECTED 0.12 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1136 1 1062.91 40 K feldspar conventional K-Ar M5284 "4.72E-04, 0.584E-04, 1.18E-04*" 8.3 173 94 initial age disturbed by later metamorphism ARGON VALUE IS CONVERTED 0.000387 CC; POTASSIUM VALUE IS CONVERTED 6.89% K AGE IS PROBABLY THE SAME AS AGE OF DULUTH GABBRO; SAMPLE COLLECTED 0.9 KM FROM INFERRED DULUTH GABBRO-SNOWBANK STOCK CONTACT 1137 1 37.81 1 biotite conventional K-Ar L-969 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 4.89 86 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 7.38% K 1138 1 105.12 3 hornblende conventional K-Ar L-958 "4.72E-04, 0.585E-04, 1.19E-04*" 1.54 2.4 87 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 1.28% K 1139 1 111.07 3 hornblende conventional K-Ar L-959 "4.72E-04, 0.585E-04, 1.19E-04*" 1.34 2.21 62 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 1.11% K 1140 1 111.28 3 hornblende conventional K-Ar L-961 "4.72E-04, 0.585E-04, 1.19E-04*" 0.829 1.37 89 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 0.688% K 1141 1 109.35 4 hornblende conventional K-Ar L-960 "4.72E-04, 0.585E-04, 1.19E-04*" 1.22 1.98 38 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 1.01% K 1142 1 116.84 3 biotite conventional K-Ar L-962 "4.72E-04, 0.585E-04, 1.19E-04*" 6.445 11.2 91 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 5.35% K 1142 2 109.4 3 hornblende conventional K-Ar L-962 "4.72E-04, 0.585E-04, 1.19E-04*" 1.01 1.64 90 McDowell (1971) age of intrusion POTASSIUM VALUE IS CONVERTED 0.836% K 1143 1 113.42 3 biotite conventional K-Ar L-1013 "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 15 90 McDowell (1971) POTASSIUM VALUE IS CONVERTED 7.39% K AGE OF HYDROTHERMAL ALTERATION 1144 1 111.12 3 biotite conventional K-Ar L-1014 "4.72E-04, 0.585E-04, 1.19E-04*" 10.06 16.6 96 McDowell (1971) POTASSIUM VALUE IS CONVERTED 8.35% K AGE OF HYDROTHERMAL ALTERATION 1145 1 74.74 2 biotite conventional K-Ar L-957 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 9.58 79 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 7.24% K 1146 1 117.69 3 biotite conventional K-Ar L-1027 "4.72E-04, 0.585E-04, 1.19E-04*" 8.11 14.2 93 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 6.73% K 1146 2 126.46 4 hornblende conventional K-Ar L-1027 "4.72E-04, 0.585E-04, 1.19E-04*" 1.14 2.15 83 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 0.947% K 1147 1 78.58 3 biotite conventional K-Ar L-1028 "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 9.91 89 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 7.11% K 1148 1 44.07 2 biotite conventional K-Ar L-1029 "4.72E-04, 0.585E-04, 1.19E-04*" 8.05 5.17 85 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 6.68% K 1149 1 50.36 2 biotite conventional K-Ar L-1121 "4.72E-04, 0.585E-04, 1.19E-04*" 8.31 6.11 87 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 6.90% K 1150 1 159.21 6 hornblende conventional K-Ar L-1122 "4.72E-04, 0.585E-04, 1.19E-04*" 0.434 1.04 66 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 0.360% K 1151 1 44.62 2 biotite conventional K-Ar L-1123 "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 4.93 79 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 6.29% K 1152 1 39.18 2 biotite conventional K-Ar L-953 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 4.71 84 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 6.86% K 1153 1 42.85 2 biotite conventional K-Ar L-954 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 5.55 72 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 7.38% K 1154 1 61.9 2 biotite conventional K-Ar L-1026 "4.72E-04, 0.585E-04, 1.19E-04*" 9.54 8.65 87 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 7.92% K 1155 1 56.05 2 muscovite conventional K-Ar L-1120 "4.72E-04, 0.585E-04, 1.19E-04*" 10.37 8.5 88 McDowell (1971) age not evaluated POTASSIUM VALUE IS CONVERTED 8.61% K 1156 1 1720 hornblende conventional K-Ar 3798 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN "AGE TAKEN FROM ARTICLE BY BURWASH, BAADSGAARD, AND PETERMAN, 1962" 1156 2 1770 hornblende conventional K-Ar 3798 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN "AGE TAKEN FROM ARTICLE BY BURWASH, BAADSGARRD, AND PETERMAN, 1962" 1160 1 2200 hypersthene conventional K-Ar 4678 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN "AGE TAKEN FROM ARTICLE BY BURWASH, BAADSGAARD, AND PETERMAN, 1962" 1162 1 79.43 2.4 hornblende conventional K-Ar D1564 "4.72E-04, 0.584E-04, 1.19E-04*" 0.988 1.155 90 age of volcanism POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1163 1 79.9 2.4 hornblende conventional K-Ar D1567 "4.72E-04, 0.584E-04, 1.19E-04*" 0.829 0.975 94 age of volcanism POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1163 2 80.14 2.4 hornblende conventional K-Ar D1567 "4.72E-04, 0.584E-04, 1.19E-04*" 0.834 0.984 95 age of volcanism POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1164 1 77.53 3.8 biotite conventional K-Ar S1419 "4.72E-04, 0.584E-04, 1.19E-04*" 9.54 10.88 93 age of intrusion 1164 2 79.2 3.1 biotite conventional K-Ar S1419 "4.72E-04, 0.584E-04, 1.19E-04*" 9.24 10.77 91 age of intrusion REPLICATE POTASSIUM ANALYSES 1165 1 75.27 2.9 biotite conventional K-Ar 605-599 "4.72E-04, 0.584E-04, 1.19E-04*" 8.82 9.76 91 age of intrusion REPLICATE POTASSIUM ANALYSES 1166 1 80.04 3.1 biotite conventional K-Ar 63K-350 "4.72E-04, 0.584E-04, 1.19E-04*" 8.75 10.31 89 age of intrusion REPLICATE POTASSIUM ANALYSES "THIS AGE ALSO REPORTED BY PROSTKA, 1966, USGS BULL. 1221F" 1167 1 74.5 3.6 biotite conventional K-Ar 61K-661 "4.72E-04, 0.584E-04, 1.19E-04*" 8.84 9.68 92 age of intrusion 1168 1 75.63 3.7 biotite conventional K-Ar 61K-647 "4.72E-04, 0.584E-04, 1.19E-04*" 6.79 7.55 82 age of intrusion "THIS AGE ALSO REPORTED BY PROSTKA, 1966, USGS BULL. 1221F" 1168 2 76.43 3 hornblende conventional K-Ar 61K-647 "4.72E-04, 0.584E-04, 1.19E-04*" 0.476 0.535 60 age of intrusion REPLICATE POTASSIUM ANALYSES "THIS AGE ALSO REPORTED BY PROSTKA, 1966, USGS BULL. 1221F" 1169 1 73.35 2.3 biotite conventional K-Ar 63T-273 "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 9.42 96 age of intrusion REPLICATE POTASSIUM AND ARGON ANALYSES 1169 2 73.58 2.2 biotite conventional K-Ar 63T-273 "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 9.45 96 age of intrusion REPLICATE POTASSIUM ANALYSES 1169 3 75.04 2.5 hornblende conventional K-Ar 63T-273 "4.72E-04, 0.584E-04, 1.19E-04*" 0.456 0.503 84 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1169 4 72.96 2.5 hornblende conventional K-Ar 63T-273 "4.72E-04, 0.584E-04, 1.19E-04*" 0.459 0.492 70 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1170 1 74.99 3.6 biotite conventional K-Ar 63K-306 "4.72E-04, 0.584E-04, 1.19E-04*" 7.33 8.08 86 age of intrusion 1170 2 72.89 3.6 hornblende conventional K-Ar 63K-306 "4.72E-04, 0.584E-04, 1.19E-04*" 0.55 0.589 69 age of intrusion REPLICATE POTASSIUM ANALYSES 1171 1 74.39 3 biotite conventional K-Ar D1566 "4.72E-04, 0.584E-04, 1.19E-04*" 9 9.84 74 age of intrusion REPLICATE POTASSIUM ANALYSES 1171 2 78.27 2.4 hornblende conventional K-Ar D1566 "4.72E-04, 0.584E-04, 1.19E-04*" 0.6 0.691 57 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1171 3 76.8 3.4 hornblende conventional K-Ar D1566 "4.72E-04, 0.584E-04, 1.19E-04*" 0.602 0.68 72 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE DILUTION ANALYSES 1172 1 73.59 3.6 biotite conventional K-Ar 52C-45 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 9.84 89 age of intrusion 1172 2 71.75 3.5 biotite conventional K-Ar 52C-45 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 9.59 87 age of intrusion REPLICATE ARGON ANALYSES 1173 1 76.83 3.7 biotite conventional K-Ar 62K00 "4.72E-04, 0.584E-04, 1.19E-04*" 8.61 9.73 86 age of intrusion 1174 1 72.19 3.5 biotite conventional K-Ar 1K-241 "4.72E-04, 0.584E-04, 1.19E-04*" 8.61 9.13 90 age of intrusion 1174 2 73.35 3.3 biotite conventional K-Ar 1K-241 "4.72E-04, 0.584E-04, 1.19E-04*" 8.61 9.28 91 age of intrusion REPLICATE ARGON ANALYSES 1174 3 76.52 2.6 hornblende conventional K-Ar 1K-241 "4.72E-04, 0.584E-04, 1.19E-04*" 0.399 0.449 63 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1175 1 71.7 3.5 biotite conventional K-Ar 60S-C3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.92 8.34 85 age of intrusion 1176 1 71.87 3.5 biotite conventional K-Ar W-21 "4.72E-04, 0.584E-04, 1.19E-04*" 7.91 8.35 86 age of intrusion REPLICATE POTASSIUM ANALYSES 1176 2 75.66 3 biotite conventional K-Ar W-21 "4.72E-04, 0.584E-04, 1.19E-04*" 7.91 8.8 93 age of intrusion REPLICATE POTASSIUM AND ARGON ANALYSES 1176 3 74.88 2.5 hornblende conventional K-Ar W-21 "4.72E-04, 0.584E-04, 1.19E-04*" 0.417 0.459 79 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES 1177 1 71.74 3.5 biotite conventional K-Ar 61K-633 "4.72E-04, 0.584E-04, 1.19E-04*" 8.21 8.65 90 age of intrusion "THIS AGE ALSO REPORTED BY PROSTKA, 1966, USGS BULL. 1221F" 1177 2 75.57 3 hornblende conventional K-Ar 61K-633 "4.72E-04, 0.584E-04, 1.19E-04*" 0.486 0.54 71 age of intrusion POTASSIUM DETERMINED BY REPLICATE ISOTOPE-DILUTION ANALYSES "THIS AGE ALSO REPORTED BY PROSTKA, 1966, USGS BULL. 1221F" 1178 1 72.4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion SAMPLE IS IDENTIFIED AS NO. 6 ON SAMPLE-LOCATION MAP 1179 1 74.71 2.9 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 8.55 9.39 78 McDowell (1971) age of intrusion 1179 2 72.87 2.8 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 8.65 9.26 83 McDowell (1971) age of intrusion 1180 1 78.98 3.1 biotite conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 7.02 8.16 57 McDowell (1971) age of intrusion 1180 2 78.99 3.1 hornblende conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 0.548 0.637 56 McDowell (1971) age of intrusion 1181 1 78.51 3.1 biotite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 6.89 7.96 79 McDowell (1971) age of intrusion 1181 2 78.53 3.1 hornblende conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 0.836 0.966 46 McDowell (1971) age of intrusion 1182 1 77.62 3 biotite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.95 10.22 89 McDowell (1971) age of intrusion 1182 2 74.79 2.9 biotite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.95 9.84 93 McDowell (1971) minimum age of intrusion REPLICATE ARGON ANALYSES 1182 3 83.5 3.3 hornblende conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 0.625 0.769 39 McDowell (1971) maximum age of intrusion 1183 1 76.84 3 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.3 9.38 79 McDowell (1971) age of intrusion 1183 2 76.75 3 hornblende conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.52 0.587 53 McDowell (1971) age of intrusion 1184 1 72.09 2.8 biotite conventional K-Ar 18A "4.72E-04, 0.584E-04, 1.19E-04*" 7.64 8.09 87 McDowell (1971) minimum age of intrusion GRAIN SIZE GREATER THAN 20 MESH 1184 2 71.95 2.8 biotite conventional K-Ar 18A "4.72E-04, 0.584E-04, 1.19E-04*" 5.99 6.33 57 McDowell (1971) minimum age of intrusion GRAIN SIZE BETWEEN 20-80 MESH 1184 3 82.29 3.2 hornblende conventional K-Ar 18A "4.72E-04, 0.584E-04, 1.19E-04*" 0.575 0.697 78 McDowell (1971) maximum age of intrusion 1184 4 80.1 3.1 hornblende conventional K-Ar 18A "4.72E-04, 0.584E-04, 1.19E-04*" 0.575 0.678 13 McDowell (1971) maximum age of intrusion 1185 1 69.52 2.7 biotite conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 8.33 8.5 82 McDowell (1971) age of intrusion 1185 2 70.59 2.8 hornblende conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 1.29 1.337 69 McDowell (1971) age of intrusion 1186 1 435 glauconite conventional K-Ar G-3280 (5) "4.72E-04, 0.585E-04, 1.19E-04" 8.06 98 99% GLAUCONITE "DATA GIVEN AS 6.69% K, 40AR/40K = 0.0286; NO ERROR LISTED" AGE TOO YOUNG; THIS IS THE SIXTH K-AR AGE FOR THE SAME SAMPLE; SEE RECORD #1082 1187 1 156.93 5 biotite conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 7.96 18.79 90 age of intrusion POTASSIUM VALUE CONVERTED FROM 6.61% K; ARGON VALUE CONVERTED FROM 0.0751 PPM. 1188 1 155 8 biotite conventional K-Ar 33 "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 1189 1 12.7 biotite conventional K-Ar KA-1268 "4.72E-04, 0.585E-04, 1.19E-04" 8.256 69 age of volcanism POTASSIUM VALUE IS CONVERTED 6.853% K; ARGON VALUE AND ANALYTICAL ERROR ARE NOT GIVEN 1190 1 206.74 3 hornblende conventional K-Ar YU-N1500 "4.72E-04, 0.584E-04, 1.19E-04*" 0.501 1.58 60 age of intrusion 99% HORNBLENDE HAVING A +100 MESH GRAIN SIZE POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.414% AND 0.418% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00630 AND 0.00635 PPM; OTHER RADIOGENIC ARGON VALUE IS 59% 1191 1 61.76 7 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 5.13 4.64 32 age of intrusion SAMPLE ALSO DESIGNATED S-EPR40850/1010 POTASSIUM VALUE IS CONVERTED 4.26% K; ARGON VALUE IS CONVERTED 0.0000104 CC/G 1192 1 176.54 6 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.64 20.4 68 Ashley (1973) age of intrusion SAMPLE ALSO DESIGNATED S-EPR4085A/875 POTASSIUM VALUE IS CONVERTED 6.34% K; ARGON VALUE IS CONVERTED 0.0000457 CC/G 1193 1 60.91 2 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04*" 7.4 6.6 57 age not evaluated SAMPLE ALSO DESIGNATED S-EPR4083B/SCE637 POTASSIUM VALUE IS CONVERTED 6.14% K; ARGON VALUE IS CONVERTED 0.0000148 CC/G 1194 1 7.83 1.7 whole rock conventional K-Ar Y-B1-14 "4.72E-04, 0.584E-04, 1.19E-04*" 1.16 0.131 4 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.963% AND 0.967% K; ARGON VALUE IS CONVERTED 0.000000294 CC/G 1195 1 8.09 2 whole rock conventional K-Ar Y-B1-17 "4.72E-04, 0.584E-04, 1.19E-04*" 1.2 0.14 1 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.993% AND 1.00% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000000265 AND 0.000000361 CC; OTHER RADIOGENIC ARGON VALUE IS 5% 1196 1 6.99 1.5 whole rock conventional K-Ar Y-B1-2 "4.72E-04, 0.584E-04, 1.19E-04*" 1.23 0.124 4 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.04% AND 1.01% K; ARGON VALUE IS CONVERTED 0.000000278 CC/G 1197 1 8.91 1.5 whole rock conventional K-Ar Y-B1-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.19 0.153 5 maximum age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.999% AND 0.977% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000000325 AND 0.000000363 CC/G; OTHER RADIOGENIC ARGON VALUE IS 5% POSSIBLE EXCESS RADIOGENIC ARGON PRESENT; AGE IS GREATER THAN AGE OF UNDERLYING FLOW 1198 1 6.84 0.1 sanidine conventional K-Ar Y-TSP "4.72E-04, 0.584E-04, 1.19E-04*" 6.76 0.667 56 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 5.60% AND 5.62% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000151 AND 0.00000148 CC/G; OTHER RADIOGENIC ARGON VALUE IS 69%. 1198 2 7 0.14 whole rock conventional K-Ar Y-TSP "4.72E-04, 0.584E-04, 1.19E-04*" 5.04 0.509 62 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 4.15% AND 4.22% K; ARGON VALUE IS CONVERTED 0.00000114 CC/G 1199 1 7.36 0.5 whole rock conventional K-Ar Y-58N264 "4.72E-04, 0.584E-04, 1.19E-04*" 4.88 0.518 13 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 4.02% AND 4.08% K; ARGON VALUE IS CONVERTED 0.00000116 CC/G 1200 1 12.11 0.4 whole rock conventional K-Ar Y-B2-7 "4.72E-04, 0.584E-04, 1.19E-04*" 1.56 0.273 27 age of volcanism "POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.30%, 1.28%, AND 1.31% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.000000633 AND 0.000000589 CC/G; OTHER RADIOGENIC ARGON VALUE IS 36%; INITIAL SR-87/SR-86 RATIO IS 0.7043 +/- 0.0007" 1201 1 13.31 1.2 whole rock conventional K-Ar Y-B2-3 "4.72E-04, 0.584E-04, 1.19E-04*" 1.68 0.323 8 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.40% AND 1.39% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000067 AND 0.00000078 CC/G; OTHER RADIOGENIC ARGON VALUE IS 6% 1202 1 13.8 3 whole rock conventional K-Ar Y-5813 "4.72E-04, 0.584E-04, 1.19E-04*" 0.752 0.15 2 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.617% AND 0.632% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000026 AND 0.00000042 CC/G; OTHER RADIOGENIC ARGON VALUE IS 3%. 1203 1 12.25 0.5 whole rock conventional K-Ar Y-58441 "4.72E-04, 0.584E-04, 1.19E-04*" 2.09 0.37 16 age of volcanism "POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.74%, 1.72%, AND 1.74% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000083 AND 0.00000085 CC/G; OTHER RADIOGENIC ARGON VALUE IS 8%." 1204 1 16.25 2 whole rock conventional K-Ar Y-5780 "4.72E-04, 0.584E-04, 1.19E-04*" 2.43 0.571 5 age of volcanism "POTASSIUM VALUE IS CONVERTED AVERAGE OF 2.03%, 2.00%, AND 2.02% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000124 AND 0.00000132 CC/G; OTHER RADIOGENIC ARGON VALUE IS 5%." 1205 1 18.48 3 whole rock conventional K-Ar Y-57233 "4.72E-04, 0.584E-04, 1.19E-04*" 2.46 0.658 6 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 2.06% AND 2.03% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000146 AND 0.00000149 CC/G; OTHER RADIOGENIC ARGON VALUE IS 3%. 1206 1 19.41 1.5 whole rock conventional K-Ar Y-B3-13 "4.72E-04, 0.584E-04, 1.19E-04*" 1.89 0.531 8 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 1.56% AND 1.58% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000115 AND 0.00000123 CC/G; OTHER RADIOGENIC ARGON VALUE IS 9%; INITIAL SR-87/SR-86 RATIO IS 0.7052 +/- 0.0007 1207 1 22.4 1.1 plagioclase conventional K-Ar Y-58N260 "4.72E-04, 0.584E-04, 1.19E-04*" 0.789 0.256 20 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 0.650% AND 0.660% K; ARGON VALUE IS CONVERTED 0.000000574 CC/G 1207 2 22.35 0.3 biotite conventional K-Ar Y-58N260 "4.72E-04, 0.584E-04, 1.19E-04*" 8.31 2.69 54 age of volcanism POTASSIUM VALUE IS CONVERTED AVERAGE OF 6.90% AND 6.90% K; ARGON VALUE IS CONVERTED AVERAGE OF 0.00000612 AND 0.00000592 CC/G; OTHER RADIOGENIC ARGON VALUE IS 63%. 1208 1 19.57 0.4 adularia conventional K-Ar USGS(M)-TV-1 "4.72E-04, 0.585E-04, 1.19E-04*" 12.07 3.419 83 AGE OF MINERALIZATION 1209 1 20.95 0.6 biotite conventional K-Ar USGS(M)-T219 "4.72E-04, 0.585E-04, 1.19E-04*" 7.71 2.339 69 age of volcanism 1218 1 7.17 0.2 glass conventional K-Ar BLACK BALLS "4.72E-04, 0.585E-04, 1.19E-04*" 4.52 0.4672 37 minimum age of volcanism NONHYDRATED OBSIDIAN 1219 1 8.05 0.2 adularia conventional K-Ar GLA-1 "4.72E-04, 0.585E-04, 1.19E-04*" 12.09 1.405 69 "X-RAY DIFFRACTION ANALYSIS ACCORDING TO THE THREE-REFLECTION METHOD (WRIGHT, 1968) INDICATED A SANIDINE STRUCTURE FOR THE FELDSPAR." AGE OF MINERALIZATION 1220 1 15.53 0.5 biotite conventional K-Ar GL-2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 1.884 66 Silberman and McKee (1972) age of volcanism "AGE IS TOO YOUNG, SEE BIOTITE AGE" 1220 2 14 0.4 plagioclase conventional K-Ar GL-2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.81 0.1639 63 Silberman and McKee (1972) PLAGIOCLASE HAS THIN COATING OF IRON OXIDE ON FRACTURES AND PARTINGS AND HAS GLASS INCLUSIONS. 1221 1 198 4 sericite conventional K-Ar GL-15 "4.72E-04, 0.585E-04, 1.19E-04*" 6.75 20.37 98 age not evaluated 1222 1 80.2 2.3 muscovite conventional K-Ar REDLICH "4.72E-04, 0.585E-04, 1.19E-04*" 10.94 12.92 85 minimum age of intrusion 1223 1 79.22 2.3 biotite conventional K-Ar HALL-B "4.72E-04, 0.585E-04, 1.19E-04*" 6.95 8.103 95 age of intrusion ALSO THE TIME OF MINERALIZATION 1224 1 10.8 0.3 sanidine conventional K-Ar K-1 "4.72E-04, 0.585E-04, 1.19E-04*" 11.66 1.818 79 age of volcanism 1225 1 106.79 2 muscovite conventional K-Ar MG-1 "4.72E-04, 0.585E-04, 1.19E-04*" 10.26 16.25 88 age of intrusion 1226 1 115.77 3 hornblende conventional K-Ar GB-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.84 1.446 85 age not evaluated 1227 1 72.81 1.4 muscovite conventional K-Ar SPR-1 "4.72E-04, 0.585E-04, 1.19E-04*" 11.06 11.83 80 age of intrusion 1228 1 70.99 1.4 biotite conventional K-Ar SPR-1A "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 9.548 82 age of intrusion 1229 1 15.09 0.3 sanidine conventional K-Ar MILLER-1 "4.72E-04, 0.585E-04, 1.19E-04*" 11.6 2.53 8378 age of volcanism ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 1230 1 17.16 0.5 biotite conventional K-Ar USGS(M)-12789-75 "4.72E-04, 0.585E-04, 1.19E-04*" 8.41 2.088 79 age of volcanism MAP LOCATION NO. 79 1230 2 17.21 0.5 hornblende conventional K-Ar USGS(M)-12789-75 "4.72E-04, 0.585E-04, 1.19E-04*" 0.815 0.2029 43 age of volcanism MAP LOCATION NO. 79 ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES; OTHER RADIOGENIC ARGON VALUE IS 42% 1231 1 17.57 0.3 biotite conventional K-Ar USGS(M)-11549-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 2.222 62 Bonham and others (1972) age of volcanism MAP LOCATION NO. 84 1231 2 17.31 0.3 sanidine conventional K-Ar USGS(M)-11549-1 "4.72E-04, 0.585E-04, 1.19E-04*" 11.11 2.782 54 age of volcanism MAP LOCATION NO. 84 1232 1 15.86 1.6 biotite conventional K-Ar AD-34 "4.72E-04, 0.585E-04, 1.19E-04*" 7.05 1.617 10 age of volcanism MAP LOCATION NO. 85 ARGON VALUE IS AVERAGE OF 3 ANALYSES; OTHER RADIOGENIC ARGON VALUES ARE 11% AND 7% 1233 1 14.59 0.3 biotite conventional K-Ar USGS(M)-164-69 "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 1.807 63 age of volcanism MAP LOCATION NO. 97 "AGE OF 14.6+/-2.4 M.Y. ON PLAGIOCLASE REPORTED FOR THIS SAMPLE IN ASHLEY AND SILBERMAN, 1976" 1234 1 18.26 0.4 biotite conventional K-Ar USGS(M)-164-15 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 2.069 38 age of volcanism MAP LOCATION NO. 98 1235 1 4.56 0.2 biotite conventional K-Ar SAMPLE PIGEON SPRING "4.72E-04, 0.585E-04, 1.19E-04*" 5.79 0.381 42 age of volcanism "AGE WAS FIRST PUBLISHED BY MCKEE, E.H., 1968, GEOLOGY OF THE MAGRUDER MOUNTAIN AREA, NEVADA-CALIFORNIA: U. S. GEOL. SURVEY BULL. 1251-H, ON PAGE H26, BUT NO LOCATION OR ANALYTICAL DATA GIVEN." 1236 1 15.47 0.6 biotite conventional K-Ar GILBERT "4.72E-04, 0.585E-04, 1.19E-04*" 8.12 1.816 66 Silberman and others (1975) age of volcanism MAP LOCATION NO. 67 "AGE ALSO PUBLISHED BY ALBERS, J.P., AND STEWART, J.H., 1972, GEOLOGY AND MINERAL DEPOSITS OF ESMERALDA COUNTY, NEVADA: NEVADA BUR. MINES AND GEOLOGY BULL., NO. 78." 1237 1 16.6 0.4 sanidine conventional K-Ar 659-66 "4.72E-04, 0.585E-04, 1.19E-04*" 10.9 2.617 94 age of volcanism MAP LOCATION NO. 86 "AGE ALSO PUBLISHED BY ALBERS, J.P., AND STEWART, J.H., 1972, GEOLOGY AND MINERAL DEPOSITS OF ESMERALDA COUNTY, NEVADA: NEVADA BUR. MINES AND GEOLOGY BULL., NO. 78." 1237 2 16.66 0.4 biotite conventional K-Ar 659-66 "4.72E-04, 0.585E-04, 1.19E-04*" 7.77 1.872 62 age of volcanism MAP LOCATION NO. 86 "AGE ALSO PUBLISHED BY ALBERS, J.P., AND STEWART, J.H., 1972, GEOLOGY AND MINERAL DEPOSITS OF ESMERALDA COUNTY, NEVADA: NEVADA BUR. MINES AND GEOLOGY BULL., NO. 78." 1238 1 22.15 0.5 biotite conventional K-Ar 97VV-5 "4.72E-04, 0.585E-04, 1.19E-04*" 5.65 1.813 75 age of volcanism MAP LOCATION NO. 102 "AGE ALSO PUBLISHED BY ALBERS, J.P., AND STEWART, J.H., 1972, GEOLOGY AND MINERAL DEPOSITS OF ESMERALDA COUNTY, NEVADA: NEVADA BUR. MINES AND GEOLOGY BULL. NO. 78." 1238 2 21.3 0.7 augite-ferroaugite conventional K-Ar 97VV-5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.962 0.2967 54 age of volcanism MAP LOCATION NO. 102 "AGE ALSO PUBLISHED BY ALBERS, J.P., AND STEWART, J.H., 1972, GEOLOGY AND MINERAL DEPOSITS OF ESMERALDA COUNTY, NEVADA: NEVADA BUR. MINES AND GEOLOGY BULL. NO. 78." 1239 1 22.01 0.5 augite-ferroaugite conventional K-Ar 97VV-299 "4.72E-04, 0.585E-04, 1.19E-04*" 0.853 0.272 58 age of volcanism "AGE ALSO PUBLISHED BY ALBERS, J.P., AND STEWART, J.H., 1972, GEOLOGY AND MINERAL DEPOSITS OF ESMERALDA COUNTY, NEVADA: NEVADA BUR. MINES AND GEOLOGY BULL. NO. 78." 1240 1 21.1 0.4 biotite conventional K-Ar 228-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.465 2.587 53 age of volcanism POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES. 1240 2 21.17 0.4 sanidine conventional K-Ar 228-1 "4.72E-04, 0.585E-04, 1.19E-04*" 12.3 3.771 89 age of volcanism REPLICATE POTASSIUM ANALYSES 1241 1 21.73 0.4 biotite conventional K-Ar Y-47 "4.72E-04, 0.585E-04, 1.19E-04*" 8.23 2.59 76 Ashley (1973) age of volcanism POTASSIUM VALUE IS AVERAGE OF FOUR DETERMINATIONS 1242 1 21.89 0.4 biotite conventional K-Ar 203-11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 2.67 74 Ashley (1973) age of volcanism POTASSIUM VALUE IS AVERAGE OF FOUR ANALYSES 1243 1 21.27 0.4 alunite conventional K-Ar 199-127 "4.72E-04, 0.585E-04, 1.19E-04*" 7.97 2.455 49 REPLICATE POTASSIUM ANALYSES "AGE OF MINERALIZATION; AGE OF 21.0 +/- 0.4 REPORTED FOR THIS SAMPLE BASED ON SECOND ARGON ANALYSIS BY ASHLEY AND SILBERMAN, 1976" 1244 1 21.6 0.3 biotite conventional K-Ar 644-3-B "4.72E-04, 0.584E-04, 1.19E-04*" 8.69 2.718 70 age of volcanism MAP LOCATION NO. 29 POTASSIUM VALUE IS CONVERTED 7.21% K; ARGON VALUE COMPUTED BY COMPILER 1245 1 6.27 0.3 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.6 0.778 41 age of volcanism REPLICATE POTASSIUM ANALYSES 1246 1 6.2 0.5 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 0.758 28 age of volcanism REPLICATE POTASSIUM ANALYSES 1247 1 4.95 0.6 whole rock conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 2.55 0.182 8 age of volcanism REPLICATE POTASSIUM ANALYSES 1248 1 6.09 0.2 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 0.728 50 age of volcanism REPLICATE POTASSIUM ANALYSES 1249 1 21.5 1 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1250 1 6.9 0.3 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1251 1 23.34 1 biotite conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 7.88 2.665 63 age of volcanism REPLICATE POTASSIUM ANALYSES 1304 1 0.18 0.01 glass conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism 1305 1 10.7 0.5 whole rock conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism "ANALYICAL DATA NOT PUBLISHED. IT IS GIVEN IN--BUFFLER, R.T., 1967, THE BROWNS PARK FORMATION AND ITS RELATIONSHIP TO THE LATE TERTIARY GEOLOGIC HISTORY OF THE ELKHEAD REGION, NORTHWESTERN COLORADO-SOUTH-CENTRAL WYOMING (PH. D. THESIS): UNIV. CALIFORNIA," 1306 1 69.02 0.7 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 8.48 8.59 93 age of volcanism POTASSIUM CONTENT CONVERTED TO POTASSIUM OXIDE--COMPILER 1307 1 70.12 0.7 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.18 8.42 87 age of volcanism POTASSIUM CONTENT CONVERTED TO POTASSIUM OXIDE--COMPILER 1308 1 96.59 2.6 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 5.81 8.3 96 age of volcanism POTASSIUM CONTENT CONVERTED TO POTASSIUM OXIDE--COMPILER 1308 2 93.61 0.9 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 5.87 8.12 96 age of volcanism POTASSIUM CONTENT CONVERTED TO POTASSIUM OXIDE--COMPILER 1308 3 92.78 0.9 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 5.88 8.06 94 age of volcanism POTASSIUM CONTENT CONVERTED TO POTASSIUM OXIDE--COMPILER 1309 1 94.34 0.9 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 5.25 7.32 90 age of volcanism POTASSIUM CONTENT CONVERTED TO POTASSIUM OXIDE--COMPILER 1310 1 2206.86 110 biotite conventional K-Ar WIND RIVER NO. 1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.52 593 100 minimum age of intrusion 2.37 PPM RADIOGENIC ARGON 1310 2 2629.52 130 hornblende conventional K-Ar WIND RIVER NO. 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.93 79.6 100 age of intrusion SOME BIOTITE PRESENT IN HORNBLENDE CONCENTRATE 0.318 PPM RADIOGENIC ARGON 1311 1 1425.03 70 biotite conventional K-Ar WIND RIVER NO. 2 "4.72E-04, 0.585E-04, 1.19E-04*" 5.12 160 99 age not evaluated 0.641 PPM RADIOGENIC ARGON 1312 1 2.5 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 1313 1 32.2 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 1314 1 33.9 3.4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 1315 1 46.2 1.5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 1316 1 35.8 0.8 biotite conventional K-Ar 71-0-14 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1317 1 43.1 1.1 Unk conventional K-Ar 71-0-12 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1318 1 49.2 0.5 biotite conventional K-Ar L72-132 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1320 1 32 0.9 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) PROBABLY BIOTITE CONCENTRATE NO ANALYTICAL DATA GIVEN 1338 1 0.11 0 glass conventional K-Ar OCB-66-09 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; ANALYTICAL ERROR LISTED AS +/- 0.0026 M.Y. BEST WEIGHTED AGE IS 0.1145 M.Y. 1338 2 0.12 sanidine conventional K-Ar OCB-66-09 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; ANALYTICAL ERROR LISTED AS +/- 0.0024 M.Y. BEST WEIGHTED AGE IS 0.1145 M.Y. 1338 3 0.13 0.06 sanidine conventional K-Ar OCB-66-09 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; ANALYTICAL ERROR LISTED AS +/- 0.059 M.Y. BEST WEIGHTED AGE IS 0.1145 M.Y. 1339 1 0.12 sanidine conventional K-Ar YG-72-5 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; ANALYTICAL ERROR LISTED AS +/- 0.0059 M.Y. BEST WEIGHTED AGE IS 0.1145 M.Y. 1339 2 0.12 glass conventional K-Ar YG-72-5 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; ANALYTICAL ERROR LISTED AS +/- 0.0036 M.Y. BEST WEIGHTED AGE IS 0.1145 M.Y. 1340 1 0.18 0 glass conventional K-Ar OCB-66-06 "4.72E-04, 0.584E-04, 1.19E-04" Friedman and others (1973) age of volcanism NO ANALYTICAL DATA GIVEN 1341 1 2 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1342 1 1.2 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1343 1 0.6 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1344 1 1.6 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1345 1 0.79 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1346 1 0.64 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1347 1 Unk conventional K-Ar (NOT GIVEN) no decay constants given* "SANIDINE, PLAGIOCLASE, AND NONHYDRATED GLASS WERE DATED" NO ANALYTICAL DATA GIVEN AN AGE RANGE OF 0.6 TO 0.53 M.Y. WAS OBTAINED. ONE SAMPLE GAVE AN AGE OF 0.26 M.Y. 1348 1 sanidine conventional K-Ar (NOT GIVEN) no decay constants given* NO ANALYTICAL DATA GIVEN AGES RANGE FROM 0.2 TO 0.07 M.Y. 1349 1 0.18 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1350 1 0.16 glass conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1351 1 0.07 glass conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1352 1 0.4 glass conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 1353 1 0.29 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" maximum age of volcanism NO ANALYTICAL DATA GIVEN 1401 1 2310 55 biotite conventional K-Ar GM-98-68 "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 604.7 99 initial age disturbed by later metamorphism 1405 1 2680 160 hornblende conventional K-Ar FCA-R-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.895 79.18 96 minimum age of metamorphic crystallization 1407 1 1570 50 biotite conventional K-Ar GM-56 "4.962E-04, 0.581E-04, 1.1167E-04" 8.36 301.2 99 "AGE INDICATES THAT ROCK REMAINED UNDER OPEN-STATE CONDITIONS FOR MILLIONS OF YEARS, PROBABLY DUE TO HIGH THERMAL CONDITIONS DEEP IN THE CRUST" 1417 1 1780 40 biotite conventional K-Ar D1686 "4.962E-04, 0.581E-04, 1.1167E-04" 5.4 236.1 99 initial age disturbed by later metamorphism 1428 1 2460 45 actinolite 39Ar-40Ar total fusion D1784 "4.962E-04, 0.581E-04, 1.1167E-04" maximum age of intrusion NEPHRITE IS A VARIETY OF ACTINOLITE SEE ARTICLE FOR ANALYTICAL DATA 1428 2 2560 45 actinolite 39Ar-40Ar total fusion D1784 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NEPHRITE IS A VARIETY OF ACTINOLITE 1429 1 2650 130 labrodorite 39Ar-40Ar total fusion GM-106-69 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 1430 1 65.85 0.7 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.43 8.14 97 age of volcanism 1431 1 73.19 0.7 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 5.31 5.71 94 age of volcanism 1432 1 74.43 2.2 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.3 9.08 96 age of volcanism 1432 2 74.31 0.7 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.24 9 96 age of volcanism 1432 3 72.93 0.7 sanidine conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 11.46 12.28 80 age of volcanism SAMPLE GAVE AN INITIAL AGE OF 75.2 +/- 2.3 M.Y. BUT THIS AGE WAS DUE TO EXTRANEOUS GRAINS OF K-FELDSPAR 1433 1 79.95 1.6 biotite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 8.08 9.51 97 age of volcanism 1433 2 79.79 0.8 biotite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 8.08 9.49 94 age of volcanism 1434 1 79.26 0.8 biotite conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.53 9.95 95 age of volcanism 1435 1 80.05 0.8 biotite conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 9.84 96 age of volcanism 1436 1 84.44 0.8 biotite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 7.77 9.67 97 age of volcanism 1437 1 79.82 0.8 biotite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 5.43 6.38 92 age of volcanism AGE MAY BE LOW 1438 1 89.1 1.7 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 6.73 8.85 92 age of volcanism 1438 2 88.81 0.9 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 6.73 8.82 93 age of volcanism 1439 1 91.09 0.9 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 4.55 6.12 92 age of volcanism 1440 1 97.46 1 biotite conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.19E-04*" 7.47 10.77 96 age of volcanism 1440 2 97.49 1 sanidine conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.19E-04*" 11.42 16.47 97 age of volcanism 1441 1 124.08 10 hornblende conventional K-Ar K-1H "4.72E-04, 0.584E-04, 1.19E-04*" 3.45 6.38 43 "sample contains inherited material, age is too old" "SUBSEQUENT K-AR DATING INDICATES THAT THE DIKE IS EOCENE IN AGE (SEE MARVIN, WITKIND, KEEFER, AND MEHNERT, 1973)" 1442 1 1465.32 30 hornblende conventional K-Ar K-2H "4.72E-04, 0.584E-04, 1.19E-04*" 1.18 38.4 87 initial age disturbed by later metamorphism 1443 1 1426.3 30 hornblende conventional K-Ar K-3H "4.72E-04, 0.584E-04, 1.19E-04*" 1.24 38.8 84 initial age disturbed by later metamorphism 1444 1 1385.19 30 biotite conventional K-Ar K-4B "4.72E-04, 0.584E-04, 1.19E-04*" 3.6 108 87 initial age disturbed by later metamorphism 1444 2 1480.54 30 hornblende conventional K-Ar K-4H "4.72E-04, 0.584E-04, 1.19E-04*" 1.58 52.2 95 initial age disturbed by later metamorphism 1445 1 1720.68 35 biotite conventional K-Ar K-5B "4.72E-04, 0.584E-04, 1.19E-04*" 5.14 213 99 initial age disturbed by later metamorphism 1445 2 1816.48 35 hornblende conventional K-Ar K-5H "4.72E-04, 0.584E-04, 1.19E-04*" 1.72 77.6 97 age of metamorphic crystallization 1446 1 1695.88 35 biotite conventional K-Ar K-10B "4.72E-04, 0.584E-04, 1.19E-04*" 3.85 156 98 initial age disturbed by later metamorphism 1446 2 1776.4 35 hornblende conventional K-Ar K-10H "4.72E-04, 0.584E-04, 1.19E-04*" 1.66 72.3 95 minimum age of metamorphic crystallization 1447 1 1738.32 35 hornblende conventional K-Ar 10H "4.72E-04, 0.584E-04, 1.19E-04*" 1.76 74.1 88 initial age disturbed by later metamorphism 1448 1 1610.65 30 hornblende conventional K-Ar 11H "4.72E-04, 0.584E-04, 1.19E-04*" 2.55 95.5 84 initial age disturbed by later metamorphism 1449 1 1501.25 30 biotite conventional K-Ar 14B "4.72E-04, 0.584E-04, 1.19E-04*" 6.91 233 99 initial age disturbed by later metamorphism 1450 1 1560.85 35 hornblende conventional K-Ar 15H "4.72E-04, 0.584E-04, 1.19E-04*" 1.45 51.8 98 initial age disturbed by later metamorphism 1451 1 1618.54 30 hornblende conventional K-Ar 34H "4.72E-04, 0.584E-04, 1.19E-04*" 2.73 103 97 initial age disturbed by later metamorphism 1452 1 33.2 3 muscovite conventional K-Ar 100 MU "4.72E-04, 0.584E-04, 1.19E-04*" 10.26 4.95 76 initial age disturbed by later metamorphism 1491 1 2631.87 135 hornblende conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.18E-04*" 0.645 55.3 96 age of intrusion K2O AND 40AR CONVERTED BY COMPILER 1492 1 1535.14 77 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.18E-04*" 8.41 293.1 93 initial age disturbed by later metamorphism K2O AND 40AR CONVERTED BY COMPILER "AGE LOWERED BY DULUTH GABBRO, 2.7 KM AWAY" 1492 2 2483.04 125 hornblende conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.18E-04*" 1.19 91.5 97 age of intrusion K2O AND 40AR CONVERTED BY COMPILER 1493 1 2715.24 140 hornblende conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.18E-04*" 0.49 44.6 93 age of intrusion K2O AND 40AR CONVERTED BY COMPILER 1494 1 2557.57 130 hornblende conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.18E-04*" 1.22 99.1 98 age meaning uncertain (geologic factors) K2O AND 40AR CONVERTED BY COMPILER POSSIBLE THERMAL DISTURBANCE 1700-1800 M.Y. AGO 1495 1 1792.22 90 hornblende conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.18E-04*" 1.08 47.7 84 Goldich and others (1961) K2O AND 40AR CONVERTED BY COMPILER 1496 1 1280.79 70 whole rock conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.18E-04*" 0.931 25 85 minimum age of intrusion K2O AND 40AR CONVERTED BY COMPILER AGE MAY BE LOW DUE TO AR-DIFFUSION 1497 1 1457.87 75 whole rock conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.18E-04*" 2.39 77.2 98 minimum age of intrusion K2O AND 40AR CONVERTED BY COMPILER AGE MAY BE LOW DUE TO AR-DIFFUSION 1498 1 1567.87 80 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.18E-04*" 0.684 24.6 91 minimum age of intrusion K2O AND 40AR CONVERTED BY COMPILER AGE MAY BE LOW DUE TO AR-DIFFUSION 1499 1 2113.67 110 whole rock conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.18E-04*" 0.548 31.7 94 age of intrusion K2O AND 40AR CONVERTED BY COMPILER 1499 2 2032.91 50 whole rock conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.18E-04*" 0.79 42.8 99 age of intrusion K2O AND 40AR CONVERTED BY COMPILER 1500 1 1738.69 90 hornblende conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.18E-04*" 0.964 40.6 96 age of intrusion K2O AND 40AR CONVERTED BY COMPILER 1559 1 1132.09 microcline conventional K-Ar MICROCLINE 3 "4.72E-04, 0.585E-04, 1.19E-04*" 11.82 268 93 Wasserburg and others (1956) age not evaluated AGE TOO YOUNG 1560 1 41.7 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.04 5.49 18 minimum age of intrusion 1560 2 41.02 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.04 5.4 72 minimum age of intrusion 1561 1 1330.03 K feldspar conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 252 88 minimum age of intrusion 1561 2 1344.9 K feldspar conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 256 79 minimum age of intrusion 1562 1 1630.36 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.07 346 98 minimum age of metamorphic crystallization 1563 1 1773.84 K feldspar conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.55 415 98 minimum age of metamorphic crystallization 1564 1 2439.97 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.56 41.7 94 minimum age of metamorphic crystallization 1566 1 1690 muscovite conventional K-Ar 1 no decay constants given* 10.1 406 minimum age of intrusion 1566 2 1223.92 microcline conventional K-Ar 2 no decay constants given* 9.598 242 AGE TOO YOUNG; MICROCLINE HAS LEAKED ARGON 1566 3 1165 microcline conventional K-Ar 3 no decay constants given 11.65 275 AGE TOO YOUNG; MICROCLINE HAS LEAKED ARGON 1567 1 1157.88 whole rock conventional K-Ar 4 no decay constants given* 4.92 115 AGE TOO YOUNG; K-FELDSPAR LEAKED ARGON 1568 1 259 muscovite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.17 40.8 age of intrusion AGE RE-CALCULATED WITH NEW DECAY CONSTANTS-COMPILER 1568 2 212 microcline conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 12.66 41 AGE TOO YOUNG; MICROCLINE LEAKED ARGON 1569 1 260 muscovite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 10.14 40.8 age of intrusion AGE RE-CALCULATED WITH NEW DECAY CONSTANTS-COMPILER 1570 1 255 muscovite conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 10.19 40.2 age of intrusion AGE RE-CALCULATED WITH NEW DECAY CONSTANTS--COMPILER 1570 2 213 microcline conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 13.61 44.4 AGE RE-CALCULATED WITH NEW DECAY CONSTANTS--COMPILER AGE TOO YOUNG; MICROCLINE LEAKED ARGON 1572 1 375 muscovite conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 10.14 60.8 age of intrusion AGE RE-CALCULATED WITH NEW DECAY CONSTANTS--COMPILER 1572 2 277 microcline conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 11.79 50.9 AGE RE-CALCULATED WITH NEW DECAY CONSTANTS--COMPILER AGE TOO YOUNG; MICROCLINE LEAKED ARGON 1573 1 283 microcline conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 13.4 59.1 AGE RE-CALCULATED WITH NEW DECAY CONSTANTS--COMPILER AGE TOO YOUNG; MICROCLINE LEAKED ARGON 1574 1 449.64 glauconite conventional K-Ar 1 no decay constants given* 6.23 45.8 age not evaluated 1575 1 386.1 K feldspar conventional K-Ar 2 no decay constants given* 13.31 82.5 age not evaluated AUTHIGENIC FELDSPAR 1576 1 70.52 glauconite conventional K-Ar 3 no decay constants given* 6.51 6.74 age not evaluated 1577 1 51.15 glauconite conventional K-Ar 4 no decay constants given* 7.23 5.4 age not evaluated 1636 1 256.16 13 biotite conventional K-Ar N-A1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 31.78 97 age of later metamorphism 1638 1 258.15 13 biotite conventional K-Ar 1737 "4.72E-04, 0.585E-04, 1.19E-04*" 9.08 36.28 95 age of intrusion 1640 1 353.5 17 hornblende conventional K-Ar 688 "4.72E-04, 0.585E-04, 1.19E-04*" 0.45 2.53 89 age meaning uncertain (geologic factors) 1641 1 246.9 12 biotite conventional K-Ar 1325 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 30.78 97 age of later metamorphism 1642 1 288.26 14 hornblende conventional K-Ar 2073 "4.72E-04, 0.585E-04, 1.19E-04*" 0.24 1.08 77 age meaning uncertain (geologic factors) 1643 1 240.56 12 biotite conventional K-Ar 1958 "4.72E-04, 0.585E-04, 1.19E-04*" 9.59 35.53 95 age of later metamorphism 1644 1 250.16 12 muscovite conventional K-Ar 1337 "4.72E-04, 0.585E-04, 1.19E-04*" 6.8 26.27 93 age of later metamorphism 1644 2 222.62 12 biotite conventional K-Ar 1337 "4.72E-04, 0.585E-04, 1.19E-04*" 7.71 26.3 96 age of later metamorphism 1645 1 248.95 12 muscovite conventional K-Ar 1902 "4.72E-04, 0.585E-04, 1.19E-04*" 9.44 36.28 93 age of later metamorphism 1645 2 233.76 11 biotite conventional K-Ar 1902 "4.72E-04, 0.585E-04, 1.19E-04*" 5.26 18.9 92 age of later metamorphism 1651 1 250.2 12 muscovite conventional K-Ar 1709 "4.72E-04, 0.585E-04, 1.19E-04*" 10.36 40.03 94 age of later metamorphism 1656 1 246.21 12 muscovite conventional K-Ar 2075 "4.72E-04, 0.585E-04, 1.19E-04*" 10.54 40.03 93 age of later metamorphism 1657 1 1118.42 biotite conventional K-Ar 1 (LS-108) "4.72E-04, 0.585E-04, 1.19E-04*" 5.29 118 96 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1800 M.Y. 1657 2 982.36 K feldspar conventional K-Ar 1 (LS-108) "4.72E-04, 0.585E-04, 1.19E-04*" 16.57 311.5 99 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1800 M.Y. 1657 3 1292.45 muscovite conventional K-Ar 1 (LS-108) "4.72E-04, 0.585E-04, 1.19E-04*" 7.06 192 83 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1800 M.Y. 1658 1 1343.23 biotite conventional K-Ar 2 (LS-47) "4.72E-04, 0.585E-04, 1.19E-04*" 7.85 225.4 96 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1950 M.Y. 1658 2 1252.35 muscovite conventional K-Ar 2 (LS-47) "4.72E-04, 0.585E-04, 1.19E-04*" 6.72 174.9 93 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1950 M.Y. 1658 3 1159.24 K feldspar conventional K-Ar 2 (LS-47) "4.72E-04, 0.585E-04, 1.19E-04*" 16.3 381.6 99 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1950 M.Y. 1659 1 1808.83 hornblende conventional K-Ar 3 (RB-9-54) "4.72E-04, 0.585E-04, 1.19E-04*" 0.569 25.5 98 age of metamorphic crystallization 1660 1 1549.2 hornblende conventional K-Ar 4 (RB-120-52) "4.72E-04, 0.585E-04, 1.19E-04*" 0.107 3.78 83 minimum age of metamorphic crystallization 1661 1 1262.19 biotite conventional K-Ar 5 (LS-48) "4.72E-04, 0.585E-04, 1.19E-04*" 1.144 30.1 50 initial age disturbed by later metamorphism CONSIDERABLE ALTERATION TO CHLORITE AND MUSCOVITE CRYSTALLIZATION IS PROBABLY AROUND 1800 M.Y. 1662 1 1170.09 biotite conventional K-Ar 6 (LS-49) "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 202 97 initial age disturbed by later metamorphism CONTAINS INCLUSIONS OF SPHENE AND ZIRCON CRYSTALLIZATION AGE IS PROBABLY AROUND 1800 M.Y. 1663 1 1230 biotite conventional K-Ar 7 (LS-128) "4.72E-04, 0.585E-04, 1.19E-04*" 7.17 182 94 initial age disturbed by later metamorphism AGE IS AROUND 1800 M.Y. 1663 2 1520 muscovite conventional K-Ar 7 (LS-128) "4.72E-04, 0.585E-04, 1.19E-04*" 10.66 366.5 97 initial age disturbed by later metamorphism AGE IS AROUND 1800 M.Y. 1663 3 1180 K feldspar conventional K-Ar 7 (LS-128) "4.72E-04, 0.585E-04, 1.19E-04*" 11.59 276.8 98 "age meaning uncertain (geologic factors), initial age disturbed by later metamorphism" AGE IS AROUND 1800 M.Y. 1664 1 1250 biotite conventional K-Ar 8A (LS-42A) "4.72E-04, 0.585E-04, 1.19E-04*" 4.73 122.9 95 initial age disturbed by later metamorphism K20 SEEMS LOW-COMPILER CRYSTALLIZATION AGE IS AROUND 1900 M.Y. 1664 2 1360 muscovite conventional K-Ar 8A (LS-42A) "4.72E-04, 0.585E-04, 1.19E-04*" 10.02 293.5 78 initial age disturbed by later metamorphism CRYSTALLIZATION AGE IS AROUND 1900 M.Y. 1665 1 1630 muscovite conventional K-Ar 8B (LS-42B) "4.72E-04, 0.585E-04, 1.19E-04*" 10.34 394.6 98 initial age disturbed by later metamorphism AGE CALCULATED BY COMPILER INITIAL AGE IS ABOUT 2700 M.Y. 1665 2 1240 biotite conventional K-Ar 8B (LS-42B) "4.72E-04, 0.585E-04, 1.19E-04*" 8.06 207 95 initial age disturbed by later metamorphism INITIAL AGE IS ABOUT 2700 M.Y. 1665 3 1690 hornblende conventional K-Ar 8B (LS-42B) "4.72E-04, 0.585E-04, 1.19E-04*" 0.879 35.45 96 initial age disturbed by later metamorphism INITIAL AGE IS ABOUT 2700 M.Y. 1666 1 1578.48 biotite conventional K-Ar 9 (LS-112) "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 316.8 98 age not evaluated 1667 1 1587.56 biotite conventional K-Ar 10 (LS-44A) "4.72E-04, 0.585E-04, 1.19E-04*" 4.53 166 95 age not evaluated CONSIDERABLE CHLORITE PRESENT 1667 2 1134.29 K feldspar conventional K-Ar 10 (LS-44A) "4.72E-04, 0.585E-04, 1.19E-04*" 11.38 258.7 60 age not evaluated 1668 1 1250 biotite conventional K-Ar 11 (LS-40C) "4.72E-04, 0.585E-04, 1.19E-04*" 8.62 223 88 initial age disturbed by later metamorphism 1668 2 1150 muscovite conventional K-Ar 11 (LS-40C) "4.72E-04, 0.585E-04, 1.19E-04*" 7.01 163 97 initial age disturbed by later metamorphism 1669 1 2060 hornblende conventional K-Ar 12 (HJ-20A-52) "4.72E-04, 0.585E-04, 1.19E-04*" 0.364 20.1 97 age not evaluated 1670 1 1109.8 biotite conventional K-Ar 13 (LS-40H) "4.72E-04, 0.585E-04, 1.19E-04*" 6.84 151 96 initial age disturbed by later metamorphism 1671 1 1592.81 hornblende conventional K-Ar 14 (HJ-68-55) "4.72E-04, 0.585E-04, 1.19E-04*" 0.208 7.66 77 initial age disturbed by later metamorphism 1672 1 1574.55 hornblende conventional K-Ar 15 (HJ-63-55) "4.72E-04, 0.585E-04, 1.19E-04*" 0.699 25.3 91 initial age disturbed by later metamorphism 1673 1 1375.14 biotite conventional K-Ar 16 (LS-129B) "4.72E-04, 0.585E-04, 1.19E-04*" 9.33 277 98 initial age disturbed by later metamorphism 1674 1 1348 biotite conventional K-Ar 17 (LS-129A) "4.72E-04, 0.585E-04, 1.19E-04*" 6.48 187 94 initial age disturbed by later metamorphism 1674 2 1488.37 muscovite conventional K-Ar 17(LS-129A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.62 287 97 initial age disturbed by later metamorphism 1675 1 1291.64 biotite conventional K-Ar 18 (LS-40A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 244 96 initial age disturbed by later metamorphism 1676 1 1247.84 biotite conventional K-Ar 19 (LS-129C) "4.72E-04, 0.585E-04, 1.19E-04*" 8.92 231 91 initial age disturbed by later metamorphism 1677 1 1448.25 whole rock conventional K-Ar 20 (LS-40F) "4.72E-04, 0.585E-04, 1.19E-04*" 2.26 72.3 96 initial age disturbed by later metamorphism 1678 1 1444.98 biotite conventional K-Ar 21 (LS-110) "4.72E-04, 0.585E-04, 1.19E-04*" 6.68 213 94 initial age disturbed by later metamorphism 1678 2 1463.4 muscovite conventional K-Ar 21 (LS-110) "4.72E-04, 0.585E-04, 1.19E-04*" 6.25 203 90 initial age disturbed by later metamorphism 1679 1 1157.24 muscovite conventional K-Ar 22 (LS-111) "4.72E-04, 0.585E-04, 1.19E-04*" 10.19 238 97 initial age disturbed by later metamorphism 1680 1 1436.53 biotite conventional K-Ar 23 (LS-43A) "4.72E-04, 0.585E-04, 1.19E-04*" 4.27 135 95 initial age disturbed by later metamorphism K20 SEEMS LOW--COMPILER INITIAL AGE IS ABOUT 2700 M.Y. 1680 2 1736.42 hornblende conventional K-Ar 23 (LS-43A) "4.72E-04, 0.585E-04, 1.19E-04*" 0.916 38.5 97 initial age disturbed by later metamorphism INITIAL AGE IS ABOUT 2700 M.Y. 1681 1 1374.62 biotite conventional K-Ar 24 (LS-115) "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 263.2 98 initial age disturbed by later metamorphism INITIAL AGE IS ABOUT 2700 M.Y. 1681 2 1184.19 K feldspar conventional K-Ar 24 (LS-115) "4.72E-04, 0.585E-04, 1.19E-04*" 10.54 254 99 initial age disturbed by later metamorphism INITAL AGE IS ABOUT 2700 M.Y. 1682 1 1171.72 biotite conventional K-Ar 25A (LA-114A) "4.72E-04, 0.585E-04, 1.19E-04*" 9.43 224 97 initial age disturbed by later metamorphism INITIAL AGE IS ABOUT 2700 M.Y. 1682 2 1167.49 K feldspar conventional K-Ar 25A (LS-114A) "4.72E-04, 0.585E-04, 1.19E-04*" 15.78 373 99 initial age disturbed by later metamorphism INITIAL AGE IS ABOUT 2700 M.Y. 1684 1 1376.27 biotite conventional K-Ar 29 (LS-126) "4.72E-04, 0.585E-04, 1.19E-04*" 4.71 140 97 initial age disturbed by later metamorphism (K20 SEEMS LOW--COMPILER) INITIAL AGE IS AROUND 2700 M.Y. 1684 2 1154.54 K feldspar conventional K-Ar 29 (LS-126) "4.72E-04, 0.585E-04, 1.19E-04*" 14.41 335.5 99 initial age disturbed by later metamorphism INITIAL AGE IS AROUND 2700 M.Y. 1685 1 927.23 K feldspar conventional K-Ar 30 (LS-109) "4.72E-04, 0.585E-04, 1.19E-04*" 7.22 126 97 K-FELDSPAR PROBABLY LEAKED ARGON; INITIAL AGE IS PROBABLY AROUND 2700 M.Y. 1686 1 1763.97 muscovite conventional K-Ar 31 (LS-25C) "4.72E-04, 0.585E-04, 1.19E-04*" 10.4 448 99 minimum age of intrusion 1687 1 978.64 whole rock conventional K-Ar 32 (HJ-144-51) "4.72E-04, 0.585E-04, 1.19E-04*" 1.16 21.7 90 minimum age of intrusion 1689 1 438.31 13 riebeckite conventional K-Ar 95 "4.72E-04, 0.585E-04, 1.19E-04*" 0.931 6.65 96 Zartman (1977) minimum age of intrusion 1690 1 466.06 14 riebeckite conventional K-Ar 96 "4.72E-04, 0.585E-04, 1.19E-04*" 0.768 5.88 95 Zartman (1977) age of intrusion 1691 1 451.57 13 riebeckite conventional K-Ar 97 "4.72E-04, 0.585E-04, 1.19E-04*" 0.953 7.04 93 Zartman (1977) age of intrusion 1692 1 445.29 13 riebeckite conventional K-Ar 98 "4.72E-04, 0.585E-04, 1.19E-04*" 0.612 4.45 92 Zartman (1977) age of intrusion 1694 1 445.01 13 riebeckite conventional K-Ar 211 "4.72E-04, 0.585E-04, 1.19E-04*" 0.962 6.99 91 Zartman (1977) minimum age of intrusion 1694 2 936.56 28 pyroxenes conventional K-Ar 211 "4.72E-04, 0.585E-04, 1.19E-04*" 0.198 3.5 75 Zartman (1977) "sample contains excess radiogenic argon, age is too old" 1697 1 307.66 9 riebeckite conventional K-Ar 213 "4.72E-04, 0.585E-04, 1.19E-04*" 1.876 9.06 92 Zartman (1977) initial age disturbed by later metamorphism 1699 1 387.34 11 hornblende conventional K-Ar 164 "4.72E-04, 0.585E-04, 1.19E-04*" 1.778 11.06 97 Zartman (1977) minimum age of intrusion 1702 1 359.06 11 biotite conventional K-Ar 165D "4.72E-04, 0.585E-04, 1.19E-04*" 6.78 38.78 92 Zartman (1977) age meaning uncertain (geologic factors) 1703 1 400.33 12 riebeckite conventional K-Ar 166 "4.72E-04, 0.585E-04, 1.19E-04*" 1.108 7.15 97 Zartman (1977) age meaning uncertain (geologic factors) 1705 1 404.98 12 hornblende conventional K-Ar 168 "4.72E-04, 0.585E-04, 1.19E-04*" 1.282 8.38 98 Zartman (1977) age meaning uncertain (geologic factors) 1707 1 381.45 11 hornblende conventional K-Ar 170 "4.72E-04, 0.585E-04, 1.19E-04*" 1.125 6.88 97 Zartman (1977) age of intrusion 1708 1 397.11 12 hornblende conventional K-Ar 260 "4.72E-04, 0.584E-04, 1.19E-04*" 1.24 7.93 97 Zartman (1977) minimum age of intrusion 1710 1 376.77 11 hornblende conventional K-Ar 60B "4.72E-04, 0.585E-04, 1.19E-04*" 0.925 5.58 94 Zartman (1977) age of intrusion 1711 1 410.88 12 hornblende conventional K-Ar 90 "4.72E-04, 0.585E-04, 1.19E-04*" 0.712 4.73 95 Zartman (1977) maximum age of intrusion 1712 1 392.02 12 hornblende conventional K-Ar 91 "4.72E-04, 0.585E-04, 1.19E-04*" 0.671 4.23 95 Zartman (1977) age of intrusion 1713 1 376.22 11 hornblende conventional K-Ar 92 "4.72E-04, 0.585E-04, 1.19E-04*" 0.885 5.33 94 Zartman (1977) age of intrusion 1714 1 357.98 10 hornblende conventional K-Ar 171 "4.72E-04, 0.585E-04, 1.19E-04*" 1.37 7.81 96 Zartman (1977) age of intrusion 1714 2 374.1 11 biotite conventional K-Ar 171 "4.72E-04, 0.585E-04, 1.19E-04*" 7.98 47.76 98 Zartman (1977) age of intrusion 1715 1 498.44 15 biotite conventional K-Ar 88-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.35 60.75 95 Zartman (1977) age of intrusion 1716 1 421.67 12 biotite conventional K-Ar 160 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 56.49 98 Zartman (1977) minimum age of intrusion 1717 1 417.4 12 biotite conventional K-Ar 161-A "4.72E-04, 0.585E-04, 1.19E-04*" 8.67 58.62 96 Zartman (1977) age of intrusion 1724 1 1237.52 biotite conventional K-Ar 26 (LS-54) "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 213 96 initial age disturbed by later metamorphism 1724 2 1359.73 muscovite conventional K-Ar 26 (LS-54) "4.72E-04, 0.585E-04, 1.19E-04*" 9.18 268.2 98 initial age disturbed by later metamorphism 1724 3 1087.5 K feldspar conventional K-Ar 26 (LS-54) "4.72E-04, 0.585E-04, 1.19E-04*" 4.98 107 95 initial age disturbed by later metamorphism 1725 1 1383.65 biotite conventional K-Ar 27 (LS-53) "4.72E-04, 0.585E-04, 1.19E-04*" 6.31 189 95 initial age disturbed by later metamorphism 1725 2 1589.67 hornblende conventional K-Ar 27 (LS-53) "4.72E-04, 0.585E-04, 1.19E-04*" 1.17 42.96 98 initial age disturbed by later metamorphism 1726 1 1357.22 biotite conventional K-Ar 28 (LS-125) "4.72E-04, 0.585E-04, 1.19E-04*" 4.53 132 89 initial age disturbed by later metamorphism 1726 2 1371.31 hornblende conventional K-Ar 28 (LS-125) "4.72E-04, 0.585E-04, 1.19E-04*" 0.443 13.1 94 initial age disturbed by later metamorphism 1727 1 1062.61 34 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.42 154.6 age of intrusion 1728 1 1048 11 plagioclase 39Ar-40Ar incremental (plateau) DEL-93 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism PLATEAU AGE INITIAL AGE IS THOUGHT TO BE AROUND 1130 M.Y. 1728 2 1127 34 plagioclase conventional K-Ar DEL-93 "4.72E-04, 0.585E-04, 1.19E-04" THIS AGE IS NOT IN AGREEMENT WITH 40AR/39AR AGES 1728 3 1015.88 31 plagioclase conventional K-Ar DEL-93 "4.72E-04, 0.585E-04, 1.19E-04*" 0.332 6.52 initial age disturbed by later metamorphism AUTHORS BELIEVE LOW-GRADE METAMORPHIC EVENT IS RESPONSIBLE FOR LOWER AGE 1728 4 1057 12 plagioclase 40Ar/36Ar-40K/36Ar isochron DEL-93 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism ISOCHRON AGE OF PLATEAU POINTS 1728 5 1024 20 plagioclase 39Ar-40Ar total fusion DEL-93 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism TOTAL FUSION 1729 1 1896 biotite conventional K-Ar KA-66 "4.76E-04, 0.589E-04, 1.18E-04*" 6.31 305 initial age disturbed by later metamorphism 1730 1 1610 whole rock conventional K-Ar KA-278 "4.76E-04, 0.589E-04, 1.18E-04*" 6.68 250 initial age disturbed by later metamorphism 1731 1 1628 muscovite conventional K-Ar KA-68 "4.76E-04, 0.589E-04, 1.18E-04*" 10.19 388 initial age disturbed by later metamorphism 1732 1 1165 K feldspar OSA "4.76E-04, 0.589E-04, 1.18E-04*" 11.8 278 NO AGE REPORTED 1733 1 1358 whole rock conventional K-Ar KA-238 "4.76E-04, 0.589E-04, 1.18E-04*" 7.13 208 initial age disturbed by later metamorphism 1734 1 1732 biotite conventional K-Ar KA-45 "4.76E-04, 0.589E-04, 1.18E-04*" 7.88 330 initial age disturbed by later metamorphism ARGON VALUE IS AVERAGE OF 3 DETERMINATIONS. 1735 1 1669 muscovite conventional K-Ar KA-184 "4.76E-04, 0.589E-04, 1.18E-04*" 9.23 365 age of intrusion 1736 1 1437 biotite conventional K-Ar KA-12 "4.76E-04, 0.589E-04, 1.18E-04*" 6.45 204 age not evaluated 1736 2 932.26 K feldspar KA-12 12.69 223 NO AGE GIVEN 1737 1 1491 biotite conventional K-Ar KA-330 "4.76E-04, 0.589E-04, 1.18E-04*" 9.38 313 age not evaluated 1738 1 400.3 19 muscovite conventional K-Ar 1 (CONNECTICUT) "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 53.04 97 age not evaluated 1739 1 321.57 16 biotite conventional K-Ar 2 (CONNECTICUT) "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 43.28 94 initial age disturbed by later metamorphism 1740 1 321.92 16 biotite conventional K-Ar 3 (CONNECTICUT) "4.72E-04, 0.585E-04, 1.19E-04*" 7.84 39.78 95 initial age disturbed by later metamorphism 1741 1 250.44 7 muscovite conventional K-Ar 4 (CONNECTICUT) "4.72E-04, 0.585E-04, 1.19E-04*" 10.22 39.53 74 age of intrusion 1742 1 237.66 7 biotite conventional K-Ar 5 (CONNECTICUT) "4.72E-04, 0.585E-04, 1.19E-04*" 9.1 33.28 93 age of later metamorphism 1743 1 239.56 7 biotite conventional K-Ar 6 (CONNECTICUT) "4.72E-04, 0.585E-04, 1.19E-04*" 8.41 31.02 96 age of later metamorphism 1744 1 244.37 7 biotite conventional K-Ar 1 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 8.435 31.78 94 age of later metamorphism 1745 1 234 10 biotite conventional K-Ar 2 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 6.33 22.77 95 age of later metamorphism 1745 2 253.14 10 muscovite conventional K-Ar 2 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 9.72 38.03 96 age of later metamorphism 1746 1 233.42 10 biotite conventional K-Ar 3 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 7.88 28.27 94 age of later metamorphism 1747 1 204.04 10 biotite conventional K-Ar 4 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 9.17 28.52 77 age of later metamorphism 1748 1 218.98 10 biotite conventional K-Ar 5 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 8.21 27.52 94 age of later metamorphism 1749 1 202.32 12 biotite conventional K-Ar 6 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 9.82 30.27 96 age of later metamorphism 1750 1 202.87 10 biotite conventional K-Ar 7 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 26.77 89 age of later metamorphism 1751 1 236.51 8 biotite conventional K-Ar 8 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 7.77 28.27 96 age of later metamorphism 1752 1 232.64 8 biotite conventional K-Ar 9 (RHODE ISLAND) "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 31.53 97 age of later metamorphism 1753 1 363.23 11 biotite conventional K-Ar 1 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.12 47.04 98 initial age disturbed by later metamorphism 1753 2 380.11 12 hornblende conventional K-Ar 1 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.265 7.706 88 minimum age of intrusion 1754 1 315.74 9 biotite conventional K-Ar 2 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 41.53 81 initial age disturbed by later metamorphism 1755 1 311.44 15 hornblende conventional K-Ar 3 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 0.68 3.328 78 initial age disturbed by later metamorphism 1756 1 352.18 10 muscovite conventional K-Ar 4 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 48.04 83 initial age disturbed by later metamorphism 1756 1 352.18 10 muscovite conventional K-Ar 4 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 48.04 83 initial age disturbed by later metamorphism 1757 1 345.25 12 biotite conventional K-Ar 5 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 5.71 31.28 66 initial age disturbed by later metamorphism 1758 1 318.2 9 hornblende conventional K-Ar 6 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 0.403 2.019 41 initial age disturbed by later metamorphism 1759 1 507.88 15 biotite conventional K-Ar 7 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.117 9.433 56 minimum age of metamorphic crystallization 1760 1 327.65 9 whole rock conventional K-Ar 8 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 4.025 20.82 85 initial age disturbed by later metamorphism 1761 1 268.73 8 biotite conventional K-Ar 9 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 6.46 26.95 92 age of later metamorphism 1762 1 257.76 8 biotite conventional K-Ar 10 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 9.22 36.78 91 age of later metamorphism 1762 2 238.49 8 muscovite conventional K-Ar 10 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 10.36 38.03 84 initial age disturbed by later metamorphism 1763 1 248.69 13 biotite conventional K-Ar 11 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 34.78 92 age of later metamorphism 1764 1 245.74 8 muscovite conventional K-Ar 12 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 9.34 35.4 92 age of later metamorphism 1765 1 323.05 9 biotite conventional K-Ar 13 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.99 45.79 95 initial age disturbed by later metamorphism 1766 1 335.37 17 muscovite 14 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 10.09 53.54 92 initial age disturbed by later metamorphism 1767 1 284.75 10 muscovite conventional K-Ar 15 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 10.48 46.54 94 initial age disturbed by later metamorphism 1768 1 337.63 18 hornblende conventional K-Ar 16 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 0.66 3.528 66 initial age disturbed by later metamorphism 1769 1 340 9 biotite conventional K-Ar 17 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 7.06 38.03 93 initial age disturbed by later metamorphism 1770 1 296.91 15 whole rock conventional K-Ar 18 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.89 8.782 74 minimum age of intrusion 1771 1 307.99 15 whole rock conventional K-Ar 19 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 0.177 0.8558 22 minimum age of intrusion 1772 1 312.36 9 muscovite conventional K-Ar 20 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 10.65 52.29 94 initial age disturbed by later metamorphism 1773 1 313.9 15 hornblende conventional K-Ar 21 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 0.251 1.239 41 initial age disturbed by later metamorphism 1774 1 260.14 8 whole rock conventional K-Ar 22 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.36 5.479 88 minimum age of intrusion 1775 1 265.55 8 biotite conventional K-Ar 23 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 4.477 18.44 88 initial age disturbed by later metamorphism 1775 2 367 10 hornblende conventional K-Ar 23 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.217 7.131 81 minimum age of intrusion 1776 1 403.29 12 biotite conventional K-Ar 24 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 7.98 51.92 92 minimum age of intrusion 1777 1 416.52 12 whole rock conventional K-Ar 25 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.65 11.13 82 minimum age of intrusion 1778 1 363.46 8 biotite conventional K-Ar 26 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 7.64 44.29 84 age of later metamorphism 1779 1 358.82 8 hornblende conventional K-Ar 27 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 0.963 5.504 40 minimum age of intrusion 1780 1 363.4 10 hornblende conventional K-Ar 28 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.118 6.48 59 minimum age of intrusion 1781 1 361.3 10 hornblende conventional K-Ar 29 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.59 9.157 46 minimum age of intrusion 1782 1 417.77 16 hornblende conventional K-Ar 30 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.22 8.257 84 minimum age of intrusion 1783 1 365.29 10 biotite conventional K-Ar 31 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 7.555 44.04 90 minimum age of intrusion 1784 1 342.36 15 whole rock conventional K-Ar 32 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.3 7.056 62 minimum age of intrusion 1785 1 425.71 16 whole rock conventional K-Ar 33 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 1.6 11.06 86 "sample contains inherited material, age is too old" 1785 2 359.88 10 muscovite conventional K-Ar 33 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 46.79 90 60-80 MESH FRACTION MIXED AGE OF DETRITAL MUSCOVITE 1785 3 298.99 8 muscovite conventional K-Ar 33 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 39.28 90 80-120 MESH FRACTION AGE OF DETRITAL MUSCOVITE IS IN FAIR AGREEMENT WITH STRATIGRAPHIC AGE 1786 1 300.42 10 whole rock conventional K-Ar 34 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 2.1 9.883 97 PERMIAN AGE IS PROBABLY FORTUITOUS 1786 2 348.4 9 muscovite conventional K-Ar 34 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 9.315 51.54 96 "sample contains inherited material, age is too old" 35-45 MESH 1786 3 330.09 10 muscovite conventional K-Ar 34 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 7.82 40.78 98 "sample contains inherited material, age is too old" 45-60 MESH 1786 4 388.23 8 muscovite conventional K-Ar 34 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 6.98 43.53 94 "sample contains inherited material, age is too old" LESS THAN 60 MESH 1787 1 380.38 19 biotite conventional K-Ar 35 (MASSACHUSETTS) "4.72E-04, 0.585E-04, 1.19E-04*" 8.495 51.79 96 minimum age of intrusion 1788 1 336.1 10 muscovite conventional K-Ar 1 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 10.16 54.04 75 initial age disturbed by later metamorphism 1789 1 225.32 6 biotite conventional K-Ar 2 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 7.47 25.81 84 age of later metamorphism 1789 2 237.39 10 muscovite conventional K-Ar 2 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 10.31 37.66 79 age of later metamorphism 1790 1 329.5 10 biotite conventional K-Ar 3 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 5.96 31.02 90 initial age disturbed by later metamorphism 1791 1 274.69 8 muscovite conventional K-Ar 4 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 10.31 44.04 85 initial age disturbed by later metamorphism 1792 1 271.28 8 muscovite conventional K-Ar 5 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 10.39 43.79 90 initial age disturbed by later metamorphism 1793 1 345.51 15 muscovite conventional K-Ar 6 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 9.72 53.29 83 initial age disturbed by later metamorphism 1794 1 337.05 10 muscovite conventional K-Ar 7 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 9.66 51.54 87 initial age disturbed by later metamorphism 1795 1 301.07 9 muscovite conventional K-Ar 8 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 9.76 46.04 89 initial age disturbed by later metamorphism 1796 1 336.85 10 biotite conventional K-Ar 9 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 4.5 23.994 90 initial age disturbed by later metamorphism 1797 1 257.78 7 biotite conventional K-Ar 10 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 6.71 26.77 95 age of later metamorphism 1798 1 328.83 10 biotite conventional K-Ar 11 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 6.89 35.78 94 initial age disturbed by later metamorphism 1798 2 281.66 8 muscovite conventional K-Ar 11 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 7.64 33.53 92 initial age disturbed by later metamorphism 1799 1 259.65 7 biotite conventional K-Ar 12 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 7.78 31.28 79 age of later metamorphism 1800 1 330.3 10 biotite conventional K-Ar 13 (NEW HAMPSHIRE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.15 42.53 95 initial age disturbed by later metamorphism 1801 1 254.89 8 biotite conventional K-Ar 1 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 31.02 81 age of later metamorphism 1802 1 256.01 8 biotite conventional K-Ar 2 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.53 33.78 93 age of later metamorphism 1803 1 350.51 10 biotite conventional K-Ar 3 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.51 47.4 100 initial age disturbed by later metamorphism 1804 1 301.02 9 biotite conventional K-Ar 4 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 3.48 16.413 initial age disturbed by later metamorphism 1805 1 252.61 8 biotite conventional K-Ar 5 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 5.89 22.993 89 age of later metamorphism 1806 1 299.79 9 biotite conventional K-Ar 6 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 6.5 30.52 100 initial age disturbed by later metamorphism 1807 1 254.89 8 biotite conventional K-Ar 7 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 31.02 89 age of later metamorphism 1808 1 405.85 12 biotite conventional K-Ar 8 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 2.86 18.74 86 minimum age of intrusion 1809 1 393.07 12 biotite conventional K-Ar 9 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.27 52.29 98 minimum age of intrusion 1810 1 382.95 11 biotite conventional K-Ar 10 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 6.68 41.03 100 minimum age of intrusion 1811 1 267.56 8 biotite conventional K-Ar 11 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 7.35 30.52 98 age of later metamorphism 1812 1 303.12 9 muscovite conventional K-Ar 12 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 10.53 50.04 90 initial age disturbed by later metamorphism 1813 1 374.95 11 biotite conventional K-Ar 13 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.59 51.54 87 minimum age of intrusion 1814 1 284.45 8 biotite conventional K-Ar 14 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.63 38.28 99 initial age disturbed by later metamorphism 1815 1 332.26 10 biotite conventional K-Ar 15 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 43.28 93 initial age disturbed by later metamorphism 1816 1 364.15 11 biotite conventional K-Ar 16 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 6.03 35.03 96 minimum age of metamorphic crystallization 1817 1 370.03 11 biotite conventional K-Ar 17 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 4.02 23.77 93 minimum age of metamorphic crystallization 1818 1 380.38 11 biotite conventional K-Ar 18 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 50.54 96 minimum age of intrusion 1819 1 396.41 12 biotite conventional K-Ar 19 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.86 56.55 100 minimum age of intrusion 1820 1 357.8 11 biotite conventional K-Ar 20 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 47.29 92 minimum age of intrusion 1821 1 360.69 11 biotite conventional K-Ar 21 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 5.92 34.03 93 initial age disturbed by later metamorphism 1822 1 334.07 10 biotite conventional K-Ar 22 (MAINE) "4.72E-04, 0.585E-04, 1.19E-04*" 4.83 25.52 100 initial age disturbed by later metamorphism 1823 1 407.03 8 biotite conventional K-Ar ME-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.86 51.67 76 initial age disturbed by later metamorphism ARGON VALUE IS AVERAGE OF REPLICATE DETERMATIONS 1824 1 361.93 7 biotite conventional K-Ar ME-3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.96 40.16 74 initial age disturbed by later metamorphism ARGON VALUE IS AVERAGE OF REPLICATE DETERMINATIONS 1825 1 366.95 7 biotite conventional K-Ar ME-4A "4.72E-04, 0.585E-04, 1.19E-04*" 7.43 43.53 87 initial age disturbed by later metamorphism CONCENTRATE HEADS 1825 2 357.56 7 biotite conventional K-Ar ME-4B "4.72E-04, 0.585E-04, 1.19E-04*" 7.47 42.53 77 initial age disturbed by later metamorphism TAILS OF MINERAL CONCENTRATE 1826 1 407.81 8 biotite conventional K-Ar ME-5 "4.72E-04, 0.585E-04, 1.19E-04*" 7.52 49.54 94 initial age disturbed by later metamorphism ARGON VALUE IS AVERAGE OF REPLICATE DETERMINATIONS 1827 1 364.32 7 biotite conventional K-Ar ME-6 "4.72E-04, 0.585E-04, 1.19E-04*" 6.71 39 86 age of intrusion ARGON VALUE IS AVERAGE OF 2 DETERMINATIONS 1828 1 364.03 7 biotite conventional K-Ar ME-7 "4.72E-04, 0.585E-04, 1.19E-04*" 5.86 34.03 83 age of intrusion 1829 1 474 9 biotite conventional K-Ar ME-8 "4.72E-04, 0.585E-04, 1.19E-04*" 5.19 40.53 72 age of intrusion ARGON VALUE IS AVERAGE OF REPLICATE DETERMINATIONS 1830 1 387.34 7 biotite conventional K-Ar ME-9A "4.72E-04, 0.585E-04, 1.19E-04*" 5.31 33.03 82 initial age disturbed by later metamorphism CONCENTRATE HEADS 1830 2 381.24 7 biotite conventional K-Ar ME-9B "4.72E-04, 0.585E-04, 1.19E-04*" 4.83 29.52 68 initial age disturbed by later metamorphism TAILS OF MINERAL CONCENTRATE 1831 1 367.18 7 biotite conventional K-Ar ME-10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.45 49.54 96 age of intrusion 1832 1 398.2 8 biotite conventional K-Ar ME-11 "4.72E-04, 0.585E-04, 1.19E-04*" 6.63 42.53 81 minimum age of intrusion 1833 1 407.2 8 biotite conventional K-Ar ME-13 "4.72E-04, 0.585E-04, 1.19E-04*" 7.04 46.3 88 age of metamorphic crystallization ARGON VALUE IS AVERAGE OF 3 DETERMINATIONS 1834 1 410.37 8 biotite conventional K-Ar ME-13 "4.72E-04, 0.585E-04, 1.19E-04*" 5.82 38.61 88 minimum age of intrusion ARGON VALUE IS AVERAGE OF 3 DETERMINATIONS 1835 1 414.79 8 biotite conventional K-Ar ME-14 "4.72E-04, 0.585E-04, 1.19E-04*" 6.82 45.79 89 minimum age of intrusion 1836 1 414.21 8 biotite conventional K-Ar ME-15 "4.72E-04, 0.585E-04, 1.19E-04*" 6.98 46.79 89 age of intrusion 1837 1 412 8 biotite conventional K-Ar ME-16 "4.72E-04, 0.585E-04, 1.19E-04*" 6.27 41.78 92 initial age disturbed by later metamorphism 1838 1 365.11 7 biotite conventional K-Ar ME-17 "4.72E-04, 0.585E-04, 1.19E-04*" 4.6 26.8 76 initial age disturbed by later metamorphism ARGON VALUE IS AVERAGE OF REPLICATE DETERMINATIONS 1840 1 376.46 7 biotite conventional K-Ar ME-19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 49.54 94 age of intrusion 1841 1 374.8 7 biotite conventional K-Ar ME-20 "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 45.04 71 minimum age of intrusion 1842 1 343.39 7 biotite conventional K-Ar ME-21 "4.72E-04, 0.585E-04, 1.19E-04*" 6.8 37.03 84 minimum age of intrusion 1843 1 377.16 7 biotite conventional K-Ar ME-22 "4.72E-04, 0.585E-04, 1.19E-04*" 8.41 50.79 89 age of intrusion 1844 1 379.93 7 biotite conventional K-Ar ME-23 "4.72E-04, 0.585E-04, 1.19E-04*" 6.78 41.28 90 minimum age of intrusion 1845 1 404.39 8 biotite conventional K-Ar ME-24 "4.72E-04, 0.585E-04, 1.19E-04*" 4.6 30.02 93 age of intrusion 1846 1 391.67 8 biotite conventional K-Ar ME-26 "4.72E-04, 0.585E-04, 1.19E-04*" 7.39 46.54 98 age of intrusion 1847 1 401.24 8 biotite conventional K-Ar ME-27 "4.72E-04, 0.585E-04, 1.19E-04*" 6.69 43.28 89 age of intrusion 1848 1 390.8 8 biotite conventional K-Ar ME-28A "4.72E-04, 0.585E-04, 1.19E-04*" 9 56.54 98 age of intrusion 1848 2 394.63 8 biotite conventional K-Ar ME-28B "4.72E-04, 0.585E-04, 1.19E-04*" 9.18 58.3 99 age of intrusion 1849 1 384.11 7 biotite conventional K-Ar ME-29 "4.72E-04, 0.585E-04, 1.19E-04*" 6.82 42.03 88 age meaning uncertain (analysis questionable) 1850 1 401.44 8 biotite conventional K-Ar ME-30 "4.72E-04, 0.585E-04, 1.19E-04*" 6.3 40.78 96 age of intrusion 1851 1 402.07 8 biotite conventional K-Ar ME-31 "4.72E-04, 0.585E-04, 1.19E-04*" 7.37 47.79 81 age of intrusion 1852 1 394.65 8 biotite conventional K-Ar ME-32 "4.72E-04, 0.585E-04, 1.19E-04*" 8.43 53.54 99 age of intrusion 1853 1 390.87 8 biotite conventional K-Ar ME-33 "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 54.54 100 age of intrusion 1854 1 391.59 8 biotite conventional K-Ar ME-34 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 56.29 82 age of intrusion 1855 1 408.1 8 biotite conventional K-Ar ME-35 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 58.15 99 age of intrusion ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 1856 1 366.51 7 whole rock conventional K-Ar ME-36 "4.72E-04, 0.585E-04, 1.19E-04*" 4.96 29.02 95 age meaning uncertain (analysis questionable) 1857 1 363.17 8 biotite conventional K-Ar ME-37 "4.72E-04, 0.585E-04, 1.19E-04*" 9.33 54.04 100 initial age disturbed by later metamorphism 1858 1 373.07 7 biotite conventional K-Ar ME-38 "4.72E-04, 0.585E-04, 1.19E-04*" 9.35 55.79 90 age of intrusion 1859 1 364.25 7 biotite conventional K-Ar ME-39 "4.72E-04, 0.585E-04, 1.19E-04*" 8.31 48.29 92 minimum age of intrusion 1860 1 370.79 7 biotite conventional K-Ar ME-40 "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 50.79 63 minimum age of intrusion 1862 1 394.21 8 biotite conventional K-Ar ME-42 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 53.79 77 age of intrusion 1863 1 336.25 7 biotite conventional K-Ar ME-43 "4.72E-04, 0.585E-04, 1.19E-04*" 6.16 32.78 99 initial age disturbed by later metamorphism 1863 2 382.88 8 muscovite conventional K-Ar ME-43 "4.72E-04, 0.585E-04, 1.19E-04*" 10.43 64.05 91 minimum age of intrusion 1864 1 312.22 6 biotite conventional K-Ar NH-1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.24 35.53 99 age of intrusion 1864 2 239.1 5 muscovite conventional K-Ar NH-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.83 25.14 93 minimum age of metamorphic crystallization ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 1865 1 289.74 6 biotite conventional K-Ar NH-2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.8 30.77 97 initial age disturbed by later metamorphism 1865 2 263.08 5 muscovite conventional K-Ar NH-2 "4.72E-04, 0.585E-04, 1.19E-04*" 10.43 42.53 99 initial age disturbed by later metamorphism 1866 1 251.36 5 biotite conventional K-Ar NH-3 "4.72E-04, 0.585E-04, 1.19E-04*" 9.15 35.53 97 initial age disturbed by later metamorphism 1866 2 251.57 5 muscovite conventional K-Ar NH-3 "4.72E-04, 0.585E-04, 1.19E-04*" 10.75 41.78 99 initial age disturbed by later metamorphism 1867 1 285.41 6 muscovite conventional K-Ar NH-5 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 40.78 96 initial age disturbed by later metamorphism 1869 1 253.31 5 biotite conventional K-Ar NH-6 "4.72E-04, 0.585E-04, 1.19E-04*" 9.33 36.53 96 initial age disturbed by later metamorphism 1870 1 269.13 5 biotite conventional K-Ar NH-7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.52 39.78 97 initial age disturbed by later metamorphism 1871 1 140.34 3 biotite conventional K-Ar VT-2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.43 13.51 92 age of metamorphic crystallization 1872 1 127.84 2 biotite conventional K-Ar VT-3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.96 17.09 81 age of intrusion 1873 1 340.67 6 biotite conventional K-Ar VT-4 "4.72E-04, 0.585E-04, 1.19E-04*" 9.64 52.04 99 age not evaluated 1875 1 413.23 8 muscovite conventional K-Ar VT-7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.58 64.05 97 initial age disturbed by later metamorphism 1878 1 330.34 6 biotite conventional K-Ar VT-12 "4.72E-04, 0.585E-04, 1.19E-04*" 9.54 49.79 99 initial age disturbed by later metamorphism 1878 2 343.84 7 muscovite conventional K-Ar VT-12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 46.79 99 initial age disturbed by later metamorphism 1879 1 356.4 7 biotite conventional K-Ar VT-19 "4.72E-04, 0.585E-04, 1.19E-04*" 9.57 54.29 99 age of intrusion (PUBLISHED POTASSIUM VALUE IS WRONG--COMPILER) 1887 1 1112.06 40 hornblende conventional K-Ar 822-2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.32 29.22 AGE APPEARS TO BE TOO OLD 1899 1 1105 whole rock 39Ar-40Ar total fusion L-5 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 40AR/39AR TOTAL FUSION AGE 1899 2 1135 whole rock 39Ar-40Ar incremental (plateau) L-5 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 40AR/39AR PLATEAU AGE 1900 1 1155 whole rock 39Ar-40Ar total fusion MN38 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism SLIGHTLY ALTERED AUGITE 40AR/39AR TOTAL FUSION AGE SAMPLE MAY HAVE BEEN AFFECTED BY INTRUSION OF DULUTH COMPLEX AT 1100 M.Y. 1900 2 1172 whole rock 39Ar-40Ar incremental (plateau) MN38 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism SLIGHTLY ALTERED AUGITE 40AR/39AR PLATEAU AGE SAMPLE MAY HAVE BEEN AFFECTED BY INTRUSION OF DULUTH COMPLEX AT 1100 M.Y. 1901 1 1081 whole rock 39Ar-40Ar total fusion RP-1 "4.72E-04, 0.585E-04, 1.19E-04" age of later metamorphism 40AR/39AR TOTAL FUSION AGE 1901 2 1095 whole rock 39Ar-40Ar incremental (plateau) RP-1 "4.72E-04, 0.585E-04, 1.19E-04" age of later metamorphism 40AR/39AR PLATEAU AGE 1902 1 1082 whole rock 39Ar-40Ar total fusion T164 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 40AR/39AR TOTAL FUSION AGE; MAXIUMUM STEP-RELEASE AGE IS 1138 M.Y. 1903 1 2137 whole rock 39Ar-40Ar total fusion MN9 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion 40AR/39AR TOTAL FUSION AGE "WHOLE ROCK K-AR AGE IS 2240 M.Y. (HANSON AND MALHOTRA, 1971)" 1904 1 1263.45 hornblende conventional K-Ar 0.4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.564 14.86 initial age disturbed by later metamorphism RADIOGENIC ARGON IS GREATER THAN 93% ARGON LOSS BY THERMAL METAMORPHISM DUE TO EMPLACEMENT OF DULUTH COMPLEX AT 1100 M.Y. 1906 1 2046.43 hornblende conventional K-Ar 1.7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.728 39.88 initial age disturbed by later metamorphism RADIOGENIC ARGON IS MORE THAN 93% ARGON LOSS BY THERMAL METAMORPHISM DUE TO EMPLACEMENT OF DULUTH COMPLEX AT 1100 M.Y. 1906 2 1110.26 biotite conventional K-Ar 1.7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 199.9 initial age disturbed by later metamorphism RADIOGENIC ARGON IS MORE THAN 93% 1909 1 2632.62 hornblende conventional K-Ar 9.5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.645 55.33 minimum age of intrusion RADIOGENIC ARGON IS MORE THAN 93% 1912 1 2626.84 hornblende conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5736 49 "anomalous initial isotopic composition, age questionable" FIELD NUMBER SS-4 K2O% AND 40AR-RAD(MOL/GM) COMPUTED BY COMPILER 1918 1 2707.32 135 hornblende conventional K-Ar M8185 "4.72E-04, 0.584E-04, 1.19E-04*" 1.064 96.3 98 minimum age of metamorphic crystallization POTASSIUM VALUE IS AVERAGE OF TWO MEASUREMENTS BY X-RAY FLUORESCENCE 1919 1 2071.74 105 hornblende conventional K-Ar M8132 "4.72E-04, 0.584E-04, 1.19E-04*" 0.456 25.5 94 age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES. POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1920 1 1792.91 90 whole rock conventional K-Ar M8305 "4.72E-04, 0.584E-04, 1.19E-04*" 1.24 54.8 96 "minimum age of intrusion, age of later metamorphism" POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES. POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1921 1 1718.05 85 hornblende conventional K-Ar M8306 "4.72E-04, 0.584E-04, 1.19E-04*" 0.82 33.9 90 age of intrusion POTASSIUM VALUE IS AVERAGE OF TWO MEASUREMENTS MADE BY X-RAY FLUORESCENCE 1922 1 1919.16 95 hornblende conventional K-Ar M8313 "4.72E-04, 0.584E-04, 1.19E-04*" 0.347 17.1 93 age meaning uncertain (analysis questionable) POTASSIUM VALUE IS AVERAGE OF TWO MEASUREMENTS MADE BY X-RAY FLUORESCENCE 1923 1 1724.75 85 hornblende conventional K-Ar M8314 "4.72E-04, 0.584E-04, 1.19E-04*" 0.892 37.1 96 age of intrusion POTASSIUM VALUE IS AVERAGE OF TWO MEASUREMENTS MADE BY X-RAY FLUORESCENCE 1923 2 1763.5 90 biotite conventional K-Ar M8314 "4.72E-04, 0.584E-04, 1.19E-04*" 8.99 387.1 96 age of intrusion POTASSIUM VALUE IS AVERAGE OF THREE MEASUREMENTS MADE BY X-RAY FLUORESCENCE 1924 1 1681.73 85 hornblende conventional K-Ar M8315 "4.72E-04, 0.584E-04, 1.19E-04*" 1.35 54 82 minimum age of intrusion POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1924 2 1792.27 90 biotite conventional K-Ar M8315 "4.72E-04, 0.584E-04, 1.19E-04*" 9.26 409 96 age of intrusion POTASSIUM VALUE IS AVERAGE OF TWO MEASUREMENTS MADE BY X-RAY FLUORESCENCE 1925 1 2641 135 biotite conventional K-Ar 3 "4.72E-04, 0.58E-04, 1.22E-04*" 5.48 473 92 age of intrusion 1926 1 450 glauconite conventional K-Ar KA113 "4.72E-04, 0.583E-04" 7.86 minimum age of volcanism 40-60 MESH 1927 1 430 glauconite conventional K-Ar KA 114 "4.72E-04, 0.583E-04" 7.99 minimum age of volcanism 40-60 MESH 1928 1 1208 illite group conventional K-Ar KA50 "4.72E-04, 0.583E-04*" 5.17 128 minimum age of volcanism "SAMPLE COMPOSED OF 60% 2M-ILLITE, 3% CHLORITE, AND 37% PYROPHYLLITE, HEMATITE, ETC.; 40-60 MESH" ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES. 1936 1 1688.89 51 whole rock conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.953 38.37 98 minimum age of metamorphic crystallization FIELD NUMBER MN-3 POTASSIUM DETERMINED BY X-RAY FLUORESCENCE; ARGON VALUE IS AVERAGE OF 2 ANALYSES 1937 1 1571.42 47 whole rock conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.575 20.75 89 minimum age of metamorphic crystallization FIELD NUMBER MN-4 POTASSIUM VALUE IS AVERAGE OF 5 SAMPLES; POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1938 1 1527.21 23 whole rock conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 1.143 39.53 99 minimum age of metamorphic crystallization FIELD NUMBER MN-5 POTASSIUM VALUE IS AVERAGE OF 2 DETERMINATIONS BY X-RAY FLUORESCENCE 1939 1 1981.21 40 hornblende conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.575 29.85 95 minimum age of intrusion "FIELD NUMBER MN-7, HORNBLENDE PARTIALLY ALTERED TO ACTINOLITE" POTASSIUM AND ARGON VALUES ARE AVERAGES OF 2 DETERMINATIONS; POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1939 2 1977.47 40 whole rock conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.982 50.82 99 minimum age of intrusion FIELD NUMBER MN-7 POTASSIUM VALUE IS AVERAGE OF 3 DETERMINATIONS BY X-RAY FLUORESCENCE 1940 1 1954.27 195 pyroxenes conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.29 14.72 96 minimum age of intrusion FIELD NUMBER MN-8; ANALYZED MATERIAL CONTAINS PYROXENE PLUS HORNBLENDE AND BIOTITE POTASSIUM VALUE IS AVERAGE OF 2 DETERMINATIONS BY X-RAY FLUORESCENCE 1940 2 1768.76 35 whole rock conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.917 39.67 98 age not evaluated FIELD NUMBER MN-8 POTASSIUM AND ARGON VALUES ARE AVERAGES OF 2 DETERMINATIONS; POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1941 1 2228.73 224 whole rock conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 0.3 19.01 94 minimum age of intrusion FIELD NUMBER MN-9 ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES; POTASSIUM VALUE IS AVERAGE OF 3 DETERMINATIONS BY X-RAY FLUORESCENCE 1942 1 1739.88 52 whole rock conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 0.907 38.24 98 age of metamorphic crystallization FIELD NUMBER MN-12 POTASSIUM VALUE IS AVERAGE OF 3 DETERMINATIONS BY X-RAY FLUORESCENCE 1943 1 1634.58 50 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 0.705 27 97 age of metamorphic crystallization FIELD NUMBER MN-13 POTASSIUM VALUE IS AVERAGE OF 3 DETERMINATIONS BY X-RAY FLUORESCENCE 1944 1 1403.02 42 whole rock conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 0.971 29.67 98 minimum age of metamorphic crystallization FIELD NUMBER MN-14 POTASSIUM VALUE IS AVERAGE OF 3 DETERMINATIONS MADE BY X-RAY FLUORESCENCE 1945 1 1032.27 30 whole rock conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 0.545 10.93 87 age of intrusion FIELD NUMBER ON23 POTASSIUM VALUE IS AVERAGE OF 2 DETERMINATIONS MADE BY X-RAY FLUORESCENCE 1946 1 1109.58 33 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.541 11.94 91 age of intrusion FIELD NUMBER SH-45 POTASSIUM AND ARGON VALUES ARE AVERAGES OF 2 DETERMINATIONS; POTASSIUM DETERMINED BY X-RAY FLUORESCENCE 1947 1 1061.84 15 whole rock conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 1.226 25.52 97 age of intrusion FIELD NUMBER MN-15 POTASSIUM VALUE IS AVERAGE OF 2 DETERMINATIONS BY X-RAY FLUORESCENCE 1948 1 439 16 hornblende conventional K-Ar L-853H "4.72E-04, 0.583E-04*" 5.7 40.78 96 minimum age of metamorphic crystallization HORNBLENDE SEPARATE ESSENTIALLY PURE AND UNALTERED HIGH POTASSIUM CONTENT FOR HORNBLENDE CONCENTRATE--COMPILER 1949 1 321 12 hornblende conventional K-Ar L-857 H "4.72E-04, 0.583E-04*" 1.81 9.157 95 initial age disturbed by later metamorphism 1950 1 310 12 hornblende conventional K-Ar L-858H "4.72E-04, 0.583E-04" 1.22 7.031 97 initial age disturbed by later metamorphism NO VISIBLE BIOTITE IN HORNBLENDE SEPARATE; 99% PURE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 1950 2 318.82 12 biotite conventional K-Ar L-858B "4.72E-04, 0.583E-04*" 8.72 43.78 86 initial age disturbed by later metamorphism 1951 1 331 12 muscovite conventional K-Ar L-860M "4.72E-04, 0.583E-04*" 8.89 46.54 80 initial age disturbed by later metamorphism MUSCOVITE SEPARATE NEARLY PURE; 1% CHLORITE 1952 1 287 11 hornblende conventional K-Ar L-861H "4.72E-04, 0.583E-04*" 1.22 5.454 94 initial age disturbed by later metamorphism "HORNBLENDE SEPARATE HAS 2% IMPURITIES, NO BIOTITE" 1953 1 295 11 biotite conventional K-Ar L-864B "4.72E-04, 0.583E-04" 9.08 29.27 79 initial age disturbed by later metamorphism BIOTITE SEPARATE HAS ABOUT 1% IMPURITIES 1954 1 337 13 muscovite conventional K-Ar L-865M "4.72E-04, 0.583E-04*" 9.48 50.54 82 initial age disturbed by later metamorphism NEARLY PURE MUSCOVITE SEPARATE 1955 1 305 12 biotite conventional K-Ar L-866B "4.72E-04, 0.583E-04*" 9.79 46.79 80 initial age disturbed by later metamorphism COARSE BIOTITE SEPARATE; PURE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 1956 1 317 9 muscovite conventional K-Ar L-867M "4.72E-04, 0.583E-04*" 10.63 53.04 85 initial age disturbed by later metamorphism MUSCOVITE SEPARATE IS ABOUT 98% PURE; 1% BIOTITE 1957 1 302 8 muscovite conventional K-Ar L-870M "4.72E-04, 0.583E-04*" 10.24 48.54 93 minimum age of intrusion SEPARATED MUSCOVITE IS ABOUT 95% PURE; SOME BIOTITE 1958 1 292 11 muscovite conventional K-Ar L-872M "4.72E-04, 0.583E-04*" 10.98 50.04 95 initial age disturbed by later metamorphism "MUSCOVITE SEPARATE ABOUT 98% PURE, SOME BIOTITE" 1959 1 263 10 biotite conventional K-Ar L-873B "4.72E-04, 0.583E-04*" 7.99 32.53 95 age of later metamorphism REDDISH-BROWN BIOTITE SEPARATE WITH 2% IMPURITIES 1960 1 291 11 biotite conventional K-Ar L-874B "4.72E-04, 0.583E-04*" 8.7 39.53 91 initial age disturbed by later metamorphism SEPARATED BIOTITE IS 99% PURE 1961 1 265 11 biotite conventional K-Ar L-875B "4.72E-04, 0.583E-04" 6.39 31.77 85 initial age disturbed by later metamorphism BIOTITE FRACTION IS ABOUT 95% PURE 1961 2 421 16 hornblende conventional K-Ar L-875H "4.72E-04, 0.583E-04*" 0.634 4.328 77 initial age disturbed by later metamorphism TRACE OF BIOTITE IN HORNBLENDE CONCENTRATE POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 1962 1 244 10 muscovite conventional K-Ar L-879M "4.72E-04, 0.583E-04*" 10.45 39.28 92 age of later metamorphism 1963 1 331 13 muscovite conventional K-Ar L-881M "4.72E-04, 0.583E-04*" 10.52 55.04 91 initial age disturbed by later metamorphism "COARSE BOOK MUSCOVITE, 98% PURE" 1964 1 288 11 muscovite conventional K-Ar L-882M "4.72E-04, 0.583E-04*" 8.92 40.03 88 initial age disturbed by later metamorphism ABOUT 98% PURE 1965 1 309 12 biotite conventional K-Ar L-980B "4.72E-04, 0.583E-04*" 9.53 46.29 89 initial age disturbed by later metamorphism ESSENTIALLY PURE AND UNALTERED 1966 1 340 13 biotite conventional K-Ar L-981B "4.72E-04, 0.583E-04*" 9.25 49.79 92 initial age disturbed by later metamorphism SOME ALTERED BIOTITE 1967 1 323 13 biotite conventional K-Ar L-982B "4.72E-04, 0.583E-04*" 9.1 46.29 94 initial age disturbed by later metamorphism BIOTITE APPEARS UNALTERED 1968 1 307 13 biotite conventional K-Ar L-983B "4.72E-04, 0.583E-04*" 8.68 41.78 94 initial age disturbed by later metamorphism BIOTITE CONCENTRATE IS 95% PURE 1969 1 377 15 biotite conventional K-Ar L-984B "4.72E-04, 0.583E-04*" 8 48.29 92 initial age disturbed by later metamorphism SEPARATED BIOTITE APPEARS UNALTERED AND IS ESSENTIALLY PURE 1970 1 368 14 biotite conventional K-Ar L-985B "4.72E-04, 0.583E-04*" 6.89 40.53 94 initial age disturbed by later metamorphism "SEPARATED BIOTITE APPEARS VERY FRESH, 95% PURE CONCENTRATE" 1971 1 343 13 biotite conventional K-Ar L-986B "4.72E-04, 0.583E-04*" 8.18 44.53 94 initial age disturbed by later metamorphism "BIOTITE IS VERY FRESH IN APPEARANCE, 98% PURE CONCENTRATE" 1972 1 401 16 hornblende conventional K-Ar L-987H "4.72E-04, 0.583E-04*" 1.2 7.756 81 initial age disturbed by later metamorphism SEPARATED HORNBLENDE IS BLACK IN APPEARANCE WITH ONLY A TRACE OF IMPURITIES 1973 1 337 13 biotite conventional K-Ar L-988B "4.72E-04, 0.583E-04*" 8.83 47.04 89 BIOTITE 98% PURE 1974 1 287 11 biotite conventional K-Ar L-989B "4.72E-04, 0.583E-04*" 7.77 34.78 92 initial age disturbed by later metamorphism 5% CHLORITE AND 5% IMPURITIES IN BIOTITE CONCENTRATE 1975 1 260 10 biotite conventional K-Ar L-990B "4.72E-04, 0.583E-04*" 7.76 31.27 89 age of later metamorphism SLIGHTLY ALTERED WITH 5% CHLORITE AND 2% IMPURITIES 1976 1 280 10 biotite conventional K-Ar L-991B "4.72E-04, 0.583E-04*" 6.53 28.52 88 initial age disturbed by later metamorphism MODERATELY-ALTERED CONCENTRATE WITH 10% CHLORITE AND 3% QUARTZ-FELDSPAR 1977 1 327 13 biotite conventional K-Ar L-992B "4.72E-04, 0.583E-04*" 8.72 45.04 92 initial age disturbed by later metamorphism BIOTITE APPEARS QUITE FRESH 1978 1 335 13 biotite conventional K-Ar L-993B "4.72E-04, 0.583E-04*" 8.49 45.04 93 initial age disturbed by later metamorphism SEPARATED BIOTITE HAS ABOUT 3% IMPURITIES INCLUDING MUSCOVITE 1979 1 447 17 biotite conventional K-Ar L-994B "4.72E-04, 0.583E-04*" 7.52 54.92 97 minimum age of metamorphic crystallization VERY FRESH BIOTITE ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 1980 1 353 14 biotite conventional K-Ar L-995B "4.72E-04, 0.583E-04*" 8.33 46.79 87 initial age disturbed by later metamorphism BIOTITE HAS ABOUT 5% IMPURITIES (QUARTZ) 1981 1 370 15 biotite conventional K-Ar L-996B "4.72E-04, 0.583E-04" 8.08 53.41 95 initial age disturbed by later metamorphism BIOTITE CONCENTRATE WITH 1% IMPURITIES ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 1982 1 407 16 biotite conventional K-Ar L-997B "4.72E-04, 0.583E-04*" 8.65 56.79 84 initial age disturbed by later metamorphism "BIOTITE APPEARS QUITE FRESH, 99% CONCENTRATE" 1983 1 342 13 biotite conventional K-Ar L-998 "4.72E-04, 0.583E-04*" 8.12 44.03 76 initial age disturbed by later metamorphism SEPARATED BIOTITE APPEARS MODERATELY ALTERED IN PART 1984 1 369 14 hornblende conventional K-Ar L-1001H "4.72E-04, 0.583E-04*" 1.02 6.005 64 initial age disturbed by later metamorphism GREEN HORNBLENDE CONTAINS LESS THAN 1% BIOTITE 1984 2 336 13 biotite conventional K-Ar L-1001B "4.72E-04, 0.583E-04*" 9 47.79 94 initial age disturbed by later metamorphism UNALTERED BIOTITE WITH 1% CHLORITE 1985 1 320 12 biotite conventional K-Ar L-1002B "4.72E-04, 0.583E-04*" 9.23 46.54 92 initial age disturbed by later metamorphism BIOTITE CONCENTRATE IS 98% PURE 1986 1 269 11 biotite conventional K-Ar L-1003B "4.72E-04, 0.583E-04*" 7.86 32.78 84 initial age disturbed by later metamorphism BIOTITE APPEARS VERY FRESH AND UNALTERED 1987 1 266 10 biotite conventional K-Ar L-1004B "4.72E-04, 0.583E-04*" 8.96 37.03 91 age of later metamorphism 1988 1 333 13 biotite conventional K-Ar L-1005B "4.72E-04, 0.583E-04*" 6.33 33.28 91 initial age disturbed by later metamorphism BIOTITE CONCENTRATE CONTAINED 5% CHLORITE AND 1% IMPURITIES 1989 1 305 12 biotite conventional K-Ar L-1006B "4.72E-04, 0.583E-04*" 9.68 46.29 92 initial age disturbed by later metamorphism VERY FRESH BIOTITE 1990 1 266 10 biotite conventional K-Ar L-1008B "4.72E-04, 0.583E-04*" 8.14 33.53 86 age of later metamorphism "REDDISH BIOTITE, SOME ALTERED GRAINS" 1991 1 322 13 biotite conventional K-Ar L-1009B "4.72E-04, 0.583E-04*" 6.99 35.53 88 initial age disturbed by later metamorphism BIOTITE CONCENTRATE WITH 5% CHLORITE AND 2% QUARTZ-FELDSPAR ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 1992 1 345 14 biotite conventional K-Ar L-1010B "4.72E-04, 0.583E-04*" 8.17 44.78 91 initial age disturbed by later metamorphism BIOTITE CONCENTRATE PLUS 2% CHLORITE AND 2% IMPURITIES 1993 1 317 12 biotite conventional K-Ar L-1011B "4.72E-04, 0.583E-04*" 5.87 29.27 73 initial age disturbed by later metamorphism BIOTITE MODERATELY ALTERED WITH 10% CHLORITE 1994 1 463 18 biotite conventional K-Ar L-1012B "4.72E-04, 0.583E-04*" 8.82 67.05 96 minimum age of metamorphic crystallization VERY FRESH BIOTITE WITH ABOUT 3% CHLORITE 1995 1 374 15 hornblende conventional K-Ar 1088H "4.72E-04, 0.583E-04*" 0.329 1.97 51 initial age disturbed by later metamorphism GREENISH HORNBLENDE SEPARATE 1996 1 356 14 biotite conventional K-Ar L-1089B "4.72E-04, 0.583E-04*" 8.57 48.54 95 initial age disturbed by later metamorphism REDDISH BIOTITE CONCENTRATE PLUS 2% CHLORITE AND IMPURITIES 1997 1 335 13 biotite conventional K-Ar L-1090B "4.72E-04, 0.583E-04*" 5.2 27.52 85 initial age disturbed by later metamorphism COARSE BIOTITE APPEARS MODERATELY ALTERED POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 1997 2 362 14 muscovite conventional K-Ar L-1090M "4.72E-04, 0.583E-04*" 10.58 61.05 85 minimum age of intrusion 1998 1 363 14 biotite conventional K-Ar L-1092B "4.72E-04, 0.583E-04*" 8.72 50.54 95 initial age disturbed by later metamorphism VERY FRESH BIOTITE 1999 1 373 14 hornblende conventional K-Ar L-1096H "4.72E-04, 0.583E-04*" 1.37 8.18 79 initial age disturbed by later metamorphism 2000 1 396 15 biotite conventional K-Ar L-1096 B "4.72E-04, 0.583E-04*" 8.01 51.05 95 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES 2001 1 345 13 biotite conventional K-Ar L-1098B "4.72E-04, 0.583E-04*" 9.63 52.74 84 initial age disturbed by later metamorphism BIOTITE CONCENTRATE IS 98% PURE POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES 2002 1 404 16 hornblende conventional K-Ar L-1099H "4.72E-04, 0.583E-04*" 0.58 3.78 79 initial age disturbed by later metamorphism PURE HORNBLENDE SEPARATE 2003 1 368 14 biotite conventional K-Ar L-1100B "4.72E-04, 0.583E-04*" 7.96 46.79 94 initial age disturbed by later metamorphism "NEARLY PURE BIOTITE SEPARATE, TRACE OF MUSCOVITE" E-10/YR 2004 1 361 14 biotite conventional K-Ar L-1101B "4.72E-04, 0.583E-04*" 7.92 45.54 94 initial age disturbed by later metamorphism UNALTERED BIOTITE CONCENTRATE WITH 2% AMPHIBOLE 2005 1 377 15 muscovite conventional K-Ar L-1101 "4.72E-04, 0.583E-04*" 9.12 55.04 84 minimum age of intrusion MUSCOVITE CONCENTRATE CONTAINS 1% BIOTITE 2006 1 404 16 hornblende conventional K-Ar L-1102H "4.72E-04, 0.583E-04*" 0.45 2.93 64 initial age disturbed by later metamorphism 2007 1 355 13 biotite conventional K-Ar L-1103B "4.72E-04, 0.583E-04*" 7.3 41.28 93 initial age disturbed by later metamorphism BIOTITE APPEARS MODERATELY ALTERED; 3% IMPURITIES (MOSTLY CHLORITE) POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 2008 1 430 17 biotite conventional K-Ar L-1104B "4.72E-04, 0.583E-04" 7.01 57.96 76 minimum age of metamorphic crystallization POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES 2009 1 406 16 hornblende conventional K-Ar L-1104H "4.72E-04, 0.583E-04*" 0.27 1.77 68 initial age disturbed by later metamorphism PURE HORNBLENDE SEPARATE POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES 2010 1 347 13 biotite conventional K-Ar L-1105B "4.72E-04, 0.583E-04*" 9.08 50.04 91 initial age disturbed by later metamorphism "BIOTITE SEPARATE ABOUT 98% PURE, REST MUSCOVITE AND IMPURITIES" 2011 1 369 14 biotite conventional K-Ar L-1106B "4.72E-04, 0.583E-04*" 8.88 52.29 94 initial age disturbed by later metamorphism ABOUT 1% CHLORITE WITH AGGREGATE IN BIOTITE CONCENTRATE 2012 1 399 16 biotite conventional K-Ar L-1107B "4.72E-04, 0.583E-04*" 7.93 51.04 96 initial age disturbed by later metamorphism PURE BIOTITE 2013 1 322 13 biotite conventional K-Ar L-1108B "4.72E-04, 0.583E-04*" 9.31 47.29 76 initial age disturbed by later metamorphism 2014 1 351 13 biotite conventional K-Ar L-1109B "4.72E-04, 0.583E-04*" 7.41 41.28 94 initial age disturbed by later metamorphism MODERATELY-ALTERED BIOTITE; CONCENTRATE CONTAINS 5% CHLORITE AND IMPURITIES 2015 1 453 18 hornblende conventional K-Ar L-1110H "4.72E-04, 0.583E-04*" 3.91 29.02 95 initial age disturbed by later metamorphism ABOUT 2% BIOTITE IN HORNBLENDE CONCENTRATE POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES WHOLE-ROCK RB-SR GIVES 570+/-15 M.Y. 2029 1 160.93 3 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.85 16.6 86 age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE DETERMINATIONS 2030 1 175.09 3 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.54 19.96 95 age of intrusion 2031 1 186.98 4 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 23.23 92 age of intrusion 2032 1 171.36 3 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.18 21.17 95 age of intrusion 2033 1 173.8 3 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 7.18 18.86 91 minimum age of intrusion 2034 1 184.51 4 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 21.9 95 age of intrusion 2035 1 117 2 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 14.41 86 age of intrusion 2036 1 161.28 3 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.09 19.65 93 age of intrusion 2037 1 151.44 3 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 7.8 17.74 86 age of intrusion 2038 1 115.18 2 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 14.88 90 age of intrusion 2039 1 120.21 2 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 14.46 91 age of intrusion ARGON VALUE IS AVERAGE OF TWO ANALYSES 2040 1 112.47 2 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 13.6 76 age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES 2041 1 115.48 2 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 7.7 13.22 95 age of intrusion 2042 1 123.09 2 biotite conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 6.93 12.71 94 age of intrusion 2043 1 219.8 4 biotite conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 26.35 94 age of intrusion 2097 1 113.86 2 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.21 12.2 46 age of intrusion BIOTITE SLIGHTLY CHLORITIZED POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 2098 1 155.65 3 glass conventional K-Ar 2A "4.72E-04, 0.584E-04, 1.19E-04*" 2.38 5.57 90 minimum age of intrusion GLASSY GROUNDMASS (MATRIX) POTASSIUM VALUE IS AVERAGE OF 3 ANALYSES 2098 2 173 2 hornblende conventional K-Ar 2B "4.72E-04, 0.584E-04, 1.19E-04*" 1.3 3.39 64 age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES OF REPLICATE ANALYSES 2099 1 201.03 4 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.59 26.3 79 age of intrusion POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 2100 1 203.43 4 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 8.87 27.5 87 age of intrusion POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 2101 1 102.44 2 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.83 13.4 92 age of intrusion POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 2102 1 98.83 2 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 8 11.7 87 age of intrusion POTASSIUM VALUE IS AVERAGE OF REPLICATE ANALYSES 2115 1 236.69 5 biotite conventional K-Ar YAG-4 "4.72E-04, 0.584E-04, 1.19E-04*" 7.36 26.8 91 age of later metamorphism 2133 1 259.43 13 whole rock conventional K-Ar R-3917 "4.72E-04, 0.584E-04, 1.19E-04*" 4.71 18.92 94 minimum age of metamorphic crystallization 2134 1 236.33 12 whole rock conventional K-Ar R-3920 "4.72E-04, 0.584E-04, 1.19E-04*" 3.4 12.36 87 minimum age of metamorphic crystallization 2135 1 270.29 13 whole rock conventional K-Ar R3818 "4.72E-04, 0.584E-04, 1.19E-04*" 4.85 20.36 98 age of metamorphic crystallization 2135 2 267.2 13 whole rock conventional K-Ar R-3818 "4.72E-04, 0.584E-04, 1.19E-04*" 4.85 20.11 98 age of metamorphic crystallization 2136 1 281.7 15 biotite conventional K-Ar B-3817 "4.72E-04, 0.584E-04, 1.19E-04*" 3.98 17.47 92 age not evaluated IMPURE CONCENTRATE 2136 2 253.2 12 biotite conventional K-Ar B-3817A "4.72E-04, 0.584E-04, 1.19E-04*" 7.75 30.33 91 age of metamorphic crystallization UPGRADED CONCENTRATE 2137 1 242.72 11 biotite conventional K-Ar B-3815 "4.72E-04, 0.584E-04, 1.19E-04*" 8.55 31.98 97 minimum age of metamorphic crystallization 2138 1 234.8 11 biotite conventional K-Ar B-3816 "4.72E-04, 0.584E-04, 1.19E-04*" 8.34 30.11 88 minimum age of intrusion 2139 1 245.7 12 biotite conventional K-Ar B-3814 "4.72E-04, 0.584E-04, 1.19E-04*" 7.6 28.8 93 minimum age of intrusion 2140 1 287.83 15 whole rock conventional K-Ar R-3821 "4.72E-04, 0.584E-04, 1.19E-04*" 4.16 18.69 95 age of later metamorphism 2141 1 248.87 13 biotite conventional K-Ar B-3012 "4.72E-04, 0.584E-04, 1.19E-04*" 7.08 27.2 100 age of later metamorphism 2142 1 253.29 13 biotite conventional K-Ar B-3013 "4.72E-04, 0.584E-04, 1.19E-04*" 8.71 34.1 96 age of later metamorphism 2143 1 180.22 8 biotite conventional K-Ar B-3126B "4.72E-04, 0.584E-04, 1.19E-04*" 8.07 22.02 94 age of intrusion 2190 1 365.69 17 biotite conventional K-Ar B-3609 "4.72E-04, 0.585E-04, 1.19E-04*" 6.66 38.87 84 age of intrusion 2190 2 377.15 17 biotite conventional K-Ar B-3609 "4.72E-04, 0.585E-04, 1.19E-04*" 6.66 40.22 94 age of intrusion 2190 3 368.58 15 biotite conventional K-Ar B-3609 "4.72E-04, 0.585E-04, 1.19E-04*" 6.66 39.21 100 age of intrusion 2191 1 358.63 10 biotite conventional K-Ar ME-10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 48.21 96 age of intrusion 2192 1 382.99 10 whole rock conventional K-Ar R-3883 "4.72E-04, 0.585E-04, 1.19E-04*" 3.43 21.07 100 age of metamorphic crystallization 2193 1 384.62 18 whole rock conventional K-Ar R-3447 "4.72E-04, 0.585E-04, 1.19E-04*" 3.2 19.75 97 age of metamorphic crystallization 2194 1 375.52 15 whole rock conventional K-Ar R-3444 "4.72E-04, 0.585E-04, 1.19E-04*" 3.94 23.68 98 age of metamorphic crystallization 2195 1 355.18 15 whole rock conventional K-Ar R-3448 "4.72E-04, 0.585E-04, 1.19E-04*" 3.1 17.52 88 minimum age of metamorphic crystallization 2196 1 362.39 15 biotite conventional K-Ar B-3593 "4.72E-04, 0.585E-04, 1.19E-04*" 4.51 26.06 97 initial age disturbed by later metamorphism 2197 1 373.06 10 biotite conventional K-Ar ME-9 "4.72E-04, 0.585E-04, 1.19E-04*" 5.38 32.1 83 initial age disturbed by later metamorphism 2197 2 372.84 10 biotite conventional K-Ar ME-9 "4.72E-04, 0.585E-04, 1.19E-04*" 4.83 28.8 68 initial age disturbed by later metamorphism 2198 1 323 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2198 2 386 hornblende conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN APPROXIMATE AGE OF A THERMAL AND METASOMATIC EVENT WHICH RESET K-AR MINERAL AGES 2199 1 359 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2199 2 380 hornblende conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN APPROXIMATE AGE OF A THERMAL AND METASOMATIC EVENT WHICH RESET K-AR MINERAL AGES 2200 1 346 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2200 2 342 hornblende conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2201 1 314 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2201 2 336 hornblende conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2202 1 342 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of uplift and cooling NO ANALYTICAL DATA GIVEN 2202 2 399 hornblende conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN APPROXIMATE AGE OF A THERMAL AND METASOMATIC EVENT WHICH RESET K-AR MINERAL AGES 2214 1 322.4 biotite conventional K-Ar YAG 14 "4.72E-04, 0.584E-04, 1.19E-04*" 6.69 34 94 initial age disturbed by later metamorphism 2215 1 345.37 biotite conventional K-Ar YAG 15 "4.72E-04, 0.584E-04, 1.19E-04*" 8.77 48.06 97 initial age disturbed by later metamorphism 2% CHLORITE 2216 1 346.06 muscovite conventional K-Ar YAG 17 "4.72E-04, 0.584E-04, 1.19E-04*" 8.23 45.2 96 minimum age of metamorphic crystallization 2221 1 352.09 whole rock conventional K-Ar B-2 "4.72E-04, 0.584E-04, 1.19E-04*" 4.05 22.67 93 initial age disturbed by later metamorphism 2223 1 231.82 whole rock conventional K-Ar B-5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.57 2.03 53 initial age disturbed by later metamorphism 2224 1 263.88 whole rock conventional K-Ar B-6 "4.72E-04, 0.584E-04, 1.19E-04*" 0.11 0.45 25 initial age disturbed by later metamorphism 2227 1 262.49 biotite conventional K-Ar B-9 "4.72E-04, 0.584E-04, 1.19E-04*" 7.37 29.98 91 initial age disturbed by later metamorphism 5% CHLORITE 2228 1 271 biotite conventional K-Ar B-10 "4.72E-04, 0.584E-04, 1.19E-04*" 8.15 34.31 91 initial age disturbed by later metamorphism 2% CHLORITE 2230 1 326.38 biotite conventional K-Ar B-12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.62 44.4 93 initial age disturbed by later metamorphism BIOTITE-MUSCOVITE MIXTURE 2231 1 328.08 muscovite conventional K-Ar B-13 "4.72E-04, 0.584E-04, 1.19E-04*" 10.38 53.77 94 initial age disturbed by later metamorphism MUSCOVITE-BIOTITE MIXTURE 2319 1 770.55 50 whole rock conventional K-Ar US-12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.112 1.55 29 age meaning uncertain (geologic factors) REPLICATE K AND AR ANALYSES AGE TOO YOUNG 2320 1 1201.56 40 whole rock conventional K-Ar 68-2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.92 47.2 98 minimum age of metamorphic crystallization REPLICATE K AND AR ANALYSES 2339 1 1466.46 50 hornblende conventional K-Ar D1268 "4.72E-04, 0.584E-04, 1.19E-04*" 0.442 14.4 97 initial age disturbed by later metamorphism 2340 1 1366.13 50 hornblende conventional K-Ar D1276 "4.72E-04, 0.584E-04, 1.19E-04*" 0.476 14 96 initial age disturbed by later metamorphism 2341 1 28.87 0.6 biotite conventional K-Ar 735 "4.72E-04, 0.584E-04, 1.19E-04*" 7.47 3.13 78 age of volcanism DUPLICATE K ANALYSES 2342 1 27.3 0.5 biotite conventional K-Ar 737 "4.72E-04, 0.584E-04, 1.19E-04*" 7.98 3.16 68 age of volcanism DUPLICATE K ANALYSES 2343 1 27.24 0.5 biotite conventional K-Ar 736 "4.72E-04, 0.584E-04, 1.19E-04*" 4.96 1.96 64 age of volcanism 6% CHLORITE DUPLICATE K ANALYSES 2344 1 50.55 1.6 chlorite group conventional K-Ar 738 "4.72E-04, 0.584E-04, 1.19E-04*" 1.13 0.834 31 minimum age of intrusion ALTERED MAFIC MATERIAL; CHLORITE + CLAY DUPLICATE K ANALYSES 2344 2 23.82 0.5 plagioclase conventional K-Ar 738R "4.72E-04, 0.584E-04, 1.19E-04*" 2.61 0.901 66 DUPLICATE K ANALYSES AGE TOO YOUNG 2345 1 26.14 0.7 whole rock conventional K-Ar 739 "4.72E-04, 0.584E-04, 1.19E-04*" 2.06 0.781 39 minimum age of volcanism DUPLICATE K ANALYSES 2346 1 15.28 0.3 whole rock conventional K-Ar 741 "4.72E-04, 0.584E-04, 1.19E-04*" 5.66 1.25 48 minimum age of volcanism DUPLICATE K ANALYSES 2347 1 183.83 4 pyroxenes conventional K-Ar 744 "4.72E-04, 0.584E-04, 1.19E-04*" 0.664 1.85 64 25% CHLORITE AND 10% WHOLE-ROCK DUPLICATE K AND AR ANALYSES AGE TOO OLD 2347 2 62.9 1.2 plagioclase conventional K-Ar 744R "4.72E-04, 0.584E-04, 1.19E-04*" 2.93 2.7 56 minimum age of intrusion WHOLE-ROCK LESS HEAVY FRACTION DUPLICATE K ANALYSES 2348 1 489.72 10 hornblende conventional K-Ar 745 "4.72E-04, 0.584E-04, 1.19E-04*" 0.958 7.76 91 5% CHLORITE AND 3% WHOLE-ROCK DUPLICATE K AND AR ANALYSES AGE TOO OLD 2348 2 85.6 1.7 plagioclase conventional K-Ar 745R "4.72E-04, 0.584E-04, 1.19E-04*" 1.87 2.36 47 WHOLE ROCK LESS HEAVY FRACTION DUPLICATE K AND AR ANALYSES AGE APPEARS TOO OLD 2349 1 87.67 augite-ferroaugite conventional K-Ar 743P "4.72E-04, 0.584E-04, 1.19E-04*" 0.576 0.745 46 5% HORNBLENDE AND 6% WHOLE-ROCK REPLICATE K AND AR ANALYSES AGE TOO OLD 2349 2 66.62 1.3 biotite conventional K-Ar 743 "4.72E-04, 0.584E-04, 1.19E-04*" 8.28 8.09 79 age of intrusion 4% CHLORITE AND 6% HORNBLENDE DUPLICATE K AND AR ANALYSES 2350 1 40.64 0.8 whole rock conventional K-Ar 730 "4.72E-04, 0.584E-04, 1.19E-04*" 2.89 1.71 13 DUPLICATE K ANALYSES AGE IS PROBABLY TOO OLD 2351 1 31.34 0.6 pyroxenes conventional K-Ar 746 "4.72E-04, 0.584E-04, 1.19E-04*" 1.54 0.701 49 age of intrusion 1% BIOTITE DUPLICATE K ANALYSES 2352 1 69.25 1.4 hornblende conventional K-Ar 748 "4.72E-04, 0.584E-04, 1.19E-04*" 1.84 1.87 69 age of intrusion 4% WHOLE-ROCK DUPLICATE K ANALYSES 2352 2 69.76 1.4 plagioclase conventional K-Ar 748R "4.72E-04, 0.584E-04, 1.19E-04*" 3.34 3.42 56 age of intrusion WHOLE ROCK LESS HEAVY FRACTION DUPLICATE K ANALYSES 2353 1 34.7 biotite conventional K-Ar 733 "4.72E-04, 0.584E-04, 1.19E-04*" 3.37 1.7 60 age of intrusion 25% CHLORITE AND 20% WHOLE-ROCK DUPLICATE K ANALYSES 2354 1 24.05 0.5 hornblende conventional K-Ar 749A "4.72E-04, 0.584E-04, 1.19E-04*" 1.42 0.495 43 age of intrusion PYROXENE+HORNBLENDE WITH 5% WHOLE-ROCK REPLICATE K ANALYSES 2355 1 27.94 1.1 chlorite group conventional K-Ar 750 "4.72E-04, 0.584E-04, 1.19E-04*" 0.634 0.257 26 minimum age of intrusion ALTERED MAFIC MATERIAL DUPLICATE K ANALYSES 2355 2 28.96 0.8 plagioclase conventional K-Ar 750R "4.72E-04, 0.584E-04, 1.19E-04*" 2.26 0.95 37 minimum age of intrusion WHOLE ROCK LESS HEAVY FRACTION DUPLICATE K ANALYSES 2356 1 44.72 0.9 hornblende conventional K-Ar 751 "4.72E-04, 0.584E-04, 1.19E-04*" 1.58 1.03 77 age of intrusion 17% WHOLE-ROCK DUPLICATE K ANALYSES 2356 2 49.52 0.9 plagioclase conventional K-Ar 751R "4.72E-04, 0.584E-04, 1.19E-04*" 2.02 1.46 54 age of intrusion WHOLE ROCK LESS HEAVY FRACTION REPLICATE K AND AR ANALYSES 2357 1 12.58 0.3 sanidine conventional K-Ar USGS(M)8I-142 "4.72E-04, 0.585E-04, 1.19E-04*" 6.16 1.12 92 minimum age of volcanism 2358 1 15.1 0.4 sanidine conventional K-Ar USGS(M)6I-122 "4.72E-04, 0.585E-04, 1.19E-04" 6.52 72 age of volcanism 2359 1 18.69 0.5 biotite conventional K-Ar USGS(M)8I-143 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 2.37 73 minimum age of volcanism 2360 1 20.81 0.5 biotite conventional K-Ar USGS(M)6I-124 "4.72E-04, 0.585E-04, 1.19E-04*" 8.63 2.6 78 age of volcanism 2361 1 20.06 0.5 sanidine conventional K-Ar USGS(M)6I-123 "4.72E-04, 0.585E-04, 1.19E-04*" 10.81 3.14 91 age of volcanism 2362 1 20.35 0.5 biotite conventional K-Ar USGS(M)8I-150 "4.72E-04, 0.585E-04, 1.19E-04*" 6.04 1.78 44 age of volcanism 2363 1 26.13 0.6 sanidine conventional K-Ar USGS(M)6I-125 "4.72E-04, 0.585E-04, 1.19E-04*" 4.75 1.8 82 age of volcanism 2364 1 145.58 3 biotite conventional K-Ar YU-ACME 30 "4.72E-04, 0.584E-04, 1.19E-04*" 6.4 13.97 93 minimum age of volcanism DUPLICATE K ANALYSES 2365 1 163.78 3 hornblende conventional K-Ar YU-379 "4.72E-04, 0.584E-04, 1.19E-04*" 0.474 1.17 61 age of intrusion 30% BINARY HORNBLENDE-PYROXENE GRAINS DUPLICATE K AND AR ANALYSES 2365 2 149.23 3 biotite conventional K-Ar YU-379 "4.72E-04, 0.584E-04, 1.19E-04*" 7.38 16.53 90 age meaning uncertain (geologic factors) DUPLICATE K AND AR ANALYSES 2366 1 118.01 3 plagioclase conventional K-Ar YU-SW312 "4.72E-04, 0.584E-04, 1.19E-04*" 0.516 0.906 37 age meaning uncertain (geologic factors) DUPLICATE K ANALYSES 2367 1 142.3 2 biotite conventional K-Ar YU-ROCK HILL SYENITE "4.72E-04, 0.584E-04, 1.19E-04*" 6.38 13.6 94 age of intrusion REPLICATE K AND AR ANALYSES MINIMUM AGE FOR THRUST EMPLACEMENT OF KLIPPE 2368 1 75.41 1 whole rock conventional K-Ar YU-ROCK HILL BASALT "4.72E-04, 0.584E-04, 1.19E-04*" 6.72 7.45 84 age meaning uncertain (geologic factors) REPLICATE K AND AR ANALYSES 2369 1 8.82 0.17 K feldspar conventional K-Ar YU-1A-AY "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 1.13 74 age of volcanism DUPLICATE K ANALYSES 2370 1 8.43 0.16 K feldspar conventional K-Ar YU-1-AY "4.72E-04, 0.584E-04, 1.19E-04*" 9.04 1.1 66 age of volcanism DUPLICATE K ANALYSES 2371 1 13.47 0.3 K feldspar conventional K-Ar YU-3-AY "4.72E-04, 0.584E-04, 1.19E-04*" 8.22 1.6 47 age of volcanism DUPLICATE K ANALYSES 2372 1 20.34 4 K feldspar conventional K-Ar YU-2-AY "4.72E-04, 0.584E-04, 1.19E-04*" 4.21 1.24 5 age meaning uncertain (analysis questionable) DUPLICATE ANALYSES 2373 1 16.67 2 whole rock conventional K-Ar YU-4-AY "4.72E-04, 0.584E-04, 1.19E-04*" 1.265 0.305 8 age of volcanism DUPLICATE ANALYSES 2374 1 27.03 0.4 biotite conventional K-Ar YU-NR-LH "4.72E-04, 0.584E-04, 1.19E-04*" 5.51 2.16 61 age of volcanism DUPLICATE ANALYSES GEOLOGY DISCUSSED BY BEST AND OTHERS (1973) 2375 1 34.73 0.5 biotite conventional K-Ar YU-CP-LH "4.72E-04, 0.584E-04, 1.19E-04*" 7.19 3.63 59 age of volcanism DUPLICATE ANALYSES 2375 2 39.96 1 plagioclase conventional K-Ar YU-CP-LH "4.72E-04, 0.584E-04, 1.19E-04*" 0.6 0.349 23 age not evaluated REPLICATE ANALYSES 2376 1 9.9 0.3 whole rock conventional K-Ar YU-179-PW "4.72E-04, 0.584E-04, 1.19E-04*" 0.796 0.114 18 age of volcanism DUPLICATE ANALYSES 2377 1 2.23 0.3 whole rock conventional K-Ar YU-MP-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.41 0.0132 6 age of volcanism DUPLICATE K ANALYSES "MINIMUM AGE FOR ORTIZ SURFACE, MESA PRIETA" 2378 1 2.57 0.2 whole rock conventional K-Ar YU-JCD-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.811 0.03 11 age of volcanism DUPLICATE K ANALYSES MINIMUM AGE FOR ORTIZ SURFACE 2379 1 43.39 1 whole rock conventional K-Ar YU-YAG222 "4.72E-04, 0.584E-04, 1.19E-04*" 4.16 2.63 52 minimum age of volcanism DUPLICATE K ANALYSES 2380 1 67.34 2 biotite conventional K-Ar YU-YAG 788 "4.72E-04, 0.584E-04, 1.19E-04*" 8.18 8.08 78 minimum age of intrusion DUPLICATE K ANALYSES 2381 1 1390.4 40 biotite conventional K-Ar YU-31 "4.72E-04, 0.584E-04, 1.19E-04*" 8.64 260.6 96 age of intrusion DUPLICATE K ANALYSES ARMSTRONG (1964) REPORTED A K-AR AGE OF 1375 M.Y. FOR THIS BIOTITE 2382 1 26.69 0.8 muscovite conventional K-Ar YU-237 "4.72E-04, 0.584E-04, 1.19E-04*" 4.21 1.63 61 age not evaluated PLUS QUARTZ DUPLICATE K ANALYSES 2383 1 236.73 6 hornblende conventional K-Ar YU-192A "4.72E-04, 0.584E-04, 1.19E-04*" 0.229 0.834 48 MINOR QUARTZ AND CHLORITE REPLICATE K ANALYSES AGE APPEARS TOO OLD 2384 1 37.28 1.1 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 9.09 4.93 76 age of intrusion 2385 1 39.5 1.1 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.68 4.99 80 age of intrusion 2386 1 37.85 1.1 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 8.97 4.94 80 age of intrusion 2387 1 38 1.1 biotite conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.44 2.41 89 age of intrusion (*) 2388 1 31.46 0.9 biotite conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.34 3.81 67 age of volcanism 2389 1 31.95 0.9 biotite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 8.06 3.74 58 age of volcanism 2390 1 32.4 0.9 biotite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.69 4.09 79 age of intrusion 2391 1 25.47 0.8 biotite conventional K-Ar LSH-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.96 2.57 73 minimum age of intrusion 2391 2 26.05 0.8 biotite conventional K-Ar LSH-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.96 2.629 87 minimum age of intrusion 2392 1 31.87 0.9 hornblende conventional K-Ar 63-MC-64 "4.72E-04, 0.585E-04, 1.19E-04*" 0.961 0.4448 62 age of intrusion 2393 1 29.11 1.4 biotite conventional K-Ar 63 MC 63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.01 3.807 54 age of intrusion 2394 1 26.13 0.8 muscovite conventional K-Ar 64 MC 20 "4.72E-04, 0.585E-04, 1.19E-04*" 10.24 3.88 78 minimum age of intrusion 2396 1 32.92 1 biotite conventional K-Ar 64 MC 5 "4.72E-04, 0.585E-04, 1.19E-04*" 9.15 4.376 47 age of intrusion 2396 2 34.34 1 hornblende conventional K-Ar 64MC5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.531 0.265 53 age of intrusion 2397 1 33.43 1 biotite conventional K-Ar 58 FC 53 "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 4.149 70 age of intrusion 2397 2 31.92 1.5 hornblende conventional K-Ar 58 FC 53 "4.72E-04, 0.585E-04, 1.19E-04*" 0.55 0.255 27 age of intrusion 2398 1 33.24 1 biotite conventional K-Ar 64 MC 4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.59 4.149 88 age of intrusion 2398 2 36.02 1.1 hornblende conventional K-Ar 64 MC 4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.487 0.2551 47 age of intrusion 2399 1 37.5 1.5 biotite conventional K-Ar LSH-3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.13 4.435 90 age of intrusion 2400 1 37.66 1.1 biotite conventional K-Ar LSH-4A "4.72E-04, 0.585E-04, 1.19E-04*" 5.01 2.745 73 age of intrusion 2401 1 35.92 1.1 biotite conventional K-Ar 63 MC 47 "4.72E-04, 0.585E-04, 1.19E-04*" 7.81 4.079 85 age of volcanism 2402 1 33.43 1 biotite conventional K-Ar 62 MC 12 "4.72E-04, 0.585E-04, 1.19E-04*" 7.92 3.847 86 age of volcanism 2403 1 34.86 1 biotite conventional K-Ar 62MC15 "4.72E-04, 0.585E-04, 1.19E-04*" 7.48 3.791 77 age of volcanism 2404 1 38.32 1.1 biotite conventional K-Ar 63MC66 "4.72E-04, 0.585E-04, 1.19E-04*" 5.85 3.262 89 age of volcanism 2405 1 36.72 0.23 biotite conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 10.08 5.384 74 HYDROTHERMAL; BRONZE-COLORED DUPLICATE ANALYSES AGE OF MINERALIZATION 2406 1 36.6 0.3 biotite conventional K-Ar 20B "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 4.695 73 HYDROTHERMAL; BRONZE-COLORED DUPLICATE K2O ANALYSES AGE OF MINERALIZATION 2407 1 169.9 8 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 4.77 12.235 minimum age of volcanism 3% CLAY 2408 1 166.16 8 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 21.5 minimum age of volcanism 5% IMPURITIES 2409 1 154.61 8 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 7.96 18.5 15% CLAY AGE TOO YOUNG 2411 1 157.82 8 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 7.37 17.5 5% IMPURITIES AGE TOO YOUNG 2412 1 142.04 7 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 5.17 11 20% IMPURITIES AGE TOO YOUNG 2440 1 2528.01 125 whole rock conventional K-Ar KA-147 "4.76E-04, 0.589E-04, 1.18E-04*" 2.73 217 age of metamorphic crystallization 2441 1 2522.04 125 sericite conventional K-Ar KA-97 "4.76E-04, 0.589E-04, 1.18E-04*" 6.04 478 age of metamorphic crystallization "SAMPLE SHOWS QUARTZ, SERICITE, AND CHLORITE (X-RAY)" 2442 1 1588.1 80 sericite conventional K-Ar KA-18 "4.76E-04, 0.589E-04, 1.18E-04*" 9.41 345 age meaning uncertain (geologic factors) DUPLICATE ARGON ANALYSES THIS AGE MAY DATE LATER FAULTING AND MINERALIZATION 2443 1 2621.66 130 whole rock conventional K-Ar KA-200 "4.76E-04, 0.589E-04, 1.18E-04*" 2.82 240 age of metamorphic crystallization 2444 1 2460.33 125 whole rock conventional K-Ar KA-228 "4.76E-04, 0.589E-04, 1.18E-04*" 0.91 68.8 age of metamorphic crystallization 2445 1 2170.44 110 whole rock conventional K-Ar KA-244 "4.76E-04, 0.589E-04, 1.18E-04*" 2.28 138 age meaning uncertain (geologic factors) 2446 1 1945.53 85 whole rock conventional K-Ar KA-243 "4.76E-04, 0.589E-04, 1.18E-04*" 2.58 130 age meaning uncertain (geologic factors) 2447 1 780.05 40 whole rock conventional K-Ar KA-242 "4.76E-04, 0.589E-04, 1.18E-04*" 2.42 34 age meaning uncertain (geologic factors) 2448 1 1925.22 95 whole rock conventional K-Ar KA-240 "4.76E-04, 0.589E-04, 1.18E-04*" 2.14 106 age meaning uncertain (geologic factors) DUPLICATE ARGON ANALYSES 2449 1 1179.08 60 biotite conventional K-Ar KA-106B "4.76E-04, 0.589E-04, 1.18E-04*" 8.39 201 initial age disturbed by later metamorphism 2449 2 1567.99 K feldspar conventional K-Ar KA-106F "4.76E-04, 0.589E-04, 1.18E-04*" 8.98 323 NO AGE CALCULATED 2450 1 1672.7 85 biotite conventional K-Ar KA-323 "4.76E-04, 0.589E-04, 1.18E-04*" 7.89 313 initial age disturbed by later metamorphism 2451 1 2334.79 115 biotite conventional K-Ar KA-229 "4.76E-04, 0.589E-04, 1.18E-04*" 2.37 163 initial age disturbed by later metamorphism 2452 1 2424.1 120 sericite conventional K-Ar KA-328S "4.76E-04, 0.589E-04, 1.18E-04*" 5.3 390 Hanson and others (1971) age of intrusion 2453 1 2607.62 130 biotite conventional K-Ar KA-47 "4.76E-04, 0.589E-04, 1.18E-04*" 4.57 385 age of intrusion 2454 1 2584.28 130 biotite conventional K-Ar KA-46 "4.76E-04, 0.589E-04, 1.18E-04*" 3.96 328 age of intrusion DUPLICATE ARGON ANALYSES 2455 1 2556.66 130 biotite conventional K-Ar KA-239 "4.76E-04, 0.589E-04, 1.18E-04*" 9.19 746 Peterman and others (1972) age of intrusion 2456 1 2480.42 125 biotite conventional K-Ar KA-249 "4.76E-04, 0.589E-04, 1.18E-04*" 9.33 716 Peterman and others (1972) age of metamorphic crystallization 2457 1 2494.01 125 biotite conventional K-Ar KA-250 "4.76E-04, 0.589E-04, 1.18E-04*" 8.14 631 age of metamorphic crystallization 2458 1 2494.62 125 biotite conventional K-Ar KA-94 "4.76E-04, 0.589E-04, 1.18E-04*" 7.93 615 age of intrusion REPLICATE ARGON ANALYSES 2459 1 2384.26 120 biotite conventional K-Ar KA-4 "4.76E-04, 0.589E-04, 1.18E-04*" 7.73 552 age of intrusion REPLICATE ARGON ANALYSES 2459 2 2113.73 K feldspar KA-4 "4.76E-04, 0.589E-04, 1.18E-04*" 12.74 737 "NO AGE CALCULATED, REPLICATE ARGON ANALYSES" 2460 1 2487.76 125 biotite conventional K-Ar KA-83 "4.76E-04, 0.589E-04, 1.18E-04*" 6.48 500 age of metamorphic crystallization 2461 1 2387.95 120 biotite conventional K-Ar KA-82B "4.76E-04, 0.589E-04, 1.18E-04*" 7.89 565 minimum age of metamorphic crystallization 2461 2 1833.19 K feldspar KA-82 "4.76E-04, 0.589E-04, 1.18E-04*" 13.5 618 NO AGE CALCULATED 2462 1 2379.18 120 biotite conventional K-Ar KA-307 "4.76E-04, 0.589E-04, 1.18E-04*" 8.8 626 Peterman and others (1972) initial age disturbed by later metamorphism 2463 1 2470.3 125 muscovite conventional K-Ar KA-17 "4.76E-04, 0.589E-04, 1.18E-04*" 10.28 783 Peterman and others (1972) age of intrusion 2464 1 2472.81 125 biotite conventional K-Ar KA-88 "4.76E-04, 0.589E-04, 1.18E-04*" 8.4 641 Peterman and others (1972) age of intrusion 2465 1 2495.52 125 biotite conventional K-Ar KA-236 "4.76E-04, 0.589E-04, 1.18E-04*" 6.43 499 Peterman and others (1972) age of intrusion DUPLICATE ARGON ANALYSES 2466 1 2529.58 125 biotite conventional K-Ar KA-237 "4.76E-04, 0.589E-04, 1.18E-04*" 4.75 378 Peterman and others (1972) age of metamorphic crystallization DUPLICATE K2O ANALYSES 2467 1 2330.89 115 biotite conventional K-Ar KA-48 "4.76E-04, 0.589E-04, 1.18E-04*" 3.5 240 Peterman and others (1972) DUPLICATE ARGON ANALYSES AGE APPEARS TOO YOUNG 2468 1 2620.35 130 biotite conventional K-Ar KA-105 "4.76E-04, 0.589E-04, 1.18E-04*" 5.81 494 age of intrusion DUPLICATE ARGON ANALYSES 2469 1 2600.82 130 biotite conventional K-Ar KA-317 "4.76E-04, 0.589E-04, 1.18E-04*" 8.72 731 Peterman and others (1972) age of metamorphic crystallization 2470 1 2541.75 130 biotite conventional K-Ar KA-316 "4.76E-04, 0.589E-04, 1.18E-04*" 8.17 656 Peterman and others (1972) age of metamorphic crystallization 2471 1 2280 115 biotite conventional K-Ar KA-81 "4.76E-04, 0.589E-04, 1.18E-04*" 2.76 182 age not evaluated 2471 2 1855.17 K feldspar KA-81 "4.76E-04, 0.589E-04, 1.18E-04*" 7.18 335 NO AGE CALCULATED 2472 1 1144.33 55 biotite conventional K-Ar KA-8 "4.76E-04, 0.589E-04, 1.18E-04*" 4.26 98 initial age disturbed by later metamorphism DUPLICATE ARGON ANALYSES 2472 2 1463.09 K feldspar KA-8F "4.76E-04, 0.589E-04, 1.18E-04*" 5.02 163 NO AGE CALCULATED 2473 1 1477.14 75 whole rock conventional K-Ar KA-137 "4.76E-04, 0.589E-04, 1.18E-04*" 4.1 135 Peterman (1966) minimum age of metamorphic crystallization 2474 1 1193.18 60 whole rock conventional K-Ar KA-212 "4.76E-04, 0.589E-04, 1.18E-04*" 4.07 99.1 Peterman (1966) age not evaluated 2475 1 1101.24 55 biotite conventional K-Ar KA-295 "4.76E-04, 0.589E-04, 1.18E-04*" 7.14 156 age of intrusion 2476 1 1008.04 50 biotite conventional K-Ar KA-92 "4.76E-04, 0.589E-04, 1.18E-04*" 7.51 146 age of intrusion 2477 1 1209.79 60 biotite conventional K-Ar KA-176 "4.76E-04, 0.589E-04, 1.18E-04*" 6.73 167 age of intrusion 2478 1 1063.41 55 biotite conventional K-Ar KA-65 "4.76E-04, 0.589E-04, 1.18E-04*" 7.24 151 age of intrusion 2480 1 1224.62 60 whole rock conventional K-Ar KA-232 "4.76E-04, 0.589E-04, 1.18E-04*" 4.28 108 Peterman (1966) initial age disturbed by later metamorphism 2481 1 1183.5 60 whole rock conventional K-Ar KA-233 "4.76E-04, 0.589E-04, 1.18E-04*" 4.02 96.8 Peterman (1966) initial age disturbed by later metamorphism 2482 1 1071.37 55 whole rock conventional K-Ar KA-131 "4.76E-04, 0.589E-04, 1.18E-04*" 4.89 103 Peterman (1966) age of metamorphic crystallization 2483 1 1043.6 50 biotite conventional K-Ar KA-177 "4.76E-04, 0.589E-04, 1.18E-04*" 8.7 177 age of metamorphic crystallization 2484 1 770 45 whole rock conventional K-Ar KA-101 "4.76E-04, 0.589E-04, 1.18E-04*" 5.4 74.3 DUPLICATE ARGON ANALYSES AGE SEEMS TOO YOUNG 2485 1 1030 60 whole rock conventional K-Ar KA-102 "4.76E-04, 0.589E-04, 1.18E-04*" 4.34 86.3 age of intrusion 2486 1 1037.44 50 whole rock conventional K-Ar KA-103 "4.76E-04, 0.589E-04, 1.18E-04*" 3.21 64.8 age of intrusion 2487 1 868.71 45 whole rock conventional K-Ar KA-104 "4.76E-04, 0.589E-04, 1.18E-04*" 3.05 49 AGE SEEMS TOO YOUNG 2488 1 1632.59 80 whole rock conventional K-Ar KA-35 "4.76E-04, 0.589E-04, 1.18E-04*" 3.61 138 Peterman (1966) age of metamorphic crystallization -20+40 MESH DUPLICATE ARGON ANALYSES 2489 1 1639.34 80 whole rock conventional K-Ar KA-38 "4.76E-04, 0.589E-04, 1.18E-04*" 1.24 47.7 Peterman (1966) age of metamorphic crystallization -20+40 MESH DUPLICATE ARGON ANALYSES 2490 1 1652.89 80 muscovite conventional K-Ar KA-39 "4.76E-04, 0.589E-04, 1.18E-04*" 5.16 201 Peterman (1966) age of metamorphic crystallization DUPLICATE ARGON ANALYSES 2491 1 1612.04 80 muscovite conventional K-Ar KA-40 "4.76E-04, 0.589E-04, 1.18E-04*" 4.56 171 Peterman (1966) age of metamorphic crystallization 2492 1 1589.87 80 whole rock conventional K-Ar KA-96 "4.76E-04, 0.589E-04, 1.18E-04*" 2.29 84.1 Peterman (1966) age of metamorphic crystallization 2493 1 1677.93 85 biotite conventional K-Ar KA-41 "4.76E-04, 0.589E-04, 1.18E-04*" 8.63 344 age of metamorphic crystallization DUPLICATE ARGON ANALYSES 2494 1 1655.57 85 biotite conventional K-Ar KA-43 "4.76E-04, 0.589E-04, 1.18E-04*" 7.58 296 age of metamorphic crystallization DUPLICATE ARGON ANALYSES 2495 1 1718.61 85 biotite conventional K-Ar KA-164 "4.76E-04, 0.589E-04, 1.18E-04*" 8.22 340 age of metamorphic crystallization DUPLICATE ARGON ANALYSES 2496 1 1505.44 75 biotite conventional K-Ar KA-63 "4.76E-04, 0.589E-04, 1.18E-04*" 8.89 301 minimum age of metamorphic crystallization DUPLICATE ARGON ANALYSES 2497 1 1554.19 80 whole rock conventional K-Ar KA-132 "4.76E-04, 0.589E-04, 1.18E-04*" 4.93 175 Peterman (1966) age of metamorphic crystallization DUPLICATE ARGON ANALYSES 2498 1 1673.82 85 whole rock conventional K-Ar KA-33 "4.76E-04, 0.589E-04, 1.18E-04*" 5.54 220 Peterman (1966) age of metamorphic crystallization 2499 1 1583.42 80 whole rock conventional K-Ar KA-134 "4.76E-04, 0.589E-04, 1.18E-04*" 4.63 169 Peterman (1966) age of metamorphic crystallization 2500 1 1674.97 85 whole rock conventional K-Ar KA-215 "4.76E-04, 0.589E-04, 1.18E-04*" 4.05 161 Peterman (1966) age of metamorphic crystallization 2501 1 1783.34 90 biotite conventional K-Ar KA-10 "4.76E-04, 0.589E-04, 1.18E-04*" 6.07 266 age of intrusion REPLICATE ARGON ANALYSES 2501 2 1307.57 K feldspar KA-10F "4.76E-04, 0.589E-04, 1.18E-04*" 12.77 353 NO AGE CALCULATED 2502 1 1764.5 90 biotite conventional K-Ar KA-1 "4.76E-04, 0.589E-04, 1.18E-04*" 8.33 359 age of intrusion DUPLICATE ARGON ANALYSES 2503 1 1738.9 85 biotite conventional K-Ar KA-61 "4.76E-04, 0.589E-04, 1.18E-04*" 8.38 353 age of intrusion 2503 2 1471.24 K feldspar KA-61F "4.76E-04, 0.589E-04, 1.18E-04*" 12.25 401 "REPLICATE ARGON ANALYSES, NO AGE CALCULATED" 2504 1 1776.46 90 biotite conventional K-Ar KA-64 "4.76E-04, 0.589E-04, 1.18E-04*" 7.76 338 age of intrusion 2505 1 1710.98 85 biotite conventional K-Ar KA-60 "4.76E-04, 0.589E-04, 1.18E-04*" 7.79 320 initial age disturbed by later metamorphism 2506 1 1592.66 80 biotite conventional K-Ar KA-59 "4.76E-04, 0.589E-04, 1.18E-04*" 7.74 285 initial age disturbed by later metamorphism 2507 1 1687.71 85 biotite conventional K-Ar KA-62 "4.76E-04, 0.589E-04, 1.18E-04*" 7.31 294 age of intrusion DUPLICATE ARGON ANALYSES 2508 1 1643.46 80 biotite conventional K-Ar KA-6 "4.76E-04, 0.589E-04, 1.18E-04*" 7.51 290 age of intrusion REPLICATE ARGON ANALYSES 2508 2 1155.51 K feldspar KA-6 "4.76E-04, 0.589E-04, 1.18E-04*" 10.94 255 NO AGE CALCULATED 2509 1 1647.33 80 biotite conventional K-Ar KA-58 "4.76E-04, 0.589E-04, 1.18E-04*" 6.58 255 age of intrusion 2510 1 2530.52 125 biotite conventional K-Ar KA-14-1 "4.76E-04, 0.589E-04, 1.18E-04*" 8.2 653 Goldich and others (1970) age of later metamorphism REPLICATE ARGON ANALYSES 2510 2 2048.44 K feldspar KA-14-F "4.76E-04, 0.589E-04, 1.18E-04*" 9.24 507 "DUPLICATE ARGON ANALYSES, NO AGE CALCULATED" 2510 3 2521.91 125 biotite conventional K-Ar KA-14-2 "4.76E-04, 0.589E-04, 1.18E-04*" 8.29 656 Goldich and others (1970) age of later metamorphism UPGRADED BIOTITE FROM KA-14-1 2511 1 2438.57 125 biotite conventional K-Ar KA-15-1 "4.76E-04, 0.589E-04, 1.18E-04*" 6.52 485 Goldich and others (1970) age of later metamorphism 2511 2 2148.2 K feldspar KA-15-F "4.76E-04, 0.589E-04, 1.18E-04*" 7.87 468 "DUPLICATE ARGON ANALYSES, NO AGE CALCULATED" 2511 3 2541.81 130 biotite conventional K-Ar KA-15-2 "4.76E-04, 0.589E-04, 1.18E-04*" 7.41 595 Goldich and others (1970) age of later metamorphism UPGRADED BIOTITE FROM KA-15-1 2512 1 2561.73 130 biotite conventional K-Ar KA-107 "4.76E-04, 0.589E-04, 1.18E-04*" 7.99 651 Goldich and others (1970) age of later metamorphism 2513 1 2500.13 125 biotite conventional K-Ar KA-186 "4.76E-04, 0.589E-04, 1.18E-04*" 8.45 658 Goldich and others (1970) age of later metamorphism 2514 1 2458.21 125 biotite conventional K-Ar KA-171 "4.76E-04, 0.589E-04, 1.18E-04*" 7.22 545 Goldich and others (1970) age of later metamorphism 2515 1 2467.83 125 biotite conventional K-Ar KA-208 "4.76E-04, 0.589E-04, 1.18E-04*" 5.84 444 Goldich and others (1970) age of later metamorphism DUPLICATE ARGON ANALYSES 2516 1 1752.54 90 biotite conventional K-Ar KA-195 "4.76E-04, 0.589E-04, 1.18E-04*" 4.62 197 age of intrusion 2517 1 2397.11 120 biotite conventional K-Ar KA-210 "4.76E-04, 0.589E-04, 1.18E-04*" 8.64 623 age of later metamorphism DUPLICATE ARGON ANALYSES 2518 1 2290.82 115 biotite conventional K-Ar KA-52 "4.76E-04, 0.589E-04, 1.18E-04*" 3.88 258 age of intrusion 2519 1 2482.53 125 biotite conventional K-Ar KA-51 "4.76E-04, 0.589E-04, 1.18E-04*" 7.52 578 Goldich and others (1970) age of later metamorphism 2519 2 1999.56 K feldspar KA-51 "4.76E-04, 0.589E-04, 1.18E-04*" 12.92 681 NO AGE CALCULATED 2520 1 2408.75 120 biotite conventional K-Ar KA-9 "4.76E-04, 0.589E-04, 1.18E-04*" 6.53 475 Goldich and others (1970) minimum age of intrusion 2520 2 1649.43 K feldspar KA-9F "4.76E-04, 0.589E-04, 1.18E-04*" 8.37 325 NO AGE CALCULATED 2521 1 2428.42 120 biotite conventional K-Ar KA-13 "4.76E-04, 0.589E-04, 1.18E-04*" 6.8 502 Goldich and others (1970) minimum age of intrusion DUPLICATE ARGON ANALYSES 2522 1 2455.12 125 biotite conventional K-Ar KA-23 "4.76E-04, 0.589E-04, 1.18E-04*" 4.82 363 Goldich and others (1970) minimum age of intrusion 2523 1 2301.06 115 biotite conventional K-Ar KA-24 "4.76E-04, 0.589E-04, 1.18E-04*" 7.52 504 Goldich and others (1970) initial age disturbed by later metamorphism REPLICATE ARGON ANALYSES 2523 2 1731.72 K feldspar KA-24F "4.76E-04, 0.589E-04, 1.18E-04*" 13.38 560 NO AGE CALCULATED 2524 1 1842.3 90 biotite conventional K-Ar KA-27-1 "4.76E-04, 0.589E-04, 1.18E-04*" 5.96 275 Goldich and others (1970) age of later metamorphism DUPLICATE ARGON ANALYSES 2524 2 1367.22 K feldspar KA-27F "4.76E-04, 0.589E-04, 1.18E-04*" 10.46 308 DUPLICATE ARGON ANALYSES; NO AGE CALCULATED 2524 3 1853.05 95 biotite conventional K-Ar KA-27-2 "4.76E-04, 0.589E-04, 1.18E-04*" 7.73 360 Goldich and others (1970) age of later metamorphism UPGRADED BIOTITE OF KA-27-1 2525 1 1750.91 90 biotite conventional K-Ar KA-54-1 "4.76E-04, 0.589E-04, 1.18E-04*" 6.67 284 Goldich and others (1970) age of later metamorphism DUPLICATE ARGON ANALYSES 2525 2 1635.32 K feldspar KA-54F "4.76E-04, 0.589E-04, 1.18E-04*" 12.89 494 REPLICATE ARGON ANALYSES; NO AGE CALCULATED 2525 3 1756.44 90 biotite conventional K-Ar KA-54-2 "4.76E-04, 0.589E-04, 1.18E-04*" 6.31 270 Goldich and others (1970) age of later metamorphism UPGRADED BIOTITE OF KA-54-1 2526 1 1840.37 90 biotite conventional K-Ar KA-25 "4.76E-04, 0.589E-04, 1.18E-04*" 5.97 275 Goldich and others (1970) age of later metamorphism DUPLICATE ARGON ANALYSES 2527 1 1719.3 85 biotite conventional K-Ar KA-209 "4.76E-04, 0.589E-04, 1.18E-04*" 7.78 322 Goldich and others (1970) initial age disturbed by later metamorphism DUPLICATE ARGON ANALYSES 2528 1 1790.53 90 biotite conventional K-Ar KA-22 "4.76E-04, 0.589E-04, 1.18E-04*" 7.12 314 Goldich and others (1970) age of later metamorphism DUPLICATE ARGON ANALYSES 2529 1 1693.65 85 biotite conventional K-Ar KA-28 "4.76E-04, 0.589E-04, 1.18E-04*" 7.32 296 Goldich and others (1970) minimum age of intrusion DUPLICATE ARGON ANALYSES 2530 1 1701.36 85 biotite conventional K-Ar KA-29 "4.76E-04, 0.589E-04, 1.18E-04*" 7.76 316 Goldich and others (1970) age of intrusion DUPLICATE ARGON ANALYSES 2531 1 1674.63 85 biotite conventional K-Ar KA-55 "4.76E-04, 0.589E-04, 1.18E-04*" 8.48 337 Goldich and others (1970) initial age disturbed by later metamorphism DUPLICATE ARGON ANALYSES 2531 2 1450.79 K feldspar KA-55 "4.76E-04, 0.589E-04, 1.18E-04*" 14.28 458 NO AGE CALCULATED 2532 1 1678.74 85 biotite conventional K-Ar KA-56 "4.76E-04, 0.589E-04, 1.18E-04*" 9.15 365 Goldich and others (1970) initial age disturbed by later metamorphism 2533 1 1679.79 85 biotite conventional K-Ar KA-108 "4.76E-04, 0.589E-04, 1.18E-04*" 8.44 337 Goldich and others (1970) initial age disturbed by later metamorphism DUPLICATE ARGON ANALYSES 2534 1 1803.23 90 biotite conventional K-Ar KA-109 "4.76E-04, 0.589E-04, 1.18E-04*" 8.79 392 Goldich and others (1970) initial age disturbed by later metamorphism DUPLICATE ARGON ANALYSES 2535 1 2179.79 110 biotite conventional K-Ar KA-44 "4.76E-04, 0.589E-04, 1.18E-04*" 5.33 325 Goldich and others (1970) initial age disturbed by later metamorphism 2536 1 1207.79 60 whole rock conventional K-Ar KA-50 "4.76E-04, 0.589E-04, 1.18E-04*" 5.17 128 minimum age of volcanism DUPLICATE ARGON ANALYSES 2547 1 1551.29 80 whole rock conventional K-Ar 408 (90-100) "4.72E-04, 0.585E-04, 1.19E-04*" 5.65 200 minimum age of metamorphic crystallization K DETERMINED BY XRF 2551 1 1584.35 80 whole rock conventional K-Ar 410 (100-110) "4.72E-04, 0.585E-04, 1.19E-04*" 3.75 137 minimum age of metamorphic crystallization K DETERMINED BY XRF 2553 1 1479.67 75 whole rock conventional K-Ar 411 (80-100) "4.72E-04, 0.585E-04, 1.19E-04*" 5.15 170 age not evaluated K DETERMINED BY XRF 2567 1 1200 biotite conventional K-Ar KA-8 "4.72E-04, 0.577E-04" 4.22 Goldich and others (1961) initial age disturbed by later metamorphism WITH CONSIDERABLE CHLORITE 2567 2 1540 K feldspar conventional K-Ar KA-8 "4.72E-04, 0.577E-04" 4.98 Goldich and others (1961) initial age disturbed by later metamorphism 2568 1 4.97 0.15 whole rock conventional K-Ar A8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.996 0.0713 47 age of volcanism "0.996%, 0.996% K2O" 2569 1 5.01 0.15 whole rock conventional K-Ar A11 "4.72E-04, 0.585E-04, 1.19E-04*" 1.035 0.0748 52 age of volcanism "1.03%, 1.04% K2O" 2570 1 19.97 muscovite conventional K-Ar YAG 96 "4.72E-04, 0.585E-04, 1.19E-04*" 9.72 2.81 72 Michard-Vitrac and others (1977) DUPLICATE K ANALYSES; AR DETERMINED BY NAA AGE REDETERMINED; SEE REFERENCE 2570 2 21.88 muscovite conventional K-Ar YAG 96 "4.72E-04, 0.585E-04, 1.19E-04*" 9.72 3.08 61 Michard-Vitrac and others (1977) AR DETERMINED BY NAA; DUPLICATE K ANALYSES AGE REDETERMINED; SEE REFERENCE 2571 1 21.36 muscovite conventional K-Ar YAG 97 "4.72E-04, 0.585E-04, 1.19E-04*" 4.17 1.29 25 Michard-Vitrac and others (1977) MUSCOVITE-CHLORITE MIXTURE DUPLICATE K ANAYLSES; AR DETERMINED BY NAA "AGE REDETERMINED, SEE REFERENCE" 2572 1 4.96 0.14 whole rock conventional K-Ar A12 "4.72E-04, 0.585E-04, 1.19E-04*" 1.04 0.0743 50 age of volcanism "1.04%, 1.04% K2O" 2573 1 5.2 0.15 whole rock conventional K-Ar A15 "4.72E-04, 0.585E-04, 1.19E-04*" 1.705 0.1278 61 age of volcanism "1.70%, 1.71% K2O" 2574 1 41.51 biotite conventional K-Ar YAG-142B "4.72E-04, 0.585E-04, 1.19E-04*" 9.38 5.67 78 Michard-Vitrac and others (1977) DUPLICATE K ANALYSES; AR DETERMINED BY NAA AGE REDETERMINED; SEE REFERENCE 2574 2 38.25 biotite conventional K-Ar YAG-142B "4.72E-04, 0.585E-04, 1.19E-04*" 9.38 5.22 78 Marvin and others (1977) AR DETERMINED BY NAA; DUPLICATE K ANALYSES AGE REDETERMINED; SEE REFERENCE 2575 1 58.17 biotite conventional K-Ar YAG-143 "4.72E-04, 0.585E-04, 1.19E-04*" 5.17 4.4 66 Michard-Vitrac and others (1977) 22% CHLORITE DUPLICATE K ANALYSES; AR DETERMINED BY NAA AGE REDETERMINED; SEE REFERENCE 2576 1 5 0.15 whole rock conventional K-Ar A17 "4.72E-04, 0.585E-04, 1.19E-04*" 1.375 0.0992 53 age of volcanism "1.37%, 1.38% K2O" 2577 1 431.29 whole rock conventional K-Ar -219 "4.72E-04, 0.585E-04, 1.19E-04*" 2.78 19.5 Armstrong (1970) DUPLICATE K ANALYSES; AR DETERMINED BY NEUTRON ACTIVATION "AGE REDETERMINED, SEE REFERENCE, SAMPLE 219" 2578 1 360.1 whole rock conventional K-Ar -220 "4.72E-04, 0.585E-04, 1.19E-04*" 2.48 14.23 Armstrong (1970) DUPLICATE K ANALYSES; AR DETERMINED BY NEUTRON ACTIVATION "AGE REDETERMINED, SEE REFERENCE, SAMPLE 220" 2578 2 323.01 whole rock conventional K-Ar -220 "4.72E-04, 0.585E-04, 1.19E-04*" 2.48 12.63 Michard-Vitrac and others (1977) DUPLICATE K ANALYSES; AR DETERMINED BY NEUTRON ACTIVATION "AGE REDETERMINED, SEE REFERENCE, SAMPLE 220" 2579 1 92.65 5 biotite conventional K-Ar 57NC89 "4.72E-04, 0.585E-04, 1.19E-04*" 9.03 12.36 95 age of intrusion 2580 1 155.99 8 biotite conventional K-Ar 59NC57 "4.72E-04, 0.585E-04, 1.19E-04*" 7.84 18.39 96 age of intrusion 2581 1 152.06 8 biotite conventional K-Ar 59NC59 "4.72E-04, 0.585E-04, 1.19E-04*" 9.29 21.22 95 age of intrusion 2582 1 83.1 4 biotite conventional K-Ar 60NC175 "4.72E-04, 0.585E-04, 1.19E-04*" 8.56 10.48 71 age of intrusion 2583 1 35.07 2 biotite conventional K-Ar 62NC142 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 4.303 80 age of intrusion 2584 1 75.32 2 biotite conventional K-Ar 63NC20 "4.72E-04, 0.585E-04, 1.19E-04*" 9.04 10.01 73 age of intrusion 2585 1 90.87 4 biotite conventional K-Ar 63NC40 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 11.11 92 age of intrusion 2586 1 39.19 2 biotite conventional K-Ar 63NC86 "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 4.729 84 age of intrusion 2587 1 31.93 2 biotite conventional K-Ar 63NC106 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 3.803 82 age of intrusion 2588 1 1780.06 55 pyroxenes conventional K-Ar 88 "4.72E-04, 0.584E-04, 1.19E-04*" 0.138 6.03 90 "sample contains excess radiogenic argon, age is too old" 2589 1 352.87 10 hornblende conventional K-Ar 154 "4.72E-04, 0.584E-04, 1.19E-04*" 1.44 8.08 98 age of intrusion 2590 1 547.79 16 hornblende conventional K-Ar 140 "4.72E-04, 0.584E-04, 1.19E-04*" 0.675 6.22 93 age not evaluated 2591 1 424.1 13 hornblende conventional K-Ar 141 "4.72E-04, 0.584E-04, 1.19E-04*" 0.77 5.3 86 age not evaluated 2592 1 578.23 17 hornblende conventional K-Ar 145 "4.72E-04, 0.584E-04, 1.19E-04*" 1.18 11.58 96 age not evaluated 2599 1 272.52 8 biotite conventional K-Ar M-1 "4.72E-04, 0.584E-04, 1.19E-04*" 4.59 19.44 94 age of intrusion SOMEWHAT IMPURE K20 DETERMINED BY ISOTOPE DILUTION 2600 1 98.66 2 phlogopite conventional K-Ar AK-1 "4.72E-04, 0.584E-04, 1.19E-04*" 5.74 8.38 89 age of intrusion SOME IMPURITIES 2601 1 108.3 3 phlogopite conventional K-Ar AK-8 "4.72E-04, 0.584E-04, 1.19E-04*" 9.82 15.78 95 age of volcanism 2602 1 12.82 0.3 sanidine conventional K-Ar 203F "4.72E-04, 0.584E-04, 1.19E-04*" 7.29 1.35 70 age of volcanism REPLICATE ANALYSES 2603 1 13.25 0.6 sanidine conventional K-Ar 765 "4.72E-04, 0.584E-04, 1.19E-04*" 6.79 1.3 55 age of volcanism REPLICATE ANALYSES 2604 1 13.64 0.5 sanidine conventional K-Ar 45 "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 1.48 38 age of volcanism DUPLICATE ANALYSES 2605 1 18 0.6 biotite conventional K-Ar 44B "4.72E-04, 0.584E-04, 1.19E-04*" 4.76 1.24 41 age of volcanism BIOTITE-HORNBLENDE MIXTURE WITH 4% WHOLE-ROCK REPLICATE ANALYSES 2605 2 18.01 1 plagioclase conventional K-Ar 44F "4.72E-04, 0.584E-04, 1.19E-04*" 1.42 0.37 14 age of volcanism REPLICATE K ANALYSES 2606 1 18.45 0.4 biotite conventional K-Ar 36B "4.72E-04, 0.584E-04, 1.19E-04*" 5.88 1.57 56 age of volcanism PLUS 35% HORNBLENDE AND WHOLE-ROCK REPLICATE K ANALYSES 2607 1 20.27 0.4 biotite conventional K-Ar 41 "4.72E-04, 0.584E-04, 1.19E-04*" 6.78 1.99 53 age of volcanism "8% HORNBLENDE, 3% PYROXENE" REPLICATE ANALYSES 2608 1 22.11 0.4 biotite conventional K-Ar 46 "4.72E-04, 0.584E-04, 1.19E-04*" 7.68 2.46 66 age of volcanism 5% HORNBLENDE DUPLICATE ANALYSES 2609 1 21.02 0.4 biotite conventional K-Ar 35B "4.72E-04, 0.584E-04, 1.19E-04*" 5.75 1.75 57 age of volcanism 25% HORNBLENDE AND WHOLE-ROCK REPLICATE ANALYSES 2609 2 21.58 1 plagioclase conventional K-Ar 35F "4.72E-04, 0.584E-04, 1.19E-04*" 0.8 0.25 24 age of volcanism REPLICATE ANALYSES 2610 1 21.91 0.4 biotite conventional K-Ar 32 "4.72E-04, 0.584E-04, 1.19E-04*" 3.75 1.19 50 age of volcanism "30% HORNBLENDE, 6% PYROXENE" REPLICATE ANALYSES 2611 1 24.67 0.5 biotite conventional K-Ar 70 "4.72E-04, 0.584E-04, 1.19E-04*" 4.81 1.72 51 age of volcanism "35% HORNBLENDE, 2% GLASS" REPLICATE ANALYSES 2612 1 21.85 0.5 biotite conventional K-Ar 73 "4.72E-04, 0.584E-04, 1.19E-04*" 8.28 2.62 43 age of volcanism DUPLICATE K ANALYSES 2613 1 22.27 0.4 sanidine conventional K-Ar 828 "4.72E-04, 0.584E-04, 1.19E-04*" 9.64 3.11 84 age of volcanism REPLICATE ANALYSES 2614 1 24.01 0.5 biotite conventional K-Ar 764B "4.72E-04, 0.584E-04, 1.19E-04*" 8.22 2.86 50 age of volcanism DUPLICATE K ANALYSES 2614 2 23.27 1.7 plagioclase conventional K-Ar 764F "4.72E-04, 0.584E-04, 1.19E-04*" 0.86 0.29 23 age of volcanism REPLICATE K ANALYSES 2615 1 23.92 0.5 biotite conventional K-Ar 47B "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 2.69 69 age of volcanism 4% HORNBLENDE AND WHOLE-ROCK DUPLICATE K ANALYSES 2615 2 25.25 0.7 plagioclase conventional K-Ar 47F "4.72E-04, 0.584E-04, 1.19E-04*" 1.12 0.41 41 age of volcanism REPLICATE ANALYSES 2615 3 21.9 0.4 glass conventional K-Ar 47G "4.72E-04, 0.584E-04, 1.19E-04*" 4.35 1.38 57 minimum age of volcanism REPLICATE ANALYSES 2616 1 24.05 0.5 biotite conventional K-Ar 42 "4.72E-04, 0.584E-04, 1.19E-04*" 7.46 2.6 67 age of volcanism "2% CHLORITE, 2% HORNBLENDE" DUPLICATE K ANALYSES 2617 1 24.66 0.5 biotite conventional K-Ar 48B "4.72E-04, 0.584E-04, 1.19E-04*" 6.91 2.47 50 age of volcanism DUPLICATE ANALYSES 2617 2 22.88 0.5 sanidine conventional K-Ar 48F "4.72E-04, 0.584E-04, 1.19E-04*" 9.32 3.09 80 age of volcanism REPLICATE ANALYSES 2618 1 26.85 1 plagioclase conventional K-Ar 827 "4.72E-04, 0.584E-04, 1.19E-04*" 0.95 0.37 31 age of volcanism DUPLICATE ANALYSES 2619 1 24.7 0.8 biotite conventional K-Ar 43 "4.72E-04, 0.584E-04, 1.19E-04*" 7.01 2.51 34 age of volcanism REPLICATE ANALYSES 2620 1 26.65 0.5 biotite conventional K-Ar 167 "4.72E-04, 0.584E-04, 1.19E-04*" 5.77 2.23 54 age of volcanism 20% HORNBLENDE DUPLICATE K ANALYSES 2621 1 27.93 0.6 biotite conventional K-Ar 165 "4.72E-04, 0.584E-04, 1.19E-04*" 6.54 2.65 60 age of volcanism 15% HORNBLENDE REPLICATE K ANALYSES 2622 1 25.71 0.5 whole rock conventional K-Ar 160 "4.72E-04, 0.584E-04, 1.19E-04*" 5.74 2.14 86 minimum age of volcanism DUPLICATE K ANALYSES 2623 1 25.08 0.5 whole rock conventional K-Ar 170 "4.72E-04, 0.584E-04, 1.19E-04*" 3.3 1.2 47 minimum age of volcanism DUPLICATE K ANALYSES 2624 1 30.31 0.6 biotite conventional K-Ar 158 "4.72E-04, 0.584E-04, 1.19E-04*" 6.59 2.9 67 age of volcanism 22% HORNBLENDE REPLICATE ANALYSES 2625 1 31.63 0.6 biotite conventional K-Ar 101E "4.72E-04, 0.584E-04, 1.19E-04*" 7.77 3.57 73 age of volcanism REPLICATE ANALYSES 2626 1 29.83 0.6 biotite conventional K-Ar 63 "4.72E-04, 0.584E-04, 1.19E-04*" 7.39 3.2 75 age of volcanism DUPLICATE ANALYSES 2627 1 29.67 0.6 biotite conventional K-Ar 103C "4.72E-04, 0.584E-04, 1.19E-04*" 8.01 3.45 61 age of volcanism DUPLICATE ANALYSES 2628 1 29.93 0.6 biotite conventional K-Ar 159B "4.72E-04, 0.584E-04, 1.19E-04*" 8.77 3.81 69 age of volcanism REPLICATE ANALYSES 2628 2 28.35 0.6 glass conventional K-Ar 159-G "4.72E-04, 0.584E-04, 1.19E-04*" 3.89 1.6 53 minimum age of volcanism REPLICATE ANALYSES 2629 1 31.53 0.6 biotite conventional K-Ar 102C "4.72E-04, 0.584E-04, 1.19E-04*" 3.45 1.58 54 age of volcanism 45% HORNBLENDE REPLICATE ANALYSES 2630 1 30.41 0.6 biotite conventional K-Ar 170B "4.72E-04, 0.584E-04, 1.19E-04*" 8.72 3.85 77 age of volcanism DUPLICATE ANALYSES 2631 1 27.34 0.8 plagioclase conventional K-Ar 831 "4.72E-04, 0.584E-04, 1.19E-04*" 0.58 0.23 29 minimum age of volcanism REPLICATE ANALYSES 2632 1 29.28 0.6 biotite conventional K-Ar 834AB "4.72E-04, 0.584E-04, 1.19E-04*" 7.53 3.2 55 age of volcanism DUPLICATE K ANALYSES 2632 2 31.56 0.9 hornblende conventional K-Ar 834AH "4.72E-04, 0.584E-04, 1.19E-04*" 0.96 0.44 40 age of volcanism 8% BIOTITE REPLICATE ANALYSES 2633 1 27.99 0.6 biotite conventional K-Ar 834B "4.72E-04, 0.584E-04, 1.19E-04*" 7.88 3.2 55 age of volcanism DUPLICATE ANALYSES 2634 1 26.85 0.5 biotite conventional K-Ar 81 "4.72E-04, 0.584E-04, 1.19E-04*" 8.96 3.49 73 REPLICATE ANALYSES AGE LOWERED 2635 1 29.27 0.8 hornblende - biotite conventional K-Ar 183B "4.72E-04, 0.584E-04, 1.19E-04*" 2.66 1.13 35 age of volcanism HORNBLENDE-BIOTITE MIXTURE WITH 40% WHOLE-ROCK REPLICATE K ANALYSES 2636 1 31.3 0.6 sanidine conventional K-Ar 826 "4.72E-04, 0.584E-04, 1.19E-04*" 11.22 5.1 82 age of volcanism REPLICATE ANALYSES 2637 1 31.11 0.6 biotite conventional K-Ar 77 "4.72E-04, 0.584E-04, 1.19E-04*" 8.41 3.8 47 age of volcanism 5% GLASS DUPLICATE ANALYSES 2638 1 33.32 0.7 sanidine conventional K-Ar 829 "4.72E-04, 0.584E-04, 1.19E-04*" 12.35 5.98 85 age of volcanism REPLICATE ANALYSES 2639 1 33.05 0.7 biotite conventional K-Ar 76 "4.72E-04, 0.584E-04, 1.19E-04*" 7.56 3.63 59 age of volcanism 3% CHLORITE REPLICATE ANALYSES 2640 1 35.02 0.7 biotite conventional K-Ar 79 "4.72E-04, 0.584E-04, 1.19E-04*" 8.72 4.44 59 age of volcanism REPLICATE K ANALYSES 2641 1 34.36 0.7 biotite conventional K-Ar 150 "4.72E-04, 0.584E-04, 1.19E-04*" 7.87 3.93 72 age of volcanism 5% WHOLE-ROCK DUPLICATE ANALYSES 2642 1 8.81 0.2 sanidine conventional K-Ar 139 "4.72E-04, 0.584E-04, 1.19E-04*" 8.34 1.06 44 age of volcanism REPLICATE ANALYSES 2643 1 11.9 0.4 sanidine conventional K-Ar 90 "4.72E-04, 0.584E-04, 1.19E-04*" 8.03 1.38 54 age of volcanism DUPLICATE ANALYSES 2644 1 39.82 0.9 biotite conventional K-Ar 207 "4.72E-04, 0.584E-04, 1.19E-04*" 5.21 3.02 44 age of volcanism "2% CHLORITE, 20% WHOLE-ROCK" REPLICATE K ANALYSES 2645 1 6.24 0.2 sanidine conventional K-Ar 177 "4.72E-04, 0.584E-04, 1.19E-04*" 7.45 0.67 47 age of volcanism 30% WHOLE-ROCK REPLICATE ANALYSES 2646 1 3.49 0.2 sanidine conventional K-Ar 173 "4.72E-04, 0.584E-04, 1.19E-04*" 9.34 0.47 34 age of volcanism DUPLICATE ANALYSES 2647 1 34.56 0.7 biotite conventional K-Ar 172B "4.72E-04, 0.584E-04, 1.19E-04*" 8.4 4.22 47 age of volcanism REPLICATE K ANALYSES 2648 1 37.03 0.7 biotite conventional K-Ar 171 "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 4.18 53 age of volcanism DUPLICATE ANALYSES 2649 1 15.31 1 whole rock conventional K-Ar 112 "4.72E-04, 0.584E-04, 1.19E-04*" 4.79 1.06 12 age of volcanism DUPLICATE ANALYSES 2650 1 37.01 0.7 biotite conventional K-Ar 111 "4.72E-04, 0.584E-04, 1.19E-04*" 8.47 4.56 50 age of volcanism DUPLICATE K ANALYSES 2651 1 31.34 0.6 biotite conventional K-Ar 117 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 3.8 51 age of volcanism 7% CHLORITE DUPLICATE K ANALYSES 2652 1 14.89 0.5 whole rock conventional K-Ar 120 "4.72E-04, 0.584E-04, 1.19E-04*" 3.14 0.676 30 age of volcanism DUPLICATE ANALYSES 2653 1 31.71 0.6 whole rock conventional K-Ar 121 "4.72E-04, 0.584E-04, 1.19E-04*" 4.19 1.93 61 age of intrusion REPLICATE ANALYSES 2654 1 31.69 0.7 whole rock conventional K-Ar 122 "4.72E-04, 0.584E-04, 1.19E-04*" 4.28 1.97 39 age of volcanism DUPLICATE K ANALYSES 2655 1 32.87 1 whole rock conventional K-Ar 128 "4.72E-04, 0.584E-04, 1.19E-04*" 11.16 5.33 59 age of volcanism REPLICATE ANALYSES 2656 1 9.52 0.4 glass conventional K-Ar 129 "4.72E-04, 0.584E-04, 1.19E-04*" 5.78 0.794 28 minimum age of volcanism REPLICATE ANALYSES 2657 1 37.33 0.7 biotite conventional K-Ar 208 "4.72E-04, 0.584E-04, 1.19E-04*" 7.44 4.04 55 age of volcanism "8% HORNBLENDE, 7% CHLORITE" DUPLICATE K ANALYSES 2658 1 36.01 0.7 biotite conventional K-Ar 191F "4.72E-04, 0.584E-04, 1.19E-04*" 6.76 3.54 44 age of volcanism "20% HORNBLENDE, 3% CHLORITE" DUPLICATE K ANALYSES 2659 1 32.67 0.7 biotite conventional K-Ar 194 "4.72E-04, 0.584E-04, 1.19E-04*" 6.91 3.28 43 age of volcanism 15% HORNBLENDE REPLICATE K ANALYSES 2660 1 33.86 0.7 whole rock conventional K-Ar 201 "4.72E-04, 0.584E-04, 1.19E-04*" 5.73 2.82 67 age of volcanism REPLICATE K ANALYSES 2661 1 35.68 0.7 biotite conventional K-Ar 149 "4.72E-04, 0.584E-04, 1.19E-04*" 8.5 4.41 61 age of volcanism DUPLICATE K ANALYSES 2662 1 36.54 0.7 biotite conventional K-Ar 105 "4.72E-04, 0.584E-04, 1.19E-04*" 7.79 4.14 60 age of intrusion DUPLICATE K ANALYSES 2663 1 36.69 0.7 biotite conventional K-Ar 104 "4.72E-04, 0.584E-04, 1.19E-04*" 7.57 4.04 53 age of volcanism 3% CLAY REPLICATE K ANALYSES 2664 1 23.5 1 biotite conventional K-Ar 56 "4.72E-04, 0.584E-04, 1.19E-04*" 7.34 2.5 33 age of volcanism 2% CHLORITE REPLICATE K ANALYSES 2665 1 34.87 0.9 biotite conventional K-Ar 55 "4.72E-04, 0.584E-04, 1.19E-04*" 8.64 4.38 75 age of volcanism REPLICATE ANALYSES 2666 1 24.37 0.5 biotite conventional K-Ar 766 "4.72E-04, 0.584E-04, 1.19E-04*" 7.7 2.72 60 age of volcanism 4% HORNBLENDE 2667 1 34.09 0.8 biotite conventional K-Ar 60 "4.72E-04, 0.584E-04, 1.19E-04*" 7.73 3.83 43 age of volcanism DUPLICATE K ANALYSES 2668 1 27.09 0.5 biotite conventional K-Ar 72 "4.72E-04, 0.584E-04, 1.19E-04*" 8.22 3.23 58 age of volcanism DUPLICATE K ANALYSES 2669 1 19.04 0.5 biotite conventional K-Ar 50B "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 2.07 46 age of volcanism DUPLICATE K ANALYSES 2669 2 18.48 1 plagioclase conventional K-Ar 50F "4.72E-04, 0.584E-04, 1.19E-04*" 0.972 0.26 19 age of volcanism DUPLICATE K ANALYSES 2669 3 16.97 2 pyroxenes conventional K-Ar 50PX "4.72E-04, 0.584E-04, 1.19E-04*" 0.33 0.081 8 minimum age of volcanism 20% WHOLE-ROCK DUPLICATE K ANALYSES 2670 1 14.87 0.3 biotite conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04*" 6 1.29 46 age of volcanism REPLICATE K ANALYSES 2671 1 34.82 0.7 whole rock conventional K-Ar 54 "4.72E-04, 0.584E-04, 1.19E-04*" 3.26 1.65 80 age of volcanism DUPLICATE K ANALYSES 2672 1 8.81 0.3 whole rock conventional K-Ar 203I "4.72E-04, 0.584E-04, 1.19E-04*" 1.73 0.22 30 age of volcanism REPLICATE K ANALYSES 2673 1 20.68 0.5 whole rock conventional K-Ar 71Z "4.72E-04, 0.584E-04, 1.19E-04*" 3.22 0.964 41 age of volcanism DUPLICATE K ANALYSES 2674 1 35.89 0.7 whole rock conventional K-Ar 106 "4.72E-04, 0.584E-04, 1.19E-04*" 2.05 1.07 65 age of volcanism DUPLICATE K ANALYSES 2675 1 15.03 1 whole rock conventional K-Ar 123 "4.72E-04, 0.584E-04, 1.19E-04*" 1.45 0.315 16 age of volcanism DUPLICATE K ANALYSES 2676 1 14.85 1.5 whole rock conventional K-Ar 125 "4.72E-04, 0.584E-04, 1.19E-04*" 1.56 0.335 99 age of volcanism DUPLICATE K ANALYSES; *AR VALUE IS QUESTIONABLE--COMPILER) 2677 1 6.04 1 whole rock conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04*" 0.85 0.074 5 age of volcanism REPLICATE ANALYSES 2678 1 4.5 0.3 amphiboles - hornblende conventional K-Ar 28 "4.72E-04, 0.584E-04, 1.19E-04*" 1.85 0.12 28 age of intrusion DUPLICATE ANALYSES 2679 1 12.09 1 whole rock conventional K-Ar 33 "4.72E-04, 0.584E-04, 1.19E-04*" 6.3 1.1 12 age of intrusion REPLICATE K ANALYSES 2680 1 11.4 0.3 whole rock conventional K-Ar 977 "4.72E-04, 0.584E-04, 1.19E-04*" 2.55 0.42 47 age of volcanism DUPLICATE K ANALYSES 2681 1 36.98 1.4 whole rock conventional K-Ar 110 "4.72E-04, 0.584E-04, 1.19E-04*" 3.96 2.13 25 age of intrusion REPLICATE K ANALYSES 2682 1 33.18 0.6 biotite conventional K-Ar 137 "4.72E-04, 0.584E-04, 1.19E-04*" 8.67 4.18 64 age of intrusion DUPLICATE K ANALYSES 2683 1 32.97 0.6 whole rock conventional K-Ar 118 "4.72E-04, 0.584E-04, 1.19E-04*" 4.28 2.05 48 age of intrusion REPLICATE K ANALYSES 2684 1 23.97 0.6 biotite conventional K-Ar 98B "4.72E-04, 0.584E-04, 1.19E-04*" 8.32 2.89 29 age not evaluated DUPLICATE ANALYSES 2684 2 49.42 1 muscovite conventional K-Ar 98M "4.72E-04, 0.584E-04, 1.19E-04*" 8.79 6.34 35 age not evaluated "10% BIOTITE, 10% QUARTZ+FELDSPAR" DUPLICATE K ANALYSES 2685 1 46.55 4 pyroxenes conventional K-Ar 154A "4.72E-04, 0.584E-04, 1.19E-04*" 0.109 0.074 12 age not evaluated DUPLICATE ANALYSES 2686 1 23.3 0.5 biotite conventional K-Ar 74B "4.72E-04, 0.584E-04, 1.19E-04*" 7.85 2.65 53 age of intrusion 3% CHLORITE DUPLICATE K ANALYSES 2686 2 25.32 0.5 muscovite conventional K-Ar 74M "4.72E-04, 0.584E-04, 1.19E-04*" 8.69 3.19 63 age of intrusion DUPLICATE K ANALYSES 2687 1 32.99 0.6 biotite conventional K-Ar 100 "4.72E-04, 0.584E-04, 1.19E-04*" 8.49 4.07 63 age of intrusion DUPLICATE K ANALYSES 2688 1 28.48 0.9 hornblende conventional K-Ar 67 "4.72E-04, 0.584E-04, 1.19E-04*" 1.96 0.81 32 age of intrusion "20% BIOTITE, 18% CHLORITE, 3% WHOLE-ROCK" DUPLICATE K ANALYSES 2689 1 12.76 0.5 biotite conventional K-Ar 30 "4.72E-04, 0.584E-04, 1.19E-04*" 5.37 0.99 35 age of intrusion 35% CHLORITE DUPLICATE K ANALYSES 2690 1 12.92 0.5 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 6.16 1.15 31 age of intrusion 16% CHLORITE DUPLICATE K ANALYSES 2691 1 14.11 0.6 biotite conventional K-Ar 19A "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 1.75 33 age of intrusion DUPLICATE K ANALYSES 2692 1 14.82 1 orthoclase conventional K-Ar 19BF "4.72E-04, 0.584E-04, 1.19E-04*" 8.26 1.77 15 age of intrusion REPLICATE ANALYSES 2692 2 15.41 0.6 biotite conventional K-Ar 19BB "4.72E-04, 0.584E-04, 1.19E-04*" 5.43 1.21 24 age of intrusion 2693 1 17.41 0.3 whole rock conventional K-Ar 19C "4.72E-04, 0.584E-04, 1.19E-04*" 3.89 0.98 55 age of intrusion DUPLICATE K ANALYSES 2694 1 13.05 0.3 whole rock conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 5.04 0.95 59 age of intrusion DUPLICATE K ANALYSES 2695 1 16.27 0.3 biotite conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04*" 9.22 2.17 35 age of intrusion DUPLICATE K ANALYSES 2696 1 12.79 0.3 biotite conventional K-Ar 752 "4.72E-04, 0.584E-04, 1.19E-04*" 8.28 1.53 39 age of intrusion REPLICATE K ANALYSES 2697 1 6.44 0.4 whole rock conventional K-Ar 753 "4.72E-04, 0.584E-04, 1.19E-04*" 8.07 0.75 15 age of intrusion DUPLICATE K ANALYSES 2698 1 7.79 0.3 biotite conventional K-Ar 754 "4.72E-04, 0.584E-04, 1.19E-04*" 7.03 0.79 25 age of intrusion 10% HORNBLENDE DUPLICATE K ANALYSES 2699 1 23.95 0.5 biotite conventional K-Ar 140 "4.72E-04, 0.584E-04, 1.19E-04*" 7.75 2.69 71 age of intrusion DUPLICATE K ANALYSES 2700 1 37.84 0.8 biotite conventional K-Ar 206B "4.72E-04, 0.584E-04, 1.19E-04*" 6.83 3.76 55 age of intrusion 15% HORNBLENDE 2700 2 42.9 0.8 hornblende+biotite+(uralitized)pyroxene mixture conventional K-Ar 206H "4.72E-04, 0.584E-04, 1.19E-04*" 1.92 1.2 51 HORNBLENDE+BIOTITE+(URALITIZED)PYROXENE MIXTURE REPLICATE ANALYSES 2701 1 44.2 0.8 biotite - hornblende conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 2.45 1.56 62 age of intrusion BIOTITE-HORNBLENDE MIXTURE WITH 6% CHLORITE DUPLICATE ANALYSES 2702 1 29.3 0.6 biotite conventional K-Ar 176B "4.72E-04, 0.584E-04, 1.19E-04*" 4.42 1.88 59 age of intrusion "15% CHLORITE, 5% WHOLE-ROCK" REPLICATE K ANALYSES 2702 2 27.18 0.5 orthoclase conventional K-Ar 176F "4.72E-04, 0.584E-04, 1.19E-04*" 10.35 4.08 66 minimum age of intrusion DUPLICATE K ANALYSES 2703 1 9.49 0.3 biotite conventional K-Ar 147 "4.72E-04, 0.584E-04, 1.19E-04*" 7.08 0.97 34 age of intrusion "8% WHOLE-ROCK, 5% CHLORITE" DUPLICATE ANALYSES 2704 1 30.62 0.6 biotite conventional K-Ar 148 "4.72E-04, 0.584E-04, 1.19E-04*" 7.13 3.17 63 age of intrusion "4% HORNBLENDE, 2% CHLORITE" REPLICATE K ANALYSES 2705 1 21.46 0.4 biotite conventional K-Ar 162 "4.72E-04, 0.584E-04, 1.19E-04*" 7.69 2.39 58 age of intrusion DUPLICATE ANALYSES 2706 1 21.55 0.4 biotite conventional K-Ar 163 "4.72E-04, 0.584E-04, 1.19E-04*" 7.4 2.31 57 age of intrusion 6% HORNBLENDE DUPLICATE ANALYSES 2707 1 22.55 0.7 augite-ferroaugite conventional K-Ar 164 "4.72E-04, 0.584E-04, 1.19E-04*" 1.01 0.33 34 age of intrusion "30% HORNBLENDE, 5% WHOLE-ROCK" DUPLICATE ANALYSES 2708 1 39.82 1.2 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.4 4.29 90 age of intrusion 35-60 MESH DUPLICATE K2O ANALYSES 2709 1 39.47 1.3 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.92 4.55 83 age of intrusion 35-60 MESH DUPLICATE K2O ANALYSES 2710 1 41.26 1.3 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 5.3 77 age of intrusion 35-60 MESH DUPLICATE K20 ANALYSES 2711 1 38.87 1 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 9.22 5.216 77 age of intrusion 20-60 MESH DUPLICATE K20 ANALYSES 2712 1 38.65 1.2 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 4.922 83 age of intrusion 35-80 MESH DUPLICATE K20 ANALYSES 2713 1 38.62 1.2 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.53 4.794 85 age of intrusion 35-60 MESH DUPLICATE K20 ANALYSES 2714 1 38.45 1.2 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.93 4.997 74 age of intrusion 35-80 MESH DUPLICATE K20 ANALYSES 2715 1 38.25 1.2 phlogopite conventional K-Ar 11A "4.72E-04, 0.585E-04, 1.19E-04*" 9.18 5.109 82 age of intrusion 20-60 MESH DUPLICATE K20 ANALYSES 2715 2 38.19 1.2 biotite conventional K-Ar 11B "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 4.807 73 age of intrusion 35-80 MESH DUPLICATE K20 ANALYSES 2716 1 37.85 1 biotite conventional K-Ar 12A "4.72E-04, 0.585E-04, 1.19E-04*" 8.1 4.46 64 age of intrusion 35-60 MESH 2716 2 35.91 0.9 hornblende conventional K-Ar 12B "4.72E-04, 0.585E-04, 1.19E-04*" 1.07 0.5587 54 age of intrusion 35-80 MESH DUPLICATE K20 ANALYSES 2717 1 34.97 1 biotite conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 4.459 73 age of volcanism 35-80 MESH 2718 1 32.84 0.9 biotite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 7.25 3.459 57 age of volcanism 35-60 MESH 2719 1 39.22 1.4 biotite conventional K-Ar 19A "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 4.96 74 age of intrusion 35-60 MESH DUPLICATE K20 ANALYSES 2719 2 39.08 1.4 biotite conventional K-Ar 19B "4.72E-04, 0.585E-04, 1.19E-04*" 7.93 4.51 74 age of intrusion 80-120 MESH DUPLICATE K20 ANALYSES 2720 1 39.02 1.3 biotite conventional K-Ar 20A "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 5.02 79 age of intrusion 35-60 MESH DUPLICATE K20 ANALYSES 2720 2 37.8 1.3 biotite conventional K-Ar 20B "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 4.63 80 age of intrusion 80-120 MESH DUPLICATE K20 ANALYSES 2721 1 38.65 1 biotite conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 4.916 80 age of intrusion 35-80 MESH 2722 1 36.78 1.6 biotite conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 9.08 4.857 36 age of intrusion 35-80 MESH 2723 1 38.17 1.4 biotite conventional K-Ar 23A "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 4.71 92 age of intrusion 80-120 MESH 2723 2 37.83 1.4 biotite conventional K-Ar 23B "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 4.81 68 age of intrusion 35-60 MESH DUPLICATE K20 ANALYSES 2724 1 37.48 1.2 biotite conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 8.725 4.757 85 age of intrusion DUPLICATE K20 ANALYSES 2725 1 36.87 1.5 biotite conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 10.05 5.39 60 age of intrusion 35-80 MESH DUPLICATE K20 ANALYSES 2757 1 36.22 0.7 biotite conventional K-Ar 109 "4.72E-04, 0.584E-04, 1.19E-04*" 8.43 4.44 64 age of intrusion DUPLICATE ANALYSES 2758 1 32.4 0.6 biotite conventional K-Ar 138 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 3.93 61 age of intrusion DUPLICATE K ANALYSES 2759 1 36.37 0.7 biotite conventional K-Ar 93 "4.72E-04, 0.584E-04, 1.19E-04*" 6.22 3.29 62 age of intrusion "3% CHLORITE, 10% HORNBLENDE" DUPLICATE K ANALYSES 2760 1 32.92 0.6 biotite conventional K-Ar 82 "4.72E-04, 0.584E-04, 1.19E-04*" 7.59 3.63 67 age of intrusion DUPLICATE K ANALYSES 2761 1 37.09 0.7 biotite conventional K-Ar 52 "4.72E-04, 0.584E-04, 1.19E-04*" 7.84 4.23 66 age of intrusion 3% CHLORITE 2762 1 34.45 0.7 biotite conventional K-Ar 37 "4.72E-04, 0.584E-04, 1.19E-04*" 7.45 3.73 70 minimum age of intrusion 7% CHLORITE AND MONTMORILLONITE DUPLICATE K ANALYSES INITIAL AGE MAY BE MESOZOIC 2763 1 33.3 0.6 biotite conventional K-Ar 155 "4.72E-04, 0.584E-04, 1.19E-04*" 7.11 3.44 64 age of intrusion 6% CHLORITE AND MONTMORILLONITE REPLICATE K ANALYSES 2764 1 13.54 0.5 biotite conventional K-Ar 29 "4.72E-04, 0.584E-04, 1.19E-04*" 7.97 1.56 39 age of intrusion 1% CHLORITE DUPLICATE K ANALYSES 2765 1 14.15 0.6 biotite conventional K-Ar 23 "4.72E-04, 0.584E-04, 1.19E-04*" 2.9 0.593 25 age of intrusion BIOTITE-HORNBLENDE CONCENTRATE WITH 10% QUARTZ AND FELDSPAR REPLICATE K ANALYSES 2766 1 16.05 0.3 biotite conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 7.41 1.72 45 age of intrusion 2% CHLORITE REPLICATE K ANALYSES 2767 1 33.54 0.7 biotite conventional K-Ar 145 "4.72E-04, 0.584E-04, 1.19E-04*" 4.35 2.12 42 Armstrong (1970); Armstrong (1966) age of intrusion BIOTITE-HORNBLENDE MIXTURE WITH 10% WHOLE-ROCK DUPLICATE ANALYSES 2768 1 19.29 0.4 biotite conventional K-Ar 94 "4.72E-04, 0.584E-04, 1.19E-04*" 8.2 2.29 45 Armstrong (1970); Armstrong (1966) age of intrusion 2% CHLORITE REPLICATE K ANALYSES 2769 1 17.38 0.3 biotite conventional K-Ar 175 "4.72E-04, 0.584E-04, 1.19E-04*" 8.87 2.23 58 Armstrong (1970); Armstrong (1966) age of intrusion 1% MONTMORILLONITE DUPLICATE K ANALYSES 2770 1 21.96 0.6 biotite conventional K-Ar 161 "4.72E-04, 0.584E-04, 1.19E-04*" 5.47 1.74 32 Armstrong (1970); Armstrong (1966) age of intrusion 5% HORNBLENDE REPLICATE ANALYSES 2771 1 26.8 0.5 biotite conventional K-Ar 146 "4.72E-04, 0.584E-04, 1.19E-04*" 7.1 2.76 55 Armstrong (1970); Armstrong (1966) age of intrusion "4% CHLORITE, 5% HORNBLENDE" DUPLICATE K ANALYSES 2772 1 33.62 0.7 biotite conventional K-Ar 154 "4.72E-04, 0.584E-04, 1.19E-04*" 6.14 3 61 age of intrusion "8% CHLORITE, 15% HORNBLENDE" DUPLICATE K ANALYSES 2773 1 0.57 0.04 sanidine conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.19E-04*" 9.2 0.076 16 Armstrong (1966) age of volcanism REPLICATE ANALYSES 2774 1 92.33 2 biotite conventional K-Ar 53 "4.72E-04, 0.584E-04, 1.19E-04*" 3.93 5.36 65 age of intrusion "30% CHLORITE, 10% QUARTZ, FELDSPAR, AND HORNBLENDE" REPLICATE K ANALYSES 2775 1 162.19 3 biotite conventional K-Ar 91 "4.72E-04, 0.584E-04, 1.19E-04*" 5.55 13.56 87 age of intrusion "9% CHLORITE, 10% HORNBLENDE" DUPLICATE K ANALYSES 2776 1 155.39 3 muscovite conventional K-Ar 107 "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 18.13 90 age of intrusion "10% BIOTITE, CHLORITE, QUARTZ, AND FELDSPAR" REPLICATE K ANALYSES 2777 1 103.28 2 biotite conventional K-Ar 108 "4.72E-04, 0.584E-04, 1.19E-04*" 5.6 8.57 84 age of intrusion 20% CHLORITE AND MONTMORILLONITE REPLICATE ANALYSES 2778 1 153.82 3 biotite conventional K-Ar 115 "4.72E-04, 0.584E-04, 1.19E-04*" 6.64 15.35 88 age of intrusion 15% CHLORITE REPLICATE K ANALYSES 2779 1 142.65 3 hornblende conventional K-Ar 130 "4.72E-04, 0.584E-04, 1.19E-04*" 0.744 1.59 59 age of intrusion 25% QUARTZ AND FELDSPAR DUPLICATE K ANALYSES 2780 1 156.77 3 biotite conventional K-Ar 132 "4.72E-04, 0.584E-04, 1.19E-04*" 7.04 16.6 89 age of intrusion 3% CHLORITE AND MONTMORILLONITE DUPLICATE K ANALYSES 2781 1 102.02 2 biotite conventional K-Ar 190 "4.72E-04, 0.584E-04, 1.19E-04*" 6.77 10.23 85 "3% GARNET, 9% CHLORITE AND MONTMORILLONITE" REPLICATE K ANALYSES AGE IS PROBABLY JURASSIC 2782 1 141.61 3 biotite conventional K-Ar 216 "4.72E-04, 0.584E-04, 1.19E-04*" 7.69 16.31 90 age of intrusion 7% CHLORITE DUPLICATE K ANALYSES 2783 1 137.23 3 biotite conventional K-Ar 87 "4.72E-04, 0.584E-04, 1.19E-04*" 3.22 6.61 89 age of intrusion BIOTITE-HORNBLENDE MIXTURE DUPLICATE K ANALYSES 2784 1 121.27 2 biotite conventional K-Ar 180 "4.72E-04, 0.584E-04, 1.19E-04*" 5.41 9.77 80 initial age disturbed by later metamorphism 30% CHLORITE REPLICATE K ANALYSES 2785 1 29.21 0.6 muscovite conventional K-Ar 39 "4.72E-04, 0.584E-04, 1.19E-04*" 7.69 3.26 68 age not evaluated DUPLICATE K ANALYSES 2786 1 29.17 0.7 common micas conventional K-Ar 40 "4.72E-04, 0.584E-04, 1.19E-04*" 5.15 2.18 44 age not evaluated MUSCOVITE-BIOTITE MIXTURE DUPLICATE K ANALYSES 2787 1 29.41 0.6 muscovite conventional K-Ar 96 "4.72E-04, 0.584E-04, 1.19E-04*" 9.72 4.15 63 Armstrong and Hanson (1966) age of intrusion DUPLICATE K ANALYSES 2788 1 17.57 0.6 muscovite conventional K-Ar 97 "4.72E-04, 0.584E-04, 1.19E-04*" 4.17 1.06 39 Armstrong and Hanson (1966) age not evaluated MUSCOVITE-CHLORITE MIXTURE DUPLICATE K ANALYSES 2789 1 27.76 0.6 biotite conventional K-Ar 135 "4.72E-04, 0.584E-04, 1.19E-04*" 7.92 3.19 65 age not evaluated 8% CHLORITE DUPLICATE K ANALYSES 2790 1 21.12 0.4 biotite conventional K-Ar 136 "4.72E-04, 0.584E-04, 1.19E-04*" 8.99 2.75 58 age not evaluated 1% CHLORITE REPLICATE K ANALYSES 2791 1 49.97 1 biotite conventional K-Ar 142B "4.72E-04, 0.584E-04, 1.19E-04*" 9.39 6.85 92 Armstrong and Hanson (1966) age not evaluated DUPLICATE K ANALYSES 2792 1 68.03 1.4 biotite conventional K-Ar 143 "4.72E-04, 0.584E-04, 1.19E-04*" 5.17 5.16 89 Armstrong and Hanson (1966) minimum age of metamorphic crystallization 22% CHLORITE DUPLICATE ANALYSES 2793 1 60.12 1.2 whole rock conventional K-Ar 192B "4.72E-04, 0.584E-04, 1.19E-04*" 3.42 3.01 60 age not evaluated DUPLICATE K ANALYSES 2794 1 452.22 9 whole rock conventional K-Ar 219 "4.72E-04, 0.584E-04, 1.19E-04*" 2.78 20.57 92 Pierce and Armstrong (1966) minimum age of volcanism DUPLICATE K ANALYSES 2795 1 377.45 8 whole rock conventional K-Ar 220 "4.72E-04, 0.584E-04, 1.19E-04*" 2.48 14.99 91 Pierce and Armstrong (1966) DUPLICATE K ANALYSES MAY DATE THE TIME OF FAULTING 2796 1 34.91 2 hornblende conventional K-Ar 70 ACS 423 "4.72E-04, 0.585E-04, 1.19E-04*" 0.131 0.0665 17 age not evaluated DUPLICATE K20 ANALYSES 2797 1 305.56 9 biotite conventional K-Ar 68 ABG 247 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 42.28 94 age meaning uncertain (geologic factors) DUPLICATE K20 ANALYSES 2798 1 181.94 5 biotite conventional K-Ar 68 ABG 727 "4.72E-04, 0.585E-04, 1.19E-04*" 8.81 24.28 94 age meaning uncertain (geologic factors) DUPLICATE K20 ANALYSES 2799 1 66.39 2 biotite conventional K-Ar 72 ACY 127 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 9.055 87 minimum age of intrusion 2799 2 64.31 2 hornblende conventional K-Ar 72 ACY 127 "4.72E-04, 0.585E-04, 1.19E-04*" 0.782 0.7371 78 minimum age of intrusion DUPLICATE K20 ANALYSES 2800 1 67.27 2 biotite conventional K-Ar 72 ACY 117 "4.72E-04, 0.585E-04, 1.19E-04*" 9.33 9.207 79 minimum age of intrusion 2800 2 64.61 2 hornblende conventional K-Ar 72 ACY 117 "4.72E-04, 0.585E-04, 1.19E-04*" 1.042 0.9869 77 minimum age of intrusion DUPLICATE K20 ANALYSES 2801 1 445.54 13 amphiboles conventional K-Ar 66 AE 91 "4.72E-04, 0.585E-04, 1.19E-04*" 0.674 4.904 51 minimum age of volcanism DUPLICATE K20 ANALYSES 2802 1 450.75 13 amphiboles conventional K-Ar 65 AE 31 "4.72E-04, 0.585E-04, 1.19E-04*" 0.594 4.379 85 minimum age of volcanism DUPLICATE K20 ANALYSES 2803 1 286.67 9 amphiboles conventional K-Ar 71 AE 67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.653 2.921 79 initial age disturbed by later metamorphism DUPLICATE K20 ANALYSES 2804 1 114.42 3 amphiboles conventional K-Ar 71 AE 68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.842 1.432 67 age of intrusion DUPLICATE K20 ANALYSES 2805 1 67.28 2 biotite conventional K-Ar 69 ACK 1008 "4.72E-04, 0.585E-04, 1.19E-04*" 8.67 8.556 78 minimum age of intrusion DUPLICATE K20 ANALYSES 2806 1 2.91 0.14 whole rock conventional K-Ar 73 AHP 47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.866 0.0363 40 age of volcanism REPLICATE K20 ANALYSES 2807 1 65.8 2 hornblende conventional K-Ar 70 AMK 15D "4.72E-04, 0.585E-04, 1.19E-04*" 1.594 1.538 70 minimum age of intrusion DUPLICATE K20 ANALYSES 2807 2 56.91 2 biotite conventional K-Ar 70 AMK 15D "4.72E-04, 0.585E-04, 1.19E-04*" 8.71 7.25 46 minimum age of intrusion DUPLICATE K20 ANALYSES 2808 1 113.98 3 biotite conventional K-Ar 70 AMK 14A-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.71 13.06 91 age not evaluated DUPLICATE K20 ANALYSES 2809 1 122.15 4 hornblende conventional K-Ar 70 AMK 10B "4.72E-04, 0.585E-04, 1.19E-04*" 0.417 0.7587 66 maximum age of intrusion 2810 1 107.94 3 hornblende conventional K-Ar 70 AMK 8A-2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.858 1.374 72 age not evaluated DUPLICATE K20 ANALYSES 2810 2 110.6 3 biotite conventional K-Ar 70 AMK 8A-2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 13.63 85 age not evaluated DUPLICATE K20 ANALYSES 2811 1 30.02 1 biotite conventional K-Ar 70 AWK 6A "4.72E-04, 0.585E-04, 1.19E-04*" 7.22 3.147 60 minimum age of intrusion DUPLICATE K20 ANALYSES 2812 1 31.35 1 biotite conventional K-Ar 70 AWK 5D "4.72E-04, 0.585E-04, 1.19E-04*" 7.13 3.246 69 minimum age of intrusion DUPLICATE K20 ANALYSES 2813 1 33.83 1 hornblende conventional K-Ar 70 AMK 3C "4.72E-04, 0.585E-04, 1.19E-04*" 0.48 0.236 35 minimum age of intrusion 2814 1 23.25 1 biotite conventional K-Ar 70 AMK 3A "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 2.928 20 DUPLICATE K20 ANALYSES AGE MAY BE LOW DUE TO CATACLASIS 2815 1 113.41 3 hornblende conventional K-Ar 70 AWK 2A "4.72E-04, 0.585E-04, 1.19E-04*" 0.934 1.574 87 age of intrusion DUPLICATE K20 ANALYSES 2815 2 112.32 3 biotite conventional K-Ar 70 AWK 2A "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 14.8 93 age of intrusion 2816 1 144.9 4 hornblende conventional K-Ar 71 AMK 26A "4.72E-04, 0.585E-04, 1.19E-04*" 0.813 1.766 76 age not evaluated 2817 1 148.35 4 hornblende conventional K-Ar 71 AMK 19C "4.72E-04, 0.585E-04, 1.19E-04*" 0.681 1.516 77 age not evaluated DUPLICATE K20 ANALYSES 2818 1 3.84 0.8 hornblende conventional K-Ar 70 AMK 61C "4.72E-04, 0.585E-04, 1.19E-04*" 0.468 0.0259 5 age of intrusion 2819 1 145.56 4 hornblende conventional K-Ar 70 AMK 60D-2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8 1.746 77 age not evaluated 2820 1 137.49 7 hornblende conventional K-Ar 70 AMK 60B "4.72E-04, 0.585E-04, 1.19E-04*" 0.704 1.448 30 age not evaluated DUPLICATE K20 ANALYSES 2821 1 57.94 2 hornblende conventional K-Ar 70 AMA 226 "4.72E-04, 0.585E-04, 1.19E-04*" 1.062 0.9003 52 age of intrusion DUPLICATE K20 ANALYSES 2821 2 57.8 2 biotite conventional K-Ar 70 AMA 226 "4.72E-04, 0.585E-04, 1.19E-04*" 7.37 6.232 79 age of intrusion 2822 1 59.1 2 hornblende conventional K-Ar 67 AMA 226 "4.72E-04, 0.585E-04, 1.19E-04*" 1.058 0.9151 73 age of intrusion DUPLICATE K20 ANALYSES 2822 2 58.1 2 biotite conventional K-Ar 67 AMA 226 "4.72E-04, 0.585E-04, 1.19E-04*" 7.22 6.138 86 age of intrusion DUPLICATE K20 ANALYSES 2823 1 94.59 2.6 hornblende conventional K-Ar 70 AMM 158B "4.72E-04, 0.585E-04, 1.19E-04*" 0.894 1.25 81 age not evaluated DUPLICATE K20 ANALYSES 2823 2 90.48 1.5 biotite conventional K-Ar 70 AMM 158B "4.72E-04, 0.585E-04, 1.19E-04*" 7.8 10.42 93 age not evaluated DUPLICATE K20 ANALYSES 2824 1 96.23 3 biotite 71 AMM 415A "4.72E-04, 0.585E-04, 1.19E-04*" 8.96 12.75 78 age not evaluated DUPLICATE K20 ANALYSES 2825 1 96.21 3 biotite conventional K-Ar 71 AGK 259 "4.72E-04, 0.585E-04, 1.19E-04*" 7.12 10.13 68 age not evaluated DUPLICATE K20 ANALYSES 2826 1 61.37 1.8 biotite conventional K-Ar S-70 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 7.46 85 minimum age of intrusion DUPLICATE K20 ANALYSES 2827 1 11.39 3 hornblende conventional K-Ar 54 SN 197 "4.72E-04, 0.585E-04, 1.19E-04*" 0.354 0.0582 5 minimum age of intrusion DUPLICATE K20 ANALYSES 2827 2 3.45 0.2 biotite conventional K-Ar 54 SN 197 "4.72E-04, 0.585E-04, 1.19E-04*" 7.54 0.3754 32 initial age disturbed by later metamorphism THERMAL EVENT RELATED TO LATE-CENOZOIC MAKUSHIN VOLCANO 2828 1 17.51 1 biotite conventional K-Ar 12-100 "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 1.902 30 age not evaluated 2829 1 15.02 1 plagioclase conventional K-Ar 69 C 24 "4.72E-04, 0.585E-04, 1.19E-04*" 0.247 0.0536 16 age of intrusion 2830 1 88.83 2.6 biotite conventional K-Ar HAIWEE-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.78 11.51 89 age not evaluated DUPLICATE K20 ANALYSES 2831 1 0.09 0.01 whole rock conventional K-Ar H72-52 "4.72E-04, 0.585E-04, 1.19E-04*" 4.72 0.0062 9 age not evaluated DUPLICATE K20 ANALYSES 2832 1 0.48 0.01 whole rock conventional K-Ar H72-1 "4.72E-04, 0.585E-04, 1.19E-04*" 4.74 0.0327 33 age not evaluated DUPLICATE K20 ANALYSES 2833 1 0.55 0.02 whole rock conventional K-Ar H72-73DI "4.72E-04, 0.585E-04, 1.19E-04*" 4.68 0.0372 41 age not evaluated DUPLICATE K20 ANALYSES 2834 1 83.89 2.5 biotite conventional K-Ar A-240 "4.72E-04, 0.585E-04, 1.19E-04*" 6.9 8.53 89 age not evaluated DUPLICATE K20 ANALYSES 2835 1 570 7 lamprobolite 39Ar-40Ar total fusion 72 MC-117E "4.72E-04, 0.585E-04, 1.19E-04" 91 age of volcanism 39AR-40AR AGE; ADDITIONAL DATA IN ARTICLE 2836 1 100.95 3 hornblende conventional K-Ar T-152 "4.72E-04, 0.585E-04, 1.19E-04*" 1.259 1.882 83 age not evaluated DUPLICATE K20 ANALYSES 2836 2 92.35 2.7 biotite conventional K-Ar T-152 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 12.36 94 age not evaluated DUPLICATE K20 ANALYSES 2837 1 95.9 2.8 hornblende conventional K-Ar T-153 "4.72E-04, 0.585E-04, 1.19E-04*" 0.578 0.8196 51 age not evaluated DUPLICATE K20 ANALYSES 2837 2 90.75 2.7 biotite conventional K-Ar T-153 "4.72E-04, 0.585E-04, 1.19E-04*" 9 12.06 93 age not evaluated DUPLICATE K20 ANALYSES 2838 1 90.68 2.7 muscovite conventional K-Ar T-154 "4.72E-04, 0.585E-04, 1.19E-04*" 10.3 13.79 77 age not evaluated DUPLICATE K20 ANALYSES 2838 2 94.02 2.8 biotite conventional K-Ar T-154 "4.72E-04, 0.585E-04, 1.19E-04*" 9.32 12.95 94 age not evaluated DUPLICATE K20 ANALYSES 2839 1 96.94 2.8 muscovite conventional K-Ar T-155 "4.72E-04, 0.585E-04, 1.19E-04*" 10.74 15.4 67 age not evaluated DUPLICATE K20 ANALYSES 2839 2 110.67 3 biotite conventional K-Ar T-155 "4.72E-04, 0.585E-04, 1.19E-04*" 9.39 15.43 93 age not evaluated DUPLICATE K20 ANALYSES 2840 1 83.2 2.4 hornblende conventional K-Ar T-156 "4.72E-04, 0.585E-04, 1.19E-04*" 0.564 0.6914 61 age not evaluated DUPLICATE K20 ANALYSES 2840 2 80.74 2.4 biotite conventional K-Ar T-156 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 10.89 90 age not evaluated DUPLICATE K20 ANALYSES 2841 1 43.95 1.3 hornblende conventional K-Ar C-559 "4.72E-04, 0.585E-04, 1.19E-04*" 0.56 0.3587 27 age not evaluated DUPLICATE K20 ANALYSES 2842 1 100.22 2.9 biotite conventional K-Ar H-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 13.16 90 age not evaluated DUPLICATE K20 ANALYSES 2843 1 2379.18 120 biotite conventional K-Ar 3(KA-307) "4.72E-04, 0.585E-04, 1.19E-04*" 8.8 626 Goldich and others (1961) initial age disturbed by later metamorphism 2844 1 2392.78 120 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.07 580 initial age disturbed by later metamorphism 2866 1 997.29 50 biotite conventional K-Ar KA-93B "4.76E-04, 0.589E-04, 1.18E-04*" 5.79 111 age of intrusion DUPLICATE ARGON ANALYSES 2866 2 1047.24 K feldspar KA-93F "4.76E-04, 0.589E-04, 1.18E-04*" 12.77 261 NO AGE CALCULATED 2867 1 457.49 23 glauconite conventional K-Ar KA-113 "4.76E-04, 0.589E-04, 1.18E-04*" 7.87 59 AGE IS TOO YOUNG 2868 1 436.45 22 glauconite conventional K-Ar KA-114 "4.76E-04, 0.589E-04, 1.18E-04*" 7.99 56.8 AGE TOO YOUNG 2869 1 445.94 22 glauconite conventional K-Ar KA-192 "4.76E-04, 0.589E-04, 1.18E-04*" 7.73 56.3 AGE TOO YOUNG 2870 1 1973.36 100 biotite conventional K-Ar 57B "4.76E-04, 0.589E-04, 1.18E-04*" 7.62 393 Goldich and others (1970) initial age disturbed by later metamorphism DUPLICATE ARGON ANALYSES 2870 2 1700.18 K feldspar 57F "4.76E-04, 0.589E-04, 1.18E-04*" 11.8 480 NO AGE CALCULATED 2871 1 1066.26 50 biotite conventional K-Ar 128B "4.76E-04, 0.589E-04, 1.18E-04*" 8.17 171 age of intrusion 2872 1 754.54 40 illite group conventional K-Ar 190 "4.76E-04, 0.589E-04, 1.18E-04*" 10.38 140 AGE TOO YOUNG 2873 1 337.57 16 muscovite conventional K-Ar OSH "4.76E-04, 0.589E-04, 1.18E-04*" 10.16 54.3 minimum age of intrusion 2874 1 55.63 1.5 hornblende conventional K-Ar LS-1-63 "4.72E-04, 0.584E-04, 1.19E-04*" 1.15 0.9354 75 Jaffe and others (1959) "maximum age of intrusion, sample contains excess radiogenic argon, age is too old" 40AR CALCULATED BY COMPILER 2876 1 23.01 3.3 augite-ferroaugite conventional K-Ar LS-2-63 "4.72E-04, 0.584E-04, 1.19E-04*" 0.065 0.0217 13 age of intrusion 40AR CALCULATED BY COMPILER 2877 1 26.16 2.5 augite-ferroaugite conventional K-Ar LS-3-63 "4.72E-04, 0.584E-04, 1.19E-04*" 0.116 0.044 20 age of intrusion 40AR CALCULATED BY COMPILER 2878 1 40.4 phlogopite conventional K-Ar MC-66 "4.72E-04, 0.585E-04, 1.19E-04" 9.16 64 age of intrusion 2878 2 39.4 phlogopite conventional K-Ar MC-66 "4.72E-04, 0.585E-04, 1.19E-04" 9.16 74 age of intrusion 2879 1 36.5 phlogopite conventional K-Ar MC-104 "4.72E-04, 0.585E-04, 1.19E-04" 9.76 70 age of volcanism 2879 2 37.4 phlogopite conventional K-Ar MC-104 "4.72E-04, 0.585E-04, 1.19E-04" 9.76 65 age of volcanism 2880 1 13.7 phlogopite conventional K-Ar WC-2 "4.72E-04, 0.585E-04, 1.19E-04" 9.64 34 age of intrusion 2880 2 12.8 phlogopite conventional K-Ar WC-2 "4.72E-04, 0.585E-04, 1.19E-04" 9.64 40 age of intrusion 2881 1 38.7 whole rock conventional K-Ar WST-15 "4.72E-04, 0.585E-04, 1.19E-04" 5.54 80 age of intrusion 2882 1 31.91 0.9 muscovite conventional K-Ar PED-56-66 "4.76E-04, 0.589E-04, 1.18E-04*" 10.12 4.69 90 initial age disturbed by later metamorphism COARSE-GRAINED MAY INDICATE MAXIMUM AGE OF UPLIFT AND COOLING 2883 1 27.96 0.9 biotite conventional K-Ar PED-20-62 "4.76E-04, 0.589E-04, 1.18E-04*" 7.1 2.88 72 "age of uplift and cooling, initial age disturbed by later metamorphism" 2884 1 30.17 1 muscovite conventional K-Ar AH-L6 "4.76E-04, 0.589E-04, 1.18E-04*" 9.93 4.35 49 "age of uplift and cooling, initial age disturbed by later metamorphism" 2885 1 27.57 0.9 muscovite conventional K-Ar AH-L77 "4.76E-04, 0.589E-04, 1.18E-04*" 8.1 3.24 73 "age of uplift and cooling, initial age disturbed by later metamorphism" 2903 1 27.5 0.4 biotite conventional K-Ar 156 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2904 1 30.6 0.3 biotite conventional K-Ar 200 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2905 1 0.03 0.04 whole rock conventional K-Ar P-CL "4.72E-04, 0.585E-04, 1.19E-04" 0.0043 0 minimum age of volcanism NO POTASSIUM VALUE GIVEN "AGE RANGE IS 30,000-128,000 YEARS." 2906 1 0.03 0.05 whole rock conventional K-Ar P-21-1 "4.72E-04, 0.585E-04, 1.19E-04" 0.0113 1 minimum age of volcanism NO POTASSIUM VALUE GIVEN "AGE RANGE IS 30,000-128,000 YEARS." 2906 2 0.07 0.06 whole rock conventional K-Ar P-29-2 "4.72E-04, 0.585E-04, 1.19E-04" 0.0202 1 minimum age of volcanism NO POTASSIUM VALUE GIVEN 2907 1 0.09 0.08 whole rock conventional K-Ar P-31-1 "4.72E-04, 0.585E-04, 1.19E-04" 0.026 1 age of volcanism NO POTASSIUM VALUE GIVEN "AGE RANGE IS 30,000-128,000 YEARS." 2907 2 0.13 0.1 whole rock conventional K-Ar P-31-2 "4.72E-04, 0.585E-04, 1.19E-04" 0.0362 1 age of volcanism NO POTASIUM VALUE GIVEN 2908 1 0.5 0.09 whole rock conventional K-Ar B-03 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 5 AGE DETERMINATIONS IS 536,000 YEARS." 2908 2 0.55 0.1 whole rock conventional K-Ar B-03 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2909 1 0.58 0.13 whole rock conventional K-Ar B-04 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 5 AGE DETERMINATIONS IS 536,000 YEARS." 2909 2 0.55 0.12 whole rock conventional K-Ar B-04 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2909 3 0.5 0.11 whole rock conventional K-Ar B-04 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2910 1 0.72 0.08 whole rock conventional K-Ar K-03 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 2 AGE DETERMINATIONS IS 667,000 YEARS." 2910 2 0.62 0.06 whole rock conventional K-Ar K-03 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2911 1 0.99 0.09 whole rock conventional K-Ar B-10 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 6 AGE DETERMINATIONS IS 918,000 YEARS." 2912 1 0.88 0.08 whole rock conventional K-Ar B-11 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 6 AGE DETERMINATIONS IS 918,000 YEARS." 2913 1 0.96 0.1 whole rock conventional K-Ar B-12 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 6 AGE DETERMINATIONS IS 918,000 YEARS." 2913 2 0.94 0.07 whole rock conventional K-Ar B-12 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2914 1 0.89 0.06 whole rock conventional K-Ar B-19 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AVERAGE OF 6 AGE DETERMINATIONS IS 918,000 YEARS." 2914 2 0.85 0.06 whole rock conventional K-Ar B-19 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 2915 1 32.8 0.5 whole rock conventional K-Ar R-21 "4.72E-04, 0.585E-04, 1.19E-04" 1.1159 85 age of volcanism 2916 1 0.44 0.04 whole rock conventional K-Ar R-29 "4.72E-04, 0.585E-04, 1.19E-04" 0.0134 11 age of volcanism 2917 1 19.7 0.5 whole rock conventional K-Ar R-28 "4.72E-04, 0.585E-04, 1.19E-04" 0.4481 27 age of intrusion 2918 1 19 0.6 whole rock conventional K-Ar R-34 "4.72E-04, 0.585E-04, 1.19E-04" 1.1349 33 age of volcanism 2919 1 20.6 0.4 whole rock conventional K-Ar R-38 "4.72E-04, 0.585E-04, 1.19E-04" 0.9865 63 age of volcanism 2920 1 21.9 0.4 biotite conventional K-Ar R-31 "4.72E-04, 0.585E-04, 1.19E-04" 2.7291 74 age of volcanism 2921 1 21.7 0.4 biotite conventional K-Ar R-32 "4.72E-04, 0.585E-04, 1.19E-04" 2.7114 71 age of volcanism 2922 1 21.8 0.4 sanidine conventional K-Ar R-16 "4.72E-04, 0.585E-04, 1.19E-04" 2.8002 81 age of volcanism 2923 1 21.8 0.4 biotite conventional K-Ar EM-1 "4.72E-04, 0.585E-04, 1.19E-04" 2.7366 67 age of volcanism 2924 1 21.8 0.4 whole rock conventional K-Ar R-17 "4.72E-04, 0.585E-04, 1.19E-04" 0.937 87 age of volcanism 2925 1 22.3 0.4 whole rock conventional K-Ar R-20 "4.72E-04, 0.585E-04, 1.19E-04" 1.1125 87 age of volcanism 2926 1 22.2 0.4 whole rock conventional K-Ar R-22 "4.72E-04, 0.585E-04, 1.19E-04" 1.1181 86 age of volcanism 2927 1 22.8 0.4 biotite conventional K-Ar R-3 "4.72E-04, 0.585E-04, 1.19E-04" 2.9377 65 age of volcanism 2928 1 22.1 0.4 biotite conventional K-Ar R-12 "4.72E-04, 0.585E-04, 1.19E-04" 2.7345 69 age of volcanism 2929 1 22.4 0.4 biotite conventional K-Ar R-24 "4.72E-04, 0.585E-04, 1.19E-04" 2.8156 79 age of volcanism 2930 1 22.3 0.4 biotite conventional K-Ar ES-1 "4.72E-04, 0.585E-04, 1.19E-04" 2.8518 52 age of volcanism 2931 1 22.1 0.6 plagioclase conventional K-Ar R-11 "4.72E-04, 0.585E-04, 1.19E-04" 0.3999 42 age of volcanism 2932 1 22.9 0.4 whole rock conventional K-Ar R-23 "4.72E-04, 0.585E-04, 1.19E-04" 0.6932 82 age of intrusion 2933 1 20.7 0.5 whole rock conventional K-Ar R-27 "4.72E-04, 0.585E-04, 1.19E-04" 0.5109 52 age of volcanism 2934 1 26 0.8 hornblende conventional K-Ar R-19 "4.72E-04, 0.585E-04, 1.19E-04" 0.3696 39 age of volcanism 2935 1 25.1 0.7 whole rock conventional K-Ar R-5 "4.72E-04, 0.585E-04, 1.19E-04" 0.4659 41 age of volcanism 2936 1 25.1 0.4 biotite conventional K-Ar R-1 "4.72E-04, 0.585E-04, 1.19E-04" 2.953 66 age of volcanism 2937 1 25.5 0.5 plagioclase conventional K-Ar R-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.3888 39 age of volcanism 2938 1 24.4 0.8 plagioclase conventional K-Ar R-15 "4.72E-04, 0.585E-04, 1.19E-04" 0.2839 27 age of volcanism 2939 1 23.9 0.5 plagioclase conventional K-Ar R-9 "4.72E-04, 0.585E-04, 1.19E-04" 0.361 36 age of volcanism 2940 1 24 0.4 biotite conventional K-Ar R-10 "4.72E-04, 0.585E-04, 1.19E-04" 3.1024 56 age of volcanism 2941 1 25 0.4 plagioclase conventional K-Ar R-8 "4.72E-04, 0.585E-04, 1.19E-04" 0.4476 56 age of volcanism 2942 1 25.2 0.4 plagioclase conventional K-Ar R-7 "4.72E-04, 0.585E-04, 1.19E-04" 0.4546 33 age of volcanism 2943 1 28.7 0.5 biotite conventional K-Ar R-25 "4.72E-04, 0.585E-04, 1.19E-04" 3.7 63 age of volcanism 2944 1 31.1 0.5 biotite conventional K-Ar R-4 "4.72E-04, 0.585E-04, 1.19E-04" 3.7946 67 age of volcanism 2960 1 114.43 2 biotite conventional K-Ar SC-69-1B "4.72E-04, 0.584E-04, 1.19E-04*" 7.085 12.05 86 age of intrusion 2961 1 66.41 1.3 biotite conventional K-Ar SC-69-7 "4.72E-04, 0.584E-04, 1.19E-04*" 7.61 7.411 73 age not evaluated 2961 2 72.72 1.4 muscovite conventional K-Ar SC-69-7 "4.72E-04, 0.584E-04, 1.19E-04*" 9.37 10.01 72 age not evaluated 2962 1 69.61 1.4 biotite conventional K-Ar SC-69-8 "4.72E-04, 0.584E-04, 1.19E-04*" 8.315 8.496 80 age not evaluated 2963 1 71.2 1 biotite conventional K-Ar SC-69-9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.39 8.772 8563 age not evaluated POTASSIUM AND ARGON VALUES ARE AVERAGES 2964 1 72.91 1 biotite conventional K-Ar SC-69-10 "4.72E-04, 0.584E-04, 1.19E-04*" 7.4 7.927 7379 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES 2964 2 109.26 1.5 biotite - hornblende conventional K-Ar SC-69-10 "4.72E-04, 0.584E-04, 1.19E-04*" 5.69 9.227 5783 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2965 1 93.26 1.5 hornblende - biotite conventional K-Ar SC-69-11 "4.72E-04, 0.584E-04, 1.19E-04*" 2.675 3.686 4752 "minimum age of intrusion, may denote delayed cooling" POTASSIUM AND ARGON VALUES ARE AVERAGES 2966 1 148.73 2 biotite conventional K-Ar SC-69-12 "4.72E-04, 0.584E-04, 1.19E-04*" 5.86 13.08 8050 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2967 1 73.03 1 biotite conventional K-Ar SC-69-13 "4.72E-04, 0.584E-04, 1.19E-04*" 6.13 6.577 8079 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2968 1 73.01 1.4 biotite conventional K-Ar SC-69-14 "4.72E-04, 0.584E-04, 1.19E-04*" 7.77 8.335 78 minimum age of intrusion 2969 1 71.88 1 biotite conventional K-Ar SC-69-16 "4.72E-04, 0.584E-04, 1.19E-04*" 7.745 8.177 8386 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2970 1 83.92 1.2 hornblende - biotite conventional K-Ar SC-69-17 "4.72E-04, 0.584E-04, 1.19E-04*" 1.99 2.461 4358 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2971 1 73.92 1.4 biotite conventional K-Ar SC-69-18 "4.72E-04, 0.584E-04, 1.19E-04*" 8.19 8.897 76 minimum age of intrusion 2972 1 72.68 1.4 biotite conventional K-Ar SC-69-19 "4.72E-04, 0.584E-04, 1.19E-04*" 7.995 8.536 86 age not evaluated 2973 1 70.19 1 biotite conventional K-Ar SC-69-20 "4.72E-04, 0.584E-04, 1.19E-04*" 8.5 8.759 7779 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES 2973 2 80.06 1 hornblende conventional K-Ar SC-69-20 "4.72E-04, 0.584E-04, 1.19E-04*" 1.21 1.426 5954 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2974 1 73.83 1 biotite conventional K-Ar SC-69-21 "4.72E-04, 0.584E-04, 1.19E-04*" 8.28 8.984 8680 age not evaluated POTASSIUM AND ARGON VALUES ARE AVERAGES 2975 1 83.29 1.2 biotite conventional K-Ar SC-69-22 "4.72E-04, 0.584E-04, 1.19E-04*" 6.59 8.087 7268 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES 2975 2 198.21 3 hornblende conventional K-Ar SC-69-22 "4.72E-04, 0.584E-04, 1.19E-04*" 0.801 2.416 5647 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2976 1 80.28 1.2 biotite conventional K-Ar SC-69-23 "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 10.14 8149 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2977 1 74.17 1.4 biotite conventional K-Ar SC-69-24 "4.72E-04, 0.584E-04, 1.19E-04*" 7.27 7.925 77 minimum age of intrusion 2978 1 70.69 1.4 biotite conventional K-Ar SC-69-26 "4.72E-04, 0.584E-04, 1.19E-04*" 8.86 9.196 74 minimum age of intrusion 2979 1 79 1.1 biotite conventional K-Ar SC-69-27 "4.72E-04, 0.584E-04, 1.19E-04*" 8.51 9.894 7165 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2980 1 92.75 2 biotite conventional K-Ar SC-69-28 "4.72E-04, 0.584E-04, 1.19E-04*" 2.69 3.686 46 minimum age of intrusion POTASSIUM VALUE LOW FOR BIOTITE--COMPILER 2980 2 91.74 1.8 hornblende conventional K-Ar SC-69-28 "4.72E-04, 0.584E-04, 1.19E-04*" 1.11 1.504 56 minimum age of intrusion 2981 1 90.22 1.3 biotite conventional K-Ar SC-69-30 "4.72E-04, 0.584E-04, 1.19E-04*" 5.98 7.965 7573 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2981 2 96.91 1.5 hornblende conventional K-Ar SC-69-30 "4.72E-04, 0.584E-04, 1.19E-04*" 0.459 0.6579 6025 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES MORTON (1969) AND EVERNDEN AND KISTLER (1970) REPORT SIMILAR DATES IN LAKEVIEW MTNS. 2982 1 88.7 1.3 muscovite conventional K-Ar SC-69-33 "4.72E-04, 0.584E-04, 1.19E-04*" 6.56 8.587 7876 "minimum age of intrusion, may denote delayed cooling" POTASSIUM AND ARGON VALUES ARE AVERAGES; POTASSIUM VALUE LOW FOR MUSCOVITE--COMPILER. ZONED PEGMATITE WITHIN LAKEVIEW MTNS. PLUTON (QUARTZ DIORITE) 2983 1 94.71 1.8 biotite conventional K-Ar SC-69-36 "4.72E-04, 0.584E-04, 1.19E-04*" 7.8 10.92 78 minimum age of intrusion 2983 2 93.98 1.8 hornblende conventional K-Ar SC-69-36 "4.72E-04, 0.584E-04, 1.19E-04*" 0.887 1.232 66 minimum age of intrusion MORTON (1964) AND EVERNDEN AND KISTLER (1970) REPORT SIMILAR DATES FOR LAKEVIEW MTNS. 2984 1 92.49 1.8 biotite conventional K-Ar SC-69-37 "4.72E-04, 0.584E-04, 1.19E-04*" 8.98 12.27 83 minimum age of intrusion 2984 2 92.62 1.8 biotite conventional K-Ar SC-69-37 "4.72E-04, 0.584E-04, 1.19E-04*" 8.5 11.63 91 minimum age of intrusion LESS PURE BIOTITE 2985 1 89.7 1.7 biotite conventional K-Ar SC-69-39 "4.72E-04, 0.584E-04, 1.19E-04*" 8.98 11.89 89 minimum age of intrusion 2985 2 91.66 1.8 hornblende conventional K-Ar SC-69-39 "4.72E-04, 0.584E-04, 1.19E-04*" 1.21 1.638 57 minimum age of intrusion 2986 1 89.14 1.3 biotite conventional K-Ar SC-69-40 "4.72E-04, 0.584E-04, 1.19E-04*" 9 11.84 8478 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2986 2 86.12 1.7 hornblende conventional K-Ar SC-69-40 "4.72E-04, 0.584E-04, 1.19E-04*" 1.76 2.235 70 minimum age of intrusion 2987 1 81.18 1.1 biotite conventional K-Ar SC-69-41 "4.72E-04, 0.584E-04, 1.19E-04*" 8 9.564 7488 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2987 2 85.08 1.2 hornblende conventional K-Ar SC-69-41 "4.72E-04, 0.584E-04, 1.19E-04*" 1.64 2.057 7262 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2988 1 85.16 1.7 biotite conventional K-Ar SC-69-42 "4.72E-04, 0.584E-04, 1.19E-04*" 8.65 10.86 79 minimum age of intrusion 2989 1 83.76 1.2 biotite conventional K-Ar SC-69-43 "4.72E-04, 0.584E-04, 1.19E-04*" 8.15 10.06 6669 may denote delayed cooling POTASSIUM AND ARGON VALUES ARE AVERAGES 2989 2 89.93 1.4 biotite conventional K-Ar SC-69-43 "4.72E-04, 0.584E-04, 1.19E-04*" 8.67 11.51 8579 "minimum age of intrusion, may denote delayed cooling" PURER BIOTITE CONCENTRATE POTASSIUM AND ARGON VALUES ARE AVERAGES 2989 3 91.24 1.8 hornblende conventional K-Ar SC-69-43 "4.72E-04, 0.584E-04, 1.19E-04*" 1.52 2.048 63 minimum age of intrusion 2990 1 77.2 1.1 biotite conventional K-Ar SC-69-44 "4.72E-04, 0.584E-04, 1.19E-04*" 7.86 8.926 8262 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2991 1 69.99 1 biotite conventional K-Ar SC-69-46 "4.72E-04, 0.584E-04, 1.19E-04*" 8.8 9.042 8287 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2992 1 65.21 1 biotite conventional K-Ar SC-69-47 "4.72E-04, 0.584E-04, 1.19E-04*" 8.6 8.221 8682 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2992 2 68.16 10 hornblende conventional K-Ar SC-69-47 "4.72E-04, 0.584E-04, 1.19E-04*" 2.24 2.24 6363 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2993 1 73.01 1 biotite conventional K-Ar SC-69-48 "4.72E-04, 0.584E-04, 1.19E-04*" 7.525 8.072 7667 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 2993 2 75.42 1.5 hornblende conventional K-Ar SC-69-48 "4.72E-04, 0.584E-04, 1.19E-04*" 2.04 2.262 71 minimum age of intrusion POTASSIUM VALUE IS AVERAGE OF FOUR ANALYSES 2994 1 24.9 0.5 biotite conventional K-Ar SC-69-49 "4.72E-04, 0.584E-04, 1.19E-04*" 7.32 2.642 52 initial age disturbed by later metamorphism 2994 2 30.67 0.6 muscovite conventional K-Ar SC-69-49 "4.72E-04, 0.584E-04, 1.19E-04*" 7.935 3.534 48 initial age disturbed by later metamorphism 2995 1 37.74 1.2 hornblende conventional K-Ar SC-69-51 "4.72E-04, 0.584E-04, 1.19E-04*" 0.703 0.386 2414 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES 2995 2 51.76 0.8 muscovite conventional K-Ar SC-69-51 "4.72E-04, 0.584E-04, 1.19E-04*" 7.13 5.39 4945 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES 2996 1 59.49 0.8 muscovite conventional K-Ar SC-69-52 "4.72E-04, 0.584E-04, 1.19E-04*" 9.27 8.072 6950 minimum age of metamorphic crystallization POTASSIUM AND ARGON VALUES ARE AVERAGES 2997 1 64.24 1.3 biotite conventional K-Ar SC-69-53 "4.72E-04, 0.584E-04, 1.19E-04*" 5.905 5.56 70 minimum age of intrusion 2997 2 62.81 1.2 hornblende conventional K-Ar SC-69-53 "4.72E-04, 0.584E-04, 1.19E-04*" 1.44 1.325 76 minimum age of intrusion 2998 1 55.43 0.8 biotite conventional K-Ar SC-69-55A "4.72E-04, 0.584E-04, 1.19E-04*" 9.23 7.48 6551 minimum age of metamorphic crystallization POTASSIUM AND ARGON VALUES ARE AVERAGES 2998 2 22.07 0.5 biotite conventional K-Ar SC-69-55B "4.72E-04, 0.584E-04, 1.19E-04*" 7.03 2.247 4721 age not evaluated IMPURE BIOTITE CONCENTRATE POTASSIUM AND ARGON VALUES ARE AVERAGES 2999 1 54.24 0.8 biotite conventional K-Ar SC-69-56 "4.72E-04, 0.584E-04, 1.19E-04*" 8.48 6.722 6171 minimum age of metamorphic crystallization POTASSIUM AND ARGON VALUES ARE AVERAGES 3000 1 57.72 0.8 biotite conventional K-Ar SC-69-57 "4.72E-04, 0.584E-04, 1.19E-04*" 8.465 7.148 6658 age not evaluated POTASSIUM AND ARGON VALUES ARE AVERAGES 3001 1 65.03 1.3 biotite conventional K-Ar SC-69-59 "4.72E-04, 0.584E-04, 1.19E-04*" 7.47 7.121 83 minimum age of intrusion 3002 1 65.98 1.3 biotite conventional K-Ar SC-69-60 "4.72E-04, 0.584E-04, 1.19E-04*" 8.32 8.049 78 minimum age of intrusion -40+60 MESH 3002 2 64.12 1.3 biotite conventional K-Ar SC-69-60 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 8.505 77 minimum age of intrusion -60+100 MESH 3003 1 95.15 1.9 biotite conventional K-Ar SC-69-62 "4.72E-04, 0.584E-04, 1.19E-04*" 8.36 11.76 69 minimum age of intrusion "BISHOP, 1963, REPORTED K-AR DATE OF 98.5 M.Y. FROM NEARBY LOCATION" 3004 1 98.09 1.9 biotite conventional K-Ar SC-69-63 "4.72E-04, 0.584E-04, 1.19E-04*" 8 11.61 86 minimum age of intrusion 3005 1 96 1.9 biotite conventional K-Ar SC-69-64 "4.72E-04, 0.584E-04, 1.19E-04*" 7.15 10.15 76 minimum age of intrusion 3005 2 90.56 1.9 hornblende conventional K-Ar SC-69-64 "4.72E-04, 0.584E-04, 1.19E-04*" 1.32 1.765 2837 age not evaluated POTASSIUM AND ARGON VALUES ARE AVERAGES 3006 1 65.64 1.3 biotite conventional K-Ar SC-69-65 "4.72E-04, 0.584E-04, 1.19E-04*" 7.7 7.411 82 minimum age of intrusion 3006 2 67.26 0.9 muscovite conventional K-Ar SC-69-65 "4.72E-04, 0.584E-04, 1.19E-04*" 8.85 8.732 6086 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3007 1 63.82 1.2 biotite conventional K-Ar SC-69-66 "4.72E-04, 0.584E-04, 1.19E-04*" 8.65 8.09 75 "minimum age of intrusion, initial age disturbed by later metamorphism" 3007 2 66.89 0.9 muscovite conventional K-Ar SC-69-66 "4.72E-04, 0.584E-04, 1.19E-04*" 9.34 9.163 6961 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3008 1 70.83 1 biotite conventional K-Ar SC-69-67 "4.72E-04, 0.584E-04, 1.19E-04*" 8.1 8.424 8077 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3009 1 54.88 1.5 biotite conventional K-Ar SC-69-68 "4.72E-04, 0.584E-04, 1.19E-04*" 6.36 5.102 2332 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES 3009 2 68.83 1 muscovite conventional K-Ar SC-69-68 "4.72E-04, 0.584E-04, 1.19E-04*" 9.92 10.02 7878 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3010 1 68.58 0.9 biotite conventional K-Ar SC-69-69 "4.72E-04, 0.584E-04, 1.19E-04*" 5.86 5.897 6385 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3010 2 68.57 0.9 muscovite conventional K-Ar SC-69-69 "4.72E-04, 0.584E-04, 1.19E-04*" 9.09 9.147 6261 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3011 1 145.05 3 biotite conventional K-Ar SC-69-70 "4.72E-04, 0.584E-04, 1.19E-04*" 6.19 13.46 79 initial age disturbed by later metamorphism "BISHOP, 1963, REPORTS A U-PB AGE OF 165 M.Y. FOR THIS PLUTON" 3012 1 157.76 2 biotite conventional K-Ar SC-69-71 "4.72E-04, 0.584E-04, 1.19E-04*" 7.12 16.9 8580 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES "BISHOP, 1963, REPORTS A U-PB AGE OF 165 M.Y. FOR THIS PLUTON" 3013 1 70.46 1.4 biotite conventional K-Ar SC-69-73 "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 8.576 87 minimum age of intrusion 3014 1 71.95 1 biotite conventional K-Ar SC-69-75 "4.72E-04, 0.584E-04, 1.19E-04*" 7.46 7.884 8070 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3015 1 150.95 2 biotite conventional K-Ar SC-69-77 "4.72E-04, 0.584E-04, 1.19E-04*" 5.66 12.83 8270 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3016 1 73.58 1.4 biotite conventional K-Ar SC-69-78A "4.72E-04, 0.584E-04, 1.19E-04*" 5.443 5.885 71 minimum age of intrusion IMPURE BIOTITE CONCENTRATE 3016 2 70.82 1.4 biotite conventional K-Ar SC-69-78B "4.72E-04, 0.584E-04, 1.19E-04*" 8.77 9.12 81 minimum age of intrusion 3017 1 137.93 2 biotite conventional K-Ar SC-69-79 "4.72E-04, 0.584E-04, 1.19E-04*" 8.16 16.84 8585 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES "HEWITT AND GLASS, 1953, REPORT A U-PB AGE OF 160 M.Y. FOR NEARBY PEGMATITE." 3018 1 138.66 2 biotite conventional K-Ar SC-69-80 "4.72E-04, 0.584E-04, 1.19E-04*" 8.93 18.53 8871 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES PB-ALPHA DATE OF 115+/-10 M.Y. ON SAME UNIT 5 KM TO NW 3019 1 19.37 0.3 biotite conventional K-Ar SC-69-81 "4.72E-04, 0.584E-04, 1.19E-04*" 8.15 2.285 5046 initial age disturbed by later metamorphism POTASSIUM AND ARGON VALUES ARE AVERAGES AGE MAY HAVE BEEN LOWERED BY NEARBY FELSIC DIKES 3020 1 145.65 2 biotite conventional K-Ar SC-69-87 "4.72E-04, 0.584E-04, 1.19E-04*" 8.16 17.82 7492 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3021 1 207.89 4 biotite conventional K-Ar SC-69-89A "4.72E-04, 0.584E-04, 1.19E-04*" 3.6 11.42 58 minimum age of intrusion IMPURE BIOTITE CONCENTRATE POTASSIUM VALUE IS AVERAGE OF FOUR ANALYSES 3021 2 208.08 4 biotite conventional K-Ar SC-69-89B "4.72E-04, 0.584E-04, 1.19E-04*" 6.39 20.29 90 minimum age of intrusion 3021 3 218 3 hornblende conventional K-Ar SC-69-89C "4.72E-04, 0.584E-04, 1.19E-04" 0.596 6461 age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3022 1 62.8 0.9 biotite conventional K-Ar SC-69-153 "4.72E-04, 0.584E-04, 1.19E-04*" 9.2 8.464 8077 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3023 1 76.63 1.5 biotite conventional K-Ar SC-69-154 "4.72E-04, 0.584E-04, 1.19E-04*" 8.935 10.07 84 "minimum age of intrusion, may denote delayed cooling" 3024 1 78.85 1.5 biotite conventional K-Ar SC-69-155 "4.72E-04, 0.584E-04, 1.19E-04*" 8.85 10.27 81 initial age disturbed by later metamorphism 3024 2 90.23 1.4 hornblende conventional K-Ar SC-69-155 "4.72E-04, 0.584E-04, 1.19E-04*" 0.825 1.099 5266 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3025 1 77.34 1.5 biotite conventional K-Ar SC-69-156 "4.72E-04, 0.584E-04, 1.19E-04*" 8.53 9.705 73 initial age disturbed by later metamorphism 3026 1 80.44 1.6 biotite conventional K-Ar SC-69-157 "4.72E-04, 0.584E-04, 1.19E-04*" 8.95 10.6 83 minimum age of intrusion 3027 1 77.36 1.1 biotite conventional K-Ar SC-69-158 "4.72E-04, 0.584E-04, 1.19E-04*" 9.13 10.39 7471 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3028 1 72.7 1 biotite conventional K-Ar SC-69-159 "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 9.335 7778 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3028 2 72.19 2 hornblende conventional K-Ar SC-69-159 "4.72E-04, 0.584E-04, 1.19E-04*" 0.828 0.878 2226 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3029 1 91.1 1.3 biotite conventional K-Ar SC-69-161 "4.72E-04, 0.584E-04, 1.19E-04*" 8.63 11.61 8685 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3030 1 73.13 1 biotite conventional K-Ar SC-69-162 "4.72E-04, 0.584E-04, 1.19E-04*" 8.81 9.466 82 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3031 1 76.73 1.5 biotite conventional K-Ar SC-69-163 "4.72E-04, 0.584E-04, 1.19E-04*" 8.41 9.491 84 initial age disturbed by later metamorphism +40-60 MESH POTASSIUM VALUE IS AVERAGE OF THREE ANALYSES 3031 2 75.88 1.5 biotite conventional K-Ar SC-69-163 "4.72E-04, 0.584E-04, 1.19E-04*" 7.435 8.295 78 initial age disturbed by later metamorphism -60+100 MESH 3031 3 93.09 1.3 muscovite conventional K-Ar SC-69-163 "4.72E-04, 0.584E-04, 1.19E-04*" 10.15 13.96 7679 minimum age of intrusion POTASSIUM AND ARGON VALUES ARE AVERAGES 3032 1 59.56 0.9 muscovite conventional K-Ar YAG 757 "4.72E-04, 0.584E-04, 1.19E-04*" 10.71 9.337 8982 age not evaluated POTASSIUM AND ARGON VALUES ARE AVERAGES 3033 1 140.63 3 biotite conventional K-Ar YAG 758 "4.72E-04, 0.584E-04, 1.19E-04*" 8.52 17.94 89 minimum age of intrusion 6% CHLORITE 3034 1 148.23 3 biotite conventional K-Ar YAG 760 "4.72E-04, 0.584E-04, 1.19E-04*" 7.36 16.37 92 minimum age of intrusion "6% CHLORITE, 5% HORNBLENDE" 3035 1 83.51 1.6 biotite conventional K-Ar YAG 762 "4.72E-04, 0.584E-04, 1.19E-04*" 8.63 10.62 84 "minimum age of intrusion, initial age disturbed by later metamorphism" 5% CHLORITE 3036 1 143.91 3 biotite - hornblende conventional K-Ar YAG 88 "4.72E-04, 0.584E-04, 1.19E-04*" 3.31 7.139 82 minimum age of intrusion 10% CHLORITE PRESENT 3037 1 146.14 3 biotite conventional K-Ar YAG 178 "4.72E-04, 0.584E-04, 1.19E-04*" 7.52 16.48 92 minimum age of intrusion 7% CHLORITE PRESENT POTASSIUM AND ARGON VALUES ARE AVERAGES 3038 1 168.66 6 hornblende conventional K-Ar HQM-3 "4.905E-04, 0.575E-04, 1.18E-04*" 0.475 1.209 72 age of intrusion 3038 2 166.02 6 biotite conventional K-Ar HQM-3 "4.905E-04, 0.575E-04, 1.18E-04*" 8.12 20.33 81 minimum age of intrusion 3039 1 165.21 5 hornblende conventional K-Ar JMP-4 "4.905E-04, 0.575E-04, 1.18E-04*" 1.2 2.989 86 age of intrusion 3039 2 131.76 5 biotite conventional K-Ar JMP-4 "4.905E-04, 0.575E-04, 1.18E-04*" 8.44 16.61 86 INITIAL AGE DISTURBED BY YOUNGER PLUTONS 3040 1 139.96 6 biotite conventional K-Ar GRB-1 "4.905E-04, 0.575E-04, 1.18E-04*" 8.3 17.39 88 age of intrusion 3041 1 138.67 5 hornblende conventional K-Ar ASM-5 "4.905E-04, 0.575E-04, 1.18E-04*" 1.05 2.179 76 age of intrusion 3041 2 108.09 4 biotite conventional K-Ar ASM-5 "4.905E-04, 0.575E-04, 1.18E-04*" 8.05 12.91 82 AGE MAY BE RELATED TO YOUNGER ALTERATION 3042 1 95.9 3.3 biotite conventional K-Ar 02313B "4.72E-04, 0.585E-04, 1.19E-04" 12.83 94 age of intrusion 3043 1 49.9 1.7 biotite conventional K-Ar D2314B "4.72E-04, 0.585E-04, 1.19E-04" 5.557 94 age of volcanism 3044 1 92.9 3.3 muscovite conventional K-Ar D2340M "4.72E-04, 0.585E-04, 1.19E-04" 7.616 91 X-RAY DIFFRACTOGRAM SHOWED ONLY MINOR QUARTZ PRESENT IN THE SERICITE "SODIUM OXIDE CONTENT IS 0.88%, 0.83%" PROBABLE AGE OF MINERALIZATION 3045 1 1.96 0.06 whole rock conventional K-Ar BASALT 75-5-19-3 "4.72E-04, 0.584E-04, 1.19E-04" 3.2 19 age of volcanism LATITE WHOLE-ROCK NO ARGON VALUE GIVEN 3046 1 2.6 0.4 whole rock conventional K-Ar BASALT 74-11-12-1 "4.72E-04, 0.585E-04, 1.19E-04" 0.98 14 age of volcanism NO ARGON VALUE GIVEN 3047 1 2.78 0.44 whole rock conventional K-Ar BASALT 72S6 "4.72E-04, 0.584E-04, 1.19E-04" 0.42 7 age of volcanism NO ARGON VALUE GIVEN 3048 1 5.11 0.84 whole rock conventional K-Ar BASALT 72S9 "4.72E-04, 0.584E-04, 1.19E-04" 2.03 24 age of volcanism NO ARGON VALUE GIVEN 3049 1 0.14 0.04 whole rock conventional K-Ar UAKA-75-81 "4.905E-04, 0.575E-04, 1.18E-04*" 0.946 0.002 5 age of volcanism ARGON VALUE IS AVERAGE OF DUPLICATE RUNS. 3050 1 2.8 0.12 whole rock conventional K-Ar UAKA-75-82 "4.905E-04, 0.575E-04, 1.18E-04*" 1.03 0.0416 25 age of volcanism ARGON VALUE IS AVERAGE OF DUPLICATE RUNS 3136 1 31.95 0.9 muscovite conventional K-Ar RM-1-66 "4.76E-04, 0.589E-04, 1.18E-04*" 10.6 4.92 85 "age meaning uncertain (geologic factors), initial age disturbed by later metamorphism" COARSE-GRAINED 3137 1 2.59 0.09 whole rock conventional K-Ar UAKA-75-83 "4.905E-04, 0.575E-04, 1.18E-04*" 0.617 0.023 36 age of volcanism ARGON VALUE IS AVERAGE OF DUPLICATE RUNS 3157 1 37 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE MAY BE THE SAME AS QUOTED BY E.F. COOK (1960) (GUIDEBOOK OF EASTERN NEVADA). 3158 1 biotite conventional K-Ar (NOT GIVEN) no decay constants given maximum age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE REPORTED AS 23 M.Y. IN SCHILLING (1965) 3159 1 34 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 3171 1 23 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN THIS ANALYSIS MADE IN 1962 3172 1 27 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN THIS ANALYSIS MADE IN 1962 3173 1 1439.57 biotite conventional K-Ar YAG-31 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 274 94 age of metamorphic crystallization PURE CONCENTRATE "7.20, 7.14% K; ANALYTICAL ERROR IS +200 AND -70 M.Y." 3173 2 1300.41 biotite conventional K-Ar YAG-31 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 237 98 age of metamorphic crystallization "7.20, 7.14% K; ANALYTICAL ERROR IS +200 AND -70 M.Y." 3174 1 64.47 muscovite conventional K-Ar YAG-187 "4.72E-04, 0.585E-04, 1.19E-04*" 9.63 9.1 75 minimum age of intrusion ALMOST PURE "8.01, 7.97% K; ANALYTICAL ERROR IS +10 AND -3 M.Y." A PB-ALPHA AGE OF 225 M.Y. REPORTED BY ADAIR AND STRINGHAM (1960) 3178 1 39.9 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3179 1 16.8 0.5 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3180 1 85.85 3.5 biotite conventional K-Ar AD-7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 11 75 age of intrusion FRESH REPLICATE POTASSIUM ANALYSES 3181 1 90.14 1 biotite conventional K-Ar AD-4 "4.72E-04, 0.585E-04, 1.19E-04*" 7.74 10.3 67 age of intrusion FRESH REPLICATE ANALYSES OF POTASSIUM AND ARGON 3182 1 32.33 3 biotite conventional K-Ar AD-2 "4.72E-04, 0.585E-04, 1.19E-04*" 3.3 1.55 7783 minimum age of intrusion PARTIALLY ALTERED TO CHLORITE REPLICATE ANALYSES OF POTASSIUM AND ARGON 3183 1 67.35 4 biotite conventional K-Ar AD-6 "4.72E-04, 0.585E-04, 1.19E-04*" 6.68 6.6 947 minimum age of intrusion SLIGHTLY ALTERED REPLICATE ANALYSES OF POTASSIUM AND ARGON 3184 1 77.92 2 biotite conventional K-Ar AD-3 "4.72E-04, 0.585E-04, 1.19E-04*" 3.21 3.68 6162 age of intrusion FRESH REPLICATE ANALYSES OF POTASSIUM AND ARGON 3185 1 81.7 2 biotite conventional K-Ar AD-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.59 7.93 5056 age of intrusion FRESH REPLICATE ANALYSES OF POTASSIUM AND ARGON 3186 1 12 2 biotite conventional K-Ar 19 "4.72E-04, 0.583E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN; ANALYTICAL ERROR LISTED AS 20 M.Y.--THIS SHOULD PROBABLY BE 2.0 M.Y.--COMPILER 3188 1 70.54 1.8 biotite conventional K-Ar 58(AD-8) "4.72E-04, 0.585E-04, 1.19E-04*" 6.74 6.98 54 age of intrusion 3189 1 152.45 3 biotite conventional K-Ar 67 "4.72E-04, 0.585E-04, 1.19E-04*" 7.03 16.1 86 age of intrusion "GREATER THAN 50 MESH, TITANOBIOTITE" 3190 1 123 12 orthoclase conventional K-Ar 77 "4.72E-04, 0.583E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3191 1 41 5 Unk conventional K-Ar 79 "4.72E-04, 0.583E-04" NO ANALYTICAL DATA GIVEN A RECONNAISSANCE AGE; LITTLE INFORMATION GIVEN ABOUT THE SAMPLE 3192 1 90.4 1 biotite conventional K-Ar 90 "4.72E-04, 0.583E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3193 1 35.2 1 biotite conventional K-Ar 93 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism "-40+80 MESH, OVER 95% PURE" NO ANALYTICAL DATA GIVEN "THIS AGE CITED BY AXELROD (1964) AS ""ABOUT 36 M.Y. "" ON PAGE 77." 3194 1 39 1 biotite conventional K-Ar 94A "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism -20+80 MESH NO ANALYTICAL DATA GIVEN 3194 2 40 1 sanidine conventional K-Ar 94B "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism -20+80 MESH NO ANALYTICAL DATA GIVEN 3195 1 28.13 2 biotite conventional K-Ar 1-SW193 "4.72E-04, 0.584E-04, 1.19E-04*" 8.33 3.4 69 age of intrusion 99% BIOTITE; +80 MESH GRAIN SIZE REPLICATE ANALYSES; ANALYTICAL DATA NOT PUBLISHED 3196 1 151 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3197 1 32.26 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.56 4.48 59 McKee and others (1971) age of volcanism "ANALYTICAL DATA FROM MCKEE AND OTHERS, 1971, ISOCHRON/WEST, P. 41, NO. 143" 3198 1 37.72 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8 4.39 69 McKee and others (1971) age of volcanism "ANALYTICAL DATA OBTAINED FROM MCKEE AND OTHERS, 1971, P. 41, NO. 144" 3199 1 1384.46 140 muscovite conventional K-Ar (NOT GIVEN) no decay constants given* 8.94 268 minimum age of intrusion ANALYTICAL DATA NOT PUBLISHED 3200 1 13.6 0.5 whole rock conventional K-Ar PED-10-65 "4.76E-04, 0.589E-04, 1.21E-04*" 2.2 0.431 70 age of volcanism 3201 1 32.26 3 biotite conventional K-Ar 63W192 "4.72E-04, 0.585E-04, 1.19E-04*" 7.32 3.43 82 age of intrusion 3202 1 37.1 4 biotite conventional K-Ar 63W193 "4.72E-04, 0.585E-04, 1.19E-04*" 7.93 4.28 81 age of intrusion 3203 1 29.63 3 biotite conventional K-Ar 63W194 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 3.75 72 age of intrusion 3204 1 31.59 3 biotite conventional K-Ar 63W195 "4.72E-04, 0.585E-04, 1.19E-04*" 9.22 4.23 78 age of intrusion 3208 1 39.16 4 biotite conventional K-Ar 60D414 "4.72E-04, 0.585E-04, 1.19E-04*" 9.08 5.175 85 age of volcanism "ANALYTICAL DATA IS FROM MCKEE AND MARVIN, 1976." 3209 1 37.21 4 biotite conventional K-Ar 59D320 "4.72E-04, 0.585E-04, 1.19E-04*" 5.45 2.95 86 age of volcanism "ANALYTICAL DATA TAKEN FROM MCKEE AND MARVIN, 1976." 3211 1 13.41 0.5 glass conventional K-Ar D-1053G "4.72E-04, 0.585E-04, 1.19E-04*" 4.66 0.9029 93 age of volcanism NONHYDRATED GLASS 3212 1 14.13 0.5 glass conventional K-Ar D-1048G "4.72E-04, 0.585E-04, 1.19E-04*" 4.54 0.9272 69 age of volcanism NONHYDRATED GLASS 3213 1 15.17 0.6 sanidine conventional K-Ar D-1051S "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 1.726 95 age of volcanism 3214 1 14.36 0.6 sanidine conventional K-Ar D-1052S "4.72E-04, 0.584E-04, 1.19E-04*" 6.93 1.438 89 age of volcanism 3215 1 19.5 0.6 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3216 1 50.6 1.5 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3217 1 42.1 1.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3218 1 83 4 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 3219 1 6.2 0.2 sanidine conventional K-Ar N80A-S "4.72E-04, 0.584E-04, 1.19E-04" 6.19 77 age of volcanism 3220 1 7.5 0.2 sanidine conventional K-Ar AGE 11-S "4.72E-04, 0.584E-04, 1.19E-04" 6.61 75 age of volcanism "AGE (ONLY THE AGE) ALSO PUBLISHED BY NOBLE, ANDERSON, AND O'CONNOR, 1964, U.S. GEOL. SURVEY PROF. PAPER 475-D, P. D25" 3221 1 9.4 2 biotite conventional K-Ar AGE 19-B "4.72E-04, 0.584E-04, 1.19E-04" 8.15 11 age of volcanism 3221 2 9.6 0.3 sanidine conventional K-Ar AGE 19-S "4.72E-04, 0.584E-04, 1.19E-04" 6.21 85 age of volcanism 3222 1 10.9 0.4 biotite conventional K-Ar AGE 17-B "4.72E-04, 0.584E-04, 1.19E-04" 8.02 64 age of volcanism 3223 1 10.8 0.3 sanidine conventional K-Ar AGE 16-S "4.72E-04, 0.584E-04, 1.19E-04" 5.9 70 age of volcanism -80+100 MESH 3223 2 10.8 0.5 sanidine conventional K-Ar AGE 16-S "4.72E-04, 0.584E-04, 1.19E-04" 7.18 40 age of volcanism -60+80 MESH 3224 1 11.2 0.5 biotite conventional K-Ar AGE 12-B "4.72E-04, 0.584E-04, 1.19E-04" 7.56 43 age of volcanism 3225 1 11.4 0.5 biotite conventional K-Ar AGE 20-B "4.72E-04, 0.584E-04, 1.19E-04" 7.93 43 age of volcanism 3226 1 12.1 0.5 biotite conventional K-Ar AGE 5-B "4.72E-04, 0.584E-04, 1.19E-04" 7.43 56 age of volcanism 6.19% AND 6.15% K 3227 1 11 0.4 biotite conventional K-Ar AGE 18-B "4.72E-04, 0.584E-04, 1.19E-04" 7.77 57 age of volcanism 3227 2 11.2 0.3 sanidine conventional K-Ar AGE 18-S "4.72E-04, 0.584E-04, 1.19E-04" 6.84 78 age of volcanism 3228 1 10.5 0.3 sanidine conventional K-Ar WJC 138-S "4.72E-04, 0.584E-04, 1.19E-04" 6.71 71 age of volcanism 3229 1 10.8 0.5 biotite conventional K-Ar AGE 7-B "4.72E-04, 0.584E-04, 1.19E-04" 7.6 45 age of volcanism 3229 2 10.9 0.5 biotite conventional K-Ar AGE 7-B "4.72E-04, 0.584E-04, 1.19E-04" 7.6 44 age of volcanism "AGE (ONLY THE AGE) ALSO PUBLISHED BY LUFT, 1964, U.S. GEOL. SURVEY PROF. PAPER 501-D, P. D15" 3229 3 10.6 0.3 sanidine conventional K-Ar AGE 7-S "4.72E-04, 0.584E-04, 1.19E-04" 6.41 66 age of volcanism 3229 4 10.9 0.4 sanidine conventional K-Ar AGE 7-S "4.72E-04, 0.584E-04, 1.19E-04" 6.41 68 age of volcanism "AGE (ONLY THE AGE) ALSO PUBLISHED BY LUFT, 1964, U.S. GEOL. SURVEY PROF. PAPER 501-D, P. D15" 3230 1 11.1 0.3 sanidine conventional K-Ar AGE 22-S "4.72E-04, 0.584E-04, 1.19E-04" 7.19 75 age of volcanism 3231 1 11.7 0.4 biotite conventional K-Ar AGE 23-B "4.72E-04, 0.584E-04, 1.19E-04" 7.6 51 age of volcanism 3231 2 11.1 0.3 sanidine conventional K-Ar AGE 23-S "4.72E-04, 0.584E-04, 1.19E-04" 5.86 70 age of volcanism -100+115 MESH 3231 3 11.4 0.4 sanidine conventional K-Ar AGE 23-S "4.72E-04, 0.584E-04, 1.19E-04" 6.01 74 age of volcanism -80+100 MESH 3232 1 10.4 0.3 sanidine conventional K-Ar AGE 15-S "4.72E-04, 0.584E-04, 1.19E-04" 9.12 91 age of volcanism 3233 1 11.3 0.4 biotite conventional K-Ar MC-336-B "4.72E-04, 0.584E-04, 1.19E-04" 8.81 64 age of volcanism 3234 1 12.4 0.5 biotite conventional K-Ar AGE 4-B "4.72E-04, 0.584E-04, 1.19E-04" 7.64 55 age of volcanism 3235 1 12.4 0.4 biotite conventional K-Ar BC-308-B "4.72E-04, 0.584E-04, 1.19E-04" 8.15 64 age of volcanism 3236 1 13.2 0.4 biotite conventional K-Ar AGE 2A-B "4.72E-04, 0.584E-04, 1.19E-04" 7.62 65 age of volcanism "AGE (ONLY THE AGE) ALSO PUBLISHED BY LIPMAN, CHRISTIANSEN, AND O'CONNOR, 1966, U.S. GEOL. SURVEY PROF. PAPER 524-F, P. F3" 3237 1 12.5 0.4 biotite conventional K-Ar AGE 9-B "4.72E-04, 0.584E-04, 1.19E-04" 5.21 63 age of volcanism 3238 1 12.9 0.4 biotite conventional K-Ar AGE 8-B "4.72E-04, 0.584E-04, 1.19E-04" 7.65 69 age of volcanism 3239 1 13.4 0.4 biotite conventional K-Ar AGE 3-B "4.72E-04, 0.584E-04, 1.19E-04" 7.64 68 age of volcanism 3240 1 13.6 0.4 sanidine conventional K-Ar AGE 13-S "4.72E-04, 0.584E-04, 1.19E-04" 9.15 77 age of volcanism 3241 1 16.1 0.4 biotite conventional K-Ar AGE 6-B "4.72E-04, 0.584E-04, 1.19E-04" 8.09 76 age of volcanism 3242 1 15 0.6 biotite conventional K-Ar AGE 24-B "4.72E-04, 0.584E-04, 1.19E-04" 6.76 50 age of volcanism 3243 1 17.8 0.5 biotite conventional K-Ar AGE 25-B "4.72E-04, 0.584E-04, 1.19E-04" 8.58 88 age of volcanism 3244 1 21.1 0.6 biotite conventional K-Ar 438-6-B "4.72E-04, 0.584E-04, 1.19E-04" 8.15 71 age of volcanism 3244 2 21.9 0.4 sanidine conventional K-Ar 438-6-S "4.72E-04, 0.584E-04, 1.19E-04" 10.6 95 age of volcanism 3245 1 25.3 0.7 biotite conventional K-Ar 163-3-B "4.72E-04, 0.584E-04, 1.19E-04" 8.24 75 age of volcanism 3246 1 26.1 0.7 biotite conventional K-Ar AGE 26-B "4.72E-04, 0.584E-04, 1.19E-04" 8.6 85 age of volcanism 3247 1 124.23 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 4.38 8.11 7886 age of intrusion REPLICATE ANALYSES OF POTASSIUM AND ARGON 3248 1 11.2 1.1 whole rock conventional K-Ar PED-5-66 "4.78E-04, 0.588E-04, 1.21E-04*" 8.93 1.44 19 age of intrusion 3249 1 28.5 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 3250 1 27 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 3251 1 12.2 0.8 sanidine conventional K-Ar 62NC51 "4.72E-04, 0.584E-04, 1.19E-04" 5.26 31 age of volcanism AR40/K40 = 7.13 E-4 3252 1 11.6 0.5 sanidine conventional K-Ar 61NC119 "4.72E-04, 0.584E-04, 1.19E-04" 8.95 78 age of volcanism AR40/K40 = 6.79 E-4 3253 1 31.66 1.6 biotite conventional K-Ar 60-W-71 "4.76E-04, 0.589E-04, 1.18E-04*" 6.96 3.2 62 age of volcanism "UNPUBLISHED ANALYTICAL DATA FROM R.F. MARVIN, USGS" UNPUBLISHED PB-ALPHA AGE OF 50+/-15 M.Y. WAS MADE ON ZIRCONS FROM THIS SAMPLE. THE AGE IS TOO OLD. 3254 1 34 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3255 1 34 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3256 1 155.36 0.05 whole rock conventional K-Ar KA 1209 no decay constants given* 0.905 2.114 23 age of volcanism "THE ANALYTICAL DATA TAKEN FROM MCKEE AND MARVIN, 1974" 3257 1 165 5 hornblende conventional K-Ar (NOT GIVEN) no decay constants given 0.47 42 age of intrusion 32-80 MESH; 2% ACTINOLITE CONTAMINANT "UNPUBLISHED ANALYTICAL DATA FROM FILES OF J.H. SCHILLING, NEVADA BUREAU OF MINES" 3257 2 145 5 biotite conventional K-Ar (NOT GIVEN) no decay constants given 5.15 72 minimum age of intrusion "32-80 MESH, 1% CHLORITE CONTAMINANT" "UNPUBLISHED ANALYTICAL DATA FROM THE FILES OF J.H. SCHILLING, NEVADA BUREAU OF MINES" 3258 1 150 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 3259 1 22.73 0.9 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.17 2.69 67 age of volcanism 3260 1 23.36 0.9 sanidine conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.77 2.63 54 age of volcanism 3261 1 24.32 1 sanidine conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 10.47 3.69 84 age of volcanism 3262 1 25.06 1 sanidine conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 11.7 4.25 87 age of volcanism 3263 1 25.74 1 sanidine conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 11.36 4.24 81 age of volcanism 3264 1 31.38 1.2 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 3.5 71 age of volcanism 3265 1 89.33 2.6 biotite conventional K-Ar AD-9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.95 11.8 age of intrusion REPLICATE ANALYSES OF POTASSIUM AND TRIPLICATE ANALYSES OF ARGON 3266 1 32.3 1.2 biotite conventional K-Ar AD-10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.46 3.97 5661 age of volcanism REPLICATE ANALYSES OF POTASSIUM AND ARGON 3267 1 13.26 0.8 plagioclase conventional K-Ar AD-12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.741 0.142 4555 age of volcanism REPLICATE ANALYSES OF POTASSIUM AND ARGON 3268 1 13.02 0.6 adularia conventional K-Ar AD-14 "4.72E-04, 0.585E-04, 1.19E-04*" 2.19 0.412 2839 SOME QUARTZ PRESENT REPLICATE ANALYSES OF POTASSIUM AND ARGON APPARENT AGE OF MINERALIZATION 3269 1 14.71 1.5 whole rock conventional K-Ar AD-15 "4.72E-04, 0.585E-04, 1.19E-04*" 1.274 0.271 4946 age of volcanism REPLICATE ANALYSES OF ARGON 3270 1 15.5 2.4 plagioclase conventional K-Ar AD-16 "4.72E-04, 0.585E-04, 1.19E-04*" 0.345 0.0776 55 age of volcanism REPLICATE ANALYSES OF POTASSIUM 3271 1 71 3 biotite (NOT GIVEN) no decay constants given age of intrusion "NO ANALYTICAL DATA GIVEN. THIS AGE IS REPORTED TO HAVE BEEN DETERMINED BY MARVIN, MEHNERT, AND MOUNTJOY, BUT MARVIN REPORTS HE HAS NO RECORD OF THIS AGE." 3272 1 79.6 2 biotite (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 3273 1 76 2 biotite (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 3274 1 15.55 0.5 glass conventional K-Ar NN-21B-NG "4.72E-04, 0.585E-04, 1.19E-04*" 4.52 1.016 80 age of volcanism NONHYDRATED 3275 1 15.78 0.5 glass conventional K-Ar N-13A-NG "4.72E-04, 0.585E-04, 1.19E-04*" 4.55 1.038 66 age of volcanism NONHYDRATED "RB-SR AGE OF 15 M.Y. OBTAINED FOR THIS SAMPLE BY NOBLE AND OTHERS, 1973" 3276 1 15.15 0.5 sanidine conventional K-Ar NR-11-S "4.72E-04, 0.585E-04, 1.19E-04*" 7.54 1.651 13 age of volcanism 3277 1 15.5 0.5 sanidine conventional K-Ar N-25-S "4.72E-04, 0.585E-04, 1.19E-04*" 5.64 1.264 72 age of volcanism 3278 1 16.06 0.5 sanidine conventional K-Ar N-42-S "4.72E-04, 0.585E-04, 1.19E-04*" 6.88 1.598 53 age of volcanism "RB-SR AGE OF 15.9 M.Y. OBTAINED FOR THIS SAMPLE BY NOBLE AND OTHERS, 1973" 3279 1 25.95 0.9 sanidine conventional K-Ar N9-150-S "4.72E-04, 0.585E-04, 1.19E-04*" 5.84 2.198 60 age of volcanism 3279 2 24.27 0.7 sanidine conventional K-Ar N9-150-S "4.72E-04, 0.585E-04, 1.19E-04*" 5.84 2.054 54 age of volcanism 3280 1 24.5 0.7 sanidine conventional K-Ar N-SL-C3-S "4.72E-04, 0.585E-04, 1.19E-04*" 5.96 2.117 51 age of volcanism "RB-SR AGE OF 24.5 M.Y. OBTAINED FOR THIS SAMPLE BY NOBLE AND OTHERS, 1973" 3281 1 24.79 1 sanidine conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.18 2.94 94 age of volcanism 3282 1 32.78 1.1 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.23 3.92 48 age of volcanism AVERAGE OF 5 ZIRCON AGES IS 34.1 M.Y.; AVERAGE OF 20 FISSION-TRACK AGES IS 34.9 M.Y. FOR CAETANO TUFF 3293 1 35.23 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 4.22 80 age of intrusion REPLICATE POTASSIUM ANALYSES 3293 2 36.14 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 4.33 81 age of intrusion REPEAT AR ANALYSIS 3293 3 35.57 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 11.6 6 97 age of intrusion REPLICATE POTASSIUM ANALYSES 3294 1 38.23 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.79 4.89 78 age of intrusion POTASSIUM VALUE IS AVERAGE OF 3 ANALYSES 3294 2 38.08 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.79 4.87 55 age of intrusion REPEAT AR ANALYSIS 3295 1 38.11 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 4.43 81 age of intrusion REPLICATE POTASSIUM ANALYSES 3295 2 38.45 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 4.47 83 age of intrusion REPEAT AR ANALYSIS 3295 3 38.92 hornblende conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.077 0.61 71 age of intrusion POTASSIUM VALUE IS AVERAGE OF 8 ANALYSES 3296 1 35.97 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 7.61 3.98 71 age of intrusion REPLICATE POTASSIUM ANALYSES 3297 1 39.23 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 7.6 4.34 63 age of intrusion POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES 3297 2 37.51 hornblende conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.953 0.52 55 age of intrusion POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES 3298 1 37.92 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.25 4 38 age of intrusion REPLICATE POTASSIUM ANALYSES 3298 2 37 hornblende conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.892 0.48 63 age of intrusion POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES 3299 1 14.16 sanidine conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.77 2 76 age of volcanism REPLICATE POTASSIUM ANALYSES 3300 1 14.25 sanidine conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 10.1 2.08 74 age of volcanism REPLICATE POTASSIUM ANALYSES 3301 1 34.8 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 4.26 79 age of volcanism REPLICATE POTASSIUM ANALYSES 3302 1 34.28 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 4.31 64 age of volcanism REPLICATE POTASSIUM ANALYSES 3302 2 31.95 sanidine conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 12.13 5.63 90 age of volcanism REPLICATE POTASSIUM ANALYSES 3303 1 32.07 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.35 3.89 74 age of volcanism REPLICATE POTASSIUM ANALYSES 3303 2 31.68 sanidine conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 11.78 5.42 72 age of volcanism REPLICATE POTASSIUM ANALYSES 3304 1 34.32 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 4.18 86 age of volcanism REPLICATE POTASSIUM ANALYSES "AGE ALSO LISTED IN USGS MAP GQ-730 BY STEWART AND MCKEE, 1968" 3305 1 25.12 sanidine conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 8.95 3.26 77 age of volcanism REPLICATE POTASSIUM ANALYSES 3306 1 24.14 sanidine conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 9.46 3.31 74 age of volcanism REPLICATE POTASSIUM ANALYSES 3307 1 24.99 1 sanidine conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 9.19 3.33 94 age of volcanism REPLICATE POTASSIUM ANALYSES 3308 1 25.39 sanidine conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 10.05 3.7 96 age of volcanism REPLICATE POTASSIUM ANALYSES "AGE ALSO LISTED IN USGS MAP GQ-730 BY STEWART AND MCKEE, 1968" 3309 1 24.79 sanidine conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 8.18 2.94 94 age of volcanism REPLICATE POTASSIUM ANALYSES 3310 1 31.85 biotite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 3.83 91 age of volcanism REPLICATE POTASSIUM ANALYSES "AGE ALSO LISTED IN USGS MAP GQ-770 BY MCKEE, 1968" 3311 1 34.86 biotite conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.11 4.11 91 age of volcanism REPLICATE POTASSIUM ANALYSES "AGE ALSO LISTED IN USGS MAP GQ-730 BY STEWART AND MCKEE, 1968" 3312 1 36.35 hornblende conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 0.927 0.49 71 age of volcanism REPLICATE POTASSIUM ANALYSES "AGE ALSO LISTED IN USGS MAP GQ-770 BY MCKEE, 1968" 3313 1 35.34 biotite conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 6.5 3.34 76 age of volcanism 3314 1 10.19 whole rock conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 0.306 0.045 7 age of volcanism 3315 1 15.2 whole rock conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 0.733 0.16 36 age of volcanism 3316 1 16.8 whole rock conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 1.575 0.38 43 age of volcanism 3317 1 30.17 biotite conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 3.46 68 age of volcanism REPLICATE POTASSIUM ANALYSES 3318 1 27.02 biotite conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 4.67 1.83 67 age of volcanism REPLICATE POTASSIUM ANALYSES 3319 1 28.74 biotite conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 3.52 38 age of volcanism REPLICATE POTASSIUM ANALYSES 3320 1 7.97 0.6 glass conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 4.33 0.498 16 age of volcanism NONHYDRATED GLASS 3320 2 9.73 0.7 glass conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 4.33 0.608 17 NONHYDRATED GLASS APPEARS INCORRECT IN COMPARISON WITH AGES OF ADJACENT UNITS 3321 1 11.41 0.3 sanidine conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 10.13 1.67 93 age of volcanism -100 MESH 3321 2 11.56 0.3 sanidine conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 10.065 1.68 96 age of volcanism +100 MESH 3322 1 13 0.6 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.61 1.429 61 age of volcanism 3322 2 12.82 0.6 K feldspar conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 6.82 1.263 77 age of volcanism 3323 1 13.01 1.1 K feldspar conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 5.99 1.126 41 age of volcanism 3323 2 11.57 1.1 K feldspar conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 5.99 1.001 37 "THIS AGE APPEARS INCORRECT IN COMPARISON WITH OTHER RADIOMETRIC AGES FOR THE PAINTBRUSH TUFF, TIVA CANYON MEMBER." 3324 1 12.35 0.4 biotite conventional K-Ar 4A(011-101-1) "4.72E-04, 0.584E-04, 1.19E-04*" 7.62 1.359 4341 age of volcanism ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 3324 2 13.3 0.3 K feldspar conventional K-Ar 4A(011-101-1) "4.72E-04, 0.584E-04, 1.19E-04*" 8.13 1.562 8379 age of volcanism ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 3325 1 13.57 0.4 biotite conventional K-Ar 4A(011-101-2) "4.72E-04, 0.584E-04, 1.19E-04*" 7.55 1.481 4749 age of volcanism ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 3325 2 13.12 0.4 K feldspar conventional K-Ar 4A(011-101-2) "4.72E-04, 0.584E-04, 1.19E-04*" 8.57 1.625 7984 age of volcanism ARGON VALUE IS AVERAGE OF REPLICATE ANALYSES 3326 1 14.12 0.4 biotite conventional K-Ar 9(0B3) "4.72E-04, 0.584E-04, 1.19E-04*" 8.295 1.693 76 age of volcanism 3326 2 14.45 0.4 biotite conventional K-Ar 9(0B3) "4.72E-04, 0.584E-04, 1.19E-04*" 8.295 1.732 73 age of volcanism 3327 1 13.42 0.4 biotite conventional K-Ar 9(0B3A) "4.72E-04, 0.584E-04, 1.19E-04*" 8.38 1.625 80 age of volcanism 3327 2 13.18 0.4 biotite conventional K-Ar 9(0B3A) "4.72E-04, 0.584E-04, 1.19E-04*" 8.38 1.596 70 age of volcanism 3328 1 16.08 0.6 sanidine conventional K-Ar 9A "4.72E-04, 0.584E-04, 1.19E-04*" 9.57 2.226 92 age of volcanism REPLICATE POTASSIUM ANALYSES 3329 1 15.97 0.5 sanidine conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.19E-04*" 12.255 2.831 94 age of volcanism 3329 2 16.82 0.5 sanidine conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.19E-04*" 12.255 2.982 95 age of volcanism 3330 1 19.16 0.7 biotite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 6.85 1.9 75 age of volcanism 3330 2 17.58 0.7 biotite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 6.85 1.742 69 age of volcanism 3331 1 23.39 0.7 sanidine conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 11 3.729 98 age of volcanism 3331 2 22.17 0.7 sanidine conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 11 3.533 92 age of volcanism 3332 1 24.02 0.7 sanidine conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 11.25 3.917 94 age of volcanism 3332 2 24.35 1.1 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 7.77 2.742 69 age of volcanism 3333 1 25.01 0.7 sanidine conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 11.09 4.021 95 age of volcanism 3333 2 25.79 1.2 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.26 3.089 73 age of volcanism 3334 1 28.35 1.2 K feldspar conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 6 2.468 92 age of volcanism 3334 2 26.85 1.2 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 8.33 3.244 78 age of volcanism POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES 3335 1 28.23 0.8 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 8.435 3.455 86 age of volcanism 3335 2 27.89 0.8 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 8.435 3.413 84 age of volcanism "THE RESULTS OF THESE SAME ANALYSES ARE REPORTED AS 27.5+/-0.8 M.Y. IN EKREN AND OTHERS, 1977" 3336 1 29.01 1.3 biotite conventional K-Ar 17(TNR-4-1) "4.72E-04, 0.584E-04, 1.19E-04*" 7.82 3.292 71 age of volcanism 3337 1 29.01 1.3 biotite conventional K-Ar 17(TNR-1) "4.72E-04, 0.584E-04, 1.19E-04*" 7.82 3.292 71 age of volcanism 3337 2 31.6 1.4 biotite conventional K-Ar 17(TNR-1) "4.72E-04, 0.584E-04, 1.19E-04*" 8.12 3.727 79 age of volcanism 3338 1 31.49 1.4 biotite conventional K-Ar 18(NS-2-4) "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 3.924 80 age of volcanism 3339 1 30.56 1.4 biotite conventional K-Ar 18(NS-2-1) "4.72E-04, 0.584E-04, 1.19E-04*" 8.45 3.749 74 age of volcanism 3340 1 30.09 1.4 biotite conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 7.7 3.364 70 age of volcanism 3341 1 93.88 3.3 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 12.32 92 age of intrusion 3344 1 99.53 5 biotite conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 12.64 94 age of intrusion AVERAGE OF SIX K-AR AGES IS 93 M.Y. 3345 1 97.47 5 biotite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 8.26 11.91 91 age of intrusion AVERAGE OF SIX K-AR AGES IS 93 M.Y. 3346 1 90.75 4 biotite conventional K-Ar 23 "4.72E-04, 0.584E-04, 1.19E-04*" 8.03 10.76 87 minimum age of intrusion AVERAGE OF SIX K-AR AGES IS 93 M.Y. 3347 1 93.05 5 biotite conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04*" 8.86 12.18 91 age of intrusion AVERAGE OF SIX K-AR AGES IS 93 M.Y. 3348 1 93 5 biotite conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 8.45 11.61 90 age of intrusion AVERAGE OF SIX K-AR AGES IS 93 M.Y. 3349 1 96.6 5 biotite conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04*" 6.97 9.958 85 age of intrusion AVERAGE OF SIX K-AR AGES IS 93 M.Y. 3350 1 75.21 4 biotite conventional K-Ar 16-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 9.83 91 -150 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3350 2 80.36 4 muscovite conventional K-Ar 16-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 9.63 96 -150 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3351 1 96.71 4.2 biotite conventional K-Ar 27-DL-61 "4.72E-04, 0.585E-04, 1.19E-04*" 9.48 13.56 93 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3351 2 101.58 4.2 biotite conventional K-Ar 27-DL-61 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 13.75 95 -80+100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3351 3 159.09 5 hornblende conventional K-Ar 27-DL-61 "4.72E-04, 0.585E-04, 1.19E-04*" 0.73 1.748 86 age of metamorphic crystallization -100 MESH 3352 1 43.36 1.4 microcline conventional K-Ar 40A-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 14.7 9.287 89 -150 MESH "REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS. U-TH-PB AGES OF 153, 162, AND 175 M.Y. REPORTED FOR THIS SAMPLE BY LEE AND OTHERS (1968)" 3352 2 72.88 3.1 biotite conventional K-Ar 40A-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 9.519 87 "REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS. U-TH-PB AGES OF 153, 162, AND 175 M.Y. REPORTED FOR THIS SAMPLE BY LEE AND OTHERS (1968)" 3353 1 83.64 3.4 biotite conventional K-Ar 40B-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.59 11.82 94 -60+150 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3353 2 85.98 3.5 biotite conventional K-Ar 40B-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 10.98 90 +60 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3354 1 120.88 5 biotite conventional K-Ar 22-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 8 14.4 98 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3354 2 143.17 6 muscovite conventional K-Ar 22-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.5 20.38 96 minimum age of intrusion -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3355 1 142.89 5 muscovite conventional K-Ar 389-DL-67 "4.72E-04, 0.585E-04, 1.19E-04*" 9.3 19.91 90 minimum age of intrusion +60 MESH AGE OF MINERALIZATION(?) OR A REDUCED AGE DUE TO THERMAL STRESS DURING THRUST FAULTING 3356 1 73.86 2.2 muscovite conventional K-Ar 396-DL-67 "4.72E-04, 0.585E-04, 1.19E-04*" 10.88 11.81 94 +60 MESH MINIMUM AGE OF MINERALIZATION OR REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3357 1 133.45 6 muscovite conventional K-Ar 62-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 10.08 20.1 98 minimum age of intrusion -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3358 1 145.23 4 muscovite conventional K-Ar 195-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 10.38 22.6 94 -50+100 MESH MINIMUM AGE OF MINERALIZATION. REDUCED AGE DUE TO LOSS OF ARGON DURING THERMAL STRESS DUE TO THRUST FAULTING 3359 1 159.27 6 muscovite conventional K-Ar 392-DL-67 "4.72E-04, 0.585E-04, 1.19E-04*" 9.44 22.63 90 +60 MESH AGE OF MINERALIZATION OR A REDUCED AGE DUE TO LOSS OF ARGON DURING THERMAL STRESS DUE TO THRUST FAULTING 3360 1 96.59 5 biotite conventional K-Ar 71-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.03 12.9 89 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3361 1 31.7 2 muscovite conventional K-Ar 121-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 10.1 4.65 82 minimum age of intrusion -100 MESH 3362 1 33.31 1.4 biotite conventional K-Ar 122-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 4.424 84 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON; PRIMARY AGE IS PROBABLY JURASSIC 3362 2 53.09 1.5 muscovite conventional K-Ar 122-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 10.3 7.989 88 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3363 1 23.1 1.3 biotite conventional K-Ar 135-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 2.919 50 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3363 2 72.68 2 muscovite conventional K-Ar 135-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 10.48 11.19 92 age of volcanism -100 MESH 3364 1 55.17 1.5 muscovite conventional K-Ar 199-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 10.77 8.687 94 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3365 1 31.58 2.1 biotite conventional K-Ar 226-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 7.32 3.357 38 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3365 2 79.51 2.2 muscovite conventional K-Ar 226-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 10.1 11.82 90 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3366 1 34.85 1 muscovite conventional K-Ar 119-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 10.06 5.096 82 age of intrusion -100 MESH 3367 1 23.1 1.3 biotite conventional K-Ar 98-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 2.848 66 age of metamorphic crystallization +100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3368 1 17.4 0.8 muscovite conventional K-Ar 184-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 3.62 0.9112 80 age of later metamorphism ALSO CONTAINS QUARTZ; -100 MESH THERMAL METAMORPHISM; REDUCED AGE DUE TO LOSS OF ARGON; PRIMARY AGE IS PROBABLY JURASSIC 3369 1 31.61 1.5 biotite conventional K-Ar 126-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 3.912 84 +100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3370 1 19.01 1 muscovite conventional K-Ar 188-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 6.14 1.689 86 age of later metamorphism ALSO CONTAINS QUARTZ; -100 MESH THERMAL METAMORPHISM; REDUCED AGE DUE TO LOSS OF ARGON 3371 1 30.61 1.4 biotite conventional K-Ar 230-MW-61 "4.72E-04, 0.585E-04, 1.19E-04*" 8.92 3.964 73 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON DURING THRUST FAULTING 3372 1 51.16 2 phlogopite conventional K-Ar 224-DL-63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.54 7.127 83 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3373 1 77.9 2.9 biotite conventional K-Ar 177-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.04 10.36 89 +100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3374 1 77.22 2.9 biotite conventional K-Ar 371-DL-66 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 9.632 84 +60 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3375 1 105.84 4 biotite conventional K-Ar 334-DL-66 "4.72E-04, 0.585E-04, 1.19E-04*" 9.22 14.47 91 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3375 2 115.87 4 muscovite conventional K-Ar 334-DL-66 "4.72E-04, 0.585E-04, 1.19E-04*" 9.24 15.92 90 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3376 1 123.34 4 biotite conventional K-Ar 295-DL-64 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 16.1 96 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3376 2 153.82 4 muscovite conventional K-Ar 295-DL-64 "4.72E-04, 0.585E-04, 1.19E-04*" 10.01 23.14 85 minimum age of intrusion -100 MESH 3377 1 26.09 1.3 biotite conventional K-Ar 287-DL-63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.28 3.511 75 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3377 2 31.82 1.7 muscovite conventional K-Ar 287-DL-63 "4.72E-04, 0.585E-04, 1.19E-04*" 10.38 4.798 47 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3378 1 22.68 1.3 phengite conventional K-Ar 419-DL-67 "4.72E-04, 0.585E-04, 1.19E-04*" 10.58 3.476 61 +80 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS DURING THRUST FAULTING 3379 1 25.31 1.7 muscovite conventional K-Ar 250-DL-63 "4.72E-04, 0.585E-04, 1.19E-04*" 7.76 2.848 47 ALSO CONTAINS SOME QUARTZ; -60 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3380 1 25.8 1.2 biotite conventional K-Ar 418-DL-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 3.274 55 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS DURING THRUST FAULTING 3380 2 55.42 1.5 phengite conventional K-Ar 418-DL-67 "4.72E-04, 0.585E-04, 1.19E-04*" 10.66 8.637 91 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS DURING THRUST FAULTING 3381 1 61.43 3 biotite conventional K-Ar 35A-MW-60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.87 8.88 93 -60 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS DURING THRUST FAULTING 3382 1 62.65 1.8 phengite conventional K-Ar 146-DL-62 "4.72E-04, 0.585E-04, 1.19E-04*" 10.8 9.912 91 -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3383 1 66.19 1.8 phengite conventional K-Ar 380-DL-66 "4.72E-04, 0.585E-04, 1.19E-04*" 10.91 10.59 91 -100 MESH REDUCED AGE 3384 1 125.44 5 muscovite conventional K-Ar 330-DL-66 "4.72E-04, 0.585E-04, 1.19E-04*" 7.32 13.69 94 ALSO CONTAINS QUARTZ; -100 MESH REDUCED AGE DUE TO LOSS OF ARGON FROM THERMAL STRESS 3385 1 264.49 9 muscovite conventional K-Ar 329-DL-66 "4.72E-04, 0.585E-04, 1.19E-04*" 6.92 28.38 96 age of volcanism ALSO CONTAINS SOME QUARTZ; -100 MESH 3393 1 93.86 1.8 sericite conventional K-Ar JDL-1-69 "4.76E-04, 0.589E-04, 1.18E-04*" 9.3 12.9 93 MINIMUM AGE OF ALTERATION 3394 1 69.75 1.7 microcline conventional K-Ar JDL-1-70 "4.76E-04, 0.589E-04, 1.18E-04*" 13 13.31 86 AGE IS PROBABLY SPURIOUS; MICROCLINE PROBABLY LEAKED RADIOGENIC ARGON 3395 1 97.36 2.4 sericite conventional K-Ar JDL-2-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.11 11.68 92 PROBABLE AGE OF ALTERATION; MAY BE CLOSE TO AGE OF CRYSTALLIZATION 3397 1 153.11 5 hornblende conventional K-Ar W-307 "4.72E-04, 0.585E-04, 1.19E-04*" 0.539 1.24 90 maximum age of intrusion 3398 1 35.27 1.2 biotite conventional K-Ar J-250 "4.72E-04, 0.585E-04, 1.19E-04*" 8.56 4.39 81 age of intrusion 3398 2 35.11 1.1 sanidine conventional K-Ar J-250 "4.72E-04, 0.585E-04, 1.19E-04*" 10.62 5.42 96 age of intrusion 3399 1 34.77 1.1 biotite conventional K-Ar J-259 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 4.17 82 age of intrusion 3399 2 35.78 1.2 sanidine conventional K-Ar J-259 "4.72E-04, 0.585E-04, 1.19E-04*" 12.34 6.42 95 age of intrusion 3400 1 35.82 1 biotite conventional K-Ar J-269 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 4.37 85 age of intrusion 3400 2 35.31 1.1 sanidine conventional K-Ar J-269 "4.72E-04, 0.585E-04, 1.19E-04*" 10.52 5.4 92 age of intrusion 3401 1 35.25 1.1 biotite conventional K-Ar J-272 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 4.29 80 age of volcanism 3401 2 33.45 1 sanidine conventional K-Ar J-272 "4.72E-04, 0.585E-04, 1.19E-04*" 11.85 5.76 94 age of volcanism 3402 1 16.71 0.9 plagioclase conventional K-Ar W-304 "4.72E-04, 0.585E-04, 1.19E-04*" 0.295 0.0713 19 age of volcanism 3403 1 15.61 0.4 sanidine conventional K-Ar W-302 "4.72E-04, 0.585E-04, 1.19E-04*" 10.1 2.28 92 age of volcanism 3404 1 160.14 2 hornblende conventional K-Ar YU-SW341 "4.72E-04, 0.584E-04, 1.19E-04*" 0.618 1.49 4758 age of intrusion "97.5% HORNBLENDE, 2.5% AMPHIBOLE AND EPIDOTE" REPLICATE ANALYSES 3405 1 154.19 4 hornblende conventional K-Ar YU-BV100 "4.72E-04, 0.584E-04, 1.19E-04*" 0.252 0.584 2228 "96% HORNBLENDE, 4% ALTERED AMPLIBOLE" REPLICATE ANALYSES AGE OF MINERALIZATION AND INTRUSION 3406 1 105.27 2 biotite conventional K-Ar YU-CA140 "4.72E-04, 0.584E-04, 1.19E-04*" 8.65 13.5 83 age of intrusion "99% BIOTITE, +80 MESH" REPLICATE POTASSIUM ANALYSES 3407 1 89.66 2 biotite conventional K-Ar YU-CA150 "4.72E-04, 0.584E-04, 1.19E-04*" 7.39 9.78 83 age of intrusion "99% BIOTITE, +80 MESH" REPLICATE POTASSIUM ANALYSES 3408 1 77.92 1.5 biotite conventional K-Ar YU-WH23 "4.72E-04, 0.584E-04, 1.19E-04*" 7.92 9.08 82 age of intrusion "99% BIOTITE, +80 MESH" REPLICATE POTASSIUM ANALYSES 3409 1 59 3 biotite conventional K-Ar USGS(M)-NKS7-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.95 6.86 83 age of intrusion "99% BIOTITE, +60 MESH" POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES "K-AR AGE OF 69.1+/-1.4 FOR BIOTITE REPORTED FOR THIS SAMPLE BY SILBERMAN AND MCKEE, 1971" 3410 1 257.22 3 hornblende YU-M1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.912 3.63 6374 age of volcanism "92% HORNBLENDE, 8% EPIDOTE AND CHLORITE; +100 MESH" REPLICATE ANALYSES 3411 1 291 3 hornblende conventional K-Ar YU-M2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.713 3.24 66 age of volcanism "98.3% BROWN HORNBLENDE, 1.7% EPIDOTE AND CHLORITE; +100 MESH" REPLICATE ANALYSES 3412 1 259.56 3 hornblende conventional K-Ar YU-EXC68 "4.72E-04, 0.584E-04, 1.19E-04*" 1.1 4.421 7382 age of volcanism "96% HORNBLENDE, 4% OTHER MINERALS, CHIEFLY CHLORITE; +100 MESH" REPLICATE ANALYSES 3413 1 215.98 3 hornblende conventional K-Ar YU-EXC1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.22 4.03 7984 "96.9% HORNBLENDE, 3% CHLORITE, EPIDOTE, AND FELDSPAR; +100 MESH" REPLICATE ANALYSES "SPURIOUS AGE, PROBABLY; PRIMARY AGE MAY BE 253 M.Y." 3414 1 24.01 5 pyroxenes conventional K-Ar YU-AUG1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.05 0.0174 23 age of volcanism "99% CLINOPYREXENE, +100 MESH" REPLICATE ANALYSES 3415 1 20 2 biotite conventional K-Ar I-SW193 "4.72E-04, 0.584E-04, 1.19E-04*" 8.32 2.4 69 Page (1965) age of intrusion "99% BIOTITE, +80 MESH" AGE LISTED BY PAGE (1965) 3416 1 100.15 3.5 biotite conventional K-Ar 1(SA-1) "4.72E-04, 0.585E-04, 1.19E-04*" 9.105 13.5 90 age of intrusion 3416 2 101.63 5 hornblende conventional K-Ar 1(SA-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.485 0.73 56 age of intrusion 3417 1 98.64 3.5 biotite conventional K-Ar 7(BATTL) "4.72E-04, 0.585E-04, 1.19E-04*" 9.345 13.64 90 age of intrusion 3418 1 96.5 3.7 biotite conventional K-Ar 8(TP-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.955 12.78 77 age of intrusion 3419 1 92.76 3.2 biotite conventional K-Ar 9(D-8) "4.72E-04, 0.585E-04, 1.19E-04*" 9.085 12.45 71 age of intrusion 3420 1 80.89 2.8 biotite conventional K-Ar 14(52-3) "4.72E-04, 0.585E-04, 1.19E-04*" 8.53 10.16 82 POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES AGE IS PROBABLY A HYBRID AGE 3420 2 101.41 5 hornblende conventional K-Ar 14(52-3) "4.72E-04, 0.585E-04, 1.19E-04*" 0.839 1.26 67 age of intrusion 3420 3 105.32 5 hornblende conventional K-Ar 14(52-3) "4.72E-04, 0.585E-04, 1.19E-04*" 0.839 1.31 69 age of intrusion 3421 1 150.4 7.5 hornblende conventional K-Ar 15(D-11) "4.72E-04, 0.585E-04, 1.19E-04*" 0.496 1.12 49 minimum age of intrusion 3422 1 177.52 8 hornblende conventional K-Ar 16(BC-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.35 0.94 51 age of intrusion 3422 2 98.63 3.5 biotite conventional K-Ar 16(BC-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 12.99 88 AGE IS APPARENTLY A HYBRID AGE 3423 1 98.56 3.5 biotite conventional K-Ar 17(35-4) "4.72E-04, 0.585E-04, 1.19E-04*" 9.195 13.41 90 age of intrusion 3424 1 94.16 3.9 biotite conventional K-Ar 18(T1010) "4.72E-04, 0.585E-04, 1.19E-04*" 8.99 12.51 81 age of intrusion 3424 2 97.45 6.3 hornblende conventional K-Ar 18(T1010) "4.72E-04, 0.585E-04, 1.19E-04*" 0.77 1.11 94 age of intrusion 3425 1 95.97 3.9 biotite conventional K-Ar 19(T946) "4.72E-04, 0.585E-04, 1.19E-04*" 9.175 13.02 94 age of intrusion 3425 2 91.72 5.9 hornblende conventional K-Ar 19(T946) "4.72E-04, 0.585E-04, 1.19E-04*" 0.75 1.016 92 age of intrusion 3426 1 104.99 4 biotite conventional K-Ar 20(T972) "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 12.84 91 age of intrusion 3427 1 106.38 4 biotite conventional K-Ar 21(T968) "4.72E-04, 0.585E-04, 1.19E-04*" 8.405 13.26 96 age of intrusion 3428 1 87.02 3.6 biotite conventional K-Ar 22(T961) "4.72E-04, 0.585E-04, 1.19E-04*" 7.655 9.826 93 age of intrusion 3428 2 90.75 6 hornblende conventional K-Ar 22(T961) "4.72E-04, 0.585E-04, 1.19E-04*" 0.675 0.9045 87 age of intrusion 3429 1 89.31 3.7 biotite conventional K-Ar 23(T944) "4.72E-04, 0.585E-04, 1.19E-04*" 8.975 11.83 95 age of intrusion 3429 2 92.32 6.1 hornblende conventional K-Ar 23(T944) "4.72E-04, 0.585E-04, 1.19E-04*" 0.69 0.941 77 age of intrusion 3430 1 93.41 3.8 biotite conventional K-Ar 24(T1047) "4.72E-04, 0.585E-04, 1.19E-04*" 9.585 13.23 95 age of intrusion 3430 2 96.14 6 hornblende conventional K-Ar 24(T1047) "4.72E-04, 0.585E-04, 1.19E-04*" 0.83 1.18 92 age of intrusion 3431 1 93.3 3.1 biotite conventional K-Ar 25(T975) "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 12.49 96 age of intrusion 3431 2 94.04 6.1 hornblende conventional K-Ar 25(T975) "4.72E-04, 0.585E-04, 1.19E-04*" 0.56 0.7783 76 age of intrusion 3432 1 92.1 1.8 biotite conventional K-Ar 1. USGS(M)-MB33B "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 12.08 89 age of intrusion 1% CHLORITE 3433 1 94.47 1.8 biotite conventional K-Ar 2. USGS(M)-MB34 "4.72E-04, 0.585E-04, 1.19E-04*" 8.73 12.19 86 age of intrusion 3433 2 90.49 1.8 hornblende conventional K-Ar 2. USGS(M)-MB34 "4.72E-04, 0.585E-04, 1.19E-04*" 0.694 0.9272 62 age of intrusion 3% PYROXENE "HORNBLENDE AGE REVISED TO 89.5 M.Y. BY SILBERMAN, BERGER, AND KOSKI, 1974, BASED ON NEW POTASSIUM ANALYSES" 3434 1 92.1 1.8 biotite conventional K-Ar 3. USGS(M)-MB32 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 11.59 92 age of intrusion 3435 1 149.48 3 biotite conventional K-Ar 4. USGS(M)-MB1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 18.13 89 age of intrusion 1% CHLORITE 3435 2 148.4 3 hornblende conventional K-Ar 4. USGS(M)-MB1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.78 1.737 74 age of intrusion 1% PYROXENE 3436 1 160.99 3 biotite conventional K-Ar 5. USGS(M)-MB3 "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 21.94 95 age of intrusion REPLICATE ARGON ANALYSES 3436 2 163.76 3 hornblende conventional K-Ar 5. USGS(M)-MB3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.641 1.582 78 age of intrusion "5% PYROXENE, 1% BIOTITE" 3437 1 156.87 3 biotite conventional K-Ar 6. USGS(M)-MB4 "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 18.57 67 age of intrusion 1% CHLORITE 3438 1 153.99 3 biotite conventional K-Ar 7. USGS(M)-MB27 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 21.2 92 age of intrusion 3439 1 35.68 0.7 biotite conventional K-Ar 8. USGS(M)-M125 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 4.275 8084 age of intrusion REPLICATE ARGON ANALYSES 3439 2 35.59 0.7 sanidine conventional K-Ar 8. USGS(M)-M125 "4.72E-04, 0.585E-04, 1.19E-04*" 11.6 6.003 98 age of intrusion 3440 1 38.18 0.8 biotite conventional K-Ar 9. USGS(M)-M124 "4.72E-04, 0.585E-04, 1.19E-04*" 8.79 4.883 7855 age of intrusion REPLICATE ARGON ANALYSES 3441 1 38.31 0.8 biotite conventional K-Ar 10. USGS(M)-M123 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 4.454 8183 age of intrusion 5% CHLORITE REPLICATE ARGON ANALYSES 3441 2 39.13 0.8 hornblende conventional K-Ar 10. USGS(M)-M123 "4.72E-04, 0.585E-04, 1.19E-04*" 1.077 0.6133 71 age of intrusion "1% BIOTITE, 1% PYROXENE" 3442 1 38.91 0.8 biotite conventional K-Ar 11. USGS(M)-MB7 "4.72E-04, 0.585E-04, 1.19E-04*" 7.66 4.338 63 age of intrusion 5% CHLORITE 3442 2 37.67 0.7 hornblende conventional K-Ar 11. USGS(M)-MB7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.953 0.5223 55 age of intrusion 4% BIOTITE 3443 1 37.95 0.7 biotite conventional K-Ar 12. USGS(M)-M119 "4.72E-04, 0.585E-04, 1.19E-04*" 7.25 4.003 38 age of intrusion 2% CHLORITE 3443 2 36.96 0.7 hornblende conventional K-Ar 12. USGS(M)-M119 "4.72E-04, 0.585E-04, 1.19E-04*" 0.892 0.4796 63 age of intrusion LESS THAN 1% BIOTITE PRESENT 3444 1 39.09 0.8 hornblende conventional K-Ar 13. USGS(M)-MB8 "4.72E-04, 0.585E-04, 1.19E-04*" 1.021 0.5809 40 age of intrusion "4% PYROXENE, 2% CHLORITE" 3445 1 35.99 0.7 biotite conventional K-Ar 14. USGS(M)-M103B "4.72E-04, 0.585E-04, 1.19E-04*" 7.61 3.983 71 age of intrusion 7% CHLORITE 3446 1 95.06 1.9 sericite conventional K-Ar 15. USGS(M)-MGW72 "4.72E-04, 0.585E-04, 1.19E-04*" 9.97 14.01 89 POSSIBLE AGE OF ALTERATION ACCOMPANIED BY GOLD DEPOSITION 3446 2 101.21 2 biotite conventional K-Ar 15. USGS(M)-MGW72 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 12.32 86 minimum age of intrusion 12% CHLORITE 3447 1 96.56 1.9 sericite conventional K-Ar 16. USGS(M)-M5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.34 11.91 95 POSSIBLE AGE OF ALTERATION ACCOMPANIED BY GOLD DEPOSITION 3448 1 89.32 1.7 biotite conventional K-Ar 17. USGS(M)-MB25 "4.72E-04, 0.585E-04, 1.19E-04*" 7.38 9.729 79 age of intrusion 3% CHLORITE 3449 1 89.08 1.7 biotite conventional K-Ar 18. USGS(M)-M26 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 10.78 76 age of intrusion 3450 1 38.15 0.7 biotite conventional K-Ar 19. USGS(M)-MB12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.45 4.69 66 age of intrusion 3451 1 39.14 0.8 biotite conventional K-Ar 20. USGS(M)-MB23 "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 5.155 82 minimum age of intrusion 3452 1 39.42 0.8 biotite conventional K-Ar 21. USGS(M)-M18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 4.9 87 minimum age of intrusion 3453 1 38.18 0.7 whole rock conventional K-Ar 22. USGS(M)-MRB6500 "4.72E-04, 0.585E-04, 1.19E-04*" 9.51 5.283 81 age of metamorphic crystallization SULFIDES REMOVED BEFORE ANALYSIS APPARENT AGE OF MINERALIZATION 3454 1 38.03 0.7 whole rock conventional K-Ar 23. USGS(M)-MB52 "4.72E-04, 0.585E-04, 1.19E-04*" 2.55 1.411 52 age of metamorphic crystallization SULFIDES REMOVED BEFORE ANALYSIS APPARENT AGE OF MINERALIZATION 3455 1 105.99 2 biotite conventional K-Ar 24. USGS(M)-MB42 "4.72E-04, 0.585E-04, 1.19E-04*" 6.91 10.86 7882 age of intrusion REPLICATE ARGON ANALYSES 3456 1 156.8 3 biotite conventional K-Ar 25. USGS(M)-MB41 "4.72E-04, 0.585E-04, 1.19E-04*" 9.15 21.58 8992 age of intrusion REPLICATE ARGON ANALYSES 3457 1 133.97 3 biotite conventional K-Ar 26. USGS(M)-MB45 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 18.42 93 initial age disturbed by later metamorphism 2% CHLORITE 3457 2 152.75 3 hornblende conventional K-Ar 26. USGS(M)-MB45 "4.72E-04, 0.585E-04, 1.19E-04*" 1.078 2.474 83 age of intrusion "2% PYROXENE, 2% BIOTITE" 3458 1 156.66 3 biotite conventional K-Ar 28. USGS(M)-M273 "4.72E-04, 0.585E-04, 1.19E-04*" 9.32 21.96 91 age of intrusion 3459 1 158.66 3 biotite conventional K-Ar 29. USGS(M)-M272 "4.72E-04, 0.585E-04, 1.19E-04*" 7.35 17.55 89 age of intrusion 3460 1 73.06 1.4 biotite conventional K-Ar 30. USGS(M)-M274 "4.72E-04, 0.585E-04, 1.19E-04*" 7.63 8.19 77 age of intrusion 3461 1 69.61 2.7 biotite conventional K-Ar 31. USGS(M)-M335 "4.72E-04, 0.585E-04, 1.19E-04*" 8.73 8.92 23 age of intrusion 3462 1 172.25 3 biotite conventional K-Ar 32. USGS(M)-M050 "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 21.65 76 age of intrusion 3463 1 154.43 3 biotite conventional K-Ar 33. USGS(M)-M275 "4.72E-04, 0.585E-04, 1.19E-04*" 6.63 15.39 90 age of intrusion 3464 1 157.92 3 biotite conventional K-Ar 34. USGS(M)-M3-13 "4.72E-04, 0.585E-04, 1.19E-04*" 8.27 19.65 9788 age of intrusion REPLICATE ARGON ANALYSES 3465 1 80.12 1.6 muscovite conventional K-Ar 35. USGS(M)-M25-5 "4.72E-04, 0.585E-04, 1.19E-04*" 10.2 12.03 8475 age of intrusion REPLICATE ARGON ANALYSES 3466 1 34.28 0.7 biotite conventional K-Ar 36. USGS(M)-M14 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 4.335 3236 age of intrusion REPLICATE ARGON ANALYSES 3467 1 36.5 0.7 biotite conventional K-Ar 37. USGS(M)-66B87 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 4.587 77 age of intrusion 3468 1 102.16 2 biotite conventional K-Ar 38. USGS(M)-AD39 "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 10.23 85 minimum age of intrusion 13% CHLORITE PRESENT AGE MAY NOT BE PRIMARY AGE 3469 1 114.07 4 biotite conventional K-Ar G-BO464 "4.72E-04, 0.585E-04, 1.19E-04*" 7.35 12.46 age of intrusion 3470 1 112.65 3 biotite conventional K-Ar G-BO446 "4.72E-04, 0.585E-04, 1.19E-04*" 6.31 10.56 age of intrusion ALSO A MINIMUM AGE FOR THE COPPER MINERALIZATION 3471 1 24.31 0.9 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.06 2.84 81 age of volcanism 3472 1 23.88 0.9 sanidine conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.57 2.62 77 age of volcanism 3473 1 24.57 1 sanidine conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 10.39 3.7 86 age of volcanism 3474 1 25.39 1 sanidine conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 10.05 3.7 96 age of volcanism 3475 1 27.02 1 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 4.67 1.83 67 age of volcanism 3476 1 27.68 1 sanidine conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 3.59 83 age of volcanism 3477 1 27.57 1 sanidine conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 3.62 94 age of volcanism 3478 1 28.74 1.1 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 3.52 39 age of volcanism 3479 1 31.72 1.2 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 3.98 77 age of volcanism 3479 2 29.17 1.1 sanidine conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 11.22 4.75 88 age of volcanism 3480 1 24.17 0.9 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 7.48 2.62 73 age of volcanism 3481 1 22.48 0.9 sanidine conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 2.71 84 age of volcanism 3482 1 26.85 1 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 7.6 2.96 79 age of volcanism 3483 1 24.73 1 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 6.89 2.47 57 age of volcanism 3484 1 25.44 1 sanidine conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 9.87 3.64 87 age of volcanism 3485 1 25.77 1 sanidine conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 10.33 3.86 93 age of volcanism 3486 1 26.14 1 sanidine conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 10.5 3.98 85 age of volcanism 3487 1 27.19 1 biotite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 7.91 3.12 75 age of volcanism 3487 2 25.84 1 sanidine conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 11.05 4.14 88 age of volcanism 3488 1 15.69 0.8 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.92 2.25 88 age of volcanism "THIS AGE PUBLISHED BY J. GILLULY, 1967, IN USGS MAP GQ-656; AGE ONLY" 3489 1 34.48 1.1 sanidine conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 11.95 5.99 91 age of volcanism 3491 1 25.02 biotite conventional K-Ar 67W261 "4.72E-04, 0.585E-04, 1.19E-04*" 7.605 2.758 79 age of volcanism 3491 2 24.13 biotite conventional K-Ar 67W262 "4.72E-04, 0.585E-04, 1.19E-04*" 7.65 2.675 85 age of volcanism 3492 1 19.82 0.6 biotite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 2.35 48 age of volcanism 3493 1 23.66 0.7 sanidine conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 5.98 2.05 53 age of volcanism 3494 1 32.7 1.3 sanidine conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04" 11.71 2.46 89 age of volcanism (*) 3495 1 39.61 0.8 biotite conventional K-Ar 73 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 4.74 87 age of volcanism 3496 1 33.94 0.7 sanidine conventional K-Ar 76 "4.72E-04, 0.585E-04, 1.19E-04*" 4.46 2.2 74 age of volcanism 3496 2 35.78 0.7 biotite conventional K-Ar 76 "4.72E-04, 0.585E-04, 1.19E-04*" 6.17 3.21 80 age of volcanism 3497 1 34.78 0.9 biotite conventional K-Ar 77 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 4.04 45 age of volcanism 3498 1 40.35 0.8 biotite conventional K-Ar 78 "4.72E-04, 0.585E-04, 1.19E-04*" 8 4.7 88 age of volcanism 3499 1 31.38 1.1 biotite conventional K-Ar 87 "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 3.5 71 age of volcanism 3500 1 30.8 1 biotite conventional K-Ar 92 "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 3.39 54 age of volcanism 3501 1 31.87 1.1 sanidine conventional K-Ar 93 "4.72E-04, 0.585E-04, 1.19E-04*" 9.96 4.61 85 age of volcanism 3502 1 33.13 1.1 sanidine conventional K-Ar 94 "4.72E-04, 0.585E-04, 1.19E-04*" 10.2 4.91 92 age of volcanism 3503 1 36.16 0.8 biotite conventional K-Ar 95 "4.72E-04, 0.585E-04, 1.19E-04*" 7.72 4.06 90 age of volcanism 3503 2 33.81 0.8 sanidine conventional K-Ar 95 "4.72E-04, 0.585E-04, 1.19E-04*" 12.07 5.93 98 minimum age of volcanism 3504 1 36.08 1.1 biotite conventional K-Ar 97 "4.72E-04, 0.585E-04, 1.19E-04*" 8.12 4.26 86 age of volcanism 3505 1 36.07 1.9 hornblende conventional K-Ar 98(PS66B-59) "4.72E-04, 0.585E-04, 1.19E-04*" 1.22 0.64 65 age of volcanism 3506 1 35.68 1.4 biotite conventional K-Ar 99(PS66B-55) "4.72E-04, 0.585E-04, 1.19E-04*" 6.94 3.6 78 age of volcanism 3507 1 35.13 1 biotite conventional K-Ar 100(PS66B-31) "4.72E-04, 0.585E-04, 1.19E-04*" 7.97 4.07 79 age of volcanism 3508 1 35.61 0.7 biotite conventional K-Ar 101(E-13) "4.72E-04, 0.585E-04, 1.19E-04*" 8.41 4.354 89 age of intrusion 3509 1 34.6 1.9 biotite conventional K-Ar 102(PS66B-81) "4.72E-04, 0.585E-04, 1.19E-04" 8.11 3.29 69 age of volcanism (*) 3510 1 36.19 0.7 biotite conventional K-Ar 103(E-29) "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 4.51 86 age of volcanism 3511 1 38.73 1.3 hornblende conventional K-Ar 104(PS68-5) "4.72E-04, 0.585E-04, 1.19E-04*" 0.621 0.35 54 age of intrusion 3512 1 35.45 0.7 sanidine conventional K-Ar 105(E-14) "4.72E-04, 0.585E-04, 1.19E-04*" 11.39 5.87 97 age of intrusion 3513 1 33.83 1 biotite conventional K-Ar 106(E-15) "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 3.85 34 age of volcanism 3513 2 35.54 0.7 sanidine conventional K-Ar 106(E-15) "4.72E-04, 0.585E-04, 1.19E-04*" 11.92 6.16 92 age of volcanism 3514 1 36.39 0.7 biotite conventional K-Ar 107(E-19) "4.72E-04, 0.585E-04, 1.19E-04*" 7.69 4.07 88 age of intrusion 3514 2 35.86 0.7 sanidine conventional K-Ar 107(E-19) "4.72E-04, 0.585E-04, 1.19E-04*" 12.33 6.43 98 age of intrusion 3515 1 38.98 0.8 biotite conventional K-Ar 109(PS64B-17) "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 4.3 91 age of volcanism 3516 1 35.93 0.8 biotite conventional K-Ar 110A "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 4.41 95 age of volcanism 3517 1 35.9 0.8 biotite conventional K-Ar 110B(PS64B-18) "4.72E-04, 0.585E-04, 1.19E-04*" 7.7 4.02 83 age of volcanism 3518 1 37.11 0.7 biotite conventional K-Ar 111(E-16) "4.72E-04, 0.585E-04, 1.19E-04*" 8.78 4.74 89 age of volcanism 3519 1 37.65 1.3 biotite conventional K-Ar 112(PS68-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 4.59 74 age of volcanism 3520 1 36.47 1.3 hornblende conventional K-Ar 113(PS68-6) "4.72E-04, 0.585E-04, 1.19E-04*" 1.15 0.61 57 age of volcanism 3521 1 34.66 1 whole rock conventional K-Ar 114(E-8) "4.72E-04, 0.585E-04, 1.19E-04*" 3.85 1.94 94 age of volcanism (HIGH POTASSIUM VALUE FOR BASALT--COMPILER) 3522 1 34.71 0.7 biotite conventional K-Ar 115(E-27) "4.72E-04, 0.585E-04, 1.19E-04*" 7.77 3.92 74 age of volcanism 3523 1 37.32 1.3 biotite conventional K-Ar 116(PS68-2) "4.72E-04, 0.585E-04, 1.19E-04*" 7.94 4.31 85 age of intrusion 3524 1 35.35 1.4 biotite conventional K-Ar 117(E64B-3) "4.72E-04, 0.585E-04, 1.19E-04*" 7.49 3.85 75 age of intrusion 3525 1 34.56 0.7 sanidine conventional K-Ar 119(E-32) "4.72E-04, 0.585E-04, 1.19E-04*" 12.52 6.29 96 age of volcanism 3526 1 33.94 1 whole rock conventional K-Ar 120(E-12) "4.72E-04, 0.585E-04, 1.19E-04*" 2.21 1.09 59 age of volcanism 3527 1 23.62 0.9 sanidine conventional K-Ar 122(B68-119) "4.72E-04, 0.585E-04, 1.19E-04*" 10.84 3.71 82 age of volcanism 3528 1 22.64 0.9 sanidine conventional K-Ar 123(PS65B-27) "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 2.63 82 age of volcanism 3529 1 35.48 1.3 hornblende conventional K-Ar 125(PS68-3) "4.72E-04, 0.585E-04, 1.19E-04*" 1.26 0.65 52 age of volcanism 3530 1 36.02 1.9 plagioclase conventional K-Ar 126(PS65B-35) "4.72E-04, 0.585E-04, 1.19E-04*" 0.42 0.22 10 age of volcanism 3531 1 35.24 0.7 biotite conventional K-Ar 127(E-21) "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 4.38 93 age of volcanism 3532 1 35.94 1.4 biotite conventional K-Ar 136 "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 4.52 72 age of volcanism 3533 1 36.44 1.4 biotite conventional K-Ar 137 "4.72E-04, 0.585E-04, 1.19E-04*" 8.34 4.42 80 age of volcanism 3534 1 35.46 1.9 biotite conventional K-Ar 138 "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 4.32 62 age of volcanism 3535 1 35.61 1.4 biotite conventional K-Ar 139 "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 4.5 21 age of volcanism 3536 1 33.99 0.7 biotite conventional K-Ar 140 "4.72E-04, 0.585E-04, 1.19E-04*" 5.79 2.86 65 age of volcanism 3537 1 35.36 0.7 biotite conventional K-Ar 141 "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 4.37 3281 age of intrusion AVERAGE OF TWO ARGON ANALYSES 3538 1 24.9 0.6 sanidine conventional K-Ar 145 "4.72E-04, 0.585E-04, 1.19E-04*" 9.91 3.57 95 age of volcanism 3538 2 28.35 0.5 biotite conventional K-Ar 145 "4.72E-04, 0.585E-04, 1.19E-04*" 7.34 3.02 77 age of volcanism 3539 1 37.47 0.7 biotite conventional K-Ar 146 "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 4.78 90 age of intrusion 3540 1 14.55 0.3 sanidine conventional K-Ar 147 "4.72E-04, 0.585E-04, 1.19E-04*" 7.7 1.62 88 age of volcanism 3541 1 38.03 0.7 sanidine conventional K-Ar 148 "4.72E-04, 0.585E-04, 1.19E-04*" 11.26 6.23 92 age of intrusion 3541 2 38 0.7 biotite conventional K-Ar 148 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 4.81 84 age of intrusion 3542 1 42.45 0.8 biotite conventional K-Ar 149 "4.72E-04, 0.585E-04, 1.19E-04*" 7.26 4.49 82 age of intrusion 3543 1 81.54 2 biotite conventional K-Ar G-B0553/NBM-AD11 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 11 6973 minimum age of intrusion REPLICATE ANALYSES 3544 1 11.02 1.2 biotite conventional K-Ar G-B0642/NBM-AD13 "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 1.33 3040 minimum age of intrusion REPLICATE ANALYSES A DIKE SWARM CUTS THIS PLUTON; AGE REFLECTS REHEATING 3545 1 48.34 2 biotite conventional K-Ar G-B0805/NBM-AD17 "4.72E-04, 0.585E-04, 1.19E-04*" 3.87 2.73 5658 minimum age of intrusion REPLICATE ANALYSES (LOW POTASSIUM VALUE FOR BIOTITE--COMPILER) 3546 1 90.98 2.7 biotite conventional K-Ar G-B0835/NBM-AD18 "4.72E-04, 0.585E-04, 1.19E-04*" 9.23 12.4 9195 age of intrusion REPLICATE ANALYSES 3547 1 78.73 2.8 biotite conventional K-Ar G-B0836/NBM-AD19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 10.3 8693 age of intrusion REPLICATE ANALYSES 3548 1 161.26 6 biotite conventional K-Ar G-B0837/NBM-AD20 "4.72E-04, 0.585E-04, 1.19E-04*" 7 17 8895 age of intrusion REPLICATE ANALYSES 3549 1 14.36 0.6 biotite conventional K-Ar G-B0920/NBM-AD23 "4.72E-04, 0.585E-04, 1.19E-04*" 7.47 1.55 6061 age of intrusion REPLICATE ANALYSES 3550 1 89.67 2.7 biotite conventional K-Ar G-B0921/NBM-AD24 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 11.7 8990 age of intrusion REPLICATE ANALYSES 3551 1 92.67 2.7 biotite conventional K-Ar G-B0922/NBM-AD25 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 11.5 9093 age of intrusion REPLICATE ANALYSES 3552 1 92.56 2.7 biotite conventional K-Ar G-B0997/NBM-AD28 "4.72E-04, 0.585E-04, 1.19E-04*" 8.63 11.8 8182 age of intrusion REPLICATE ANALYSES 3553 1 95.3 2.9 biotite conventional K-Ar G-B1291/NBM-AD33 "4.72E-04, 0.585E-04, 1.19E-04*" 8.53 12.02 92 age of intrusion REPLICATE ANALYSES 3554 1 105.62 6 hornblende conventional K-Ar G-A1328/NBM-AD36 "4.72E-04, 0.585E-04, 1.19E-04*" 1.06 1.66 7479 age of intrusion REPLICATE ANALYSES 3555 1 97.98 3 biotite conventional K-Ar G-B1329/NBM-AD38 "4.72E-04, 0.585E-04, 1.19E-04*" 7.85 11.38 8184 age of intrusion REPLICATE ANALYSES 3556 1 127.04 9 hornblende conventional K-Ar G-A1525/NBM-SCP28 "4.72E-04, 0.585E-04, 1.19E-04*" 0.428 0.811 3336 age of intrusion REPLICATE ANALYSES 3557 1 150.3 8 hornblende conventional K-Ar G-A1526/NBM-SCP120 "4.72E-04, 0.585E-04, 1.19E-04*" 0.417 0.941 4955 age of intrusion REPLICATE ANALYSES 3558 1 102.4 3 biotite conventional K-Ar G-B0919/NBM-AD22 "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 13 92 minimum age of intrusion HYDROBIOTITE FROM MINERALIZING SOLUTIONS "AGE OF MINERALIZATION, ALTERATION, AND INTRUSION" 3571 1 39.63 1.3 K feldspar conventional K-Ar 146 "4.72E-04, 0.585E-04, 1.19E-04*" 5.96 3.438 80 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS, DENVER, COLORADO" 3571 2 39.27 1.3 biotite conventional K-Ar 146 "4.72E-04, 0.585E-04, 1.19E-04*" 7.41 4.235 81 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS, DENVER, COLORADO" 3572 1 42.44 1.4 biotite conventional K-Ar 188 "4.72E-04, 0.585E-04, 1.19E-04*" 7.26 4.488 82 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS, DENVER, COLORADO" 3573 1 38.02 1.3 biotite conventional K-Ar 174 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 4.813 84 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS, DENVER, COLORADO" 3573 2 38.03 1 sanidine conventional K-Ar 174 "4.72E-04, 0.585E-04, 1.19E-04*" 11.26 6.231 92 age of volcanism "UNPUBLISHED AGE AND ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS, DENVER, COLORADO" 3574 1 26.28 1.3 K feldspar conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.9 2.63 78 age of volcanism 3575 1 23.8 0.8 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.66 2.642 62 age of volcanism 3576 1 21.9 4 plagioclase conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.457 0.145 24 age of volcanism 3577 1 20.08 0.6 K feldspar conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 5.95 1.73 68 age of volcanism 3578 1 27.02 1.2 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 3.28 30 age of volcanism 3578 2 26.36 1.3 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 3.2 71 age of volcanism 3579 1 27 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3580 1 18.6 1.5 biotite conventional K-Ar KA-52 "4.72E-04, 0.585E-04, 1.19E-04" 7 "age of uplift and cooling, initial age disturbed by later metamorphism" "POTASSIUM VALUE SUPPLIED BY C.H. THORMAN, USGS, DENVER, COLORADO" 3581 1 42.4 3.4 biotite conventional K-Ar KA-53 "4.76E-04, 0.586E-04" 5.06 "age of uplift and cooling, initial age disturbed by later metamorphism" "POTASSIUM VALUE SUPPLIED BY C.H. THORMAN, USGS, DENVER, COLORADO" 3582 1 29.8 2.4 biotite conventional K-Ar KA-54 "4.72E-04, 0.585E-04, 1.19E-04" 3.29 age of uplift and cooling "POTASSIUM VALUE SUPPLIED BY C.H. THORMAN, USGS, DENVER, COLORADO" 3583 1 29.7 2.4 biotite conventional K-Ar KA-55 "4.72E-04, 0.585E-04, 1.19E-04" 7.02 initial age disturbed by later metamorphism "POTASSIUM VALUE SUPPLIED BY C.H. THORMAN, USGS, DENVER, COLORADO" 3584 1 41.5 3.3 biotite conventional K-Ar KA-68 "4.72E-04, 0.585E-04, 1.19E-04" 8.59 initial age disturbed by later metamorphism "POTASSIUM VALUE SUPPLIED BY C.H. THORMAN, USGS, DENVER, COLORADO" 3585 1 105 0.5 Unk (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3588 1 34 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 3589 1 15.27 0.5 biotite conventional K-Ar 8(G/UCD-GAX17) "4.72E-04, 0.585E-04, 1.19E-04*" 6.93 1.53 17 age of volcanism MINERAL CONCENTRATE FROM ONE LARGE PUMICE BLOCK ARGON VALUE IS AVERAGE OF FOUR ANALYSES 3590 1 12.76 0.2 biotite conventional K-Ar 9(USGS(M)-C1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.09 1.492 48 age of volcanism 3591 1 16.91 0.5 plagioclase conventional K-Ar 11(USGS(M)-C9) "4.72E-04, 0.585E-04, 1.19E-04*" 0.359 0.0878 39 age of volcanism 3592 1 13.81 0.3 hornblende conventional K-Ar 22(USGS(M)-711-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.708 0.1413 49 age of volcanism 4% PYROXENE PRESENT 3593 1 14.75 0.3 hornblende conventional K-Ar 23(USGS(M)-668-G10) "4.72E-04, 0.585E-04, 1.19E-04*" 0.658 0.1403 43 age of volcanism 4% PYROXENE PRESENT 3594 1 15.4 0.3 plagioclase conventional K-Ar 24(USGS(M)-711-8) "4.72E-04, 0.585E-04, 1.19E-04" 0.993 0.7144 43 age of intrusion (*) "MAY BE VOLCANIC NECK--VENT FOR ANDESITE FLOWS, NOW MINERALIZED" 3595 1 11.49 0.2 biotite conventional K-Ar 26(USGS(M)712-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.47 1.405 50 age of intrusion ANDESITE FLOWS COME FROM THIS INTRUSIVE VENT 3595 2 11.21 0.3 plagioclase conventional K-Ar 26(USGS(M)712-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.594 0.0962 45 age of intrusion 3595 3 11.9 0.3 hornblende conventional K-Ar 26(USGS(M)-712-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.69 0.1186 38 age of intrusion 3596 1 11.54 0.2 biotite conventional K-Ar 27(USGS(M)710-7) "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 1.393 74 age of volcanism 3597 1 11.23 0.2 biotite conventional K-Ar 28(USGS(M)-NTS10B) "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 1.357 56 age of volcanism 3597 2 11.25 0.2 sanidine conventional K-Ar 28(USGS(M)-NTS10B) "4.72E-04, 0.585E-04, 1.19E-04*" 11.3 1.836 64 age of volcanism 3598 1 10.13 0.3 sanidine conventional K-Ar 29(USGS(M)-BAGHDAD) "4.72E-04, 0.585E-04, 1.19E-04*" 11.4 1.668 33 age of intrusion 3598 2 10.47 0.4 plagioclase conventional K-Ar 29(USGS(M)-BAGHDAD) "4.72E-04, 0.585E-04, 1.19E-04*" 0.693 0.1048 23 age of intrusion 3599 1 2.58 0.1 biotite conventional K-Ar 30(USGS(M)-670G4) "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 0.3252 25 age of intrusion 3600 1 2.58 0.2 biotite conventional K-Ar 31(USGS(M)-610-1B) "4.72E-04, 0.585E-04, 1.19E-04*" 7.65 0.2844 25 age of intrusion 3600 2 2.77 0.2 hornblende conventional K-Ar 31(USGS(M)-610-1B) "4.72E-04, 0.585E-04, 1.19E-04*" 0.948 0.0379 18 age of intrusion 3601 1 0.26 0.05 whole rock conventional K-Ar 32(USGS(M)-672-2) "4.72E-04, 0.585E-04, 1.19E-04*" 3.27 0.0121 7 age of volcanism 3602 1 2.25 0.1 whole rock conventional K-Ar 33(USGS(M)-611-5) "4.72E-04, 0.585E-04, 1.19E-04*" 4.48 0.1451 29 age of volcanism 3602 2 2.54 0.2 hornblende conventional K-Ar 33(USGS(M)-611-5) "4.72E-04, 0.585E-04, 1.19E-04*" 1.09 0.0399 21 age of volcanism 5% PYROXENE PRESENT 3603 1 21.99 0.4 biotite conventional K-Ar 70(Z15326-9A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 2.73 76 age of volcanism 3604 1 22.63 0.7 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 10.42 3.417 59 age of volcanism 3605 1 29.17 1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 3.506 54 age of volcanism 3607 1 30.62 1 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 3.717 71 age of volcanism "MCKEE AND OTHERS, 1971, REPORT MINERAL AS BIOTITE FOR THIS ANALYSIS--COMPILER" 3608 1 35.63 1.2 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.965 0.5 57 age of volcanism 3609 1 25.13 0.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 3.046 47 age of volcanism 3610 1 30.7 1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 6.69 2.982 65 age of volcanism 3612 1 36.13 3.3 hornblende conventional K-Ar G-A1674/NBM-AD40 "4.72E-04, 0.585E-04, 1.19E-04*" 0.59 0.31 1720 age of intrusion 3613 1 96.98 3.2 sericite conventional K-Ar G-M1675/NBM-AD41 "4.72E-04, 0.585E-04, 1.19E-04*" 5.34 7.66 7273 minimum age of intrusion METALLIZATION EITHER CONTEMPORANEOUS OR YOUNGER THAN ALTERATION; AGE OF ALTERATION 3614 1 22.6 0.6 sanidine conventional K-Ar C4 "4.72E-04, 0.585E-04, 1.19E-04*" 11 3.6 82 age of volcanism 3615 1 23.62 0.6 sanidine conventional K-Ar B17 "4.72E-04, 0.585E-04, 1.19E-04*" 10.84 3.71 82 age of volcanism 3616 1 31.75 0.8 sanidine conventional K-Ar W1 "4.72E-04, 0.585E-04, 1.19E-04*" 12.36 5.7 62 age of volcanism 3617 1 31.08 0.8 sanidine conventional K-Ar W3 "4.72E-04, 0.585E-04, 1.19E-04*" 12.85 5.8 83 age of volcanism 3617 2 32.46 0.8 biotite conventional K-Ar W3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.78 4.14 49 age of volcanism 3618 1 30.58 0.8 sanidine conventional K-Ar W4 "4.72E-04, 0.585E-04, 1.19E-04*" 13.04 5.79 84 age of volcanism 3618 2 32.45 0.8 biotite conventional K-Ar W4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 4.12 40 age of volcanism 3619 1 30.93 0.8 sanidine conventional K-Ar W8 "4.72E-04, 0.585E-04, 1.19E-04*" 13.09 5.88 69 age of volcanism 3619 2 31.43 0.8 biotite conventional K-Ar W8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.85 4.04 81 age of volcanism 3620 1 31.17 0.8 sanidine conventional K-Ar W9 "4.72E-04, 0.585E-04, 1.19E-04*" 12.35 5.59 73 age of volcanism 3620 2 31.46 0.8 biotite conventional K-Ar W9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 3.82 77 age of volcanism 3621 1 32.06 0.8 sanidine conventional K-Ar P1 "4.72E-04, 0.585E-04, 1.19E-04*" 12.09 5.63 91 age of volcanism 3622 1 30.89 0.8 sanidine conventional K-Ar P2 "4.72E-04, 0.585E-04, 1.19E-04*" 12.04 5.4 78 age of volcanism 3622 2 31.47 0.8 biotite conventional K-Ar P2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 3.83 41 age of volcanism 3623 1 33.38 0.8 sanidine conventional K-Ar P3 "4.72E-04, 0.585E-04, 1.19E-04*" 12.41 6.02 89 age of volcanism 3623 2 34.75 0.9 biotite conventional K-Ar P3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 4.42 68 age of volcanism 3624 1 32.79 0.8 biotite conventional K-Ar P4/PS65B-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 4.04 82 age of volcanism 3624 2 33.46 0.8 biotite conventional K-Ar P4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 4.23 75 age of volcanism 3625 1 33.99 0.8 sanidine conventional K-Ar S2 "4.72E-04, 0.585E-04, 1.19E-04*" 12.59 6.22 86 age of volcanism 3625 2 35.76 0.9 biotite conventional K-Ar S2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.77 4.04 48 age of volcanism 3626 1 34.09 0.8 sanidine conventional K-Ar S3 "4.72E-04, 0.585E-04, 1.19E-04*" 13.04 6.46 90 age of volcanism 3626 2 35.84 0.9 biotite conventional K-Ar S3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 4.3 42 age of volcanism 3627 1 25.88 1 biotite conventional K-Ar G-B1945/NBM-AD45 "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 3.25 45 age of volcanism 3628 1 29.35 1.1 biotite conventional K-Ar G-B1788/NBM-AD43 "4.72E-04, 0.585E-04, 1.19E-04*" 8.522 3.63 43 age of volcanism 3629 1 82.37 3 biotite conventional K-Ar G-B1928/NBM-AD46 "4.72E-04, 0.585E-04, 1.19E-04*" 7.796 9.46 68 age of intrusion 3630 1 146.67 8 hornblende conventional K-Ar G-A1787/NBM-AD42 "4.72E-04, 0.585E-04, 1.19E-04*" 0.891 1.96 51 age of intrusion 3631 1 15.03 0.4 adularia conventional K-Ar BUCKHORN "4.72E-04, 0.585E-04, 1.19E-04*" 12.47 2.709 52 AGE OF MINERALIZATION 3632 1 89.32 1.7 biotite conventional K-Ar 1. (MB-25) "4.72E-04, 0.585E-04, 1.19E-04*" 7.38 9.729 79 age of intrusion 3% CHLORITE; -20+60 MESH SAMPLE 3633 1 89.08 1.7 biotite conventional K-Ar 2. (MB-26) "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 10.78 76 age of intrusion LESS THAN 1% CHLORITE; -20+140 MESH SAMPLE 3634 1 42.14 1.4 hornblende conventional K-Ar 3. (MB-20) "4.72E-04, 0.585E-04, 1.19E-04*" 0.685 0.4205 23 age of intrusion LESS THAN 1% PYROXENE; -100+150 MESH SAMPLE 3634 2 40.15 0.8 biotite conventional K-Ar 3. (MB-20) "4.72E-04, 0.585E-04, 1.19E-04*" 7.2 4.209 62 age of intrusion 2% CHLORITE; -50+150 MESH SAMPLE 3635 1 38.24 0.7 biotite conventional K-Ar 4. (MB-12) "4.72E-04, 0.585E-04, 1.19E-04*" 8.43 4.691 66 age of intrusion LESS THAN 1% CHLORITE; -48+80 MESH SAMPLE 3636 1 38.22 0.7 biotite conventional K-Ar 5. (MB-16) "4.72E-04, 0.585E-04, 1.19E-04*" 8.45 4.699 74 age of intrusion LESS THAN 1% CHLORITE; -42+60 MESH SAMPLE 3637 1 38.48 0.8 biotite conventional K-Ar 6. (MB-21) "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 4.939 60 age of intrusion LESS THAN 1% SERICITE; -35+60 MESH SAMPLE 3638 1 40.01 0.8 biotite conventional K-Ar 7. (MB-9) "4.72E-04, 0.585E-04, 1.19E-04*" 7.78 4.532 83 age of intrusion LESS THAN 1% IMPURITY; -80+100 MESH SAMPLE 3638 2 39.75 0.8 hornblende conventional K-Ar 7. (MB-9) "4.72E-04, 0.585E-04, 1.19E-04*" 2.8 1.62 80 age of intrusion 10% BIOTITE; -80+100 MESH SAMPLE 3639 1 39.19 0.8 biotite conventional K-Ar 8. (MB-19) "4.72E-04, 0.585E-04, 1.19E-04*" 7.92 4.518 79 age of intrusion 1% CHLORITE; -60+150 MESH SAMPLE 3640 1 39.42 0.8 biotite conventional K-Ar 9. (MB-18) "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 4.9 87 age of intrusion LESS THAN 1% CHLORITE; -60+100 MESH SAMPLE 3641 1 39.14 0.8 biotite conventional K-Ar 10. (MB-23) "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 5.155 82 age of intrusion -40+80 MESH 3642 1 38.96 0.8 biotite conventional K-Ar 11. (MB-30) "4.72E-04, 0.585E-04, 1.19E-04*" 9.38 5.318 63 age of intrusion -80+100 MESH 3643 1 38.54 0.8 biotite conventional K-Ar 11. (MB-40) "4.72E-04, 0.585E-04, 1.19E-04*" 9 5.048 78 minimum age of intrusion 2% CHLORITE; -42+65 MESH SAMPLE MAY BE AGE OF MINERALIZATION 3644 1 38.18 0.7 whole rock conventional K-Ar 13. (MB-6500) "4.72E-04, 0.585E-04, 1.19E-04*" 9.51 5.283 81 "-100+150 MESH MATERIAL CONSISTING OF BIOTITE, K-FELDSPAR, WHITE MICA, QUARTZ, AND PLAGIOCLASE SEPARATED FROM PYRITE AND CHALCOPYRITE" ALTERATION AGE; AGE OF MINERALIZATION 3645 1 38.03 0.7 whole rock conventional K-Ar 14. (MB-52) "4.72E-04, 0.585E-04, 1.19E-04*" 2.55 1.411 52 "-100+150 MESH MATERIAL CONSISTING OF BIOTITE, K-FELDSPAR, WHITE MICA, QUARTZ, AND PLAGIOCLASE SEPARATED FROM PYRITE AND CHALCOPYRITE" ALTERATION AGE; AGE OF MINERALIZATION 3646 1 16.69 0.5 adularia conventional K-Ar REO MINE "4.72E-04, 0.585E-04, 1.19E-04*" 15.57 3.758 85 ADULARIA HAS SANIDINE-FELDSPAR STRUCTURE ACCORDING TO X-RAY ANALYSIS AGE OF MINERALIZATION 3647 1 14.64 0.4 adularia conventional K-Ar CROWN MINE "4.72E-04, 0.585E-04, 1.19E-04*" 12.48 2.641 64 ADULARIA HAS SANIDINE-FELDSPAR STRUCTURE ACCORDING TO X-RAY ANALYSIS AGE OF MINERALIZATION 3648 1 74.95 2 microcline conventional K-Ar BLACK CANYON MINE "4.72E-04, 0.585E-04, 1.19E-04*" 15.32 16.88 95 MINIMUM AGE OF MINERALIZATION BECAUSE OF POSSIBLE LOSS OF ARGON BY MICROCLINE 3649 1 14.03 0.4 orthoclase conventional K-Ar KINDEGARTEN MINE "4.72E-04, 0.585E-04, 1.19E-04*" 11.58 2.349 80 AGE OF MINERALIZATION 3650 1 22.11 0.6 orthoclase conventional K-Ar NEVADA WONDER MINE "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 2.46 81 AGE OF MINERALIZATION 3651 1 109.71 4 hornblende conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.743 1.21 80 minimum age of intrusion BETTER THAN 99% PURE; NO BIOTITE PRESENT HORNBLENDE K-AR AGE MAY HAVE BEEN AFFECTED BY SUBSEQUENT THERMAL EVENT(S) 3651 2 83.4 3 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 10.2 88 age of later metamorphism BETTER THAN 99% PURE 3652 1 15.35 0.8 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.23 1.826 4359 AGE APPEARS TOO YOUNG 3652 2 22.36 1.2 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 10.66 3.453 6176 minimum age of volcanism AGE APPEARS TOO YOUNG 3653 1 26.74 0.8 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 3.304 75 age of volcanism AGE ALSO PUBLISHED BY MARVIN (1968) 3653 2 25.31 0.7 sanidine conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 4.56 1.673 85 minimum age of volcanism AGE ALSO PUBLISHED BY MARVIN (1968) 3654 1 35.15 0.9 sanidine conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 12.56 6.419 97 age of intrusion 3655 1 36.37 1.1 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.23 4.353 6467 age of volcanism 3655 2 33.37 1 sanidine conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 11.97 5.805 8995 AGE APPEARS TOO YOUNG 3656 1 25.57 1.5 glass conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 4.79 1.776 84 minimum age of volcanism NONHYDRATED 3657 1 21.22 1 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.72 2.372 4049 age of volcanism 3657 2 21.35 1 sanidine conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 10.52 3.253 8844 age of volcanism 3658 1 22.23 0.8 sanidine conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 10.49 3.378 6866 age of volcanism 3659 1 29.49 1.1 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 3.553 4952 age of volcanism 3659 2 28.24 1 sanidine conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 11.42 4.679 8272 age of volcanism 3660 1 33.58 1.3 biotite conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 4.118 7268 age of volcanism 3660 2 31.63 0.9 sanidine conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 11.72 5.384 8848 age of volcanism 3661 1 38.31 1.3 biotite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 4.604 6162 age of volcanism 3662 1 32.1 0.9 biotite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.94 4.169 8052 age of volcanism 3663 1 26.65 1.8 biotite conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.35 3.228 38 age of volcanism 3664 1 31.62 1.1 biotite conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 3.858 6236 age of volcanism 3664 2 30.83 0.9 sanidine conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 11.96 5.354 7658 age of volcanism 3665 1 30.92 0.9 biotite conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 8.41 3.776 6361 age of volcanism 3665 2 30.56 0.9 sanidine conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 11.67 5.179 8082 age of volcanism 3666 1 10.48 0.9 whole rock conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 1.62 0.2452 2123 age of volcanism 3667 1 31.45 0.9 biotite conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 3.891 5755 age of volcanism 3667 2 30.65 0.9 sanidine conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 11.47 5.104 9082 age of volcanism 3668 1 31.34 1.1 biotite conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 3.678 1675 age of volcanism 3669 1 24.03 1.6 biotite conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 2.915 5560 age of volcanism 3670 1 30.27 1 biotite conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 8.46 3.718 86 age of volcanism USGS ANALYSIS 3670 2 31.67 1 biotite conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 4.002 62 age of volcanism GEOCHRON LABORATORIES ANALYSIS 3670 3 28.16 1.1 sanidine conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 11.3 4.618 96 age of volcanism USGS ANALYSIS 3670 4 29.91 0.7 sanidine conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 11.3 4.906 7763 age of volcanism GEOCHRON LABORATORIES ANALYSIS 3671 1 28.88 1.8 biotite conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 8.18 3.428 6879 age of volcanism 3671 2 14.77 0.7 sanidine conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 10.43 2.227 5159 SPURIOUS AGE 3672 1 29.36 2 biotite conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 3.503 6678 age of volcanism 3673 1 25.87 1 biotite conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 2.952 4845 age of volcanism 3673 2 24.76 0.9 sanidine conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 12.13 4.353 7185 age of volcanism 3674 1 20.97 1.2 biotite conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 2.502 6970 AGE APPEARS TOO YOUNG 3674 2 23.28 0.9 sanidine conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 11.79 3.978 9287 minimum age of volcanism 3675 1 29.43 1.3 biotite conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 8.61 3.678 3672 age of volcanism GEOCHRON LABORATORIES ANALYSIS 3675 2 27.01 1 biotite conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 8.83 3.46 89 age of volcanism USGS ANALYSIS 3675 3 29.05 0.8 sanidine conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 12.1 5.102 94 age of volcanism USGS ANALYSIS 3676 1 5.85 0.2 whole rock conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 1.465 0.1236 51 age of volcanism 3677 1 19.26 0.8 sanidine conventional K-Ar 35 "4.72E-04, 0.585E-04, 1.19E-04*" 12.12 3.378 6972 age of intrusion 3678 1 25.94 1.1 biotite conventional K-Ar 36 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 3.114 85 age of volcanism 3678 2 25.49 0.6 sanidine conventional K-Ar 36 "4.72E-04, 0.585E-04, 1.19E-04*" 11.72 4.331 96 age of volcanism 3679 1 26.78 1.3 glass conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 4.83 1.876 8485 age of volcanism NONHYDRATED 3680 1 26.04 0.6 biotite conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 3.24 77 age of volcanism AGE ALSO PUBLISHED BY MARVIN (1968) 3680 2 24.44 0.6 sanidine conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 5.42 1.92 85 age of volcanism AGE ALSO PUBLISHED BY MARVIN (1968) 3681 1 24.27 1 biotite conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 7.61 2.677 554819 age of volcanism ARGON VALUE IS AVERAGE OF 3 ANALYSES 3681 2 22.81 0.8 sanidine conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 10.75 3.553 2021 age of volcanism 3682 1 26.11 1.3 biotite conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 8.46 3.203 7274 age of volcanism 3683 1 28.31 0.9 biotite conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 7.54 3.097 6370 age of volcanism GEOCHRON LABORATORIES ANALYSIS 3683 2 26.18 1 biotite conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 2.973 87 age of volcanism USGS ANALYSIS 3683 3 22.56 0.7 sanidine conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 11.36 3.713 8690 minimum age of volcanism GEOCHRON LABORATORIES ANALYSIS 3683 4 23.06 0.6 sanidine conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 11.72 3.916 97 minimum age of volcanism USGS ANALYSIS 3684 1 30.65 1.2 biotite conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 3.756 7472 age of volcanism GEOCHRON LABORATORIES ANALYSIS 3684 2 30.57 1 biotite conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 3.649 87 age of volcanism USGS ANALYSIS 3684 3 27.82 1.1 sanidine conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 11.63 4.694 9092 age of volcanism GEOCHRON LABORATORIES ANALYSIS 3684 4 30.39 0.7 sanidine conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 11.48 5.066 96 age of volcanism USGS ANALYSIS 3685 1 27.65 0.8 biotite conventional K-Ar 44 "4.72E-04, 0.585E-04, 1.19E-04*" 8.85 3.55 8789 age of volcanism 3686 1 32.49 0.9 biotite conventional K-Ar 45 "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 3.918 7771 age of volcanism 3686 2 32.79 1.4 sanidine conventional K-Ar 45 "4.72E-04, 0.585E-04, 1.19E-04*" 12.29 5.855 6867 age of volcanism 3687 1 31.23 0.9 biotite conventional K-Ar 46 "4.72E-04, 0.585E-04, 1.19E-04*" 7.96 3.61 7270 age of volcanism 3687 2 29.3 0.9 sanidine conventional K-Ar 46 "4.72E-04, 0.585E-04, 1.19E-04*" 11.69 4.971 7690 age of volcanism 3688 1 12.5 0.4 biotite conventional K-Ar 60A "4.72E-04, 0.585E-04, 1.19E-04" 7.66 1.71 62 age of volcanism (*) 3689 1 19.92 0.9 sanidine conventional K-Ar 63 "4.72E-04, 0.585E-04, 1.19E-04*" 6.45 1.86 57 age of volcanism 3690 1 23.37 1.3 sanidine conventional K-Ar 64 "4.72E-04, 0.585E-04, 1.19E-04*" 5.7 1.93 40 age of volcanism 3691 1 2.1 0.6 whole rock conventional K-Ar 71 "4.72E-04, 0.585E-04, 1.19E-04*" 1.82 0.055 23 age of volcanism 3692 1 23.12 0.7 biotite conventional K-Ar 94 "4.72E-04, 0.585E-04, 1.19E-04*" 8.21 2.75 60 age of volcanism AGE ALSO PUBLISHED BY MARVIN (1968) 3693 1 34.84 1.3 biotite conventional K-Ar 95 "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 4.33 74 age of volcanism 3694 1 13.04 0.5 sanidine conventional K-Ar 117 "4.72E-04, 0.585E-04, 1.19E-04*" 9.02 1.7 95 age of volcanism 3695 1 14.38 0.2 biotite conventional K-Ar 120 "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 1.804 82 age of volcanism 3696 1 13.96 0.2 biotite conventional K-Ar 121 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 1.671 74 age of volcanism 3697 1 13.48 0.2 biotite conventional K-Ar 122 "4.72E-04, 0.585E-04, 1.19E-04*" 7.93 1.545 67 age of volcanism 3698 1 14.03 0.2 biotite conventional K-Ar 123 "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 1.732 76 age of volcanism 3699 1 12.3 0.4 whole rock conventional K-Ar 124 "4.72E-04, 0.585E-04, 1.19E-04*" 4.78 0.8491 age of volcanism 3700 1 13.9 0.3 biotite conventional K-Ar 125 "4.72E-04, 0.585E-04, 1.19E-04*" 7.64 1.535 50 age of volcanism 3701 1 31.66 3 biotite conventional K-Ar 131 "4.72E-04, 0.585E-04, 1.19E-04*" 6.96 3.2 62 age of volcanism AGE ALSO PUBLISHED BY MARVIN (1968) 3702 1 34.42 1.2 biotite conventional K-Ar 134 "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 4.043 5740 GEOCHRON LABORATORIES ANALYSIS AGE APPEARS TOO OLD 3702 2 29.41 1.8 hornblende conventional K-Ar 134 "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.3671 74 age of volcanism USGS ANALYSIS 3703 1 34.04 1.2 sanidine conventional K-Ar 135 "4.72E-04, 0.585E-04, 1.19E-04*" 10.12 5.006 8476 AGE APPEARS TOO OLD IN COMPARISON WITH OTHER AGES IN STRATIGRAPHIC SEQUENCE 3704 1 20.06 0.8 sanidine conventional K-Ar 140 "4.72E-04, 0.585E-04, 1.19E-04*" 10.81 3.14 91 age of volcanism THE RESULTS OF THIS SAME ANALYSIS IS REPORTED AS 19.6+/-2.8 IN EKRON AND OTHERS (1977) 3705 1 25.99 1 sanidine conventional K-Ar 146 "4.72E-04, 0.585E-04, 1.19E-04*" 4.75 1.79 82 age of volcanism 3706 1 15.49 0.6 sanidine conventional K-Ar 147 "4.72E-04, 0.585E-04, 1.19E-04*" 6.52 1.46 72 age of volcanism 3707 1 13.29 0.2 biotite conventional K-Ar 155 "4.72E-04, 0.585E-04, 1.19E-04*" 7.66 1.471 75 age of volcanism 3708 1 13.42 0.2 biotite conventional K-Ar 158 "4.72E-04, 0.585E-04, 1.19E-04*" 6.39 1.239 78 age of volcanism 3709 1 10.19 0.5 whole rock conventional K-Ar 167 "4.72E-04, 0.585E-04, 1.19E-04*" 5.83 0.858 12 age of volcanism 3710 1 12.62 0.4 whole rock conventional K-Ar 172 "4.72E-04, 0.585E-04, 1.19E-04*" 2.45 0.4466 60 age of volcanism 3711 1 12.79 0.2 biotite conventional K-Ar 173 "4.72E-04, 0.585E-04, 1.19E-04*" 6.21 1.148 71 age of volcanism 3712 1 14.19 0.2 biotite conventional K-Ar 176 "4.72E-04, 0.585E-04, 1.19E-04*" 8 1.641 57 age of volcanism 3713 1 15.74 0.47 hornblende conventional K-Ar KA2493 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7891 0.1796 41 age of volcanism 3714 1 12.41 0.39 plagioclase conventional K-Ar KA2362 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6478 0.1161 41 age of volcanism 3714 2 12.36 0.5 hornblende conventional K-Ar KA2364 "4.72E-04, 0.585E-04, 1.19E-04*" 0.742 0.1325 29 age of volcanism 3714 3 12.64 0.31 biotite conventional K-Ar KA2368 "4.72E-04, 0.585E-04, 1.19E-04*" 7.376 1.3469 31 age of volcanism 3715 1 12.73 0.17 biotite conventional K-Ar KA2372 "4.72E-04, 0.585E-04, 1.19E-04*" 6.612 1.2161 42 age of intrusion 3715 2 13.25 0.45 hornblende conventional K-Ar KA2373 "4.72E-04, 0.585E-04, 1.19E-04*" 0.76 0.1456 36 age of intrusion 3716 1 11.69 0.54 biotite conventional K-Ar KA2379R "4.72E-04, 0.585E-04, 1.19E-04*" 7.362 1.2426 18 age of volcanism 3717 1 13.29 0.39 plagioclase conventional K-Ar KA2375 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6311 0.1212 46 age of volcanism 3717 2 12 0.5 hornblende conventional K-Ar KA2380 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8059 0.1147 28 age of volcanism (*) 3718 1 12 0.34 plagioclase conventional K-Ar KA2381 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6981 0.121 49 age of volcanism 3718 2 13.17 0.67 hornblende conventional K-Ar KA2440 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7032 0.1338 22 age of volcanism 3719 1 10.98 1.45 plagioclase conventional K-Ar KA2438 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5004 0.0793 8 minimum age of volcanism AGE APPEARS LOW 3719 2 13.49 0.45 hornblende conventional K-Ar KA2503 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7942 0.1548 36 age of volcanism 3720 1 11.8 0.24 hornblende conventional K-Ar KA2501 "4.72E-04, 0.585E-04, 1.19E-04*" 0.868 0.148 64 age of volcanism 3720 2 9.84 0.09 biotite conventional K-Ar KA2434 "4.72E-04, 0.585E-04, 1.19E-04*" 7.983 1.1342 61 AGE APPEARS SOMEWHAT LOW 3721 1 11.79 0.52 plagioclase conventional K-Ar KA2581 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7427 0.1265 26 age of volcanism 3722 1 9.74 0.44 plagioclase conventional K-Ar KA2431 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7289 0.1025 29 age of volcanism 3722 2 10.87 0.49 hornblende conventional K-Ar KA2432 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7805 0.1225 25 age of volcanism 3723 1 9.68 0.44 hornblende conventional K-Ar KA2439 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6671 0.0932 24 age of volcanism 3724 1 6.98 0.3 whole rock conventional K-Ar KA2341 "4.72E-04, 0.585E-04, 1.19E-04*" 2.426 0.2443 19 age of volcanism 3725 1 6.93 0.06 whole rock conventional K-Ar KA2365 "4.72E-04, 0.585E-04, 1.19E-04*" 2.197 0.2195 64 age of volcanism 3726 1 6.74 0.27 whole rock conventional K-Ar KA2366 "4.72E-04, 0.585E-04, 1.19E-04*" 2.562 0.2489 20 age of volcanism 3727 1 6.75 0.12 whole rock conventional K-Ar KA2367 "4.72E-04, 0.585E-04, 1.19E-04*" 2.296 0.2235 41 age of volcanism 3728 1 7.38 0.07 whole rock conventional K-Ar KA2369 "4.72E-04, 0.585E-04, 1.19E-04*" 2.096 0.223 66 age of volcanism 3729 1 7.84 0.15 whole rock conventional K-Ar KA2496 "4.72E-04, 0.585E-04, 1.19E-04*" 1.9498 0.2206 42 age of volcanism 3730 1 7.54 0.24 whole rock conventional K-Ar KA2497 "4.72E-04, 0.585E-04, 1.19E-04*" 1.667 0.1812 25 age of volcanism 3731 1 7.67 0.3 whole rock conventional K-Ar KA2582 "4.72E-04, 0.585E-04, 1.19E-04*" 1.269 0.1403 26 age of volcanism 3732 1 7.57 0.24 biotite conventional K-Ar KA2370 "4.72E-04, 0.585E-04, 1.19E-04*" 7.556 0.8255 25 age of volcanism 3732 2 5.85 0.06 sanidine - plagioclase conventional K-Ar KA2502 "4.72E-04, 0.585E-04, 1.19E-04*" 3.113 0.2625 60 minimum age of volcanism 3733 1 7.21 0.12 biotite conventional K-Ar KA2435 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9563 0.827 42 age of volcanism 3733 2 6.82 0.34 sanidine - plagioclase conventional K-Ar KA2437 "4.72E-04, 0.585E-04, 1.19E-04*" 4.563 0.4488 17 age of volcanism 3734 1 7.32 0.16 biotite conventional K-Ar KA2428R "4.72E-04, 0.585E-04, 1.19E-04*" 7.71 0.814 33 age of volcanism 3734 2 6.09 0.05 sanidine - plagioclase conventional K-Ar KA2427 "4.72E-04, 0.585E-04, 1.19E-04*" 5.039 0.4425 74 minimum age of volcanism 3735 1 5.91 0.7 plagioclase conventional K-Ar KA2494 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8054 0.0686 9 age of volcanism 3736 1 6.94 0.05 biotite conventional K-Ar KA2436 "4.72E-04, 0.585E-04, 1.19E-04*" 8.631 0.8636 60 age of volcanism 3737 1 5.02 0.26 hornblende conventional K-Ar KA2491 "4.72E-04, 0.585E-04, 1.19E-04" 0.8872 0.042 21 age of volcanism (*) 3737 2 5.13 0.35 biotite conventional K-Ar KA2513 "4.72E-04, 0.585E-04, 1.19E-04*" 6.991 0.5169 13 age of volcanism 3738 1 10.82 0.3 adularia conventional K-Ar USGS(M)-TA-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.15 1.273 2327 AGE OF MINERALIZATION 3739 1 32.61 1.2 biotite conventional K-Ar UCMP D-3426 "4.72E-04, 0.585E-04, 1.19E-04*" 8.423 3.991 6971 age of volcanism "THIS AGE IS NEAR THE UPPER LIMIT OF THE CHADRONIAN NORTH AMERICAN LAND MAMMAL AGE (EVERNDEN AND OTHERS, 1964)" 3740 1 129.9 3 biotite conventional K-Ar YAG 767 "4.72E-04, 0.584E-04, 1.19E-04*" 8.38 16.25 90 age of intrusion "AGREES WITH 124 M.Y. DATE BY MCDOWELL, 1966, BUT NOT WITH 150 M.Y. DATE REPORTED BY COATS AND OTHERS, 1965" 3741 1 153.1 3 biotite conventional K-Ar YAG 86 "4.72E-04, 0.584E-04, 1.19E-04*" 4.46 10.26 89 age of intrusion A BIOTITE-HORNBLENDE MIXTURE 3742 1 157.07 3 biotite - muscovite conventional K-Ar YAG 85 "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 20.65 82 age of intrusion 5% CHLORITE PRESENT 3743 1 154.18 3 biotite conventional K-Ar YAG 133 "4.72E-04, 0.584E-04, 1.19E-04*" 6.87 15.92 83 age of volcanism 7% GROUNDMASS PRESENT 3744 1 136.73 3 hornblende conventional K-Ar YAG 131 "4.72E-04, 0.584E-04, 1.19E-04*" 0.489 1 4051 minimum age of intrusion 5% CHLORITE AND 5% ROCK IMPURITIES PRESENT "THE LOW AGE MAY BE DUE TO ""DUTERIC"" ALTERATION" 3745 1 127.58 3 hornblende conventional K-Ar YAG 127 "4.72E-04, 0.584E-04, 1.19E-04*" 0.403 0.767 3842 minimum age of intrusion 3% CHLORITE AND 5% ROCK IMPURITIES PRESENT "LOW AGE MAY BE DUE TO ""DUTERIC"" ALTERATION" 3746 1 143.95 3 hornblende conventional K-Ar YAG 126 "4.72E-04, 0.584E-04, 1.19E-04*" 0.89 1.92 46 minimum age of intrusion 2% CHLORITE AND 5% ROCK PRESENT 3747 1 108.51 2 hornblende conventional K-Ar YAG 38 "4.72E-04, 0.584E-04, 1.19E-04*" 2.36 3.8 84 age of intrusion 4% BIOTITE AND 3% ROCK PRESENT "AGREES WITH 109 M.Y. DATE OF MCDOWELL AND KULP, 1967" 3748 1 108.65 2 muscovite conventional K-Ar YAG 181 "4.72E-04, 0.584E-04, 1.19E-04*" 11.27 18.17 87 K-AR AGE HAS BEEN REDUCED BY A TERTIARY THERMAL 3749 1 67.73 1.4 muscovite conventional K-Ar YAG 184 "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 8.237 77 5% BIOTITE AND 7% CHLORITE PRESENT AGE HAS BEEN REDUCED BY SOME RECENT THERMAL EVENT 3750 1 113.47 2 muscovite - biotite conventional K-Ar YAG 190M "4.72E-04, 0.584E-04, 1.19E-04*" 7.74 13.05 79 5% CHLORITE AND 5% ROCK PRESENT AGE IS PROBABLY A HYBRID AGE DUE TO A TERTIARY THERMAL EVENT--THRUST FAULTING 3751 1 84.54 1 muscovite conventional K-Ar YAG 186 "4.72E-04, 0.584E-04, 1.19E-04*" 10.04 12.51 82 AGE IS PROBABLY A HYBRID AGE 3752 1 83.65 1.6 muscovite conventional K-Ar YAG 187 "4.72E-04, 0.584E-04, 1.19E-04*" 9.63 11.87 82 5% ROCK PRESENT PROBABLY A HYBRID AGE 3753 1 12.48 hornblende conventional K-Ar 66C422 "4.72E-04, 0.584E-04, 1.19E-04*" 0.517 0.0932 23 age of volcanism 3754 1 12.96 biotite conventional K-Ar 67W85 "4.72E-04, 0.584E-04, 1.19E-04*" 8.28 1.55 50 age of intrusion 3755 1 12.22 hornblende conventional K-Ar 67W86 "4.72E-04, 0.584E-04, 1.19E-04*" 0.748 0.132 33 age of volcanism 3756 1 18.08 hornblende conventional K-Ar 66CH213 "4.72E-04, 0.584E-04, 1.19E-04*" 0.558 0.146 34 age of volcanism 3757 1 21.68 hornblende conventional K-Ar 66CH159 "4.72E-04, 0.584E-04, 1.19E-04*" 0.742 0.233 36 age of intrusion 3758 1 27.61 hornblende conventional K-Ar 67W152 "4.72E-04, 0.584E-04, 1.19E-04*" 0.644 0.258 39 age of volcanism 3759 1 137.45 1.5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.691 17.87 92 age of intrusion "FRESH, UNALTERED BIOTITE" 3760 1 139.3 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.691 18.12 85 age of intrusion FRESH BIOTITE FROM DIAMOND DRILL-CORE 3761 1 90.01 3.4 sericite conventional K-Ar KIR-114 "4.72E-04, 0.585E-04, 1.19E-04*" 4.87 6.471 6357 2M(SUB 1) MUSCOVITE AGE OF MINERALIZATION & ALTERATION 3762 1 90.79 3.3 sericite conventional K-Ar MAR-103 "4.72E-04, 0.585E-04, 1.19E-04*" 8.69 11.65 7079 2M(SUB 1) MUSCOVITE AGE OF MINERALIZATION & ALTERATION 3763 1 94.74 2.8 sericite conventional K-Ar MB55 "4.72E-04, 0.585E-04, 1.19E-04*" 9.19 12.87 97 age of intrusion 2M(SUB 1) MUSCOVITE ALSO AGE OF MINERALIZATION AND ALTERATION(?) 3764 1 94.44 2.8 sericite conventional K-Ar SEC. 4 "4.72E-04, 0.585E-04, 1.19E-04*" 10.33 14.42 98 age of intrusion 2M(SUB 1) MUSCOVITE ALSO AGE OF MINERALIZATION AND ALTERATION(?) 3765 1 76.5 2.2 orthoclase conventional K-Ar GL-3A "4.72E-04, 0.585E-04, 1.19E-04*" 14.39 16.19 96 age meaning uncertain (geologic factors) 3765 2 68.68 2 sericite conventional K-Ar GL-3A "4.72E-04, 0.585E-04, 1.19E-04*" 9.17 9.242 86 age meaning uncertain (geologic factors) "FINE GRAINED, LESS THAN 0.01 MM" 3765 3 82.86 3.3 sericite conventional K-Ar GL-3A "4.72E-04, 0.585E-04, 1.19E-04*" 5.94 7.251 89 age meaning uncertain (geologic factors) COARSE-GRAINED 0.1 TO 0.6 MM 3766 1 14.5 1.4 glass conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.06 1.27 24 minimum age of volcanism AGE MAY BE TOO YOUNG 3766 2 16.65 1.3 sanidine conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 7.31 1.76 31 age of volcanism 3766 3 22.83 1.8 K feldspar conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 5.35 1.77 31 AUTHORS CONSIDER THIS AGE UNREASONABLE WHEN COMPARED WITH AGES OF OTHER VOLCANIC UNITS 3767 1 17.1 1.5 plagioclase conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.54 0.1334 14 age of volcanism 3768 1 25.4 2 plagioclase conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.52 0.1907 7 maximum age of volcanism AGE MAY BE CONSIDERABLY TOO OLD 3769 1 16.47 0.5 K feldspar conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 6.13 1.46 70 age of volcanism 3770 1 18.33 0.5 K feldspar conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 5.43 1.44 70 age of volcanism 3771 1 18.33 0.5 sanidine conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 2.18 71 age of volcanism 3772 1 18.08 0.5 K feldspar conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 2.37 0.62 56 age of volcanism 3773 1 18.01 0.5 K feldspar conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 5.45 1.42 67 age of volcanism 3774 1 13.9 0.6 glass conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 4.5 0.909 11 age of intrusion NONHYDRATED 3776 1 14.82 0.7 biotite conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 7.98 1.71 14 age of volcanism 3777 1 15.21 0.7 biotite conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 7.96 1.75 77 age of volcanism 3777 2 14.07 1.7 hornblende conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 0.88 0.179 61 age of volcanism 3778 1 28.62 0.8 biotite conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 7.03 2.92 30 age of volcanism 3779 1 15.14 0.5 plagioclase conventional K-Ar 31 "4.72E-04, 0.585E-04, 1.19E-04*" 1.32 0.289 76 age of volcanism 3780 1 30.4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3781 1 99 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3782 1 27.12 0.7 biotite conventional K-Ar LFL-66-GLD-71 "4.72E-04, 0.585E-04, 1.19E-04*" 7.645 3.008 76 age of volcanism POTASSIUM VALUE DETERMINED BY ISOTOPE DILUTION ANALYTICAL DATA CAME FROM MARVIN AND COLE (1978). NEW DECAY CONSTANTS CHANGE THE AGE TO 27.1 M.Y. 3783 1 65.09 1.2 muscovite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 10.475 9.995 82 initial age disturbed by later metamorphism "8.70, 8.69% K" 3784 1 48.35 1 muscovite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 10.246 7.228 80 initial age disturbed by later metamorphism "8.50, 8.51% K" 3785 1 34.46 1 biotite conventional K-Ar W1421 "4.72E-04, 0.585E-04, 1.19E-04*" 8.59 4.303 89 age of intrusion 3785 2 33.65 1 sanidine conventional K-Ar W1421 "4.72E-04, 0.585E-04, 1.19E-04*" 12.46 6.093 76 age of intrusion 3786 1 32.89 1 biotite conventional K-Ar W1416 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 4.009 81 age of volcanism 3786 2 33.57 1 sanidine conventional K-Ar W1416 "4.72E-04, 0.585E-04, 1.19E-04*" 11.19 5.459 90 age of volcanism 3787 1 32.3 Unk (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism 3790 1 39.4 1.5 adularia conventional K-Ar USGS(M)01063(67NC13) "4.72E-04, 0.585E-04, 1.19E-04*" 14.82 8.5 75 AGE OF MINERALIZATION 3791 1 41 biotite (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3792 1 26.76 0.8 sanidine conventional K-Ar USGS RM1 "4.72E-04, 0.585E-04, 1.19E-04*" 12.26 4.758 76 age of volcanism 3793 1 16.41 0.5 adularia conventional K-Ar USGS-DRS 120-68 "4.72E-04, 0.585E-04, 1.19E-04*" 15.97 3.79 90 SANIDINE STRUCTURE AGE OF MINERALIZATION; THIS AGE ALSO PUBLISHED BY SILBERMAN AND MCKEE (1974) WITHOUT DEFINITE LOCATION OR ANALYTICAL DATA 3794 1 25.88 0.8 adularia conventional K-Ar USGS-DRS 146-68 "4.72E-04, 0.585E-04, 1.19E-04*" 15.76 5.915 72 SANIDINE STRUCTURE AGE OF MINERALIZATION; THIS AGE ALSO PUBLISHED BY SILBERMAN AND MCKEE (1974) WITHOUT DEFINITE LOCATION OR ANALYTICAL DATA 3795 1 128.68 4 muscovite conventional K-Ar CAN-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.28 17.82 96 AGE OF ALTERATION (MINERALIZATION) 3796 1 23.38 0.7 sanidine conventional K-Ar CAN-3 "4.72E-04, 0.585E-04, 1.19E-04*" 11.18 3.788 98 age of volcanism 3797 1 4.03 0.4 whole rock conventional K-Ar CAN-2 "4.72E-04, 0.585E-04, 1.19E-04*" 2.12 0.1231 1520 minimum age of volcanism TWO ARGON ANALYSES 3798 1 8.75 0.3 whole rock conventional K-Ar 2701-2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.69 0.2135 51 age of volcanism 3799 1 14.96 0.4 biotite conventional K-Ar R-11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.09 1.75 69 age of volcanism 3799 2 15.05 0.4 sanidine conventional K-Ar R-11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.93 1.943 90 age of volcanism 3800 1 15.93 0.5 muscovite conventional K-Ar R-7 "4.72E-04, 0.585E-04, 1.19E-04*" 6.07 1.398 70 MINIMUM AGE OF ALTERATION 3801 1 15.72 0.5 biotite conventional K-Ar CD-31 "4.72E-04, 0.585E-04, 1.19E-04*" 9.1 2.068 47 age of volcanism 3801 2 16.12 0.7 plagioclase conventional K-Ar CD-31 "4.72E-04, 0.585E-04, 1.19E-04*" 1.17 0.2727 34 age of volcanism 3802 1 15.43 0.5 adularia conventional K-Ar CD-8 "4.72E-04, 0.585E-04, 1.19E-04*" 9.8 2.187 71 ORTHOCLASE STRUCTURE DETERMINED BY X-RAY AGE OF MINERALIZATION 3803 1 158.94 3 biotite conventional K-Ar MB43 "4.72E-04, 0.585E-04, 1.19E-04*" 9.08 21.72 94 age not evaluated 3803 2 171.97 3 hornblende conventional K-Ar MB43 "4.72E-04, 0.585E-04, 1.19E-04*" 0.701 1.821 87 age of intrusion 3804 1 8.41 0.6 whole rock conventional K-Ar E-15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.2 0.0243 13 age of volcanism 3805 1 8.01 0.5 whole rock conventional K-Ar 54NC93 "4.72E-04, 0.585E-04, 1.19E-04*" 0.19 0.022 20 age of volcanism 3806 1 10.87 1 whole rock conventional K-Ar 61NC18 "4.72E-04, 0.585E-04, 1.19E-04*" 0.35 0.0549 7 age of intrusion 3807 1 8.69 0.7 whole rock conventional K-Ar 6238-2J "4.72E-04, 0.585E-04, 1.19E-04*" 0.34 0.0427 10 age of volcanism 3808 1 23.04 0.7 biotite conventional K-Ar 6-147 "4.72E-04, 0.585E-04, 1.19E-04*" 8.245 2.753 62 age of volcanism 3809 1 14.76 0.4 plagioclase conventional K-Ar 6-144 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3395 0.0725 46 age of volcanism 3810 1 15.24 0.4 hornblende conventional K-Ar May-71 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6065 0.1336 20 age of intrusion 3810 2 14.51 0.4 biotite conventional K-Ar May-71 "4.72E-04, 0.585E-04, 1.19E-04*" 8.03 1.684 53 age of intrusion 3811 1 14.16 0.3 biotite conventional K-Ar 5-267 "4.72E-04, 0.585E-04, 1.19E-04*" 5.97 1.222 60 age of volcanism 3812 1 14.01 1.6 hornblende conventional K-Ar Apr-57 "4.72E-04, 0.585E-04, 1.19E-04*" 0.523 0.1059 8 minimum age of volcanism 3813 1 13.01 0.4 biotite conventional K-Ar 6-153 "4.72E-04, 0.585E-04, 1.19E-04*" 6.54 1.229 57 age of intrusion 3813 2 13.24 0.4 hornblende conventional K-Ar 6-153 "4.72E-04, 0.585E-04, 1.19E-04*" 0.58 0.111 37 age of intrusion 3814 1 12.73 0.3 biotite conventional K-Ar 96-159 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 1.508 41 age of intrusion 3815 1 12.63 0.2 biotite conventional K-Ar 99-157 "4.72E-04, 0.585E-04, 1.19E-04*" 7.38 1.347 65 age of volcanism 3816 1 14.08 0.4 adularia conventional K-Ar May-89 "4.72E-04, 0.585E-04, 1.19E-04*" 15.82 3.22 91 AGE OF MINERALIZATION 3817 1 13.15 0.4 adularia conventional K-Ar May-41 "4.72E-04, 0.585E-04, 1.19E-04*" 16.14 3.066 70 AGE OF MINERALIZATION 3819 1 31.97 1 sanidine conventional K-Ar SR-476 "4.72E-04, 0.585E-04, 1.19E-04*" 7.075 3.285 90 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 3820 1 32.65 1.1 whole rock conventional K-Ar SR-425 "4.72E-04, 0.585E-04, 1.19E-04*" 2.475 1.174 86 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 3821 1 38.5 1.3 biotite conventional K-Ar SR-377 "4.72E-04, 0.585E-04, 1.19E-04*" 6.6 3.698 85 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 3822 1 37.8 1 biotite conventional K-Ar SR-442 "4.72E-04, 0.585E-04, 1.19E-04*" 8.79 4.83 82 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 3822 2 36.3 1.1 sanidine conventional K-Ar SR-442 "4.72E-04, 0.585E-04, 1.19E-04*" 11.76 6.21 92 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 3824 1 27.1 0.9 biotite conventional K-Ar 267 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3825 1 28 1 biotite conventional K-Ar 675 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3825 2 25.1 1.8 plagioclase conventional K-Ar 675 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 3826 1 27.8 1 biotite conventional K-Ar 661 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3826 2 26.1 0.9 sanidine conventional K-Ar 661 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 3827 1 27.2 1.1 biotite conventional K-Ar S-29 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3827 2 31.7 1.8 hornblende conventional K-Ar S-29 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3828 1 24.1 0.9 biotite conventional K-Ar 662 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3828 2 23.6 2 plagioclase conventional K-Ar 662 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3829 1 18.7 1.9 hornblende conventional K-Ar 671 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3829 2 17 2.5 plagioclase conventional K-Ar 671 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3830 1 17.7 2.4 hornblende conventional K-Ar 665 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3831 1 18.5 2.5 hornblende conventional K-Ar 602 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3831 2 18.9 2.8 plagioclase conventional K-Ar 602 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3832 1 18.7 2.5 hornblende conventional K-Ar 664 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3832 2 18.5 2.7 plagioclase conventional K-Ar 664 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3832 3 14.2 0.6 biotite conventional K-Ar 664 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE SEEMS RATHER LOW IN COMPARISON WITH HORNBLENDE AND PLAGIOCLASE AGES 3833 1 28.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 3834 1 164.39 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 19.03 90 age of intrusion 3835 1 164.04 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 22.4 92 age of intrusion 3837 1 22.73 0.6 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.17 2.69 67 age of volcanism 3838 1 24.32 0.6 sanidine conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 10.47 3.69 84 age of volcanism 3839 1 28.4 0.7 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.3 3.42 78 age of volcanism 3840 1 31.38 0.8 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 3.5 71 age of volcanism 3841 1 30.8 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 3.39 54 age of volcanism 3842 1 31.87 0.8 sanidine conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 9.96 4.61 85 age of volcanism 3843 1 32.06 0.8 sanidine conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 12.09 5.63 91 age of volcanism 3844 1 33.13 0.8 sanidine conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 10.2 4.91 92 age of volcanism 3845 1 14.14 0.8 biotite conventional K-Ar 62NC130 "4.72E-04, 0.585E-04, 1.19E-04*" 9.01 1.841 91 age of volcanism 3846 1 40.6 2 sanidine conventional K-Ar 62NC55 "4.72E-04, 0.585E-04, 1.19E-04*" 11.03 6.52 62 age of volcanism 3847 1 15.93 0.7 plagioclase conventional K-Ar 62NC182 "4.72E-04, 0.585E-04, 1.19E-04*" 1.885 0.4343 80 age of volcanism "1.87%, 1.90% K2O" 3848 1 16.36 0.7 plagioclase conventional K-Ar 62NC181 "4.72E-04, 0.585E-04, 1.19E-04*" 2.825 0.6685 92 age of volcanism "2.75%, 2.90% K2O" 3849 1 34.23 3.3 biotite conventional K-Ar 59NC143 "4.72E-04, 0.585E-04, 1.19E-04*" 5.69 2.831 18 age of volcanism 3850 1 40.6 2 biotite conventional K-Ar 60NC81 "4.72E-04, 0.585E-04, 1.19E-04*" 8.61 5.09 80 age of volcanism 3851 1 16.59 0.7 plagioclase conventional K-Ar 62NC183 "4.72E-04, 0.585E-04, 1.19E-04*" 2.96 0.7101 78 age of volcanism "2.93%, 2.99% K2O" 3852 1 15.37 0.7 plagioclase conventional K-Ar 62NC184 "4.72E-04, 0.585E-04, 1.19E-04*" 3.66 0.8135 81 age of volcanism "3.62%, 3.70% K2O" 3853 1 41.06 1.2 biotite conventional K-Ar 65NC69 "4.72E-04, 0.585E-04, 1.19E-04*" 8 4.7832 80 age of volcanism 3854 1 43.44 1.5 biotite conventional K-Ar 65NC54 "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 5.33 65 age of volcanism "8.41%, 8.43% K2O" 3855 1 14.37 1.1 biotite conventional K-Ar 59NC89 "4.72E-04, 0.585E-04, 1.19E-04*" 4.84 1.005 22 LEACHED OR ALTERED BIOTITE "AGE VERY QUESTIONABLE, PROBABLY TOO YOUNG, DUE TO ALTERATION OF BIOTITE" 3856 1 30.85 1 sanidine conventional K-Ar 66NC81 "4.72E-04, 0.585E-04, 1.19E-04*" 10.56 4.73 87 age of volcanism "10.58%, 10.53% K2O" 3857 1 23.52 3 plagioclase conventional K-Ar 62NC46 "4.72E-04, 0.585E-04, 1.19E-04*" 0.2385 0.0813 11 age of volcanism "0.240%, 0.237% K2O" 3858 1 14.92 0.9 sanidine conventional K-Ar 62NC111 "4.72E-04, 0.585E-04, 1.19E-04*" 10.98 2.369 50 age of volcanism 3859 1 15.89 0.7 plagioclase conventional K-Ar 64NC73 "4.72E-04, 0.585E-04, 1.19E-04*" 2.965 0.6813 88 age of volcanism "2.97%, 2.96% K2O" 3860 1 44.71 2.2 biotite conventional K-Ar 63NC77 "4.72E-04, 0.585E-04, 1.19E-04*" 7.75 5.051 70 age of volcanism 3861 1 38.97 1.1 biotite conventional K-Ar 66NC109 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 4.963 81 age of volcanism 3862 1 42.88 1.5 biotite conventional K-Ar 57NC90 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 4.935 56 age of volcanism "7.81%, 7.99% K2O" 3863 1 15.76 0.5 sanidine conventional K-Ar 66NC20 "4.72E-04, 0.585E-04, 1.19E-04*" 6.785 1.546 44 age of volcanism "6.78%, 6.79% K2O" 3864 1 34.77 1 biotite conventional K-Ar 70NC106 "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 4.408 82 age of intrusion 3865 1 38.72 1.1 biotite conventional K-Ar 70NC101 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 4.727 72 age of intrusion 3866 1 15.35 0.4 adularia conventional K-Ar DRS-9-67 "4.72E-04, 0.585E-04, 1.19E-04*" 15.36 3.41 95 AGE OF MINERALIZATION 3867 1 32.95 1.1 sanidine conventional K-Ar 66NC148 "4.72E-04, 0.585E-04, 1.19E-04*" 12.16 5.822 67 age of volcanism 3868 1 40.26 1.2 biotite conventional K-Ar 71NC291 "4.72E-04, 0.585E-04, 1.19E-04*" 7.91 4.636 78 age of volcanism 3869 1 38.86 1 biotite conventional K-Ar 70NC96 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 4.638 90 age of volcanism 3870 1 34.44 1.6 biotite conventional K-Ar 68NC114 "4.72E-04, 0.585E-04, 1.19E-04*" 6.645 3.326 30 age of volcanism "6.63%, 6.66% K2O" 3871 1 36.3 1.1 biotite conventional K-Ar 68NC159 "4.72E-04, 0.585E-04, 1.19E-04*" 8.8 4.646 67 age of volcanism "8.80%, 8.80% K2O" 3872 1 42.13 1.2 biotite conventional K-Ar 67NC23 "4.72E-04, 0.585E-04, 1.19E-04*" 8.375 5.139 67 age of volcanism "8.38%, 8.37% K2O" 3873 1 39.39 1.1 adularia conventional K-Ar 67NC13 "4.72E-04, 0.585E-04, 1.19E-04*" 14.82 8.496 75 "14.87%, 14.77% K2O" AGE OF MINERALIZATION 3874 1 36.3 1 whole rock conventional K-Ar 70NC28 "4.72E-04, 0.585E-04, 1.19E-04*" 3.05 1.61 90 age of volcanism 3875 1 41.67 1.2 biotite conventional K-Ar 69NC41 "4.72E-04, 0.585E-04, 1.19E-04*" 8.63 5.238 85 age of volcanism 3876 1 37.18 1.1 biotite conventional K-Ar H-64-132 "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 4.797 75 age of volcanism "8.83%, 8.91% K2O" 3877 1 39.67 1.5 biotite conventional K-Ar H-64-49 "4.72E-04, 0.585E-04, 1.19E-04*" 8.745 5.05 86 age of volcanism "8.59%, 8.90% K2O" 3878 1 35.4 1.4 biotite conventional K-Ar B66-210 "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 4.318 62 age of volcanism "8.38%, 8.38% K2O" 3879 1 35.71 1 sanidine conventional K-Ar CB-64-43 "4.72E-04, 0.585E-04, 1.19E-04*" 10.18 5.286 88 age of volcanism "10.18%, 10.18% K2O" 3879 2 33.56 1 biotite conventional K-Ar CB-64-43 "4.72E-04, 0.585E-04, 1.19E-04*" 7.725 3.767 72 age of volcanism "7.67%, 7.78% K2O" 3880 1 34.51 1.3 plagioclase conventional K-Ar H-64-148 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4615 0.2315 49 age of volcanism "0.459%, 0.464% K2O" 3880 2 36.08 1 biotite conventional K-Ar H-64-148 "4.72E-04, 0.585E-04, 1.19E-04*" 7.43 3.898 89 age of volcanism "7.42%, 7.44% K2O" 3881 1 35.09 1.3 biotite conventional K-Ar B67-68 "4.72E-04, 0.585E-04, 1.19E-04*" 7.45 3.801 79 age of volcanism "7.37%, 7.44%, 7.54% K2O" 3882 1 35.1 1.3 biotite conventional K-Ar 62 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 3883 1 32.88 1.1 sanidine conventional K-Ar B69-54 "4.72E-04, 0.585E-04, 1.19E-04*" 12.6 6.02 85 age of volcanism 3884 1 22.42 0.8 biotite conventional K-Ar B67-52 "4.72E-04, 0.585E-04, 1.19E-04*" 8.97 2.913 62 age of volcanism "9.02%, 9.01%, 8.88% K2O" 3885 1 5.11 0.2 adularia conventional K-Ar 70-71A "4.72E-04, 0.585E-04, 1.19E-04*" 12.9 0.95 38 SANIDINE STRUCTURE AS DETERMINED BY X-RAY AGE OF MINERALIZATION 3886 1 56 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 3891 1 195.77 7 hornblende conventional K-Ar MC62 "4.72E-04, 0.585E-04, 1.19E-04*" 0.35 1.042 14 minimum age of metamorphic crystallization "ANALYTICAL DATA RELEASED BY E.H. MCKEE, USGS, MENLO PARK, CALIFORNIA" 3892 1 25.91 0.9 sanidine conventional K-Ar MC-74-BE-762A "4.72E-04, 0.585E-04, 1.19E-04*" 8.885 3.338 89 age of intrusion "8.90%, 8.87% K2O; ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 3893 1 150.8 3 biotite conventional K-Ar 97VV-368 "4.72E-04, 0.585E-04, 1.19E-04*" 7.15 16.19 90 minimum age of intrusion "7.13%, 7.16% K2O" FISSION-TRACK AGES OF 170 +/- 13 AND 19.6 +/- 2.7 REPORTED FOR THIS SAMPLE BY ASHLEY (1973) 3894 1 159.62 3 muscovite conventional K-Ar GS1-945 "4.72E-04, 0.585E-04, 1.19E-04*" 4.32 10.38 91 WHITE MICA WITH IMPURITIES "4.31%, 4.33% K20" MAY INDICATE TIME OF ALTERATION 3895 1 25 0.5 sanidine conventional K-Ar C21 "4.72E-04, 0.585E-04, 1.19E-04*" 12.26 4.44 92 minimum age of volcanism SANIDINE-BIOTITE MIXTURE(?) FISSION-TRACK AGES OF 31.1 +/- 2.2 AND 27.7 +/- 3.3 REPORTED FOR THIS SAMPLE BY ASHLEY (1973) 3901 1 20.83 0.8 biotite conventional K-Ar 228-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.74 2.335 20 age of volcanism "7.74%, 7.74% K2O" 3901 2 21.78 0.4 sanidine conventional K-Ar 228-2 "4.72E-04, 0.585E-04, 1.19E-04*" 11.87 3.745 53 age of volcanism "11.87%, 11.87% K2O" 3902 1 21.36 0.4 hornblende conventional K-Ar 166-64-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.95 0.2939 36 age of intrusion "0.947%, 0.953% K2O" 3903 1 14.95 2.4 plagioclase conventional K-Ar 164-69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.915 0.1977 8 age of volcanism "0.915%, 0.915% K2O" AGE OF 14.2 +/- 0.3 ON BIOTITE REPORTED FOR THIS SAMPLE IN SILBERMAN AND MCKEE (1972) 3904 1 16.44 0.3 sanidine conventional K-Ar 164-19 "4.72E-04, 0.585E-04, 1.19E-04*" 9.43 2.242 92 age of volcanism "9.43%, 9.43% K2O" 3905 1 13.06 0.3 biotite conventional K-Ar 51-12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.07 1.523 50 age of volcanism "8.07%, 8.07% K2O" 3906 1 10.68 1.3 whole rock conventional K-Ar 166-76 "4.72E-04, 0.585E-04, 1.19E-04*" 1.73 0.2668 32 age of volcanism "1.77%, 1.70%, 1.75%, 1.70% K2O; 0.3002 X E-10, 0.2334 X E-10 MOL/GM ARGON" 3907 1 10.64 1.4 whole rock conventional K-Ar 226-63 "4.72E-04, 0.585E-04, 1.19E-04*" 1.53 0.2351 7 age of volcanism "1.51%, 1.54% K2O" 3908 1 11.47 0.2 sanidine conventional K-Ar 38-3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.93 1.148 78 age of volcanism "6.94%, 6.92% K2O" 3909 1 21.45 0.4 sericite conventional K-Ar 99 "4.72E-04, 0.585E-04, 1.19E-04*" 4.87 1.513 76 K-MICA PLUS QUARTZ CONCENTRATE "4.88%, 4.86%, 4.89%, 4.84% K2O" MAY BE THE AGE OF ALTERATION AND MINERALIZATION 3910 1 21.48 0.4 sericite conventional K-Ar 145 "4.72E-04, 0.585E-04, 1.19E-04*" 3.9 1.213 53 age of volcanism K-MICA PLUS QUARTZ CONCENTRATE "3.90%, 3.91%, 3.89%, 3.89% K2O" 3911 1 20.56 0.4 alunite conventional K-Ar CL-1828 "4.72E-04, 0.585E-04, 1.19E-04*" 6.32 1.881 57 "6.35%, 6.35%, 6.26% K2O" AGE OF MINERALIZATION 3911 2 20.41 0.4 alunite conventional K-Ar CL-1828 "4.72E-04, 0.585E-04, 1.19E-04*" 6.32 1.868 61 "6.35%, 6.35%, 6.26% K2O; ARGON EXTRACTION SYSTEM NOT BAKED-OUT OVERNIGHT" AGE OF MINERALIZATION 3912 1 20.49 0.4 alunite conventional K-Ar 185-79B "4.72E-04, 0.585E-04, 1.19E-04*" 10.04 2.979 33 "9.97%, 10.09%, 10.06% K2O; ARGON EXTRACTION SYSTEM NOT BAKED-OUT OVERNIGHT" TIME OF ALTERATION OR MINERALIZATION 3913 1 10.79 0.8 alunite conventional K-Ar N-46 "4.72E-04, 0.585E-04, 1.19E-04*" 6.73 1.049 17 "6.77%, 6.70%, 6.72% K2O" AGE OF MINERALIZATION 3913 2 10.26 2.1 alunite conventional K-Ar N-46 "4.72E-04, 0.585E-04, 1.19E-04*" 6.73 0.9968 7 "6.77%, 6.70%, 6.72% K2O; ARGON EXTRACTION SYSTEM NOT BAKED-OUT OVERNIGHT" AGE OF MINERALIZATION 3914 1 9.45 1.7 natroalunite conventional K-Ar I3-43 "4.72E-04, 0.585E-04, 1.19E-04*" 2.24 0.3057 8 "2.23%, 2.25%, 2.25% K2O" AGE OF MINERALIZATION 3914 2 6.13 3.9 natroalunite conventional K-Ar I3-43 "4.72E-04, 0.585E-04, 1.19E-04*" 2.24 0.198 23 "2.23%, 2.25%, 2.25% K2O; ARGON EXTRACTION SYSTEM NOT BAKED-OUT OVERNIGHT" SPURIOUS AGE; TOO YOUNG 3915 1 11.92 1.7 alunite conventional K-Ar P3-15 "4.72E-04, 0.585E-04, 1.19E-04*" 4.94 0.8507 9 "4.90%, 4.97% K2O" AGE OF MINERALIZATION 3915 2 2 4 alunite conventional K-Ar P3-15 "4.72E-04, 0.585E-04, 1.19E-04*" 4.94 0.12 1 "4.90%, 4.97% K2O; ARGON EXTRACTION SYSTEM NOT BAKED-OUT OVERNIGHT" SPURIOUS AGE 3916 1 34.4 1.1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3916 2 32.6 1.1 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3917 1 32.7 1.1 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3918 1 23.1 0.9 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3919 1 22.1 0.9 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3920 1 1430 45 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 3921 1 24.7 0.7 K feldspar conventional K-Ar MH-3 "4.962E-04, 0.581E-04, 1.1167E-04" 12.72 4.557 14 age of intrusion "12.72%, 12.72% K2O" 3922 1 24.1 0.7 K feldspar conventional K-Ar MH-4 "4.962E-04, 0.581E-04, 1.1167E-04" 5.625 1.965 32 age of intrusion "5.64%, 5.61% K2O" 3923 1 25.1 0.8 K feldspar conventional K-Ar MH-5 "4.962E-04, 0.581E-04, 1.1167E-04" 13.615 4.948 11 PROBABLY ORTHOCLASE ACCORDING TO X-RAY ANALYSIS "13.67%, 13.56% K2O" AGE OF MINERALIZATION 3924 1 25.7 0.8 K feldspar conventional K-Ar MH-6 "4.962E-04, 0.581E-04, 1.1167E-04" 14.265 5.325 21 minimum age of intrusion "14.29%, 14.24% K2O" 3924 2 25.3 0.8 sericite conventional K-Ar MH-6 "4.962E-04, 0.581E-04, 1.1167E-04" 9 3.309 21 "8.99%, 9.01% K2O" AGE OF ALTERATION 3925 1 8.2 1.2 whole rock conventional K-Ar 583 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3926 1 8.6 1.3 whole rock conventional K-Ar 584 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3927 1 10.6 1 whole rock conventional K-Ar 431 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 3928 1 89.5 2.7 sericite conventional K-Ar M151A "4.962E-04, 0.581E-04, 1.1167E-04" 10.06 13.28 92 minimum age of intrusion MAY ALSO BE THE AGE OF ALTERATION 3929 1 19.5 0.5 plagioclase conventional K-Ar AD-SSAD "4.962E-04, 0.581E-04, 1.1167E-04" 2.353 0.6638 18 K-FELDSPAR AND QUARTZ CONCENTRATE AGE OF MINERALIZATION 3930 1 2.82 0.1 whole rock conventional K-Ar USGS-D2391R "4.72E-04, 0.585E-04, 1.19E-04*" 2.635 0.1072 35 age of volcanism "2.64%, 2.63% K2O" 3931 1 2.93 0.1 whole rock conventional K-Ar USGS-D2392R "4.72E-04, 0.585E-04, 1.19E-04*" 2.54 0.1074 35 age of volcanism "2.56%, 2.52% K2O" 3932 1 5.89 0.2 biotite conventional K-Ar USGS-D2466B "4.72E-04, 0.585E-04, 1.19E-04*" 7.435 0.631 51 maximum age of volcanism "7.42%, 7.45% K2O" CONTAMINATION BY EXTRANEOUS BIOTITE IS A POSSIBILITY 3933 1 7.44 0.2 hornblende conventional K-Ar USGS-D2465H "4.72E-04, 0.585E-04, 1.19E-04*" 1.135 0.1219 44 maximum age of volcanism "1.13%, 1.14% K2O" "(SAMPLE NUMBER IN ERROR, LISTED AS USGS-D2466B -- COMPILER) CONTAMINATION BY EXTRANEOUS FEMICS IS A POSSIBILITY" 3934 1 17.69 1.1 hornblende conventional K-Ar USGS-D2405H "4.72E-04, 0.585E-04, 1.19E-04*" 0.725 0.1856 57 age of volcanism "0.73%, 0.72% K2O" 3934 2 17.82 0.6 plagioclase conventional K-Ar USGS-D2405PL "4.72E-04, 0.585E-04, 1.19E-04*" 2.32 0.598 80 age of volcanism "2.33%, 2.31% K2O" 3935 1 16.07 0.5 whole rock conventional K-Ar USGS-D2390R "4.72E-04, 0.585E-04, 1.19E-04*" 2.47 0.5741 76 age of volcanism "2.44%, 2.46%, 2.45%, 2.52% K2O" 3936 1 22.78 0.8 biotite conventional K-Ar USGS-D2381B "4.72E-04, 0.585E-04, 1.19E-04*" 6.855 2.262 29 age of volcanism "6.85%, 6.86% K2O" 3937 1 23.51 0.5 sanidine conventional K-Ar USGS-D2550S "4.72E-04, 0.585E-04, 1.19E-04*" 9.685 3.299 92 age of volcanism "9.68%, 9.69% K2O" 3938 1 25.25 0.9 biotite conventional K-Ar USGS-D2404B "4.72E-04, 0.585E-04, 1.19E-04*" 7.535 2.758 53 "7.57%, 7.50% K2O" "AGE IS TOO OLD, SAMPLE MAY BE CONTAMINATED, OR CONTAINS EXCESS ARGON, OR THERE WAS AN ANALYTICAL ERROR" 3939 1 21.93 0.9 plagioclase conventional K-Ar USGS-D2436PL "4.72E-04, 0.585E-04, 1.19E-04*" 0.845 0.2684 84 age of volcanism "0.85%, 0.84% K2O" LIES BELOW UNIT 9 (22-23 M.Y. OLD); AGE IS APPARENTLY A BIT TOO YOUNG 3940 1 24.25 1.9 whole rock conventional K-Ar R3476 "4.72E-04, 0.585E-04, 1.19E-04*" 1.385 0.4868 3444 age of volcanism "1.41%, 1.36% K2O; 0.4481 X E-10, 0.5254 X E-10 MOL/GM 40AR-RAD" 3941 1 24.83 0.9 biotite conventional K-Ar USGS-D2380B "4.72E-04, 0.585E-04, 1.19E-04*" 8.08 2.908 62 age of volcanism "8.08%, 8.08% K2O" "GILBERT AND OTHERS (1968) REPORTED AGES OF 22.1+/-0.4 M.Y. (SANIDINE), 22.8+/-0.6 M.Y. (PLAGIOCLASE), AND 24.0+/-1.0 M.Y. (BIOTITE)" 3942 1 25.29 0.8 biotite conventional K-Ar USGS-D2379B "4.72E-04, 0.585E-04, 1.19E-04*" 7.945 2.913 38 age of volcanism "7.93%, 7.96% K2O" 3943 1 26.96 0.4 sanidine conventional K-Ar USGS-D2464S "4.72E-04, 0.585E-04, 1.19E-04*" 10.175 3.979 83 age of volcanism "10.25%, 10.10% K2O" 3943 2 27.39 0.9 biotite conventional K-Ar USGS-D2464B "4.72E-04, 0.585E-04, 1.19E-04*" 8.105 3.22 57 age of volcanism "8.07%, 8.14% K2O" 3944 1 27.22 1.5 biotite conventional K-Ar B-3462 "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 3.0325 2422 age of volcanism "7.733%, 7.627% K2O; 3.095 X E-10, 2.970 X E-10 MOL/GM 40AR-RAD" 3945 1 72.51 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 9.32 66 age of intrusion "8.74%, 8.76% K2O" 3946 1 76.3 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.805 9.88 47 age of intrusion "8.78%, 8.83% K2O" 3947 1 79.54 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.25 10.83 92 age of intrusion 3948 1 150.4 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 18.9 83 age of intrusion "8.37%, 8.37% K2O" 3948 2 153.69 5 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.5715 1.32 57 age of intrusion "0.570%, 0.573% K2O" 3949 1 73.73 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.35 10.13 94 age of intrusion 3950 1 75.61 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 9.75 55 age of intrusion 3951 1 85.36 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.71 12.22 75 age of intrusion "9.68%, 9.74% K2O" 3952 1 87.44 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.52 12.28 88 age of intrusion 3953 1 95.02 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.76 13.71 76 initial age disturbed by later metamorphism "9.75%, 9.77% K2O" EARLY CRETACEOUS PLUTON 3954 1 110.94 4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.33 15.37 96 age of intrusion 3955 1 88.41 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.39 12.25 73 initial age disturbed by later metamorphism JURASSIC PLUTON 3955 2 152.79 5 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.015 2.33 87 age of intrusion 3956 1 92 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.25 12.57 94 initial age disturbed by later metamorphism TRIASSIC PLUTON OR JURASSIC PLUTON 3957 1 105.3 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.32 14.55 89 initial age disturbed by later metamorphism TRIASSIC OR JURASSIC PLUTON 3958 1 130.25 4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.21 17.91 87 initial age disturbed by later metamorphism TRIASSIC OR JURASSIC PLUTON 3959 1 135.53 4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.455 19.16 78 initial age disturbed by later metamorphism "9.44%, 9.47% K2O" TRIASSIC OR JURASSIC PLUTON 3959 2 231.35 9 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.847 3.01 75 age of intrusion CONTAINED SOME CLINOPYROXENE 3960 1 92.03 3 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.177 1.6 68 initial age disturbed by later metamorphism JURASSIC PLUTON 3961 1 100.66 3 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.04 1.55 84 initial age disturbed by later metamorphism JURASSIC PLUTON 3962 1 153.14 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.635 22.17 61 initial age disturbed by later metamorphism "9.63%, 9.64% K2O" JURASSIC PLUTON 3963 1 174.06 6 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.9465 2.49 73 age of intrusion "0.945%, 0.948% K2O" 3964 1 165.15 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.205 22.92 85 initial age disturbed by later metamorphism "9.18%, 9.23% K2O" 3964 2 179.79 6 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.9075 2.47 56 age of intrusion "0.905%, 0.910% K2O" 3965 1 210.27 7 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.087 3.49 85 age of intrusion 3970 1 17.2 0.7 biotite conventional K-Ar 209/63 "4.72E-04, 0.585E-04, 1.19E-04" "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" NO ANALYTICAL DATA GIVEN 3971 1 16 0.6 muscovite conventional K-Ar 106/63 "4.72E-04, 0.585E-04, 1.19E-04" "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" NO ANALYTICAL DATA GIVEN 3972 1 143.4 4.3 biotite conventional K-Ar 193/63 "4.72E-04, 0.585E-04, 1.19E-04" "age of metamorphic crystallization, initial age disturbed by later metamorphism" NO ANALYTICAL DATA GIVEN 3979 1 16.8 0.6 biotite conventional K-Ar 149/63 "4.72E-04, 0.585E-04, 1.19E-04" "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" NO ANALYTICAL DATA GIVEN 3985 1 7.46 0.5 glass conventional K-Ar D1884GL "4.72E-04, 0.584E-04, 1.19E-04*" 4.52 0.4864 38 age of volcanism HYDRATED GLASS 3986 1 11.59 3.3 glass conventional K-Ar D1880GL "4.72E-04, 0.584E-04, 1.19E-04*" 4.9 0.8201 7 age of volcanism HYDRATED GLASS 3987 1 9.87 5 glass conventional K-Ar D1881GL "4.72E-04, 0.584E-04, 1.19E-04*" 5.21 0.7423 3 HYDRATED GLASS GLASS GAVE AN AGE THAT IS LESS THAN THE AGE OF THE FORMATION--11.3 M.Y. SOME RADIOGENIC ARGON HAS LEAKED OUT. 3988 1 9.84 0.4 glass conventional K-Ar D1879GL "4.72E-04, 0.584E-04, 1.19E-04*" 5.35 0.7602 71 HYDRATED GLASS GLASS GAVE AN AGE LESS THAN THE AGE OF THE FORMATION--13.3 M.Y. GLASS LEAKED SOME RADIOGENIC ARGON. 3989 1 15.95 1.7 glass conventional K-Ar D1921GL "4.72E-04, 0.584E-04, 1.19E-04*" 4.6 1.061 16 age of volcanism NONHYDRATED GLASS 3990 1 6.28 0.3 glass conventional K-Ar 1(D1889GL) "4.72E-04, 0.584E-04, 1.19E-04*" 5.18 0.4694 82 age of volcanism NONHYDRATED GLASS REPLICATE K2O ANALYSES 3991 1 7.82 0.6 glass conventional K-Ar 4(D1883GL) "4.72E-04, 0.584E-04, 1.19E-04*" 5.56 0.6273 23 HYDRATED GLASS REPLICATE K2O ANALYSES AGE APPEARS TOO YOUNG BASED ON MINERAL AGE OF 9.0 M.Y. 3992 1 51 2 muscovite conventional K-Ar SP-1 "4.72E-04, 0.585E-04, 1.19E-04" 9.87 73 age of intrusion AR-40/K-40 = 0.00299 3993 1 42 2 biotite conventional K-Ar SP-2 "4.72E-04, 0.585E-04, 1.19E-04" 4.67 27 age of intrusion AR-40/K-40 = 0.00249 3994 1 129 6 hornblende conventional K-Ar 1014 "4.72E-04, 0.585E-04, 1.19E-04" 0.625 76 age not evaluated AR-40/K-40 = 0.00780 3995 1 188 7 biotite conventional K-Ar 1015 "4.72E-04, 0.585E-04, 1.19E-04" 7.89 89 maximum age of intrusion AR-40/K-40 = 0.01155 3996 1 367 18 hornblende conventional K-Ar 1016 "4.72E-04, 0.585E-04, 1.19E-04" 0.862 95 age meaning uncertain (geologic factors) AR-40/K-40 = 0.02365 3997 1 67.2 3 biotite conventional K-Ar 1017 "4.72E-04, 0.585E-04, 1.19E-04" 7.39 83 age meaning uncertain (geologic factors) AR-40/K-40 = 0.00400 3998 1 19.5 1 biotite conventional K-Ar SP-3 "4.72E-04, 0.585E-04, 1.19E-04" 7.69 35 age meaning uncertain (geologic factors) AR-40/K-40 = 0.001145 3999 1 149 6 biotite conventional K-Ar 1018 "4.72E-04, 0.585E-04, 1.19E-04" 8.62 96 age of intrusion AR-40/K-40 = 0.00903 4000 1 155 6 biotite conventional K-Ar KA840 "4.72E-04, 0.585E-04, 1.19E-04" 8.43 76 age of intrusion AR-40/K-40 = 0.00945 4001 1 21.1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 7.21 70 age of volcanism 4002 1 4.39 0.4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.3 0.462 28 age of volcanism 4003 1 15.62 0.7 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.47 1.913 74 age of volcanism "8.34%, 8.59% K2O" 4004 1 15.38 0.5 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 8.79 1.955 66 age of volcanism 4005 1 15.41 0.5 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.8 1.961 70 age of volcanism 4006 1 13.73 0.7 biotite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 7.56 1.5 54 age of volcanism "7.44%, 7.68% K2O" 4006 2 11.93 2 hornblende conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 0.925 0.1594 38 age of volcanism "0.92%, 0.93% K2O" 4007 1 17.72 3 whole rock conventional K-Ar 12(1-14-21) "4.72E-04, 0.584E-04, 1.19E-04*" 3.08 0.7898 6 age of volcanism 4007 2 16.03 3 whole rock conventional K-Ar 13(1-14-21) "4.72E-04, 0.584E-04, 1.19E-04*" 3.08 0.7139 5 age of volcanism 4008 1 9.81 3.2 hornblende conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.61 0.0864 32 age of volcanism "0.61%, 0.61% K2O" 4009 1 11.37 0.5 whole rock conventional K-Ar 24(2-93-3) "4.72E-04, 0.584E-04, 1.19E-04*" 2.4 0.394 21 age of volcanism "2.36%, 2.46%, 2.39% K2O" 4010 1 12.09 0.5 whole rock conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 4.03 0.7038 81 age of volcanism "4.07%, 3.99% K2O" 4011 1 12.96 0.8 whole rock conventional K-Ar 27(1-71-2) "4.72E-04, 0.584E-04, 1.19E-04*" 2.62 0.4908 17 age of volcanism "2.63%, 2.61% K2O" 4012 1 14.16 0.2 whole rock conventional K-Ar 28(BC411) "4.72E-04, 0.584E-04, 1.19E-04*" 2.135 0.4369 5155 age of volcanism "2.13%, 2.14% K2O AND 4.385 X E-11, 4.353 X E-11 MOL/GM AR-40" 4013 1 13.57 0.4 biotite conventional K-Ar 29(12-L-59) "4.72E-04, 0.584E-04, 1.19E-04*" 8.19 1.606 36 age of volcanism "8.22%, 8.16% K2O" 4014 1 13.6 0.3 biotite conventional K-Ar 30(53-L-59) "4.72E-04, 0.584E-04, 1.19E-04*" 8.22 1.615 42 age of volcanism "8.24%, 8.20%, 8.23% K2O" 4015 1 14.89 0.6 biotite conventional K-Ar 34(BC301) "4.72E-04, 0.584E-04, 1.19E-04*" 8.21 1.767 85 age of volcanism 4015 2 14.75 0.5 sanidine conventional K-Ar 35(BC301) "4.72E-04, 0.584E-04, 1.19E-04*" 8.87 1.891 96 age of volcanism 4016 1 15.69 0.6 biotite conventional K-Ar 36(BC304) "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 1.946 73 age of volcanism 4017 1 16.49 0.6 sanidine conventional K-Ar 37(TP23) "4.72E-04, 0.584E-04, 1.19E-04*" 7.64 1.822 85 age of volcanism "7.69%, 7.59% K2O" 4017 2 16.17 0.6 biotite conventional K-Ar 38(TP23) "4.72E-04, 0.584E-04, 1.19E-04*" 8.27 1.934 89 age of volcanism "8.26%, 8.28% K2O" 4018 1 14.87 0.6 sanidine conventional K-Ar 39(BC308) "4.72E-04, 0.584E-04, 1.19E-04*" 9.17 1.971 92 age of volcanism 4018 2 16.02 0.7 biotite conventional K-Ar 40(BC308) "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 2.016 72 age of volcanism 4019 1 16.17 0.2 biotite conventional K-Ar 41(BC483D) "4.72E-04, 0.584E-04, 1.19E-04*" 8.13 1.901 7985 age of volcanism "8.07%, 8.19% K2O; 1.906 E-10, 1.896 E-10 MOL/GM AR-40" 4019 2 18.93 0.3 hornblende conventional K-Ar 42(BC483D) "4.72E-04, 0.584E-04, 1.19E-04*" 1.28 0.3507 5438 age of volcanism "1.28%, 1.28% K2O; 0.3453 E-10, 0.3560 E-10 MOL/GM AR-40" 4020 1 5.04 0.4 whole rock conventional K-Ar 15(BC405) "4.72E-04, 0.584E-04, 1.19E-04*" 1.395 0.1014 77 age of volcanism "1.40%, 1.39% K2O; 0.1056 E-10, 0.09723 E-10 MOL/GM AR-40" 4021 1 12.29 0.2 whole rock conventional K-Ar 26(BC412) "4.72E-04, 0.584E-04, 1.19E-04*" 2.335 0.4147 6673 age of volcanism "2.36%, 2.31% K2O; 0.4198 E-10, 0.4096 E-10 MOL/GM AR-40" 4022 1 13.33 0.2 whole rock conventional K-Ar 31(BC424) "4.72E-04, 0.584E-04, 1.19E-04*" 1.14 0.2196 4242 age of volcanism "1.11%, 1.17% K2O; 0.2152 E-10, 0.2240 E-10 MOL/GM AR-40" 4023 1 14.91 0.3 whole rock conventional K-Ar 33(BC409B) "4.72E-04, 0.584E-04, 1.19E-04*" 1.465 0.3158 2820 age of volcanism "1.47%, 1.46% K2O; 0.3227 E-10, 0.3088 E-10 MOL/GM AR-40" 4024 1 19.01 0.7 whole rock conventional K-Ar 43(BC309) "4.72E-04, 0.584E-04, 1.19E-04*" 5.725 1.575 82 age of volcanism "5.72%, 5.73% K2O" 4024 2 23.35 0.9 sanidine conventional K-Ar 44(BC309) "4.72E-04, 0.584E-04, 1.19E-04*" 8.93 3.022 94 maximum age of volcanism "8.88%, 8.98% K2O" AGE MAY BE TOO OLD 4024 3 28.54 1.1 biotite conventional K-Ar 45(BC309) "4.72E-04, 0.584E-04, 1.19E-04*" 8.505 3.522 85 "8.47%, 8.54% K2O" AGE APPEARS TOO OLD 4024 4 41.76 1.6 biotite conventional K-Ar 46(BC309) "4.72E-04, 0.584E-04, 1.19E-04*" 8.955 5.447 87 "8.98%, 8.93% K2O" AGE APPEARS TOO OLD FOR UNKNOWN REASONS 4025 1 15.57 0.6 biotite conventional K-Ar 58(BC303) "4.72E-04, 0.584E-04, 1.19E-04*" 8.974 2.02 5026 age of intrusion "8.978%, 8.970% K2O; 1.99 E-10, 2.05 E-10 MOL/GM AR-40" 4026 1 13.97 0.6 biotite conventional K-Ar 59(BC305) "4.72E-04, 0.584E-04, 1.19E-04*" 8.3215 1.68 5249 age of intrusion "8.421%, 8.222% K2O; 1.72 E-10, 1.64 E-10 MOL/GM AR-40" 4027 1 20 0.8 biotite conventional K-Ar PED-21-64 "4.76E-04, 0.585E-04, 1.21E-04*" 8.55 2.48 63 age of volcanism AGE ALSO PUBLISHED BY ANDERSON AND OTHERS (1970) 4028 1 11.9 0.7 whole rock conventional K-Ar PED-1-65 "4.76E-04, 0.585E-04, 1.21E-04*" 6.81 1.17 30 age of volcanism AGE ALSO PUBLISHED BY ANDERSON AND OTHERS (1970) 4029 1 88.12 3 biotite conventional K-Ar 66NC100 "4.72E-04, 0.585E-04, 1.19E-04*" 9.445 12.28 82 age of intrusion "9.43%, 9.46% K2O" 4029 2 91.26 3 biotite conventional K-Ar 66NC100 "4.72E-04, 0.585E-04, 1.19E-04*" 8.385 11.3 74 age of intrusion "8.37%, 8.38% K2O" 4030 1 155.63 5 biotite conventional K-Ar 66NC24 "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 19.47 83 age of intrusion "8.32%, 8.32% K2O" 4031 1 153.11 5 biotite conventional K-Ar 66NC35 "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 19.67 88 age of intrusion "8.58%, 8.52% K2O" 4032 1 39.34 1.5 biotite conventional K-Ar 68NC126 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 4.81 60 age of intrusion 4033 1 9.2 0.3 whole rock conventional K-Ar 1(MA-11) "4.962E-04, 0.581E-04, 1.1167E-04" 2.411 0.3199 62 age of volcanism 4034 1 9.1 0.3 whole rock conventional K-Ar 2(MA-4B) "4.962E-04, 0.581E-04, 1.1167E-04" 2.307 0.3042 76 age of volcanism 4035 1 8.7 0.3 biotite conventional K-Ar 11(GLENDALE) "4.962E-04, 0.581E-04, 1.1167E-04" 7.435 0.9314 57 age of volcanism 4036 1 14.8 0.4 hornblende conventional K-Ar 12(SW-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.643 0.1375 44 age of volcanism 4037 1 11 0.3 hornblende conventional K-Ar 14(OP-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.158 0.1836 41 age of volcanism 4038 1 23.1 0.7 hornblende conventional K-Ar 19(2384-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.581 0.1945 60 age of volcanism 4038 2 22 0.7 plagioclase conventional K-Ar 19(2384-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.767 0.2441 77 age of volcanism 4039 1 24.7 0.7 hornblende conventional K-Ar 20(16149-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.732 0.2617 55 age of intrusion 4040 1 15.4 0.5 plagioclase conventional K-Ar 21(2605-5) "4.962E-04, 0.581E-04, 1.1167E-04" 0.224 0.4999 40 age of volcanism 4041 1 15.4 0.5 hornblende conventional K-Ar 22(11920-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.676 0.1503 55 age of volcanism 4041 2 15.1 0.5 plagioclase conventional K-Ar 22(11920-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.336 0.7341 48 age of volcanism 4042 1 22.1 0.7 plagioclase conventional K-Ar 23(2306-7) "4.962E-04, 0.581E-04, 1.1167E-04" 0.824 0.2635 72 age of volcanism 4042 2 23.1 0.7 biotite conventional K-Ar 23(2306-7) "4.962E-04, 0.581E-04, 1.1167E-04" 8.39 0.2811 64 age of volcanism 4043 1 25.6 0.8 sanidine conventional K-Ar 24(MLS-73-9) "4.962E-04, 0.581E-04, 1.1167E-04" 7.915 0.2941 61 age of volcanism 4044 1 26.7 0.8 sanidine conventional K-Ar 25(MLS-73-10) "4.962E-04, 0.581E-04, 1.1167E-04" 10.265 0.3981 82 age of volcanism 4045 1 28.3 0.9 sanidine conventional K-Ar 26(3289-10) "4.962E-04, 0.581E-04, 1.1167E-04" 10.63 0.4363 87 age of volcanism 4045 2 25 0.8 plagioclase conventional K-Ar 26(3289-10) "4.962E-04, 0.581E-04, 1.1167E-04" 1.068 0.3878 82 AGE APPEARS TOO YOUNG 4046 1 108 3 biotite conventional K-Ar 27(L-317) "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 13.36 85 age of intrusion 4047 1 38.5 1.2 biotite conventional K-Ar 28(L-340) "4.962E-04, 0.581E-04, 1.1167E-04" 8.505 4.762 89 age of intrusion 4048 1 78.4 3.9 biotite conventional K-Ar 29(GS-B10) "4.962E-04, 0.581E-04, 1.1167E-04" 3.55 4.093 55 minimum age of intrusion 4049 1 159 5 biotite conventional K-Ar 30(MB43) "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 21.72 94 minimum age of intrusion LOWER AGE MAY BE DUE TO LOSS OF ARGON 4049 2 172 5 hornblende conventional K-Ar 30(MB43) "4.962E-04, 0.581E-04, 1.1167E-04" 0.701 1.821 87 age of intrusion 4050 1 91.9 2.8 biotite conventional K-Ar 31(RILEY) "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 11.93 95 age of intrusion 4050 2 92.1 2.8 hornblende conventional K-Ar 31(RILEY) "4.962E-04, 0.581E-04, 1.1167E-04" 1.31 1.786 85 age of intrusion 4051 1 124 6 hornblende conventional K-Ar 32(6300B) "4.962E-04, 0.581E-04, 1.1167E-04" 0.233 0.4292 60 age of intrusion 4052 1 9.5 0.6 plagioclase conventional K-Ar 33(DP2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.431 0.1962 21 UNUSUALLY LOW RADIOGENIC ARGON SUGGESTS HYDROTHERMAL ALTERATION; AGE IS APPARENTLY TOO YOUNG 4052 2 26.2 1.2 hornblende conventional K-Ar 33(DP2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.434 0.1646 25 minimum age of intrusion UNUSUALLY LOW RADIOGENIC ARGON SUGGESTS HYDROTHERMAL ALTERATION 4053 1 11.2 0.3 whole rock conventional K-Ar 36(6-12-75) "4.962E-04, 0.581E-04, 1.1167E-04" 1.161 0.1874 30 age of volcanism NOT TREATED WITH ACID 4053 2 11.1 0.3 whole rock conventional K-Ar 35(6-12-75A) "4.962E-04, 0.581E-04, 1.1167E-04" 1.213 0.1944 31 age of volcanism HF AND HNO3 ACID TREATMENT TO REDUCE ATMOSPHERIC ARGON CONTENT 4054 1 13.2 0.4 whole rock conventional K-Ar 36(L. MCKINNEY) "4.962E-04, 0.581E-04, 1.1167E-04" 1.926 0.3686 22 age of volcanism 4055 1 11.8 0.4 whole rock conventional K-Ar 37(L. MCKINNEY) "4.962E-04, 0.581E-04, 1.1167E-04" 1.894 0.3231 25 age of volcanism 4056 1 10.6 0.4 whole rock conventional K-Ar 38(COAL CAN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.444 0.2216 26 age of volcanism 4057 1 1.24 0.21 whole rock conventional K-Ar 39(BS-1) "4.962E-04, 0.581E-04, 1.1167E-04" 2.455 0.0438 6 age of volcanism "NOT TREATED WITH ACID, -60 +100 MESH" 4057 2 1.29 0.03 whole rock conventional K-Ar 40(BS-1A) "4.962E-04, 0.581E-04, 1.1167E-04" 2.453 0.0457 1628 age of volcanism TREATED WITH HF AND HNO3 ACID BEFORE FUSION 4.648 E-10 AND 4.483 E-10 MOL/GRAM AR-40 4057 3 1.4 0.14 whole rock conventional K-Ar 41(BS-1B) "4.962E-04, 0.581E-04, 1.1167E-04" 2.463 0.0496 12 age of volcanism TREATED WITH BROMOFORM AND PHOSPHORIC ACID BEFORE FUSION 4058 1 19.5 0.6 alunite conventional K-Ar 42(SA-1) "4.962E-04, 0.581E-04, 1.1167E-04" 7.79 2.2 47 AGE OF ALTERATION 4059 1 10.3 0.3 adularia conventional K-Ar 48(GB1) "4.962E-04, 0.581E-04, 1.1167E-04" 6.945 1.031 33 MINERALIZATION-ALTERATION AGE 4060 1 84.2 2.5 muscovite conventional K-Ar 46(KF-1-6) "4.962E-04, 0.581E-04, 1.1167E-04" 5.76 7.146 68 VERY FINE-GRAINED AGE OF MINERALIZATION-ALTERATION 4061 1 87.3 2.6 Unk conventional K-Ar 47(KF-1-6) "4.962E-04, 0.581E-04, 1.1167E-04" 3.435 4.424 80 THE SILICATE GANGUE WITH SULFIDES REMOVED AGE OF MINERALIZATION-ALTERATION 4062 1 5.2 0.5 adularia conventional K-Ar 48(IVO-1) "4.962E-04, 0.581E-04, 1.1167E-04" 4.745 0.3529 14 AGE OF MINERALIZATION 4063 1 9.5 0.2 adularia conventional K-Ar 50(MLS-73-2) "4.962E-04, 0.581E-04, 1.1167E-04" 3.17 0.4327 3854 "4.343 E-11, 4.311 E-11 MOL/GM AR-40" AGE OF MINERALIZATION-ALTERATION 4064 1 10.7 0.3 biotite conventional K-Ar 51(MLS-73-1) "4.962E-04, 0.581E-04, 1.1167E-04" 7.22 1.119 34 age of volcanism 4065 1 10.9 0.3 whole rock conventional K-Ar 52(CH821) "4.962E-04, 0.581E-04, 1.1167E-04" 8.04 1.261 2929 QUARTZ-K-FELDSPAR-MUSCOVITE-PYRITE-CHLORITE ASSEMBLAGE "1.252 E-10, 1.270 E-10 MOL/GM AR-40" MINERALIZATION AGE 4066 1 17.3 0.2 K feldspar conventional K-Ar 53(CD138) "4.962E-04, 0.581E-04, 1.1167E-04" 3.18 0.7949 4551 "8.059 E-11, 7.838 E-11 MOL/GM AR-40" AGE OF MINERALIZATION-ALTERATION 4067 1 75.9 2.3 K feldspar conventional K-Ar 54(CD142) "4.962E-04, 0.581E-04, 1.1167E-04" 11.33 12.64 92 AGE OF MINERALIZATION-ALTERATION 4068 1 35 1.1 biotite conventional K-Ar 55(AR-298) "4.962E-04, 0.581E-04, 1.1167E-04" 8.2 4.169 85 age of intrusion 4069 1 131 4 biotite conventional K-Ar 56(6460-1) "4.962E-04, 0.581E-04, 1.1167E-04" 5.66 11.07 83 minimum age of intrusion POSSIBLE AGE OF ALTERATION-MINERALIZATION 4070 1 13.4 1.5 plagioclase conventional K-Ar 3(CP-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.395 0.0762 109 age of volcanism "8.450 E-12, 6.790 E-12 MOL/GM AR-40" 4071 1 11.2 0.3 plagioclase conventional K-Ar 4(LS-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.701 0.1136 45 age of volcanism 4072 1 15 0.5 hornblende conventional K-Ar 5(LS-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.48 0.1038 30 maximum age of volcanism POSSIBLE INCLUSION OF XENOCRYSTIC MATERIAL 4073 1 7.3 0.3 hornblende conventional K-Ar 6(MR-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.6045 0.0639 21 age of volcanism 4074 1 12.1 0.5 hornblende conventional K-Ar 7(MR-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.862 0.1502 25 age of volcanism 4075 1 26.4 0.8 plagioclase conventional K-Ar 8(BH-T) "4.962E-04, 0.581E-04, 1.1167E-04" 0.367 0.1406 62 age of volcanism THIS IS THE OLDEST KNOWN AGE OF AN ANDESITE FLOW UNIT FROM THIS PART OF THE SIERRA NEVADA 4076 1 13.5 0.4 plagioclase conventional K-Ar 9(CP-4) "4.962E-04, 0.581E-04, 1.1167E-04" 0.329 0.0641 46 age of volcanism 4076 2 12.9 0.4 hornblende conventional K-Ar 9(CP-4) "4.962E-04, 0.581E-04, 1.1167E-04" 0.581 0.1085 43 age of volcanism 4077 1 11 0.9 plagioclase conventional K-Ar 10(BONTA) "4.962E-04, 0.581E-04, 1.1167E-04" 0.252 0.04 15 maximum age of volcanism POSSIBLY THIS IS XENOCRYSTIC MATERIAL 4077 2 10.9 0.4 hornblende conventional K-Ar 10(BONTA) "4.962E-04, 0.581E-04, 1.1167E-04" 0.473 0.0744 29 maximum age of volcanism POSSIBLY THIS IS XENOCRYSTIC MATERIAL 4078 1 10.5 0.3 hornblende conventional K-Ar 13(MN-4) "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.0973 32 age of volcanism 4079 1 8.9 0.3 biotite conventional K-Ar 15(ME-3) "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 1.032 65 age of volcanism 4080 1 9.1 0.3 biotite conventional K-Ar 16(ME-4) "4.962E-04, 0.581E-04, 1.1167E-04" 8.1 1.066 51 age of volcanism 4081 1 9.5 0.3 biotite conventional K-Ar 17(M-3) "4.962E-04, 0.581E-04, 1.1167E-04" 8.735 1.195 59 age of volcanism 4081 2 9.7 0.4 plagioclase conventional K-Ar 17(M-3) "4.962E-04, 0.581E-04, 1.1167E-04" 0.591 0.0832 24 age of volcanism 4082 1 20 0.8 whole rock conventional K-Ar 18(N621) "4.962E-04, 0.581E-04, 1.1167E-04" 1.73 0.5019 40 age of volcanism LOWER AGE LIMIT FOR MAJOR CALC-ALKALINE ANDESITE ERUPTIONS IN THIS PART OF THE SIERRA NEVADA 4083 1 19.2 0.8 whole rock conventional K-Ar 18(N621) "4.962E-04, 0.581E-04, 1.1167E-04" 1.75 0.4866 32 age of volcanism LOWER AGE LIMIT FOR MAJOR CALC-ALKALINE ANDESITE ERUPTIONS IN THIS PART OF THE SIERRA NEVADA 4084 1 4.95 0.24 sericite conventional K-Ar 44(ZACA) "4.962E-04, 0.581E-04, 1.1167E-04" 9.7 0.6926 5781 "6.688 E-11, 7.165 E-11 MOL/GM AR-40" AGE INDICATES TIME OF ALTERATION (MINERALIZATION) 4085 1 4.76 0.19 whole rock conventional K-Ar 45(Z-4/69) "4.962E-04, 0.581E-04, 1.1167E-04" 7.667 0.5266 48 AGE INDICATES TIME OF ALTERATION (MINERALIZATION) 4092 1 94.65 1.3 whole rock conventional K-Ar YU-P-2 "4.72E-04, 0.584E-04, 1.19E-04*" 3.95 5.526 7033 age of intrusion REPLICATE ANALYSES 4093 1 99.65 1.5 biotite conventional K-Ar YU-PF-1 "4.72E-04, 0.584E-04, 1.19E-04*" 9.83 14.5 8585 age of intrusion REPLICATE AR AND K ANALYSES 4094 1 103.07 2 biotite conventional K-Ar YU-PF-2 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 13.82 85 age of intrusion 4095 1 110.05 2.1 biotite conventional K-Ar YU-PF-3 "4.72E-04, 0.584E-04, 1.19E-04*" 9.09 14.85 88 age of intrusion REPLICATE K ANALYSES 4096 1 110.32 1.5 plagioclase conventional K-Ar YU-P-1 "4.72E-04, 0.584E-04, 1.19E-04*" 4.36 7.141 9282 minimum age of metamorphic crystallization REPLICATE K AND AR ANALYSES 4097 1 93.62 1.3 biotite conventional K-Ar YU-P-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.64 10.57 8988 REPLICATE K AND AR ANALYSES PROBABLE TIME OF HYDROTHERMAL ALTERATION 4098 1 61 1.2 microcline conventional K-Ar YU-P-156 "4.72E-04, 0.584E-04, 1.19E-04*" 10.46 9.343 84 MICROPERTHITIC MICROCLINE "SPURIOUS AGE, PROBABLY DUE TO POST-EMPLACEMENT LOSS OF AR FROM MICROCLINE" 4099 1 102.16 2 whole rock conventional K-Ar YU-P-156-1 "4.72E-04, 0.584E-04, 1.19E-04*" 4.37 6.613 80 minimum age of metamorphic crystallization 4100 1 26.19 0.9 sanidine conventional K-Ar N70-21-S "4.72E-04, 0.585E-04, 1.19E-04*" 6.53 2.48 53 age of volcanism 4101 1 27 0.9 glass conventional K-Ar N70-28-NG "4.72E-04, 0.585E-04, 1.19E-04*" 3.37 1.32 94 age of volcanism NONHYDRATED GLASS 4119 1 25.17 0.9 whole rock conventional K-Ar N70-22-WR "4.72E-04, 0.585E-04, 1.19E-04*" 0.825 0.301 11 age of volcanism 4128 1 103.53 4 biotite conventional K-Ar NM-5 DIKE "4.72E-04, 0.585E-04, 1.19E-04*" 2.973 4.561 minimum age of intrusion 4129 1 91.36 3.2 muscovite conventional K-Ar NORTHWEST DIKE "4.72E-04, 0.585E-04, 1.19E-04*" 10.05 13.56 minimum age of intrusion 4130 1 89.28 3.2 biotite conventional K-Ar OLSEN STOCK "4.72E-04, 0.585E-04, 1.19E-04*" 8.492 11.19 minimum age of intrusion MAY BE THE AGE OF TUNGSTEN MINERALIZATION 4131 1 81.1 2.9 biotite conventional K-Ar FORGE STOCK "4.72E-04, 0.585E-04, 1.19E-04*" 8.336 9.955 minimum age of intrusion MAY BE THE AGE OF TUNGSTEN MINERALIZATION 4132 1 80.65 2.9 biotite conventional K-Ar SPRINGER STOCK "4.72E-04, 0.585E-04, 1.19E-04*" 7.381 8.765 minimum age of intrusion MAY BE THE AGE OF MINERALIZATION 4133 1 78.16 2.7 adularia conventional K-Ar SPRINGER QUARTZ VEINS "4.72E-04, 0.585E-04, 1.19E-04*" 15.26 17.55 AGE OF VEIN; AGE OF TUNGSTEN MINERALIZATION 4134 1 76.08 2.8 biotite conventional K-Ar UNCLE SAM STOCK "4.72E-04, 0.585E-04, 1.19E-04*" 8.004 8.955 minimum age of intrusion MAY BE THE AGE OF TUNGSTEN MINERALIZATION 4135 1 74.1 2.6 adularia conventional K-Ar SUTTON QUARTZ VEINS "4.72E-04, 0.585E-04, 1.19E-04*" 13.242 14.42 AGE OF VEIN; AGE OF TUNGSTEN MINERALIZATION 4136 1 68.43 2.5 biotite conventional K-Ar SOUTHWEST STOCK "4.72E-04, 0.585E-04, 1.19E-04*" 7.211 7.241 minimum age of intrusion 4137 1 1.16 0.04 whole rock conventional K-Ar S18 "4.72E-04, 0.585E-04, 1.19E-04*" 1.765 0.0296 38 age of volcanism REPLICATE K ANALYSES 4138 1 110.6 6 biotite conventional K-Ar 4(S-EPR4079B/D3R) "4.72E-04, 0.584E-04, 1.19E-04*" 2.99 4.91 30 age of intrusion SEVERELY CHLORITIZED 4139 1 93.37 7 whole rock conventional K-Ar 5(S-EPR4079C/D4R) "4.72E-04, 0.584E-04, 1.19E-04*" 3.82 5.27 24 minimum age of intrusion "THIS STOCK PREVIOUSLY DATED AS 121 M.Y. OLD (HAUSEN AND KERR, 1968)" 4140 1 14.82 1.8 whole rock conventional K-Ar 6(S-EPR4064E/N-KR-44B) "4.72E-04, 0.584E-04, 1.19E-04*" 1.96 0.42 10 age of intrusion 4141 1 50.48 2 biotite conventional K-Ar 7(S-EPR4094D) "4.72E-04, 0.584E-04, 1.19E-04*" 7.87 5.8 34 maximum age of intrusion OTHER SAMPLES GIVE AGES OF 30-40 M.Y. 4142 1 33.45 1.5 biotite conventional K-Ar 8(S-ERP4063A/N-KR-1) "4.72E-04, 0.584E-04, 1.19E-04*" 8.64 4.2 49 minimum age of intrusion OTHER SAMPLES GIVE AGES OF 40 AND 49 M.Y. 4143 1 40.93 1 whole rock conventional K-Ar 9(S-ERP4063D/N-KR-41) "4.72E-04, 0.584E-04, 1.19E-04*" 7.87 4.69 78 age of intrusion "THIS PLUTON DATED AS 36 M.Y. BY SILBERMAN AND MCKEE (1971); OTHER SAMPLES GAVE AGES OF 49, 32.6, AND 29.9 M.Y." 4144 1 86.53 2.5 whole rock conventional K-Ar 10(S-EPR4064B) "4.72E-04, 0.584E-04, 1.19E-04*" 4.43 5.653 76 PROBABLY A SPURIOUS AGE 4145 1 95.49 9 orthoclase conventional K-Ar 11(S-EPR4064C) "4.72E-04, 0.584E-04, 1.19E-04*" 3.66 5.167 53 ALTERED ORTHOCLASE SPURIOUS AGE; AGE OF PLUTON IS JURASSIC 4145 2 182.94 4 muscovite conventional K-Ar 11(S-EPR4064C) "4.72E-04, 0.584E-04, 1.19E-04*" 9.34 25.89 80 maximum age of intrusion FRESH MUSCOVITE ARMSTRONG (1970) OBTAINED AN AGE OF 152 M.Y. FOR THIS PLUTON 4146 1 152.07 3 muscovite conventional K-Ar 12(S-EPR4064D) "4.72E-04, 0.584E-04, 1.19E-04*" 10.34 23.62 69 age of intrusion ARMSTRONG (1970) OBTAINED AN AGE OF 152 M.Y. FOR THIS PLUTON 4147 1 126.53 12 biotite conventional K-Ar 13(S-EPR4064A) "4.72E-04, 0.584E-04, 1.19E-04*" 2.39 4.51 39 age of intrusion 4147 2 73.25 3 orthoclase conventional K-Ar S-EPR4064A "4.72E-04, 0.584E-04, 1.19E-04*" 11.94 12.85 89 ALTERED ORTHOCLASE "MINIMUM AGE OF 100 M.Y. REPORTED FOR THIS STOCK (SILBERMAN AND MCKEE, 1971); THIS ORTHOCLASE AGE IS SPURIOUS" 4148 1 86.3 3 whole rock conventional K-Ar 14(S-EPR4078D/G7G117R) "4.72E-04, 0.584E-04, 1.19E-04*" 11.11 14.14 75 minimum age of intrusion "SIMILAR SILL GAVE AGE OF 94 M.Y. (SILBERMAN AND MCKEE, 1970)" 4149 1 90.67 3 whole rock conventional K-Ar 15(S-EPR4078C/67G115R) "4.72E-04, 0.584E-04, 1.19E-04*" 11.13 14.9 75 minimum age of intrusion SILBERMAN AND MCKEE (1970) OBTAINED AN AGE OF 94 M.Y. FOR A SIMILAR RHYOLITE 4150 1 132.99 3 biotite conventional K-Ar 16(S-EPR4083A/SCE636) "4.72E-04, 0.584E-04, 1.19E-04*" 7.7 15.3 72 minimum age of intrusion QUESTIONABLE AGE AS KRUEGER AND SCHILLING (1971) OBTAINED AN AGE OF 157 M.Y. FOR THIS PLUTON 4150 2 106.04 2 orthoclase conventional K-Ar 16(S-EPR4083A/SCE636) "4.72E-04, 0.584E-04, 1.19E-04*" 12.23 19.23 82 ALTERED ORTHOCLASE SPURIOUS AGE 4151 1 79.18 1.5 biotite conventional K-Ar 17(S-EPR4094E/SCE1021) "4.72E-04, 0.584E-04, 1.19E-04*" 8.77 10.22 65 age of intrusion "SIMILAR AGES WERE OBTAINED BY SILBERMAN AND MCKEE (1971, P. 30) AND KRUEGER AND SCHILLING (1971, P. 10 AND 11)" 4152 1 140 8 biotite conventional K-Ar 18(S-EPR4120A) "4.72E-04, 0.584E-04, 1.19E-04" 4.46 8.21 64 age of intrusion (*) 4153 1 96.13 5.4 biotite conventional K-Ar 19(S-EPR4120B) "4.72E-04, 0.584E-04, 1.19E-04*" 6.31 8.97 38 ALTERED BIOTITE PROBABLY A HYBRID AGE 4153 2 115.13 4.8 muscovite conventional K-Ar 19(S-EPR4120B) "4.72E-04, 0.584E-04, 1.19E-04*" 8.84 15.13 54 PROBABLY A HYBRID AGE 4154 1 306.24 13 whole rock conventional K-Ar 21(S-EPR4063B/N-KR-3) "4.72E-04, 0.584E-04, 1.19E-04*" 0.77 3.7 60 AGE SUGGESTS A METAMORPHIC EVENT DURING THE PENNSYLVANIA-PERMIAN TIMES 4155 1 104.32 7 whole rock conventional K-Ar 22(S-EPR4120C) "4.72E-04, 0.584E-04, 1.19E-04*" 2.6 4.02 37 "minimum age of volcanism, minimum age of metamorphic crystallization" HYBRID AGE DUE TO INTRUSION OF MONTE CRISTO STOCK 4156 1 10.58 0.2 adularia conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 11.4 1.742 6248 "1.768 X E-10, 1.716 X E-10 MOL/GM AR-40" AGE OF MINERALIZATION 4157 1 125 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04*" 8.36 15.5 SECONDARY BROWN MICA "AGE OF HYDROTHERMAL ALTERATION, AGE OF MINERALIZATION" 4158 1 3.41 0.1 sanidine conventional K-Ar W19-NO.1 "4.72E-04, 0.585E-04, 1.19E-04*" 10.5 0.5156 92 age of volcanism "10.51%, 10.49% K2O" 4158 2 3.47 0.24 biotite conventional K-Ar W19-NO.1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.385 0.3698 23 age of volcanism "7.38%, 7.39% K2O" 4158 3 3.27 0.1 sanidine conventional K-Ar W19-NO.2 "4.72E-04, 0.585E-04, 1.19E-04*" 10.555 0.4976 91 age of volcanism "10.59%, 10.52% K2O" 4158 4 3.54 0.17 biotite conventional K-Ar W19-NO.2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.73 0.3938 29 age of volcanism "7.70%, 7.76% K2O" 4159 1 3.55 0.14 biotite conventional K-Ar W20 "4.72E-04, 0.585E-04, 1.19E-04*" 8.195 0.419 33 age of volcanism "8.18%, 8.21% K2O" 4159 2 3.87 0.34 plagioclase conventional K-Ar W20 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6695 0.0373 18 age of volcanism "0.668%, 0.671% K2O" 4160 1 3.59 0.11 whole rock conventional K-Ar W21 "4.72E-04, 0.585E-04, 1.19E-04*" 1.83 0.0948 2929 age of volcanism "1.83%, 1.83% K2O; 0.949 X E-11, 0.946 X E-11 MOL/GM AR-40" 4161 1 7.08 0.19 whole rock conventional K-Ar W22 "4.72E-04, 0.585E-04, 1.19E-04*" 0.951 0.0971 6767 age of volcanism "0.948%, 0.964%, 0.961%, 0.932% K2O; 0.960 X E-11, 0.983 X E-11 MOL/GM AR-40" 4162 1 9.76 0.38 biotite conventional K-Ar W23 "4.72E-04, 0.585E-04, 1.19E-04*" 8.005 1.128 60 age of volcanism "7.97%, 8.04% K2O" 4163 1 44.05 2.1 biotite conventional K-Ar BO439 "4.72E-04, 0.585E-04, 1.19E-04*" 5.95 3.82 3558 age of volcanism "4.80%, 4.96%, AND 5.06% K; 0.0157 AND 0.0148 PPM AR-40" 4164 1 36.45 1 biotite conventional K-Ar BO124 "4.72E-04, 0.585E-04, 1.19E-04*" 7.49 3.97 3644 age of volcanism "6.18%, 6.25% K; 0.0161 AND 0.0156 PPM AR-40" 4165 1 41.24 2.3 biotite conventional K-Ar BO094 "4.72E-04, 0.585E-04, 1.19E-04*" 7.66 4.6 53 age of volcanism "6.36%, 6.36% K; 0.0184 PPM AR-40" 4166 1 2.79 0.8 plagioclase conventional K-Ar KA-2003 "4.72E-04, 0.584E-04, 1.19E-04*" 0.468 0.0188 7 age of volcanism REPLICATE K ANALYSES 4167 1 2.89 0.4 plagioclase conventional K-Ar KA-1859 "4.72E-04, 0.584E-04, 1.19E-04*" 0.411 0.0171 14 age of volcanism REPLICATE K ANALYSES 4168 1 2.72 0.2 biotite conventional K-Ar KA-1912 "4.72E-04, 0.584E-04, 1.19E-04*" 8.052 0.315 27 age of volcanism REPLICATE K ANALYSES 4169 1 4.64 0.2 whole rock conventional K-Ar KA-1866 "4.72E-04, 0.584E-04, 1.19E-04*" 1.215 0.0813 38 age of volcanism REPLICATE K ANALYSES 4170 1 3.76 0.1 whole rock conventional K-Ar KA-1867 "4.72E-04, 0.584E-04, 1.19E-04*" 1.662 0.09 43 age of volcanism REPLICATE K ANALYSES 4171 1 4.02 0.1 whole rock conventional K-Ar KA-1876 "4.72E-04, 0.584E-04, 1.19E-04*" 1.73 0.1002 43 age of volcanism REPLICATE K ANALYSES 4172 1 3.56 0.1 sanidine conventional K-Ar KA-1813 "4.72E-04, 0.584E-04, 1.19E-04*" 9.501 0.4876 76 age of volcanism REPLICATE K ANALYSES 4173 1 3.53 0.1 sanidine conventional K-Ar KA-1850 "4.72E-04, 0.584E-04, 1.19E-04*" 10.01 0.5095 81 age of volcanism REPLICATE K ANALYSES 4174 1 2.79 0.1 whole rock conventional K-Ar KA-2016 "4.72E-04, 0.584E-04, 1.19E-04*" 2.826 0.1136 31 age of volcanism REPLICATE K ANALYSES 4175 1 3.16 0.1 whole rock conventional K-Ar KA-2015 "4.72E-04, 0.584E-04, 1.19E-04*" 3.068 0.1395 66 age of volcanism REPLICATE K ANALYSES 4176 1 3.68 0.1 sanidine conventional K-Ar KA-2066 "4.72E-04, 0.584E-04, 1.19E-04*" 10.54 0.5594 85 age of volcanism REPLICATE K ANALYSES 4177 1 1.59 0.1 whole rock conventional K-Ar KA-2089 "4.72E-04, 0.584E-04, 1.19E-04*" 3.476 0.0798 27 age of volcanism REPLICATE K ANALYSES 4178 1 11.84 0.3 biotite conventional K-Ar KA-1852 "4.72E-04, 0.584E-04, 1.19E-04*" 8.067 1.38 65 age of volcanism REPLICATE K ANALYSES 4179 1 11.58 0.2 sanidine conventional K-Ar KA-1916 "4.72E-04, 0.584E-04, 1.19E-04*" 8.1 1.355 89 age of volcanism REPLICATE K ANALYSES 4179 2 11.89 0.2 plagioclase conventional K-Ar KA-1918 "4.72E-04, 0.584E-04, 1.19E-04*" 0.919 0.1579 56 age of volcanism REPLICATE K ANALYSES 4180 1 11.5 0.2 sanidine conventional K-Ar KA-1860 "4.72E-04, 0.584E-04, 1.19E-04*" 9.654 1.603 92 age of volcanism REPLICATE K ANALYSES 4181 1 11.54 0.2 biotite conventional K-Ar KA-1911 "4.72E-04, 0.584E-04, 1.19E-04*" 7.869 1.312 64 age of volcanism REPLICATE K ANALYSES 4182 1 12.85 0.3 plagioclase conventional K-Ar KA-2048 "4.72E-04, 0.584E-04, 1.19E-04*" 0.598 0.111 76 age of volcanism REPLICATE K ANALYSES 4183 1 22.58 0.4 sanidine conventional K-Ar KA-1979 "4.72E-04, 0.584E-04, 1.19E-04*" 10.02 3.278 70 age of volcanism REPLICATE K ANALYSES 4183 2 22.54 0.9 plagioclase conventional K-Ar KA-1989 "4.72E-04, 0.584E-04, 1.19E-04*" 0.656 0.2142 39 age of volcanism REPLICATE K ANALYSES 4184 1 22.59 0.3 sanidine conventional K-Ar KA-1970 "4.72E-04, 0.584E-04, 1.19E-04*" 9.7 3.175 95 age of volcanism REPLICATE K ANALYSES 4184 2 23.3 0.4 plagioclase conventional K-Ar KA-1988 "4.72E-04, 0.584E-04, 1.19E-04*" 0.492 0.1661 85 age of volcanism REPLICATE K ANALYSES 4184 3 24.63 0.7 biotite conventional K-Ar KA-2009 "4.72E-04, 0.584E-04, 1.19E-04*" 5.702 2.036 56 age of volcanism REPLICATE K ANALYSES 4185 1 24.17 0.5 plagioclase conventional K-Ar KA-2000 "4.72E-04, 0.584E-04, 1.19E-04*" 0.889 0.3114 95 age of volcanism REPLICATE K ANALYSES 4186 1 29.18 0.6 sanidine conventional K-Ar KA-2047 "4.72E-04, 0.584E-04, 1.19E-04*" 10.6 4.49 97 age of volcanism REPLICATE K ANALYSES 4188 1 17.75 0.8 plagioclase conventional K-Ar 2 (MZWT-1) "4.72E-04, 0.585E-04, 1.19E-04*" 1.57 0.4031 32 minimum age of volcanism AGE MAY BE RELATED TO ALTERATION OF ROCK BY HYDROTHERMAL SOLUTIONS 4190 1 18.55 0.5 K feldspar conventional K-Ar 4 (OWT-1) "4.72E-04, 0.585E-04, 1.19E-04*" 6.63 1.78 82 ALTERATION AGE 4191 1 25.81 0.8 biotite conventional K-Ar 5 (MC-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 3.084 66 age of volcanism 4191 2 24.68 0.7 plagioclase conventional K-Ar 4 (MC-1) "4.72E-04, 0.585E-04, 1.19E-04*" 2.51 0.8978 84 minimum age of volcanism 4192 1 26.46 0.8 biotite conventional K-Ar 6 (TAF2(1)) "4.72E-04, 0.585E-04, 1.19E-04*" 8.81 3.381 69 minimum age of volcanism "AGE IS IN AGREEMENT WITH OTHER K-AR AGES FOR TUFFS OF THIS UNIT (EKREN AND OTHERS, 1971)" 4194 1 21.06 0.8 biotite conventional K-Ar 8 (GC-135) "4.72E-04, 0.585E-04, 1.19E-04*" 8.71 2.656 66 age of volcanism THIS AGE AGREES WITH PREVIOUS K-AR AGE PUBLISHED BY BONHAM AND OTHERS (1972) FOR MIZPAH FORMATION 4195 1 17.29 0.5 biotite conventional K-Ar 10 (74 MLS-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 2.064 43 minimum age of volcanism AGE PROBABLY RESET BY LATER HYDROTHERMAL ALTERATION 4196 1 16.52 0.5 sanidine conventional K-Ar 11 (TFR2-1) "4.72E-04, 0.585E-04, 1.19E-04*" 11.03 2.636 77 minimum age of volcanism AGE PROBABLY RESET BY LATER HYDROTHERMAL ACTIVITY 4196 2 17.27 0.7 biotite conventional K-Ar 11 (TFR2-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 2.094 62 minimum age of volcanism AGE PROBABLY RESET BY LATER HYDROTHERMAL ACTIVITY 4197 1 20.1 0.4 glass conventional K-Ar 12 (SS-25) "4.72E-04, 0.585E-04, 1.19E-04*" 5.66 1.647 55 minimum age of volcanism 4198 1 20.41 0.6 K feldspar conventional K-Ar 13 (TV-2) "4.72E-04, 0.585E-04, 1.19E-04*" 6.26 1.85 66 age of volcanism 4199 1 20.18 0.6 K feldspar conventional K-Ar 14 (TFR-1) "4.72E-04, 0.585E-04, 1.19E-04*" 5.71 1.668 49 age of volcanism 4199 2 22.05 0.6 biotite conventional K-Ar 14 (TFR-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 2.74 65 maximum age of volcanism "AGE OLDER THAN AVERAGE AGE OF UNIT, POSSIBLY DUE TO CRYSTAL CONTAMINATION DURING ERUPTION" 4200 1 18.66 0.6 K feldspar conventional K-Ar 15 (TV-1) "4.72E-04, 0.585E-04, 1.19E-04*" 4.81 1.299 65 age of volcanism 4201 1 19.45 0.6 sanidine conventional K-Ar 17 (R-1) "4.72E-04, 0.585E-04, 1.19E-04*" 9.58 2.697 81 age of volcanism 4202 1 18.58 0.7 whole rock conventional K-Ar 18 (T-291) "4.72E-04, 0.585E-04, 1.19E-04*" 7.36 1.979 53 QUARTZ-ADULARIA-SERICITE INTERGROWTH AGE OF MINERALIZATION; AGE OF ALTERATION. THIS AGE IS A BIT YOUNGER THAN THE 19.1 M.Y. AGE REPORTED BY BONHAM AND OTHERS (1972) FOR VEIN ADULARIA FROM BELMONT MINE 4203 1 17.47 0.7 whole rock conventional K-Ar 20 (T-229) "4.72E-04, 0.585E-04, 1.19E-04*" 9.21 2.328 46 QUARTZ-ADULARIA-SERICITE INTERGROWTH AGE OF ALTERATION; AGE OF MINERALIZATION 4204 1 20.13 0.4 sanidine conventional K-Ar 21 (SIE-1) "4.72E-04, 0.585E-04, 1.19E-04*" 9.5 2.768 71 "AGE SEEMS TOO OLD, POSSIBLY DUE TO CONTAMINATION WITH OLDER FELDSPARS" 4204 2 16.49 1 biotite conventional K-Ar 21 (SIE-1) "4.72E-04, 0.585E-04, 1.19E-04*" 7.85 1.872 20 age of volcanism 4205 1 16.61 0.6 whole rock conventional K-Ar 22 (SIE-2) "4.72E-04, 0.585E-04, 1.19E-04*" 2.54 0.6101 66 age of volcanism 4206 1 20.47 1.2 K feldspar conventional K-Ar 23 (SIE-3A) "4.72E-04, 0.585E-04, 1.19E-04*" 2.15 0.6371 20 "AGE TOO OLD, POSSIBLE CONTAMINATION WITH OLDER FELDSPAR. SILBERMAN AND MCKEE (1972) REPORTED AN AGE OF 15.5 M.Y. FOR BIOTITE FROM TUFF IN THE SIEBERT FORMATION" 4207 1 17.26 0.5 biotite conventional K-Ar 25 (11550-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.49 2.12 42 age of volcanism 4208 1 16.88 0.5 biotite conventional K-Ar 25 (OD-1-BO) "4.72E-04, 0.585E-04, 1.19E-04*" 8.91 2.176 64 age of volcanism 4209 1 16.52 0.5 sanidine conventional K-Ar 28 (BQL-1) "4.72E-04, 0.585E-04, 1.19E-04*" 10.95 2.617 95 age of volcanism 4209 2 16.39 0.5 biotite conventional K-Ar 22 (BQL-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.67 2.055 60 age of volcanism 4210 1 14.55 0.4 K feldspar conventional K-Ar 29 (BQL-2) "4.72E-04, 0.585E-04, 1.19E-04*" 6.41 1.348 48 minimum age of volcanism DISCORDANT FELDSPAR AND BIOTITE K-AR AGES SUGGEST AGES HAVE BEEN EFFECTED BY A LATER THERMAL EVENT 4210 2 13.57 0.4 biotite conventional K-Ar 29 (BQL-2) "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 1.761 48 DISCORDANT BIOTITE AND FELDSPAR AGES SUGGEST AGES HAVE BEEN EFFECTED BY A LATER THERMAL EVENT 4211 1 17.25 0.5 biotite conventional K-Ar 30 (D-1) "4.72E-04, 0.585E-04, 1.19E-04*" 6.54 1.632 64 age of volcanism 4211 2 16.99 0.8 hornblende conventional K-Ar 30 (D-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.2113 58 age of volcanism POTASSIUM VALUE DETERMINED BY X-RAY FLUORESCENCE 4211 3 15.27 0.4 plagioclase conventional K-Ar 30 (D-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.495 0.1093 60 minimum age of volcanism VERMICULAR PLAGIOCLASE AGE APPEARS TOO YOUNG 4212 1 17.3 0.7 hornblende conventional K-Ar 31 (D-3) "4.72E-04, 0.585E-04, 1.19E-04*" 0.934 0.2338 33 age of volcanism 4213 1 16.32 0.5 whole rock conventional K-Ar 32 (L-1) "4.72E-04, 0.585E-04, 1.19E-04*" 3.94 0.9297 75 age of volcanism "K-AR AGES RANGE FROM 16.3 TO 14.8 M.Y. FOR SAMPLES OF THE ""VOLCANICS OF DONOVAN PEAK""" 4214 1 16.74 0.7 biotite conventional K-Ar 33 (FBR-2) "4.72E-04, 0.585E-04, 1.19E-04*" 8.46 2.048 42 age of volcanism "K-AR AGES RANGE FROM 16.3 TO 14.8 M.Y. FOR SAMPLES FROM ""VOLCANICS OF DONOVAN PEAK""" 4215 1 15.16 0.6 hornblende conventional K-Ar 34 (HL-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.862 0.1889 26 age of volcanism "K-AR AGES RANGE FROM 16.3 TO 14.8 M.Y. FOR SAMPLES FROM ""VOLCANICS OF DONOVAN PEAK""" 4216 1 16.07 0.2 sericite conventional K-Ar 35 (TD-2) "4.72E-04, 0.585E-04, 1.19E-04*" 2.322 0.5396 5952 "0.5392 X E-10, 0.5400 X E-10 MOL/GM 40AR-RAD" PROBABLE AGE OF ALTERATION 4217 1 15.64 0.6 sericite conventional K-Ar 36 (TD-3) "4.72E-04, 0.585E-04, 1.19E-04*" 5.86 1.325 37 AGE OF ALTERATION 4218 1 16.2 0.5 muscovite conventional K-Ar 37 (THA-6) "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 1.879 56 PROBABLE AGE OF ALTERATION 4219 1 16.87 0.5 whole rock conventional K-Ar 38 (THA-25R) "4.72E-04, 0.585E-04, 1.19E-04*" 5.61 1.369 48 "MIXTURE OF QUARTZ, ADULARIA, AND PYRITE" AGE OF HYDROTHERMAL ALTERATION 4219 2 16.72 0.5 adularia conventional K-Ar 38 (THA-25C) "4.72E-04, 0.585E-04, 1.19E-04*" 9.51 2.3 56 AGE OF HYDROTHERMAL ALTERATION 4220 1 16.08 0.6 hornblende conventional K-Ar 41 (LM-2) "4.72E-04, 0.585E-04, 1.19E-04*" 0.802 0.1865 31 age of volcanism 4220 2 17.07 0.8 plagioclase conventional K-Ar 41 (LM-2) "4.72E-04, 0.585E-04, 1.19E-04*" 0.375 0.0926 34 age of volcanism VERMICULAR PLAGIOCLASE 4221 1 16.18 0.5 hornblende conventional K-Ar 42 (LM-3) "4.72E-04, 0.585E-04, 1.19E-04*" 0.726 0.1699 40 age of volcanism 4222 1 16.19 0.5 whole rock conventional K-Ar 43 (TM-1) "4.72E-04, 0.585E-04, 1.19E-04*" 1.91 0.4473 54 age of volcanism CRUSHED TO -60+100 MESH THIS AGE MORE PRECISE THAN AGE OF 18.9 M.Y. FOR THIS UNIT REPORTED BY ARMSTRONG AND OTHERS (1972) 4223 1 15.52 0.5 hornblende conventional K-Ar 44 (RMB-2) "4.72E-04, 0.585E-04, 1.19E-04*" 0.891 0.2 45 age of volcanism THIS AGE MORE PRECISE THAN WHOLE-ROCK AGES OF 15.8+/-2 AND 17.9+/-3 M.Y. FOR THIS UNIT AS REPORTED BY ARMSTRONG AND OTHERS (1972) 4225 1 21.6 0.9 sanidine conventional K-Ar 1(AD-49) "4.962E-04, 0.581E-04, 1.1167E-04" 10.66 3.341 595737 age of volcanism "10.70%, 10.62% K2O; 3.593 E-10, 3.119 E-10, 3.310 E-10 MOL/GM AR-40" 4225 2 22.8 0.7 biotite conventional K-Ar 1(AD-49) "4.962E-04, 0.581E-04, 1.1167E-04" 7.25 2.397 3231 age of volcanism "7.24%, 7.26% K2O; 2.370 E-10, 2.423 E-10 MOL/GM" 4226 1 26.1 0.2 sanidine conventional K-Ar 2(NE-253A) "4.962E-04, 0.581E-04, 1.1167E-04" 9.43 3.567 97 age of volcanism 4227 1 25.1 0.8 sanidine conventional K-Ar 3(NE-238) "4.962E-04, 0.581E-04, 1.1167E-04" 10.855 3.947 78 age of volcanism "10.84%, 10.87% K2O" 4227 2 26.7 0.8 biotite conventional K-Ar 3(NE-238) "4.962E-04, 0.581E-04, 1.1167E-04" 7.36 2.851 81 age of volcanism "7.35%, 7.37% K2O" 4228 1 28 0.8 biotite conventional K-Ar 4(NE-205) "4.962E-04, 0.581E-04, 1.1167E-04" 8.515 3.462 56 age of volcanism "8.51%, 8.52% K2O" 4228 2 28.6 0.9 plagioclase conventional K-Ar 4(NE-205) "4.962E-04, 0.581E-04, 1.1167E-04" 0.925 0.3834 49 age of volcanism "0.927%, 0.923% K2O" 4229 1 7.51 0.4 whole rock conventional K-Ar ADSQ16 "4.72E-04, 0.585E-04, 1.19E-04*" 1.29 0.1397 26 age of volcanism "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4229 2 9.7 7.5 plagioclase conventional K-Ar ADSQ16 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN; HIGH ANALYTICAL UNCERTAINTY IS DUE TO PRESENCE OF LARGE AMOUNT OF ATMOSPHERIC ARGON 4230 1 13.7 2.2 plagioclase conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 4231 1 14.28 0.4 hornblende conventional K-Ar ADSQ10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.793 0.1637 58 age of intrusion "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4232 1 26.6 0.8 biotite conventional K-Ar ADSQ18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.18 3.156 71 age of volcanism "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA; AGE PUBLISHED AS 25.2 +/- 1.0 M.Y." 4233 1 22.55 0.5 biotite conventional K-Ar ADSQ13 "4.72E-04, 0.585E-04, 1.19E-04*" 8.56 2.796 68 age of volcanism "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" THIS AGE IS IN AGREEMENT WITH OTHER AGES ON SAME UNIT IN GILLIS-GABBS VALLEY RANGES TO THE EAST 4234 1 26.58 0.8 biotite conventional K-Ar ADSQ21 "4.72E-04, 0.585E-04, 1.19E-04*" 6.88 2.652 75 age of volcanism "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4234 2 26.26 0.8 hornblende conventional K-Ar ADSQ21 "4.72E-04, 0.585E-04, 1.19E-04*" 0.953 0.363 47 age of volcanism "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" MINERALS FROM OTHER SAMPLES OF THIS VOLCANIC UNIT GAVE OLDER AGES 4235 1 147.77 4 hornblende conventional K-Ar ADSQ44 "4.72E-04, 0.585E-04, 1.19E-04*" 0.673 1.492 92 minimum age of intrusion "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4236 1 116.45 5 hornblende conventional K-Ar ADSQ11 "4.72E-04, 0.585E-04, 1.19E-04*" 1.137 1.969 76 "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" "K-AR AGE OF HORNBLENDE IS LOW; ANOTHER HORNBLENDE CONCENTRATE GAVE A K-AR AGE OF 142 M.Y. (BINGLER, 1972)" 4236 2 80.94 2.4 biotite conventional K-Ar ADSQ11 "4.72E-04, 0.585E-04, 1.19E-04*" 5.7 6.793 86 "ANALYTICAL DATA RELEASED BY M.L. SILBERMAN, USGS" K-AR AGE OF BIOTITE HAS BEEN REDUCED BY LATER CRETACEOUS PLUTONISM 4237 1 142.76 4 biotite conventional K-Ar ADSQ38 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 17.71 94 minimum age of intrusion "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4238 1 157.48 5 hornblende conventional K-Ar ADSQ22 "4.72E-04, 0.585E-04, 1.19E-04*" 0.661 1.566 83 minimum age of intrusion "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4238 2 102.48 3 biotite conventional K-Ar ADSQ22 "4.72E-04, 0.585E-04, 1.19E-04*" 8.313 12.62 92 "ANALYTICAL DATA RELEASED BY M.L. SILBERMAN, USGS" K-AR AGE OF BIOTITE WAS PROBABLY REDUCED BY CRETACEOUS PLUTONISM 4239 1 138.41 4 hornblende conventional K-Ar ADSQ47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.956 1.98 91 minimum age of intrusion "ANALYTICAL DATA WAS RELEASED BY M.L. SILBERMAN, USGS, MENLO PARK, CALIFORNIA" 4239 2 81.83 2.4 biotite conventional K-Ar ADSQ47 "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 9.485 87 "ANALYTICAL DATA RELEASED BY M.L. SILBERMAN, USGS" K-AR AGE OF BIOTITE HAS BEEN REDUCED BY CRETACEOUS PLUTONISM 4240 1 18.9 0.8 plagioclase conventional K-Ar 1(CD-137) "4.962E-04, 0.581E-04, 1.1167E-04" 1.248 0.3412 29 age of intrusion 4241 1 22 0.7 plagioclase conventional K-Ar 2(CD-136) "4.962E-04, 0.581E-04, 1.1167E-04" 0.803 0.2558 49 age of volcanism 4242 1 24.2 0.7 biotite conventional K-Ar 3(CD-261) "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 3.007 51 age of volcanism 4242 2 24.8 1 plagioclase conventional K-Ar 3(CD-261) "4.962E-04, 0.581E-04, 1.1167E-04" 0.575 0.2064 23 age of volcanism 4243 1 73.9 2.2 K feldspar conventional K-Ar 4(4(CD-141) "4.962E-04, 0.581E-04, 1.1167E-04" 9.62 10.45 92 MICROPERTHITIC FELDSPAR AGE IS TOO LOW; MICROPERTHITIC FELDSPAR USUALLY LEAKS RADIOGENIC ARGON 4243 2 89.5 2.7 biotite conventional K-Ar A(CD-141) "4.962E-04, 0.581E-04, 1.1167E-04" 7.63 10.07 89 age of intrusion 4244 1 78.5 2.4 K feldspar conventional K-Ar 5(CD-140) "4.962E-04, 0.581E-04, 1.1167E-04" 10.49 12.11 79 MICROCLINE AGE TOO LOW; MICROCLINE HAS LOST RADIOGENIC ARGON 4244 2 92.8 2.8 biotite conventional K-Ar 5(CD-140) "4.962E-04, 0.581E-04, 1.1167E-04" 3.98 5.454 80 minimum age of intrusion HIGHLY CHLORITIZED 4244 3 70.3 2.1 plagioclase conventional K-Ar 5(CD-140) "4.962E-04, 0.581E-04, 1.1167E-04" 0.323 0.3336 47 VERY FINE TWINNING MAY HAVE LOST RADIOGENIC ARGON; AGE IS TOO LOW 4245 1 96.8 2.9 biotite conventional K-Ar 6(CD-139) "4.962E-04, 0.581E-04, 1.1167E-04" 7.3 10.45 89 age of intrusion 4245 2 91.5 4.6 hornblende conventional K-Ar 6(CD-139) "4.962E-04, 0.581E-04, 1.1167E-04" 2.57 3.464 86 HORNBLENDE CONCENTRATE CONTAINS SOME BIOTITE AR-40 VALUE MISTAKENLY LISTED AS 3.464 E-9 -- COMPILER AGE APPEARS TO BE TOO LOW 4246 1 101 4 biotite conventional K-Ar 7(SP-5) "4.962E-04, 0.581E-04, 1.1167E-04" 7.94 11.91 75 age of intrusion AGE ORIGINALLY REPORTED BY GEOCHRON AS 98.6 +/-3.6 M.Y. USING OLD CONSTANTS 4247 1 77.7 1 biotite conventional K-Ar USGS(M)-WC-1-560 "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 10.209 93 minimum age of intrusion "8.920%, 8.940% K2O" ALTERATION MAY HAVE SIGNIFICANTLY LOWERED AGE 4248 1 85.7 0.9 biotite conventional K-Ar USGS(M)-RWT-129-73 "4.962E-04, 0.581E-04, 1.1167E-04" 9.09 11.48 86 age of metamorphic crystallization "9.12%, 9.08%, 9.06% K2O" MAY BE AGE OF BATHOLITH (GRANODIORITE) 200 METERS AWAY 4249 1 110 5 biotite conventional K-Ar USGS(D)-PS64B-13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.5 13.9 94 age of intrusion "8.43%, 8.57% K2O" "AGE OF 108 M.Y. (OLD DECAY CONSTANTS) WAS REPORTED BY NOLAN, MERRIAM, AND BLAKE (1974) FOR THIS SAMPLE" 4250 1 20.7 0.8 plagioclase conventional K-Ar USGS(M)-B67-48 "4.962E-04, 0.581E-04, 1.1167E-04" 0.83 0.249 48 age of volcanism "AGE OF 20.2 M.Y. (OLD DECAY CONSTANTS) WAS REPORTED BY NOLAN, MERRIAM, AND BLAKE (1974) FOR THIS SAMPLE" 4251 1 102 3 biotite conventional K-Ar USGS(D)-PS64B-14 "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 12.5 96 age of intrusion "AGE OF 99.5 M.Y. (OLD DECAY CONSTANTS) WAS REPORTED BY NOLAN, MERRIAM, AND BLAKE (1974) FOR THIS SAMPLE" 4252 1 34.1 1.5 biotite conventional K-Ar USGS(D)-BP64B-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.36 4.14 80 age of intrusion "8.37%, 8.35% K2O" 4253 1 17.2 0.6 sanidine conventional K-Ar USGS(D)-UE6E-1344.5(B) "4.962E-04, 0.581E-04, 1.1167E-04" 7.255 1.809 84 "sample contains inherited material, age is too old" -60 +150 MESH "7.25%, 7.26% K2O" "SAMPLE CONTAMINATED WITH OLDER FELDSPAR; AGE TOO OLD, SHOULD BE ABOUT 9.5 M.Y. THE AGES OF THIS SAMPLE ILLUSTRATE THE CONTAMINATION PROBLEM PRESENT IN WATER-LAIN OR LOOSE TUFF MATERIALS" 4253 2 12.8 0.4 sanidine conventional K-Ar USGS(D)-UE6E-1344.5(B) "4.962E-04, 0.581E-04, 1.1167E-04" 7.585 1.399 76 "maximum age of volcanism, sample contains excess radiogenic argon, age is too old" -60 +100 MESH UP-GRADED SAMPLE "7.61%, 7.56% K2O" 4253 3 31 0.7 sanidine conventional K-Ar USGS(D)-UE6E-1344.5(B) "4.962E-04, 0.581E-04, 1.1167E-04" 7.96 3.579 91 "sample contains inherited material, age is too old" -100 +150 MESH UP-GRADED SAMPLE "7.95%, 7.97% K2O" 4254 1 5.7 0.2 whole rock conventional K-Ar USGS(D)-73-RCB-7 "4.962E-04, 0.581E-04, 1.1167E-04" 3.24 0.2682 61 age of volcanism "3.25%, 3.23% K2O" "AGE OF 5.6 M.Y. (OLD DECAY CONSTANTS) WAS REPORTED BY EKREN, BUCKNAM, CARR, DIXON, AND QUINLIVAN (1976) FOR THIS SAMPLE" 4255 1 92.4 2.2 biotite conventional K-Ar USGS(D)-3-67F "4.962E-04, 0.581E-04, 1.1167E-04" 7.975 10.89 93 age of intrusion "8.00%, 7.95% K2O" 4256 1 27.1 0.7 biotite conventional K-Ar USGS(D)-LFL-66-GLD-71 "4.962E-04, 0.581E-04, 1.1167E-04" 7.645 3.008 76 age of volcanism K2O BY ISOTOPE DILUTION "AGE OF 26.5 M.Y. (OLD DECAY CONSTANTS) WAS REPORTED BY EKREN, BATH, DIXON, HEALY, AND QUINLIVAN (1974) FOR THIS SAMPLE" 4257 1 11.1 0.4 biotite conventional K-Ar USGS(D)-0-1-51 "4.962E-04, 0.581E-04, 1.1167E-04" 8.775 1.407 62 maximum age of volcanism "8.78%, 8.77% K2O" THIS AGE APPEARS TOO OLD BASED UPON STRATIGRAPHIC RELATIONSHIPS 4258 1 161 4 biotite conventional K-Ar USGS(D)-MC-74-BE-882 "4.962E-04, 0.581E-04, 1.1167E-04" 7.395 17.93 93 age of intrusion "7.36%, 7.43% K20" 4258 2 158 7 hornblende conventional K-Ar USGS(D)-MC-74-BE-882 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5 1.189 86 age of intrusion "0.49%, 0.51% K20" 4259 1 25.9 0.9 sanidine conventional K-Ar USGS(D)-MC-74-BE-762A "4.962E-04, 0.581E-04, 1.1167E-04" 8.885 3.338 89 age of volcanism "8.90%, 8.87% K2O" 4262 1 29 Unk NOT GIVEN no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 4263 1 71.4 3 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4264 1 73 adularia conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE OF MINERALIZATION 4265 1 22.91 0.8 sanidine conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 13.79 4.577 47 minimum age of volcanism ONE OF TWO SANIDINE CONCENTRATES 4265 2 23.3 0.8 sanidine conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 11.37 3.838 56 minimum age of volcanism ONE OF TWO SANIDINE CONCENTRATES 4266 1 27.43 1 hornblende conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 2.385 0.949 49 age of volcanism "2.37%, 2.40% K20" 4267 1 23.35 0.8 sanidine conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 12.19 4.125 56 age of volcanism 4268 1 30.2 0.8 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 6.8 2.981 66 "AGE APPEARS TO BE TOO OLD, OLDER THAN THE TUFFS THE DIKE INTRUDES" 4269 1 55.21 1.5 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 7.29 5.884 83 minimum age of intrusion PLUTON IS PROBABLY LATE CRETACEOUS IN AGE 4270 1 110.15 3 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 13.9 94 age of intrusion LAB. NO. D1228B (PS64B-31) - COMPILER "8.43%, 8.57% K20" "AGE PUBLISHED BY HOSE, BLAKE, AND SMITH (1976) AND ALSO BY NOLAN, MERRIAM, AND BLAKE (1974)" 4271 1 whole rock NOT GIVEN "A K-AR AGE OF 72 M.Y. WAS REPORTED MISTAKENLY FOR A SAMPLE FROM THE KERN MOUNTAINS. THE AGE ACTUALLY RESULTED FROM A 2-POINT WHOLE-ROCK RB-SR ISOCHRON. THIS AGE WAS REPORTED BY HOSE, BLAKE, AND SMITH (1976) WITH NO ANALYTICAL DATA GIVEN." 4273 1 34 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4274 1 58 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY E.H. MCKEE, USGS, IN 1975" 4275 1 152 hornblende conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY E.H. MCKEE, USGS, IN 1975" 4275 2 155 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY E.H. MCKEE, USGS, IN 1975" 4276 1 148 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4277 1 38 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4278 1 106 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4279 1 104 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4279 2 103 hornblende conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4280 1 24 sanidine conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4281 1 24 whole rock conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4282 1 15 plagioclase conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "UNPUBLISHED DATA PRODUCED BY M.L. SILBERMAN, USGS" 4283 1 124 hornblende conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4284 1 180 hornblende conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4285 1 145 Unk conventional K-Ar NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN; MAY BE AVERAGE OF SEVERAL AGES "THIS AGE REPORTED AS 142 M.Y. (HORNBLENDE), 144 M.Y. (HORNBLENDE), 150 M.Y. (HORNBLENDE), AND 150 M.Y. (HORNBLENDE) IN CARLSON, LAIRD, PETERSON, SCHILLING, SILBERMAN, AND STEWART (1975)" 4286 1 98.4 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4287 1 96.4 biotite conventional K-Ar NOT GIVEN "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4288 1 155 Unk NOT GIVEN "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4289 1 40.13 2 biotite conventional K-Ar JG-GM-1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.36 4.3 85 age of intrusion 4289 2 40.41 2 biotite conventional K-Ar JG-GM-1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.36 4.33 89 age of intrusion 4290 1 1657.17 65 hornblende conventional K-Ar N-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.482 18.85 95 age of metamorphic crystallization 4292 1 923.27 microcline conventional K-Ar N-10 "4.72E-04, 0.585E-04, 1.19E-04*" 10.97 190.4 98 AGE TOO LOW 4292 2 1393.67 muscovite conventional K-Ar N-10 "4.72E-04, 0.585E-04, 1.19E-04*" 10.61 321.1 98 AGE IS TOO LOW 4293 1 1398.88 biotite conventional K-Ar N-11 "4.72E-04, 0.585E-04, 1.19E-04*" 9.38 285.4 97 age of intrusion 4295 1 1397.78 50 biotite conventional K-Ar N-17 "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 248 98 K-AR AGE IS TOO LOW 4296 1 1195.17 muscovite conventional K-Ar N-23 "4.72E-04, 0.585E-04, 1.19E-04*" 10.58 258.2 97 AGE IS TOO LOW 4297 1 794.02 microcline conventional K-Ar N-25 "4.72E-04, 0.585E-04, 1.19E-04*" 13.14 188.7 98 SPURIOUS AGE 4300 1 13.1 whole rock conventional K-Ar KA-1256 "4.72E-04, 0.585E-04, 1.19E-04" 0.664 50 age of volcanism "BASALT, CRUSHED AND LEACHED WITH HF" "0.551% K, ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN" 4301 1 10.8 plagioclase conventional K-Ar KA 1205 "4.72E-04, 0.585E-04, 1.19E-04" 0.189 37 age of volcanism 0.15% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4302 1 13.4 plagioclase conventional K-Ar KA-1300 "4.72E-04, 0.585E-04, 1.19E-04" 0.265 28 age of volcanism 0.220% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4303 1 10 plagioclase conventional K-Ar KA-1245 "4.72E-04, 0.585E-04, 1.19E-04" 0.2177 60 age of volcanism 0.1807% K; ARGON CONTENT AND ALALYTICAL ERROR NOT GIVEN 4304 1 12.4 plagioclase conventional K-Ar KA-1244 "4.72E-04, 0.585E-04, 1.19E-04" 0.6456 92 age of volcanism 0.5358% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4305 1 11 whole rock conventional K-Ar KA-1259 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4306 1 13.9 plagioclase conventional K-Ar KA-1261 "4.72E-04, 0.585E-04, 1.19E-04" 1.12 67 age of volcanism 0.933% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4307 1 15.9 plagioclase conventional K-Ar KA-1264 "4.72E-04, 0.585E-04, 1.19E-04" 0.648 70 age of volcanism 0.538 % K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4308 1 22.7 sanidine conventional K-Ar KA-1267 "4.72E-04, 0.585E-04, 1.19E-04" 9.154 93 age of volcanism 7.597% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4309 1 19.8 plagioclase conventional K-Ar KA-1273 "4.72E-04, 0.585E-04, 1.19E-04" 0.1795 48 "maximum age of volcanism, sample contains inherited material, age is too old" 0.149% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN CONTAINS OLDER DETRITAL FELDSPAR 4310 1 5.7 plagioclase conventional K-Ar KA-1286 "4.72E-04, 0.585E-04, 1.19E-04" 0.468 49 age of volcanism 0.388% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4311 1 22.8 sanidine conventional K-Ar KA-1288 "4.72E-04, 0.585E-04, 1.19E-04" 9.91 80 age of volcanism 8.225% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4311 2 22.7 plagioclase conventional K-Ar KA-1289 "4.72E-04, 0.585E-04, 1.19E-04" 1.04 71 age of volcanism 0.862% K; ARGON CONTENT AND ANALYTICAL ERROR NOT GIVEN 4313 1 155 biotite conventional K-Ar KA-840 "4.72E-04, 0.584E-04, 1.19E-04" 6.15 77 age of intrusion 5.10% K 4314 1 86.1 biotite conventional K-Ar KA-1516 "4.72E-04, 0.584E-04, 1.19E-04" 9.106 80 age of intrusion 16-28 MESH-SIZE GRAINS 7.557% K 4314 2 89.9 0.6 hornblende conventional K-Ar KA1516 "4.72E-04, 0.584E-04, 1.19E-04" 1.129 67 age of intrusion 28-60 MESH-SIZE GRAINS 0.937% K 4315 1 83.5 biotite conventional K-Ar KA-1517 "4.72E-04, 0.584E-04, 1.19E-04" 8.868 91 age of intrusion 10-16 MESH-SIZE GRAINS 7.359% K 4316 1 140.4 hornblende conventional K-Ar KA61-190 "4.72E-04, 0.584E-04, 1.19E-04" 0.886 91 age of intrusion 100-115 MESH-SIZE GRAINS 0.735% K 4317 1 89.1 hornblende conventional K-Ar KA61-191 "4.72E-04, 0.584E-04, 1.19E-04" 0.705 80 age of intrusion 100-115 MESH-SIZE GRAINS 0.585% K 4318 1 93.8 biotite conventional K-Ar KA61-007 "4.72E-04, 0.584E-04, 1.19E-04" 7.085 92 age of intrusion 60-80 MESH-SIZE GRAINS 5.880% K 4319 1 90.2 hornblende conventional K-Ar KA61-018 "4.72E-04, 0.584E-04, 1.19E-04" 0.617 58 age of intrusion 100-115 MESH-SIZE GRAINS 0.512% K 4320 1 84.3 hornblende conventional K-Ar KA61-022 "4.72E-04, 0.584E-04, 1.19E-04" 0.664 38 age of intrusion 100-115 MESH-SIZE GRAINS 0.551% K 4321 1 91.9 biotite conventional K-Ar KA71-002 "4.72E-04, 0.584E-04, 1.19E-04" 7.435 85 age of intrusion 60-80 MESH-SIZE GRAINS 6.170% K 4322 1 75.4 biotite conventional K-Ar KA71-006 "4.72E-04, 0.584E-04, 1.19E-04" 8.266 85 age of intrusion 60-80 MESH-SIZE GRAINS 6.860% K 4323 1 75.3 hornblende conventional K-Ar KA61-194 "4.72E-04, 0.584E-04, 1.19E-04" 0.495 73 age of intrusion 100-115 MESH-SIZE GRAINS 0.411% K 4324 1 86.1 biotite conventional K-Ar KA71-022 "4.72E-04, 0.584E-04, 1.19E-04" 9.821 79 age of intrusion 60-80 MESH-SIZE GRAINS 8.150% K 4325 1 100.5 hornblende conventional K-Ar KA61-196 "4.72E-04, 0.584E-04, 1.19E-04" 0.562 68 age of intrusion 100-150 MESH-SIZE GRAINS 0.466% K 4326 1 101.9 hornblende conventional K-Ar KA61-188 "4.72E-04, 0.584E-04, 1.19E-04" 0.675 73 age of intrusion 100-150 MESH SIZE GRAINS 0.560% K 4327 1 156.7 biotite conventional K-Ar KA61-005 "4.72E-04, 0.584E-04, 1.19E-04" 8.385 94 age of intrusion 80-100 MESH-SIZE GRAINS 6.960% K 4328 1 26.78 1.3 non-mineral substance conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 4.83 1.876 8584 age of volcanism NONHYDRATED GLASS (LISTED 3 M.Y. ANALYTICAL ERROR IS IN ERROR--COMPILER) "AGE ALSO PUBLISHED BY MARVIN, MEHNERT, AND MCKEE (1973), P. 9, NUMBER 37" 4329 1 26.18 0.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 2.973 87 age of volcanism "AGE ALSO PUBLISHED BY MARVIN, MEHNERT, AND MCKEE (1973), P. 10, NUMBER 42" 4329 2 23.06 0.7 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 11.72 3.916 97 age of volcanism "AGE ALSO PUBLISHED BY MARVIN, MEHNERT, AND MCKEE (1973), PAGE 10, NUMBER 42" 4330 1 26.74 0.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 3.304 75 age of volcanism 4330 2 25.31 0.7 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 4.56 1.673 85 age of volcanism 4331 1 26.04 0.6 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 3.24 77 age of volcanism 4331 2 24.44 0.6 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 5.42 1.92 85 age of volcanism 4332 1 23.12 0.7 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.21 2.75 60 age of volcanism 4333 1 31.66 3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 6.96 3.2 62 age of volcanism 4334 1 11.15 1 K feldspar conventional K-Ar 61ENH6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.74 1.246 71 age of volcanism 4335 1 126.82 6 biotite conventional K-Ar 57-W-51 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 16.04 93 "THIS IS PROBABLY A REDUCED AGE, INTRUSIVE IS PROBABLY JURASSIC" 4337 1 20.2 0.8 plagioclase conventional K-Ar B67-48 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4338 1 19.6 0.6 whole rock conventional K-Ar E-7 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4339 1 32.9 1.3 biotite conventional K-Ar PS65B-24 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4340 1 35.9 1.1 biotite conventional K-Ar PS65B-11 "4.72E-04, 0.585E-04, 1.19E-04*" 7.7 4.02 83 age of volcanism "7.74%, 7.66% K2O (AN AGE OF 35.0 M.Y. IS CALCULATED WITH THE ABOVE AR AND K VALUES--COMPILER)" 4341 1 103 2 muscovite conventional K-Ar E-3 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4342 1 101.57 3 biotite conventional K-Ar PS64B-14 "4.72E-04, 0.585E-04, 1.19E-04*" 8.31 12.5 96 age of intrusion "8.27%, 8.35% K2O" 4343 1 110.15 3 biotite conventional K-Ar PS64B-31 "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 13.9 94 age of intrusion "8.43%, 8.57% K2O" "AGE ALSO PUBLISHED BY HOSE, BLAKE, AND SMITH (1976)" 4344 1 39.8 1.6 plagioclase conventional K-Ar HG434 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE APPARENTLY TOO OLD; AVERAGE OF 5 OTHER K-AR AGES IS 34.5 M.Y. 4345 1 4.98 0.15 whole rock conventional K-Ar G294 "4.962E-04, 0.581E-04, 1.1167E-04" 0.367 0.0263 161917 age of volcanism "2.728 E-12, 2.47 E-12, AND 2.702 E-12 MOL/GM AR-40" 4346 1 14.6 0.4 biotite conventional K-Ar GC492 "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 1.824 70 age of volcanism 4347 1 14.3 0.4 sanidine conventional K-Ar GC15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.83 1.825 80 age of volcanism 4347 2 14.6 0.4 biotite conventional K-Ar GC15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 1.811 73 age of volcanism 4348 1 22.8 0.7 whole rock conventional K-Ar G1004 "4.962E-04, 0.581E-04, 1.1167E-04" 3.31 1.094 82 age of volcanism 4349 1 23.8 0.7 hornblende conventional K-Ar G1003 "4.962E-04, 0.581E-04, 1.1167E-04" 0.742 0.2554 52 age of volcanism 4350 1 24.2 0.7 sanidine conventional K-Ar GC331 "4.962E-04, 0.581E-04, 1.1167E-04" 6.36 2.229 62 age of volcanism 4351 1 25.2 0.8 sanidine conventional K-Ar GC501 "4.962E-04, 0.581E-04, 1.1167E-04" 4.4 1.611 51 age of volcanism 4352 1 25.9 0.8 sanidine conventional K-Ar GC479 "4.962E-04, 0.581E-04, 1.1167E-04" 6.6 2.481 54 age of volcanism 4353 1 106 3 biotite conventional K-Ar GC213 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 14.46 92 age of intrusion 4353 2 106 3 hornblende conventional K-Ar GC213 "4.962E-04, 0.581E-04, 1.1167E-04" 0.535 0.8405 88 age of intrusion 4354 1 102 3 amphiboles conventional K-Ar GC412 "4.962E-04, 0.581E-04, 1.1167E-04" 0.397 0.598 71 age of intrusion CLINOAMPHIBOLE 4355 1 104 3 muscovite conventional K-Ar G41 "4.962E-04, 0.581E-04, 1.1167E-04" 10.3 15.87 98 age of intrusion 4356 1 101 3 biotite conventional K-Ar IP24 "4.962E-04, 0.581E-04, 1.1167E-04" 3.82 5.727 95 minimum age of intrusion CHLORITIZED BIOTITE 4357 1 72.5 2.2 biotite conventional K-Ar G(GC10) "4.962E-04, 0.581E-04, 1.1167E-04" 5.39 5.733 75 minimum age of intrusion CHLORITIZED BIOTITE 4358 1 176 5 hornblende conventional K-Ar G127A "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 0.9303 70 age of intrusion 4359 1 42.9 1.3 biotite conventional K-Ar IP NEW CUT "4.962E-04, 0.581E-04, 1.1167E-04" 3.06 1.911 35 age not evaluated CHLORITIZED BIOTITE 4360 1 73.6 2.9 sericite conventional K-Ar SILVER COIN "4.962E-04, 0.581E-04, 1.1167E-04" 3.63 3.924 21 minimum age of intrusion MAY BE AGE OF FIRST OF TWO ALTERATION EVENTS 4360 2 15.1 0.5 jarosite conventional K-Ar SILVER COIN "4.962E-04, 0.581E-04, 1.1167E-04" 7.99 1.743 1011 SILVER-BEARING SILICEOUS JAROSITE COATING "1.798 E-10, 1.688 E-10 MOL/GM AR-40" MAY BE AGE OF SECOND OF TWO ALTERATION EVENTS (A MINERALIZATION EVENT) 4361 1 105 3 muscovite conventional K-Ar G52 "4.962E-04, 0.581E-04, 1.1167E-04" 8.59 13.3 92 METAMORPHIC AGE RESULTING FROM CRETACEOUS PLUTONISM 4362 1 92.7 2.8 hornblende conventional K-Ar GC-9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.68 0.9549 87 age of metamorphic crystallization 4363 1 86.2 2.6 whole rock conventional K-Ar GC212A "4.962E-04, 0.581E-04, 1.1167E-04" 1.268 1.612 88 minimum age of metamorphic crystallization "MAJOR PHASES CONTAINING K, PRINCIPALLY PLAGIOCLASE, BADLY ALTERED" 4364 1 88 2.6 biotite conventional K-Ar BS742 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 11.27 87 age of intrusion MAY ALSO BE AGE OF ALTERATION AND MINERALIZATION OF THE STOCK 4365 1 146 6 hornblende conventional K-Ar CG521 "4.962E-04, 0.581E-04, 1.1167E-04" 1.562 3.418 92 age of intrusion 4366 1 151 6 biotite conventional K-Ar BS740 "4.962E-04, 0.581E-04, 1.1167E-04" 8.98 20.4 93 age of intrusion 4367 1 153 6 biotite conventional K-Ar GC517A "4.962E-04, 0.581E-04, 1.1167E-04" 5.94 13.65 94 age of intrusion 4368 1 155 6 biotite conventional K-Ar GC519 "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 20.51 93 age of intrusion 4370 1 14.78 adularia conventional K-Ar 10 (J-2) "4.72E-04, 0.585E-04, 1.19E-04*" 10.35 2.212 82 "DATA WAS RELEASED BY M.L. SILBERMAN, USGS. CALCULATED AGE IS 14.4 +/-0.4 M.Y." AGE OF MINERALIZATION 4371 1 5.64 0.82 plagioclase conventional K-Ar W1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.339 0.0276 410 age of volcanism "0.321%, 0.361%, 0.335% K20; 0.0296 E-10, 0.0255 E-10 MOL/GM AR-40" 4372 1 6.85 0.33 plagioclase conventional K-Ar W2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.817 0.0807 29 age of volcanism "0.823%, 0.811% K2O" 4373 1 7.63 0.16 whole rock conventional K-Ar W3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.265 0.1392 6173 age of volcanism "1.26%, 1.27% K2O; 0.1387 E-10, 0.1397 E-10 MOL/GM AR-40" 4374 1 5.03 0.13 plagioclase conventional K-Ar W4 "4.72E-04, 0.585E-04, 1.19E-04" 0.754 0.462 37 age of volcanism "(*),0.751%, 0.757% K2O; 0.4697 E-10, 0.4544 E-10 MOL/GM AR-40" 4375 1 2.08 0.06 glass conventional K-Ar W5 "4.72E-04, 0.585E-04, 1.19E-04*" 4.57 0.1367 2836 age of volcanism OBSIDIAN "4.55%, 4.55%, 4.58%, 4.60% K2O; 0.1370 E-10, 0.1364 E-10 MOL/GM AR-40" 4376 1 6.81 0.17 plagioclase W6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.618 0.0608 3449 age of volcanism 10 4376 2 3.24 0.28 biotite conventional K-Ar W6 "4.72E-04, 0.585E-04, 1.19E-04*" 6.12 0.2857 18 "6.03%, 6.23%, 6.15%, 6.09% K2O" AGE IS TOO LOW DUE TO DEUTERIC ALTERATION 4377 1 9.1 0.19 plagioclase conventional K-Ar W7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6675 0.0876 4147 age of volcanism "0.666%, 0.669% K2O; 0.0874 E-10, 0.0879 E-10 MOL/GM AR-40" 4378 1 9.33 0.19 plagioclase conventional K-Ar W8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.641 0.0863 4650 age of volcanism "0.640%, 0.642% K2O; 0.0864 E-10, 0.0863 E-10 MOL/GM AR-40" 4379 1 8.68 0.38 plagioclase conventional K-Ar W9 "4.72E-04, 0.585E-04, 1.19E-04*" 0.69 0.0864 1415 age of volcanism "0.688%, 0.687%, 0.690%, 0.694% K2O; 0.0880 E-10, 0.0849 E-10 MOL/GM AR-40" 4380 1 3.77 0.12 plagioclase conventional K-Ar W10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.474 0.0257 2428 age of volcanism "O.474%, 0.474% K2O; 0.0255 E-10, 0.0260 E-10 MOL/GM AR-40" 4381 1 5.78 0.18 plagioclase conventional K-Ar W11 "4.72E-04, 0.585E-04, 1.19E-04*" 0.576 0.048 2728 age of volcanism "0.577%, 0.575% K2O; 0.0478 E-10, 0.0482 E-10 MOL/GM AR-40" 4382 1 2.81 0.08 sanidine conventional K-Ar W12 "4.72E-04, 0.585E-04, 1.19E-04*" 10.9 0.4413 81 age of volcanism "10.90%, 10.90% K2O" 4383 1 8.08 0.55 whole rock conventional K-Ar W13 "4.72E-04, 0.585E-04, 1.19E-04*" 0.374 0.0436 16 age of volcanism "0.373%, 0.375% K2O" 4383 2 8.02 0.55 whole rock conventional K-Ar W13 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3725 0.0431 16 "0.371%, 0.374% K2O" 4384 1 6.86 0.2 anorthoclase conventional K-Ar W14 "4.72E-04, 0.585E-04, 1.19E-04*" 4.975 0.4923 40 age of volcanism "5.00%, 4.95% K2O" 4385 1 6.1 0.18 anorthoclase conventional K-Ar W15 "4.72E-04, 0.585E-04, 1.19E-04*" 5.68 0.4998 48 age of volcanism "5.69%, 5.67% K2O" 4386 1 9.39 0.19 sanidine conventional K-Ar W16 "4.72E-04, 0.585E-04, 1.19E-04*" 7.25 0.9826 8181 age of volcanism "7.26%, 7.24% K2O; 0.9890 E-10, 0.9763 E-10 MOL/GM AR-40" 4387 1 16.22 0.4 sanidine conventional K-Ar W17 "4.72E-04, 0.585E-04, 1.19E-04*" 7.275 1.707 8084 age of volcanism "7.19%, 7.36% K2O; 1.709 E-10, 1.705 E-10 MOL/GM AR-40" 4388 1 13.91 0.28 sanidine conventional K-Ar W18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.565 1.722 7879 age of volcanism "8.51%, 8.62% K2O; 1.749 E-10, 1.695 E-10 MOL/GM AR-40" 4389 1 46.76 1.4 feldspar conventional K-Ar FO441 "4.72E-04, 0.585E-04, 1.19E-04*" 1.651 1.126 2326 age of volcanism "1.385%, 1.355% K; 0.00455 AND 0.00445 PPM AR-40" 4390 1 50.42 2 whole rock conventional K-Ar RO411 "4.72E-04, 0.585E-04, 1.19E-04*" 4.795 3.53 6367 age of volcanism "3.99%, 3.97% K; 0.0139 AND 0.0143 PPM AR-40" 4391 1 56.58 1.7 biotite conventional K-Ar BO445 "4.72E-04, 0.585E-04, 1.19E-04*" 6.785 5.615 5055 age of volcanism "5.65%, 5.61% K; 0.0230 AND 0.0219 PPM AR-40" 4392 1 40.69 3 feldspar conventional K-Ar FO457 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4625 0.274 1229 age of volcanism "0.381%, 0.387% K; 0.00114 AND 0.00105 PPM AR-40" 4393 1 11.76 0.3 biotite conventional K-Ar KA-1661 "4.72E-04, 0.584E-04, 1.19E-04*" 8.2 1.393 62 age of volcanism REPLICATE K ANALYSES 4394 1 11.51 0.3 biotite conventional K-Ar KA-1693 "4.72E-04, 0.584E-04, 1.19E-04*" 8.33 1.385 59 age of volcanism REPLICATE K ANALYSES 4395 1 10.53 0.7 biotite conventional K-Ar KA-1694 "4.72E-04, 0.584E-04, 1.19E-04*" 7.98 1.213 27 age of volcanism REPLICATE K ANALYSES 4396 1 4.27 2.1 whole rock conventional K-Ar KA-1811 "4.72E-04, 0.584E-04, 1.19E-04*" 1.292 0.0796 4 age of volcanism REPLICATE K ANALYSES 4397 1 3.34 0.1 biotite conventional K-Ar KA-1851 "4.72E-04, 0.584E-04, 1.19E-04*" 8.236 0.3966 59 age of volcanism REPLICATE K ANALYSES 4398 1 11.47 0.2 sanidine conventional K-Ar KA-1855 "4.72E-04, 0.584E-04, 1.19E-04*" 9.914 1.642 84 age of volcanism REPLICATE K ANALYSES 4399 1 11.34 0.2 sanidine conventional K-Ar KA-1856 "4.72E-04, 0.584E-04, 1.19E-04*" 7.729 1.266 85 age of volcanism REPLICATE K ANALYSES 4400 1 6.09 2.5 plagioclase conventional K-Ar KA-1857 "4.72E-04, 0.584E-04, 1.19E-04*" 0.459 0.0403 5 age of volcanism REPLICATE K ANALYSES 4401 1 12 0.8 plagioclase conventional K-Ar KA-1906 "4.72E-04, 0.584E-04, 1.19E-04*" 1.047 0.1815 28 age of volcanism REPLICATE K ANALYSES 4401 2 11.7 0.2 biotite conventional K-Ar KA-1915 "4.72E-04, 0.584E-04, 1.19E-04*" 8.169 1.381 68 age of volcanism REPLICATE K ANALYSES 4402 1 9.99 0.2 biotite conventional K-Ar KA-1907 "4.72E-04, 0.584E-04, 1.19E-04*" 7.757 1.119 67 age of volcanism REPLICATE K ANALYSES 4403 1 9.84 0.3 biotite conventional K-Ar KA-1908 "4.72E-04, 0.584E-04, 1.19E-04*" 7.814 1.11 54 age of volcanism REPLICATE K ANALYSES 4404 1 9.73 0.3 biotite conventional K-Ar KA-1909 "4.72E-04, 0.584E-04, 1.19E-04*" 7.904 1.11 49 age of volcanism REPLICATE K ANALYSES 4405 1 9.14 0.2 plagioclase conventional K-Ar KA-1972 "4.72E-04, 0.584E-04, 1.19E-04*" 0.67 0.0884 68 age of volcanism REPLICATE K ANALYSES 4406 1 8.03 0.2 plagioclase conventional K-Ar KA-1973 "4.72E-04, 0.584E-04, 1.19E-04*" 1.053 0.122 60 age of volcanism REPLICATE K ANALYSES 4407 1 22.9 0.3 sanidine conventional K-Ar KA-1974 "4.72E-04, 0.584E-04, 1.19E-04*" 10.662 3.531 95 age of volcanism REPLICATE K ANALYSES 4407 2 22.6 2 plagioclase conventional K-Ar KA-1987 "4.72E-04, 0.584E-04, 1.19E-04*" 0.39 0.1277 20 age of volcanism REPLICATE K ANALYSES 4408 1 3.26 0.7 plagioclase conventional K-Ar KA-1980 "4.72E-04, 0.584E-04, 1.19E-04*" 0.407 0.0191 9 age of volcanism REPLICATE K ANALYSES 4409 1 3.44 0.3 biotite conventional K-Ar KA-1984 "4.72E-04, 0.584E-04, 1.19E-04*" 7.382 0.3659 24 age of volcanism REPLICATE K ANALYSES 4409 2 3.15 0.3 biotite conventional K-Ar KA-1984R "4.72E-04, 0.584E-04, 1.19E-04*" 7.382 0.3346 20 age of volcanism REPLICATE K ANALYSES 4409 3 2.38 1.6 plagioclase conventional K-Ar KA-1993 "4.72E-04, 0.584E-04, 1.19E-04*" 0.431 0.0148 3 REPLICATE K ANALYSES AGE APPEARS TOO LOW BASED UPON BIOTITE AGES 4410 1 8.59 0.2 plagioclase conventional K-Ar KA-1990 "4.72E-04, 0.584E-04, 1.19E-04*" 0.725 0.0899 78 age of volcanism REPLICATE K ANALYSES 4411 1 9.75 0.3 plagioclase conventional K-Ar KA-1998 "4.72E-04, 0.584E-04, 1.19E-04*" 0.794 0.1118 55 age of volcanism REPLICATE K ANALYSES 4411 2 9.57 0.3 biotite conventional K-Ar KA-2049 "4.72E-04, 0.584E-04, 1.19E-04*" 8.43 1.165 50 age of volcanism REPLICATE K ANALYSES 4412 1 1.03 0.1 plagioclase conventional K-Ar KA-1999 "4.72E-04, 0.584E-04, 1.19E-04*" 0.699 0.0104 32 age of volcanism REPLICATE K ANALYSES 4413 1 2.59 0.3 plagioclase conventional K-Ar KA-2002 "4.72E-04, 0.584E-04, 1.19E-04*" 0.722 0.0269 17 age of volcanism REPLICATE K ANALYSES 4413 2 2.58 0.1 biotite conventional K-Ar KA-2004 "4.72E-04, 0.584E-04, 1.19E-04*" 8.493 0.3159 25 age of volcanism REPLICATE K ANALYSES 4414 1 26.39 0.5 sanidine conventional K-Ar KA-2044 "4.72E-04, 0.584E-04, 1.19E-04*" 10.738 4.1097 95 age of volcanism REPLICATE K ANALYSES 4415 1 12.14 0.2 sanidine conventional K-Ar KA-2045 "4.72E-04, 0.584E-04, 1.19E-04*" 9.903 1.736 92 age of volcanism REPLICATE K ANALYSES 4416 1 24.13 0.4 sanidine conventional K-Ar KA-2074 "4.72E-04, 0.584E-04, 1.19E-04*" 10.534 3.684 95 age of volcanism REPLICATE K ANALYSES 4417 1 3.72 0.4 plagioclase conventional K-Ar KA-2076 "4.72E-04, 0.584E-04, 1.19E-04*" 0.429 0.023 16 age of volcanism REPLICATE K ANALYSES 4418 1 0.92 0.1 sanidine conventional K-Ar KA-2081 "4.72E-04, 0.584E-04, 1.19E-04*" 8.833 0.117 61 age of volcanism REPLICATE K ANALYSES 4419 1 2.92 0.1 whole rock conventional K-Ar KA-2086 "4.72E-04, 0.584E-04, 1.19E-04*" 2.426 0.1019 46 age of volcanism REPLICATE K ANALYSES 4422 1 1669.41 hornblende conventional K-Ar U-6B "4.72E-04, 0.585E-04, 1.19E-04*" 0.49 19.38 93 age of metamorphic crystallization 4423 1 1632.86 hornblende conventional K-Ar A-3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.452 55.52 99 minimum age of intrusion 4431 1 1698.93 hornblende conventional K-Ar A-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.712 28.93 65 age of metamorphic crystallization 4432 1 1613.85 muscovite conventional K-Ar A-8A "4.72E-04, 0.585E-04, 1.19E-04*" 10.59 397.8 99 minimum age of intrusion 4440 1 1634.63 muscovite conventional K-Ar A-31 "4.72E-04, 0.585E-04, 1.19E-04*" 10.47 401 99 age of intrusion 4449 1 3 1.1 whole rock conventional K-Ar 1 USGS(D)-A-17 "4.962E-04, 0.581E-04, 1.1167E-04" 1.055 0.0458 44 minimum age of intrusion "1.06%, 1.05% K2O" 4450 1 33.9 1.1 whole rock conventional K-Ar 2 USGS(D)-A-U23 "4.962E-04, 0.581E-04, 1.1167E-04" 1.72 0.848 49 age not evaluated "1.74%, 1.70% K2O" 4451 1 6.2 0.4 whole rock conventional K-Ar 3 USGS(D)-A-KV4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.625 0.0562 38 minimum age of intrusion "0.63%, 0.62% K2O (LISTED AR-40 VALUE OF 0.562 MOL/GM IS AN ERROR)" 4452 1 243 0.8 whole rock conventional K-Ar 4 USGS(D)-A-A31 "4.962E-04, 0.581E-04, 1.1167E-04" 1.93 0.6793 43 age not evaluated "1.91%, 1.95% K2O" 4453 1 5.2 0.9 plagioclase conventional K-Ar 5 USGS(D)-A-S2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 0.0219 11 age not evaluated "0.29%, 0.29% K2O" 4454 1 55.3 6.7 plagioclase conventional K-Ar 6 USGS(D)-A-K18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.25 0.2023 49 age of volcanism "0.25%, 0.25% K2O" "THIS IS ONE OF THE OLDEST RADIOMETRIC AGES REPORTED FOR THIS AREA AND MAY SIGNIFY THE AGE OF THE ""BASEMENT ROCKS""" 4455 1 14.7 1.2 plagioclase conventional K-Ar 7 USGS(D)-WC-89-70 "4.962E-04, 0.581E-04, 1.1167E-04" 0.32 0.0681 25 age not evaluated "0.32%, 0.32% K2O" 4456 1 17.8 1.1 plagioclase conventional K-Ar 8 USGS(D)-KI-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.247 22 age not evaluated "0.96%, 0.96% K2O" 4457 1 64.7 3 sanidine conventional K-Ar 9 USGS(M)-62AHR-77 "4.962E-04, 0.581E-04, 1.1167E-04" 7.94 7.526 80 age of intrusion "7.93%, 7.95% K2O" 4458 1 128 4 hornblende conventional K-Ar 10 USGS(M)-62AHR-79 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 1.186 84 age of intrusion 4459 1 70.9 3.3 biotite conventional K-Ar 11 USGS(M)-63ACO-254 "4.962E-04, 0.581E-04, 1.1167E-04" 7.22 7.519 81 age of intrusion "7.08%, 7.36% K2O" 4460 1 120 3 biotite conventional K-Ar 12 USGS(M)-63ACO-414 "4.962E-04, 0.581E-04, 1.1167E-04" 8.52 15.24 89 age of intrusion "8.48%, 8.55% K2O" 4461 1 1235 60 biotite conventional K-Ar 13 USGS(W)-123 "4.962E-04, 0.581E-04, 1.1167E-04" 7.97 203.7 97 "THIS IS A REDUCED AGE; INITIAL CRYSTALLIZATION OF THE BRADY BUTTE GRANODIORITE OCCURRED 1770 M.Y. AGO (ANDERSON AND OTHERS, 1971)" 4462 1 1270 60 biotite conventional K-Ar 14 USGS(W)-550 "4.962E-04, 0.581E-04, 1.1167E-04" 8.44 224.2 100 "THIS IS A REDUCED AGE; INITIAL CRYSTALLIZATION OF THE BRADY BUTTE GRANODIORITE OCCURRED 1770 M.Y. AGO (ANDERSON AND OTHERS, 1971)" 4463 1 1670 80 biotite conventional K-Ar 15 USGS(W)-CAA-2 "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 310.7 100 minimum age of intrusion "A ZIRCON U-PB AGE OF 1760 +/-15 M.Y. FOR THE GRANODIORITE HAS BEEN DETERMINED (ANDERSON AND OTHERS, 1971)" 4465 1 1360 40 biotite conventional K-Ar 17 USGS(D)-CAA-6 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 250.2 99 minimum age of intrusion "8.62%, 8.47% K2O" 4468 1 25 0.8 biotite conventional K-Ar 20 USGS(D)-73D52 "4.962E-04, 0.581E-04, 1.1167E-04" 6.445 2.338 71 "6.42%, 6.47% K2O" "AGE IS SIMILAR TO PUBLISHED AGES (MARVIN AND OTHERS, 1973, P. 20) FOR ROCKS IN THE RINCON MOUNTAINS SUGGESTING A STRONG THERMAL EVENT AT THIS TIME ALTHOUGH ROCK IS PROBABLY 1400-1500 M.Y. OLD. DREWES (1977, USGS MAP I-997) PUBLISHED AN AGE OF 24.4 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED." 4469 1 1340 60 biotite conventional K-Ar 21 USGS(D)-74D62 "4.962E-04, 0.581E-04, 1.1167E-04" 6.67 190.6 99 minimum age of intrusion "6.61%, 6.73% K2O" "DREWES (1977, MAP I-997) PUBLISHED AN AGE OF 1380 M.Y. FOR THIS BIOTITE." 4469 2 1415 50 muscovite conventional K-Ar 21 USGS(D)-74D62 "4.962E-04, 0.581E-04, 1.1167E-04" 7.665 236.8 99 age of intrusion "7.67%, 7.66% K2O" "DREWES (1977, MAP I-977) PUBLISHED AN AGE OF 1400 M.Y. FOR THIS MUSCOVITE; DECAY CONSTANT SINCE REVISED." 4470 1 1395 50 biotite conventional K-Ar 22 USGS(D)-74D57 "4.962E-04, 0.581E-04, 1.1167E-04" 7.93 240.5 100 age of intrusion "7.90%, 7.96% K2O" DREWES (USGS MAP I-997) PUBLISHED AN AGE OF 1390 M.Y. FOR THIS BIOTITE; DECAY CONSTANT SINCE REVISED. 4470 2 1390 50 muscovite conventional K-Ar 22 USGS(D)-74D57 "4.962E-04, 0.581E-04, 1.1167E-04" 6.665 200.4 99 age of intrusion "6.67%, 6.66% K2O" DREWES (USGS MAP I-997) PUBLISHED AN AGE OF 1380 M.Y. FOR THIS MUSCOVITE; DECAY CONSTANT SINCE REVISED. 4471 1 27.6 0.9 biotite conventional K-Ar 23 USGS(D)-71D194 "4.962E-04, 0.581E-04, 1.1167E-04" 9.01 3.609 78 "9.03%, 8.99% K2O" "AGE AGREES WITH PUBLISHED AGES (MARVIN AND OTHERS, 1973, P. 20) FOR ROCKS IN SOUTHERN RINCON MOUNTAINS AND SUGGESTS A STRONG THERMAL EVENT DURING LATE OLIGOCENE TIME. QUARTZ MONZONITE IS PROBABLY 1400-1500 M.Y. OLD. DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 27.0 M.Y. FOR THIS BIOTITE; DECAY CONSTANT SINCE REVISED." 4471 2 28.5 0.6 muscovite conventional K-Ar 23 USGS(D)-71D194 "4.962E-04, 0.581E-04, 1.1167E-04" 10.175 4.211 89 "10.18%, 10.17% K2O" SEE COMMENTS UNDER BIOTITE AGE. DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 27.9 M.Y. FOR THIS MUSCOVITE; DECAY CONSTANT SINCE REVISED. 4472 1 149 5 biotite conventional K-Ar 24 USGS(D)-72D69 "4.962E-04, 0.581E-04, 1.1167E-04" 7.775 17.33 70 age of intrusion "7.82%, 7.73% K2O" DREWES AND COOPER (1973) PUBLISHED AN AGE OF 145 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4473 1 149 3 biotite conventional K-Ar 25 USGS(D)-74D84 "4.962E-04, 0.581E-04, 1.1167E-04" 5.18 11.55 89 age of intrusion "5.21%, 5.15% K2O" DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 145 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4474 1 76.3 1.8 biotite conventional K-Ar 26 USGS(D)-74D91 "4.962E-04, 0.581E-04, 1.1167E-04" 8.675 9.741 90 age of intrusion "8.67%, 8.68% K2O" DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 74.6 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4475 1 185 4 biotite conventional K-Ar 27 USGS(D)-74D102 "4.962E-04, 0.581E-04, 1.1167E-04" 7.545 21.12 89 age of intrusion SOME CHLORITE PRESENT "7.52%, 7.57% K2O" "THIS AGE IS IN AGREEMENT WITH THE 178 M.Y. AGE FOR THE GLEESON QUARTZ MONZONITE (ANDERSON, 1968). DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 181 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED." 4476 1 65.1 1.6 sanidine conventional K-Ar 28 USGS(D)-74D143 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 8.779 96 age of intrusion "9.21%, 9.19% K2O" DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 63.6 M.Y. FOR THIS SANIDINE; DECAY CONSTANT SINCE REVISED. 4476 2 66.6 1.6 biotite conventional K-Ar 28 USGS(D)-74D143 "4.962E-04, 0.581E-04, 1.1167E-04" 8.395 8.201 90 age of intrusion "8.39%, 8.40% K2O" DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 65.1 M.Y. FOR THIS BIOTITE; DECAY CONSTANT SINACE REVISED. 4477 1 34.5 1.5 hornblende conventional K-Ar 29 USGS(D)-74D161 "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 0.3308 54 age of volcanism MINOR AMOUNT OF EPIDOTE (DEUTERIC?) PRESENT IN THE HORNBLENDE; EPIDOTE HAS 0.05% K2O "0.66%, 0.66% K2O" DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 33.7 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4478 1 34 0.8 biotite conventional K-Ar 30 USGS(D)-74D151 "4.962E-04, 0.581E-04, 1.1167E-04" 8.32 4.114 58 age of intrusion "8.32%, 8.32% K2O" DREWES (USGS MAP I-1109) PUBLISHED AN AGE OF 33.2 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4479 1 1 0.1 plagioclase conventional K-Ar 31 USGS(D)-72D6 "4.962E-04, 0.581E-04, 1.1167E-04" 2.095 0.0295 27 age of volcanism "2.09%, 2.10% K2O" 4480 1 9.9 0.5 whole rock conventional K-Ar 32 USGS(D)-HLV-100 "4.962E-04, 0.581E-04, 1.1167E-04" 2.485 0.3549 59 age of intrusion 4481 1 35.2 1.5 whole rock conventional K-Ar 33 R-3502 "4.962E-04, 0.581E-04, 1.1167E-04" 3.249 1.663 22 age of volcanism -40 +100 MESH REPLICATE ANALYSES OF K AND AR AGE FITS WELL WITH ESTABLISHED GEOCHRONOLOGIC FRAMEWORK OF THE THIRTY-NINE MILE VOLCANIC FIELD. 4482 1 36.3 0.9 biotite conventional K-Ar 34 USGS(D)-A "4.962E-04, 0.581E-04, 1.1167E-04" 8.81 4.655 94 age of volcanism "8.81%, 8.81% K2O" 4483 1 37 2 whole rock conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 3.92 2.119 8080 age of intrusion "3.915%, 3.915% K2O; 2.186 AND 2.053 E-10 MOL/GM AR-40" OLSON AND DELLECHAIE (1976) PUBLISHED AN AGE OF 36 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4484 1 26.2 1 whole rock conventional K-Ar 36 "4.962E-04, 0.581E-04, 1.1167E-04" 3.8 1.446 8340 minimum age of intrusion "3.795%, 3.81% K2O; 1.410 AMD 1.481 E-10 MOL/GM AR-40" OLSON AND DELLECHAIE (1976) PUBLISHED AN AGE OF 25.4 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4485 1 25 1 whole rock conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 4.4 1.571 8386 age of intrusion "4.40%, 4.40% K2O; 1.620 AND 1.522 E-10 MOL/GM AR-40" OLSON AND DELLECHAIE (1976) PUBLISHED AN AGE OF 24 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4486 1 22 1 whole rock conventional K-Ar 38 "4.962E-04, 0.581E-04, 1.1167E-04" 5.17 1.678 5861 age of volcanism "5.18%, 5.16% K2O, 1.696 AND 1.660 E-10 MOL/GM AR-40" AGE QUOTED BY OLSON AND DELLECHAIE (1976) 4487 1 175 6 plagioclase conventional K-Ar 39 USGS(D)-PL4 "4.962E-04, 0.581E-04, 1.1167E-04" 3.55 9.386 92 "3.54%, 3.56% K2O" THE PURCELL LAVA IS PRECAMBRIAN IN AGE; THE APPARENT JURASSIC AGE IS OBVIOUSLY IN ERROR. 4488 1 31.2 1.1 biotite conventional K-Ar 55 USGS(D)-T-10 "4.962E-04, 0.581E-04, 1.1167E-04" 8.36 3.787 76 age of intrusion "8.33%, 8.39% K2O" FINNEL (1976) PUBLISHED AN AGE OF 30.5 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED 4489 1 31 1 biotite conventional K-Ar 56 USGS(D)-T-44 "4.962E-04, 0.581E-04, 1.1167E-04" 7.83 3.523 54 age of volcanism "7.83%, 7.83% K2O" 4490 1 31.5 1 biotite conventional K-Ar 57 USGS(D)-T-47 "4.962E-04, 0.581E-04, 1.1167E-04" 8.29 3.796 86 age of intrusion "8.28%, 8.30% K2O" FINNEL (1976) PUBLISHED AN AGE OF 30.8 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4491 1 26.4 0.9 sanidine conventional K-Ar 58 USGS(D)-T-13 "4.962E-04, 0.581E-04, 1.1167E-04" 4.715 1.805 88 minimum age of volcanism "4.72%, 4.71% K2O" FINNELL (1976) PUBLISHED AN AGE OF 26.4 M.Y. FOR THIS SANIDINE; DECAY CONSTANT SINCE REVISED. 4491 2 30 1 biotite conventional K-Ar 58 USGS(D)-T-13 "4.962E-04, 0.581E-04, 1.1167E-04" 6.32 2.747 71 age of volcanism "6.30%, 6.34% K2O" FINNELL (1976) PUBLISHED AN AGE OF 29.2 M.Y. FOR THIS BIOTITE; DECAY CONSTANT SINCE REVISED. 4492 1 31.9 1.1 biotite conventional K-Ar 59 USGS(D)-T-35 "4.962E-04, 0.581E-04, 1.1167E-04" 8.14 3.771 74 age of volcanism "8.11%, 8.17% K2O" FINNELL (1976) PUBLISHED AN AGE OF 31.1 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4493 1 31.7 1.1 biotite conventional K-Ar 60 USGS(D)-T-48 "4.962E-04, 0.581E-04, 1.1167E-04" 6.86 3.157 87 age of volcanism "6.86%, 6.86% K2O" FINNELL (1976) PUBLISHED AN AGE OF 30.9 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4494 1 32 0.9 biotite conventional K-Ar 61 USGS(D)-MB-6-66 "4.962E-04, 0.581E-04, 1.1167E-04" 7.35 3.41 56 age of volcanism "FINNELL (1976) PUBLISHED AN AGE OF 31.2 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. ANALYTICAL DATA PUBLISHED BY DAMON AND OTHERS (1967, P. 63-69)." 4495 1 35.7 1.2 biotite conventional K-Ar 62 USGS(D)-SL-57-73 "4.962E-04, 0.581E-04, 1.1167E-04" 7.535 3.908 84 age of intrusion "7.58%, 7.49% K2O" 4495 2 33.3 1.2 sanidine conventional K-Ar 62 USGS(D)-SL-57-73 "4.962E-04, 0.581E-04, 1.1167E-04" 7.42 3.593 87 age of intrusion "7.36%, 7.48% K2O" 4495 3 34.7 0.8 sanidine conventional K-Ar 62 USGS(D)-SL-57-73 "4.962E-04, 0.581E-04, 1.1167E-04" 7.42 3.746 93 age of intrusion "7.36%, 7.48% K2O" 4496 1 37.3 2.3 hornblende conventional K-Ar 63 USGS(D)-SL-210-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.3473 53 age of volcanism HORNBLENDE WITH A SURFACE FILM OF FERRIC OXIDE "0.64%, 0.64% K2O" HEDLUND (1976) PUBLISHED AN AGE OF 36.4 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4497 1 33.4 2.1 andesine conventional K-Ar 64 USGS(D)-SL-39A-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 0.3199 69 maximum age of volcanism RATHER ALTERED ANDESINE (AN 43-45) "0.66%, 0.66% K2O" AGE OF THE RUBIO PEAK FORMATION IS PROBABLY CLOSER TO 36-37 M.Y.. HEDLUND (1976) PUBLLISHED AN AGE OF 32.6 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4498 1 75.1 2.5 biotite conventional K-Ar 65 USGS(D)-HL-24-72 "4.962E-04, 0.581E-04, 1.1167E-04" 7.365 8.131 92 minimum age of intrusion "7.38%, 7.35% K2O" POSSIBLE AGE OF MINERALIZATION. HEDLUND (1975) PUBLISHED AN AGE OF 73.4 M.Y. FOR THIS SAMPLE; DECAY CONSTANT SINCE REVISED. 4499 1 34.6 0.8 biotite conventional K-Ar 66 USGS(D)-CB-268-B-75 "4.962E-04, 0.581E-04, 1.1167E-04" 7.965 4.001 79 age of volcanism "7.94%, 7.99% K2O" 4503 1 218 5 biotite conventional K-Ar 70 USGS(D)-72FP69 "4.962E-04, 0.581E-04, 1.1167E-04" 7.73 25.77 96 minimum age of intrusion "7.73%, 7.73% K2O" 4504 1 30.4 1.2 biotite conventional K-Ar 71 USGS(D)-N-R-S "4.962E-04, 0.581E-04, 1.1167E-04" 8.32 3.678 81 age of volcanism 4504 2 30.6 1.2 hornblende conventional K-Ar 71 USGS(D)-N-R-S "4.962E-04, 0.581E-04, 1.1167E-04" 0.995 0.4423 56 age of volcanism 4505 1 28.7 1.1 biotite conventional K-Ar USGS(D)-O-R-S "4.962E-04, 0.581E-04, 1.1167E-04" 7.82 3.259 57 age of volcanism 4505 2 29.8 1.2 hornblende conventional K-Ar 72 USGS(D)-O-R-S "4.962E-04, 0.581E-04, 1.1167E-04" 0.85 0.3672 65 age of volcanism 4506 1 27.2 1.1 hornblende conventional K-Ar 73 USGS(D)-T-R-S "4.962E-04, 0.581E-04, 1.1167E-04" 0.829 0.3267 48 age of volcanism 4507 1 32 0.6 whole rock conventional K-Ar 74 USGS(M)-RWT-59-72A "4.962E-04, 0.581E-04, 1.1167E-04" 2.2485 1.0437 64 age of metamorphic crystallization -100 MESH FRACTION "2.250%, 2.247% K2O" 4507 2 63.7 1.2 whole rock conventional K-Ar 74 USGS(M)-RWT-59-72B "4.962E-04, 0.581E-04, 1.1167E-04" 1.109 1.0358 42 "1.110%, 1.108% K2O" AGE IS PRBABLY A COMBINATION OF PROVENANCE ROCK AGE AND METAMORPHIC AGE 4508 1 26.9 0.5 whole rock conventional K-Ar 75 USGS(M)-OC-149BA "4.962E-04, 0.581E-04, 1.1167E-04" 1.5285 0.5965 51 age of metamorphic crystallization -60 +100 MESH FRACTION "1.530%, 1.527% K2O" CONSULT TABOR (1972) FOR MORE INFORMATION. 4508 2 30.1 0.6 whole rock conventional K-Ar 75 USGS(M)-OC-149BB "4.962E-04, 0.581E-04, 1.1167E-04" 1.336 0.5844 53 age of metamorphic crystallization "1.337%, 1.335% K2O" 4509 1 18.2 1.2 whole rock conventional K-Ar 76 USGS(M)-RWT-70-72A "4.962E-04, 0.581E-04, 1.1167E-04" 2.76 0.7269 65 age of metamorphic crystallization -60 +100 MESH FRACTION 4509 2 16.6 1.1 whole rock conventional K-Ar 76 USGS(M)-RWT-70-72B "4.962E-04, 0.581E-04, 1.1167E-04" 2.74 0.6564 63 age of metamorphic crystallization -100 MESH FRACTION 4510 1 18.7 1.3 whole rock conventional K-Ar 77 USGS(M)-RWT-285-71A "4.962E-04, 0.581E-04, 1.1167E-04" 3.33 0.9008 68 age of metamorphic crystallization -100 MESH FRACTION 4510 2 20.3 1.4 whole rock conventional K-Ar 77 USGS(M)-RWT-285-71B "4.962E-04, 0.581E-04, 1.1167E-04" 3.195 0.9397 76 age of metamorphic crystallization -60 +100 MESH FRACTION 4511 1 82.3 3.6 hornblende conventional K-Ar 78 USGS(M)-RWT-151-76 "4.962E-04, 0.581E-04, 1.1167E-04" 0.303 0.3674 5256 age of intrusion -150 +200 MESH FRACTION "0.305%, 0.297%, 0.312%, AND 0.298% K2O; AR-40 = 0.3534 AND 0.3814 E-10 MOL/GM" "THE FORTUNE CREEK STOCK IS PROBABLY CRETACEOUS IN AGE; IT INTRUDES THE INGALLS ULTRAMAFIC COMPLEX AND MAY BE A SATELLITE TO THE MT. STUART BATHOLITH SUGGESTING THAT THE BATHOLITH IS ALSO CRETACEOUS IN AGE. IT IS NOW CONSIDERED TO BE EOCENE IN AGE BASED ON A K-AR PLAGIOCLASE AGE OF 50 M.Y. (LAURSEN AND HAMMOND, 1974, P. 18)." 4512 1 42.5 2.6 hornblende conventional K-Ar 79 USGS(M)-75-207 "4.962E-04, 0.581E-04, 1.1167E-04" 0.586 0.3629 205658 age of intrusion "0.585%, 0.585%, 0.586%, AND 0.589% K2O; AR-40 = 0.3817, 0.3645, AND 0.3424 E-10 MOL/GM" "DIKE INTRUDES SANDSTONES (SWANK GROUP) WHICH ARE ABOUT 44 M.Y. OLD BY THE FISSION-TRACK DATING METHOD (WHETTEN, 1976)." 4551 1 205.88 12 whole rock conventional K-Ar 1-A "4.72E-04, 0.584E-04, 1.19E-04*" 0.93 2.92 71 age of volcanism "0.78%, 0.77% K" 4552 1 164.16 9 whole rock conventional K-Ar 1-B "4.72E-04, 0.584E-04, 1.19E-04*" 0.97 2.4 88 "0.82%, 0.79% K" AGE IS TOO LOW 4553 1 203.19 12 whole rock conventional K-Ar 1-C "4.72E-04, 0.584E-04, 1.19E-04*" 0.83 2.57 62 age of volcanism "0.68%, 0.70% K" 4554 1 180.98 11 whole rock conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.54 1.48 32 minimum age of volcanism "0.44%, 0.46% K" 4555 1 198.92 12 whole rock conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 1.08 3.27 61 age of metamorphic crystallization "0.89%, 0.90% K" 4556 1 12.1 plagioclase conventional K-Ar KA 1292 "4.72E-04, 0.585E-04, 1.19E-04" 0.151 22 age of volcanism "0.125% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4557 1 34 plagioclase conventional K-Ar KA 1204 "4.72E-04, 0.585E-04, 1.19E-04" 0.631 65 age of volcanism "0.524% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4558 1 32 sanidine conventional K-Ar KA 1384 "4.72E-04, 0.585E-04, 1.19E-04" 7.645 82 age of volcanism "6.344% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4559 1 31 plagioclase conventional K-Ar KA 1282 "4.72E-04, 0.585E-04, 1.19E-04" 0.245 57 age of volcanism "0.203% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4560 1 4.3 plagioclase conventional K-Ar KA 1223 "4.72E-04, 0.585E-04, 1.19E-04" 0.222 58 age of volcanism "0.184% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4560 2 5.3 plagioclase conventional K-Ar KA 1280 "4.72E-04, 0.585E-04, 1.19E-04" 0.245 11 age of volcanism "0.203% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4561 1 16.7 plagioclase conventional K-Ar KA 1285 "4.72E-04, 0.585E-04, 1.19E-04" 0.258 27 age of volcanism "0.214% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4562 1 19.9 sanidine conventional K-Ar KA-1168 "4.72E-04, 0.585E-04, 1.19E-04" 10.72 77 age of volcanism "8.90% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4563 1 10 biotite conventional K-Ar KA 453 "4.72E-04, 0.585E-04, 1.19E-04" 7.9 29 age of volcanism "6.56% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4564 1 12.6 biotite conventional K-Ar KA 1246 "4.72E-04, 0.585E-04, 1.19E-04" 8.44 77 age of volcanism "7.006% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4564 2 13 plagioclase conventional K-Ar KA 1248 "4.72E-04, 0.585E-04, 1.19E-04" 0.899 67 age of volcanism "0.746% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4565 1 32.3 plagioclase conventional K-Ar KA 1133 "4.72E-04, 0.585E-04, 1.19E-04" 0.486 68 age of volcanism "0.403% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4566 1 3.2 whole rock conventional K-Ar KA 1013 "4.72E-04, 0.585E-04, 1.19E-04" 4.06 72 age of volcanism "3.37% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4567 1 3.4 plagioclase conventional K-Ar KA 1281R "4.72E-04, 0.585E-04, 1.19E-04" 0.462 24 age of volcanism "0.383% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4568 1 33.2 biotite conventional K-Ar KA 837 "4.72E-04, 0.585E-04, 1.19E-04" 7.17 43 age of volcanism "5.95% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4569 1 14.5 whole rock conventional K-Ar KA 1236 "4.72E-04, 0.585E-04, 1.19E-04" 1.399 49 age of volcanism CRUSHED AND LEACHED IN HF "1.161% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4570 1 12.1 whole rock conventional K-Ar KA 1240 "4.72E-04, 0.585E-04, 1.19E-04" 1.289 40 age of volcanism CRUSHED AND LEACHED WITH HF "1.070% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4571 1 21.3 whole rock conventional K-Ar KA 1230 "4.72E-04, 0.585E-04, 1.19E-04" 2.149 69 age of volcanism CRUSHED AND LEACHED WITH HF; SLIGHT ALTERATION IN THE PLAGIOCLASES "1.738% K, ARGON CONTENT AND ANALYTICAL ERROR ARE NOT GIVEN" 4572 1 30.27 2.5 biotite conventional K-Ar 63T1043 "4.72E-04, 0.585E-04, 1.19E-04*" 8.91 3.916 72 age of intrusion "AGE LISTED AS 30 M.Y. BY SILBERMAN AND MCKEE (1971). ANALYTICAL DATA RELEASED BY D.B. TATLOCK, USGS" 4573 1 38 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4574 1 190 6 hornblende conventional K-Ar (NOT GIVEN) no decay constants given minimum age of metamorphic crystallization SYNKINEMATIC HORNBLENDE NO ANALYTICAL DATA GIVEN 4575 1 14.6 1.5 sanidine conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 4576 1 37 2 hornblende conventional K-Ar (NOT GIVEN) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 4576 2 13 1 biotite conventional K-Ar (NOT GIVEN) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 4577 1 80 3 hornblende conventional K-Ar (NOT GIVEN) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 4578 1 219 7 hornblende conventional K-Ar (NOT GIVEN) no decay constants given minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 4579 1 204.26 6 whole rock conventional K-Ar 4(A) "4.72E-04, 0.584E-04, 1.19E-04*" 0.44 1.37 73676254 age of intrusion "0.37%, 0.35%, 0.37%, 0.36% K; 3.07 X E-6, 3.09 X E-6, 3.21 X E-6, 2.92 X E-6 RAD AR-40" 4580 1 201.49 12 whole rock conventional K-Ar 4(B) "4.72E-04, 0.584E-04, 1.19E-04*" 0.58 1.78 60 age of intrusion "0.49%, 0.47% K" 4581 1 195.78 12 whole rock conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.44 1.31 54 minimum age of intrusion "0.36%, 0.37% K" 4582 1 203.29 12 whole rock conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 0.51 1.58 47 age of intrusion "0.43%, 0.42% K" 4583 1 184.34 10 whole rock conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 2.09 5.84 92 minimum age of intrusion "1.72%, 1.75% K" 4584 1 155.28 9 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 2.57 6 67 minimum age of intrusion "2.13%, 2.14% K" AGE MAY BE TOO YOUNG 4585 1 197.2 12 whole rock conventional K-Ar 9(A) "4.72E-04, 0.584E-04, 1.19E-04*" 0.48 1.44 42 age of intrusion "0.40%, 0.40% K" 4586 1 198.49 12 whole rock conventional K-Ar 9(B) "4.72E-04, 0.584E-04, 1.19E-04*" 0.48 1.45 40 age of intrusion "0.41%, 0.39% K" 4587 1 228.78 10 whole rock conventional K-Ar 10(A) "4.72E-04, 0.584E-04, 1.19E-04*" 0.43 1.51 4352 age of intrusion "0.35%, 0.37% K; 3.50XE-6, 3.28XE-6 STP CC RAD AR-40" 4588 1 230.98 13 whole rock conventional K-Ar 10(B) "4.72E-04, 0.584E-04, 1.19E-04*" 0.42 1.49 31 age of intrusion "0.35%, 0.35% K" 4589 1 200.75 12 whole rock conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 0.35 1.07 63 age of intrusion "0.29%, 0.29% K" 4590 1 210.12 12 whole rock conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 0.48 1.54 68 age of intrusion "0.39%, 0.41% K" 4591 1 218.3 9 whole rock conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 0.44 1.47 6658 age of intrusion "0.37%, 0.36% K; 3.42XE-6, 3.16XE-6 STP CC RAD AR-40" 4592 1 167.34 10 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.265 0.669 1719 age not evaluated "0.23%, 0.21% K; 1.46XE-6, 1.54XE-6 STP CC RAD AR-40" 4593 1 196.66 2 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 8.19 24.5 928195 age of intrusion "6.82%, 6.81%, 6.72%, 6.86% K; 54.5XE-6, 54.9XE-6, 55.4XE-6 STP CC RAD AR-40" 4594 1 232.62 10 whole rock conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.19E-04*" 0.47 1.68 5954 age of intrusion 1% CLAY AND CHLORITE "0.40%, 0.38% K; 3.75XE-6, 3.76XE-6 STP CC RAD AR-40" 4594 2 228.69 13 whole rock conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.19E-04*" 0.49 1.72 70 age of intrusion 1% CLAY AND CHLORITE "0.41%, 0.41% K" 4595 1 242.15 14 whole rock conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04*" 0.119 0.444 1816 age of intrusion "0.099%, 0.099% K; 1.01XE-6, 0.98XE-6 STP CC RAD AR-40" 4596 1 250.8 15 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 0.111 0.43 18 "sample contains excess radiogenic argon, age is too old" "1% CLAY, CHLORITE" "0.091%, 0.093% K" DIKE CUTS TRIASSIC AGE ROCKS 4597 1 184.74 4 biotite conventional K-Ar YAG-979 "4.72E-04, 0.584E-04, 1.19E-04*" 2.96 8.29 878585 minimum age of intrusion "40% CHLORITE, 4% QUARTZ, FLEDSPAR" "2.46%, 2.45% K; 19.18XE-6, 18.35XE-6, 18.23XE-6 STP CC RAD AR-40" 4597 2 205.81 8 hornblende conventional K-Ar YAG-979 "4.72E-04, 0.584E-04, 1.19E-04*" 0.31 0.973 5655 age of intrusion "18% CHLORITE, 2% QUARTZ, FELDSPAR" "0.258%, 0.257% K; 2.17XE-6, 2.19XE-6 STP CC RAD AR-40" 4598 1 203.52 4 biotite conventional K-Ar YAG-984 "4.72E-04, 0.584E-04, 1.19E-04*" 3.54 10.98 74 age of intrusion "35% CHLORITE, 10% HORNBLENDE" "2.93%, 2.94% K" "A BIOTITE K-AR DATE OF 216+/-5 M.Y. WAS DETERMINED FOR THIS PLUTON BY ISOTOPES INC. (C.W. FIELD, PERSONAL COMMUNICATION, 1967)" 4598 2 222.31 8 hornblende conventional K-Ar YAG-984 "4.72E-04, 0.584E-04, 1.19E-04*" 0.458 1.56 6361 age of intrusion "3% CHLORITE, 1% BIOTITE" "0.366%, 0.373%, 0.388% 0.393% K; 3.52XE-6, 3.46XE-6 STP CC RAD AR-40" 4599 1 439 9 muscovite 39Ar-40Ar incremental (plateau) LA-384A "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization COARSE MUSCOVITE 40-39AR PLATEAU AGE 4599 2 441 3.2 muscovite 40Ar/36Ar-40K/36Ar isochron LA-384A "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization COARSE MUSCOVITE 9-POINT ISOCHRON AGE ON 40-36AR VERSUS 39-36AR PLOT 4599 3 358 4 muscovite 39Ar-40Ar incremental (plateau) LA-384B "4.72E-04, 0.585E-04, 1.19E-04" RETROGRADE MUSCOVITE 40-39AR PLATEAU AGE; TOTAL FUSION AGE IS 354 M.Y. AGE OF LATER METAMORPHISM 4599 4 371 5.5 muscovite 40Ar/36Ar-40K/36Ar isochron LA-384B "4.72E-04, 0.585E-04, 1.19E-04" RETROGRADE MUSCOVITE 4-POINT ISOCHRON AGE ON 40-36AR VERSUS 39-36AR PLOT AGE OF LATER METAMORPHISM 4600 1 457 26 hornblende 39Ar-40Ar total fusion LA-385 "4.72E-04, 0.585E-04, 1.19E-04" 34 age of metamorphic crystallization 40-39AR TOTAL FUSION AGE 4612 1 94.8 4.2 whole rock conventional K-Ar B-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.8968 83 "THE BEST AGE FOR THIS BASALT IS 184 M.Y. (LAMPHERE, 1983)" 4613 1 98.66 2 phlogopite conventional K-Ar AK-1 "4.72E-04, 0.585E-04, 1.19E-04*" 5.74 8.38 89 age of intrusion 4614 1 108.3 3 phlogopite conventional K-Ar AK-8 "4.72E-04, 0.585E-04, 1.19E-04*" 9.82 15.78 95 age of volcanism 4615 1 378.86 14 riebeckite conventional K-Ar A-1089 "4.72E-04, 0.585E-04, 1.19E-04*" 1.641 9.96 72 "FRESH RIEBECKITE CONCENTRATE, -20+100 MESH; TRACES OF QUARTZ" "1.351%, 1.373% K" AVERAGED RIEBECKITE AGES IS 366 M.Y. 4616 1 383.38 14 riebeckite conventional K-Ar A-1090 "4.72E-04, 0.585E-04, 1.19E-04*" 1.696 10.43 79 maximum age of intrusion "FRESH RIEBECKITE CONCENTRATE, -40+100 MESH; TRACES OF QUARTZ AND FELDSPAR" "1.409%, 1.406% K" 4617 1 359.61 11 riebeckite conventional K-Ar A-1091 "4.72E-04, 0.585E-04, 1.19E-04*" 1.419 8.13 7176 "FRESH RIEBECKITE CONCENTRATE, -40+200 MESH; 1% BIOTITE, 1% FELDSPAR" "1.206%, 1.150% K; 0.0325 PPM, 0.0325 PPM RAD AR-40" AVERAGED RIEBECKITE AGES IS 366 M.Y. 4618 1 315.8 10 biotite conventional K-Ar B-1092 "4.72E-04, 0.585E-04, 1.19E-04*" 6.396 31.78 80 "-40+100 MESH; SLIGHTLY CHLORITIZED BIOTITE, 1% QUARTZ AND 1% FELDSPAR" AGE APPEARS TOO YOUNG 4619 1 370.65 15 riebeckite conventional K-Ar A-2009 "4.72E-04, 0.585E-04, 1.19E-04*" 1.58 9.36 76 "-60+200 MESH; 96% RIEBECKITE, 4% QUARTZ AND FELDSPAR" AVERAGED RIEBECKITE AGES IS 366 M.Y. 4620 1 378.17 16 riebeckite conventional K-Ar A-2010 "4.72E-04, 0.585E-04, 1.19E-04*" 1.4 8.48 61 "-100+200 MESH; 95% RIEBECKITE, 5% QUARTZ AND FELDSPAR" AVERAGED RIEBECKITE AGES IS 366 M.Y. 4621 1 234.83 11 whole rock conventional K-Ar B-3042 "4.72E-04, 0.585E-04, 1.19E-04*" 4.589 16.57 60 -80+200 MESH "3.813%, 3.804% K" APPROX. AGE OF 342 M.Y. OBTAINED WHEN CORRECTED FOR ASSUMED ARGON LOSS OF 35% 4622 1 260.59 14 biotite conventional K-Ar B-3043 "4.72E-04, 0.585E-04, 1.19E-04*" 1.187 4.791 35 -80+200 MESH; 99% PARTLY CHLORITIZED BIOTITE WITH TRACES OF QUARTZ AND FELDSPAR "0.977%, 0.993% K" AGE APPEARS TOO YOUNG 4623 1 350.61 14 riebeckite conventional K-Ar A-3044 "4.72E-04, 0.585E-04, 1.19E-04*" 0.733 4.084 4650 "-80+200 MESH; 98% PARTLY ALTERED RIEBECKITE, 2% QUARTZ AND FELDSPAR" "0.609%, 0.607% K; 0.01644 PPM, 0.01621 PPM RAD AR-40" AGE PROBABLY REDUCED BY ALTERATION 4624 1 241.01 12 riebeckite conventional K-Ar A-2031 "4.72E-04, 0.585E-04, 1.19E-04*" 0.563 2.09 53 initial age disturbed by later metamorphism "-40+200 MESH; 95% RIEBECKITE, 5% AEGIRINE AND EPIDOTE, TRACE OF QUARTZ" 4625 1 230.72 12 riebeckite conventional K-Ar A-2032 "4.72E-04, 0.585E-04, 1.19E-04*" 0.587 2.08 52 initial age disturbed by later metamorphism "-40+200 MESH; 96% RIEBECKITE, 2% QUARTZ, 2% IRON OXIDES" 4626 1 192.48 9 riebeckite conventional K-Ar A-2033 "4.72E-04, 0.585E-04, 1.19E-04*" 0.992 2.901 585854 initial age disturbed by later metamorphism "-40+200 MESH; 98% RIEBECKITE, 2% QUARTZ AND FELDSPAR" "0.01111 PPM, 0.01214 PPM, 0.01153 PPM RAD AR-40" 4627 1 1024.5 50 aegerine (acmite) conventional K-Ar P-0066 "4.72E-04, 0.585E-04, 1.19E-04*" 0.07 1.39 30 AEGIRINE CONCENTRATE WITH TRACES OF FELDSPAR AND QUARTZ; -60+200 MESH "0.058%, 0.059% K" AGE IS TOO OLD 4629 1 300 biotite conventional K-Ar B3173 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40AR/40K = 0.0191 4631 1 235 biotite conventional K-Ar B3177 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40AR/40K = 0.0147 4633 1 232 biotite conventional K-Ar B3376A "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40AR/40K = 0.0144 4634 1 193 6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4635 1 191 6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 4667 1 467.76 9 whole rock conventional K-Ar 28 "4.72E-04, 0.584E-04, 1.19E-04*" 4.07 31.29 98 age of metamorphic crystallization -45+70 MESH 4668 1 453.56 9 whole rock conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04*" 4.08 30.29 97 age of metamorphic crystallization -45+70 MESH 4669 1 426.89 8 whole rock conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 3.94 27.32 95 age of later metamorphism MESH SIZE -45+70 TIME OF INITIAL FORMATION OF THE SLATE APPROX. 450 M.Y. 4670 1 421.61 8 whole rock conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04*" 3.76 25.71 96 age of later metamorphism MESH SIZE -45+70 TIME OF INITIAL FORMATION OF THE SLATE APPROX. 450 M.Y. 4671 1 394.09 8 whole rock conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04*" 2.58 16.36 94 age of later metamorphism -45+70 MESH TIME OF INITIAL FORMATION OF THE SLATE APPROX. 450 M.Y. 4672 1 381.36 8 whole rock conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 4.83 29.53 94 age of later metamorphism -45+70 MESH SIZE TIME OF INITIAL FORMATION OF THE SLATE APPROX. 450 M.Y. 4673 1 445.79 9 muscovite conventional K-Ar 48 "4.72E-04, 0.584E-04, 1.19E-04*" 9.98 72.66 97 age of uplift and cooling 4674 1 430.06 8 muscovite conventional K-Ar 52 "4.72E-04, 0.584E-04, 1.19E-04*" 9.86 68.94 98 age of uplift and cooling 4675 1 413.79 8 muscovite conventional K-Ar 44 "4.72E-04, 0.584E-04, 1.19E-04*" 9.37 62.74 98 age of uplift and cooling 4676 1 411.54 8 muscovite conventional K-Ar 41 "4.72E-04, 0.584E-04, 1.19E-04*" 9.6 63.89 98 age of uplift and cooling 4677 1 401.55 8 muscovite conventional K-Ar 45 "4.72E-04, 0.584E-04, 1.19E-04*" 9.77 63.26 98 age of uplift and cooling 4678 1 399.48 8 muscovite conventional K-Ar 38 "4.72E-04, 0.584E-04, 1.19E-04*" 9.39 60.45 98 age of uplift and cooling 4679 1 397.74 8 muscovite conventional K-Ar 42 "4.72E-04, 0.584E-04, 1.19E-04*" 8.98 57.53 99 age of uplift and cooling 4679 2 380.17 7 biotite conventional K-Ar 42 "4.72E-04, 0.584E-04, 1.19E-04*" 7.23 44.05 96 age of uplift and cooling 4680 1 390.81 8 muscovite conventional K-Ar 51 "4.72E-04, 0.584E-04, 1.19E-04*" 8.96 56.29 96 age of uplift and cooling 4681 1 390.04 8 muscovite conventional K-Ar 31 "4.72E-04, 0.584E-04, 1.19E-04*" 9.75 61.12 97 age of uplift and cooling 4681 2 386.6 8 muscovite conventional K-Ar 31 "4.72E-04, 0.584E-04, 1.19E-04*" 9.75 60.52 98 age of uplift and cooling 4681 3 387.77 8 biotite conventional K-Ar 31 "4.72E-04, 0.584E-04, 1.19E-04*" 8.59 53.5 97 age of uplift and cooling 4682 1 386.81 8 muscovite conventional K-Ar 46 "4.72E-04, 0.584E-04, 1.19E-04*" 10.1 62.73 98 age of uplift and cooling 4683 1 867.79 17 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 9.53 152.9 98 initial age disturbed by later metamorphism PROBABLE LOSS OF RAD. AR DUE TO PALEOZOIC TECTOGENESIS 4684 1 615.52 12 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04*" 8.11 85.65 97 initial age disturbed by later metamorphism PROBABLE LOSS OF RAD. AR DUE TO PALEOZOIC TECTOGENESIS 4685 1 368.63 7 whole rock conventional K-Ar 54 "4.72E-04, 0.584E-04, 1.19E-04*" 2.06 12.13 95 "minimum age of metamorphic crystallization, age of uplift and cooling" -45+70 MESH 4686 1 358.4 7 whole rock conventional K-Ar 35 "4.72E-04, 0.584E-04, 1.19E-04*" 4.35 24.83 98 "age of metamorphic crystallization, age of uplift and cooling" -45+70 MESH 4687 1 347.61 7 whole rock conventional K-Ar 34 "4.72E-04, 0.584E-04, 1.19E-04*" 4.68 25.83 99 "age of metamorphic crystallization, age of uplift and cooling" -45+70 MESH 4688 1 343.93 7 whole rock conventional K-Ar 33 "4.72E-04, 0.584E-04, 1.19E-04*" 4 21.82 97 "age of metamorphic crystallization, age of uplift and cooling" -45+70 MESH 4689 1 352.26 7 muscovite conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.19E-04*" 9.01 50.46 97 age of uplift and cooling 4689 2 350.28 7 biotite conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.19E-04*" 7.83 43.58 96 age of uplift and cooling 4690 1 348.6 7 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 8.65 47.89 96 age of uplift and cooling 4690 2 340.46 7 muscovite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 9.25 49.9 95 age of uplift and cooling 4690 3 330.79 7 muscovite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 9.25 48.35 97 age of uplift and cooling 4691 1 354.37 7 muscovite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 9.21 51.92 95 age of uplift and cooling 4691 2 323.93 6 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.75 44.7 96 age of uplift and cooling 4692 1 353.71 7 muscovite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 10.37 58.34 96 age of uplift and cooling 4692 2 331.65 7 biotite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 9.39 49.22 96 age of uplift and cooling 4693 1 93.7 5 biotite conventional K-Ar 556B "4.72E-04, 0.585E-04, 1.19E-04*" 8.06 11.16 97 age of intrusion MESH SIZE -10+20 4694 1 92.25 5 biotite conventional K-Ar 557B "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 11.61 95 age of intrusion MESH SIZE -40+80 4695 1 90 4 biotite conventional K-Ar 703B "4.72E-04, 0.585E-04, 1.19E-04*" 7.85 10.43 83 age of intrusion MESH SIZE -80+120 4696 1 89.14 4 biotite conventional K-Ar 249B "4.72E-04, 0.585E-04, 1.19E-04*" 9.03 11.88 90 age of intrusion MESH SIZE -20+40 "THIS AGE USED BY MISER AND MILTON, 1964, P. 16, FOR PUBLISHED AGE OF 89 M.Y. (AVERAGE OF 2 AGES)" 4697 1 93.93 5 biotite conventional K-Ar 250B "4.72E-04, 0.585E-04, 1.19E-04*" 8.81 12.23 90 age of intrusion MESH SIZE -20+40 "THIS AGE USED BY MISER AND MILTON, 1964, P. 16, FOR PUBLISHED AGE OF 89 M.Y. (AVERAGE OF 2 AGES)" 4698 1 97.48 5 biotite conventional K-Ar 558B "4.72E-04, 0.585E-04, 1.19E-04*" 9.91 14.29 91 age of intrusion MESH SIZE -10+20 4699 1 99.77 5 biotite conventional K-Ar 562B "4.72E-04, 0.585E-04, 1.19E-04*" 9.08 13.41 95 age of intrusion MESH SIZE -40+80 4700 1 385.05 19 biotite conventional K-Ar 192B "4.72E-04, 0.585E-04, 1.19E-04*" 9.19 56.79 95 age of intrusion MESH SIZE -10+20 4701 1 396.51 19 biotite conventional K-Ar 194B "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 55.29 96 age of intrusion MESH SIZE -10+20 4702 1 265.52 13 biotite conventional K-Ar 189B "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 36.53 96 age of intrusion MESH SIZE -10+20 4702 2 287.98 14 hornblende conventional K-Ar 189H "4.72E-04, 0.585E-04, 1.19E-04*" 2.12 9.53 97 maximum age of intrusion MESH SIZE -20+40 4703 1 275.2 13 biotite conventional K-Ar 238B "4.72E-04, 0.585E-04, 1.19E-04*" 8.71 37.28 97 age of intrusion MESH SIZE -40+80 4704 1 258.27 13 biotite conventional K-Ar 197B "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 34.78 94 age of intrusion MESH SIZE -40+80 4705 1 286.32 14 biotite conventional K-Ar 555B(A) "4.72E-04, 0.585E-04, 1.19E-04*" 6.72 30.02 94 age of intrusion MESH SIZE -10+20 4705 2 276.21 14 biotite conventional K-Ar 555B(B) "4.72E-04, 0.585E-04, 1.19E-04*" 5.35 22.99 89 age of intrusion MESH SIZE -20+40 4706 1 148.28 7 biotite conventional K-Ar 563B "4.72E-04, 0.585E-04, 1.19E-04*" 7.6 16.91 91 age of intrusion MESH SIZE -40+80 4706 2 156.8 8 hornblende conventional K-Ar 563H "4.72E-04, 0.585E-04, 1.19E-04*" 2.26 5.33 95 age of intrusion MESH SIZE -40+80 4707 1 446.32 22 biotite conventional K-Ar 260B "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 64.3 98 age of intrusion MESH SIZE -20+40 4708 1 446.63 22 biotite conventional K-Ar 261B "4.72E-04, 0.585E-04, 1.19E-04*" 9.19 67.05 98 age of intrusion MESH SIZE -40+80 4709 1 139.34 7 biotite conventional K-Ar 514B "4.72E-04, 0.585E-04, 1.19E-04*" 7.94 16.56 92 age of intrusion MESH SIZE -40+80 4710 1 376.38 18 biotite conventional K-Ar 259B "4.72E-04, 0.585E-04, 1.19E-04*" 9.84 59.29 97 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20; PROBABLY XENOCRYSTIC BIOTITE 4710 2 416.12 20 biotite conventional K-Ar 259B "4.72E-04, 0.585E-04, 1.19E-04*" 9.84 66.303 86 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20; PROBABLY XENOCRYSTIC BIOTITE 4711 1 448.07 22 biotite conventional K-Ar 190B(A) "4.72E-04, 0.585E-04, 1.19E-04*" 9.02 66.05 95 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4712 1 503.69 25 biotite conventional K-Ar 190B(B) "4.72E-04, 0.585E-04, 1.19E-04*" 10.05 84.07 94 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4713 1 429.09 21 biotite conventional K-Ar 190B(C) "4.72E-04, 0.585E-04, 1.19E-04*" 9.65 67.3 96 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4713 2 427.67 21 biotite conventional K-Ar 190B(C) "4.72E-04, 0.585E-04, 1.19E-04*" 9.65 67.05 96 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4714 1 148.48 7 biotite conventional K-Ar 190B(D) "4.72E-04, 0.585E-04, 1.19E-04*" 7.32 16.31 96 "sample contains excess radiogenic argon, age is too old" MESH SIZE (-80+120); BIOTITE MAY OR MAY NOT BE XENOCRYSTIC 4715 1 378.62 19 biotite conventional K-Ar 193B(A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 52.04 93 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4715 2 265.13 13 biotite conventional K-Ar 193B(A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 35.28 96 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4715 3 261.57 13 biotite conventional K-Ar 193B(A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 34.77 91 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4716 1 340.67 17 biotite conventional K-Ar 193B(B) "4.72E-04, 0.585E-04, 1.19E-04*" 9.64 52.04 96 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4716 2 312.05 15 biotite conventional K-Ar 193B(B) "4.72E-04, 0.585E-04, 1.19E-04*" 9.64 47.28 95 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4716 3 327.14 16 biotite conventional K-Ar 193B(B) "4.72E-04, 0.585E-04, 1.19E-04*" 9.64 49.78 93 "sample contains excess radiogenic argon, age is too old" MESH SIZE -10+20 4717 1 154.03 8 biotite conventional K-Ar 193B(C) "4.72E-04, 0.585E-04, 1.19E-04*" 7.08 16.39 94 age of intrusion MESH SIZE -80+120; BIOTITE IS PROBABLY NOT XENOCRYSTIC 4831 1 174.86 4 biotite conventional K-Ar NH-74-30 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 23.315 9089 age of intrusion REPLICATE AR ANALYSES 4832 1 171.66 3 biotite conventional K-Ar QNH61-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.9 17.89 86 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4833 1 167.33 4 biotite conventional K-Ar NH-74-31 "4.72E-04, 0.585E-04, 1.19E-04*" 7.61 19.21 9192 age of intrusion REPLICATE AR ANALYSES 4834 1 185.6 4 biotite conventional K-Ar QNH61-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.54 21.22 95 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4835 1 192.48 5 amphiboles conventional K-Ar NH-75-45 "4.72E-04, 0.585E-04, 1.19E-04*" 3.11 9.095 8384 age of intrusion AMPHIBOLE WITH 20% MICA REPLICATE AR ANALYSES 4836 1 198.11 4 biotite conventional K-Ar QNH61-3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 24.69 92 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4837 1 174.33 4 biotite conventional K-Ar NH-75-41 "4.72E-04, 0.585E-04, 1.19E-04*" 9.33 24.585 6094 age of intrusion REPLICATE AR ANALYSES 4838 1 183.6 4 biotite conventional K-Ar NH-75-40 "4.72E-04, 0.585E-04, 1.19E-04*" 7.93 22.065 9290 age of intrusion REPLICATE AR ANALYSES 4839 1 179.09 5 biotite conventional K-Ar NH-74-21 "4.72E-04, 0.585E-04, 1.19E-04*" 6.22 16.86 91 age of intrusion 4840 1 184.23 4 biotite conventional K-Ar QNH61-22 "4.72E-04, 0.585E-04, 1.19E-04*" 7.18 20.05 91 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4841 1 114.99 3 biotite conventional K-Ar ME/F1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 15.18 89 age of intrusion 4842 1 110.93 2 biotite conventional K-Ar ME/KF2-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 13.82 8767 age of intrusion REPLICATE AR ANALYSES 4843 1 188.34 4 biotite conventional K-Ar NH-74-28 "4.72E-04, 0.585E-04, 1.19E-04*" 6.31 18.035 9184 age of intrusion REPLICATE AR ANALYSES 4844 1 112.28 3 biotite conventional K-Ar NH-75-2 "4.72E-04, 0.585E-04, 1.19E-04*" 5.84 9.74 72 age of intrusion 4845 1 124.14 2 biotite conventional K-Ar BG-8-68 "4.72E-04, 0.585E-04, 1.19E-04*" 8.28 15.32 86 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4846 1 197.92 4 biotite conventional K-Ar NH-74-9 "4.72E-04, 0.585E-04, 1.19E-04*" 9.4 28.31 9492 age of intrusion REPLICATE AR ANALYSES 4847 1 226 8 amphiboles conventional K-Ar ME/N1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.301 1.045 76 age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION; REPLICATE AR ANALYSES 4848 1 120.17 2 biotite conventional K-Ar QNH61-16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.15 14.58 727689 Foland and others (1971) age of intrusion TRIPLICATE AR ANALYSES "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4849 1 162.26 3 biotite conventional K-Ar QNH61-20 "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 21.95 9493 age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION; REPLICATE AR ANALYSES 4850 1 160.58 3 biotite conventional K-Ar BG-7-68 "4.72E-04, 0.585E-04, 1.19E-04*" 7.8 18.86 86 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4851 1 159.21 3 biotite NH-75-1 "4.72E-04, 0.585E-04, 1.19E-04*" 5.35 12.82 74 age of intrusion 4852 1 122.68 2 biotite conventional K-Ar ME 54 "4.72E-04, 0.585E-04, 1.19E-04*" 8.59 15.7 83 age of intrusion 4853 1 123.22 2 biotite conventional K-Ar VT-33 "4.72E-04, 0.585E-04, 1.19E-04*" 8.78 16.12 9088 age of intrusion REPLICATE AR ANALYSES 4854 1 121.41 2 biotite conventional K-Ar VT-75-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.25 16.725 7788 age of intrusion REPLICATE AR ANALYSES 4855 1 122.39 2 biotite conventional K-Ar QNH61-25 "4.72E-04, 0.585E-04, 1.19E-04*" 8.71 15.88 908589 Foland and others (1971) age of intrusion "REPLICATE K ANALYSES, TRIPLICATE AR ANALYSES" "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4856 1 123.11 4 biotite conventional K-Ar VT-32 "4.72E-04, 0.585E-04, 1.19E-04*" 6.7 12.29 7875 age of intrusion REPLICATE AR ANALYSES 4857 1 126.98 3 biotite conventional K-Ar VT-3 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 17.16 918981 age of intrusion REPLICATE K ANALYSES; TRIPLICATE AR ANALYSES INCLUSED REVISED DATA FROM FAUL AND OTHERS (1963) 4858 1 124.34 3 biotite conventional K-Ar VT-75-8 "4.72E-04, 0.585E-04, 1.19E-04*" 9.1 16.865 8792 age of intrusion REPLICATE AR ANALYSES 4859 1 127.67 3 biotite conventional K-Ar ME-74-4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.03 15.295 6079 age of intrusion REPLICATE AR ANALYSES 4860 1 124.57 2 biotite conventional K-Ar ME 55B "4.72E-04, 0.585E-04, 1.19E-04*" 6.137 11.395 8990 age of intrusion K CONTENT DETERMINED BY ISOTOPE DILUTION; REPLICATE AR ANALYSES 4861 1 232.16 5 biotite conventional K-Ar BG-10-68 "4.72E-04, 0.585E-04, 1.19E-04*" 7.83 27.93 84 Foland and others (1971) age of intrusion "REVISED DATA FROM FOLAND, QUINN, AND GILETTI (1971)" 4862 1 118.41 2 biotite conventional K-Ar CNG-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.61 15.17 83 age of intrusion K CONTENT DETERMINED BY ISOTOPE DILUTION 4863 1 114.07 3 biotite conventional K-Ar NH-74-2 "4.72E-04, 0.585E-04, 1.19E-04*" 5.48 9.29 82 age of intrusion 4908 1 357 10 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 4968 1 79.23 1.9 muscovite conventional K-Ar DRS-122-67 "4.72E-04, 0.585E-04, 1.19E-04*" 10.9 12.71 88 age of intrusion "10.89, 10.92%K2O" 4969 1 78.4 2.2 muscovite conventional K-Ar M25-5 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion ANALYTICAL DATA NOT GIVEN "THE AGE FOR THIS SAMPLE WAS REPORTED AS 78.2 +/- 1.6 M.Y. BY SILBERMAN AND MCKEE, 1971, ISOCHRON/WEST, NO.1, P.30; THEY PUBLISHED THE ANALYTICAL DATA" 4970 1 78 2.5 muscovite conventional K-Ar M25-5 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion ANALYTICAL DATA NOT GIVEN "THE AGE FOR THIS SAMPLE WAS REPORTED AS 78.2 +/- 1.6 M.Y. BY SILBERMAN AND MCKEE, 1971, ISOCHRON/WEST, NO.1, P.30; THEY PUBLISHED THE ANALYTICAL DATA." 4971 1 18.2 1.5 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.082 0.2852 13 age of volcanism "AN AGE OF 17.6 M.Y. WAS REPORTED FOR THIS SAMPLE BY YOUNG, BRENNAN, LUCCHITTA, AND MCKEE(1975)--AN ABSTRACT; AGE HAS BEEN RECALCULATED WITH REVISED DECAY CONSTANTS FOR K-40." 4972 1 24.7 3.5 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.488 0.1748 11 age of volcanism 4973 1 1.7 0.8 feldspar conventional K-Ar BCB-NYM "4.72E-04, 0.585E-04, 1.19E-04" 4.162 4.494 90 minimum age of intrusion "(*),POTASSIUM VALUE IS AVERAGE OF 4 ANALYSES" 4974 1 23.06 0.6 sanidine conventional K-Ar USGS(D)-DS445 "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 2.77 87 age of volcanism 4974 2 23.22 0.6 biotite conventional K-Ar USGS(D)-DS445 "4.72E-04, 0.584E-04, 1.19E-04*" 8.62 2.9 82 age of volcanism 4975 1 23.29 0.6 sanidine conventional K-Ar USGS(D)-DS442 "4.72E-04, 0.584E-04, 1.19E-04*" 8.8 2.97 83 age of volcanism 4975 2 23.44 0.6 biotite conventional K-Ar USGS(D)-DS442 "4.72E-04, 0.584E-04, 1.19E-04*" 8.36 2.84 66 age of volcanism 4976 1 4.4 0.1 whole rock conventional K-Ar M-FRL1388 "4.72E-04, 0.585E-04, 1.19E-04*" 1.85 0.1175 5648 age of volcanism 0.1174E-10 AND 0.1175E-10 MOL/GR RADIOGENIC ARGON. 4977 1 62.72 2 biotite conventional K-Ar USGS(M)-69AST137 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 8.453 36 minimum age of intrusion 4977 2 68 2 hornblende conventional K-Ar USGS(M)-69AST137 "4.72E-04, 0.585E-04, 1.19E-04*" 0.835 0.8332 54 age of intrusion 4978 1 146.2 4 hornblende conventional K-Ar USGS(M)-69AST252 "4.72E-04, 0.585E-04, 1.19E-04*" 1.055 2.313 88 age of intrusion 4979 1 132.56 4 biotite conventional K-Ar USGS(M)-69AST252A "4.72E-04, 0.585E-04, 1.19E-04*" 8.62 17.07 93 minimum age of intrusion 4980 1 58.61 2 biotite conventional K-Ar USGS(M)-69AST1556 "4.72E-04, 0.585E-04, 1.19E-04*" 8.93 7.659 73 minimum age of metamorphic crystallization 4981 1 24.52 1.2 whole rock conventional K-Ar G-R1786/NMBM-M/46-1 "4.72E-04, 0.585E-04, 1.19E-04*" 4.294 1.526 5369 age of volcanism 4982 1 15.49 0.6 sanidine conventional K-Ar G-F1244/NMBM-L3 "4.72E-04, 0.585E-04, 1.19E-04*" 10.691 2.394 2342 AGE IS QUESTIONABLE AND APPEARS TO BE TOO YOUNG. 4983 1 22.99 1 whole rock conventional K-Ar G-F1245/NMBM-L11 "4.72E-04, 0.585E-04, 1.19E-04*" 5.001 1.666 1921 minimum age of volcanism 4984 1 23.22 0.9 sanidine conventional K-Ar G-F1461/NMBM-L26 "4.72E-04, 0.585E-04, 1.19E-04*" 8.032 2.702 4648 age of volcanism 4985 1 12.02 0.6 feldspar conventional K-Ar G-F1334/NMBM-L19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.386 1.456 4242 age of intrusion 4986 1 37.89 1.2 hornblende conventional K-Ar G-A1369/NMBM-155A-V1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.271 0.7006 5647 age of volcanism 98% PURE CONCENTRATE 4987 1 16.33 1.5 whole rock conventional K-Ar G-R1251/NMBM-248D-V1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.861 0.6755 2435 age of volcanism 4988 1 29.15 1.6 biotite conventional K-Ar G-B1243/NMBM-318D-V1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.508 1.061 2626 minimum age of volcanism "20-30% BIOTITE, 70-80% FELDSPAR AND GROUNDMASS" THE AGE IS QUESTIONABLE BECAUSE OF THE POOR CONCENTRATE OF BIOTITE 4989 1 32.76 1.3 whole rock conventional K-Ar G-R1242/NMBM-325D-70 "4.72E-04, 0.585E-04, 1.19E-04*" 5.078 2.417 5959 age of volcanism 4990 1 35.38 1.2 biotite conventional K-Ar G-B1241/NMBM-325D-79B "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 4.331 6262 age of intrusion 99% BIOTITE 4991 1 30.6 2.8 biotite conventional K-Ar B/NMBM-247D-KA1 "4.83E-04, 0.585E-04" 8.15 5264 age of volcanism AR-40/K-40=0.001791 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963) 4992 1 28 1.4 biotite conventional K-Ar B/NMBM-272C-KA1 "4.83E-04, 0.585E-04" 9.09 41 age of intrusion AR-40/K-40=0.001636 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963) 4993 1 28.3 1.4 biotite conventional K-Ar B/NMBM-272C-KA2 "4.83E-04, 0.585E-04" 8.91 5146 age of intrusion AR-40/K-40=0.001653 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963) 4994 1 14.3 1 whole rock conventional K-Ar B/NMBM-272C-KA3 "4.83E-04, 0.585E-04" 4.67 7464 age of volcanism AR-40/K-40=0.0008344 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963). 4995 1 23.1 whole rock conventional K-Ar B/NMBM-294D-KA1 "4.83E-04, 0.585E-04" 4.55 41 age not evaluated AR-40/K-40=0.001350 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963) 4995 2 42.6 whole rock conventional K-Ar B/NMBM-294D-KA1 "4.83E-04, 0.585E-04" 4.55 72 age not evaluated AR-40/K-40= 0.002489 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963). 4996 1 28.3 1.8 glass conventional K-Ar B/NMBM-313A-KA1 "4.83E-04, 0.585E-04" 3.83 6464 age of volcanism AR-40/K-40=0.00166 AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963) 4997 1 27.2 1.8 glass conventional K-Ar B/NMBM-338A-KA1 "4.83E-04, 0.585E-04" 4.84 7979 age of volcanism AR-40/K-40=0.001588 AGE ALSO PUBLISHED BY WEBER AND BASSETT (1963) 4998 1 18.6 0.9 glass B/NMBM-361C-KA1 "4.83E-04, 0.585E-04" 4.97 60 age of volcanism AGE ALSO PUBLISHED BY WEBER AND BASSETT(1963). 4999 1 23.7 glass conventional K-Ar B/WAB61-7-15-1-P "4.83E-04, 0.585E-04" 5.01 46 age not evaluated AR-40/K-40=0.001388 AGE ALSO PUBLISHED BY WEBER AND BASSETT (1963). 4999 2 33.2 glass conventional K-Ar B/WAB61-7-15-1-P "4.83E-04, 0.585E-04" 5.01 60 minimum age of volcanism AR-40/K-40=0.001939 AGE ALSO PUBLISHED BY WEBER AND BASSETT (1963) 5000 1 32.1 biotite conventional K-Ar SM-187/NMBM "4.83E-04, 0.585E-04" age of volcanism NO ANALYTICAL DATA GIVEN AGE ALSO PUBLISHED BY BURKE AND OTHERS (1963) 5001 1 10.7 whole rock conventional K-Ar SM-188/NMBM "4.83E-04, 0.585E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN BURKE AND OTHERS (1963) ALSO REPORTED THIS AGE 5002 1 33.6 biotite conventional K-Ar SM-190/NMBM-392-632 "4.83E-04, 0.585E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN BURKE AND OTHERS(1963) ALSO PUBLISHED THIS AGE. 5003 1 32.4 biotite conventional K-Ar SM-191/NMBM-249C-SR1 "4.83E-04, 0.585E-04" age of volcanism NO ANALYTICAL DATA GIVEN BURKE AND OTHERS (1963) ALSO REPORTED THIS AGE. 5004 1 37.1 biotite conventional K-Ar SM-1921/NMBM-249C-SR3 "4.83E-04, 0.585E-04" NO ANALYTICAL DATA GIVEN AGE OF VOLCANISM. BURKE AND OTHERS (1963) PUBLISHED THIS AGE AND A K-AR WHOLE ROCK AGE OF 31.9 M.Y. WHICH IS TOO YOUNG 5005 1 30.47 1 muscovite conventional K-Ar G-MO146/AM-X6650 "4.72E-04, 0.585E-04, 1.19E-04*" 5.43 2.402 5060 age of intrusion "SEPARATE WAS 55% MUSCOVITE, 10% BIOTITE , 30% QUARTZ, 5% FELDSPAR, AND TRACE SULFIDES (-40+100 MESH)" 5006 1 25.96 1.3 biotite conventional K-Ar G-BO147/AM-X6651 "4.72E-04, 0.585E-04, 1.19E-04*" 9.04 3.403 4345 minimum age of intrusion 95+% LIGHT BROWN BIOTITE (-40 + 100 MESH) 5007 1 26.87 0.9 sericite conventional K-Ar G-MO216/AM-X6700 "4.72E-04, 0.585E-04, 1.19E-04*" 6.74 2.627 3142 "SEPERATE WAS 90% SERICITE, 5% PLAGIOCLASE, 5% QUARTZ, TRACE OF SULFIDES (-100 + 200 MESH)" AGE OF ALTERATION-MINERALIZATION 5011 1 18.59 0.8 sanidine conventional K-Ar M75 "4.72E-04, 0.584E-04, 1.19E-04*" 7.35 1.977 76 7.38% AND 7.32% K2O AGE OF VOLCANISM 5012 1 19.33 0.8 sanidine conventional K-Ar M74 "4.72E-04, 0.584E-04, 1.19E-04*" 5.65 1.581 81 5.62% AND 5.67% K2O AGE OF VOLCANISM 5014 1 20.9 0.9 biotite conventional K-Ar M28 "4.72E-04, 0.584E-04, 1.19E-04" 4.82 1.806 77 age of intrusion (*) 5015 1 21.1 0.9 biotite conventional K-Ar M29 "4.72E-04, 0.584E-04, 1.19E-04" 7.1 2.678 60 age of intrusion "(*),7.08% AND 7.12% K2O" 5017 1 21.42 1 sanidine conventional K-Ar M49B "4.72E-04, 0.584E-04, 1.19E-04*" 6.34 1.967 83 age of intrusion 6.33% AND 6.35% K2O 5017 2 21.9 0.9 sanidine conventional K-Ar M49B "4.72E-04, 0.584E-04, 1.19E-04*" 9.625 3.053 90 age of intrusion 9.70% AND 9.55% K2O 5017 3 21.65 1.1 biotite conventional K-Ar M49B "4.72E-04, 0.584E-04, 1.19E-04*" 8.945 2.805 62 age of intrusion 8.94% AND 8.95% K2O 5018 1 28.88 1.4 Unk conventional K-Ar M83 "4.72E-04, 0.584E-04, 1.19E-04*" 8.075 3.385 68 8.04% AND 8.11% K2O AGE IS APPARENTLY TOO OLD 5021 1 27.02 3.1 plagioclase conventional K-Ar M90 "4.72E-04, 0.584E-04, 1.19E-04*" 0.745 0.292 39 0.74% AND 0.75% K2O MINIMUM AGE OF VOLCANISM 5022 2 28.2 1.5 plagioclase conventional K-Ar M9OB "4.72E-04, 0.584E-04, 1.19E-04" 0.785 0.392 77 "(*),0.82% AND 0.75% K2O" AGE APPEARS TO BE TOO OLD 5022 3 32.05 1.4 biotite conventional K-Ar M9O "4.72E-04, 0.584E-04, 1.19E-04*" 5.46 2.542 83 5.47% AND 5.45% K2O AGE APPEARS TO BE TOO OLD 5022 4 30.65 1.3 biotite conventional K-Ar M90B "4.72E-04, 0.584E-04, 1.19E-04*" 7.285 3.242 86 7.38% AND 7.19% K2O AGE APPEARS TO BE TOO OLD. 5023 1 13.87 0.6 alunite conventional K-Ar M51A "4.72E-04, 0.584E-04, 1.19E-04*" 6.73 1.349 66 6.73% AND 6.73% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION 5024 1 14.34 0.6 alunite conventional K-Ar M51 "4.72E-04, 0.584E-04, 1.19E-04*" 9.135 1.893 62 9.10% AND 9.17% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION. 5025 1 16.59 0.8 natroalunite conventional K-Ar M48 "4.72E-04, 0.584E-04, 1.19E-04*" 4.815 1.155 59 4.79% AND 4.84% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION. 5026 1 21.86 4.3 alunite conventional K-Ar M53 "4.72E-04, 0.584E-04, 1.19E-04*" 7.655 2.424 13 7.65% AND 7.66% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION. 5027 1 22.53 1 alunite conventional K-Ar M47B "4.72E-04, 0.584E-04, 1.19E-04*" 8.085 2.639 63 8.18% AND 7.99% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION. 5028 1 22.73 1.1 alunite conventional K-Ar M30 "4.72E-04, 0.584E-04, 1.19E-04*" 6.935 2.284 52 6.94% AND 6.93% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION 5029 1 9.44 0.5 alunite conventional K-Ar M256 "4.72E-04, 0.584E-04, 1.19E-04*" 9.055 1.234 49 9.00% AND 9.11% K2O AGE OF HYDROTHERMAL ALTERATION AND/OR MINERALIZATION 5030 1 50.57 2.5 biotite conventional K-Ar KW-66-66 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 6.091 88 age of volcanism 8.19% AND 8.31% K2O 5031 1 52.39 1.9 biotite conventional K-Ar KW-19-66 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 6.275 86 age of volcanism 5031 2 51.56 3.8 plagioclase conventional K-Ar KW-19-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.525 0.3953 87 age of volcanism 0.53% AND 0.52% K2O 5032 1 35.66 3 whole rock conventional K-Ar KW-911-67 "4.72E-04, 0.585E-04, 1.19E-04*" 1.43 0.7414 30 age of volcanism "SAMPLE WAS NOT DEGASSED BY EXTERNAL HEATING OVERNIGHT (AS IS USUAL) BEFORE FUSION, THUS THE LOWER % RADIOGENIC ARGON; 1.48, 1.46, 1.41, AND 1.39% K2O" 5033 1 33.35 1.4 whole rock conventional K-Ar KW-912-67 "4.72E-04, 0.585E-04, 1.19E-04*" 1.545 0.7487 86 age of volcanism 1.54% AND 1.55% K2O 5034 1 31.02 1.6 whole rock conventional K-Ar KW-913-67 "4.72E-04, 0.585E-04, 1.19E-04*" 1.63 0.7343 58 age of volcanism "1.68, 1.67, 1.64, 1.65, 1.62, 1.63, 1.63, 1.60, 1.59, AND 1.60% K2O" "THIS FLOW MAY BE CONTEMPORARY WITH RENOVA FORMATION (KUENZI AND FIELDS, 1971: PETKEWICH, 1978)" 5035 1 45.7 1.7 biotite conventional K-Ar KW-914-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.585 5.72 85 age of volcanism 8.60% AND 8.57% K2O 5036 1 4.35 0.2 whole rock conventional K-Ar KW-2-72 "4.72E-04, 0.585E-04, 1.19E-04*" 1.71 0.1071 51 age of volcanism 1.71% AND 1.71% K2O THIS K-AR AGE REPORTED BY PETERSON AND KUENZI (1974). SAMPLE KW-3-72 WHICH IS FROM THE SAME FLOW GAVE A 3.8 M.Y. AGE 5037 1 3.88 0.4 whole rock conventional K-Ar KW-3-72 "4.72E-04, 0.585E-04, 1.19E-04*" 1.55 0.0866 9 age of volcanism 1.55% AND 1.55% K2O SAMPLE KW-2-72 GAVE AN AGE OF 4.2 M.Y.; IT IS FROM THE SAME BASALT FLOW 5038 1 23.3 1.2 whole rock conventional K-Ar KW-916-11-67 "4.72E-04, 0.585E-04, 1.19E-04*" 1.93 0.6517 86 age of volcanism "1.93, 1.93, 1.90, 1.94% K2O" 5038 2 25.21 1.5 whole rock conventional K-Ar KW-916-11-67 "4.72E-04, 0.585E-04, 1.19E-04*" 1.93 0.7055 50 age of volcanism "1.93, 1.93, 1.90, AND 1.94% K2O; SAMPLE WAS NOT HEATED AT 100 DEGREES C FOR 14 HOURS PRECEDING FUSION, THUS RADIOGENIC ARGON IS LOWER" 5040 1 246.03 7 biotite conventional K-Ar YU-1039 "4.72E-04, 0.584E-04, 1.19E-04*" 8.83 33.51 92 initial age disturbed by later metamorphism 7.31% AND 7.35% K "ANALYTICAL DATA GIVEN IN ARMSTRONG, 1976, ISOCHRON/WEST" 5041 1 111.14 3 biotite conventional K-Ar YU-1038 "4.72E-04, 0.584E-04, 1.19E-04*" 8.84 14.59 83 initial age disturbed by later metamorphism 7.33% AND 7.32% K "ANALYTICAL DATA GIVEN IN ARMSTRONG, 1976, ISOCHRON/WEST" 5042 1 551.85 16 biotite conventional K-Ar YU-1037 "4.72E-04, 0.584E-04, 1.19E-04*" 8.43 78.35 98 initial age disturbed by later metamorphism 7.06% AND 6.94% K "ANALYTICAL DATA GIVEN IN ARMSTRONG, 1976, ISOCHRON/WEST" 5043 1 571.66 17 biotite conventional K-Ar YU-1036 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 88.12 98 initial age disturbed by later metamorphism 7.57% AND 7.53% K "ANALYTICAL DATA GIVEN IN ARMSTRONG, 1976, ISOCHRON/WEST" 5044 1 72.63 2.4 biotite conventional K-Ar DR "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 9.496 95 minimum age of intrusion VERY PURE CONCENTRATE 8.93% AND 8.87% K2O BIOTITE AGE LESS THAN HORNBLENDE AGE PRESUMABLY DUE TO HEATING BY LATER INTRUSIVES 5044 2 78.76 2.2 hornblende conventional K-Ar DR "4.72E-04, 0.585E-04, 1.19E-04*" 0.887 1.028 65 age of intrusion VERY PURE CONCENTRATE 0.887% AND 0.887% K2O 5044 3 78.23 2.1 hornblende conventional K-Ar DR "4.72E-04, 0.585E-04, 1.19E-04*" 0.887 1.021 86 age of intrusion 0.887% AND 0.887% K2O 5045 1 71.55 2.4 biotite conventional K-Ar BH 9850 "4.72E-04, 0.585E-04, 1.19E-04*" 9.41 9.888 90 age of intrusion VERY PURE CONCENTRATE 9.40% AND 9.42% K2O 5045 2 68.83 1.9 hornblende conventional K-Ar BH 9850 "4.72E-04, 0.585E-04, 1.19E-04*" 0.915 0.9243 81 age of intrusion VERY PURE CONCENTRATE 0.915% AND 0.915% K2O 5046 1 72.29 2.4 biotite conventional K-Ar BHS "4.72E-04, 0.585E-04, 1.19E-04*" 9.31 9.886 90 age of intrusion VERY PURE CONCENTRATE 9.30% AND 9.32% K2O 5047 1 72.65 2.7 biotite conventional K-Ar IVP "4.72E-04, 0.585E-04, 1.19E-04*" 9.1 9.712 94 age of intrusion VERY PURE CONCENTRATE 9.12% AND 9.08% K20 5047 2 69.59 1.9 hornblende conventional K-Ar IVP "4.72E-04, 0.585E-04, 1.19E-04*" 0.627 0.6405 80 age of intrusion VERY PURE CONCENTRATE 0.627% AND 0.627% K2O 5048 1 70.44 2.3 biotite conventional K-Ar BC "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 9.049 93 age of intrusion VERY PURE CONCENTRATE 8.77% AND 8.73% K2O 5049 1 71.59 2.4 biotite conventional K-Ar 287-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.475 9.962 95 age of metamorphic crystallization VERY PURE CONCENTRATE 9.45% AND 9.50% K20 AGE INDICATES TIME OF CONTACT METAMORPHISM 5050 1 72.18 2.4 biotite conventional K-Ar 287-2 "4.72E-04, 0.585E-04, 1.19E-04*" 9.47 10.04 91 age of metamorphic crystallization VERY PURE CONCENTRATE 9.43% AND 9.51% K2O AGE INDICATES TIME OF CONTACT METAMORPHISM 5051 1 73.9 2.5 biotite conventional K-Ar USGS(D)MY-508 "4.962E-04, 0.581E-04, 1.1167E-04" 6.125 6.652 88 age of intrusion 6.12% AND 6.13% K2O 5052 1 40 1.7 plagioclase conventional K-Ar CC-3 "4.72E-04, 0.585E-04, 1.19E-04*" 2.739 1.595 38 age of volcanism 5053 1 37.98 1.5 sanidine conventional K-Ar MP-1 "4.72E-04, 0.585E-04, 1.19E-04*" 5.909 3.265 28 age of volcanism 5054 1 36.82 1.4 sanidine conventional K-Ar LM-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.378 5.022 42 age of volcanism 5055 1 27.63 1.1 sanidine conventional K-Ar AVCM-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.673 2.675 45 age of volcanism 5056 1 20.15 0.8 sanidine conventional K-Ar AV-7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.863 2.585 18 age of volcanism THIS AGE MAY BE TOO YOUNG; VOLCANICS MAPPED AS OLIGOCENE-EOCENE 5057 1 2.06 0.1 sanidine conventional K-Ar FM-1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.047 0.2094 16 age of volcanism 5058 1 1.98 0.1 sanidine conventional K-Ar WC-2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.298 0.2364 17 age of volcanism 5059 1 29.91 10 whole rock conventional K-Ar VB-1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.223 0.531 83 minimum age of volcanism 5060 1 1.2 0.6 whole rock conventional K-Ar G-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.393 0.0068 1 BASALT IS PALEOMAGNETICALLY NORMAL AND MAY BE 0.6:0.7 M.Y. OLD. 5076 1 60.1 1.4 illite conventional K-Ar C5-1 "4.76E-04, 0.589E-04, 1.18E-04*" 2.24 1.97 60 MINUS-TWO MICRON FRACTION CLAY MINERALS LAMBDA-BETA=4.76E-10/YR; LAMBDA-EPSILON=0.589E-10/YR; 40K/K=0.000118 ATOMIC RATIO. AGE IS TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5077 1 46.5 1 illite conventional K-Ar FS-1 "4.76E-04, 0.589E-04, 1.18E-04*" 2.54 1.723 60 MINUS-TWO MICRON FRACTION CLAY MINERALS AGE IS TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL 5078 1 104.7 2.5 illite conventional K-Ar AL-35-209 "4.76E-04, 0.589E-04, 1.18E-04*" 1 1.552 71 MINUS-TWO FRACTION OF CHLORITE-RICH AND 1MD ILLITE-RICH CLAY MINERALS AGE TO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5079 1 139.3 3 illite conventional K-Ar AL-35-306 "4.76E-04, 0.589E-04, 1.18E-04*" 1.3 2.711 79 MINUS-TWO MICRON FRACTION OF CHLORITE-RICH AND 1MD ILLITE-RICH CLAY MINERALS MINIMUM AGE OF SEDIMENTATION 5080 1 141.8 2.9 whole rock conventional K-Ar AL-35-201 "4.76E-04, 0.589E-04, 1.18E-04*" 3.81 8.093 87 2 TO 62 MICRON FRACTION OF WHOLE-ROCK MINIMUM AGE OF SEDUMENTATION. 5081 1 245.2 5.2 whole rock conventional K-Ar AL-35-205 "4.76E-04, 0.589E-04, 1.18E-04*" 1.72 6.503 81 2 TO 62 MICRON FRACTION OF WHOLE-ROCK AGE TOO OLD; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5082 1 68.7 1.5 whole rock conventional K-Ar AL-35-207 "4.76E-04, 0.589E-04, 1.18E-04*" 3.63 3.658 85 MINUS-TWO MICRON FRACTION OF WHOLE-ROCK AGE TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL 5083 1 85.4 1.8 whole rock conventional K-Ar AL-35-305 "4.76E-04, 0.589E-04, 1.18E-04*" 3.22 4.056 90 MINUS-TWO MICRON FRACTION OF WHOLE-ROCK AGE TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5084 1 59.2 1.6 illite conventional K-Ar AL-23-303 "4.76E-04, 0.589E-04, 1.18E-04*" 1.3 1.126 46 MINUS-TWO MICRON FRACTION OF ILLITE-RICH AND CHLORITE-RICH CLAY MINERALS AGE TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5085 1 62.9 4.1 chlorite group conventional K-Ar AL-23-211 "4.76E-04, 0.589E-04, 1.18E-04*" 0.571 0.526 18 MINUS-TWO MICRON FRACTION OF CHLORITE-RICH CLAY MINERALS AGE TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5086 1 63.8 1.6 chlorite group conventional K-Ar AL-23-302 "4.76E-04, 0.589E-04, 1.18E-04*" 1.34 1.253 51 MINUS-TWO MICRON FRACTION OF CHLORITE-RICH CLAY MINERALS. AGE TOO YOUNG; ATTEMPT TO DATE THE AGE OF SEDIMENTATION WAS UNSUCCESSFUL. 5087 1 16.5 0.2 whole rock conventional K-Ar CH-61 "4.962E-04, 0.581E-04, 1.1167E-04" 2.403 0.575 73 age of volcanism MESH SIZE (60-100) "PEACH SPRING TUFF HAS BEEN DATED AT 16.9 +/- 0.4 M.Y. (DAMON AND OTHERS, 1966, P. 28)" 5088 1 15.1 0.1 sanidine conventional K-Ar CHNE-152 "4.962E-04, 0.581E-04, 1.1167E-04" 10.18 2.226 46 age of intrusion 5089 1 13.7 0.3 whole rock conventional K-Ar CH-26 "4.962E-04, 0.581E-04, 1.1167E-04" 2.32 0.4575 50 age of volcanism 5090 1 13.1 0.2 whole rock conventional K-Ar CH-47 "4.962E-04, 0.581E-04, 1.1167E-04" 1.288 0.243 55 age of volcanism 5091 1 13.1 0.1 sanidine conventional K-Ar CHNW-159 "4.962E-04, 0.581E-04, 1.1167E-04" 11.87 2.238 85 age of volcanism 5092 1 13 0.5 whole rock conventional K-Ar CHSE-164 "4.962E-04, 0.581E-04, 1.1167E-04" 1.153 0.2158 33 age of volcanism 5093 1 12.7 0.1 sanidine conventional K-Ar CHNW-156 "4.962E-04, 0.581E-04, 1.1167E-04" 12.1 2.214 72 age of intrusion 5094 1 12.6 0.1 sanidine conventional K-Ar AP-04A "4.962E-04, 0.581E-04, 1.1167E-04" 11.44 2.079 76 age of volcanism 5095 1 12.4 0.1 whole rock conventional K-Ar CH-58B "4.962E-04, 0.581E-04, 1.1167E-04" 1.849 0.3311 54 age of volcanism 5096 1 12.4 0.2 sanidine conventional K-Ar CHNE-153 "4.962E-04, 0.581E-04, 1.1167E-04" 9.17 1.638 60 age of volcanism 5097 1 12.4 0.1 sanidine conventional K-Ar CHNE-151 "4.962E-04, 0.581E-04, 1.1167E-04" 10.19 1.821 86 age of intrusion 5098 1 11.7 0.2 biotite conventional K-Ar CHNW-155 "4.962E-04, 0.581E-04, 1.1167E-04" 9.89 1.67 54 age of volcanism 5099 1 10.3 0.1 sanidine conventional K-Ar CHSW-158 "4.962E-04, 0.581E-04, 1.1167E-04" 6.52 0.9708 78 age of intrusion 5100 1 9.2 0.2 whole rock conventional K-Ar CH-111 "4.962E-04, 0.581E-04, 1.1167E-04" 2.38 0.3151 40 age of volcanism 5101 1 7.7 0.5 whole rock conventional K-Ar CHSE-166 "4.962E-04, 0.581E-04, 1.1167E-04" 0.698 0.0772 13 age of volcanism 5102 1 7.5 0.2 whole rock conventional K-Ar CH-78 "4.962E-04, 0.581E-04, 1.1167E-04" 1.985 0.2157 51 age of volcanism 5103 1 7.5 0.2 whole rock conventional K-Ar IL-CH-77-8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.135 0.1225 40 age of volcanism 5104 1 6.8 0.2 whole rock conventional K-Ar CH-92 "4.962E-04, 0.581E-04, 1.1167E-04" 1.592 0.1555 38 age of volcanism 5105 1 1.46 0.03 sanidine conventional K-Ar 77-G55 "4.962E-04, 0.581E-04, 1.1167E-04" 8.36 0.1762 25 age of volcanism MESH SIZE (-50 + 150) A K-AR ISOCHRON AGE OF 1.47 M.Y. ALSO OBTAINED. 5105 2 1.5 0.03 plagioclase conventional K-Ar 77G55 "4.962E-04, 0.581E-04, 1.1167E-04" 1.98 0.0426 28 age of volcanism MESH SIZE (-50+140) A K-AR ISOCHRON AGE OF 1.47 M.Y. ALSO OBTAINED 5105 3 1.58 0.11 hornblende conventional K-Ar 77G55 "4.962E-04, 0.581E-04, 1.1167E-04" 0.56 0.0128 6 age of volcanism MESH SIZE (-50) A K-AR ISOCHRON AGE OF 1.47 M.Y. ALSO OBTAINED 5105 4 1.47 0.04 Unk 40Ar/36Ar-40K/36Ar isochron 77G55 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "A 3-POINT ISOCHRON AGE DETERMINED BY PLOTTING DATA FOR SANIDINE, PLAGIOCLASE, AND HORNBLENDE ON A 40AR/36AR VERSUS 40K/36AR DIAGRAM." 5107 1 51.79 2 biotite conventional K-Ar 300-61B "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 6.43 80 age of volcanism FIELD SAMPLE 7S-111 5108 1 49.83 2 biotite conventional K-Ar 281B "4.72E-04, 0.585E-04, 1.19E-04*" 8.53 6.205 80 age of volcanism FIELD SAMPLE S-1417 5114 1 70.19 2.2 biotite conventional K-Ar G-B1654/H-LS8 "4.72E-04, 0.585E-04, 1.19E-04*" 7.309 7.531 6476 age of intrusion 80% BIOTITE 20% CHLORITE CONCENTRATE 5115 1 69.09 22 biotite conventional K-Ar G-B1652/H-LS6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.119 8.232 6970 age of intrusion SEPARATE 95% PURE 5116 1 69.28 2.2 biotite conventional K-Ar G-B1653/H-LS7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.612 8.757 75 age of intrusion SEPARATE 95% PURE 5117 1 66.06 2.1 sericite conventional K-Ar G-M1655/H-LS7 "4.72E-04, 0.585E-04, 1.19E-04*" 8.601 8.3316 8688 "SEPARATE WAS 80% SERICITE, 10% QUARTZ, 10% FELDSPAR" PROBABLE AGE OF SULPHIDE MINERALIZATION. 5118 1 33.77 2 plagioclase conventional K-Ar UP-G2 no decay constants given* 1.012 0.4966 79 age of volcanism 5119 1 24.34 1.5 plagioclase conventional K-Ar UP-G3 no decay constants given* 0.524 0.1849 84 age of volcanism 5120 1 0.94 0.2 whole rock conventional K-Ar UP-G4 no decay constants given* 1.1 0.0148 39 age of volcanism 5121 1 20.45 1.5 whole rock conventional K-Ar UP-G5 no decay constants given* 2.73 0.8082 80 age of volcanism 5122 1 25.9 1.8 sanidine conventional K-Ar UP-G6 no decay constants given* 6.72 2.5237 98 age of volcanism AGE IS AVERAGE OF THREE ANALYSES 5123 1 27.25 1.5 biotite conventional K-Ar UP-G7 no decay constants given* 7.64 3.0204 83 age of volcanism 5123 2 26.39 1.5 sanidine conventional K-Ar UP-G7 no decay constants given* 5.41 2.0702 96 age of volcanism 5124 1 26.88 1.5 biotite conventional K-Ar UP-M675 no decay constants given* 7.73 3.0134 83 age of volcanism 5124 2 25.98 1.5 sanidine conventional K-Ar UP-M675 no decay constants given* 6.22 2.3429 96 age of volcanism 5125 1 33.13 1.5 biotite conventional K-Ar UP-G9 no decay constants given* 8.6 4.1403 87 age of volcanism 5127 1 61.8 1.4 biotite conventional K-Ar WEST CROSS CREEK-1 (D249B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 7.668 95 age of intrusion "8.45%, 8.51% K2O" 5128 1 66.4 2.2 biotite conventional K-Ar WEST TENN-1 (D2568B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.545 8.319 87 age of intrusion "8.55%, 8.54% K2O" 5130 1 62.2 1.5 biotite conventional K-Ar I-22 "4.962E-04, 0.581E-04, 1.1167E-04" 8.385 7.635 94 age of intrusion "8.39%, 8.38% K2O" 5133 1 72 1.7 biotite conventional K-Ar UTE-3 (D2548B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.41 8.898 76 age of intrusion "8.41%, 8.41% K2O" 5135 1 67.8 1.6 biotite conventional K-Ar LA PLATA-3(D2541B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 8.915 92 age of intrusion "8.94%, 8.98% K2O" 5137 1 67.5 1.6 biotite conventional K-Ar LA PLATA-5(D2542B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.775 8.682 94 age of intrusion "8.79%, 8.76% K2O" 5138 1 110 2 pyroxenes conventional K-Ar RICO-1(D2573PY) "4.962E-04, 0.581E-04, 1.1167E-04" 0.117 0.1917 68 "0.118%, 0.116% K2O" AGE TOO OLD; PROBABLY EXCESS ARGON 5142 1 34.2 0.8 biotite conventional K-Ar SOPRIS-1(D2552B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.275 4.108 87 age of intrusion "8.30%, 8.25% K2O" 5144 1 13.9 0.3 biotite conventional K-Ar RND. MTN.-1(D2567B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 1.736 62 age of intrusion "8.66%, 8.62% K2O" 5145 1 38.4 0.9 biotite conventional K-Ar PORP. CK.-1(D2569B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.89 4.961 84 age of intrusion "8.92%, 8.86% K2O" 5152 1 58.8 2 biotite conventional K-Ar JS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.595 7.39 88 age of intrusion "8.55%, 8.64% K2O" 5156 1 38.5 0.6 sanidine conventional K-Ar LEADVILLE-1 "4.962E-04, 0.581E-04, 1.1167E-04" 11.34 6.36 91 age not evaluated 5158 1 0.51 0.03 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.166 0.0091 15 age of volcanism "RADIOGENEC ARGON-40 VALUE IS AVERAGE OF 0.00925, 0.00894, AND 0.00923E-10 MOL/GM" 5159 1 6.83 0.17 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.625 0.159 51 age of volcanism 5160 1 22.72 0.52 whole rock conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.193 1.387 61 age of intrusion 5161 1 23 0.49 whole rock conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 4.967 1.655 9696 minimum age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 1.663 AND 1.647E-10 MOL/GM 5162 1 24.26 0.52 sanidine conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 10.52 3.703 9898 age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 3.710 AND 3.695E-10 MOL/GM 5163 1 27.03 0.59 feldspar conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 3.23 1.266 7374 age of intrusion RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 1.262 AND 1.269E-10 MOL/GM 5164 1 27.18 0.63 feldspar conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.676 0.656 60 age of intrusion 5165 1 27.21 0.58 biotite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04*" 4.008 1.582 68 age of intrusion "RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 1.557, 1.574, 1.589, AND 160.9E-10 MOL/GM" 5165 2 Unk "4.962E-04, 0.581E-04, 1.1167E-04" CHLORITIZED BIOTITE 5166 1 49.43 0.73 whole rock conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 2.79 1.178 3029 age of intrusion RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 1.208 AND 1.147E-10 MOL/GM 5167 1 29.62 0.62 sanidine conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 7.714 3.28 939294 age of volcanism "RAIOGENIC ARGON-40 VALUE IS AVERAGE OF 3.285, 3.228, AND 3.333E-10 MOL/GM" 5168 1 30.66 1.15 K feldspar conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 11.55 5.142 3132 age meaning uncertain (geologic factors) RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 5.065 AND 5.219E-10 MOL/GM 5169 1 30.69 0.66 anorthoclase conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 2.89 1.288 9292 age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 1.286 AND 1.290E-10 MOL/GM 5170 1 32.88 0.7 biotite conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.49 4.052 92 age of volcanism 5171 1 33.1 0.7 whole rock conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 2.92 1.402 9291 age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 1.410 AND E-10 MOL/GM A SPURIOUS AGE 5172 1 34.22 0.56 sanidine conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 5.197 9295 age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 5.079 AND 5.315 E-10 MOL/GM 5173 1 34.45 0.75 biotite conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 7.608 3.808 8080 age of intrusion RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 3.824 AND 3.793 E-10 MOL/GM 5174 1 34.83 0.78 biotite conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 8.38 4.244 7676 age of intrusion RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 4.281 AND 4.206 E-10 MOL/GM 5175 1 35.16 0.77 biotite conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.029 4.103 81 age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 4.153 AND 4.053 E-10 MOL/GM 5176 1 35.87 0.79 biotite conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 4.338 7474 age of volcanism RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 4.332 AND 4.345 E-10 MOL/GM 5177 1 36.64 0.8 biotite conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 8.04 4.306 77 age of volcanism 5178 1 36.82 0.81 biotite conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 8.365 4.461 age of volcanism "RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 4.520, 4.489, 4.462, 4.348, 4.462, AND 4.589E-10 MOL/GM" 5179 1 56.52 1.2 biotite conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 9.274 7.662 9293 age of intrusion RADIOGENIC ARGON-40 VALUE IS AVERAGE OF 7.616 AND 7.707E-10 MOL/GM 5180 1 32.2 0.3 whole rock conventional K-Ar 77-O7B no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 5180 2 35.9 0.4 whole rock conventional K-Ar 77-O7B no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 5181 1 45 1.4 whole rock conventional K-Ar 77-37B no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 5181 2 41.4 1.3 whole rock conventional K-Ar 77-37B no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 5182 1 28.18 0.9 stilpnomelane conventional K-Ar ME-20/DKA-2410 "4.72E-04, 0.584E-04, 1.19E-04*" 1.34 0.548 54 CONCENTRATE 98% PURE; FUSED AT TEMPERATURE SUITABLE FOR FUSING BIOTITE AGE IS SPURIOUS; FERROSTILPNOMELANE APPARENTLY IS UNSUITABLE FOR RELIABLE K-AR DATING 5182 2 25.07 0.9 stilpnomelane conventional K-Ar ME-20/DKA2473 "4.72E-04, 0.584E-04, 1.19E-04*" 1.34 0.487 54 CONCENTRATE 98% PURE; FUSED AT TENPERATURE SUITABLE FOR FUSING MUSCOVITE FERROSTILPNOMELANE ARPARENTLY UNSUTABLE FOR RELIABLE K-AR DATING AGE IS SPURIOUS; FERROSTILPNOMELANE IS APPARENTLY UNSUITABLE FOR RELIABLE K-AR DATING 5183 1 355.39 20 whole rock conventional K-Ar 1(C-122) "4.72E-04, 0.585E-04, 1.19E-04*" 0.354 2.002 19 "AGE IS A MINIMUM AGE AND IS NOT THE AGE OF INTRUSION. THIS DIKE IS PART OF ""DIKE-SET-I"" OF WINGARD AND BROOKINS, 1964, AGE OF BASIC DIKES ON THE CASTINE-BLUE HILL PENINSULA, MAINE: GEOL. SOC. AMERICA SPEC. PAPER 82, P. 226" 5184 1 164 6 whole rock conventional K-Ar 2(133) "4.72E-04, 0.585E-04, 1.19E-04" 2.79 75 minimum age of intrusion ARGON CONTENT NOT GIVEN "THIS DIKE BELONGS TO ""DIKE-SET-IV"" OF WINGARD AND BROOKINS, 1964, AGE OF BASIC DIKES ON THE CASTINE-BLUE HILL PENINSULA, MAINE: GEOL. SOC. AMERICA SPEC. PAPER 82, P. 226" 5185 1 478.68 50 whole rock conventional K-Ar 3(C-95) "4.72E-04, 0.585E-04, 1.19E-04*" 0.26 2.052 10 "AGE IS TOO OLD. THIS DIKE IS PART OF ""DIKE-SET-I"" OF WINGARD AND BROOKINS, 1964, AGE OF BASIC DIKES ON THE CASTINE-BLUE HILL PENINSULA, MAINE:" 5186 1 182.13 8 whole rock conventional K-Ar 4(C-120) "4.72E-04, 0.585E-04, 1.19E-04*" 1.66 4.58 36 minimum age of intrusion "THIS DIKE IS PART OF ""DIKE-SET-IV"" OF WINGARD AND BROOKINS, 1964, AGE OF BASIC DIKES ON THE CASTINE-BLUE HILL PENINSULA, MAINE: GEOL. SOC. AMERICA SPEC. PAPER 82, P. 226" 5187 1 356.6 15 whole rock conventional K-Ar 5(C-559) "4.72E-04, 0.585E-04, 1.19E-04*" 1.428 8.106 15 minimum age of intrusion THE PENOBSCOT DIORITE INTRUDES THE SOUTH PENOBSCOT GRANITE 5188 1 286.52 15 whole rock conventional K-Ar 6(C-337) "4.72E-04, 0.585E-04, 1.19E-04*" 1.36 6.08 28 AGE APPEARS TOO LOW FOR REASONS UNKNOWN 5189 1 351.19 12 biotite conventional K-Ar 7(C-1256) "4.72E-04, 0.585E-04, 1.19E-04*" 7.89 44.04 88 Brookins and Spooner (1970); Faul and others (1963) minimum age of intrusion PREVIOUS AGES FOR OAK POINT GRANITE REPORTED BY FAUL AND OTHERS (1963) AND BROOKINS AND SPOONER (1970) 5189 2 271.69 15 K feldspar conventional K-Ar 8(C-125F) "4.72E-04, 0.585E-04, 1.19E-04*" 11.38 48.04 81 K-FELDSPAR CONCENTRATE CONSISTS OF MICROCLINE AND PERTHITE--SLIGHT ALTERATION TO KAOLIN NOTED "AGE SEEMS TOO LOW, PROBABLY DUE TO DIFFUSION OF 40AR FROM THE CRYSTAL" 5190 1 422.07 15 biotite conventional K-Ar 9(771) "4.72E-04, 0.585E-04, 1.19E-04*" 7.93 54.29 92 age of intrusion CONCENTRATE 97% BIOTITE 5191 1 377.21 10 biotite conventional K-Ar 10(287) "4.72E-04, 0.585E-04, 1.19E-04*" 6.71 40.53 92 initial age disturbed by later metamorphism "PRESUMABLY CONTACT METAMORPHOSED BY SOUTH PENOBSCOT GRANITE (WINGARD, 1961)" 5192 1 366.71 15 biotite conventional K-Ar 11(552) "4.72E-04, 0.585E-04, 1.19E-04*" 7.35 43.03 46 minimum age of intrusion CONCENTRATIE 98% BIOTITE "AGE MAY HAVE BEEN REDUCED BY DIORITE INTRUSIVE (WINGARD, 1961)" 5193 1 402.81 25 whole rock conventional K-Ar 12(602) "4.72E-04, 0.585E-04, 1.19E-04*" 2.23 14.49 83 age of volcanism BROOKINS AND OTHER (1973) REPORTED AN AGE OF 390 +/- 5 M.Y. FOR THE CASTINE VOLCANICS 5194 1 211.63 6 whole rock conventional K-Ar 13(C-254) "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 27.22 72 AGE APPEARS TOO YOUNG 5195 1 266.28 12 whole rock conventional K-Ar 14(290) "4.72E-04, 0.585E-04, 1.19E-04*" 4.58 18.92 77 AUTHOR THINKS THE AGE IS TOO YOUNG AS FELSITE DIKE RESEMBLES CASTINE-VOLCANICS WHICH ARE DEVONIAN IN AGE 5196 1 161.96 1.6 illite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 18.321 91 THE LESS-THAN-2-MU FRACTION CONTAINED 1MD ILLITE WITH MINOR CHLORITE AND QUARTZ 6.24% AND 6.23% K AVERAGE AGE OF 3 AGES IS 156.9 +/- 2.6 M.Y. WHICH MAY BE THE AGE OF THE FAULTING 5196 2 159.57 1.6 illite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 18.039 90 THE LESS-THAN-2-MU FRACTION CANTAINED 1MD ILLITE WITH MINOR CHLORITE AND QUARTZ 6.24% AND 6.23% K THE AVERAGE AGE OF 3 AGES IS 156.9 +/- 2.6 M.Y. WHICH MAY BE THE AGE OF THE FAULTING 5196 3 158.83 1.5 illite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 17.951 98 THE LESS-THAN-2-MU FRACTION CONTAINED 1MD ILLITE WITH MINOR CHLORITE AND QUARTZ 6.23% AND 6.24%K THE AVERAGE AGE OF 3 AGES IS 156.9 +/- 2.6 M.Y. WHICH MAY BE THE AGE OF THE FAULTING 5197 1 164.31 montmorillonite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.57 16.272 95 "THE LESS-THAN-2-MU FRACTION CONTAINS MONTMORILLONITE, QUARTZ; AND A TRACE OF KAOLINITE" 5.47% AND 5.43% K AVERAGE AGE OF 159.9 +/- 3.2 M.Y. MAY BE THE AGE OF FAULTING 5197 2 161.71 montmorillonite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.57 16.002 95 "THE LESS-THAN-2-MU FRACTION CONTAINED MONTMORILLONITE, QUARTZ, AND A TRACE OF KAOLINITE" 5.47%AND 5.43% K AVERAGE AGE OF 159.9 +/- 3.2 M.Y. MAY BE THE AGE OF FAULTING 5198 1 166.28 clay minerals conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 5.75 14.419 81 THE LESS-THAN-2-MU FRACTION CONTAINED A MIXTURE OF MONTMORILLONITE AND ILLITE WITH MINOR QUARTZ AND A TRACE OF KAOLINITE 4.74% AND 4.79% K AVERAGE AGE OF 164.1 +/- 3.3 M.Y. MAY BE THE AGE OF FAULTING 5198 2 167.93 clay minerals conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 5.75 14.569 84 THE LESS-THAN-2-MU FRACTION CONTAINED A MIXTURE OF MONTMORILLONITE AND ILLITE WITH MINOR QUARTZ AND A TRACE OF KAOLINITE 4.74% AND 4.79% K AVERAGE AGE OF 164.1 +/- 3.3 M.Y. MAY BE THE AGE OF FAULTING 5224 1 14.3 0.8 sanidine conventional K-Ar 7I242 "4.962E-04, 0.581E-04, 1.1167E-04" 6.59 1.3584 21 age of intrusion "ANALYTICAL DATA RELEASED BY E.H. MCKEE, USGS, MENLO PARK, CALIF." 5225 1 15.1 1.6 whole rock conventional K-Ar 6I649 "4.962E-04, 0.581E-04, 1.1167E-04" 0.884 0.1937 17 age of volcanism CRUSHED ANDESITE "ANALYTICAL DATA RELEASED BY E.H. MCKEE, USGS, MENLO PARK, CALIF." 5226 1 6.3 2.3 whole rock conventional K-Ar 7I272 "4.962E-04, 0.581E-04, 1.1167E-04" 0.235 0.0215 4 age of volcanism CRUSHED BASALT "ANALYTICAL DATA RELEASED BY E.H. MCKEE, USGS, MENLO PARK, CALIF." 5243 1 360 18 common micas conventional K-Ar 2 "4.83E-04, 0.585E-04" initial age disturbed by later metamorphism BIOTITE-MUSCOVITE MIXTURE NO ANALYTICAL DATA GIVEN 5244 1 285 14 orthoclase conventional K-Ar 3 "4.83E-04, 0.585E-04" age not evaluated NO ANALYTICAL DATA GIVEN 5245 1 325 16 whole rock conventional K-Ar 6 "4.83E-04, 0.585E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 5246 1 330 16 whole rock conventional K-Ar 7 "4.83E-04, 0.585E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 5247 1 305 15 whole rock conventional K-Ar 8 "4.83E-04, 0.585E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 5248 1 320 16 whole rock conventional K-Ar 9 "4.83E-04, 0.585E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 5249 1 330 16 muscovite conventional K-Ar 13 "4.83E-04, 0.585E-04" NO ANALYTICAL DATA GIVEN PROBABLE AGE OF THE LAST THERMAL EVENT IN THIS REGION 5250 1 355 17 common micas conventional K-Ar 14 "4.83E-04, 0.585E-04" MUSCOVITE-BIOTITE MIXTURE NO ANALYTICAL DATA GIVEN AGE REFLECTS THE EFFECTS OF A REGIONAL THERMAL EVENT ABOUT 330 M.Y. AGO 5251 1 360 18 muscovite conventional K-Ar 15 "4.83E-04, 0.585E-04" NO ANALYTICAL DATA GIVEN AGE REFLECTS THE EFFECTS OF A REGIONAL THERMAL EVENT ABOUT 330 M.Y. AGO 5252 1 395 20 muscovite conventional K-Ar 16 "4.83E-04, 0.585E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 5253 1 460 24 biotite conventional K-Ar 16 "4.83E-04, 0.585E-04" age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 5254 1 330 16 biotite conventional K-Ar 17 "4.83E-04, 0.585E-04" NO ANALYTICAL DATA GIVEN AGE REFLECTS THE EFFECTS OF A REGIONAL THERMAL EVENT ABOUT THIS TIME 5255 1 213 K feldspar conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 12.66 41.143 96 age meaning uncertain (geologic factors) AGE RECALCULATED WITH IUGS RECOMMENDED DECAY CONSTANTS 5264 1 322.15 6 whole rock conventional K-Ar ALV-421-1-3-A "4.72E-04, 0.585E-04, 1.19E-04*" 3.98 20.21 9595 initial age disturbed by later metamorphism K=3.31 AND 3.29%; 40AR(RAD)=4.52 AND 4.53 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD THE CONCORDIA INTERCEPT AGE OF 422 M.Y. AS REPORTED BY HERMES AND OTHERS (1978) MAY APPLY TO THIS GRANITE 5265 1 275.96 16 whole rock conventional K-Ar ALV-423-1-1-A "4.72E-04, 0.585E-04, 1.19E-04*" 3.96 17 9294 initial age disturbed by later metamorphism K=3.35 AND 3.24%; 40AR(RAD)=4.06 AND 3.56 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD THE CONCORDIA INTERCEPT AGE OF 422 M.Y. AS REPORTED BY HERMES AND OTHERS (1978) MAY APPLY TO THIS GRANITE 5266 1 338.85 20 whole rock conventional K-Ar ALV-427-1-1-A "4.72E-04, 0.585E-04, 1.19E-04*" 0.3 1.61 6967 minimum age of intrusion K=0.25 AND 0.25%; 40AR(RAD)=0.36 AND 0.36 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD 5267 1 254.9 15 whole rock conventional K-Ar ALV-342-2-2-A "4.72E-04, 0.585E-04, 1.19E-04*" 3.95 15.57 9191 minimum age of volcanism K=3.27 AND 3.29%; 40AR(RAD)=3.43 AND 3.54 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD 5268 1 280.35 14 whole rock conventional K-Ar ALV-430-2-1-A "4.72E-04, 0.585E-04, 1.19E-04*" 5.1 22.27 9193 initial age disturbed by later metamorphism K=4.20 AND 4.25%; 40AR(RAD)=4.95 AND 5.03 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD THE CONCORDIA INTERCEPT AGE OF 422 M.Y. AS REPORTED BY HERMES AND OTHERS (1978) MAY APPLY TO THIS GRANITE 5269 1 415.99 20 biotite conventional K-Ar ALV-429-1-1-B+A "4.72E-04, 0.585E-04, 1.19E-04*" 3.67 24.72 9597 minimum age of intrusion ALTERED BIOTITE K=3.05 AND 3.05%; 40AR(RAD)=5.45 AND 5.62 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD HERMES AND OTHERS (1978) REPORTED A CONCORDIA INTERCEPT AGE OF 422 M.Y. FOR THIS SAMPLE 5270 1 313.18 9 whole rock conventional K-Ar ALV-445-1-7 "4.72E-04, 0.585E-04, 1.19E-04*" 4.73 23.29 9595 initial age disturbed by later metamorphism K=4.02 AND 3.84%; 40AR(RAD)=5.30 AND 5.15 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD HERMES AND OTHERS (1978) REPORTED A CONCORDIA INTERCEPT AGE OF 422 M.Y. FOR THIS SAMPLE 5270 2 350.38 10 biotite conventional K-Ar ALV-445-1-7 "4.72E-04, 0.585E-04, 1.19E-04*" 2.22 12.36 9292 initial age disturbed by later metamorphism IMPURE BIOTITE K=1.81 AND 1.88%; 40AR(RAD)=2.74 AND 2.81 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD HERMES AND OTHERS (1978) REPORTED A CONCORDIA INTERCEPT AGE OF 422 M.Y. FOR THIS SAMPLE 5271 1 375.39 11 whole rock conventional K-Ar ALV-431-2-4-A "4.72E-04, 0.585E-04, 1.19E-04*" 3.81 22.89 9493 initial age disturbed by later metamorphism K=3.15 AND 3.17%; 40AR(RAD)=5.27 AND 5.00 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD HERMES AND OTHERS (1978) REPORTED A CONCORDIA INTERCEPT AGE OF 422 M.Y. FOR THIS SAMPLE 5271 2 402.22 12 biotite conventional K-Ar ALV-431-2-4-A "4.72E-04, 0.585E-04, 1.19E-04*" 5.42 35.16 9595 initial age disturbed by later metamorphism K=4.55 AND 4.45%; 40AR(RAD)=7.92 AND 7.85 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD HERMES AND OTHERS (1978) REPORT A CONCORDIA INTERCEPT AGE OF 422 M.Y. FOR THIS SAMPLE 5272 1 365.99 11 biotite conventional K-Ar ALV-349-2-1-A "4.72E-04, 0.585E-04, 1.19E-04*" 1.39 8.12 9798 initial age disturbed by later metamorphism "BIOTITE 15%, PYROXENE (OR HORNBLENDE) 80%, AND OTHER MINERALS 5% --R.D. BALLARD" K=1.11 AND 1.20%; 40AR(RAD)=1.70 AND 1.94 X E-5 CC/GM; ANALYTICAL DATA RELEASED BY R.D. BALLARD THE CONCORDIA INTERCEPT AGE OF 422 M.Y. AS REPORTED BY HERMES AND OTHERS (1978) MAY APPLY TO THIS GRANITE 5273 1 262 8 whole rock conventional K-Ar SCUBA-1-1 no decay constants given initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN THE CONCORDIA INTERCEPT AGE OF 422 M.Y. AS REPORTED BY HERMES AND OTHERS (1978) MAY APPLY TO THIS GRANITE 5274 1 400.3 19 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 53.04 97 initial age disturbed by later metamorphism "ANALYTICAL DATA TAKEN FROM ZARTMAN AND OTHERS, 1970, SAMPLE NO. 1 (CONN), P. 3360" 5275 1 321.64 15 hornblende conventional K-Ar HB47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.478 2.423 29 initial age disturbed by later metamorphism ESTIMATED 2% BIOTITE IMPURITY POTASSUIM DETERMINED BY ISOTOPE DILUTION "U-PB ZIRCON AGES AROUND 500-550 M.M. (SEE DAVIS AND OTHERS, 1960) REPORTED FOR THIS TONALITE" 5276 1 305.08 10 hornblende conventional K-Ar HB21 "4.72E-04, 0.585E-04, 1.19E-04*" 2.47 11.82 71 initial age disturbed by later metamorphism ESTIMATED 8% BIOTITE IMPURITY POTASSUIM DETRMINED BY ISOTOPE DILUTION TILTON AND OTHERS (1959) REPORTED U-PB ZIRCON AGES OF 355-450 M.Y. FOR THIS GRANITE 5277 1 979.14 30 hornblende conventional K-Ar HP20 "4.72E-04, 0.585E-04, 1.19E-04*" 1.585 29.67 83 age of metamorphic crystallization ESTIMATED 0.5% BIOTITE IMPURITY K=1.34% AND 1.29% BY ISOTOPE DILUTION TILTON AND OTHERS (1960) REPORT BIOTITE K-AR AGE OF 1010 M.Y. FOR THIS ROCK 5278 1 919.77 25 hornblende conventional K-Ar HSK "4.72E-04, 0.585E-04, 1.19E-04*" 2.02 34.89 82 minimum age of intrusion QUITE PURE HORNBLENDE CONCENTRATE POTASSIUM DETRMINED BY ISOTOPE DILUTION THIS AGE AGREES WELL WITH OTHER RADIOMETRIC AGES REPORTED BY TILTON AND OTHERS (1960) FOR THIS GRANITE 5279 1 840.62 25 hornblende conventional K-Ar HG-15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.637 9.82 62 2% BIOTITE IMPURITY "(0.532, 0.542% K--FLAME PHOTOMETRY; 0.508 AND 0.531% K--ISOTOPE DILUTION, AVERAGE=0.528%" "AGE AGREES WITH 207PB/206PB AGE OF 800 +/- 50 M.Y. (DAVIS AND OTHERS, 1962, J.G.R., V. 67, P. 1987-1966), HOWEVER THE AGE IS HIGHLY DISCORDANT WITH REGIONAL K-AR AGES, THE SAMPLE MAY CONTAIN EXCESS ARGON--COMPILER" 5280 1 912.15 25 hornblende conventional K-Ar HB15 "4.72E-04, 0.585E-04, 1.19E-04*" 2 34.18 91 minimum age of metamorphic crystallization QUITE PURE HORNBLENDE CONCENTRATE TILTON AND OTHERS (1960) REPORTED U-PB ZIRCON AGES OF AROUND 1000 M.Y. FOR THIS GNEISS 5281 1 317.04 10 hornblende conventional K-Ar H3006 "4.72E-04, 0.585E-04, 1.19E-04*" 2.02 10.08 56 initial age disturbed by later metamorphism HORNBLENDE CONCENTRATE INCLUDED 5% BIOTITE K=1.68% AND 1.68% BY ISOTOPE DILUTION 5282 1 1194.71 30 hornblende conventional K-Ar H4068 "4.72E-04, 0.585E-04, 1.19E-04*" 1.2 29.27 85 age of uplift and cooling QUITE PURE HORNBLENDE CONCENTRATE POTASSUIM DETERMINED BY ISOTOPE DILUTION 5283 1 335 13 muscovite conventional K-Ar BMD-16M "4.8E-04, 0.58E-04*" 10.11 53.54 age of intrusion 12-INCH WIDE AND 6-INCH THICK MUSCOVITE BOOK 5283 2 331 13 muscovite conventional K-Ar BMD-16M "4.8E-04, 0.58E-04*" 10.48 54.88 age of intrusion A 12-INCH WIDE AND 6-INCH THICK MUSCOVITE BOOK 5283 3 209 10 K feldspar conventional K-Ar BMD-16P "4.8E-04, 0.58E-04*" 12.53 40.02 "AGE IS SPURIOUS, PROBABLE LEAKAGE OF RADIOGENIC ARGON" 5284 1 326 13 muscovite conventional K-Ar BMD-3B "4.8E-04, 0.58E-04*" 10.22 52.65 age of intrusion LARGE 6-INCH WIDE MUSCOVITE BOOK 5284 2 431.9 94 albite conventional K-Ar BMD-3A "4.8E-04, 0.58E-04*" 0.47 3.302 80 age not evaluated 5284 3 394.28 85 albite conventional K-Ar BMD-3D "4.8E-04, 0.58E-04*" 0.45 2.855 80 age not evaluated 5285 1 324 13 muscovite conventional K-Ar BND-15 "4.8E-04, 0.58E-04*" 8.7 44.39 age of intrusion 5286 1 330 13 common micas conventional K-Ar BMD-10 "4.8E-04, 0.58E-04*" 8.29 43.23 age of intrusion BIOTITE-MUSCOVITE MIXTURE 5286 2 302.22 13 common micas conventional K-Ar BMD-10 "4.8E-04, 0.58E-04*" 8.28 39.22 BIOTITE-MUSCOVITE MIXTURE THIS AGE APPEARS TOO YOUNG 5287 1 264 10 biotite conventional K-Ar BMD-18A "4.8E-04, 0.58E-04*" 7.8 31.92 RADIOGENIC 40-AR=6.96XE-5 AND 7.35XE-5 CC/GRAM AGE TOO YOUNG 5288 1 343 15 biotite conventional K-Ar BMD-21 "4.8E-04, 0.58E-04*" 2.01 10.93 initial age disturbed by later metamorphism MIXTURE OF AMPHIBOLE AND BIOTITE 5289 1 beryl BMD-9 "4.8E-04, 0.58E-04" 20.07 K IS LESS THAN 0.05%; NO AGE CALCULATED 5290 1 beryl BMD-2D "4.8E-04, 0.58E-04" 24.98 K IS LESS THAN 0.1%; NO AGE CALCULATED 5291 1 386.05 11 biotite conventional K-Ar L-607B "4.72E-04, 0.584E-04, 1.18E-04*" 8.76 54.29 95 initial age disturbed by later metamorphism 8% CHLORITE IN BIOTITE CONCENTRATE POTASSIUM DETERMINED BY ISOTOPE DILUTION 5291 2 407.59 12 whole rock conventional K-Ar L-607WR "4.72E-04, 0.584E-04, 1.18E-04*" 4.18 27.52 96 age of metamorphic crystallization POTASSIUM DETERMINED BY ISOTOPE DILUTION 5292 1 357.2 11 biotite conventional K-Ar L-480B "4.72E-04, 0.584E-04, 1.18E-04*" 9.81 55.79 96 K=8.14% AND 8.15% (ISOTOPE DILUTION) AGE APPARENTLY REFLECTS THE TIME OF A THERMAL EVENT 5292 2 361.53 11 muscovite conventional K-Ar L-480M "4.72E-04, 0.584E-04, 1.18E-04*" 10.81 62.3 93 K=8.95% AND 8.99% (ISOTOPE DILUTION) AGE APPARENTLY REFLECTS THE TIME OF A THERMAL EVENT 5293 1 445.5 13 whole rock conventional K-Ar L-477WR "4.72E-04, 0.584E-04, 1.18E-04*" 2.58 18.77 97 age meaning uncertain (geologic factors) POTASSIUM DETERMINED BY ISOTOPE DILUTION 5294 1 420.49 12 whole rock conventional K-Ar L-611WR "4.72E-04, 0.584E-04, 1.18E-04*" 4.11 28.02 94 age meaning uncertain (geologic factors) K=3.40% AND 3.42% (ISOTOPE DILUTION) 5296 1 359.09 14 biotite conventional K-Ar L-155B "4.72E-04, 0.584E-04, 1.18E-04*" 9.01 51.54 86 POTASSIUM DETERMINED BY ISOTOPE DILUTION "AGE APPARENTLY EFFECTED BY PERMIAN THERMAL EVENT (SEE ZARTMAN AND OTHERS,1970)" 5297 1 283.34 11 biotite conventional K-Ar L-152B "4.72E-04, 0.584E-04, 1.18E-04*" 8.61 38.03 83 3% CHLORITE PRESENT IN THE BIOTITE POTASSIUM DETERMINED BY ISOTOPE DILUTION "AGE APPARENTLY EFFECTED BY PERMIAN THERMAL EVENT (SEE ZARTMAN AND OTHERS, 1970)" 5298 1 333.19 13 muscovite conventional K-Ar L-154 "4.72E-04, 0.584E-04, 1.18E-04*" 10.02 52.79 94 POTASSIUM BY ISOPOTE DILUTION "AGE APPARENTLY EFFECTED BY A PERMIAN THERMAL EVENT (SEE ZARTMAN AND OTHERS, 1970)" 5299 1 339.46 15 muscovite conventional K-Ar HOOT OWL M "4.72E-04, 0.583E-04*" 10.47 56.3 minimum age of intrusion 5300 1 340.06 15 muscovite conventional K-Ar MCKINNEY "4.72E-04, 0.583E-04*" 9.93 53.5 minimum age of intrusion 5300 2 354.49 15 muscovite conventional K-Ar MCKINNEY "4.72E-04, 0.583E-04*" 9.93 56 minimum age of intrusion 5301 1 346.75 15 muscovite conventional K-Ar MINPRO M "4.72E-04, 0.583E-04*" 10.81 59.5 minimum age of intrusion 5302 1 349.69 13 muscovite - biotite conventional K-Ar L-30 M+B "4.72E-04, 0.583E-04*" 9.36 52 93 minimum age of intrusion MIXTURE OF MUSCOVITE AND BIOTITE 5303 1 363.29 13 biotite conventional K-Ar L-141B "4.72E-04, 0.583E-04*" 8.94 51.8 95 initial age disturbed by later metamorphism THE GNEISS HAS UNDERGONE TWO PERIODS OF METAMORPHISM--COMPILER 5304 1 440.74 15 biotite conventional K-Ar BK-149B "4.72E-04, 0.583E-04*" 3.52 25.3 90 LOW POTASSIUM CONTENT SUGGESTS IMPURE BIOTITE--COMPILER APPROX.IMATE AGE OF METAMORPHISM (?)--COMPILER 5305 1 462.5 21 biotite conventional K-Ar BK-61B "4.72E-04, 0.583E-04*" 1.78 13.51 73 LOW POTASSIUM CONTENT SUGGESTS IMPURE BIOTITE--COMPILER APPROX.IMATE AGE OF METAMORPHISM (?)--COMPILER 5306 1 704.08 23 biotite conventional K-Ar L-330B "4.72E-04, 0.583E-04*" 7.89 97.83 93 initial age disturbed by later metamorphism THE MINERALS IN THE PRECAMBRIAN GNEISS HAVE LOST ARGON DUE TO PALEZOIC METAMORHISM--COMPILER 5307 1 346.01 13 muscovite conventional K-Ar L-136M "4.72E-04, 0.583E-04*" 10.89 59.8 93 minimum age of intrusion 5308 1 353.77 13 muscovite conventional K-Ar L-139 M "4.72E-04, 0.583E-04*" 10.13 57 89 minimum age of intrusion 5309 1 448.85 14 biotite conventional K-Ar L-140 B "4.72E-04, 0.583E-04*" 8.9 65.3 7077 40AR-RAD=0.262 AND 0.260 PPM AGE IS ANOMOLOUSLY OLD COMPAIRED TO THE RB-SR AGE ON THE SAME SAMPLE AND REGIONAL K-AR MINERAL AGES; THE SAMPLE MAY CONTAIN EXCESS ARGON--COMPILER 5310 1 362.13 13 biotite conventional K-Ar L-16 B "4.72E-04, 0.583E-04*" 8.66 50 93 minimum age of intrusion 5311 1 357.58 13 biotite conventional K-Ar L-118 B "4.72E-04, 0.583E-04*" 9.01 51.3 79 minimum age of intrusion 5312 1 321.02 11 muscovite conventional K-Ar L-119 M "4.72E-04, 0.583E-04*" 10.28 52 93 minimum age of intrusion 5313 1 252.39 9 biotite conventional K-Ar L-125B "4.72E-04, 0.583E-04*" 9.11 35.53 91 minimum age of intrusion 5314 1 282.75 10 biotite conventional K-Ar L-127B "4.72E-04, 0.583E-04*" 9.31 41.03 90 initial age disturbed by later metamorphism 5315 1 298.75 10 muscovite conventional K-Ar L-128M "4.72E-04, 0.583E-04*" 10.27 48.04 87 age of intrusion 5316 1 314.37 11 biotite conventional K-Ar L-129B "4.72E-04, 0.583E-04*" 9.16 45.29 92 initial age disturbed by later metamorphism 5317 1 328.81 12 muscovite conventional K-Ar L-132M "4.72E-04, 0.583E-04*" 10.07 52.29 94 initial age disturbed by later metamorphism 5317 2 352.61 13 biotite conventional K-Ar L-132B "4.72E-04, 0.583E-04*" 8.39 47.04 94 initial age disturbed by later metamorphism 5318 1 401.99 14 biotite conventional K-Ar L-41B "4.72E-04, 0.583E-04*" 9.07 58.8 92 initial age disturbed by later metamorphism 5319 1 231.07 9 biotite conventional K-Ar L-124B "4.72E-04, 0.583E-04*" 4.37 15.51 76 minimum age of intrusion 5319 2 238.05 9 biotite conventional K-Ar L-124B "4.72E-04, 0.583E-04*" 4.37 16.01 55 minimum age of intrusion 5320 1 314.79 11 phlogopite conventional K-Ar L-120P "4.72E-04, 0.583E-04*" 7.63 37.78 89 minimum age of metamorphic crystallization 5321 1 425.14 16 biotite conventional K-Ar L-22B "4.72E-04, 0.583E-04*" 7.25 50.04 92 initial age disturbed by later metamorphism 5322 1 439.37 15 biotite conventional K-Ar L-133B "4.72E-04, 0.583E-04*" 7.51 53.79 64 initial age disturbed by later metamorphism 5323 1 363.38 13 biotite conventional K-Ar L-146B "4.72E-04, 0.583E-04*" 9.54 55.29 94 initial age disturbed by later metamorphism 5324 1 808.94 27 biotite conventional K-Ar L-149B "4.72E-04, 0.583E-04*" 8.05 118.3 97 AGE MAY BE A MINIMUN FOR THE AGE OF METAMORPHISM 5325 1 680.83 22 biotite conventional K-Ar L-328B "4.72E-04, 0.583E-04*" 7.27 86.57 93 initial age disturbed by later metamorphism 5326 1 657.58 22 biotite conventional K-Ar L-331B "4.72E-04, 0.583E-04*" 8.28 94.58 97 initial age disturbed by later metamorphism 5327 1 648.88 22 biotite conventional K-Ar L-332B "4.72E-04, 0.583E-04*" 7.7 86.57 95 initial age disturbed by later metamorphism 5328 1 532.86 18 biotite conventional K-Ar L-333B "4.72E-04, 0.583E-04*" 7.99 71.31 95 initial age disturbed by later metamorphism 5329 1 349.77 13 muscovite conventional K-Ar WESTMORE M "4.72E-04, 0.583E-04*" 8.87 49.29 86 minimum age of intrusion 5330 1 375.82 13 biotite conventional K-Ar L-25B "4.72E-04, 0.583E-04*" 8.36 50.29 92 initial age disturbed by later metamorphism 5365 1 525.44 10 whole rock conventional K-Ar 434W "4.72E-04, 0.585E-04, 1.19E-04*" 0.293 2.573 88 age of intrusion 5365 2 513 10 whole rock conventional K-Ar 434W "4.72E-04, 0.585E-04, 1.19E-04*" 0.293 2.503 91 age of intrusion 5366 1 508.45 10 riebeckite conventional K-Ar 533H "4.72E-04, 0.585E-04, 1.19E-04*" 1.606 13.58 96 age of intrusion BELIEVED TO BE THE YOUNGEST GRANITIC ROCK IN THE WICHITA MOUNTAINS 5366 2 506.49 10 riebeckite conventional K-Ar 533H "4.72E-04, 0.585E-04, 1.19E-04*" 1.606 13.52 95 age of intrusion 5367 1 503.29 10 whole rock conventional K-Ar 435W "4.72E-04, 0.585E-04, 1.19E-04*" 1.729 14.45 95 age of intrusion 5367 2 514.2 10 whole rock conventional K-Ar 435W "4.72E-04, 0.585E-04, 1.19E-04*" 1.729 14.81 94 age of intrusion 5367 3 512.68 10 whole rock conventional K-Ar 435W "4.72E-04, 0.585E-04, 1.19E-04*" 1.729 14.76 94 age of intrusion 5367 4 510.43 10 biotite conventional K-Ar 435B "4.72E-04, 0.585E-04, 1.19E-04*" 6.977 59.26 97 age of intrusion 5367 5 516.5 10 biotite conventional K-Ar 435B "4.72E-04, 0.585E-04, 1.19E-04*" 6.977 60.07 98 age of intrusion 5368 1 739 15 whole rock conventional K-Ar 436W "4.72E-04, 0.585E-04, 1.19E-04*" 0.135 1.774 80 SPURIOUS AGE; EXCESS AR-40 PROBABLY PRESENT 5368 2 726 15 whole rock conventional K-Ar 436W "4.72E-04, 0.585E-04, 1.19E-04*" 0.135 1.737 79 "SPURIOUS AGE, EXCESS AR-40 PROBABLY PRESENT" 5368 3 758 15 whole rock conventional K-Ar 436W "4.72E-04, 0.585E-04, 1.19E-04*" 0.135 1.832 65 "SPURIOUS AGE, EXCESS AR-40 PROBABLY PRESENT" 5368 4 820 15 whole rock conventional K-Ar 436W "4.72E-04, 0.585E-04, 1.19E-04*" 0.135 2.017 75 "SPURIOUS AGE, EXCESS AR-40 PROBABLY PRESENT" 5369 1 719 15 plagioclase conventional K-Ar 436V "4.72E-04, 0.585E-04, 1.19E-04*" 0.1527 1.942 70 "SPURIOUS AGE, EXCESS AR-40 PROBABLY PRESENT" 5369 2 708.28 15 plagioclase conventional K-Ar 436V "4.72E-04, 0.585E-04, 1.19E-04*" 0.1527 1.907 80 "SPURIOUS AGE, EXCESS AR-40 PROBABLY PRESENT" 5369 3 705.51 15 plagioclase conventional K-Ar 436V "4.72E-04, 0.585E-04, 1.19E-04*" 0.1527 1.898 72 "SPURIOUS AGE, EXCESS AR-40 PROBABLY PRESENT" 5370 1 515.72 10 whole rock conventional K-Ar 437W "4.72E-04, 0.585E-04, 1.19E-04*" 0.1765 1.517 85 age of intrusion 5370 2 514.54 10 whole rock conventional K-Ar 437W "4.72E-04, 0.585E-04, 1.19E-04*" 0.1765 1.513 83 age of intrusion 5370 3 495.15 10 plagioclase conventional K-Ar 437V "4.72E-04, 0.585E-04, 1.19E-04*" 0.2415 1.981 90 minimum age of intrusion 5370 4 495.15 10 plagioclase conventional K-Ar 437V "4.72E-04, 0.585E-04, 1.19E-04*" 0.2415 1.981 87 minimum age of intrusion 5370 5 501.48 10 plagioclase conventional K-Ar 437V "4.72E-04, 0.585E-04, 1.19E-04*" 0.2415 2.01 81 age of intrusion 5371 1 496.35 10 whole rock conventional K-Ar 438W "4.72E-04, 0.585E-04, 1.19E-04*" 0.5884 4.84 90 minimum age of intrusion 5371 2 504.4 10 whole rock conventional K-Ar 438W "4.72E-04, 0.585E-04, 1.19E-04*" 0.5884 4.93 89 age of intrusion 5372 1 517.45 10 biotite conventional K-Ar 957B "4.72E-04, 0.585E-04, 1.19E-04*" 7.638 65.9 94 age of intrusion 5372 2 518.13 10 biotite conventional K-Ar 957B "4.72E-04, 0.585E-04, 1.19E-04*" 7.638 66 93 age of intrusion 5373 1 72.73 1.5 whole rock conventional K-Ar 443W "4.72E-04, 0.585E-04, 1.19E-04*" 1.256 1.342 86 age of intrusion 5373 2 69.81 1.5 whole rock conventional K-Ar 443W "4.72E-04, 0.585E-04, 1.19E-04*" 1.256 1.287 79 age of intrusion 5373 3 74.25 1.5 nepheline group conventional K-Ar 443N "4.72E-04, 0.585E-04, 1.19E-04*" 4.916 5.365 89 age of intrusion 5373 4 74.65 1.5 nepheline group conventional K-Ar 443N "4.72E-04, 0.585E-04, 1.19E-04*" 4.916 5.394 76 age of intrusion 5374 1 69.82 5 pyroxenes conventional K-Ar 443X "4.72E-04, 0.585E-04, 1.19E-04*" 0.0483 0.0495 22 age of intrusion 5374 2 71.89 5 pyroxenes conventional K-Ar 443X "4.72E-04, 0.585E-04, 1.19E-04*" 0.0483 0.051 22 age of intrusion 5375 1 69.01 1.5 whole rock conventional K-Ar 562W "4.72E-04, 0.585E-04, 1.19E-04*" 0.3615 0.3661 43 minimum age of intrusion 5375 2 69.23 1.5 whole rock conventional K-Ar 562W "4.72E-04, 0.585E-04, 1.19E-04*" 0.3615 0.3673 43 minimum age of intrusion 5376 1 249.55 5 nepheline group conventional K-Ar 444N "4.72E-04, 0.585E-04, 1.19E-04*" 6.073 23.4 98 age of intrusion 5376 2 247.26 5 nepheline group conventional K-Ar 444N "4.72E-04, 0.585E-04, 1.19E-04*" 6.073 23.17 97 age of intrusion 5376 3 237.49 5 biotite conventional K-Ar 444B "4.72E-04, 0.585E-04, 1.19E-04*" 8.989 32.85 93 minimum age of intrusion 5376 4 239.25 5 biotite conventional K-Ar 444B "4.72E-04, 0.585E-04, 1.19E-04*" 8.989 33.11 94 minimum age of intrusion 5377 1 305.37 30 margarite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.062 0.297 22 A COOLING AGE 5377 2 485 chlorite group conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.0026 minimum age of intrusion RADIOGENIC AR-40 VALUE LESS THAN 0.021XE-10MOL/GM 5378 1 321.06 10 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 4.23 21.4 91 BIOTITE CONCENTRATE CONTAINS CONSIDERABLE CHLORITE A COOLING AGE 5379 1 336.93 10 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 6 32 81 MUSCOVITE CONCENTRATE CONTAINS QUARTZ AND ROCK FRAGMENTS A COOLING AGE 5380 1 190 6 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN AGREES IN AGE WITH THE AGE OF THE PALISADE SILL OF NEW JERSEY AND THE CONNECTICUT VALLEY DIABASE INTRUSIVES 5381 1 289 15 whole rock conventional K-Ar R-3821 "4.742E-04, 0.558E-04*" 4.16 18.8 95 Hurley and others (1960) initial age disturbed by later metamorphism 5382 1 178 8 biotite conventional K-Ar B-3126B "4.742E-04, 0.558E-04" 8.07 94 Hurley and others (1960) age of intrusion K=6.67% AND 6.73% 5383 1 242 11 biotite conventional K-Ar B-3815 "4.742E-04, 0.558E-04*" 8.56 31.98 97 Hurley and others (1960) initial age disturbed by later metamorphism K=7.09% AND 7.12% 5384 1 235 11 biotite conventional K-Ar B-3816 "4.742E-04, 0.558E-04*" 8.34 30.11 88 Hurley and others (1960) initial age disturbed by later metamorphism K=6.88% AND 6.96% 5385 1 246 12 biotite conventional K-Ar B-3814 "4.742E-04, 0.558E-04*" 7.6 28.8 93 Hurley and others (1960) initial age disturbed by later metamorphism K=6.28% AND 6.33% 5386 1 259 13 whole rock conventional K-Ar R-3917 "4.742E-04, 0.558E-04*" 4.71 18.92 94 Hurley and others (1960) initial age disturbed by later metamorphism K=3.87% AND 3.95% 5387 1 236 12 whole rock conventional K-Ar R-3920 "4.742E-04, 0.558E-04*" 3.4 12.36 87 Hurley and others (1960) initial age disturbed by later metamorphism K=2.78% AND 2.86% 5388 1 270 13 whole rock conventional K-Ar R-3818 "4.742E-04, 0.558E-04*" 4.86 20.36 98 Hurley and others (1960) initial age disturbed by later metamorphism K=3.99% AND 4.07% 5388 2 267 13 whole rock conventional K-Ar R-3818 "4.742E-04, 0.558E-04*" 4.85 20.11 98 initial age disturbed by later metamorphism K=3.99% AND 4.07% 5389 1 282 13 biotite conventional K-Ar B-3817 "4.742E-04, 0.558E-04*" 3.98 17.47 92 Hurley and others (1960) age not evaluated IMPURE BIOTITE CONCENTRATE K=3.31% AND 3.28% 5389 2 253 12 biotite conventional K-Ar B-3817A "4.742E-04, 0.558E-04*" 7.75 30.33 91 Hurley and others (1960) initial age disturbed by later metamorphism UPGRADED BIOTITE CONCENTRATE K=6.46% AND 6.41% 5390 1 366 17 biotite conventional K-Ar B-3609 "4.742E-04, 0.558E-04*" 6.66 38.87 84 Hurley and others (1960) "K=5.49, 5.59, AND 5.56%" AVERAGE AGE OF THREE DETERMINATIONS IS 364 M.Y.--PROBABLE AGE OF INTRUSION 5390 2 377 17 biotite conventional K-Ar B-3609 "4.742E-04, 0.558E-04*" 6.66 40.22 94 Hurley and others (1960) "K=5.49, 5.59, AND 5.56%" AVERAGE AGE OF THREE DETERMINATIONS IS 364 M.Y.--PROBABLE AGE OF INTRUSION 5390 3 368.58 15 biotite conventional K-Ar B-3609 "4.742E-04, 0.558E-04*" 6.66 39.21 100 Hurley and others (1960) AVERAGE AGE OF THREE DETERMINATIONS IS 364 M.Y.--PROBABLE AGE OF INTRUSION 5391 1 358 10 biotite conventional K-Ar ME-10 "4.742E-04, 0.558E-04*" 8.45 48.21 96 Hurley and others (1960) age of intrusion 5392 1 383 10 whole rock conventional K-Ar R-3883 "4.742E-04, 0.558E-04*" 3.43 21.07 100 Hurley and others (1960) age of metamorphic crystallization K=2.84 AND 2.86% 5393 1 384 18 whole rock conventional K-Ar R-3447 "4.742E-04, 0.558E-04*" 3.21 19.75 97 Hurley and others (1960) age of metamorphic crystallization K=2.61% AND 2.71% 5394 1 376 15 whole rock conventional K-Ar R-3444 "4.742E-04, 0.558E-04*" 3.94 23.68 98 Hurley and others (1960) age of metamorphic crystallization K=3.29% AND 3.26% 5395 1 355 15 whole rock conventional K-Ar R-3448 "4.742E-04, 0.558E-04*" 3.1 17.52 88 Hurley and others (1960) minimum age of metamorphic crystallization K=2.57% AND 2.57% 5396 1 360 15 biotite conventional K-Ar B-3593 "4.742E-04, 0.558E-04*" 4.51 26.06 97 Hurley and others (1960) minimum age of intrusion 5397 1 372 10 biotite conventional K-Ar ME-9 "4.742E-04, 0.558E-04*" 5.39 32.1 83 Hurley and others (1960) age of intrusion 5397 2 372 10 biotite conventional K-Ar ME-9 "4.742E-04, 0.558E-04*" 4.83 28.8 68 Hurley and others (1960) age of intrusion 5398 1 7.36 0.1 adularia conventional K-Ar USGS(M)-7346-1 "4.72E-04, 0.585E-04, 1.19E-04*" 10.28 1.091 82 37% QUARTZ IMPURITY AGE OF MINERALIZATION 5398 2 7.22 0.1 adularia conventional K-Ar USGS(M)-7346-1 "4.72E-04, 0.585E-04, 1.19E-04*" 10.28 1.071 60 37% QUARTZ IMPURITY AGE OF MINERALIZATION 5399 1 7.94 0.1 adularia conventional K-Ar USGS(M)-RCD1B "4.72E-04, 0.585E-04, 1.19E-04*" 16.6 1.901 8090 40AR(RADIOGENIC)=1.885 AND 1.917XE-10MOL/GM AGE OF MINERALIZATION 5400 1 8.25 0.2 adularia conventional K-Ar USGS(M)-B270 "4.72E-04, 0.585E-04, 1.19E-04*" 15.83 1.884 7438 40AR(RADIOGENIC)=1.930 AND 1.838XE-10MOL/GM AGE OF MINERALIZATION 5401 1 8.86 0.4 hornblende conventional K-Ar USGS(M)-BH15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.924 0.1182 12 age of intrusion 1% PYROXENE IMPURITY 5401 2 8.97 0.2 biotite conventional K-Ar USGS(M)-BH15 "4.72E-04, 0.585E-04, 1.19E-04*" 6.97 0.9026 46 age of intrusion 5402 1 8.7 0.4 whole rock conventional K-Ar USGS(M)-S1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.63 0.3304 23 age of intrusion 5402 2 8.54 0.4 plagioclase conventional K-Ar USGS(M)-S1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.847 0.1044 16 age of intrusion 5402 3 9.09 0.4 plagioclase conventional K-Ar USGS(M)-S1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.709 0.093 1018 age of intrusion 40AR(RADIOGENIC)=0.0890 AND 0.0971XE-10MOL/GM 5403 1 8.57 0.2 hornblende conventional K-Ar USGS(M)-B271 "4.72E-04, 0.585E-04, 1.19E-04*" 0.739 0.0914 2027 2% CHLORITE AND 1% PLAGIOCLASE IMPURITIES 40AR(RADIOGENIC)=0.0900 AND 0.0928XE-10MOL/GM PRIMARY AGE MAY HAVE BEEN CHANGED BY ALTERATION SOLUTIONS 5403 2 8.67 0.3 plagioclase conventional K-Ar USGS(M)-B271 "4.72E-04, 0.585E-04, 1.19E-04*" 1.32 0.1651 1017 40AR(RADIOGENIC)=0.1602 AND 0.1701XE-10MOL/GM PRIMARY AGE MAY HAVE BEEN CHANGED BY ALTERATION SOLUTIONS 5404 1 8.46 0.2 whole rock conventional K-Ar USGS(M)-856-8 "4.72E-04, 0.585E-04, 1.19E-04*" 5.13 0.6262 42 AGE HAS BEEN REDUCED BY HYDROTHERMAL SOLUTIONS 5404 2 9.46 0.5 hornblende conventional K-Ar USGS(M)-856-8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.76 0.1038 20 age of intrusion 4% PYROXENE IMPURITY 5405 1 9.46 0.5 hornblende conventional K-Ar USGS(M)-BH17 "4.72E-04, 0.585E-04, 1.19E-04*" 0.822 0.1123 22 age of intrusion 5406 1 2.8 0.1 whole rock conventional K-Ar USGS(M)-7346-1 "4.72E-04, 0.585E-04, 1.19E-04*" 3.99 0.1608 51 age of volcanism 5407 1 8.99 0.2 biotite conventional K-Ar USGS(M)-BH32 "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 1.1 50 age of volcanism 5408 1 9.08 0.3 biotite conventional K-Ar USGS(M)-856-32 "4.72E-04, 0.585E-04, 1.19E-04*" 8.87 1.163 3076 age of volcanism 40AR(RADIOGENIC)=1.123 AND 1.204XE-10MOL/GM 5409 1 9.17 0.2 biotite conventional K-Ar USGS(M)-856-10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 1.084 59 age of volcanism 5409 2 9.22 0.2 hornblende conventional K-Ar USGS(M)-856-10 "4.72E-04, 0.585E-04, 1.19E-04*" 1.03 0.1371 35 age of volcanism 4% BIOTITE IMPURITY 5410 1 9.28 0.5 hornblende conventional K-Ar USGS(M)-BH26 "4.72E-04, 0.585E-04, 1.19E-04*" 0.863 0.1156 25 age of volcanism 5411 1 9.67 0.2 biotite conventional K-Ar USGS(M)-BH16 "4.72E-04, 0.585E-04, 1.19E-04*" 7.78 1.086 50 age of volcanism 2% IMPURITIES 5412 1 8.96 0.2 biotite conventional K-Ar USGS(M)-854-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.2 1.06 54 age of volcanism 5413 1 8.96 0.2 biotite conventional K-Ar USGS(M)-BH29 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 1.086 56 age of intrusion 5414 1 9.38 0.1 biotite conventional K-Ar USGS(M)-BM2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.97 1.079 5758 age of volcanism 1% IMPURITIES 40AR(RADIOGENIC)=1.082 AND 1.076XE-10MOL/GM 5415 1 9.51 0.3 whole rock conventional K-Ar USGS(M)-BH9 "4.72E-04, 0.585E-04, 1.19E-04*" 2.6 0.3571 64 age of volcanism 5416 1 9.73 0.2 hornblende conventional K-Ar USGS(M)-MTB1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.906 0.1272 48 age of volcanism 6% PYROXENE IMPURITY 5417 1 9.35 0.2 biotite conventional K-Ar USGS(M)-BH27 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 1.098 43 age of volcanism 1% IMPURITIES 5418 1 8.22 0.2 biotite conventional K-Ar USGS(M)-BH19A "4.72E-04, 0.585E-04, 1.19E-04*" 8.13 0.9647 47 age of volcanism 5419 1 5.89 0.2 biotite conventional K-Ar USGS(M)-BH6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.24 0.6999 24 age of intrusion 5420 1 5.34 0.3 biotite conventional K-Ar USGS(M)-BH20 "4.72E-04, 0.585E-04, 1.19E-04*" 7.08 0.5451 17 age of intrusion 1% HORNBLENDE IMPURITY 5420 2 5.55 0.6 hornblende conventional K-Ar USGS(M)-BH20 "4.72E-04, 0.585E-04, 1.19E-04*" 0.831 0.0665 9 age of intrusion 1% BIOTITE IMPURITY 5421 1 254 lepidolite conventional K-Ar O-S-F "4.72E-04, 0.577E-04" 10.48 age of intrusion K=8.70% AND 8.71%; 40AR/40K=0.0153 5425 1 396.44 12 biotite conventional K-Ar G-246 "4.72E-04, 0.585E-04, 1.19E-04*" 7.88 50.3 9691 minimum age of intrusion "%K=6.66, 6.43; 40AR(RAD)= 0.203, 0.198 PPM" 5426 1 426.35 15 biotite conventional K-Ar G-247 "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 52 9696 minimum age of intrusion "%K=6.16, 6.30; AR40(RAD)=0.203, 0.214 PPM" 5427 1 500 10 biotite 39Ar-40Ar total fusion 15 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE; SAMPLE YIELDS SADDLE SHAPED INCREMENTAL RELEASE PATTERN 5428 1 332 10 biotite 39Ar-40Ar total fusion 24 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM (ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE. 5428 2 352.75 8 biotite conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 8.925 50.06 80 INITIAL AGE COMPLETELY RESET BY METAMORPHIC EVENT AROUND 480 M.Y. AGO; PRESENT K-AR AGE IS APPARENTLY A COOLING AGE 5429 1 338 10 biotite 39Ar-40Ar total fusion 25 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETLY RESET BY EARLY PALEOZOIC METAMORPHIC EVENT(ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5430 1 368 10 hornblende 39Ar-40Ar total fusion 26 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHIC EVENT (ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5431 1 808 15 biotite 39Ar-40Ar total fusion 1 "4.72E-04, 0.585E-04, 1.19E-04" age of uplift and cooling 40-39 TOTAL-GAS AGE 5432 1 1003 20 hornblende 39Ar-40Ar total fusion 2 "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization 40-39 TOTAL-GAS AGE 5433 1 786 15 biotite 39Ar-40Ar total fusion 3 "4.72E-04, 0.585E-04, 1.19E-04" age of uplift and cooling 40-39 TOTAL-GAS AGE 5433 2 799.93 18 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.894 128.9 75 age of uplift and cooling 5434 1 758 15 biotite 39Ar-40Ar total fusion 4 "4.72E-04, 0.585E-04, 1.19E-04" age of uplift and cooling 40-39 TOTAL-GAS AGE 5435 1 956 20 hornblende 39Ar-40Ar total fusion 5 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization 40-39 TOTAL-GAS AGE 5436 1 795 15 biotite 39Ar-40Ar total fusion 6A "4.72E-04, 0.585E-04, 1.19E-04" age of uplift and cooling 0.18-0.25 MM GRAINI SIZE 40-39 TOTAL-GAS AGE 5436 2 796 15 biotite 39Ar-40Ar total fusion 6B "4.72E-04, 0.585E-04, 1.19E-04" age of uplift and cooling 0.15-0.18 MM GRAIN SIZE 40-39 TOTAL-GAS AGE 5436 3 787.54 16 biotite conventional K-Ar 6A "4.72E-04, 0.585E-04, 1.19E-04*" 8.195 116.5 87 age of uplift and cooling 0.18-0.25 MM GRAIN SIZE 5437 1 774 15 biotite 39Ar-40Ar total fusion 7 "4.72E-04, 0.585E-04, 1.19E-04" age of uplift and cooling 40-39 TOTAL-GAS AGE 5437 2 1059 20 hornblende 39Ar-40Ar total fusion 7 "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization 40-39 TOTAL-GAS AGE 5437 3 1047.03 24 hornblende conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 1.316 26.89 50 age of metamorphic crystallization 5438 1 705 15 biotite 39Ar-40Ar total fusion 8 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5439 1 739 15 biotite 39Ar-40Ar total fusion 9 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5439 2 997 20 hornblende 39Ar-40Ar total fusion 9 "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization 40-39 TOTAL-GAS AGE 5439 3 763.41 24 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.639 118.2 84 initial age disturbed by later metamorphism 5440 1 1001 20 hornblende 39Ar-40Ar total fusion 10 "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization 40-39 TOTAL-GAS AGE 5441 1 937 20 hornblende 39Ar-40Ar total fusion 11 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5442 1 675 15 biotite 39Ar-40Ar total fusion 12 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5442 2 687.92 15 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.974 108.2 79 initial age disturbed by later metamorphism 5443 1 636 15 biotite 39Ar-40Ar total fusion 13 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5443 2 1019 20 hornblende 39Ar-40Ar total fusion 13 "4.72E-04, 0.585E-04, 1.19E-04" age of metamorphic crystallization 40-39 TOTAL-GAS AGE 5444 1 893 20 hornblende 39Ar-40Ar total fusion 14 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5445 1 294 10 biotite 39Ar-40Ar total fusion 16 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM(ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5446 1 617 15 hornblende 39Ar-40Ar total fusion 17 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5447 1 827 20 hornblende 39Ar-40Ar total fusion 18 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5448 1 324 10 biotite 39Ar-40Ar total fusion 19 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM (ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5449 1 287 10 biotite 39Ar-40Ar total fusion 20 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM(ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5449 2 291.43 7 biotite conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 8.668 39.47 60 INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM(ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5450 1 608 15 hornblende 39Ar-40Ar total fusion 21 "4.72E-04, 0.585E-04, 1.19E-04" initial age disturbed by later metamorphism 40-39 TOTAL-GAS AGE 5450 2 618.83 14 hornblende conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 0.922 9.799 66 initial age disturbed by later metamorphism 5451 1 500 10 hornblende 39Ar-40Ar total fusion 22 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM(ABOUT 480 M.Y. AGO) 5452 1 421 10 hornblende 39Ar-40Ar total fusion 23 "4.72E-04, 0.585E-04, 1.19E-04" 40-39 TOTAL-GAS AGE INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM(ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5452 2 431.81 10 hornblende conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 1.301 9.138 65 INITIAL AGE COMPLETELY RESET BY EARLY PALEOZOIC METAMORPHISM(ABOUT 480 M.Y. AGO); PRESENT AGE IS APPARENTLY A COOLING AGE 5480 1 383.21 15 biotite conventional K-Ar L-47B "4.72E-04, 0.583E-04*" 9.26 56.92 9498 initial age disturbed by later metamorphism RADIOGENIC 40AR=0.227 AND 0.228 PPM "A K-AR AGE OF 375 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5481 1 371.74 15 muscovite conventional K-Ar L-48M "4.72E-04, 0.583E-04*" 10.23 60.8 95 minimum age of intrusion "A K-AR AGE OF 364 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5482 1 848.21 42 biotite conventional K-Ar L-46B "4.72E-04, 0.583E-04*" 8.89 138.6 97 age of metamorphic crystallization 5483 1 831.79 33 biotite conventional K-Ar L-42B "4.72E-04, 0.583E-04*" 9.11 138.6 93 age of metamorphic crystallization 5484 1 912.33 25 plagioclase conventional K-Ar L-207P "4.72E-04, 0.583E-04*" 5.73 97.95 9598 K=4.79% AND 4.73%; RADIOGENIC 40AR=0.389 AND 0.394 PPM AGE MAY BE TOO OLD 5485 1 805.26 32 biotite conventional K-Ar L-206B "4.72E-04, 0.583E-04*" 4.88 71.31 85 age of metamorphic crystallization 5486 1 820.22 32 biotite conventional K-Ar L-208B "4.72E-04, 0.583E-04*" 8.1 121.1 98 minimum age of intrusion 5487 1 837.8 33 biotite conventional K-Ar L-44B "4.72E-04, 0.583E-04*" 8.82 135.4 97 age of metamorphic crystallization 5488 1 367.06 14 biotite conventional K-Ar L-158B "4.72E-04, 0.583E-04*" 6.02 35.28 98 initial age disturbed by later metamorphism "A K-AR AGE OF 359 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5489 1 450.81 13 biotite conventional K-Ar L-202B "4.72E-04, 0.583E-04*" 6.94 51.17 9696 initial age disturbed by later metamorphism K=5.79% AND 5.74%; RADIOGENIC 40AR=0.199 AND 0.210 PPM "A K-AR AGE OF 440 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5490 1 296.53 9 K feldspar conventional K-Ar L-200F "4.72E-04, 0.583E-04*" 12.78 59.3 98 POTASSIUM DETERMINED BY ISOTOPE DILUTION LOW AGE MAY BE DUE TO LEAKAGE OF RADIOGENIC ARGON 5491 1 386.2 15 biotite conventional K-Ar L-199B "4.72E-04, 0.583E-04*" 4.6 28.52 92 initial age disturbed by later metamorphism "A K-AR AGE OF 376 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5492 1 357.02 14 phlogopite conventional K-Ar L-197P "4.72E-04, 0.583E-04*" 8.54 48.54 96 initial age disturbed by later metamorphism "A K-AR AGE OF 349 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5493 1 364.34 14 biotite conventional K-Ar L-440B "4.72E-04, 0.583E-04*" 9.34 54.29 68 initial age disturbed by later metamorphism K=7.89% AND 7.62% BY ISOTOPE DILUTION 5494 1 488.83 15 biotite conventional K-Ar L-446B "4.72E-04, 0.583E-04*" 8.76 70.81 9598 initial age disturbed by later metamorphism RADIOGENIC 40AR=0.282 AND 0.284 PPM 5494 2 462.39 14 hornblende conventional K-Ar L-446H "4.72E-04, 0.583E-04*" 4.32 32.78 97 initial age disturbed by later metamorphism POTASSIUM CONTENT SEEMS HIGH FOR HORNBLENDE; POTASSIUM DETERMINED BY ISOTOPE DILUTION 5495 1 386.31 11 biotite conventional K-Ar L-566B "4.72E-04, 0.583E-04*" 9.4 58.3 98 initial age disturbed by later metamorphism 5496 1 379.64 15 muscovite conventional K-Ar L-452M "4.72E-04, 0.583E-04*" 10.2 62.05 93 minimum age of intrusion "A K-AR AGE OF 371 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5497 1 869.86 34 biotite conventional K-Ar L-213B "4.72E-04, 0.583E-04*" 8.01 128.9 97 minimum age of intrusion 5498 1 818.86 32 biotite conventional K-Ar L-60B "4.72E-04, 0.583E-04*" 8.72 130.1 97 age of metamorphic crystallization 5499 1 809.07 32 biotite conventional K-Ar L-439B "4.72E-04, 0.583E-04*" 7.13 104.8 96 age of metamorphic crystallization K=5.83% AND 5.99% BY ISOTOPE DILUTION 5500 1 456.6 18 biotite conventional K-Ar L-422B "4.72E-04, 0.583E-04*" 8.93 66.8 92 initial age disturbed by later metamorphism 5501 1 699.69 28 biotite conventional K-Ar L-438B "4.72E-04, 0.583E-04*" 8.76 107.8 95 initial age disturbed by later metamorphism 5502 1 433.87 14 biotite conventional K-Ar L-437B "4.72E-04, 0.583E-04*" 8.61 60.8 8896 initial age disturbed by later metamorphism RADIOGENIC 40AR=0.241 AND 0.245 PPM 5503 1 388.93 11 muscovite conventional K-Ar L-443M "4.72E-04, 0.583E-04*" 9.93 62.05 84 initial age disturbed by later metamorphism 5504 1 414.67 12 biotite conventional K-Ar L-445B "4.72E-04, 0.583E-04*" 9.58 64.3 96 initial age disturbed by later metamorphism 5505 1 440.37 13 biotite conventional K-Ar L-489B "4.72E-04, 0.583E-04*" 8.85 63.55 99 minimum age of intrusion 5506 1 860.52 34 biotite conventional K-Ar L-40B "4.72E-04, 0.583E-04*" 8.97 142.4 98 minimum age of intrusion 5507 1 876.85 35 biotite conventional K-Ar L-450B "4.72E-04, 0.583E-04*" 5.71 92.82 96 age of metamorphic crystallization 5508 1 366.44 14 biotite conventional K-Ar L-49B "4.72E-04, 0.583E-04*" 9.58 56.04 93 initial age disturbed by later metamorphism 5509 1 751.59 22 biotite conventional K-Ar L-436B "4.72E-04, 0.583E-04*" 8.91 119.6 95 initial age disturbed by later metamorphism 5510 1 741.93 22 biotite conventional K-Ar L-434B "4.72E-04, 0.583E-04*" 8.84 116.8 94 initial age disturbed by later metamorphism 5511 1 849.98 34 biotite conventional K-Ar L-43B "4.72E-04, 0.583E-04*" 8.79 137.4 97 minimum age of intrusion 5512 1 794.24 24 biotite conventional K-Ar L-442B "4.72E-04, 0.583E-04*" 9.3 133.6 96 initial age disturbed by later metamorphism 5513 1 398.28 15 biotite conventional K-Ar L-421B "4.72E-04, 0.583E-04*" 9.32 59.8 93 initial age disturbed by later metamorphism K=7.53% AND 7.95% BY ISOTOPE DILUTION 5514 1 362.93 11 biotite conventional K-Ar L-444B "4.72E-04, 0.583E-04*" 9.38 54.29 9592 initial age disturbed by later metamorphism DUPLICATE ARGON DETERMINATION 5515 1 775.14 24 biotite conventional K-Ar L-234B "4.72E-04, 0.583E-04*" 6.91 96.33 9994 minimum age of intrusion RADIOGENIC 40AR=0.388 AND 0.382 PPM 5516 1 359.46 14 phlogopite conventional K-Ar L-196P "4.72E-04, 0.583E-04*" 9 51.54 96 initial age disturbed by later metamorphism POTASSIUM DETERMINED BY ISOTOPE DILUTION "A K-AR AGE OF 325 M.Y. REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606). POTASSIUM REDETERMINED FOR ABOVE CALCULATED AGE" 5517 1 377.66 15 biotite conventional K-Ar L-451B "4.72E-04, 0.583E-04*" 9.35 56.55 93 minimum age of intrusion "A K-AR AGE OF 368 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5518 1 409.13 16 biotite conventional K-Ar L-453B "4.72E-04, 0.583E-04*" 8.06 53.29 92 initial age disturbed by later metamorphism "A K-AR AGE OF 400 M.Y. WAS REPORTED FOR THIS SAME SAMPLE BY LONG AND KULP (GSA, V. 69, 1958, P. 603-606)" 5519 1 359.65 14 muscovite conventional K-Ar L-205M "4.72E-04, 0.583E-04*" 9.3 53.29 95 initial age disturbed by later metamorphism 5520 1 829.61 25 biotite conventional K-Ar L-542B "4.72E-04, 0.583E-04*" 8.83 133.9 89 age of metamorphic crystallization POTASSIUM DETERMINED BY ISOTOPE DILUTION 5521 1 1874.18 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.21 436.8 100 initial age disturbed by later metamorphism HIGH PURITY MINERAL SEPARATE 5521 2 1955 hornblende conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.912 46.32 99 age of later metamorphism HIGH PURITY MINERAL SEPARATE 5522 1 1627.2 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 9.01 342.7 99 "age of later metamorphism, initial age disturbed by later metamorphism" HIGH PURITY MINERAL SEPARATE 5522 2 1730.3 hornblende conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.55 64.79 99 initial age disturbed by later metamorphism HIGH PURITY MINERAL SEPARATE 5523 1 1787.63 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 376.1 100 initial age disturbed by later metamorphism HIGH PURITY MINERAL SEPARATE 5524 1 2062.35 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.57 475.6 98 initial age disturbed by later metamorphism HIGH PURITY MINERAL SEPARATE THERE MAY BE EXCESS RADIOGENIC ARGON-40 PRESENT 5525 1 2415.07 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.81 643.9 99 HIGH PURITY MINERAL SEPARATE THE AGE MAY BE THE RESULT OF EXCESS RADIOGENIC AR-40 IN THE BIOTITE 5526 1 2415.52 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 639 99 HIGH PURITY MINERAL SEPARATE BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5526 2 2034.59 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 1.51 81.92 99 initial age disturbed by later metamorphism HIGH PURITY MINERAL SEPARATE 5527 1 2562.78 biotite conventional K-Ar 7A "4.72E-04, 0.585E-04, 1.19E-04*" 7.47 609.1 99 BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5527 2 1907.12 hornblende conventional K-Ar 7A "4.72E-04, 0.585E-04, 1.19E-04*" 1.63 79.51 99 "age of later metamorphism, initial age disturbed by later metamorphism" 5528 1 2764.75 biotite conventional K-Ar 7B "4.72E-04, 0.585E-04, 1.19E-04*" 5.31 500.6 99 HORNBLENDE AND CHLORITE ALSO PRESENT IN BIOTITE CONCENTRATE BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5528 2 1881.12 hornblende conventional K-Ar 7B "4.72E-04, 0.585E-04, 1.19E-04*" 1.17 55.82 99 age of later metamorphism 5529 1 2535.2 biotite conventional K-Ar 7C "4.72E-04, 0.585E-04, 1.19E-04*" 7.65 611.3 100 BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5529 2 1855.62 100 hornblende conventional K-Ar 7C "4.72E-04, 0.585E-04, 1.19E-04*" 1.54 71.88 98 age of later metamorphism 5530 1 2824.89 biotite conventional K-Ar 7D "4.72E-04, 0.585E-04, 1.19E-04*" 5.58 548.8 99 HORNBLENDE AND CHLORITE PRESENT IN THE BIOTITE CONCENTRATE BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5530 2 2279.61 hornblende conventional K-Ar 7D "4.72E-04, 0.585E-04, 1.19E-04*" 0.819 53.99 98 initial age disturbed by later metamorphism 5531 1 2723.1 biotite conventional K-Ar 7E "4.72E-04, 0.585E-04, 1.19E-04*" 7.97 729.5 100 BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5531 2 2043.15 hornblende conventional K-Ar 7E "4.72E-04, 0.585E-04, 1.19E-04*" 1.31 71.57 96 age of later metamorphism 5532 1 2815.66 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 7.84 766.1 99 HIGH PURITY MINERAL SEPARATE BIOTITE AGE IS OLDER THAN HORNBLENDE AGE BECAUSE OF EXCESS RADIOGENIC ARGON IN THE BIOTITE 5532 2 1879.94 hornblende conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 1.334 63.58 99 "age of later metamorphism, initial age disturbed by later metamorphism" HIGH PURITY MINERAL SEPARATE 5533 1 2977.07 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.92 974.9 99 "sample contains excess radiogenic argon, age is too old" HIGH PURITY MINERAL SEPARATE 5534 1 3228.06 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 1054 99 "sample contains excess radiogenic argon, age is too old" HIGH PURITY MINERAL SEPARATE 5534 2 3181.85 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 1022 100 "sample contains excess radiogenic argon, age is too old" HIGH PURITY MINERAL SEPARATE 5535 1 1864.38 hornblende conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 1.353 63.63 98 "age of later metamorphism, initial age disturbed by later metamorphism" HIGH PURITY MINERAL SEPARATE 5536 1 1723.03 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 9.95 413.2 99 initial age disturbed by later metamorphism HIGH PURITY MINERAL SEPARATE 5537 1 1415.96 30 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.18E-04*" 7.58 234.7 95 minimum age of intrusion PURITY GREATER THAN 99% 5538 1 1607.34 30 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.18E-04*" 8.33 311 99 "age of later metamorphism, initial age disturbed by later metamorphism" PURITY GREATER THAN 99% 5539 1 1352.55 150 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.18E-04*" 8.37 242.7 98 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5540 1 1657.46 35 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.18E-04*" 8.28 323.9 100 age of intrusion PURITY GREATER THAN 99% 5541 1 1602.23 30 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.18E-04*" 8.79 326.6 88 "age of later metamorphism, initial age disturbed by later metamorphism" 5541 2 1619.7 30 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.18E-04*" 8.79 332 81 "age of later metamorphism, initial age disturbed by later metamorphism" 5541 3 1683.88 35 muscovite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.18E-04*" 8.93 357.9 98 initial age disturbed by later metamorphism 5542 1 1500 30 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.18E-04*" 7.77 261.5 99 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5544 1 1662.32 35 muscovite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.18E-04*" 9.63 378.4 96 age of later metamorphism PURITY GREATER THAN 99% 5545 1 1720.43 35 biotite conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.18E-04*" 8.25 341.8 99 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5546 1 1522.14 30 biotite conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.18E-04*" 7.43 255.7 97 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5547 1 1612.04 30 muscovite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.18E-04*" 9.28 348 99 "age of later metamorphism, initial age disturbed by later metamorphism" PURITY GREATER THAN 99% 5548 1 1555.16 30 biotite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.18E-04*" 7.36 261.5 88 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5549 1 1728.6 35 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.18E-04*" 7.89 329.3 99 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5550 1 1686.37 35 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.18E-04*" 8.83 354.7 85 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5551 1 1787.63 35 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.18E-04*" 8.55 376.1 100 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5552 1 3181.85 65 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.18E-04*" 8.14 1022 100 age of metamorphic crystallization PURITY GREATER THAN 99% 5552 2 3228.06 65 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.18E-04*" 8.14 1054 100 age of metamorphic crystallization PURITY GREATER THAN 99% 5553 1 2597.61 50 biotite conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.18E-04*" 8.28 692.5 99 PURITY GREATER THAN 99% THIS AGE MAY BE A PRIMARY METAMORPHIC AGE OR REDUCED AGE 5554 1 1557.83 30 biotite conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.18E-04*" 8.13 289.6 100 "age of later metamorphism, initial age disturbed by later metamorphism" PURITY GREATER THAN 99% 5555 1 2111.36 40 biotite conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.18E-04*" 7.52 434.2 100 initial age disturbed by later metamorphism PURITY GREATER THAN 99% 5556 1 2413.27 50 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.18E-04*" 8.13 593.4 99 PURITY GREATER THAN 99% THIS AGE MAY BE A PRIMARY METAMORPHIC AGE OR A REDUCED AGE 5556 2 2386.16 50 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.18E-04*" 8.13 581.4 100 PURITY GREATER THAN 99% THIS AGE MAY BE A PRIMARY METAMORPHIC AGE OR A REDUCED AGE 5557 1 177.04 4 muscovite conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.18E-04*" 9.63 25.79 92 initial age disturbed by later metamorphism PURITY GREATER THAN 99% AGE PROBABLY DISTURBED BY INTRUSION OF BOULDER BATHOLITH 5558 1 76.39 2 biotite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.18E-04*" 7.94 8.92 87 initial age disturbed by later metamorphism PURITY GREATER THAN 99% AGE PROBABLY DISTURBED BY INTRUSION OF BOULDER BATHOLITH 5560 1 76.47 2 biotite conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.18E-04*" 7.3 8.21 87 age of intrusion PURITY GREATER THAN 99% 5561 1 53.7 2 biotite conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.18E-04*" 8.13 6.38 29 age meaning uncertain (geologic factors) PURITY GREATER THAN 99% AGE MAY REPRESENT A LATE PHASE OF INTRUSION OF THE TOBACCO ROOT BATHOLITH 5565 1 305.77 12 biotite conventional K-Ar BRE-1 "4.72E-04, 0.584E-04, 1.19E-04*" 6.46 30.99 96 initial age disturbed by later metamorphism COOLING AGE 5566 1 317.29 11 biotite conventional K-Ar BRE-2 "4.72E-04, 0.584E-04, 1.19E-04*" 8.9 44.45 96 initial age disturbed by later metamorphism COOLING AGE 5567 1 300.64 11 biotite conventional K-Ar BRE-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.1 33.44 96 initial age disturbed by later metamorphism COOLING AGE 5568 1 283.67 10 whole rock conventional K-Ar BRE-4 "4.72E-04, 0.584E-04, 1.19E-04*" 4.78 21.14 96 initial age disturbed by later metamorphism 5569 1 324.31 11 whole rock conventional K-Ar BRE-5 "4.72E-04, 0.584E-04, 1.19E-04*" 3.13 16.01 92 initial age disturbed by later metamorphism 5570 1 312.96 10 biotite conventional K-Ar BRE-6 "4.72E-04, 0.584E-04, 1.19E-04*" 6.76 33.26 96 initial age disturbed by later metamorphism COOLING AGE 5570 2 302.51 10 muscovite conventional K-Ar BRE-6 "4.72E-04, 0.584E-04, 1.19E-04*" 5.15 24.42 94 initial age disturbed by later metamorphism IMPURE MUSCOVITE(?)--COMPILER COOLING AGE 5571 1 319.52 12 biotite conventional K-Ar BRE-7 "4.72E-04, 0.584E-04, 1.19E-04*" 7.36 37.04 97 initial age disturbed by later metamorphism COOLING AGE 5571 2 345.07 11 muscovite conventional K-Ar BRE-7 "4.72E-04, 0.584E-04, 1.19E-04*" 5.37 29.4 95 "minimum age of metamorphic crystallization, initial age disturbed by later metamorphism" IMPURE MUSCOVITE(?)--COMPILER COOLING AGE 5572 1 300.07 11 biotite conventional K-Ar BRE-8 "4.72E-04, 0.584E-04, 1.19E-04*" 7.57 35.58 96 initial age disturbed by later metamorphism COOLING AGE 5572 2 316.2 10 muscovite conventional K-Ar BRE-8 "4.72E-04, 0.584E-04, 1.19E-04*" 8.62 42.89 97 initial age disturbed by later metamorphism COOLING AGE 5573 1 324.13 11 biotite conventional K-Ar BRE-9 "4.72E-04, 0.584E-04, 1.19E-04*" 7.05 36.04 97 initial age disturbed by later metamorphism COOLING AGE 5573 2 323.27 11 muscovite conventional K-Ar BRE-9 "4.72E-04, 0.584E-04, 1.19E-04*" 9.27 47.25 97 initial age disturbed by later metamorphism COOLING AGE 5574 1 314.27 10 biotite conventional K-Ar BRE-10 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 43 98 initial age disturbed by later metamorphism COOLING AGE 5575 1 409.51 14 biotite conventional K-Ar MRN-1 "4.72E-04, 0.584E-04, 1.19E-04*" 5.82 38.52 97 initial age disturbed by later metamorphism COOLING AGE; ALSO MINIMUM AGE FOR SECOND PERIOD OF METAMORPHISM 5575 2 318.79 11 muscovite conventional K-Ar MRN-1 "4.72E-04, 0.584E-04, 1.19E-04*" 5.45 27.36 97 initial age disturbed by later metamorphism COOLING AGE 5576 1 406.89 15 biotite conventional K-Ar MRN-2 "4.72E-04, 0.584E-04, 1.19E-04*" 6.18 40.61 97 initial age disturbed by later metamorphism COOLING AGE; ALSO MINIMUM AGE FOR SECOND PERIOD OF METAMORPHISM 5577 1 259.51 8 biotite conventional K-Ar MRN-3 "4.72E-04, 0.584E-04, 1.19E-04*" 4.94 19.85 88 initial age disturbed by later metamorphism COOLING AGE 5577 2 293.99 9 muscovite conventional K-Ar MRN-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.42 34.11 98 initial age disturbed by later metamorphism COOLING AGE 5578 1 320.73 10 muscovite conventional K-Ar MRN-4 "4.72E-04, 0.584E-04, 1.19E-04*" 9.74 49.22 98 initial age disturbed by later metamorphism COOLING AGE 5579 1 296.86 10 muscovite conventional K-Ar MRN-5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 36.05 97 initial age disturbed by later metamorphism COOLING AGE 5580 1 335.96 12 muscovite conventional K-Ar MRN-6 "4.72E-04, 0.584E-04, 1.19E-04*" 4.93 26.21 97 initial age disturbed by later metamorphism IMPURE MUSCOVITE COOLING AGE 5581 1 397.59 17 hornblende conventional K-Ar MRN-7 "4.72E-04, 0.584E-04, 1.19E-04*" 0.52 3.33 90 initial age disturbed by later metamorphism COOLING AGE; ALSO MINIMUM AGE FOR SECOND PERIOD OF METAMORPHISM 5582 1 297.01 10 biotite conventional K-Ar MRN-8 "4.72E-04, 0.584E-04, 1.19E-04*" 5.6 26.03 96 initial age disturbed by later metamorphism COOLING AGE 5583 1 324.57 11 biotite conventional K-Ar MRN-9 "4.72E-04, 0.584E-04, 1.19E-04*" 5.77 29.54 97 initial age disturbed by later metamorphism COOLING AGE 5583 2 332.48 13 muscovite conventional K-Ar MRN-9 "4.72E-04, 0.584E-04, 1.19E-04*" 1.64 8.62 91 initial age disturbed by later metamorphism IMPURE MUSCOVITE COOLING AGE 5584 1 1082.43 21 biotite conventional K-Ar LNR-1 "4.72E-04, 0.584E-04, 1.19E-04*" 3.12 66.62 98 LOW POTASSIUM CONTENT SUGGESTS IMPURE BIOTITE AGE IS ANOMOLOUSLY OLD 5584 2 1075.7 20 biotite conventional K-Ar LNR-1 "4.72E-04, 0.584E-04, 1.19E-04*" 3.12 66.07 97 LOW POTASSIUM CONTENT SUGGESTS IMPURE BIOTITE AGE IS ANOMOLOUSLY OLD 5585 1 336.67 12 biotite conventional K-Ar LNR-2 "4.72E-04, 0.584E-04, 1.19E-04*" 6.51 34.69 94 initial age disturbed by later metamorphism COOLING AGE 5586 1 396.24 14 biotite conventional K-Ar LNR-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.98 50.91 98 initial age disturbed by later metamorphism COOLING AGE; ALSO MINIMUM AGE FOR SECOND PERIOD OF METAMORPHISM 5587 1 355.07 11 biotite conventional K-Ar LNR-4 "4.72E-04, 0.584E-04, 1.19E-04*" 4.71 26.61 95 initial age disturbed by later metamorphism COOLING AGE 5587 2 316 10 muscovite conventional K-Ar LNR-4 "4.72E-04, 0.584E-04, 1.19E-04*" 9 44.75 95 initial age disturbed by later metamorphism COOLING AGE 5588 1 329.42 12 biotite conventional K-Ar LNR-5 "4.72E-04, 0.584E-04, 1.19E-04*" 3.15 16.39 95 initial age disturbed by later metamorphism LOW POTASSIUM CONTENT SUGGESTS IMPURE BIOTITE COOLING AGE 5589 1 258.8 9 biotite conventional K-Ar LNR-6 "4.72E-04, 0.584E-04, 1.19E-04*" 6.19 24.8 93 initial age disturbed by later metamorphism COOLING AGE 5589 2 299.83 10 muscovite conventional K-Ar LNR-6 "4.72E-04, 0.584E-04, 1.19E-04*" 4.77 22.4 95 initial age disturbed by later metamorphism IMPURE MUSCOVITE COOLING AGE 5590 1 309.41 10 biotite conventional K-Ar LNR-7 "4.72E-04, 0.584E-04, 1.19E-04*" 7.18 34.89 97 initial age disturbed by later metamorphism COOLING AGE 5590 2 293.28 9 muscovite conventional K-Ar LNR-7 "4.72E-04, 0.584E-04, 1.19E-04*" 6.65 30.49 98 initial age disturbed by later metamorphism COOLING AGE 5591 1 295.09 10 muscovite conventional K-Ar LNR-8 "4.72E-04, 0.584E-04, 1.19E-04*" 6.4 29.54 97 initial age disturbed by later metamorphism COOLING AGE 5592 1 251.13 8 muscovite conventional K-Ar LNR-9 "4.72E-04, 0.584E-04, 1.19E-04*" 5.8 22.5 93 initial age disturbed by later metamorphism COOLING AGE 5593 1 361.9 12 biotite conventional K-Ar PMT-1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.29 42.06 97 initial age disturbed by later metamorphism COOLING AGE 5594 1 473.75 15 hornblende conventional K-Ar PMT-2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.35 2.73 86 APPROXIMATE AGE OF SECOND PERIOD OF METAMORPHISM 5595 1 354.25 12 biotite conventional K-Ar PMT-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.46 42.04 96 initial age disturbed by later metamorphism COOLING AGE 5595 2 351.52 12 muscovite conventional K-Ar PMT-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.03 39.28 97 initial age disturbed by later metamorphism COOLING AGE 5596 1 325.6 10 biotite conventional K-Ar PMT-4 "4.72E-04, 0.584E-04, 1.19E-04*" 6.63 34.06 93 initial age disturbed by later metamorphism COOLING AGE 5596 2 335.09 11 muscovite conventional K-Ar PTM-4 "4.72E-04, 0.584E-04, 1.19E-04*" 6.77 35.89 96 initial age disturbed by later metamorphism COOLING AGE 5597 1 291.47 10 biotite conventional K-Ar PMT-5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.1 36.89 94 initial age disturbed by later metamorphism COOLING AGE 5597 2 310.75 13 muscovite conventional K-Ar PMT-5 "4.72E-04, 0.584E-04, 1.19E-04*" 9.77 47.7 98 initial age disturbed by later metamorphism COOLING AGE 5598 1 248.05 9 biotite conventional K-Ar PMT-6 "4.72E-04, 0.584E-04, 1.19E-04*" 6.7 25.65 89 initial age disturbed by later metamorphism COOLING AGE 5598 2 231.8 8 muscovite conventional K-Ar PMT-6 "4.72E-04, 0.584E-04, 1.19E-04*" 7.36 26.21 95 initial age disturbed by later metamorphism COOLING AGE 5599 1 293.08 10 biotite conventional K-Ar PMT-7 "4.72E-04, 0.584E-04, 1.19E-04*" 5.95 27.26 92 initial age disturbed by later metamorphism COOLING AGE 5599 2 293.28 10 muscovite conventional K-Ar PMT-7 "4.72E-04, 0.584E-04, 1.19E-04*" 9.83 45.07 98 initial age disturbed by later metamorphism COOLING AGE 5600 1 298 11 biotite conventional K-Ar PMT-8 "4.72E-04, 0.584E-04, 1.19E-04*" 6.77 31.61 95 initial age disturbed by later metamorphism COOLING AGE 5600 2 222.24 9 muscovite conventional K-Ar PMT-8 "4.72E-04, 0.584E-04, 1.19E-04*" 7.16 24.38 94 initial age disturbed by later metamorphism COOLING AGE 5601 1 340.81 11 biotite conventional K-Ar PMT-9 "4.72E-04, 0.584E-04, 1.19E-04*" 6.19 33.43 96 initial age disturbed by later metamorphism COOLING AGE 5601 2 306.81 10 muscovite conventional K-Ar PMT-9 "4.72E-04, 0.584E-04, 1.19E-04*" 3.62 17.43 94 initial age disturbed by later metamorphism IMPURE MUSCOVITE COOLING AGE 5622 1 362.52 7 biotite conventional K-Ar WELL NO. 7 "4.72E-04, 0.585E-04, 1.19E-04*" 4.939 28.55 95 minimum age of intrusion RED-BROWN BIOTITE 5622 2 358.03 7 biotite conventional K-Ar WELL NO. 7 "4.72E-04, 0.585E-04, 1.19E-04*" 4.939 28.16 95 minimum age of intrusion RED-BROWN BIOTITE 5623 1 261.46 5 muscovite conventional K-Ar WELL NO. 3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.478 26.24 91 PROBABLY A COOLING AGE 5623 2 254.49 5 muscovite conventional K-Ar WELL NO. 3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.478 25.49 90 PROBABLY A COOLING AGE 5624 1 391.33 8 hornblende conventional K-Ar WELL NO. 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4161 2.618 87 HORNBLENDE IS ALTERED PROBABLY A COOLING AGE 5624 2 389.99 8 hornblende conventional K-Ar WELL NO. 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4161 2.608 82 HORNBLENDE IS ALTERED PROBABLY A COOLING AGE 5678 1 340.94 17 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.68 52.3 97 0.5 -2 MM GRAIN SIZE A COOLING AGE 5679 1 353.92 17 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 46.5 98 0.5 -2 MM GRAIN SIZE A COOLING AGE 5680 1 441.98 22 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.46 61 97 5 MM GRAIN SIZE POSSIBLY A MINIMUM AGE FOR TIME OF MINERALIZATION 5681 1 473.35 24 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 6.07 47.3 98 5 MM GRAIN SIZE POSSIBLE TIME OF MINERALIZATION 5682 1 1137.61 56 hornblende conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.124 2.83 90 2 CM LONG THIS AGE APPEARS TO BE TOO OLD; PROBABLY EXCESS ARGON PRESENT 5683 1 329.26 biotite conventional K-Ar M-51 "4.72E-04, 0.585E-04, 1.19E-04*" 9.48 49.3 initial age disturbed by later metamorphism A COOLNG AGE 5685 1 678.49 biotite conventional K-Ar G-19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 104 initial age disturbed by later metamorphism 5690 1 349.6 muscovite conventional K-Ar K-78M "4.72E-04, 0.584E-04, 1.19E-04*" 8.25 45.82 initial age disturbed by later metamorphism PROBABLY A COOLING AGE 5691 1 364.64 biotite conventional K-Ar K-84B "4.72E-04, 0.584E-04, 1.19E-04*" 8.62 50.15 initial age disturbed by later metamorphism PROBABLY A COOLING AGE 5692 1 388.36 biotite conventional K-Ar K-86B "4.72E-04, 0.584E-04, 1.19E-04*" 7.71 48.1 initial age disturbed by later metamorphism PROBABLY A COOLING AGE 5693 1 378.33 biotite conventional K-Ar K-11B "4.72E-04, 0.584E-04, 1.19E-04*" 8.15 49.39 initial age disturbed by later metamorphism PROBABLY A COOLING AGE 5694 1 311.86 biotite conventional K-Ar K-23B "4.72E-04, 0.584E-04, 1.19E-04*" 8.1 39.7 initial age disturbed by later metamorphism PROBABLY A COOLING AGE 5695 1 242.21 biotite conventional K-Ar K-101B "4.72E-04, 0.584E-04, 1.19E-04*" 9.03 33.7 minimum age of intrusion INITIAL AGE MAY HAVE BEEN DISTURBED BY LATER METAMORPHISM--COMPILER 5696 1 263.49 biotite conventional K-Ar K-106B "4.72E-04, 0.584E-04, 1.19E-04*" 7.1 29 minimum age of intrusion INITIAL AGE MAY HAVE BEEN DISTURBED BY LATER METAMORPHISM--COMPILER 5718 1 421 15 hornblende 39Ar-40Ar total fusion DA-B36-73 "4.72E-04, 0.585E-04, 1.19E-04" "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE; TWO SIGMA ERROR 5718 2 343 15 biotite DA-B36-73 "4.72E-04, 0.585E-04, 1.19E-04" "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE; TWO SIGMA ERROR CONVENTIONAL K-AR AGE IS 352 M.Y. 5718 3 361.21 10 biotite conventional K-Ar DA-B36-73 "4.72E-04, 0.585E-04, 1.19E-04*" 9.471 54.53 83 "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE IS 343 M.Y. 5719 1 343 15 biotite 39Ar-40Ar total fusion DA-B37-73 "4.72E-04, 0.585E-04, 1.19E-04" "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE; TWO SIGMA ERROR 5720 1 415 15 hornblende 39Ar-40Ar total fusion DA-B40-73 "4.72E-04, 0.585E-04, 1.19E-04" "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE; TWO SIGMA ERROR CONVENTIONAL K-AR AGE IS 419 M.Y. 5720 2 427.22 12 hornblende conventional K-Ar DA-B40-73 "4.72E-04, 0.585E-04, 1.19E-04*" 1.915 13.29 43 "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE IS 415 M.Y. 5720 3 350 15 biotite 39Ar-40Ar total fusion DA-B40-73 "4.72E-04, 0.585E-04, 1.19E-04" "age of uplift and cooling, initial age disturbed by later metamorphism" 40-39AR TOTAL GAS AGE; TWO SIGMA ERROR 5774 1 414.32 16 biotite conventional K-Ar L-58B "4.72E-04, 0.583E-04*" 8.32 55.79 96 initial age disturbed by later metamorphism 5775 1 362.12 14 muscovite conventional K-Ar L-59 "4.72E-04, 0.583E-04*" 9.49 54.79 96 minimum age of intrusion 5825 1 63.76 1.2 muscovite conventional K-Ar 1. YU-PZ(A346) "4.72E-04, 0.585E-04, 1.19E-04*" 10 9.343 83 minimum age of intrusion K=8.29% AND 8.32% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 35, ENTRY NO. 14" 5826 1 67.45 2 muscovite conventional K-Ar 2. G-M1416(A384) "4.72E-04, 0.585E-04, 1.19E-04*" 9.834 9.73 7074 age of intrusion 99% PURE K=8.130% AND 8.197%; 40AR(RAD)=0.0374 AND 0.0404 PPM "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 34, ENTRY NO. 13" 5827 1 68.55 1.3 muscovite conventional K-Ar 3. YU-PZ(A56) "4.72E-04, 0.585E-04, 1.19E-04*" 10.15 10.21 79 age of intrusion "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 34, ENTRY NO. 12" 5828 1 28.29 0.5 whole rock conventional K-Ar 4. YU-PZ(A326) "4.72E-04, 0.585E-04, 1.19E-04*" 3.24 1.33 68 K=2.71% AND 2.67% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 30, ENTRY NO. 8. ARMSTRONG BELIEVES INITIAL AGE IS MUCH OLDER THAN K-AR AGE" 5828 2 26.39 0.5 whole rock conventional K-Ar 4. YU-PZ(A326) "4.72E-04, 0.585E-04, 1.19E-04*" 3.24 1.24 67 AGE MAY BE TOO YOUNG; ROCK INTENSELY ALTERED 5829 1 17.15 4.3 whole rock conventional K-Ar 5. YU-PZ(A350) "4.72E-04, 0.585E-04, 1.19E-04*" 0.532 0.132 4 minimum age of volcanism K=0.437% AND 0.446% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 7" 5829 2 13.14 5.3 whole rock conventional K-Ar 5. YU-PZ(A350) "4.72E-04, 0.585E-04, 1.19E-04*" 0.532 0.101 2 K=0.437% AND 0.446% AGE IS TOO YOUNG 5829 3 13.4 5.2 whole rock conventional K-Ar 5. YU-PZ(A350) "4.72E-04, 0.585E-04, 1.19E-04*" 0.532 0.103 2 K=0.437% AND 0.446% AGE IS TOO YOUNG 5830 1 19.71 0.3 biotite conventional K-Ar 6. YU-PZ(A34) "4.72E-04, 0.585E-04, 1.19E-04*" 7.29 2.08 61 K=6.06% AND 6.04% "AGE IS APPARENTLY TOO OLD IN COMPARISON TO OTHER K-AR AGES ON SAME RHYOLITE UNIT. SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 6" 5830 2 17.73 0.5 biotite conventional K-Ar 6. YU-PZ(A34) "4.72E-04, 0.585E-04, 1.19E-04*" 7.29 1.87 40 K=6.06% AND 6.04% AGE IS APPARENTLY TOO OLD IN COMPARISON TO OTHER K-AR AGES ON SAME RHYOLITE UNIT 5830 3 17.73 0.3 biotite conventional K-Ar 6. YU-PZ(A34) "4.72E-04, 0.585E-04, 1.19E-04*" 7.29 1.87 52 K=6.06% AND 6.04% AGE IS APPARENTLY TOO OLD IN COMPARISON TO OTHER K-AR AGES ON SAME RHYOLITE UNIT 5831 1 15.34 0.3 whole rock conventional K-Ar 7. YU-PZ(A45) "4.72E-04, 0.585E-04, 1.19E-04*" 4.87 1.08 87 minimum age of volcanism "LISTED 3.89 AND 3.87% K SHOULD BE 4.09% AND 3.99% K (COMPILER--SEE ARMSTRONG, 1975)" "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 5" 5831 2 17.32 0.3 whole rock 7. YU-PZ(A45) "4.72E-04, 0.585E-04, 1.19E-04*" 4.67 1.17 65 maximum age of volcanism K=3.89% AND 3.87% 5832 1 15.99 0.3 whole rock conventional K-Ar 8. YU-PZ(A26) "4.72E-04, 0.585E-04, 1.19E-04*" 4.67 1.08 81 age of volcanism K=3.89% AND 3.87% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 3" 5832 2 16.14 0.3 whole rock conventional K-Ar 8. YU-PZ(A26) "4.72E-04, 0.585E-04, 1.19E-04*" 4.67 1.09 89 age of volcanism K=3.89% AND 3.87% 5833 1 16.1 0.3 biotite conventional K-Ar 9. YU-PZ(A345) "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 1.9 61 age of volcanism K=6.73% AND 6.81% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 2" 5833 2 16.35 0.3 biotite conventional K-Ar 9. YU-PZ(A345) "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 1.93 61 age of volcanism K=6.73% AND 6.81% 5834 1 15.96 0.3 sanidine conventional K-Ar 10. YU-PZ(A98) "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 2.04 84 age of volcanism K=7.32 AND 7.36% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 2" 5835 1 16.16 0.3 sanidine conventional K-Ar 11. YU-PZ(A325) "4.72E-04, 0.585E-04, 1.19E-04*" 5.05 1.18 63 age of volcanism K=4.21% AND 4.18% "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 1" 5836 1 15.56 0.3 adularia conventional K-Ar 12. YU-PZ(A43) "4.72E-04, 0.585E-04, 1.19E-04*" 15.11 3.4 61 K=12.48% AND 12.61% "AGE OF MINERALIZATION. SAMPLE LISTED BY ARMSTRONG, 1975, NO. 14, P. 9, ENTRY NO. 9" 5836 2 15.56 0.3 adularia conventional K-Ar 12. YU-PZ(A43) "4.72E-04, 0.585E-04, 1.19E-04*" 15.11 3.4 73 K=12.48% AND 12.61% AGE OF MINERALIZATION 5837 1 15.26 0.6 adularia conventional K-Ar 13. G-F1415(A383) "4.72E-04, 0.585E-04, 1.19E-04*" 13.6 3 5869 "K=11.269, 11.323%; 40AR(RAD)=0.0119 AND 0.0121 PPM" "AGE OF MINERALIZATION; SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 9, ENTRY NO. 8" 5838 1 0.53 0.5 whole rock conventional K-Ar 69-52L "4.72E-04, 0.584E-04, 1.19E-04*" 0.762 0.0059 0 age of volcanism "K=0.628 AND 0.637%; 40AR(RAD)=0.0103 AND 0.0159XE-6 CC/GM; ANALYTICAL DATA FROM ARMSTRONG (1975, ISOCHRON/WEST)" 5839 1 0.55 0.08 whole rock conventional K-Ar 69-53L "4.72E-04, 0.584E-04, 1.19E-04*" 0.61 0.0048 54 age of volcanism "K=0.511 AND 0.502%; 40AR(RAD)=0.0110 AND 0.0107XE-6 CC/GM; ANALYTICAL DATA FROM ARMSTRONG (1975, ISOCHRON/WEST)" 5840 1 0.85 0.5 whole rock conventional K-Ar 69-39L "4.72E-04, 0.584E-04, 1.19E-04*" 0.616 0.0075 11 age of volcanism "K=0.516 AND 0.506%; 40AR(RAD)=0.0153 AND 0.0185XE-6 CC/GM; ANALYTICAL DATA FROM ARMSTRONG (1975, ISOCHRON/WEST)" 5841 1 1.74 0.4 whole rock conventional K-Ar 70-7L "4.72E-04, 0.584E-04, 1.19E-04*" 0.92 0.023 14 age of volcanism "K=0.770 AND 0.758%; 40AR(RAD)=0.0487 AND 0.0543XE-6 CC/GM; ANALYTICAL DATA FROM ARMSTRONG (1975, ISOCHRON/WEST)" 5842 1 2.57 0.05 whole rock conventional K-Ar 69-61L "4.72E-04, 0.584E-04, 1.19E-04*" 2.42 0.0897 3138 "K=2.03 AND 2.00%; 40AR(RAD)=0.204 AND 0.199XE-6 CC/GM; ANALYTICAL DATA FROM ARMSTRONG (1975, ISOCHRON/WEST)" "AGE IS ANOMALOUSLY OLD, PERHAPS DUE TO EXCESS RADIOGENIC ARGON" 5843 1 0.56 0.04 Unk conventional K-Ar 21(A) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 5844 1 11.6 1.4 glass conventional K-Ar A no decay constants given minimum age of volcanism NO ANALYTICAL DATA GIVEN 5845 1 whole rock R13 no decay constants given 0.67 "3 DETERMINATIONS OF ARGON-40 WERE INCONCLUSIVE. SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 44) FOR K VALUE" ROCK THOUGHT TO BE LESS THAN 1.0 M.Y. OLD 5846 1 whole rock R12 no decay constants given 0.51 "3 DETERMINATIONS OF ARGON-40 WERE INCONCLUSIVE. SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 45) FOR K VALUE" ROCK THOUGHT TO BE LESS THAN 1.2 M.Y. OLD 5847 1 whole rock R11 no decay constants given 0.71 "3 DETERMINATIONS OF ARGON-40 WERE INCONCLUSIVE. SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 46) FOR K VALUE" ROCK THOUGHT TO BE LESS THAN 1.5 M.Y. OLD 5848 1 3.6 0.2 whole rock conventional K-Ar R6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.0446 5 maximum age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 47) FOR ANALYTICAL DATA" ARMSTRONG AND OTHERS (1975) OBTAINED 0.30 M.Y. FOR THE SAME UNIT 5849 1 0.92 0.8 whole rock conventional K-Ar R14 "4.72E-04, 0.585E-04, 1.19E-04*" 3.35 0.0446 3 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 48) FOR ANALYTICAL DATA" 5850 1 1.09 0.4 whole rock conventional K-Ar R9 "4.72E-04, 0.585E-04, 1.19E-04*" 4.45 0.0696 8 maximum age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 49) FOR ANALYTICAL DATA" ARMSTRONG AND OTHERS (1975) OBTAINED 0.6 M.Y. FOR THIS SAME UNIT 5851 1 1.15 0.6 whole rock conventional K-Ar R4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.81 0.0134 4 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 50) FOR ANALYTICAL DATA" 5852 1 1.8 0.8 whole rock conventional K-Ar R3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.0223 5 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 51) FOR ANALYTICAL DATA" 5853 1 2.3 0.7 whole rock conventional K-Ar R2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.66 0.0223 4 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 52) FOR ANALYTICAL DATA" 5854 1 2.87 0.6 whole rock conventional K-Ar R1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.67 0.0277 6 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 20, NO. 53) FOR ANALYTICAL DATA" 5855 1 3.8 0.4 whole rock conventional K-Ar R7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.57 0.0312 6 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 21, NO. 54) FOR ANALYTICAL DATA" ARMSTRONG AND OTHERS (1975) OBTAINED AN AGE OF 1.9 M.Y. FOR THE SAME UNIT; THE AGE DISCORDANCY IS NOT UNDERSTOOD 5856 1 3.6 0.7 whole rock conventional K-Ar R8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.0446 3 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 21, NO. 55) FOR ANALYTICAL DATA" 5857 1 5.58 0.8 whole rock conventional K-Ar R5 "4.72E-04, 0.585E-04, 1.19E-04*" 1.33 0.107 9 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 21, NO. 56) FOR ANALYTICAL DATA" 5858 1 8.14 6 whole rock conventional K-Ar R10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.52 0.0611 3 "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 21, NO. 57) FOR ANALYTICAL DATA" AGE IS PROBABLY MUCH TOO YOUNG 5859 1 9.38 1.5 whole rock conventional K-Ar R18 "4.72E-04, 0.585E-04, 1.19E-04*" 4.32 0.585 26 minimum age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 21, NO. 58) FOR ANALYTICAL DATA" 5860 1 16 5 whole rock conventional K-Ar R19 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4 0.0937 6 age not evaluated "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 21, NO. 59) FOR ANALYTICAL DATA" 5861 1 33.38 2 whole rock conventional K-Ar R16 "4.72E-04, 0.585E-04, 1.19E-04*" 1.6 0.776 20 age of volcanism "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 26, NO. 4) FOR ANALYTICAL DATA" 5862 1 26.95 15 whole rock conventional K-Ar R15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.33 0.129 3 age not evaluated "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 26, NO. 5) FOR ANALYTICAL DATA" 5863 1 75.48 6 whole rock conventional K-Ar R17 "4.72E-04, 0.585E-04, 1.19E-04*" 0.41 0.455 14 "SEE ARMSTRONG (ISOCHRON/WEST, 1975, NO. 14, P. 50, NO. 1) FOR ANALYTICAL DATA" THERE IS CONSIDERABLE QUESTION ABOUT THE MEANING OF THIS AGE; IT IS POSSIBLY TOO OLD 5864 1 3.15 0.8 whole rock conventional K-Ar UO-106 "4.72E-04, 0.585E-04, 1.19E-04*" 1.08 0.049 7 AGE THOUGHT ANOMALOUSLY YOUNG BY GRAY AND KITTLEMAN (1967) BUT IS BELIEVED CORRECT ACCORDING TO DORT (1967) AND ARMSTRONG (1975) 5865 1 99.33 2 plagioclase conventional K-Ar UO-107 "4.72E-04, 0.585E-04, 1.19E-04*" 1.51 2.22 74 AGE IS TOO OLD; CONTAMINATION SUSPECTED 5866 1 25.47 4 whole rock conventional K-Ar UO-108 "4.72E-04, 0.585E-04, 1.19E-04*" 0.65 0.24 272522 40AR VALUE IS AVERAGE OF 3 DETERMINATIONS AGE MAY BE TOO OLD 5867 1 13.8 0.5 glass conventional K-Ar UO-109 I "4.72E-04, 0.585E-04, 1.19E-04*" 6.87 1.37 AGE MAY BE LOW 5867 2 24.18 0.8 plagioclase conventional K-Ar UO-109 II "4.72E-04, 0.585E-04, 1.19E-04*" 2.28 0.799 42 "MIXTURE OF ALBITE (60%), ANDESINE (27%), AND MICROCRYSTALLINE SILICA (13%)" AGE MAY BE TOO OLD; CONTAMINATION OF THE FELDSPAR IS SUSPECTED 5868 1 21.76 0.6 whole rock conventional K-Ar UO-110 "4.72E-04, 0.585E-04, 1.19E-04*" 0.92 0.29 54 age of volcanism 5869 1 20.03 0.5 whole rock conventional K-Ar UO-111 I "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.29 46 age of volcanism (ISOTOPE INC. ANALYSIS) 5869 2 23.46 2 whole rock conventional K-Ar UO-111 II "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.34 352524 ARGON-40 VALUE IS AVERAGE OF 3 ANALYSES (RICE UNIV. ANALYSES) AGE THOUGHT TO BE TOO OLD 5870 1 20.1 0.6 whole rock conventional K-Ar UO-112 "4.72E-04, 0.585E-04, 1.19E-04*" 1.67 0.486 63 age of volcanism 5871 1 14.22 0.3 whole rock conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.46 0.3 78 age of volcanism 5871 2 15.16 0.3 whole rock conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.46 0.32 55 age of volcanism 5872 1 15.91 0.3 whole rock conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 1.43 0.329 79 age of volcanism 5873 1 49.05 1.4 whole rock conventional K-Ar CWF 129X "4.72E-04, 0.584E-04, 1.19E-04*" 4.4 3.15 374648 age of volcanism "K=3.65 AND 3.65%; 40AR(RAD)=7.39, 7.13, AND 6.67XE-6 CC/GM" "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 23, ENTRY NO. 1)" 5874 1 47.26 1.4 whole rock conventional K-Ar TALBR3LT "4.72E-04, 0.584E-04, 1.19E-04*" 2.06 1.42 83 age of volcanism K=1.72 AND 1.70% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 23, ENTRY NO. 2)" 5875 1 42.56 1.2 whole rock conventional K-Ar TALBR3DRK "4.72E-04, 0.584E-04, 1.19E-04*" 2.29 1.42 68 age of volcanism K=1.89 AND 1.92% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 23, ENTRY NO. 2)" 5876 1 46.42 1.3 biotite conventional K-Ar WT268 "4.72E-04, 0.584E-04, 1.19E-04*" 8.47 5.734 66 age of intrusion K=7.00 AND 7.06% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 29, ENTRY NO. 24)" 5876 2 51.1 1.5 hornblende conventional K-Ar WT268 "4.72E-04, 0.584E-04, 1.19E-04*" 1.12 0.8357 18 age of intrusion K=0.905 AND 0.956% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 29, ENTRY NO. 24)" 5877 1 51.91 3 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.94 6.02 85 age of intrusion "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 27, ENTRY NO. 7)" 5877 2 52.29 1.5 hornblende conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.864 0.66 76 age of intrusion 5878 1 51.4 1.5 hornblende conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.758 0.569 70 age of intrusion "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 27, ENTRY NO. 6)" 5879 1 74.97 2 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.13 8.96 94 "PRIMARY AGE MAY BE ABOUT 100 M.Y. THIS SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 35, ENTRY NO. 18)" 5880 1 58.05 1.6 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 9.16 7.78 92 "A REDUCED AGE; PRIMARY AGE MAY BE ABOUT 100 M.Y. SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, P. 50, ENTRY NO. 8)" 5881 1 95.2 3.8 hornblende conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04" 0.51 0.516 64 minimum age of intrusion (*) "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 35, ENTRY NO. 19)" 5881 2 77.5 2.2 muscovite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04" 8.59 6.24 89 (*) APPARENTLY A REDUCED AGE 5881 3 69.44 2.1 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.26 7.4 92 APPARENTLY A REDUCED AGE 5882 1 880.2 25 hornblende conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 0.802 13.1 98 minimum age of intrusion "SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 6, ENTRY NO. 2)" 5883 1 488.26 15 hornblende conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 1.24 10.01 98 "A REDUCED AGE. SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 6, ENTRY NO. 3)" 5884 1 70.01 2.7 biotite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 8.3 8.53 78 "A REDUCED AGE; SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 16)" 5885 1 94.64 3.5 biotite conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 5.14 7.19 89 "A REDUCED AGE; SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 17)" 5886 1 39.39 1.2 whole rock conventional K-Ar HJO-5-65 "4.76E-04, 0.589E-04, 1.18E-04*" 4.46 2.557 86 minimum age of intrusion K=3.69% AND 3.71% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 30, ENTRY NO. 7)" 5887 1 49.18 1.4 biotite conventional K-Ar HJO-1-65 "4.76E-04, 0.589E-04, 1.18E-04*" 8.62 6.187 86 age of intrusion K=7.15% AND 7.16% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 29, ENTRY NO. 19)" 5888 1 44.97 1.3 biotite conventional K-Ar HJO-2-65 "4.76E-04, 0.589E-04, 1.18E-04*" 8.64 5.664 92 age of intrusion K=7.17% AND 7.17% "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 29, ENTRY NO. 20)" 5889 1 45.83 1.3 biotite conventional K-Ar HJO-6-65 "4.76E-04, 0.589E-04, 1.18E-04*" 7.79 5.206 71 K=6.46% AND 6.47% "THIS IS APPARENTLY A REDUCED AGE. SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 50, ENTRY NO. 7)" 5890 1 41 1.8 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion (NO ANALYTICAL DATA GIVEN) "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 29, ENTRY NO. 18)" 5891 1 172 8 hornblende conventional K-Ar (NOT GIVEN) no decay constants given minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN "SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 19)" 5892 1 300 orthoclase conventional K-Ar (NOT GIVEN) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN "SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 34)" 5893 1 669 25 hornblende conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN "QUESTIONABLE AGE AS EXCESS ARGON MAY BE PRESENT. SAMPLE LISTED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 35)" 5894 1 50.2 3 biotite conventional K-Ar (NOT GIVEN) no decay constants given* 4.98 3.65 72 age of intrusion "SAMPLE LISTED BY ARMSTRONG (1975, ISOCHRON/WEST, NO. 14, P. 29, ENTRY NO. 21)" 5894 2 47.17 3 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given* 5.9 4.06 53 minimum age of intrusion 5973 1 204.13 4 biotite conventional K-Ar YU-1-161 "4.72E-04, 0.584E-04, 1.19E-04*" 6.18 19.23 88 age of intrusion "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 35, ENTRY NO. 15" 5974 1 122.83 2.4 biotite conventional K-Ar YU-SS-60-A "4.72E-04, 0.584E-04, 1.19E-04*" 8 14.64 9491 age of intrusion K=6.64% AND 6.64%; 40AR(RAD)=32.9 AND 32.7XE-6 CC/GM "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO.14, P. 35, ENTRY NO. 16" 5975 1 87.88 3 muscovite conventional K-Ar USGS(D)-D2215 "4.72E-04, 0.585E-04, 1.19E-04*" 9.88 12.81 88 K2O=9.95% AND 9.81% AGE OF MINERALIZATION 5975 2 88.9 3 biotite conventional K-Ar USGS(D)-D2215 "4.72E-04, 0.585E-04, 1.19E-04*" 9.535 12.51 87 K2O= 9.56 AND 9.51% AGE OF MINERALIZATION 5976 1 44.1 1.4 biotite conventional K-Ar 758A "4.72E-04, 0.585E-04, 1.19E-04*" 8.715 5.601 70 initial age disturbed by later metamorphism K2O=8.710% AND 8.720% "THIS SAMPLE LISTED BY ARMSTRONG, 1975, NO. 14, P. 50, ENTRY NO. 10" 5977 1 1781.06 53 biotite conventional K-Ar 2096 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 345.5 97 K2O=7.90% AND 7.90% AGE APPEARS TO BE TOO OLD; EXCESS ARGON MAY BE PRESENT 5978 1 58.45 1.7 muscovite conventional K-Ar 2127 "4.72E-04, 0.585E-04, 1.19E-04*" 9.35 7.997 8 age meaning uncertain (analysis questionable) K2O=9.36% AND 9.34% 5978 2 78.24 2.6 biotite conventional K-Ar 2127 "4.72E-04, 0.585E-04, 1.19E-04*" 8.73 10.05 66 initial age disturbed by later metamorphism K2O=8.70% AND 8.76% 5979 1 62.4 2.1 biotite conventional K-Ar 912 "4.72E-04, 0.585E-04, 1.19E-04*" 8.56 7.825 77 initial age disturbed by later metamorphism 5980 1 47.57 1.6 biotite conventional K-Ar 971 "4.72E-04, 0.585E-04, 1.19E-04*" 8.71 6.045 89 initial age disturbed by later metamorphism 5981 1 16.63 0.5 adularia conventional K-Ar 10. DRS-23-69 "4.72E-04, 0.585E-04, 1.19E-04*" 15.78 3.795 81 AGE OF MINERALIZATION 5982 1 0.53 0.5 whole rock conventional K-Ar 1. YU-69-52L "4.72E-04, 0.584E-04, 1.19E-04*" 0.762 0.0059 0 age of volcanism K=0.628% AND 0.637%; 40AR(RAD)=0.0103 AND 0.0159XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 5983 1 0.55 0.08 whole rock conventional K-Ar 2. YU-69-53L "4.72E-04, 0.584E-04, 1.19E-04*" 0.61 0.0048 54 age of volcanism K=0.511% AND 0.502%; 40AR(RAD)=0.0110 AND 0.0107XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 5984 1 0.85 0.5 whole rock conventional K-Ar 3. YU-69-39L "4.72E-04, 0.584E-04, 1.19E-04*" 0.616 0.0075 11 age of volcanism K=0.516% AND 0.506%; 40AR(RAD)=0.0153 AND 0.0185XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5985 1 1.21 0.2 whole rock conventional K-Ar 4. YU-70-8L "4.72E-04, 0.584E-04, 1.19E-04*" 0.864 0.0151 73 age of volcanism K=0.715 AND 0.721%; 40AR(RAD)=0.0367 AND 0.0311XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5986 1 1.23 0.2 whole rock conventional K-Ar 5. YU-59P271HP "4.72E-04, 0.584E-04, 1.19E-04*" 0.703 0.0125 54 age of volcanism K=0.587% AND 0.580%; 40AR(RAD)=0.0313 AND 0.0246XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5987 1 1.4 0.07 whole rock conventional K-Ar 6. YU-69-59L "4.72E-04, 0.584E-04, 1.19E-04*" 0.826 0.0167 1613 age of volcanism K=0.686 AND 0.686%; 40AR(RAD)=0.0392 AND 0.0357XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5988 1 1.54 0.3 whole rock conventional K-Ar 7. YU-70-4L "4.72E-04, 0.584E-04, 1.19E-04*" 0.601 0.0133 24 age of volcanism K=0.501 AND 0.497%; 40AR(RAD)=0.0250 AND 0.0345XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5989 1 1.74 0.4 whole rock conventional K-Ar 8. YU-70-7L "4.72E-04, 0.584E-04, 1.19E-04*" 0.92 0.023 14 age of volcanism K=0.770 AND 0.758%; 40AR(RAD)=0.0487 AND 0.0543XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5990 1 1.84 0.2 whole rock conventional K-Ar 9. YU-70-13L "4.72E-04, 0.584E-04, 1.19E-04*" 0.363 0.0096 466 age of volcanism "K=0.296 AND 0.307%; 40AR(RAD)=0.0231, 0.0233, AND 0.0189XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5991 1 2.57 0.05 whole rock conventional K-Ar 10. YU-69-61L "4.72E-04, 0.584E-04, 1.19E-04*" 2.42 0.0897 3138 K=2.03 AND 2.00%; 40AR(RAD)=0.204 AND 0.199XE-6 CC/GM "AGE IS ANOMALOUSLY OLD, PERHAPS DUE TO EXCESS RADIOGENIC ARGON" 5992 1 2.92 0.2 whole rock conventional K-Ar 11. YU-69-60L "4.72E-04, 0.584E-04, 1.19E-04*" 2.73 0.115 985 "K=2.27 AND 2.26%; 40AR(RAD)=0.261, 0.246, 0.266XE-6 CC/GM" "AGE IS ANOMALOUSLY OLD, PERHAPS DUE TO EXCESS RADIOGENIC ARGON" 5993 1 3.86 0.1 whole rock conventional K-Ar 12. YU-59P79HP "4.72E-04, 0.584E-04, 1.19E-04*" 3.61 0.201 2526 K=3.00 AND 2.99%; 40AR(RAD)=0.447 AND 0.456XE-6 CC/GM "AGE IS ANOMALOUSLY OLD, PERHAPS DUE TO EXCESS RADIOGENIC ARGON" 5994 1 3.09 0.06 K feldspar conventional K-Ar 13. YU-69-40L "4.72E-04, 0.584E-04, 1.19E-04*" 8.68 0.386 58 age of volcanism K=7.21 AND 7.20% "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5994 2 3.22 0.06 K feldspar conventional K-Ar 13. YU-69-40L "4.72E-04, 0.584E-04, 1.19E-04*" 9.76 0.453 58 age of volcanism K= 8.08 AND 8.13% "SEE ARMSTRONG AND OTHERS (1975, AJC, P. 225-251) FOR FURTHER AGE EVALUATION" 5995 1 4.37 0.4 whole rock conventional K-Ar 14. YU-69-51L "4.72E-04, 0.584E-04, 1.19E-04*" 0.611 0.0385 118 age of volcanism K=0.505 AND 0.510%; 40AR(RAD)=0.080 AND 0.092XE-6 CC/GM "AGE IS THOUGHT TO BE 4.4 M.Y.; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 5995 2 5.16 1.3 whole rock conventional K-Ar 14. YU-69-51L "4.72E-04, 0.584E-04, 1.19E-04*" 0.631 0.0469 33 age of volcanism K=0.524 AND 0.523%; 40AR(RAD)=0.126 AND 0.0842XE-6 CC/GM "AGE IS THOUGHT TO BE 4.4 M.Y.; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5996 1 4.48 0.6 whole rock conventional K-Ar 15. YU-70-44L "4.72E-04, 0.584E-04, 1.19E-04*" 0.512 0.0331 55 age of volcanism K=0.426 AND 0.424%; 40AR(RAD)=0.0712 AND 0.0772XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5997 1 4.63 0.3 whole rock conventional K-Ar 16. YU-69-42L "4.72E-04, 0.584E-04, 1.19E-04*" 0.481 0.0321 1111 age of volcanism K=0.398 AND 0.401%; 40AR(RAD)=0.0739 AND 0.0698XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5998 1 5.1 0.6 whole rock conventional K-Ar 17. YU-69-47L "4.72E-04, 0.584E-04, 1.19E-04*" 0.23 0.0169 866 age of volcanism "K=0.197 AND 0.186%; 40AR(RAD)=0.0342, 0.0467, AND 0.0327XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 5999 1 6.06 1 whole rock conventional K-Ar 18. YU-70-16L "4.72E-04, 0.584E-04, 1.19E-04*" 0.595 0.052 45 age of volcanism "K=0.496, 0.492, AND 0.494%; 40AR(RAD)=0.121 AND 0.112XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6000 1 6.31 0.7 whole rock conventional K-Ar 19. YU-69-55L "4.72E-04, 0.584E-04, 1.19E-04*" 0.364 0.0331 75 age of volcanism K=0.303% AND 0.301%; 40AR(RAD)=0.0800 AND 0.0684XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6001 1 5.71 0.2 whole rock conventional K-Ar 20. YU-69-45L "4.72E-04, 0.584E-04, 1.19E-04*" 4.85 0.399 2018 age of volcanism K=4.05% AND 4.00%; 40AR(RAD)=0.886 AND 0.902XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6001 2 5.84 0.3 whole rock conventional K-Ar 20. YU-69-45L "4.72E-04, 0.584E-04, 1.19E-04*" 4.73 0.398 18 age of volcanism K=3.94% AND 3.92% 6001 3 6.18 0.2 feldspar conventional K-Ar 20. YU-69-45L "4.72E-04, 0.584E-04, 1.19E-04*" 1.83 0.163 31 age of volcanism K=1.52% AND 1.51% 6001 4 5.95 0.11 whole rock conventional K-Ar 20. YU-69-45L "4.72E-04, 0.584E-04, 1.19E-04*" 4.73 0.406 3340 age of volcanism "K=3.84%, 3.98%, AND 3.96%; 40AR(RAD)=0.924 AND 0.896XE-6 CC/GM" 6001 5 6.7 0.16 feldspar conventional K-Ar 20. YU-69-45L "4.72E-04, 0.584E-04, 1.19E-04*" 1.72 0.166 41 age of volcanism K=1.41% AND 1.44% 6002 1 7.48 0.3 whole rock conventional K-Ar 21. YU-62P111HP "4.72E-04, 0.584E-04, 1.19E-04*" 0.28 0.0302 1712 age of volcanism K=0.233% AND 0.232%; 40AR(RAD)=0.0676 AND 0.0677XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6003 1 8.38 0.7 whole rock conventional K-Ar 22. YU-70-3L "4.72E-04, 0.584E-04, 1.19E-04*" 0.604 0.073 88 age of volcanism K=0.509% AND 0.493; 40AR(RAD)=0.175 AND 0.152XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6004 1 8.82 0.5 whole rock conventional K-Ar 23. YU-69-50L "4.72E-04, 0.584E-04, 1.19E-04*" 0.382 0.0486 1510 age of volcanism K=0.320% AND 0.314%; 40AR(RAD)=0.109 AND 0.109XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6005 1 9.93 0.16 whole rock conventional K-Ar 24. YU-69-43L "4.72E-04, 0.584E-04, 1.19E-04*" 5.01 0.718 6440 age of volcanism K=4.16% AND 4.16%; 40AR(RAD)=1.61 AND 1.62XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6005 2 9.78 0.14 whole rock conventional K-Ar 24. YU-69-43L "4.72E-04, 0.584E-04, 1.19E-04*" 5.26 0.743 7470 age of volcanism K=4.40% AND 4.33%; 40AR(RAD)=1.64 AND 1.69XE-6 CC/GM 6006 1 13.84 1.5 whole rock conventional K-Ar 25. YU-70-11L "4.72E-04, 0.584E-04, 1.19E-04*" 0.357 0.0714 56 age of volcanism K=0.302% AND 0.290%; 40AR(RAD)=0.167 AND 0.153XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6007 1 2.62 0.3 whole rock conventional K-Ar 4. YU-70-10L "4.72E-04, 0.584E-04, 1.19E-04*" 0.614 0.0232 764 "K=0.506% AND 0.513%; 40AR(RAD)=0.0606, 0.0477, 0.0447XE-6 CC/GM" "AGE MAY BE TOO YOUNG; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 6008 1 3.22 2 whole rock conventional K-Ar 5. YU-OB9HP "4.72E-04, 0.584E-04, 1.19E-04*" 0.576 0.0267 21 K=0.478% AND 0.478%; 40AR(RAD)=0.0707 AND 0.0490XE-6 CC/GM "AGE MAY BE TOO YOUNG; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6009 1 3.65 0.6 whole rock conventional K-Ar 6. YU-59P318HP "4.72E-04, 0.584E-04, 1.19E-04*" 0.786 0.0413 53 "K=0.647, 0.657, AND 0.654%; 40AR(RAD)=0.113 AND 0.072XE-6 CC/GM" "AGE MAY BE TOO YOUNG; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6010 1 4.16 0.3 whole rock conventional K-Ar 7. YU-54P93HP "4.72E-04, 0.584E-04, 1.19E-04*" 0.696 0.0417 88 K=0.581% AND 0.575%; 40AR(RAD)=0.080 AND 0.107XE-6 CC/GM "AGE MAY BE TOO YOUNG; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6011 1 -0.02 0.05 whole rock conventional K-Ar 1. YU-69-27L "4.72E-04, 0.584E-04, 1.19E-04" 1.74 K=1.44% AND 1.47%; 40AR(RAD)=0.0013 AND -0.0028XE-6 CC/GM "A NEGATIVE AGE, AGE IS THOUGHT TO BE ABOUT 0.02 M.Y.; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 6011 2 0.07 0.09 whole rock conventional K-Ar 1. YU-69-27L "4.72E-04, 0.584E-04, 1.19E-04" K=3.82% AND 3.76%; 40AR(RAD)=0.0117 AND 0.0096XE-6 CC/GM "AGE IS THOUGHT TO BE ABOUT 0.02 M.Y.; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 6012 1 -0.09 0.2 whole rock conventional K-Ar 2. YU-69-22L "4.72E-04, 0.584E-04, 1.19E-04*" 1.46 -0.0019 K=1.22% AND 1.21%; 40AR(RAD)=0.0015 AND -0.0099XE-6 CC/GM "A NEGATIVE AGE; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6013 1 -0.09 0.1 whole rock conventional K-Ar 2. YU-70-28L "4.72E-04, 0.584E-04, 1.19E-04*" 4.57 -0.0063 K=3.72% AND 3.87%; 40AR(RAD)=-0.009 AND -0.019XE-6 CC/GM "A NEGATIVE AGE; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6014 1 0.04 0.02 whole rock conventional K-Ar 4. YU-70-27L "4.72E-04, 0.584E-04, 1.19E-04*" 4.61 0.0029 12 age of volcanism K=3.87% AND 3.79%; 40AR(RAD)=0.004 AND 0.009XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6015 1 0.09 0.04 feldspar conventional K-Ar 5. YU-70-26L "4.72E-04, 0.584E-04, 1.19E-04*" 4.97 0.0061 age of volcanism "K=4.21% AND 4.04%; 40AR(RAD)=0.020, 0.025, 0.003, AND 0.007XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6016 1 0.07 0.14 whole rock conventional K-Ar 6. YU-69M9M "4.72E-04, 0.584E-04, 1.19E-04*" 0.687 0.0006 0 age of volcanism K=0.569% AND 0.571%; 40AR(RAD)=-0.0005 AND 0.0034XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6017 1 0.11 0.03 whole rock conventional K-Ar 7. YU-900O "4.72E-04, 0.584E-04, 1.19E-04*" 0.847 0.0013 1 age of volcanism K=0.700% AND 0.706%; 40AR(RAD) VALUE IS AVERAGE OF 13 ANALYSES "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6018 1 0.09 0.3 whole rock conventional K-Ar 8. YU-902O "4.72E-04, 0.584E-04, 1.19E-04*" 0.996 0.0013 age of volcanism K=0.826% AND 0.827%; 40AR(RAD) VALUE IS THE AVERAGE OF 3 ANALYSES "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6019 1 0.12 0.4 whole rock conventional K-Ar 9. YU-903O "4.72E-04, 0.584E-04, 1.19E-04*" 1.052 0.0018 0 age of volcanism K=0.871% AND 0.875% "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6020 1 0.11 0.2 whole rock conventional K-Ar 10. YU-69-13L "4.72E-04, 0.584E-04, 1.19E-04*" 0.74 0.0012 0 age of volcanism K=0.612% AND 0.616%; 40AR(RAD)=0.0005 AND 0.0049XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6021 1 0.14 0.06 whole rock conventional K-Ar 11. YU-69-2L "4.72E-04, 0.584E-04, 1.19E-04*" 0.977 0.0019 40 age of volcanism "K=0.835%, 0.810%, AND 0.789%; 40AR(RAD)=0.0072 AND 0.0015XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6021 2 0.15 0.04 whole rock conventional K-Ar 11. YU-69-2L "4.72E-04, 0.584E-04, 1.19E-04*" 1.035 0.0022 32 age of volcanism "K=0.857%, 0.889%, AND 0.832%; 40AR(RAD)=0.0047 AND 0.0051XE-6 CC/GM" 6022 1 0.31 0.02 whole rock conventional K-Ar 12. YU-70-38L "4.72E-04, 0.584E-04, 1.19E-04*" 4.69 0.0209 910 age of volcanism K=3.87% AND 3.92%; 40AR(RAD)=0.0404 AND 0.0535XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6023 1 0.43 0.1 whole rock conventional K-Ar 13. YU-62P73HP "4.72E-04, 0.584E-04, 1.19E-04*" 0.55 0.0034 52 age of volcanism K=0.455% AND 0.458%; 40AR(RAD)=0.0098 AND 0.0056XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6024 1 0.57 0.1 whole rock conventional K-Ar 14. YU-70-36L "4.72E-04, 0.584E-04, 1.19E-04*" 5.13 0.0424 55 age of volcanism K=4.29% AND 4.23%; 40AR(RAD)=0.092 AND 0.102XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6025 1 0.97 0.2 whole rock conventional K-Ar 15. YU-69-3L "4.72E-04, 0.584E-04, 1.19E-04*" 2.05 0.0286 32 age of volcanism K=1.70% AND 1.71%; 40AR(RAD)=0.0712 AND 0.0572XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6026 1 0.83 0.1 whole rock conventional K-Ar 16. YU-69-8L "4.72E-04, 0.584E-04, 1.19E-04*" 0.736 0.0088 74 age of volcanism "K=0.605%, 0.619%, AND 0.608%; 40AR(RAD)=0.0237 AND 0.0155XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6027 1 0.97 0.05 K feldspar conventional K-Ar 17. YU-69-51 "4.72E-04, 0.584E-04, 1.19E-04*" 9.3 0.13 541 age of volcanism "K=7.76%, 7.70%, AND 7.69%; 40AR(RAD)=0.294 AND 0.290XE-6 CC/GM" "TUFF THOUGHT TO BE 1.03 M.Y. OLD; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FUTHER AGE EVALUATION" 6027 2 1.13 0.04 K feldspar conventional K-Ar 17. YU-69-5L "4.72E-04, 0.584E-04, 1.19E-04*" 5.24 0.085 1826 age of volcanism K=4.26% AND 4.44%; 40AR(RAD)=0.198 AND 0.183XE-6 CC/GM TUFF THOUGHT TO BE 1.03 M.Y. OLD 6028 1 2.03 1.2 whole rock conventional K-Ar 18. YU-70-35L "4.72E-04, 0.584E-04, 1.19E-04*" 0.469 0.0137 12 age of volcanism K=0.388% AND 0.390%; 40AR(RAD)=0.0207 AND 0.0409XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6029 1 2.44 0.3 whole rock conventional K-Ar 19. YU-928A "4.72E-04, 0.584E-04, 1.19E-04*" 0.407 0.0143 65 age of volcanism K=0.343% AND 0.333%; 40AR(RAD)=0.027 AND 0.037XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6030 1 3.77 0.1 whole rock conventional K-Ar 20. YU-69-6L "4.72E-04, 0.584E-04, 1.19E-04*" 1.171 0.0636 2920 age of volcanism K=0.979% AND 0.987%; 40AR(RAD)=0.140 AND 0.145XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6031 1 4.21 0.13 whole rock conventional K-Ar 21. YU-69-9L "4.72E-04, 0.584E-04, 1.19E-04*" 5.04 0.306 2223 age of volcanism K=4.18% AND 4.19%; 40AR(RAD)=0.694 AND 0.678XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6031 2 4.25 0.14 whole rock conventional K-Ar 21. YU-69-9L "4.72E-04, 0.584E-04, 1.19E-04*" 5.13 0.314 2221 age of volcanism K=4.29% AND 4.23%; 40AR(RAD)=0.709 AND 0.697XE-6 CC/GM 6031 3 4.87 0.1 feldspar conventional K-Ar 21. YU-69-9L "4.72E-04, 0.584E-04, 1.19E-04*" 2.85 0.2 38 maximum age of volcanism K=2.29% AND 2.44% 6032 1 4.87 0.3 whole rock conventional K-Ar 22. YU-69-10L "4.72E-04, 0.584E-04, 1.19E-04*" 0.299 0.021 1112 age of volcanism "K= 0.255, 0.247, AND 0.242%; 40AR(RAD)= 0.0452 AND 0.0491 X E-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6033 1 4.98 0.17 whole rock conventional K-Ar 23. YU-69-11L "4.72E-04, 0.584E-04, 1.19E-04*" 5.5 0.395 2420 HYDRATED GLASS K= 4.57 AND 4.56%; 40AR(RAD)= 0.805 AND 0.965 X E-6 CC/GM "AGE APPEARS LOW; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6033 2 5.85 0.21 whole rock conventional K-Ar 23. YU-69-11L "4.72E-04, 0.584E-04, 1.19E-04*" 5.45 0.46 2223 minimum age of volcanism HYDRATED GLASS K= 4.54 AND 4.51%; 40AR(RAD)= 1.03 AND 1.03 X E-6 CC/GM 6034 1 6.34 0.09 glass conventional K-Ar 24. YU-69-12L "4.72E-04, 0.584E-04, 1.19E-04*" 5.1 0.466 8059 age of volcanism K= 4.22 AND 4.24%; 40AR(RAD)= 1.06 AND 1.03 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6035 1 6.41 0.3 whole rock conventional K-Ar 25. YU-776A "4.72E-04, 0.584E-04, 1.19E-04*" 5.04 0.466 1614 age of volcanism K= 4.21 AND 4.16%; 40AR(RAD)= 1.04 AND 1.05 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6036 1 6.5 0.1 whole rock conventional K-Ar 26. YU-QTV2A "4.72E-04, 0.584E-04, 1.19E-04*" 5.08 0.4759 6154 age of volcanism K= 4.20 AND 4.24%; 40AR(RAD)= 1.066 AND 1.067 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6037 1 6.78 0.1 feldspar conventional K-Ar 27. YU-70-19BL "4.72E-04, 0.584E-04, 1.19E-04*" 3.64 0.356 432833 age of volcanism "K= 3.04 AND 3.01%; 40AR(RAD)= 0.791, 0.768, AND 0.833 X E-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6038 1 7.89 0.1 feldspar conventional K-Ar 28. YU-70-20L "4.72E-04, 0.584E-04, 1.19E-04*" 5.27 0.6 5558 age of volcanism K= 4.33 AND 4.42%; 40AR(RAD)= 1.37 AND 1.32 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6039 1 8.8 0.3 glass conventional K-Ar 29. YU-794A "4.72E-04, 0.584E-04, 1.19E-04*" 4.92 0.625 44 age of volcanism "K= 4.09, 4.06, AND 4.11%" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6040 1 8.63 0.2 whole rock conventional K-Ar 30. YU-929A "4.72E-04, 0.584E-04, 1.19E-04*" 4.8 0.598 50 age of volcanism K= 4.02 AND 3.95% "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6041 1 8.8 0.2 whole rock conventional K-Ar 31. YU-805A "4.72E-04, 0.584E-04, 1.19E-04*" 4.92 0.625 69 age of volcanism "K= 4.05, 4.11, AND 4.09%" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6042 1 9.39 0.5 whole rock conventional K-Ar 32. YU-801A "4.72E-04, 0.584E-04, 1.19E-04*" 3.89 0.527 18 age of volcanism K= 3.22 AND 3.24% "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6042 2 9.36 0.4 feldspar conventional K-Ar 32. YU-801A "4.72E-04, 0.584E-04, 1.19E-04*" 1.85 0.25 22 age of volcanism K= 1.54 AND 1.53% 6043 1 9.41 1.5 whole rock conventional K-Ar 33. YU-927A "4.72E-04, 0.584E-04, 1.19E-04*" 0.123 0.0167 56 age of volcanism "K= 0.099, 0.112, AND 0.095%; 40AR(RAD)= 0.035 AND 0.040 X E-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6044 1 9.81 0.1 whole rock conventional K-Ar 34. YU-70-21L "4.72E-04, 0.584E-04, 1.19E-04*" 4.54 0.643 697850 age of volcanism "K= 3.76 AND 3.77%; 40AR(RAD)= 1.46, 1.46, AND 1.40 X E-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6045 1 10.61 0.14 K feldspar conventional K-Ar 35. YU-TAV1A "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 1.27 8676 age of volcanism K= 6.85 AND 6.91%; 40AR(RAD)= 2.83 AND 2.87 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6046 1 10.78 0.14 whole rock conventional K-Ar 36. YU-924R "4.72E-04, 0.584E-04, 1.19E-04*" 5.16 0.803 5551 age of volcanism K= 4.31 AND 4.26%; 40AR(RAD)= 1.81 AND 1.79 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6047 1 8.54 0.2 whole rock conventional K-Ar 37. YU-922R "4.72E-04, 0.584E-04, 1.19E-04*" 5.25 0.647 3631 minimum age of volcanism K= 4.35 AND 4.36%; 40AR(RAD)= 1.45 AND 1.45 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6048 1 11.07 0.2 biotite conventional K-Ar 38. YU-921R "4.72E-04, 0.584E-04, 1.19E-04*" 7.32 1.17 4347 age of volcanism K= 6.08 AND 6.07%; 40AR(RAD)= 2.65 AND 2.59 X E-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6048 2 9.56 0.14 K feldspar conventional K-Ar 38. YU-921R "4.72E-04, 0.584E-04, 1.19E-04*" 10.72 1.48 7785 minimum age of volcanism K= 8.94 AND 8.86%; 40AR(RAD)= 3.32 AND 3.33 X E-6 CC/GM 6049 1 13.08 0.4 sanidine conventional K-Ar 39. YU-A162490A "4.72E-04, 0.584E-04, 1.19E-04*" 6.93 1.31 65 age of volcanism K=5.80% AND 5.71% "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6050 1 4.97 0.7 whole rock conventional K-Ar 40. YU-70-45L "4.72E-04, 0.584E-04, 1.19E-04*" 0.114 0.0082 46 minimum age of volcanism K=0.095% AND 0.095%; 40AR(RAD)=0.0170 AND 0.0196XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6051 1 6.28 0.2 whole rock conventional K-Ar 41. YU-69-41L "4.72E-04, 0.584E-04, 1.19E-04*" 0.445 0.0403 1727 age of volcanism K=0.373% AND 0.365%; 40AR(RAD)=0.0931 AND 0.0875XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6051 2 6.75 0.6 whole rock conventional K-Ar 41. YU-69-41L "4.72E-04, 0.584E-04, 1.19E-04*" 0.408 0.0397 205 age of volcanism "K=0.347%, 0.339%, 0.335%, AND 0.334%; 40AR(RAD)=0.0863 AND 0.0915XE-6 CC/GM" 6052 1 17.42 1.5 whole rock conventional K-Ar 9. YU-64-44CWF "4.72E-04, 0.584E-04, 1.19E-04*" 1.46 0.368 686 age of volcanism "K=1.21% AND 1.21%; 40AR(RAD)=0.779, 0.807, AND 0.887XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6053 1 15.47 0.5 whole rock conventional K-Ar 10. YU-423WT "4.72E-04, 0.584E-04, 1.19E-04*" 0.432 0.0966 152912 age of volcanism "K=0.355% AND 0.363%; 40AR(RAD)=0.203, 0.230, AND 0.217XE-6 CC/GM" "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6054 1 15.39 0.7 whole rock conventional K-Ar 11. YU-342WT "4.72E-04, 0.584E-04, 1.19E-04*" 1.55 0.345 1020 age of volcanism K=1.29% AND 1.28%; 40AR(RAD)=0.771 AND 0.777XE-6 CC/GM "SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6055 1 12.53 1.2 whole rock conventional K-Ar 12. YU-339WT "4.72E-04, 0.584E-04, 1.19E-04*" 1.16 0.21 58 K=0.965% AND 0.968%; 40AR(RAD)=0.467 AND 0.474XE-6 CC/GM "CALCULATED AGE SEEMS LOW; AGE IS PROBABLY 15 TO 17 M.Y.; SEE ARMSTRONG AND OTHERS (1975, AJS, P. 225-251) FOR FURTHER AGE EVALUATION" 6056 1 49.05 1.4 whole rock conventional K-Ar 1. YU-CWF12-9-X "4.72E-04, 0.584E-04, 1.19E-04*" 4.4 3.15 374648 age of volcanism "K=3.65% AND 3.65%; 40AR(RAD)=7.39, 7.13, AND 6.67XE-6 CC/GM" SEE ARMSTRONG (1974) 6057 1 47.26 1.4 whole rock conventional K-Ar 2. YU-TALBR3LT "4.72E-04, 0.584E-04, 1.19E-04*" 2.06 1.42 83 age of volcanism LIGHT COLORED K=1.72% AND 1.70% SEE ARMSTRONG (1974) 6058 1 42.56 1.2 whole rock conventional K-Ar 2. YU-TALBR3DRK "4.72E-04, 0.584E-04, 1.19E-04*" 2.29 1.42 68 age of volcanism K=1.89% AND 1.92% SEE ARMSTRONG (1974) 6059 1 48.57 1.4 biotite conventional K-Ar 3. YU-875 "4.72E-04, 0.584E-04, 1.19E-04*" 8.04 5.698 58 age of volcanism K= 6.67 AND 6.67% SEE ARMSTRONG (1974) 6060 1 46.72 1.4 whole rock conventional K-Ar 4. YU-1026 "4.72E-04, 0.584E-04, 1.19E-04*" 3.61 2.46 4429 K= 2.99 AND 3.00%; 40AR(RAD)= 5.41 AND 5.61 XE-6 CC/GM "SEE ARMSTRONG (1974); AGE IS SPURIOUS; ROCK CONTAINS CONSIDERABLE ZEOLITES ACCORDING TO D.H. MCINTYRE, U.S.G.S." 6061 1 50.09 1.5 whole rock conventional K-Ar 5. YU-1027 "4.72E-04, 0.584E-04, 1.19E-04*" 2.27 1.66 2828 age of volcanism K= 1.87 AND 1.90%; 40AR(RAD)= 3.75 AND 3.71 XE-6 CC/GM SEE ARMSTRONG (1974) 6062 1 49.05 1.4 feldspar conventional K-Ar 6. YU-1028 "4.72E-04, 0.584E-04, 1.19E-04*" 2.78 1.99 54 age of volcanism K= 2.30 AND 2.31% SEE ARMSTRONG (1974) 6063 1 47.9 1.4 whole rock conventional K-Ar 7. YU-1029 "4.72E-04, 0.584E-04, 1.19E-04*" 1.86 1.3 3026 age of volcanism K= 1.53 AND 1.55%; 40AR(RAD)= 2.90 AND 2.94 XE-6 CC/GM SEE ARMSTRONG (1974) 6064 1 39.84 1.2 plagioclase conventional K-Ar 8. YU-1031 "4.72E-04, 0.584E-04, 1.19E-04*" 1.25 0.725 2733 age of intrusion "K= 1.02, 1.03, 1.07, AND 1.05%; 40AR(RAD)= 1.65 AND 1.60 XE-6 CC/GM" SEE ARMSTRONG (1974) 6065 1 44.92 1.3 K feldspar conventional K-Ar 9. YU-1032 "4.72E-04, 0.584E-04, 1.19E-04*" 7.01 4.59 55 age of volcanism K= 5.79 AND 5.84% SEE ARMSTRONG (1974) 6066 1 43.09 1.3 whole rock conventional K-Ar 12. YU-RAP71-18 "4.72E-04, 0.584E-04, 1.19E-04*" 3.01 1.89 70 minimum age of volcanism K= 2.50 AND 2.50% SEE ARMSTRONG (1974) 6067 1 51.08 1.7 biotite conventional K-Ar 13. BL-203 "4.72E-04, 0.585E-04, 1.19E-04*" 7.45 5.557 94 age of volcanism K2O= 7.48 AND 7.42% 6068 1 43.28 1.4 biotite conventional K-Ar 14. MHS-94-71 "4.72E-04, 0.585E-04, 1.19E-04*" 7.37 4.648 56 age of volcanism K2O= 7.34 AND 7.40% 6068 2 41.26 1.4 sanidine conventional K-Ar 14. MHS-94-71 "4.72E-04, 0.585E-04, 1.19E-04*" 2.2 1.322 78 age of volcanism IMPURE SANIDINE K2O= 2.21 AND 2.19% 6069 1 39.12 1.1 whole rock conventional K-Ar 1. YU-RAP71-17 "4.72E-04, 0.584E-04, 1.19E-04*" 2.81 1.6 63 K= 2.35 AND 2.32% QUESTIONABLE AGE--PROBABLY TOO YOUNG 6070 1 36.67 1.1 whole rock conventional K-Ar 2. YU-RAP71-16 "4.72E-04, 0.584E-04, 1.19E-04*" 2.4 1.28 73 K= 1.99 AND 1.99% QUESTIONABLE AGE--PROBABLY TOO YOUNG 6071 1 29.18 1.4 whole rock conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 3.235 1.37 94 minimum age of volcanism K2O= 3.21 AND 3.26% "DUE TO LIKELY LOSS OF RADIOGENIC ARGON, AGE IS PROBABLY OLDER. AGE MENTIONED BY CATER AND OTHERS, 1973, USGS BULL. 1304, P. 29" 6072 1 7.89 2.5 glass conventional K-Ar 6. YU-1030 "4.72E-04, 0.584E-04, 1.19E-04*" 0.922 0.105 22 K= 0.766 AND 0.764%; 40AR(RAD)= 0.264 AND 0.206 XE-6 CC/GM AGE IS TOO YOUNG--APPARENT LARGE LOSS OF ARGON BY DIFFUSION 6073 1 47.1 1.4 biotite conventional K-Ar 1. YU-872 "4.72E-04, 0.584E-04, 1.19E-04*" 7.67 5.27 60 minimum age of intrusion 9% CHLORITE IN THE BIOTITE CONCENTRATE "K= 6.40, 6.37, AND 6.33%" SEE ARMSTRONG (1974) 6073 2 55.81 1.6 hornblende conventional K-Ar 1. YU-872 "4.72E-04, 0.584E-04, 1.19E-04*" 1.74 1.42 66 maximum age of intrusion IMPURE HORNBLENDE CONCENTRATE K= 1.42 AND 1.47% SEE ARMSTRONG (1974) 6074 1 45.8 1.3 biotite conventional K-Ar 2. YU-862 "4.72E-04, 0.584E-04, 1.19E-04*" 8.13 5.43 63 age of intrusion 7% CHLORITE IN BIOTITE CONCENTRATE K= 6.75 AND 6.74% SEE ARMSTRONG (1974) 6075 1 47.21 1.4 biotite conventional K-Ar 3. YU-863 "4.72E-04, 0.584E-04, 1.19E-04*" 7.38 5.082 74 age of intrusion 9% CHLORITE IN BIOTITE CONCENTRATE K= 6.17 AND 6.09% SEE ARMSTRONG (1974) 6076 1 46.46 1.4 biotite conventional K-Ar 4. YU-864 "4.72E-04, 0.584E-04, 1.19E-04*" 6.11 4.14 58 age of intrusion 15% CHLORITE IN THE BIOTITE CONCENTRATE K= 5.10 AND 5.05% SEE ARMSTRONG (1974) 6077 1 48.88 1.4 biotite conventional K-Ar 5. YU-RAP71-15 "4.72E-04, 0.584E-04, 1.19E-04*" 3.21 2.29 64 age of intrusion 30% CHLORITE IN THE BIOTITE CONCENTRATE K= 2.66 AND 2.67% SEE ARMSTRONG (1974) 6078 1 48.71 1.4 biotite conventional K-Ar 9. YU-1033 "4.72E-04, 0.584E-04, 1.19E-04*" 6.93 4.926 82 age of intrusion K= 5.80 AND 5.70% SEE ARMSTRONG (1974) 6079 1 45.37 1.3 biotite conventional K-Ar 10. YU-1034 "4.72E-04, 0.584E-04, 1.19E-04*" 7.05 4.663 74 minimum age of intrusion BIOTITE LOOKS SLIGHTLY OXIDIZED K= 5.86 AND 5.84% SEE ARMSTRONG (1974) 6080 1 48.68 1.4 biotite conventional K-Ar 11. YU-1035 "4.72E-04, 0.584E-04, 1.19E-04*" 6.84 4.859 68 age of intrusion K= 5.72 AND 5.63% SEE ARMSTRONG (1974) 6081 1 45.53 1.3 phlogopite conventional K-Ar 13. YU-802 "4.72E-04, 0.584E-04, 1.19E-04*" 9.84 6.532 51 age of intrusion K= 8.16 AND 8.17% SEE ARMSTRONG (1974) 6082 1 45.31 1.3 biotite conventional K-Ar 15. YU-1023 "4.72E-04, 0.584E-04, 1.19E-04*" 6.76 4.466 79 age of intrusion SLIGHTLY WEATHERED BIOTITE K= 5.66 AND 5.57% SEE ARMSTRONG (1974) 6083 1 44.84 1.3 biotite conventional K-Ar 16. YU-1022 "4.72E-04, 0.584E-04, 1.19E-04*" 5.37 3.51 66 age of intrusion K= 4.46 AND 4.45% SEE ARMSTRONG (1974) 6084 1 43.87 1.3 biotite conventional K-Ar 17. YU-FWC 6-67 "4.72E-04, 0.584E-04, 1.19E-04*" 3.91 2.5 58 age of intrusion K= 3.25 AND 3.24% SEE ARMSTRONG (1974) 6085 1 30.84 2 biotite conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 4.02 1.8 2726 40AR(RAD)= 0.00776 AND 0.00660 PPM "AGE IS APPARENTLY TOO YOUNG; AGE MENTIONED BY CATER AND OTHERS, 1973, USGS BULL. 1304, P. 27" 6085 2 42.61 2 sanidine conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 5.96 3.7 59 age of intrusion "AGE IS QUESTIONABLE BECAUSE OF DISCORDANT BIOTITE AND SANIDINE AGES; THIS AGE MENTIONED BY CATER AND OTHERS, 1973, USGS BULL. 1304, P. 27" 6086 1 52.14 2 hornblende conventional K-Ar 23. DRS-22-69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.79 0.6017 74 age of intrusion 6086 2 47.91 2 biotite conventional K-Ar 23. DRS-22-69 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 6.109 90 minimum age of intrusion 6087 1 46.42 1.3 biotite conventional K-Ar 24. YU-WT268 "4.72E-04, 0.584E-04, 1.19E-04*" 8.47 5.734 66 age of intrusion K= 7.00 AND 7.06% SEE ARMSTRONG (1974) 6087 2 51.1 1.5 hornblende conventional K-Ar 24. YU-WT268 "4.72E-04, 0.584E-04, 1.19E-04*" 1.12 0.8357 18 age of intrusion K= 0.905 AND 0.956% SEE ARMSTRONG (1974) 6091 1 219.61 5 biotite conventional K-Ar 8. YU-984 "4.72E-04, 0.585E-04, 1.19E-04*" 3.81 12.81 95 age of intrusion K= 3.16% 6092 1 192.12 6 hornblende conventional K-Ar 10. YU-985 "4.72E-04, 0.585E-04, 1.19E-04*" 0.418 1.22 7461 HORNBLENDE-PYROXENE MIXTURE "K= 0.357, 0.348, AND 0.336%; 40AR(RAD)= 2.67 AND 2.79 XE-6 CC/GM" AGE TOO YOUNG; SHOULD BE AROUND 200 M.Y. OLD 6093 1 195.94 6 biotite conventional K-Ar 11. YU-986 "4.72E-04, 0.585E-04, 1.19E-04*" 1.99 5.93 83 minimum age of intrusion BIOTITE-HORNBLENDE MIXTURE "K= 1.71, 1.62, AND 1.61%" 6094 1 165.41 11 hornblende conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 0.296 0.7382 age not evaluated CHLORITIZED HORNBLENDE K= 0.247 AND 0.245%; 40AR(RAD)= 0.003026 AND 0.002875 PPM 6095 1 70.1 2 muscovite conventional K-Ar 21. DRS-15-69 "4.72E-04, 0.584E-04, 1.19E-04*" 9.86 10.147 74 MAY BE AGE OF MINERALIZATION 6096 1 71.22 2 biotite conventional K-Ar 22. DRS-16-69 "4.72E-04, 0.585E-04, 1.19E-04*" 8.23 8.607 95 age of intrusion 6097 1 68.84 2 biotite conventional K-Ar 23. DRS-24-69 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 8.85 91 age of intrusion 6098 1 90.51 3 biotite conventional K-Ar 25. SWH-45-72 "4.72E-04, 0.585E-04, 1.19E-04*" 8.935 11.94 91 K2O= 8.93 AND 8.94% AGE IS PROBABLY A REDUCED AGE; STOCK MAY BE PART OF IDAHO BATHOLITH 6099 1 98.04 3.3 biotite conventional K-Ar 24. R-130 "4.72E-04, 0.585E-04, 1.19E-04*" 8.845 12.83 94 K2O= 8.86 AND 8.83% AGE IS PROBABLY A REDUCED AGE; STOCK MAY BE PART OF IDAHO BATHOLITH 6102 1 47.28 1.9 hornblende conventional K-Ar 9. FWC-72-69 "4.72E-04, 0.584E-04, 1.19E-04*" 0.488 0.3366 60 PROBABLY A REDUCED AGE 6107 1 78.53 2 biotite conventional K-Ar 31. YU-877(MCC-9A) "4.72E-04, 0.584E-04, 1.19E-04*" 6.7 7.742 58 age not evaluated BIOTITE PLUS 20% CHLORITE K=5.59% AND 5.54% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6109 1 66.79 2 biotite conventional K-Ar 30. YU-876(MCC-22) "4.72E-04, 0.584E-04, 1.19E-04*" 8.96 8.777 71 age not evaluated BIOTITE PLUS 6% CHLORITE "K=7.44%, 7.47%, AND 7.40%" "SAMPLE LISTED BY ARMSTRONG (1974); THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6117 1 71.33 2 biotite conventional K-Ar 33. YU-925 "4.72E-04, 0.584E-04, 1.19E-04*" 8.66 9.071 86 K=7.20% AND 7.17% "PROBABLY A REDUCED AGE. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6118 1 73.04 2 biotite conventional K-Ar 34. YU-926 "4.72E-04, 0.584E-04, 1.19E-04*" 8.76 9.401 78 K=7.34% AND 7.21% "PROBABLY A REDUCED AGE. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6119 1 96.84 3 biotite conventional K-Ar 35. YU-1040 "4.72E-04, 0.584E-04, 1.19E-04*" 7.38 10.57 93 minimum age of intrusion K=6.09% AND 6.17% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6120 1 80.93 2 biotite conventional K-Ar 36. YU-1041 "4.72E-04, 0.584E-04, 1.19E-04*" 8.61 10.26 87 K=7.10% AND 7.19% "PROBABLY A REDUCED AGE. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6121 1 83.87 2 biotite conventional K-Ar 37. YU-1042 "4.72E-04, 0.584E-04, 1.19E-04*" 8.52 10.53 85 K=7.10% AND 7.04% "PROBABLY A REDUCED AGE. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6122 1 81.4 2 biotite conventional K-Ar 38. YU-1043 "4.72E-04, 0.584E-04, 1.19E-04*" 8.45 10.13 89 K=7.03% AND 7.00% "PROBABLY A REDUCED AGE. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6123 1 64.24 1.9 biotite conventional K-Ar 39. YU-871 "4.72E-04, 0.584E-04, 1.19E-04*" 9.28 8.737 79 BIOTITE PLUS 4% CHLORITE K=7.70% AND 7.71% PROBABLY A REDUCED AGE 6125 1 119.4 4 biotite conventional K-Ar 41. YU-WT1003 "4.72E-04, 0.584E-04, 1.19E-04*" 7.99 14.2 79 K=6.63% AND 6.63% "AGE APPEARS TOO YOUNG. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6125 2 139.8 4 hornblende conventional K-Ar 41. YU-WT1003 "4.72E-04, 0.584E-04, 1.19E-04*" 0.712 1.49 5931 age of intrusion "K=0.586%, 0.577%, AND 0.611%; 40AR(RAD)=3.40 AND 3.28XE-6 CC/GM" "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6132 1 123.66 4 whole rock conventional K-Ar 42. YU-983 "4.72E-04, 0.584E-04, 1.19E-04*" 8.08 14.89 81 minimum age of intrusion K=6.69% AND 6.72% "AGE ALSO REPORTED BY WHITE, 1973, GSA, V.84, P. 199-210" 6132 2 130.36 4 hornblende conventional K-Ar 42. YU-983 "4.72E-04, 0.584E-04, 1.19E-04*" 2.23 4.34 7687 minimum age of intrusion HORNBLENDE-BIOTITE MIXTURE K=1.82% AND 1.88%; 40AR(RAD)=9.80 AND 9.64XE-6 CC/GM "AGE ALSO REPORTED BY WHITE, 1973, GSA, V.84, P. 199-210" 6135 1 78.03 2 biotite conventional K-Ar 45. YU-WT160 "4.72E-04, 0.584E-04, 1.19E-04*" 8.22 9.437 83 minimum age of intrusion K=6.72% AND 6.93% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6135 2 91.35 3 hornblende conventional K-Ar 45. YU-WT160 "4.72E-04, 0.584E-04, 1.19E-04*" 1.295 1.747 7065 maximum age of intrusion "K=1.080%, 1.079%, AND 1.067%; 40AR(RAD)=3.89 AND 3.94XE-6 CC/GM" "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6137 1 76.62 2 biotite conventional K-Ar 46. YU-WT258 "4.72E-04, 0.584E-04, 1.19E-04*" 8.91 10.04 80 age of intrusion K=7.38% AND 7.41% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6138 1 83.98 2 biotite conventional K-Ar 49. YU-WT133 "4.72E-04, 0.584E-04, 1.19E-04*" 8.67 10.73 84 age of intrusion K=7.20% AND 7.20% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6138 2 119.3 4 hornblende conventional K-Ar 49. YU-WT133 "4.72E-04, 0.584E-04, 1.19E-04*" 1.408 2.5 6937 "K=1.176%, 1.176%, AND 1.156%; 40AR(RAD)=5.66 AND 5.55XE-6 CC/GM" "THIS MAY BE A PRIMARY AGE OR MAY BE SPURIOUS BECAUSE OF EXCESS ARGON. THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6146 1 86.32 3 biotite conventional K-Ar 51. YU-WT151 "4.72E-04, 0.584E-04, 1.19E-04*" 9.23 11.75 79 age of intrusion K=7.68% AND 7.65% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6148 1 70.97 2 biotite conventional K-Ar 54. YU-WT236 "4.72E-04, 0.584E-04, 1.19E-04*" 9.27 9.66 77 K=7.72% AND 7.67% "PROBABLY A REDUCED AGE; THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6151 1 66.02 2 biotite conventional K-Ar 53. YU-WT242 "4.72E-04, 0.584E-04, 1.19E-04*" 8.37 8.103 79 K=6.97% AND 6.93% "PROBABLY A REDUCED AGE; THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6153 1 73.45 2 biotite conventional K-Ar 56. YU-WT204 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 9.767 83 age of intrusion K=7.52% AND 7.50% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6155 1 89.22 3 biotite conventional K-Ar 57. YU-WT261 "4.72E-04, 0.584E-04, 1.19E-04*" 8.46 11.14 68 age of intrusion K=6.98% AND 7.07% "THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6160 1 72.76 2 biotite conventional K-Ar 59. YU-WT714 "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 9.343 85 K=7.25% AND 7.26% "APPEARS TO BE A REDUCED AGE; THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6160 2 83.49 2 hornblende conventional K-Ar 59. YU-WT714 "4.72E-04, 0.584E-04, 1.19E-04*" 1.52 1.87 7268 minimum age of intrusion "K=1.25%, 1.28%, AND 1.26%; 40AR(RAD)=4.27 AND 4.12XE-6 CC/GM" "AGE MAY BE A REDUCED AGE; THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6162 1 124.34 4 biotite conventional K-Ar 60. YU-WT791 "4.72E-04, 0.584E-04, 1.19E-04*" 8.93 16.55 80 K=7.35% AND 7.47% "AGE MAY BE THE AGE OF EMPLACEMENT OR MAY BE A RESET AGE; THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6162 2 144.23 4 hornblende conventional K-Ar 60. YU-WT791 "4.72E-04, 0.584E-04, 1.19E-04*" 0.717 1.55 5349 "K=0.589%, 0.583%, AND 0.614%; 40AR(RAD)=3.57 AND 3.39XE-6 CC/GM" "AGE MAY BE A PRIMARY AGE OR MAY BE SPURIOUS DUE TO EXCESS ARGON; THIS DATA ALSO REPORTED BY ARMSTRONG, TAUBENECK, AND HALES (1977)" 6166 1 128.26 5 sericite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 2.9 5.55 K=2.58% AND 2.24%; 40AR(RAD)=0.0221 AND 0.0223 PPM AGE OF ALTERATION 6167 1 121.5 6 biotite conventional K-Ar 2. VCF-23 "4.72E-04, 0.585E-04, 1.19E-04*" 3.04 5.5 72 SECONDARY BIOTITE (IMPURE CONCENTRATE) AGE MAY INDICATE TIME OF MINERALIZATION OR MAY BE SPURIOUS 6168 1 104.08 5 biotite conventional K-Ar 2. VCF-30 "4.72E-04, 0.585E-04, 1.19E-04*" 7.17 11.06 89 SECONDARY BIOTITE AGE MAY INDICATE TIME OF MINERALIZATION OR MAY BE SPURIOUS 6174 1 47.28 1.9 hornblende conventional K-Ar 9. FWC-72-69 "4.72E-04, 0.584E-04, 1.19E-04*" 0.488 0.3366 60 initial age disturbed by later metamorphism 6175 1 44.73 1.3 biotite conventional K-Ar K1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.43 5.497 74 age of uplift and cooling K=7.00% AND 6.99% "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 22" 6183 1 44.36 1.3 biotite conventional K-Ar K10 "4.72E-04, 0.584E-04, 1.19E-04*" 8.73 5.644 76 age of uplift and cooling K=7.31% AND 7.18% "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 21" 6233 1 54.8 1.6 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 9.08 7.274 94 maximum age of intrusion 6234 1 50.87 1.5 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 6.76 75 age of intrusion 6235 1 51.95 1.6 biotite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 9.18 6.966 92 maximum age of intrusion 6236 1 50.56 1.5 biotite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 9.06 6.688 93 age of intrusion 6237 1 89.77 2.6 biotite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.98 11.9 96 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6237 2 94.99 2.8 hornblende conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.866 1.216 76 minimum age of intrusion 6238 1 100.32 2.9 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 9.48 14.08 83 age of intrusion 6239 1 82.09 2.4 biotite conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.19 9.903 77 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6240 1 50 1.5 muscovite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 10.62 7.752 92 age of intrusion 6241 1 52.08 1.5 biotite conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 9.51 7.234 94 age of intrusion 6242 1 89.19 2.6 biotite conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.19E-04*" 9.2 12.11 91 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6243 1 54.47 1.6 biotite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 9.03 7.19 94 age meaning uncertain (geologic factors) "AGE MAY BE A BIT TOO OLD, EXCESS ARGON MAY BE PRESENT" 6243 2 50.04 1.5 muscovite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 10.83 7.912 89 age of intrusion PRIMARY MUSCOVITE 6244 1 52.85 1.5 biotite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 7.026 65 age of intrusion 6244 2 54.32 1.6 muscovite conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04*" 10.7 8.495 83 maximum age of intrusion 6245 1 70.34 2 biotite conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 9.49 9.8 95 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6246 1 100.44 2.9 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.83 13.13 95 age meaning uncertain (geologic factors) AGE MAY BE TOO OLD; EXCESS ARGON PRESENT? 6246 2 94.9 2.8 muscovite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 10.8 15.15 86 age of intrusion 6247 1 106.74 3.1 biotite conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04*" 8.66 13.71 91 age of intrusion 6248 1 110.41 3.2 biotite conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 9.23 15.13 92 maximum age of intrusion 6249 1 62.26 1.8 biotite conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.19E-04*" 9.35 8.527 94 initial age disturbed by later metamorphism 6250 1 68.34 2 biotite conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04*" 9.28 9.306 83 initial age disturbed by later metamorphism 6251 1 89.29 2.6 biotite conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 8.59 11.32 94 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6252 1 86.67 2.5 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04*" 9.27 11.85 96 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6253 1 97.7 2.9 muscovite conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.19E-04*" 10.35 14.96 92 age of intrusion 6254 1 98.82 2.9 biotite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 9.3 13.6 96 age of intrusion 6255 1 98.62 2.9 biotite conventional K-Ar 23 "4.72E-04, 0.584E-04, 1.19E-04*" 8.86 12.93 87 age of intrusion 6256 1 103.63 3 biotite conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04*" 9.11 13.99 93 age of intrusion 6256 2 103.83 3 muscovite conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04*" 10.58 16.28 95 age of intrusion 6257 1 100.28 2.9 biotite conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 8.42 12.5 93 age of intrusion -60+100 MESH "K2O=8.42% AND 8.42% (ENGELS AND OTHERS, 1976)" 6257 2 99.8 2.9 hornblende conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04*" 0.836 1.235 81 age of intrusion -140+200 MESH "K2O=0.837% AND 0.835% (ENGELS AND OTHERS, 1976)" 6258 1 80.39 2.4 biotite conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 10.51 82 initial age disturbed by later metamorphism -60+140 MESH "K2O=8.88% AND 8.88% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6258 2 87.98 2.6 muscovite conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04*" 10.77 13.98 91 initial age disturbed by later metamorphism "K2O=10.77% AND 10.77% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6259 1 92.95 3 biotite conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04*" 5.76 7.91 92 minimum age of intrusion AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6259 2 98.62 3 muscovite conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04*" 9.73 14.2 92 age of intrusion 6260 1 94.65 3 biotite conventional K-Ar 28 "4.72E-04, 0.584E-04, 1.19E-04*" 8.72 12.2 93 minimum age of intrusion 6261 1 102.66 2.8 biotite conventional K-Ar 29 "4.72E-04, 0.584E-04, 1.19E-04*" 9.14 13.9 75 age of intrusion 6262 1 79.89 3 biotite conventional K-Ar 30 "4.72E-04, 0.584E-04, 1.19E-04*" 9.26 10.89 90 initial age disturbed by later metamorphism -60 +140 MESH "K2O=9.16%, 9.18%, 9.18%, AND 9.16% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6262 2 86.42 4 muscovite conventional K-Ar 30 "4.72E-04, 0.584E-04, 1.19E-04*" 10.64 13.56 89 initial age disturbed by later metamorphism -100 +140 MESH "K2O=10.64%, 10.70%, 10.61%, AND 10.70%" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM 6263 1 100.34 2.9 biotite conventional K-Ar 31 "4.72E-04, 0.584E-04, 1.19E-04*" 8.63 12.82 86 age of intrusion 6264 1 99.01 2.9 biotite conventional K-Ar 32 "4.72E-04, 0.584E-04, 1.19E-04*" 8.64 12.66 95 age of intrusion 6265 1 52.42 1.5 biotite conventional K-Ar 33 "4.72E-04, 0.584E-04, 1.19E-04*" 8.96 6.861 90 AGE IS PROBABLY LOW 6266 1 50.55 1.5 biotite conventional K-Ar 34 "4.72E-04, 0.584E-04, 1.19E-04*" 8.65 6.384 95 THIS IS PROBABLY A REDUCED AGE 6266 2 57.32 1.7 muscovite conventional K-Ar 34 "4.72E-04, 0.584E-04, 1.19E-04*" 10.72 8.988 93 THIS IS PROBABLY A REDUCED AGE 6267 1 93.14 2.7 biotite conventional K-Ar 35 "4.72E-04, 0.584E-04, 1.19E-04*" 8.64 11.89 92 -60 +140 MESH "K2O=8.64% AND 8.64% (ENGELS AND OTHERS, 1976)" PLUTON IS PROBABLY AROUND 100 M.Y. OLD 6267 2 96.63 2.8 muscovite conventional K-Ar 35 "4.72E-04, 0.584E-04, 1.19E-04*" 10.72 15.32 86 "K2O=10.72% AND 10.73% (ENGELS AND OTHERS, 1976)" PLUTON IS PROBABLY AROUND 100 M.Y. OLD 6268 1 91.98 2.7 biotite conventional K-Ar 36 "4.72E-04, 0.584E-04, 1.19E-04*" 9.23 12.54 83 initial age disturbed by later metamorphism 6269 1 48.92 1.4 biotite conventional K-Ar 37 "4.72E-04, 0.584E-04, 1.19E-04*" 9.46 6.754 81 age of intrusion 6270 1 94.18 2.8 biotite conventional K-Ar 38 "4.72E-04, 0.584E-04, 1.19E-04*" 9.21 12.82 91 initial age disturbed by later metamorphism 6271 1 50.8 1.5 biotite conventional K-Ar 39 "4.72E-04, 0.584E-04, 1.19E-04*" 9.04 6.705 83 age of intrusion 6272 1 50.22 1.5 biotite conventional K-Ar 40 "4.72E-04, 0.584E-04, 1.19E-04*" 9.24 6.775 88 age of intrusion 6272 2 49.9 1.5 muscovite conventional K-Ar 40 "4.72E-04, 0.584E-04, 1.19E-04*" 10.7 7.794 92 age of intrusion 6273 1 48.5 1.4 biotite conventional K-Ar 41 "4.72E-04, 0.584E-04, 1.19E-04*" 8.47 5.995 81 age of intrusion 6273 2 50.34 1.5 muscovite conventional K-Ar 41 "4.72E-04, 0.584E-04, 1.19E-04*" 10.61 7.798 92 age of intrusion 6274 1 97.55 2.8 biotite conventional K-Ar 45 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 13.06 87 minimum age of intrusion 6275 1 92.26 2.7 biotite conventional K-Ar 46 "4.72E-04, 0.584E-04, 1.19E-04*" 9.18 12.51 91 APPEARS TO BE A REDUCED AGE 6276 1 48.09 1.4 biotite conventional K-Ar 47 "4.72E-04, 0.584E-04, 1.19E-04*" 8.8 6.174 86 AGE IS PROBABLY A REDUCED AGE AND REFLECTS AN EOCENE THERMAL EVENT 6277 1 57.89 1.7 biotite conventional K-Ar 48 "4.72E-04, 0.584E-04, 1.19E-04*" 9.28 7.86 40 initial age disturbed by later metamorphism 6278 1 49.81 1.5 biotite conventional K-Ar 49 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 6.616 76 age meaning uncertain (geologic factors) 6279 1 42.75 1.2 biotite conventional K-Ar 50 "4.72E-04, 0.584E-04, 1.19E-04*" 9.35 5.824 93 age not evaluated 6280 1 45.58 1.3 biotite conventional K-Ar 51 "4.72E-04, 0.584E-04, 1.19E-04*" 9.08 6.034 56 initial age disturbed by later metamorphism PLUTON MAY BE AROUND 100 M.Y. OLD 6281 1 45.86 1.3 biotite conventional K-Ar 52 "4.72E-04, 0.584E-04, 1.19E-04*" 8.81 5.891 91 initial age disturbed by later metamorphism PLUTON MAY BE AROUND 100 M.Y. OLD 6281 2 57.48 1.7 hornblende conventional K-Ar 52 "4.72E-04, 0.584E-04, 1.19E-04*" 0.777 0.6533 57 initial age disturbed by later metamorphism PLUTON MAY BE AROUND 100 M.Y. OLD 6282 1 47.02 1.4 biotite conventional K-Ar 53 "4.72E-04, 0.584E-04, 1.19E-04*" 9.26 6.351 94 THIS AGE MAY BE A REDUCED AGE AND MAY REFLECT AN EOCENE THERMAL EVENT 6283 1 47.95 1.4 biotite conventional K-Ar 54 "4.72E-04, 0.584E-04, 1.19E-04*" 9.07 6.345 93 age of intrusion 6283 2 57.69 1.7 hornblende conventional K-Ar 54 "4.72E-04, 0.584E-04, 1.19E-04*" 1.66 1.401 76 INTERPRETATION OF THIS AGE IS DIFFICULT; AGE MAY BE SPURIOUS DUE TO EXCESS ARGON 6284 1 46.33 1.4 biotite conventional K-Ar 55 "4.72E-04, 0.584E-04, 1.19E-04*" 9.16 6.189 91 age of intrusion 6285 1 46.23 1.4 biotite conventional K-Ar 56 "4.72E-04, 0.584E-04, 1.19E-04*" 9.39 6.33 90 age of intrusion 6286 1 71.69 2.1 biotite conventional K-Ar 57 "4.72E-04, 0.584E-04, 1.19E-04*" 9.44 9.94 92 initial age disturbed by later metamorphism 6287 1 87.72 2.5 biotite conventional K-Ar 58 "4.72E-04, 0.584E-04, 1.19E-04*" 8.94 11.57 94 initial age disturbed by later metamorphism PLUTON MAY BE AROUND 100 M.Y. OLD 6288 1 85.58 2.5 biotite conventional K-Ar 59 "4.72E-04, 0.584E-04, 1.19E-04*" 8.9 11.23 95 initial age disturbed by later metamorphism PLUTON MAY BE AROUND 100 M.Y. OLD 6289 1 74.61 2.2 biotite conventional K-Ar 60 "4.72E-04, 0.584E-04, 1.19E-04*" 8.78 9.629 90 age not evaluated 6290 1 83.82 2.4 biotite conventional K-Ar 61 "4.72E-04, 0.584E-04, 1.19E-04*" 8.84 10.92 91 age not evaluated 6291 1 46.61 1.4 biotite conventional K-Ar 62 "4.72E-04, 0.584E-04, 1.19E-04*" 9.09 6.179 90 age not evaluated 6292 1 47.31 1.4 biotite conventional K-Ar 63 "4.72E-04, 0.584E-04, 1.19E-04*" 9.41 6.494 91 age of intrusion 6293 1 48.19 1.4 biotite conventional K-Ar 64 "4.72E-04, 0.584E-04, 1.19E-04*" 9.5 6.68 72 age of intrusion K2O=9.49% AND 9.52% 6293 2 49.94 1.7 muscovite conventional K-Ar 64 "4.72E-04, 0.584E-04, 1.19E-04*" 10.74 7.829 57 age of intrusion K2O=10.73% AND 10.76% 6294 1 48.42 1.6 biotite conventional K-Ar 65 "4.72E-04, 0.584E-04, 1.19E-04*" 9.42 6.655 66 age of intrusion K2O=9.40% AND 9.43% 6294 2 48.65 1.9 muscovite conventional K-Ar 65 "4.72E-04, 0.584E-04, 1.19E-04*" 10.66 7.568 70 age of intrusion K2O=10.65% AND 10.67% 6295 1 49.02 2.6 biotite conventional K-Ar 66 "4.72E-04, 0.584E-04, 1.19E-04*" 9.17 6.56 24 minimum age of intrusion "K2O=9.19% AND 9.22% (ENGELS AND OTHERS, 1976)" 6295 2 54.18 1.6 muscovite conventional K-Ar 66 "4.72E-04, 0.584E-04, 1.19E-04*" 10.74 8.504 75 age of intrusion "K2O=10.73% AND 10.75% (ENGELS AND OTHERS, 1976)" 6296 1 49.17 1.5 biotite conventional K-Ar 67 "4.72E-04, 0.584E-04, 1.19E-04*" 8.57 6.15 84 initial age disturbed by later metamorphism THIS AGE MAY INDICATE AN EOCENE THERMAL EVENT 6296 2 87.4 2.6 hornblende conventional K-Ar 67 "4.72E-04, 0.584E-04, 1.19E-04*" 1.165 1.502 79 initial age disturbed by later metamorphism 6297 1 48.79 1 biotite conventional K-Ar 68 "4.72E-04, 0.584E-04, 1.19E-04*" 8.45 6.016 78 age of intrusion "K2O=8.40%, 8.33%, AND 8.45% (ENGELS AND OTHERS, 1976)" 6297 2 52.28 5 hornblende conventional K-Ar 68 "4.72E-04, 0.584E-04, 1.19E-04*" 0.6078 0.4642 62 age of intrusion 6298 1 47.83 1.3 biotite conventional K-Ar 69 "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 6.197 70 age of intrusion "K2O=8.88% AND 8.88% (ENGELS AND OTHERS, 1976)" 6298 2 47.99 1.7 hornblende conventional K-Ar 69 "4.72E-04, 0.584E-04, 1.19E-04*" 0.689 0.4824 49 age of intrusion "K2O=0.685% AND 0.693% (ENGELS AND OTHERS, 1976)" 6299 1 95.52 2.8 biotite conventional K-Ar 70 "4.72E-04, 0.584E-04, 1.19E-04*" 8.27 11.68 95 minimum age of intrusion "ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6299 2 102.72 3 muscovite conventional K-Ar 70 "4.72E-04, 0.584E-04, 1.19E-04*" 10.33 15.72 93 maximum age of intrusion "ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6300 1 97.53 2.8 biotite conventional K-Ar 71 "4.72E-04, 0.584E-04, 1.19E-04*" 9.08 13.1 94 age of intrusion "ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6300 2 99.3 2.8 muscovite conventional K-Ar 71 "4.72E-04, 0.584E-04, 1.19E-04*" 10.75 15.8 93 age of intrusion "ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6301 1 49.52 1.5 biotite conventional K-Ar 72 "4.72E-04, 0.584E-04, 1.19E-04*" 9.25 6.686 88 age of intrusion "ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6301 2 49.09 1.5 muscovite conventional K-Ar 72 "4.72E-04, 0.584E-04, 1.19E-04*" 10.32 7.394 89 age of intrusion "ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6302 1 100.97 2.8 biotite conventional K-Ar 73 "4.72E-04, 0.584E-04, 1.19E-04*" 9.13 13.65 97 age of intrusion "K2O=9.13% AND 9.13% (ENGELS AND OTHERS, 1976)" 6302 2 102.57 2.8 muscovite conventional K-Ar 73 "4.72E-04, 0.584E-04, 1.19E-04*" 10.3 15.65 97 age of intrusion "K2O=10.29% AND 10.30% (ENGELS AND OTHERS, 1976)" 6303 1 100.71 3.2 biotite conventional K-Ar 74 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 13.57 96 age of intrusion "K2O=9.09% AND 9.12% (ENGELS AND OTHERS, 1976)" 6304 1 49.59 1.5 biotite conventional K-Ar 75 "4.72E-04, 0.584E-04, 1.19E-04*" 8.28 5.993 86 "AGE MAY BE A PRIMARY AGE OR A REDUCED AGE. ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6304 2 51.06 1.5 muscovite conventional K-Ar 75 "4.72E-04, 0.584E-04, 1.19E-04*" 10.8 8.053 79 "AGE MAY BE A PRIMARY AGE OR A REDUCED AGE. ANALYTICAL DATA FROM E.H. MCKEE, USGS" 6305 1 56.74 2 biotite conventional K-Ar 76 "4.72E-04, 0.584E-04, 1.19E-04*" 9.12 7.568 86 age not evaluated "K2O=9.11% AND 9.13% (ENGELS AND OTHERS, 1976)" 6305 2 57.55 2 muscovite conventional K-Ar 76 "4.72E-04, 0.584E-04, 1.19E-04*" 10.74 9.042 78 age not evaluated "K2O=10.74% AND 10.75% (ENGELS AND OTHERS, 1976)" 6306 1 95.59 2.6 biotite conventional K-Ar 77 "4.72E-04, 0.584E-04, 1.19E-04*" 7.96 11.25 81 minimum age of intrusion "K2O=7.93% AND 7.98% (ENGELS AND OTHERS, 1976)" APPARENTLY LOW AGE MAY BE DUE TO ARGON LOSS CAUSED BY LATER PLUTONISM 6306 2 97.33 4 hornblende conventional K-Ar 77 "4.72E-04, 0.584E-04, 1.19E-04*" 0.996 1.434 83 age of intrusion "K2O=0.993% AND 0.998% (ENGELS AND OTHERS, 1976)" 6307 1 79.87 2 muscovite conventional K-Ar 78 "4.72E-04, 0.584E-04, 1.19E-04*" 10.24 12.04 92 initial age disturbed by later metamorphism "K2O=10.21% AND 10.26% (ENGELS AND OTHERS, 1976)" APPARENTLY LOW AGE PROBABLY DUE TO ARGON LOSS CAUSED BY LATER PLUTONISM 6308 1 51.18 1 biotite conventional K-Ar 79 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 6.502 88 minimum age of intrusion -35 +60 MESH "K2O=8.68% AND 8.72% (ENGELS AND OTHERS, 1976)" 6308 2 61.05 2 hornblende conventional K-Ar 79 "4.72E-04, 0.584E-04, 1.19E-04*" 0.817 0.7304 67 age not evaluated -100 +170 MESH K2O=0.817% AND 0.817% 6309 1 51.68 2 biotite conventional K-Ar 80 "4.72E-04, 0.584E-04, 1.19E-04*" 8.82 6.657 88 age of intrusion -32 +60 MESH "K2O=8.80% AND 8.85% (ENGELS AND OTHERS, 1976)" 6310 1 50.09 2 biotite conventional K-Ar 81 "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 6.493 89 minimum age of intrusion -35 +115 MESH "K2O=8.88% AND 8.88% (ENGELS AND OTHERS, 1976)" 6310 2 64.26 2 hornblende conventional K-Ar 81 "4.72E-04, 0.584E-04, 1.19E-04*" 0.874 0.8231 73 age not evaluated -100 +140 MESH "K2O=0.870% AND 0.878% (ENGELS AND OTHERS, 1976)" 6311 1 78.1 2.3 biotite conventional K-Ar 82 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 10.4 89 initial age disturbed by later metamorphism 6312 1 155.53 4.6 biotite conventional K-Ar 83 "4.72E-04, 0.584E-04, 1.19E-04*" 9.1 21.28 96 initial age disturbed by later metamorphism AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM; TRUE EMPLACEMENT AGE IS CONSIDERED TO BE ABOUT 170 M.Y. 6312 2 165.14 4.8 hornblende conventional K-Ar 83 "4.72E-04, 0.584E-04, 1.19E-04*" 1.597 3.976 86 minimum age of intrusion TRUE EMPLACEMENT AGE IS CONSIDERED TO BE ABOUT 170 M.Y. 6313 1 100.13 2.9 biotite conventional K-Ar 84 "4.72E-04, 0.584E-04, 1.19E-04*" 9.04 13.4 86 minimum age of intrusion 6314 1 99.52 5 biotite conventional K-Ar 85 "4.72E-04, 0.584E-04, 1.19E-04*" 8.71 12.83 85 initial age disturbed by later metamorphism "K2O=8.61%, 8.61%, 8.63%, 8.63%, 8.70%, AND 8.72% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM; TRUE EMPLACEMENT AGE MAY BE 200+ M.Y. 6314 2 198.41 7 hornblende conventional K-Ar 85 "4.72E-04, 0.584E-04, 1.19E-04*" 1.44 4.348 89 minimum age of intrusion "K2O=1.44%, 1.44%, 1.44%, AND 1.44% (ENGELS AND OTHERS, 1976)" TRUE EMPLACEMENT AGE MAY BE 200+ M.Y. 6315 1 86.3 3 biotite conventional K-Ar 86 "4.72E-04, 0.584E-04, 1.19E-04*" 8.18 10.41 72 initial age disturbed by later metamorphism -80 +120 MESH "K2O=8.17% AND 8.18% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM; TRUE EMPLACEMENT AGE MAY BE 200+ M.Y. 6315 2 187.32 6 hornblende conventional K-Ar 86 "4.72E-04, 0.584E-04, 1.19E-04*" 1.41 4.007 91 minimum age of intrusion -150 +200 MESH "K2O=1.41% AND 1.41% (ENGELS AND OTHERS, 1976)" TRUE EMPLACEMENT AGE MAY BE 200+ M.Y. 6316 1 65.51 3 biotite conventional K-Ar 87 "4.72E-04, 0.584E-04, 1.19E-04*" 8.83 8.481 30 initial age disturbed by later metamorphism -45 +80 MESH "K2O=8.81% AND 8.84% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM; TRUE EMPLACEMENT AGE MAY BE 200+ M.Y. 6316 2 145.94 5 hornblende conventional K-Ar 87 "4.72E-04, 0.584E-04, 1.19E-04*" 1.39 3.042 89 initial age disturbed by later metamorphism "K2O=1.38% AND 1.40% (ENGELS AND OTHERS, 1976)" AGE IS PROBABLY LOW DUE TO LOSS OF ARGON CAUSED BY LATER PLUTONISM; TRUE EMPLACEMENT AGE MAY BE 200+ M.Y. 6317 1 52.58 2 biotite conventional K-Ar 88 "4.72E-04, 0.584E-04, 1.19E-04*" 9.45 7.259 89 initial age disturbed by later metamorphism -60+140 MESH "K2O=9.33%, 9.38%, 9.42%, 9.47%, 9.36%, AND 9.36% (ENGELS AND OTHERS, 1976)" 6317 2 59.25 2 muscovite conventional K-Ar 88 "4.72E-04, 0.584E-04, 1.19E-04*" 10.66 9.244 91 initial age disturbed by later metamorphism -100+140 MESH "K2O=10.64%, 10.69%, 10.63%, AND 10.70% (ENGELS AND OTHERS, 1976)" 6318 1 57.85 2 biotite conventional K-Ar 89 "4.72E-04, 0.584E-04, 1.19E-04*" 9.36 7.922 90 initial age disturbed by later metamorphism -35+60 MESH "K2O=9.34% AND 9.38% (ENGELS AND OTHERS, 1976)" 6318 2 69.15 2 muscovite conventional K-Ar 89 "4.72E-04, 0.584E-04, 1.19E-04*" 10.76 10.92 76 initial age disturbed by later metamorphism "K2O=10.75% AND 10.78% (ENGELS AND OTHERS, 1976)" 6319 1 100.71 3 biotite conventional K-Ar 90 "4.72E-04, 0.584E-04, 1.19E-04*" 8.41 12.54 92 age of intrusion -35+60 MESH "K2O=8.40% AND 8.41% (ENGELS AND OTHERS, 1976)" "ZIRCON FROM THIS ROCK GAVE A LEAD-ALPHA AGE OF 99 M.Y. (LARSON AND OTHERS, 1958)" 6319 2 98.8 3 hornblende conventional K-Ar 90 "4.72E-04, 0.584E-04, 1.19E-04*" 0.686 1.003 80 age of intrusion "K2O=0.682% AND 0.689% (ENGELS AND OTHERS, 1976)" 6320 1 60.49 2 biotite conventional K-Ar 91 "4.72E-04, 0.584E-04, 1.19E-04*" 7.9 6.996 54 initial age disturbed by later metamorphism -60+80 MESH "K2O=7.87% AND 7.92% (ENGELS AND OTHERS, 1976)" 6320 2 86.41 2 muscovite conventional K-Ar 91 "4.72E-04, 0.584E-04, 1.19E-04*" 10.72 13.66 89 initial age disturbed by later metamorphism -60+80 MESH "K2O=10.72% AND 10.73% (ENGELS AND OTHERS, 1976)" 6321 1 74.82 2 biotite conventional K-Ar 92 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 9.568 70 initial age disturbed by later metamorphism -60+140 MESH "K2O=8.61% AND 8.63% (ENGELS AND OTHERS, 1976)" 6321 2 91.18 6 muscovite conventional K-Ar 92 "4.72E-04, 0.584E-04, 1.19E-04*" 10.68 14.38 86 initial age disturbed by later metamorphism -140+200 MESH "K2O=10.67%, 10.69%, 10.66%, AND 10.69% (ENGELS AND OTHERS, 1976)" 6337 1 546.15 hornblende conventional K-Ar 799H "4.72E-04, 0.584E-04, 1.19E-04*" 0.361 3.315 77 initial age disturbed by later metamorphism HORNBLENDE PLUS 10% PLAGIOCLASE AND 5% QUARTZ K=0.295% AND 0.304% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR SAMPLES IN THIS ARTICLE HAVE BEEN SUPERCEDED BY ARMSTRONG (1976, ISOCHRON/WEST, NO. 15, P. 12-31); THE CHANGES ARE MINOR; MANY NEW SAMPLES ARE LISTED" 6339 1 59.57 1.7 biotite conventional K-Ar 2. YU-873 "4.72E-04, 0.584E-04, 1.19E-04*" 8.97 7.822 83 age of metamorphic crystallization "K=7.56%, 7.42%, AND 7.38%" THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6339 2 65.29 1.9 muscovite conventional K-Ar 2. YU-873 "4.72E-04, 0.584E-04, 1.19E-04*" 9.71 9.294 70 age of metamorphic crystallization K=8.02% AND 8.10% THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6340 1 72.28 2.1 biotite conventional K-Ar 3. YU-874 "4.72E-04, 0.584E-04, 1.19E-04*" 3.56 3.78 46 maximum age of volcanism 15% CHLORITE PRESENT K=2.96% AND 2.95% 6341 1 43.33 1.3 biotite conventional K-Ar 4. YU-860 "4.72E-04, 0.584E-04, 1.19E-04*" 7.54 4.761 37 maximum age of volcanism 9% CHLORITE PRESENT K=6.26% AND 6.26% THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6342 1 39.35 1.1 biotite conventional K-Ar 5. YU-861 "4.72E-04, 0.584E-04, 1.19E-04*" 9.16 5.247 63 maximum age of volcanism K=7.67% AND 7.53% THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6343 1 38.9 1.1 biotite conventional K-Ar 6. YU-865 "4.72E-04, 0.584E-04, 1.19E-04*" 8.52 4.823 72 maximum age of volcanism K=7.10% AND 7.05% THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6344 1 38.4 1.3 biotite conventional K-Ar 7. YU-868 "4.72E-04, 0.584E-04, 1.19E-04*" 8.45 4.725 53 maximum age of volcanism K=6.97% AND 7.06% THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6345 1 37.11 1.1 whole rock conventional K-Ar 8. YU-870 "4.72E-04, 0.584E-04, 1.19E-04*" 4.78 2.58 49 K=3.94% AND 4.00% AGE MAY REFLECT MOVEMENT ON THE FAULT. THIS AGE ALSO REPORTED BY ARMSTRONG AND OTHERS (1974) 6346 1 47.34 0.5 whole rock conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 4.64 3.204 54 THE AGE APPARENTLY REFLECTS AN EOCENE THERMAL EVENT 6347 1 47.88 0.6 whole rock conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 2.87 2.005 35 THE AGE APPARENTLY REFLECTS AN EOCENE THERMAL EVENT 6348 1 61.39 1.4 whole rock conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 4.43 3.983 53 initial age disturbed by later metamorphism 6349 1 193.87 2 whole rock conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 3.94 11.61 63 initial age disturbed by later metamorphism 6350 1 95.85 5 hornblende conventional K-Ar 18. L-62-327A "4.72E-04, 0.585E-04, 1.19E-04*" 1.51 2.14 72 age of later metamorphism "INITIAL AGE IS PROBABLY ABOUT 600 M.Y. (SEE LEONARD AND STERN, 1966); THIS AGE ALSO REPORTED BY LEONARD AND STERN, 1966" 6352 1 267.63 8 whole rock conventional K-Ar 30. YU-787 "4.72E-04, 0.584E-04, 1.19E-04*" 1.94 8.058 12 age not evaluated K=1.63% AND 1.59% 6353 1 347.4 10 whole rock conventional K-Ar 31. YU-880 "4.72E-04, 0.584E-04, 1.19E-04*" 1.94 10.7 19 "sample contains excess radiogenic argon, age is too old" MUSCOVITE WELL RECRYSTALLIZED K=1.62% AND 1.60% ARMSTRONG STATES THAT SPECIMEN IS FROM EXCESS-AR HALO OF IDAHO BATHOLITH 6354 1 337.35 10 whole rock conventional K-Ar 32. YU-879 "4.72E-04, 0.584E-04, 1.19E-04*" 4.14 22.11 90 "sample contains excess radiogenic argon, age is too old" MUSCOVITE WELL RECRYSTALLIZED K=3.47% AND 3.40% ARMSTRONG STATES THAT SPECIMEN IS FROM EXCESS-AR ZONE OR HALO OF IDAHO BATHOLITH 6355 1 399.69 12 whole rock conventional K-Ar 33. YU-878 "4.72E-04, 0.584E-04, 1.19E-04*" 3.42 22.03 88 "sample contains excess radiogenic argon, age is too old" MUSCOVITE WELL RECRYSTALLIZED "K=2.83%, 2.85%, AND 2.83%" ARMSTRONG STATES THAT THE SPECIMEN IS FROM EXCESS-AR HALO OF IDAHO BATHOLITH 6356 1 334.54 4 whole rock conventional K-Ar 36. 69-7-2B "4.72E-04, 0.585E-04, 1.19E-04*" 3.53 18.68 89 initial age disturbed by weathering 6357 1 951.83 28 whole rock conventional K-Ar 37. YU-1024 "4.72E-04, 0.584E-04, 1.19E-04*" 0.21 3.79 9081 "sample contains excess radiogenic argon, age is too old" K=0.176% AND 0.173% 6357 2 769.59 24 chlorite group conventional K-Ar 37. YU-1024 "4.72E-04, 0.584E-04, 1.19E-04*" 0.011 0.152 5 "sample contains excess radiogenic argon, age is too old" K=0.009% AND 0.009% 6358 1 666.11 20 whole rock conventional K-Ar 38. YU-1025 "4.72E-04, 0.584E-04, 1.19E-04*" 0.045 0.522 40 "sample contains excess radiogenic argon, age is too old" K=0.037% AND 0.037% 6358 2 478.02 14 actinolite conventional K-Ar 38. YU-1025 "4.72E-04, 0.584E-04, 1.19E-04*" 0.025 0.197 1311 "sample contains excess radiogenic argon, age is too old" ACTINOLITE-CHLORITE MIXTURE K=0.021% AND 0.021%; 40AR(RAD)=0.425 AND 0.460XE-6 CC/GM 6359 1 284.15 4 sericite conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 6.64 29.42 9898 initial age disturbed by later metamorphism K=5.52% AND 5.51%; 40AR(RAD)=65.53 AND 66.34XE-6 CC/GM "THIS AGE ALSO REPORTED BY SORENSEN (1972, P. 42)" 6360 1 517.48 15 sericite conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 3.77 32.53 90 "MAY BE THE APPROXIMATE TIME OF ALTERATION. THIS AGE ALSO REPORTED BY SORENSEN (1972, P.42)" 6361 1 548.7 16 sericite conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 4.47 41.27 97 initial age disturbed by later metamorphism SERICITE IN BEDDING PLANES "THIS AGE ALSO REPORTED BY SORENSEN (1972, P.42)" 6362 1 519.16 6 whole rock conventional K-Ar 42. 69-7-5A "4.72E-04, 0.585E-04, 1.19E-04*" 4.04 34.99 88 initial age disturbed by later metamorphism 6363 1 1044.42 12 whole rock conventional K-Ar 43. 69-7-4C "4.72E-04, 0.585E-04, 1.19E-04*" 4.48 91.24 96 maximum age of volcanism 6365 1 1133.07 40 hornblende conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 1 22.7 94 age of intrusion HORNBLENDE-PYROXENE MIXTURE "THIS AGE REPORTED BY SORENSEN (1972, P.26)" 6366 1 572.93 14 whole rock conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.46 4.466 64 minimum age of intrusion "THIS AGE ALSO REPORTED BY SORENSEN (1972, P.26)" 6379 1 451.71 15 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 7.72 57.05 9192 age of intrusion K=6.32% AND 6.50%; 40AR(RAD)=0.230 AND 0.226 PPM 6387 1 55.75 1.6 biotite conventional K-Ar 7. YU-798 "4.72E-04, 0.584E-04, 1.19E-04*" 7.11 5.796 80 initial age disturbed by later metamorphism BIOTITE-CHLORITE(12%) MIXTURE K=5.95% AND 5.85% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6388 1 133.41 4 biotite conventional K-Ar 9. YU-799 "4.72E-04, 0.584E-04, 1.19E-04*" 6.23 12.42 81 initial age disturbed by later metamorphism BIOTITE-CHLORITE(30%) MIXTURE K=5.18% AND 5.17% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6389 1 544.87 16 hornblende conventional K-Ar 8. YU-799H "4.72E-04, 0.584E-04, 1.19E-04*" 0.361 3.306 77 initial age disturbed by later metamorphism HORNBLENDE WITH 10% PLAGIOCLASE AND 5% QUARTZ "K=0.295%, 0.304%, AND 0.300%" "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6390 1 78.01 2.3 biotite conventional K-Ar 10. YU-800 "4.72E-04, 0.584E-04, 1.19E-04*" 8.11 9.308 88 initial age disturbed by later metamorphism BIOTITE-CHLORITE(12%) MIXTURE "K=6.73%, 6.58%, AND 6.88%" "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6392 1 53.73 1.6 biotite conventional K-Ar 11. YU-802 "4.72E-04, 0.584E-04, 1.19E-04*" 8.99 7.059 85 initial age disturbed by later metamorphism K=7.44% AND 7.49% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6393 1 44.54 1.3 biotite conventional K-Ar 12. YU-803 "4.72E-04, 0.585E-04, 1.19E-04*" 7.08 4.596 72 initial age disturbed by later metamorphism BIOTITE WITH 17% CHLORITE AND KAOLINITE "K=5.86%, 5.88%, AND 5.90%" "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6394 1 68.66 2 biotite conventional K-Ar 13. YU-822 "4.72E-04, 0.584E-04, 1.19E-04*" 8.49 8.554 83 initial age disturbed by later metamorphism K=7.06% AND 7.03% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6395 1 23.47 0.6 biotite conventional K-Ar 14. YU-951 "4.72E-04, 0.584E-04, 1.19E-04*" 8.75 2.976 73 initial age disturbed by later metamorphism K=7.29% AND 7.23% 6399 1 420.29 12 hornblende conventional K-Ar 16. YU-833A "4.72E-04, 0.584E-04, 1.19E-04*" 0.317 2.16 79 initial age disturbed by later metamorphism IMPURE HORNBLENDE CONCENTRATE K=0.265% AND 0.262% 6400 1 814.17 24 hornblende conventional K-Ar 16. YU-833B "4.72E-04, 0.584E-04, 1.19E-04*" 0.322 4.77 60 initial age disturbed by later metamorphism IMPURE HORNBLENDE CONCENTRATE K=0.276% AND 0.258% 6401 1 1004.33 30 hornblende conventional K-Ar 16. YU-833C "4.72E-04, 0.584E-04, 1.19E-04*" 0.354 6.849 82 initial age disturbed by later metamorphism IMPURE HORNBLENDE CONCENTRATE K=0.285% AND 0.302% 6402 1 31.36 0.9 muscovite conventional K-Ar 3. YU-804 "4.72E-04, 0.584E-04, 1.19E-04*" 11.07 5.042 72 initial age disturbed by later metamorphism K=9.20% AND 9.18% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6403 1 39.7 1.3 muscovite conventional K-Ar 4. YU-806 "4.72E-04, 0.584E-04, 1.19E-04*" 7.44 4.3 81 initial age disturbed by later metamorphism MUSCOVITE WITH 10% QUARTZ AND 2% CHLORITE K=5.64% AND 6.72% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6404 1 25.6 0.8 muscovite conventional K-Ar 5. YU-819 "4.72E-04, 0.584E-04, 1.19E-04*" 10.91 4.05 84 initial age disturbed by later metamorphism K=9.10% AND 9.01% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6405 1 28.51 0.8 muscovite conventional K-Ar 6. YU-823 "4.72E-04, 0.584E-04, 1.19E-04*" 9.38 3.88 72 initial age disturbed by later metamorphism "K=7.65%, 7.86%, AND 7.87%" "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6406 1 75.24 2 biotite conventional K-Ar 14. YU-ALB-1757 "4.72E-04, 0.584E-04, 1.19E-04*" 9.02 9.977 77 initial age disturbed by later metamorphism FINE BIOTITE K=7.49% AND 7.48% 6406 2 83.47 2.5 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 10.7 15 initial age disturbed by later metamorphism COARSE BIOTITE K=7.23% AND 7.22% 6407 1 75.22 2 biotite conventional K-Ar 2. YU-ALB-298 "4.72E-04, 0.584E-04, 1.19E-04*" 8.36 9.245 72 initial age disturbed by later metamorphism BIOTITE-MUSCOVITE MIXTURE PLUS 5% CHLORITE "K=6.88%, 6.89%, AND 7.05%" "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6408 1 76.75 2 whole rock conventional K-Ar 7. YU-ALB-461 "4.72E-04, 0.584E-04, 1.19E-04*" 3.57 4.03 76 initial age disturbed by later metamorphism K=2.98% AND 2.95% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6409 1 29.53 0.9 phlogopite conventional K-Ar 8. YU-ALB-285 "4.72E-04, 0.584E-04, 1.19E-04*" 7.98 3.42 69 initial age disturbed by later metamorphism K=6.60% AND 6.65% 6410 1 28.02 0.8 muscovite conventional K-Ar 9. YU-ALB-1005 "4.72E-04, 0.584E-04, 1.19E-04*" 9.47 3.85 79 initial age disturbed by later metamorphism K=7.85% AND 7.88% 6411 1 67.81 2 whole rock conventional K-Ar 10. YU-ALB-1290 "4.72E-04, 0.584E-04, 1.19E-04*" 1.95 1.94 7674 initial age disturbed by later metamorphism K=1.63% AND 1.61%; 40AR(RAD)=4.38 AND 4.30XE-6 CC/GM 6412 1 25.95 0.8 whole rock conventional K-Ar 11. YU-ALB-1361 "4.72E-04, 0.584E-04, 1.19E-04*" 4.89 1.84 65 initial age disturbed by later metamorphism K=4.05% AND 4.07% 6413 1 73.66 2 hornblende conventional K-Ar 12. YU-ALB-1408 "4.72E-04, 0.584E-04, 1.19E-04*" 0.376 0.407 37 initial age disturbed by later metamorphism K=0.310% AND 0.315% 6414 1 25.1 2 muscovite conventional K-Ar 13. YU-ALB-1446 "4.72E-04, 0.584E-04, 1.19E-04*" 10.22 3.72 45 initial age disturbed by later metamorphism K=8.50% AND 8.47% 6415 1 36.94 1 whole rock conventional K-Ar 15. YU-ALB-1871C "4.72E-04, 0.584E-04, 1.19E-04*" 3.22 1.73 73 initial age disturbed by later metamorphism K=2.67% AND 2.67% 6416 1 33.53 1 biotite conventional K-Ar 16. YU-ALB-1879 "4.72E-04, 0.584E-04, 1.19E-04*" 8.64 4.21 6458 initial age disturbed by later metamorphism K=7.15% AND 7.19%; 40AR(RAD)=9.53 AND 9.33XE-6 CC/GM 6417 1 72.16 2 biotite conventional K-Ar 17. YU-ALB-2115 "4.72E-04, 0.584E-04, 1.19E-04*" 6.26 6.635 61 initial age disturbed by later metamorphism BIOTITE-CHLORITE MIXTURE K=5.23% AND 5.17% 6418 1 32.1 0.9 whole rock conventional K-Ar 18. YU-ALB-2121 "4.72E-04, 0.584E-04, 1.19E-04*" 2.96 1.38 63 initial age disturbed by later metamorphism K=2.45% AND 2.46% 6419 1 165.08 5 hornblende conventional K-Ar 19. YU-ALB-2262 "4.72E-04, 0.584E-04, 1.19E-04*" 0.313 0.779 5555 K=0.259% OR 0.260%; 40AR(RAD)=1.67 AND 1.82XE-6 CC/GM A MINIMUM AGE FOR THE METAMORPHIC EVENT OR A SPURIOUS AGE 6420 1 21.14 0.6 biotite conventional K-Ar 5. YU-795 "4.72E-04, 0.584E-04, 1.19E-04*" 8.69 2.66 56 initial age disturbed by later metamorphism K=7.15% AND 7.27% AGE INDICATES A MIOCENE THERMAL EVENT 6421 1 19.47 0.6 biotite conventional K-Ar 6. YU-942 "4.72E-04, 0.584E-04, 1.19E-04*" 8.87 2.5 45 initial age disturbed by later metamorphism K=7.43% AND 7.30% AGE INDICATES A MIOCENE THERMAL EVENT 6422 1 19.91 0.6 muscovite conventional K-Ar 7. YU-943 "4.72E-04, 0.584E-04, 1.19E-04*" 8.57 2.47 58 initial age disturbed by later metamorphism K=7.17% AND 7.05% AGE INDICATES A MIOCENE THERMAL EVENT 6422 2 19.38 0.6 biotite conventional K-Ar 7. YU-943 "4.72E-04, 0.584E-04, 1.19E-04*" 8.52 2.39 67 initial age disturbed by later metamorphism K=7.05% AND 7.10% AGE INDICATES A MIOCENE THERMAL EVENT 6423 1 17.96 0.5 biotite conventional K-Ar 8. YU-945 "4.72E-04, 0.584E-04, 1.19E-04*" 8.12 2.11 68 initial age disturbed by later metamorphism K=6.69% AND 6.79% AGE INDICATES A MIOCENE THERMAL EVENT 6424 1 16.56 0.5 muscovite conventional K-Ar 9. YU-947 "4.72E-04, 0.584E-04, 1.19E-04*" 9.81 2.35 48 initial age disturbed by later metamorphism K=8.12% AND 8.16% AGE INDICATES A MIOCENE THERMAL EVENT 6425 1 18.14 0.5 muscovite conventional K-Ar 10. YU-948 "4.72E-04, 0.584E-04, 1.19E-04*" 10.44 2.74 56 initial age disturbed by later metamorphism K=8.75% AND 8.58% AGE INDICATES A MIOCENE THERMAL EVENT 6426 1 19.11 0.6 biotite conventional K-Ar 11. YU-949 "4.72E-04, 0.584E-04, 1.19E-04*" 8.82 2.44 69 initial age disturbed by later metamorphism K=7.35% AND 7.30% AGE INDICATES A MIOCENE THERMAL EVENT 6427 1 19.8 0.6 biotite conventional K-Ar 12. YU-950 "4.72E-04, 0.584E-04, 1.19E-04*" 9.07 2.6 66 initial age disturbed by later metamorphism K=7.55% AND 7.50% AGE INDICATES A MIOCENE THERMAL EVENT 6428 1 19.62 0.6 muscovite conventional K-Ar 17. YU-941 "4.72E-04, 0.584E-04, 1.19E-04*" 9.93 2.82 57 K=8.23% AND 8.25% AGE INDICATES A MIOCENE THERMAL EVENT 6429 1 20.46 0.6 muscovite conventional K-Ar 18. YU-944 "4.72E-04, 0.584E-04, 1.19E-04*" 10.26 3.04 63 K=8.60% AND 8.43% AGE INDICATES A MIOCENE THERMAL EVENT 6430 1 21.17 0.6 muscovite conventional K-Ar 19. YU-946 "4.72E-04, 0.584E-04, 1.19E-04*" 9.46 2.9 61 K=7.83% AND 7.87% AGE INDICATES A MIOCENE THERMAL EVENT 6431 1 21.35 0.6 biotite conventional K-Ar 7. YU-936 "4.72E-04, 0.584E-04, 1.19E-04*" 8.96 2.77 48 K=7.37% AND 7.51% AGE INDICATES A MIOCENE THERMAL EVENT 6432 1 19.08 0.6 biotite conventional K-Ar 9. YU-937 "4.72E-04, 0.584E-04, 1.19E-04*" 7.75 2.14 45 K=6.50% AND 6.37% AGE INDICATES A MIOCENE THERMAL EVENT 6433 1 21.43 0.6 biotite conventional K-Ar 9. YU-938 "4.72E-04, 0.584E-04, 1.19E-04*" 8.44 2.62 68 K=7.05% AND 6.97% AGE INDICATES A MIOCENE THERMAL EVENT 6433 2 29.4 0.9 muscovite conventional K-Ar 9. YU-938 "4.72E-04, 0.584E-04, 1.19E-04*" 9.21 3.93 51 initial age disturbed by later metamorphism K=7.69% AND 7.60% 6434 1 20.72 0.6 biotite conventional K-Ar 10. YU-939 "4.72E-04, 0.584E-04, 1.19E-04*" 8.6 2.58 49 K=7.15% AND 7.13% AGE INDICATES A MIOCENE THERMAL EVENT 6434 2 25.3 0.7 muscovite conventional K-Ar 10. YU-939 "4.72E-04, 0.584E-04, 1.19E-04*" 9.46 3.47 67 initial age disturbed by later metamorphism K=7.85% AND 7.86% 6436 1 22.12 0.6 muscovite conventional K-Ar 11. YA-940 "4.72E-04, 0.584E-04, 1.19E-04*" 10.08 3.23 42 initial age disturbed by later metamorphism "K=8.47%, 8.28%, AND 8.35%" 6437 1 23.38 0.7 biotite conventional K-Ar 5. YU-796 "4.72E-04, 0.584E-04, 1.19E-04*" 9.27 3.14 65 K=7.67% AND 7.72% A COOLING AGE 6438 1 22.07 0.6 biotite conventional K-Ar 6. YU-797 "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 2.65 55 K2O=6.92% AND 6.84% "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6438 2 25.12 0.7 muscovite conventional K-Ar 6. YU-797 "4.72E-04, 0.584E-04, 1.19E-04*" 10.49 3.82 65 K=8.70% AND 8.72% "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6440 1 21.39 0.6 biotite conventional K-Ar 7. YU-814 "4.72E-04, 0.584E-04, 1.19E-04*" 8.75 2.71 58 K=7.24% AND 7.29% "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6441 1 23.84 0.7 muscovite conventional K-Ar 8. YU-816 "4.72E-04, 0.584E-04, 1.19E-04*" 10.45 3.61 38 K=8.73% AND 8.62% "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6443 1 25.03 0.7 muscovite conventional K-Ar 9. YU-817 "4.72E-04, 0.584E-04, 1.19E-04*" 10.28 3.73 54 K=8.60% AND 8.46% "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6443 2 16.4 0.5 biotite conventional K-Ar 9. YU-817 "4.72E-04, 0.584E-04, 1.19E-04*" 6.45 1.53 3235 age not evaluated BIOTITE WITH 8% CHLORITE K=5.38% AND 5.32%; 40AR(RAD)=3.39 AND 3.45XE-6 CC/GM 6444 1 23.01 0.6 biotite conventional K-Ar 10. YU-820 "4.72E-04, 0.584E-04, 1.19E-04*" 8.82 2.94 56 "K=7.47%, 7.19%, AND 7.31%" "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6445 1 21.27 0.6 biotite conventional K-Ar 11. YU-821 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 2.68 58 K=7.19% AND 7.25% "A COOLING AGE. THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6445 2 24.76 0.7 muscovite conventional K-Ar 11. YU-821 "4.72E-04, 0.584E-04, 1.19E-04*" 9.78 3.51 56 K=8.14% AND 8.09% A COOLING AGE 6447 1 20.69 0.6 biotite conventional K-Ar 12. YU-ALB2235 "4.72E-04, 0.584E-04, 1.19E-04*" 8.01 2.4 58 K=6.58% AND 6.71% A COOLING AGE 6449 1 24.59 0.7 muscovite conventional K-Ar 13. YU-813 "4.72E-04, 0.584E-04, 1.19E-04*" 10.55 3.76 82 minimum age of intrusion K=8.75% AND 8.76% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6449 2 28.24 0.8 orthoclase conventional K-Ar 13. YU-813 "4.72E-04, 0.584E-04, 1.19E-04*" 13.09 5.363 77 maximum age of intrusion K=10.85% AND 10.88% 6450 1 25.4 0.7 muscovite conventional K-Ar 15. YU-815 "4.72E-04, 0.584E-04, 1.19E-04*" 10.67 3.93 58 minimum age of intrusion K=8.86% AND 8.85% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6450 2 32.7 1 microcline conventional K-Ar 15. YU-815 "4.72E-04, 0.584E-04, 1.19E-04*" 12.29 5.839 6777 K=10.13% AND 10.27%; 40AR(RAD)=13.03 AND 13.14XE-6 CC/GM AGE APPEARS TOO OLD 6451 1 25.93 0.8 muscovite conventional K-Ar 16. YU-818 "4.72E-04, 0.584E-04, 1.19E-04*" 10.53 3.96 86 age of intrusion K=8.78% AND 8.70% "THE AGE, ANALYTICAL DATA, AND LOCATION FOR THIS SAMPLE AS REPORTED BY ARMSTRONG AND HILLS (1967) ARE SUPERCEDED BY THE ABOVE" 6451 2 25.3 0.7 microcline conventional K-Ar 16. YU-818 "4.72E-04, 0.584E-04, 1.19E-04*" 12.98 4.761 66 age of intrusion K=11.02% AND 10.53% 6478 1 62.99 2.2 whole rock conventional K-Ar WHITE CLOUD "4.72E-04, 0.585E-04, 1.19E-04*" 0.389 0.359 70 -30 +70 MESH K=0.323% BY ISOTOPE DILUTION AGE OF MINERALIZATION 6479 1 60.53 2.1 muscovite conventional K-Ar CANNIVAN "4.72E-04, 0.585E-04, 1.19E-04*" 11.318 10.03 80 K=9.395% BY ISOTOPE DILUTION AGE OF MINERALIZATION 6480 1 42.41 1.4 muscovite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04*" 11.13 6.876 79 age of intrusion K=9.24% AGE MAY ALSO DATE THE MINERALIZATION 6481 1 66.8 2.5 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion PRIMARY ROCK BIOTITE NO ANALYTICAL DATA GIVEN 6482 1 68 2.5 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion PRIMARY ROCK BIOTITE NO ANALYTICAL DATA GIVEN 6483 1 62.5 2.3 muscovite conventional K-Ar (NOT GIVEN) no decay constants given COARSE HYDROTHERMAL MUSCOVITE NO ANALYTICAL DATA GIVEN PROBABLE AGE OF MINERALIZATION 6484 1 55.3 2 adularia conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN TIME OF MINERALIZATION--THIS AGE MAY BE LOW. ARMSTRONG AND OTHERS (1978) REPORTED AN AGE OF 59.1 M.Y. FOR TIME OF MINERALIZATION. 6543 1 106.96 4 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.81 1.285 87 age of intrusion K2O=0.811% AND 0.809% (ISOTOPE DILUTION) 6544 1 133.83 6 hornblende conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.63 3.26 age of intrusion K=1.353% 6545 1 98.52 4 whole rock conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 1.946 2.837 age of intrusion K=1.615% 6546 1 184.68 8 whole rock conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 1.128 3.158 age of intrusion K=0.936% 6547 1 420.45 15 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 3.242 22.1 age of intrusion K=2.691% (APPEARS TO BE AN IMPURE BIOTITE --COMPILER) 6548 1 124.79 5 whole rock conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 1.337 2.487 age of intrusion K=1.110% 6549 1 188.53 8 whole rock conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 1.534 4.389 age of intrusion K=1.273% 6550 1 205.28 9 whole rock conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 1.076 3.368 age of intrusion K=0.893% 6551 1 162.19 6 whole rock conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 2.078 5.077 age of intrusion K=1.725% 6552 1 127.05 6 whole rock conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.982 1.861 age of intrusion K=0.815% 6553 1 191 10 whole rock conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 6554 1 49 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN "THIS AGE IS PROBABLY FROM CHADWICK, 1969 (BIOTITE AGE) --COMPILER" 6555 1 1756.06 31.5 biotite conventional K-Ar PR.69.157 "4.72E-04, 0.585E-04, 1.19E-04*" 6.415 274.4 9999 age of later metamorphism K=5.33% AND 5.32%; 40AR=6.3192 AND 5.9783XE-4/G 6557 1 1714.4 23.8 biotite conventional K-Ar PW.68.124 "4.72E-04, 0.585E-04, 1.19E-04*" 5.89 242.7 9999 age of later metamorphism K=4.88% AND 4.90%; 40AR=5.4964 AND 5.3805XE-4/G 6558 1 1668.62 14.3 biotite conventional K-Ar PR.69.158 "4.72E-04, 0.585E-04, 1.19E-04*" 2.596 102.6 9999 age of later metamorphism K=2.15% AND 2.16%; 40AR=2.3281 AND 2.2688XE-4/G 6559 1 2182.94 60.3 biotite conventional K-Ar PW.68.59 "4.72E-04, 0.585E-04, 1.19E-04*" 4.7 287.3 9999 minimum age of metamorphic crystallization K=3.90% AND 3.90%; 40AR=6.7386 AND 6.1400XE-4/G 6560 1 2170 110 whole rock conventional K-Ar PR.69.61 "4.72E-04, 0.585E-04, 1.19E-04*" 0.596 36.1 98 initial age disturbed by later metamorphism K=0.50% AND 0.49%; 40AR=8.1596 AND 8.0197XE-4/G 6561 1 4772.25 153.1 whole rock conventional K-Ar PJ.69.15 "4.72E-04, 0.585E-04, 1.19E-04*" 1.08 367.1 9999 K=0.89% AND 0.90%; 40AR=8.9491 AND 7.5069XE-4/G SPURIOUS AGE; EXCESS ARGON PRESENT 6562 1 1639.53 54 biotite conventional Rb-Sr (assumed initial 87Sr/86Sr) PW.70.74 "4.72E-04, 0.585E-04, 1.19E-04*" 8.772 337.5 9894 age of later metamorphism K=7.276% AND 7.288%; 40AR=1.337 AND 1.360 PPM 6563 1 977.76 33 whole rock conventional K-Ar PJ.69.33.1 "4.72E-04, 0.585E-04, 1.19E-04*" 5.673 106 9796 age not evaluated K=4.718% AND 4.701%; 40AR=0.424 AND 0.423 PPM 6564 1 1707.4 72 amphiboles conventional K-Ar PR.69.84 "4.72E-04, 0.585E-04, 1.19E-04*" 0.825 33.78 9094 age of later metamorphism K=0.688% AND 0.682%; 40AR=0.131 AND 0.139 PPM 6565 1 2067.88 99 amphiboles conventional K-Ar PW.69.103 "4.72E-04, 0.585E-04, 1.19E-04*" 0.543 30.27 9482 initial age disturbed by later metamorphism K=0.453% AND 0.450%; 40AR=0.124 AND 0.118 PPM 6566 1 1186.06 48 whole rock conventional K-Ar PR.69.217 "4.72E-04, 0.585E-04, 1.19E-04*" 1.036 25.02 8480 "minimum age of metamorphic crystallization, initial age disturbed by later metamorphism" K=0.860% AND 0.860%; 40AR=0.0974 AND 0.103 PPM 6567 1 1862.94 61 biotite conventional K-Ar PW.69.107 "4.72E-04, 0.585E-04, 1.19E-04*" 9.606 451.2 9596 initial age disturbed by later metamorphism K=7.960% AND 7.989%; 40AR=1.821 AND 1.786 PPM 6568 1 1269.61 47 whole rock conventional K-Ar PR.69.115.1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.88 49.87 989485 "K=1.563% AND 1.559%; 40AR=0.201, 0.189, AND 0.208 PPM" MAXIMUM AGE FOR THE FAULTING 6569 1 1711.74 62 biotite conventional K-Ar PR.69.22 "4.72E-04, 0.585E-04, 1.19E-04*" 2.106 86.57 9492 "age of later metamorphism, initial age disturbed by later metamorphism" K=1.710% AND 1.786%; 40AR=0.352 AND 0.339 PPM 6570 1 2454.24 124 whole rock conventional K-Ar PW.70.70A "4.72E-04, 0.585E-04, 1.19E-04*" 0.477 35.9 9494 age of intrusion K=0.400 AND 0.393%; 40AR=0.143 AND 0.144 PPM 6571 1 1448.25 75 whole rock conventional K-Ar PR.69.134 "4.72E-04, 0.585E-04, 1.19E-04*" 0.452 14.46 8084 K=0.378% AND 0.372%; 40AR=0.0574 AND 0.0582 PPM INITIAL AGE HAS BEEN DISTURBED BY FAULTING 6572 1 1711.92 57 biotite conventional Rb-Sr (assumed initial 87Sr/86Sr) PR.69.140.1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.905 325 9998 "age of later metamorphism, initial age disturbed by later metamorphism" K=6.549% AND 6.575%; 40AR=1.299 AND 1.299 PPM 6573 1 1562.68 67 whole rock conventional K-Ar PW.69.109 "4.72E-04, 0.585E-04, 1.19E-04*" 0.769 27.52 8991 K=0.640% AND 0.637%; 40AR=0.107 AND 0.113 PPM INITIAL AGE HAS BEEN DISTURBED BY FAULTING 6574 1 730 whole rock conventional K-Ar BT-35 "4.72E-04, 0.585E-04, 1.19E-04" 1.16 95 age of intrusion 6575 1 40.8 1.3 biotite conventional K-Ar 443-14 "4.72E-04, 0.577E-04*" 8.29 4.92 40 Miller (1973) age of intrusion "35-150 MESH, 3% IMPURITIES" K=6.88% "YOUNGEST IGNEOUS ACTIVITY IN THE AREA, IF AGE IS A PRIMARY AGE" 6575 2 41.8 biotite conventional K-Ar 443-14 "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 5.049 82 age of intrusion "35-150 MESH, 3% IMPURITIES" K=6.88% 6576 1 49.5 biotite conventional K-Ar 443-3 "4.72E-04, 0.577E-04*" 8.38 6.056 73 Miller (1973) age of intrusion "35-150 MESH, AROUND 3% IMPURITIES" K=6.96% 6577 1 56.4 1.7 biotite conventional K-Ar 443-19 "4.72E-04, 0.577E-04*" 8.02 6.615 76 "35-60 MESH, LESS THAN 3% CHLORITE" K=6.66% AGE TOO YOUNG; SAMPLE NOT COMPLETELY DEGASSED DURING ANALYSIS 6577 2 60.8 biotite conventional K-Ar 443-19 "4.72E-04, 0.577E-04*" 8.58 7.633 72 minimum age of intrusion "35-150 MESH, LESS THAN 5% CHLORITE" K=7.12% 6578 1 58.7 1.8 sericite conventional K-Ar 443-12 "4.72E-04, 0.577E-04*" 5.87 5.045 62 Miller (1973) 150-200 MESH K=4.87% TIME OF HYDROTHERMAL ACTIVITY 6578 2 58.9 1.8 sericite conventional K-Ar 443-12 "4.72E-04, 0.577E-04*" 5.87 5.059 52 150-200 MESH K=4.87% TIME OF HYDROTHERMAL ACTIVITY 6579 1 59 sericite conventional K-Ar 443-11 "4.72E-04, 0.577E-04*" 6.47 5.585 88 LESS THAN 150 MESH K=5.37% TIME OF HYDROTHERMAL ACTIVITY 6580 1 74.9 biotite conventional K-Ar 443-4 "4.72E-04, 0.577E-04*" 7.94 8.741 84 age of intrusion 28 MESH K=6.59% 6580 2 65.3 biotite conventional K-Ar 443-4 "4.72E-04, 0.577E-04*" 7.53 7.213 73 "35-150 MESH, LESS THAN 3% HORNBLENDE AND CHLORITE" K=6.25% AGE IS TOO YOUNG 6580 3 64.1 2 biotite conventional K-Ar 443-4 "4.72E-04, 0.577E-04*" 7.53 7.08 46 "35-150 MESH, LESS THAN 5% HORNBLENDE AND CHLORITE" K=6.25% AGE TOO YOUNG 6581 1 80.7 biotite conventional K-Ar 443-10 "4.72E-04, 0.577E-04*" 6.3 7.485 89 Miller (1973) age of intrusion "35 MESH, LESS THAN 10% CHLORITE" K=5.23% 6581 2 45.2 1.4 biotite conventional K-Ar 443-10 "4.72E-04, 0.577E-04*" 4.64 3.057 37 "35-150 MESH, 40% CHLORITE" K=3.85% AGE IS TOO YOUNG 6582 1 62.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" Miller (1973) FINE-GRAINED NO ANALYTICAL DATA GIVEN "TIME OF PRIMARY., AND STAFF, 1968, ORE DEPOSITS AT BUTTE, MONTANA, ""IN"" ORE DEPOSITS IN THE UNITED STATES, 1933-1967, AIME GRATON-SALES VOLUME, NO. 2, P. 1373-1416." 6583 1 57.5 1.8 sericite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "TIME OF MINERALIZATION. AGE MAY BE AN AVERAGE OF 3 K-AR AGES (RECALCULATED)(SAMPLES 443-11 AND 443-12, WOAKES, 1960, M.S. THESIS, UNIV. CALIFORNIA, BERKELEY)" 6584 1 80.69 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 6.3 7.485 89 age of intrusion COARSE BIOTITE "K=5.23%; AR AND K VALUES ARE FROM SAMPLE 443-10, WOAKES, 1960, M.S. THESIS, UNIV. CALIFORNIA, BERKELEY" "SEE WOAKES, 1960. AGE RECALCULATED" 6585 1 40.76 1.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 4.92 40 age of intrusion 35-150 MESH 3% IMPURITIES "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-14; AGE RECALCULATED" LAST INTRUSIVE PHASE? 6585 2 41.82 1.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 5.049 82 age of intrusion "35-150 MESH, 3% IMPURITIES" "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-14; AGE RECALCULATED" LAST INTRUSIVE PHASE? 6586 1 49.51 1.5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 6.056 73 age of intrusion "35-150 MESH, AROUND 3% IMPURITIES" "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-3; AGE RECALCULATED" 6587 1 1.6 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-12; AGE RECALCULATED" TIME OF MINERALIZATION 6587 2 58.89 1.8 sericite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 5.87 5.059 52 150-200 MESH "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-12; AGE RECALCULATED" TIME OF MINERALIZATION 6588 1 58 1.6 sericite conventional K-Ar (NOT GIVEN) no decay constants given "NO ANALYTICAL DATA GIVEN; THIS SAMPLE MAY BE SAMPLE 443-11, WOAKES, 1960, BUT RECALCULATED AGE IS NOT 58 M.Y." TIME OF MINERALIZATION 6589 1 62.8 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "TIME OF FIRST PHASE OF HYDROTHERMAL ACTIVITY; THIS AGE ALSO REPORTED BY MEYER AND OTHERS, 1968" 6590 1 74.89 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.94 8.741 84 age of intrusion 28 MESH "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-4; AGE RECALCULATED" 6591 1 80.69 2.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 6.3 7.485 89 age of intrusion "ANALYTICAL DATA FROM WOAKES, 1960, SAMPLE 443-10; AGE RECALCULATED" 6592 1 1090 glauconite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 8.36 age of sedimentation PARTIALLY DISORDERED 1M-MICA POLYMORPH BY X-RAY 6593 1 42.7 2.4 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 6594 1 103.5 6.8 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN AGE MAY BE TOO OLD; THE PRESENCE OF EXCESS ARGON SEEMS PROBABLE 6595 1 84.05 4 biotite conventional K-Ar AK48 "4.76E-04, 0.589E-04, 1.18E-04*" 5.85 7.246 age of intrusion K=4.86% 6596 1 80 4 biotite conventional K-Ar AK63 "4.76E-04, 0.589E-04, 1.18E-04*" 6.54 7.702 age of intrusion K=5.43% 6597 1 49.81 3 biotite conventional K-Ar KA156 "4.76E-04, 0.589E-04, 1.18E-04*" 8.69 6.318 age of intrusion K=7.21% 6598 1 60.7 biotite conventional K-Ar 4983 "4.76E-04, 0.589E-04, 1.18E-04" age of sedimentation NO ANALYTICAL DATA GIVEN 6598 2 64.4 sanidine conventional K-Ar 4983 "4.76E-04, 0.589E-04, 1.18E-04" age of sedimentation NO ANALYTICAL DATA GIVEN 6598 3 61.1 sanidine conventional K-Ar 4983 "4.76E-04, 0.589E-04, 1.18E-04" age of sedimentation NO ANALYTICAL DATA GIVEN 6599 1 46.03 1.5 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 6.075 81 age of intrusion 6599 2 46.16 1.5 orthoclase conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.81 5.931 86 age of intrusion "MONOCLINIC BY X-RAY, LARGE OPTIC ANGLE" 6600 1 48.95 1.8 whole rock conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 6.64 4.743 94 age of intrusion 6601 1 49.69 1.8 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 9.5 6.891 89 age of intrusion 6602 1 50.67 1.9 whole rock conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 4.9 3.625 91 age of intrusion 6603 1 50.85 2 whole rock conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 3.2 2.376 79 age of intrusion 6604 1 51.8 1.5 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 6.93 87 age of intrusion 6604 2 68.88 2 orthoclase conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 9.02 9.118 97 "sample contains excess radiogenic argon, age is too old" "MONOCLINIC BY X-RAY, LARGE OPTIC ANGLE" 6605 1 52.16 2 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 6.735 92 age of intrusion 6606 1 51.62 1.9 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.54 6.438 85 age of intrusion 6607 1 47.43 1.6 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 6.054 86 age of intrusion 6607 2 46 1.5 sanidine conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 6.59 4.42 87 age of intrusion "MONOCLINIC BY X-RAY, LOW OPTIC ANGLE" 6608 1 48.4 1.8 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 5.353 91 age of intrusion 6608 2 47.38 1.7 hornblende conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 0.904 0.6248 86 age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION 6609 1 49.47 1.6 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.18 5.907 80 age of intrusion 6609 2 49.94 1.7 sanidine conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 9.94 7.247 89 age of intrusion "MONOCLINIC BY X-RAY, LOW OPTIC ANGLE" 6610 1 50.93 2.3 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 5.875 80 age of intrusion 6611 1 49.97 2 whole rock conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 4.1 2.991 84 age of intrusion 6614 1 57 1.5 biotite conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.06 6.719 82 age of intrusion 6614 2 49.7 1.5 biotite conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.1 5.876 83 age of intrusion 6614 3 64.5 1.8 orthoclase conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 8.257 93 "sample contains excess radiogenic argon, age is too old" "MONOCLINIC BY X-RAY, LARGE OPTIC ANGLE" 6614 4 67.5 2 K feldspar conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 8.336 92 "sample contains excess radiogenic argon, age is too old" 6615 1 52.12 1.7 biotite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 7.16 5.451 82 age of intrusion 6615 2 50.76 1.7 orthoclase conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 6.16 4.566 87 age of intrusion "MONOCLINIC BY X-RAY, LARGE OPTIC ANGLE" 6616 1 55.29 2.1 biotite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 8.21 6.636 91 maximum age of intrusion 6617 1 53.95 2 biotite conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 8.58 6.765 93 age of intrusion 6618 1 52.29 1.9 biotite conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 4.84 3.697 88 age of intrusion 6619 1 54.22 2 biotite conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 7.2 5.706 94 age of intrusion 6620 1 59.21 2.2 hornblende conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 0.674 0.5841 72 maximum age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION "EXCESS ARGON MAY BE PRESENT, MAKING THE AGE TOO OLD" 6621 1 54.07 2 biotite conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 8.07 6.377 88 age of intrusion 6622 1 51.8 1.9 biotite conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 6.42 4.857 90 age of intrusion 6623 1 53.79 2 biotite conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 7.74 6.084 93 age of intrusion 6624 1 54.19 2 whole rock conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 4.36 3.453 92 age of intrusion 6625 1 45.02 1.7 biotite conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 8.84 5.802 87 age of intrusion 6626 1 52.02 1.7 biotite conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 8.1 6.155 92 age of intrusion 6627 1 49.8 1.8 muscovite conventional K-Ar 29 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 6.005 89 age of intrusion 6628 1 43.53 1.3 biotite conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 8.56 5.43 93 age of intrusion 6628 2 42.4 1.2 sanidine conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 11.02 6.807 94 age of intrusion "MONOCLINIC BY X-RAY, SMALL OPTIC ANGLE" 6629 1 45.24 1.6 whole rock conventional K-Ar 31 "4.72E-04, 0.585E-04, 1.19E-04*" 4.79 3.159 96 age of intrusion 6630 1 45.94 2 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.63 1.762 93 age of volcanism K=2.18% 6631 1 45.63 2 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 7.84 5.216 96 age of volcanism K=6.51% 6632 1 47.76 2.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.51 1.749 76 maximum age of intrusion K=2.08% 6633 1 75.08 2.1 biotite conventional K-Ar DKA1888 "4.72E-04, 0.584E-04, 1.19E-04*" 8.87 9.79 90 age of intrusion K=7.36% 6633 2 73.64 2.5 hornblende conventional K-Ar DKA1893 "4.72E-04, 0.584E-04, 1.19E-04*" 0.511 0.553 63 age of intrusion K=0.424% 6634 1 75.8 2.1 biotite conventional K-Ar DKA1891 "4.72E-04, 0.584E-04, 1.19E-04*" 8.91 9.93 93 age of intrusion K=7.40% 6634 2 78.44 2.5 hornblende conventional K-Ar DKA1890 "4.72E-04, 0.584E-04, 1.19E-04*" 0.94 1.085 93 age of intrusion K=0.780% 6653 1 53.29 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.35 7.28 5735 age of intrusion BIOTITE FLAKES 10 CM ACROSS "K=7.76%, 40AR(RAD)=0.0291 AND 0.0290 PPM" 6655 1 48 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 6656 1 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 6657 1 44 Unk conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN PROBABLE AGE OF MINERALIZATION 6658 1 361 6 hornblende conventional K-Ar 71-GWL-119-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.926 5.33 93 maximum age of metamorphic crystallization 6659 1 325 6 hornblende conventional K-Ar A13-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.704 3.61 70 initial age disturbed by later metamorphism 6700 1 70.7 6.5 K feldspar conventional K-Ar KA-34 "5.023E-04, 0.552E-04*" 9.89 79 age of intrusion 20-100 MESH K=8.21%; 40AR(RAD)/40K=0.00399 AN AGE OF 71 M.Y. WAS REPORTED BY BEVERIDGE AND FOLINSBEE (1956) FOR THE SAME SAMPLE 6701 1 77.8 1.6 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 40AR(RAD)/40K=0.00464 6702 1 76.4 2.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 40AR(RAD)/40K=0.00455 6703 1 73.2 2.2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 6703 2 76 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion UPGRADED HORNBLENDE SEPARATE NO ANALYTICAL DATA GIVEN "ANALYZED BY EVERNDEN, UNIV. OF CALIFORNIA, BERKELEY" 6703 3 113 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" UPGRADED HORNBLENDE SEPARATE NO ANALYTICAL DATA GIVEN AGE TOO OLD; ANALYZED BY GEOCHRON 6703 4 81 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" maximum age of intrusion NO ANALYTICAL DATA GIVEN "ANALYZED BY EVERNDEN, UNIV. OF CALIFORNIA, BERKELEY" 6703 5 82 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" maximum age of intrusion NO ANALYTICAL DATA GIVEN "ANALYZED BY FOLINSBEE, UNIV. OF ALBERTA" 6704 1 73.5 1.4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 6705 1 70.2 1.5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 6706 1 79.43 2.4 hornblende conventional K-Ar D1564 "4.72E-04, 0.584E-04, 1.19E-04*" 0.988 1.155 90 age of volcanism 6707 1 80.62 2.4 hornblende conventional K-Ar D1567A "4.72E-04, 0.584E-04, 1.19E-04*" 0.829 0.984 94 age of volcanism 6707 2 79.43 2.4 hornblende conventional K-Ar D1567B "4.72E-04, 0.584E-04, 1.19E-04*" 0.834 0.975 95 age of volcanism 6708 1 106 6 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 6709 1 80.04 3.1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 8.75 10.31 89 age of intrusion "SAMPLE 63K-350 (SEE TILLING, KLEPPER, OBRADOVICH, 1968)" "SEE TILLING, KLEPPER, OBRADOVICH, 1968, FOR ANALYTICAL DATA" "AGE ALSO REPORTED BY TILLING, KLEPPER, OBRADOVICH, 1968" 6710 1 76.17 4 biotite conventional K-Ar 312B "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 9.207 83 minimum age of volcanism 6710 2 76.01 4 plagioclase conventional K-Ar 312P "4.72E-04, 0.585E-04, 1.19E-04*" 1.155 1.291 92 age of volcanism K2O=1.11% AND 1.20% 6710 3 23.44 7 glass conventional K-Ar 312G "4.72E-04, 0.585E-04, 1.19E-04*" 3.345 1.136 63 K2O=3.32% AND 3.37% AGE TOO YOUNG DUE TO DIFFUSION OF ARGON FROM THE GLASS 6710 4 22.04 7 glass conventional K-Ar 312G "4.72E-04, 0.585E-04, 1.19E-04*" 3.345 1.068 30 K2O=3.32% AND 3.37% AGE TOO YOUNG DUE TO DIFFUSION OF ARGON FROM THE GLASS 6710 5 19.77 2 glass conventional K-Ar 312G "4.72E-04, 0.585E-04, 1.19E-04*" 3.26 0.9332 19 AGE TOO YOUNG DUE TO DIFFUSION OF ARGON FROM THE GLASS 6711 1 75.23 2 biotite conventional K-Ar 649B "4.72E-04, 0.585E-04, 1.19E-04*" 3.8 4.203 86 minimum age of volcanism K2O=3.85% AND 3.75% 6711 2 73.98 7 plagioclase conventional K-Ar 649P "4.72E-04, 0.585E-04, 1.19E-04*" 0.81 0.8807 64 minimum age of volcanism K2O=0.81% AND 0.81% 6711 3 32.86 2 glass conventional K-Ar 649G "4.72E-04, 0.585E-04, 1.19E-04*" 1.31 0.6255 51 K2O=1.31% AND 1.31% AGE TOO YOUNG DUE TO DIFFUSION OF ARGON FROM THE GLASS 6712 1 84.6 2 biotite conventional K-Ar D1303B "4.72E-04, 0.585E-04, 1.19E-04*" 6.42 8.006 90 age of volcanism K2O=6.47% AND 6.37% "AGE ALSO MENTIONED BY SKIPP AND MCGREW, 1977" 6712 2 72.28 7 plagioclase conventional K-Ar D1304P "4.72E-04, 0.585E-04, 1.19E-04*" 0.615 0.653 91 minimum age of volcanism K2O=0.62% AND 0.61% "AGE ALSO MENTIONED BY SKIPP AND MCGREW, 1977" 6713 1 51.89 whole rock conventional K-Ar LT73 no decay constants given* 5.61 4.252 80 CLAY-SIZED FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS MINOR KAOLIN AND MINOR CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6714 1 55.27 whole rock conventional K-Ar MB11 no decay constants given* 2.86 2.311 59 CLAY-SIZED FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6715 1 52.07 whole rock conventional K-Ar LT51 no decay constants given* 5.3 4.031 79 0.2 TO 0.5 MICROMETER-SIZED MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AND TRACE CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6715 2 53.34 whole rock conventional K-Ar LT51 no decay constants given* 5.26 4.1 0.06 TO 0.2 MICROMETER-SIZED MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AND TRACE CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6715 3 55.63 whole rock conventional K-Ar LT51 no decay constants given* 5.08 4.132 LESS THAN 0.06 MICROMETER-SIZED MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AND TRACE CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6716 1 54.05 whole rock conventional K-Ar LT96A no decay constants given* 4.9 3.871 82 0.2 TO 0.5 MICROMETER-SIZE MIXED LAYERED ILLITE/SMECTITE PLUS TRACE CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6716 2 54.16 whole rock conventional K-Ar LT96A no decay constants given* 4.83 3.823 LESS THAN 0.2 MICROMETER-SIZE MIXED LAYERED ILLITE/SMECTITE PLUS TRACE CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6717 1 51.35 whole rock conventional K-Ar LT14 no decay constants given* 5.31 3.982 70 CLAY-SIZED FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS TRACE CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6718 1 56.91 whole rock conventional K-Ar LT93A no decay constants given* 5.35 4.453 85 CLAY-SIZED FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AND CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6719 1 53.58 whole rock conventional K-Ar LT4 no decay constants given* 4.85 3.797 56 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AND CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6720 1 59.16 whole rock conventional K-Ar LT162 no decay constants given* 5.09 4.407 87 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6721 1 50.94 whole rock conventional K-Ar LT128 no decay constants given* 4.56 3.392 66 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS CHLORITE AND TRACE KAOLIN AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6722 1 58.74 whole rock conventional K-Ar LT85 no decay constants given* 5.48 4.711 80 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6723 1 60.15 whole rock conventional K-Ar LTE27 no decay constants given* 4.39 3.866 73 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS KAOLIN AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6724 1 57.69 whole rock conventional K-Ar LT178 no decay constants given* 4.96 4.186 70 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS MINOR KAOLIN AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6725 1 56.4 whole rock conventional K-Ar LT24 no decay constants given* 5.95 4.908 84 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS CHLORITE AND TRACE KAOLIN AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6726 1 56.02 whole rock conventional K-Ar LTE21 no decay constants given* 6.01 4.923 88 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS TRACE OF CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6727 1 67.58 whole rock conventional K-Ar LTE23 no decay constants given* 4.98 4.937 90 0.2 TO 0.5 MICROMETER-SIZE MIXED LAYERED ILLITE/SMECTITE PLUS CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6727 2 65.95 whole rock conventional K-Ar LTE23 no decay constants given* 5.14 4.971 0.06 TO 0.2 MICROMETER-SIZE MIXED LAYERED ILLITE/SMECTITE PLUS CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6728 1 61.81 whole rock conventional K-Ar LT109 no decay constants given* 5.5 4.979 88 CLAY-SIZE FRACTION OF MIXED LAYERED ILLITE/SMECTITE PLUS TRACE OF CHLORITE AGE IS RELATED TO TIME OF THRUST-FAULTING AND CHEMICAL-MINERALOGICAL CHANGES IN THE BENTONITE 6729 1 80.8 1 hornblende conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.183 1.407 80 age of volcanism POTASSIUM DETERMINED BY ISOTOPE DILUTION METHOD; ANALYTICAL DATA RELEASED BY BETTY SKIPP 6730 1 76.6 1 hornblende conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 0.797 0.898 76 age of volcanism POTASSIUM DETERMINED BY ISOTOPE DILUTION METHOD; ANALYTICAL DATA RELEASED BY BETTY SKIPP 6731 1 739.23 30 hornblende conventional K-Ar L-519 "4.72E-04, 0.585E-04, 1.19E-04*" 1.265 16.64 86 age of intrusion K2O=1.26% AND 1.27% 6732 1 206.84 7 plagioclase conventional K-Ar L-520 "4.72E-04, 0.585E-04, 1.19E-04*" 3.315 10.46 94 SERICITIZED PLAGIOCLASE K2O=3.33% AND 3.30% A MINIMUM AGE FOR THE SILL; SILL MAY BE ABOUT 1075 M.Y. OLD 6733 1 299.11 10 plagioclase conventional K-Ar L-521 "4.72E-04, 0.585E-04, 1.19E-04*" 4.255 19.93 94 SERICITIZED PLAGIOCLASE K2O=4.25% AND 4.26% A MINIMUM AGE FOR THE SILL; SILL MAY BE ABOUT 1075 M.Y. OLD 6734 1 288.37 10 plagioclase conventional K-Ar L-522 "4.72E-04, 0.585E-04, 1.19E-04*" 3.905 17.58 95 SERICITIZED PLAGIOCLASE K2O=3.89% AND 3.92% A MINIMUM AGE FOR THE SILL; SILL MAY BE ABOUT 1075 M.Y. OLD 6735 1 5.44 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 6736 1 7 0.8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.757 0.0768 age of volcanism "ANALYTICAL DATA FROM R.B. BERG, MONTANA BUREAU OF MINES AND GEOLOGY --COMPILER" 6737 1 49 1.7 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 6738 1 49.5 1.5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 6739 1 53.5 2.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 6743 1 55.3 0.7 biotite conventional K-Ar K-143A "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "AGE ALSO REPORTED IN USGS PROFESSIONAL PAPER 900 (1974), P. 32, AND BY ELLIOTT (1974)" 6744 1 73.6 0.9 adularia conventional K-Ar E459 "4.72E-04, 0.585E-04, 1.19E-04" "TIME OF HYDROTHERMAL ACTIVITY; AGE ALSO REPORTED IN USGS PROFESSIONAL PAPER 900 (1974), P. 32" 6789 1 69 sanidine conventional K-Ar AK 338 "4.76E-04, 0.589E-04, 1.18E-04" 9.43 72 minimum age of volcanism 40AR/40K=0.00413 6789 2 72 biotite conventional K-Ar AK 337 "4.76E-04, 0.589E-04, 1.18E-04" 8.3 72 age of volcanism 40AR/40K=0.00430 6790 1 68 biotite conventional K-Ar AK 308 "4.76E-04, 0.589E-04, 1.18E-04" 7.95 77 age of volcanism 40AR/40K=0.00411 6791 1 61 biotite conventional K-Ar 317 "4.76E-04, 0.589E-04, 1.18E-04" 5.18 39 minimum age of volcanism 40AR/40K=0.00363 6791 2 65 biotite conventional K-Ar 317 "4.76E-04, 0.589E-04, 1.18E-04" 5.14 63 age of volcanism 40AR/40K=0.00391 6791 3 64 sanidine conventional K-Ar 318 "4.76E-04, 0.589E-04, 1.18E-04" 10.42 78 age of volcanism 40AR/40K=0.00386 6791 4 64 sanidine conventional K-Ar 318 "4.76E-04, 0.589E-04, 1.18E-04" 10.61 94 age of volcanism 40AR/40K=0.00386 6792 1 2.05 0.07 sanidine conventional K-Ar 598. (URRL-1) "4.962E-04, 0.581E-04, 1.1167E-04" 9.02 2.663 73 age of volcanism "K=7.49% ANALYST: S.H. EVANS, DEPT. OF GEOLOGY, UNIV. OF UTAH" 6793 1 1.95 0.35 whole rock conventional K-Ar 600. (URRL-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.43 0.122 7 age of volcanism "K=0.36% ANALYST: S.H. EVANS, DEPT. OF GEOLOGY, UNIV. OF UTAH" YOUNGEST BASALT REPORTED IN THIS AREA 6794 1 2.09 0.07 sanidine conventional K-Ar 597. (URRL-3) "4.962E-04, 0.581E-04, 1.1167E-04" 8.97 2.711 65 age of volcanism "K=7.45% ANALYST: S.H. EVANS, DEPT. OF GEOLOGY, UNIV. OF UTAH" 6795 1 30.8 1.2 whole rock conventional K-Ar 583. (LRRL-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.84 8.222 46 age of volcanism "K=1.53% ANALYST: S.H. EVANS, DEPT. OF GEOLOGY, UNIV. OF UTAH" VERTEBRATE REMAINS SUGGEST LOWER MIOCENE AGE 6796 1 38.6 1.5 whole rock conventional K-Ar 573. (JOS) "4.72E-04, 0.585E-04, 1.19E-04*" 4.144 2.328 74 age of volcanism -60+200 MESH RANGE "K=3.440%, RAD. 40AR=0.009303 PPM" 6797 1 49.62 1.8 biotite conventional K-Ar 534. (SB-1) "4.72E-04, 0.585E-04, 1.19E-04*" 7.482 5.419 69 -60+200 MESH RANGE "K=6.211%, RAD. 40AR=0.02166 PPM" THIS AGE IS APPARENTLY TOO YOUNG 6798 1 64.64 2.4 biotite conventional K-Ar 430. (K-2) "4.72E-04, 0.585E-04, 1.19E-04*" 7.658 7.256 61 minimum age of intrusion -60+200 MESH "K=6.357%, RAD. 40AR=0.02900 PPM" 6798 2 71.77 3.2 hornblende conventional K-Ar 430. (K-2) "4.72E-04, 0.585E-04, 1.19E-04*" 1.461 1.54 52 age of intrusion -80+200 MESH "K=1.213%, RAD. 40AR=0.006154 PPM" 6799 1 91.3 2.7 biotite conventional K-Ar 401. (EL-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 10.97 74 age of intrusion K=6.76% 6800 1 81.7 2.8 biotite conventional K-Ar 386. (RR-1) "4.72E-04, 0.585E-04, 1.19E-04*" 9.312 11.21 72 age of intrusion K=7.730% 6801 1 85.18 3.4 whole rock conventional K-Ar 351. (K-1) "4.72E-04, 0.585E-04, 1.19E-04*" 2.624 3.295 66 age not evaluated -60+200 MESH "K=2.178%, RAD. 40AR=0.01317 PPM" 6802 1 88.52 4 hornblende conventional K-Ar 345. (SG-1) "4.72E-04, 0.585E-04, 1.19E-04*" 1.13 1.476 49 age not evaluated -60+200 MESH "K=0.938%, RAD. 40AR=0.005898 PPM" 6823 1 286.83 10 muscovite conventional K-Ar 1M "4.72E-04, 0.584E-04, 1.19E-04*" 6.01 26.9 72 -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6823 2 315.44 3 biotite conventional K-Ar 1B "4.72E-04, 0.584E-04, 1.19E-04*" 8.54 42.38 96 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6824 1 280.89 3 muscovite conventional K-Ar 2M "4.72E-04, 0.584E-04, 1.19E-04*" 8.33 36.45 98 -40 +80 MESH GRAIN SIZE A COOLING AGE 6824 2 324.36 6 biotite conventional K-Ar 2B "4.72E-04, 0.584E-04, 1.19E-04*" 7.94 40.62 98 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6825 1 286.86 5 muscovite conventional K-Ar 3M "4.72E-04, 0.584E-04, 1.19E-04*" 6.36 28.47 93 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6826 1 325.73 2 muscovite conventional K-Ar 4M "4.72E-04, 0.584E-04, 1.19E-04*" 6.95 35.72 76 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6827 1 387.82 5 biotite conventional K-Ar 5B "4.72E-04, 0.584E-04, 1.19E-04*" 7.25 45.16 98 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6828 1 368.21 4 muscovite conventional K-Ar 6M "4.72E-04, 0.584E-04, 1.19E-04*" 7.64 44.93 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6828 2 369.56 4 biotite conventional K-Ar 6B "4.72E-04, 0.584E-04, 1.19E-04*" 5.88 34.72 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6829 1 353.33 6 muscovite conventional K-Ar 7M "4.72E-04, 0.584E-04, 1.19E-04*" 7.01 39.39 50 -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6829 2 419.88 7 biotite conventional K-Ar 7B "4.72E-04, 0.584E-04, 1.19E-04*" 5.89 40.09 96 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6830 1 401.72 4 biotite conventional K-Ar 11B "4.72E-04, 0.584E-04, 1.19E-04*" 7.97 51.63 98 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6831 1 343.7 7 muscovite conventional K-Ar 12M "4.72E-04, 0.584E-04, 1.19E-04*" 6.63 36.14 95 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6831 2 354.63 2 biotite conventional K-Ar 12B "4.72E-04, 0.584E-04, 1.19E-04*" 4.86 27.42 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6832 1 359.84 4 muscovite conventional K-Ar 13M "4.72E-04, 0.584E-04, 1.19E-04*" 7.69 44.09 95 -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6832 2 384.54 5 biotite conventional K-Ar 13B "4.72E-04, 0.584E-04, 1.19E-04*" 8.33 51.4 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6833 1 353.38 5 muscovite conventional K-Ar 14M "4.72E-04, 0.584E-04, 1.19E-04*" 9.29 52.21 98 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6834 1 398.12 5 biotite conventional K-Ar 15B "4.72E-04, 0.584E-04, 1.19E-04*" 5.37 34.44 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6835 1 372.26 5 biotite conventional K-Ar 16B "4.72E-04, 0.584E-04, 1.19E-04*" 4 23.81 41 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE; NOT A PURE BIOTITE SEPARATE PROBABLY A COOLING AGE 6836 1 346.89 4 muscovite conventional K-Ar 17M "4.72E-04, 0.584E-04, 1.19E-04*" 8.37 46.09 98 -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6836 2 388.01 4 biotite conventional K-Ar 17B "4.72E-04, 0.584E-04, 1.19E-04*" 6.41 39.95 94 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6837 1 406.75 6 whole rock conventional K-Ar 18WR "4.72E-04, 0.584E-04, 1.19E-04*" 4.01 26.34 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6838 1 353.68 3 muscovite conventional K-Ar 19M "4.72E-04, 0.584E-04, 1.19E-04*" 3.31 18.62 90 -40 +80 MESH GRAIN SIZE (IMPURE MUSCOVITE SEPARATE) PROBABLY A COOLING AGE 6838 2 370.94 5 biotite conventional K-Ar 19B "4.72E-04, 0.584E-04, 1.19E-04*" 5.64 33.44 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6839 1 399.93 13 biotite conventional K-Ar 20B "4.72E-04, 0.584E-04, 1.19E-04*" 7.11 45.83 98 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6840 1 328.39 3 muscovite conventional K-Ar 29M "4.72E-04, 0.584E-04, 1.19E-04*" 7.01 36.35 93 -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6840 2 351.64 4 biotite conventional K-Ar 29B "4.72E-04, 0.584E-04, 1.19E-04*" 7.75 43.32 96 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6841 1 340.78 5 biotite conventional K-Ar 30B "4.72E-04, 0.584E-04, 1.19E-04*" 7.97 43.04 97 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE PROBABLY A COOLING AGE 6842 1 268.58 2 sericite conventional K-Ar 31M "4.72E-04, 0.584E-04, 1.19E-04*" 3.6 15.01 94 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE (IMPURE MUSCOVITE SEPARATE?) PROBABLY A COOLING AGE 6843 1 431.4 3 hornblende conventional K-Ar 43H "4.72E-04, 0.584E-04, 1.19E-04*" 1.16 8.139 94 -40 +80 MESH GRAIN SIZE APPROXIMATE (MINIMUM) AGE OF METAMORPHISM 6844 1 375.48 4 hornblende conventional K-Ar 44H "4.72E-04, 0.584E-04, 1.19E-04*" 0.63 3.786 94 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE 6845 1 517.83 8 hornblende conventional K-Ar 45H "4.72E-04, 0.584E-04, 1.19E-04*" 0.17 1.468 84 -40 +80 MESH GRAIN SIZE "AGE IS ANOMOLOUSLY OLD, POSSIBLY DUE TO AN ERROR IN DETERMINING THE LOW POTASSIUM CONCENTRATION OF THE SAMPLE" 6845 2 481 18 hornblende 40Ar/36Ar-40K/36Ar isochron 45H "4.72E-04, 0.584E-04, 1.19E-04" 286 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6845 3 480 15 hornblende 40Ar-40K isochron 45H "4.72E-04, 0.584E-04, 1.19E-04" 287 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6846 1 400.73 4 hornblende conventional K-Ar 46H "4.72E-04, 0.584E-04, 1.19E-04*" 0.88 5.685 94 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE 6847 1 489.26 5 hornblende conventional K-Ar 47H "4.72E-04, 0.584E-04, 1.19E-04*" 0.82 6.635 95 age of metamorphic crystallization -40 +80 MESH GRAIN SIZE 6847 2 481 18 hornblende 40Ar/36Ar-40K/36Ar isochron 47H "4.72E-04, 0.584E-04, 1.19E-04" 286 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6847 3 480 15 hornblende 40Ar-40K isochron 47H "4.72E-04, 0.584E-04, 1.19E-04" 287 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6848 1 465.86 10 hornblende conventional K-Ar 48H "4.72E-04, 0.584E-04, 1.19E-04*" 0.57 4.362 90 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE 6848 2 481 18 hornblende 40Ar/36Ar-40K/36Ar isochron 48H "4.72E-04, 0.584E-04, 1.19E-04" 286 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6848 3 480 15 hornblende 40Ar-40K isochron 48H "4.72E-04, 0.584E-04, 1.19E-04" 287 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6849 1 474.86 13 hornblende conventional K-Ar 49H "4.72E-04, 0.584E-04, 1.19E-04*" 0.29 2.268 84 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE 6849 2 481 18 hornblende 40Ar/36Ar-40K/36Ar isochron 49H "4.72E-04, 0.584E-04, 1.19E-04" 286 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6849 3 480 15 hornblende 40Ar-40K isochron 49H "4.72E-04, 0.584E-04, 1.19E-04" 287 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6850 1 455.45 8 hornblende conventional K-Ar 50H "4.72E-04, 0.584E-04, 1.19E-04*" 0.22 1.641 41 minimum age of metamorphic crystallization -40 +80 MESH GRAIN SIZE 6850 2 481 18 hornblende 40Ar/36Ar-40K/36Ar isochron 50H "4.72E-04, 0.584E-04, 1.19E-04" 286 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6850 3 480 15 hornblende 40Ar-40K isochron 50H "4.72E-04, 0.584E-04, 1.19E-04" 287 age of metamorphic crystallization 5-POINT HORNBLENDE ISOCHRON; SEE THESIS FOR ANALYTICAL DATA 6851 1 203.63 10 whole rock conventional K-Ar KA74-170 "4.72E-04, 0.585E-04, 1.19E-04*" 0.29 0.9 8465 age of intrusion "%K2O=0.29, 0.29, 0.29; 40AR-RAD=0.94XE-10, 0.85XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6852 1 192.74 10 whole rock conventional K-Ar KA74-171 "4.72E-04, 0.585E-04, 1.19E-04*" 0.28 0.82 4940 age of intrusion "%K2O=0.28, 0.28; 40AR-RAD=0.80XE-10, 0.85XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6853 1 223.9 20 whole rock conventional K-Ar KA74-185 "4.72E-04, 0.585E-04, 1.19E-04*" 0.081 0.278 2814 age of intrusion "%K2O=0.0817, 0.0804; 40AR-RAD=0.293XE-10, 0.262XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6854 1 224.14 12 whole rock conventional K-Ar KA74-186 "4.72E-04, 0.585E-04, 1.19E-04*" 0.25 0.859 5453 age of intrusion "%K2O=0.24, 0.25; 40AR-RAD=0.897XE-10, 0.821XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6855 1 187.28 9 whole rock conventional K-Ar KA74-187 "4.72E-04, 0.585E-04, 1.19E-04*" 0.34 0.966 1646 age of intrusion "%K2O=0.34, 0.33; 40AR-RAD=0.973XE-10, 0.959XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6856 1 228.02 9 whole rock conventional K-Ar KA74-194 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0633 0.2215 3136 age of intrusion "%K2O=0.0647, 0.0619; 40AR-RAD=0.2240XE-10, 0.2191XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6857 1 268.94 8 whole rock conventional K-Ar KA74-192 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0787 0.3286 3637 "K=0.0654%, 0.0652%; 40AR(RAD)=0.0737 AND 0.0736XE-5 CC/GM" AGE IS ANOMOLOUSLY OLD FOR DIKE CUTTING TRIASSIC ROCKS; THIS MAY BE DUE TO THE PRESENCE OF EXCESS 40AR OR ANALYTICAL PROBLEMS IN MEASURING LOW K AND AR CONCENTRATIONS (COMPILER) 6858 1 230.3 12 whole rock conventional K-Ar KA74-193 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0574 0.203 4232 age of intrusion "%K2O=0.0575, 0.0572; 40AR-RAD=0.203XE-10, 0.203XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6859 1 238.52 13 whole rock conventional K-Ar KA74-202 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0937 0.344 3134 age of intrusion "%K2O=0.0916, 0.0958; 40AR-RAD=0.322XE-10, 0.355XE-10 MOLES/GM" INITIAL 87SR/86SR IS PROBABLY 0.705 6860 1 16.23 5 zeolite conventional K-Ar KA74-204 "4.72E-04, 0.585E-04, 1.19E-04*" 0.98 0.23 1010 "%K2O=0.99, 0.96; 40AR-RAD=0.17XE-10, 0.28XE-10 MOLES/GM; HEULANDITE NOT BAKED BEFORE FUSION" MINIMUM AGE FOR MINERAL; AGE IS LOW DUE TO ARGON LOSS; ZEOLITE PROBABLY FORMED SOON AFTER EMPLACEMENT OF THE DIABASE DIKE 6861 1 2.59 0.5 zeolite conventional K-Ar KA74-205 "4.72E-04, 0.585E-04, 1.19E-04*" 0.67 0.025 1411 "%K2O=0.67, 0.67, 0.66, 0.66; 40AR-RAD=0.029XE-10, 0.021XE-10 MOLES/GM; HARMOTOME WAS NOT BAKED BEFORE FUSION" AGE IS LOW DUE TO ARGON LOSS; ZEOLITE PROBABLY FORMED SOON AFTER EMPLACEMENT OF THE DIABASE DIKE 6862 1 12.6 1.2 zeolite conventional K-Ar KA74-210 "4.72E-04, 0.585E-04, 1.19E-04*" 0.44 0.0801 66 "%K2O=0.42, 0.45; 40AR-RAD=0.0812XE-10, 0.0790XE-10 MOLES/GM; HEULANDITE WAS NOT BAKED BEFORE FUSION" AGE IS LOW DUE TO ARGON LOSS; ZEOLITE PROBABLY FORMED SOON AFTER EMPLACEMENT OF THE DIABASE DIKE 6863 1 0.21 zeolite conventional K-Ar 3-ETB "4.962E-04, 0.581E-04, 1.1167E-04*" 16.35 0.0491 4 NO AGE CALCULATED 6864 1 36.4 14 zeolite conventional K-Ar 2-ETB "4.72E-04, 0.585E-04, 1.19E-04*" 0.287 0.152 6 MATERIAL WAS NOT BAKED BEFORE FUSION A MINIMUM AGE FOR THE HARMOTOME; AGE IS LOW DUE TO ARGON LOSS; ZEOLITE PROBABLY FORMED SOON AFTER EMPLACEMENT OF THE DIABASE DIKE 6865 1 zeolite D3S-SHNPP 0.075 NO AGE CALCULATED AS NO RADIOGENIC ARGON DETECTED 6866 1 1.24 1 zeolite conventional K-Ar D2-5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.671 0.012 3 LAUMONTITE WAS NOT BAKED BEFORE FUSION AGE IS LOW DUE TO ARGON LOSS; ZEOLITE PROBABLY FORMED SOON AFTER EMPLACEMENT OF THE DIABASE DIKE 6866 2 5.02 2 zeolite conventional K-Ar D2-5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.671 0.0486 6 LAUMONTITE WAS NOT BAKED BEFORE FUSION AGE IS LOW DUE TO ARGON LOSS 6867 1 2.34 0.4 zeolite conventional K-Ar 2-LIS "4.72E-04, 0.585E-04, 1.19E-04*" 2.4 0.0808 8 THE SAMPLE IS A MIXTURE OF LAUMONTITE AND F-SAPONITE MATERIAL WAS NOT BAKED BEFORE FUSION AGE IS LOW DUE TO ARGON LOSS; ZEOLITE PROBABLY FORMED SOON AFTER EMPLACEMENT OF THE DIABASE DIKE 6913 1 1138.89 55 glauconite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 4.9 112 99 "THIS AGE ALSO REPORTED BY MUDGE (1972, P. A8, SAMPLE 483G, FIELD NO. HS487). K-AR AND RB-SR AGES INDICATE THAT THE AGE IS AROUND 1100 M.Y." 6914 1 1075.76 55 glauconite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 7.98 169 99 "THIS AGE ALSO REPORTED BY MUDGE (1972, P. A8, SAMPLE 484G, FIELD NO. HS742). K-AR AND RB-SR AGES INDICATE THAT THE AGE IS AROUND 1100 M.Y." 6915 1 1086.54 55 glauconite conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 6.71 144 99 "THIS AGE ALSO REPORTED BY MUDGE (1972, P. A8, SAMPLE 516G, FIELD NO. HS730). K-AR AND RB-SR AGES INDICATE THAT THE AGE IS AROUND 1100 M.Y." 6916 1 1065.8 55 glauconite conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 7.84 164 99 "THIS AGE ALSO REPORTED BY MUDGE (1972, P. A8, SAMPLE 517G, FIELD NO. HS739). K-AR AND RB-SR AGES INDICATE THAT THE AGE IS AROUND 1100 M.Y." 6917 1 1127.34 55 glauconite conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.25 186 100 "A K-AR AGE OF 1110 +/- 55 M.Y. WAS REPORTED FOR THIS SAMPLE BY MUDGE (1972, P. A8, SAMPLE 379G, FIELD NO. HS411D). K-AR AND RB-SR AGES INDICATE THAT THE AGE IS AROUND 1100 M.Y." 6919 1 1062.72 50 glauconite conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 174 99 K-AR AND RB-SR AGES INDICATE THAT THE TIME OF SEDIMENTATION WAS AROUND 1100 M.Y. AGO 6920 1 1112.31 55 glauconite conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 5.6 124 95 K-AR AND RB-SR AGES INDICATE THAT THIS IS THE PROBABLE TIME OF SEDIMENTATION 6923 1 1048.52 50 glauconite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 8.06 165 93 "THIS AGE ALSO REPORTED BY MUDGE (1972, P. A8, SAMPLE 482G, FIELD NO. HS481). K-AR AND RB-SR AGES INDICATE THAT THE AGE IS AROUND 1100 M.Y." 6924 1 772.16 50 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 5.91 82 97 minimum age of intrusion 6925 1 1335.95 45 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 7.3 208 100 age of metamorphic crystallization 6964 1 20 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 6965 1 73.7 2.4 muscovite conventional K-Ar BP-1 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN "AGE ALSO REPORTED BY HUGHES (1975, NORTHWEST GEOLOGY)" 6966 1 70.1 2.5 biotite conventional K-Ar HM-57 no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN "AGE ALSO REPORTED BY HUGHES (1975, NORTHWEST GEOLOGY)" 6967 1 70.6 2.3 biotite conventional K-Ar WC-7 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN "AGE ALSO REPORTED BY HUGHES (1975, NORTHWESGNEOUS ROCKS IN THE HENDERSON-WILLOW CREEK IGNEOUS BELT, GRANITE COUNTY, MONTANA: PH.D. DISSERTATION, MICHIGAN TECH. UNIVERSITY, HOUGHTON, MICHIGAN, P. 236." 6968 1 48.7 1.7 biotite conventional K-Ar TV-1 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN "AGE ALSO REPORTED BY HUGHES (1975, NORTHWEST GEOLOGY)" 6969 1 1110 amphiboles conventional K-Ar LP-4 "4.76E-04, 0.589E-04, 1.18E-04" 0.48 age of intrusion BROWN AMPHIBOLE 6970 1 1400 amphiboles conventional K-Ar PM-1 "4.76E-04, 0.589E-04, 1.18E-04" 0.3 GREEN AMPHIBOLE OTHER AGE DETERMINATIONS INDICATE THAT THIS AGE IS PROBABLY TOO OLD 6986 1 3123.74 200 whole rock conventional K-Ar 53NB-11 "4.72E-04, 0.584E-04, 1.19E-04*" 0.16 19.32 97 K=0.13% THIS AGE IS APPARENTLY TOO OLD FOR TIME OF EMPLACEMENT 6986 2 2402.37 plagioclase conventional K-Ar 53NB-11 "4.72E-04, 0.584E-04, 1.19E-04*" 0.28 20.27 87 K=0.23% TIME OF INTRUSION WAS PROBABLY 2750 M.Y. AGO 6986 3 2486.83 plagioclase conventional K-Ar 53NB-11 "4.72E-04, 0.584E-04, 1.19E-04*" 0.28 21.59 97 K=0.23% TIME OF INTRUSION WAS AROUND 2750 M.Y. AGO 6987 1 6882.45 enstatite conventional K-Ar 61SC "4.72E-04, 0.584E-04, 1.19E-04*" 0.0024 2.766 87 ENSTATITE POTASSIUM DETERMINED BY ISOTOPE DILUTION; K=0.0020% AGE SPURIOUS; EXCESS ARGON PRESENT 6987 2 6018.99 augite-ferroaugite conventional K-Ar 61SC "4.72E-04, 0.584E-04, 1.19E-04*" 0.0054 3.803 80 POTASSIUM DETERMINED BY ISOTOPE DILUTION; K=0.0045% AGE SPURIOUS; EXCESS ARGON PRESENT 6987 3 1976.63 plagioclase conventional K-Ar 61SC "4.72E-04, 0.584E-04, 1.19E-04*" 0.0598 3.09 71 POTASSIUM DETERMINED BY ISOTOPE DILUTION; K=0.0496% AGE IS TOO YOUNG FOR AGE OF EMPLACEMENT 6987 4 2003.63 plagioclase conventional K-Ar 61SC "4.72E-04, 0.584E-04, 1.19E-04*" 0.0598 3.16 81 POTASSIUM DETERMINED BY ISOTOPE DILUTION; K=0.0496% AGE IS TOO YOUNG FOR AGE OF EMPLACEMENT 6988 1 2221.31 plagioclase 55MV-29 "4.72E-04, 0.584E-04, 1.19E-04*" 0.205 12.915 54 K=0.17% AGE IS TOO YOUNG FOR AGE OF EMPLACEMENT 6989 1 2254.29 200 whole rock conventional K-Ar 55BE-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.0795 5.139 85 K=0.066% AGE IS TOO YOUNG FOR AGE OF EMPLACEMENT 6990 1 2641.6 phlogopite conventional K-Ar 61MV-4A "4.72E-04, 0.584E-04, 1.19E-04*" 8.75 755.48 99 minimum age of intrusion -14 +35 MESH RANGE K=7.26% 6990 2 2609.49 phlogopite conventional K-Ar 61MV-4B "4.72E-04, 0.584E-04, 1.19E-04*" 9.035 762.19 99 minimum age of intrusion -35 +60 MESH RANGE K=7.50% 6990 3 2546.23 phlogopite conventional K-Ar 61MV-4C "4.72E-04, 0.584E-04, 1.19E-04*" 8.89 716.16 99 -60 +170 MESH RANGE K=7.38% AGE TOO YOUNG; SOME LOSS OF RADIOGENIC ARGON 6991 1 2620.63 phlogopite conventional K-Ar 54ER-136 "4.72E-04, 0.584E-04, 1.19E-04*" 6.96 591.9 98 minimum age of intrusion K=5.78% 6992 1 2654.56 phlogopite conventional K-Ar 61MV-3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.42 733.81 99 minimum age of intrusion K=6.99% 6993 1 2547.05 biotite conventional K-Ar 53-424-1 "4.72E-04, 0.584E-04, 1.19E-04*" 9.32 751.25 99 minimum age of intrusion K=7.74% 7027 1 1750 biotite conventional K-Ar 16(AK176) "4.76E-04, 0.589E-04, 1.18E-04" 8.99 age of metamorphic crystallization 40AR/40K=0.171 7027 2 1790 hornblende conventional K-Ar 17(AK265) "4.76E-04, 0.589E-04, 1.18E-04" 0.77 age of metamorphic crystallization 40AR/40K=0.177 7028 1 1710 hornblende conventional K-Ar 18(AK167) "4.76E-04, 0.589E-04, 1.18E-04" 1.11 age of metamorphic crystallization 40AR/40K=0.165 7029 1 1750 biotite conventional K-Ar 19(AK177) "4.76E-04, 0.589E-04, 1.18E-04" 8.13 age of metamorphic crystallization 40AR/40K=0.170 7030 1 2440 biotite conventional K-Ar 53(AK253) "4.76E-04, 0.589E-04, 1.18E-04" 9.33 age of metamorphic crystallization 40AR/40K=0.295 7031 1 2450 biotite conventional K-Ar 54(AK254) "4.76E-04, 0.589E-04, 1.18E-04" 8.99 age of metamorphic crystallization 40AR/40K=0.307 7032 1 2200 hypersthene conventional K-Ar 55(AK266) "4.76E-04, 0.589E-04, 1.18E-04" 0.59 age of metamorphic crystallization 40AR/40K=0.246 7033 1 1720 biotite conventional K-Ar 56(AK36) "4.76E-04, 0.589E-04, 1.18E-04" 7.9 age of metamorphic crystallization 40AR/40K=0.166 7034 1 753.21 illite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04*" 10.38 139.7 age meaning uncertain (analysis questionable) 7035 1 2700 Unk conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 7036 1 2660 biotite conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 7037 1 3065 biotite conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN AGE APPEARS TOO OLD. NUNES AND TILTON(1971) STATE THAT ADDITIONAL AGES OF 1880 M.Y. AND 2330 M.Y. WERE OBTAINED FROM DIFFERENT BIOTITE FRACTIONS FROM THE SAME HORNFELS SAMPLE. THE HORNFELS IS PROBABLY AROUND 2750 M.Y. OLD. 7038 1 2700 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN. BIOTITE AGES RANGE FROM 2470-2700 M.Y. 7039 1 2700 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN. BIOTITE AGES RANGE FROM 2470-2700 M.Y. 7040 1 1930 plagioclase conventional K-Ar (NOT GIVEN) no decay constants given initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 7041 1 2330 biotite conventional K-Ar (NOT GIVEN) no decay constants given initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 7042 1 1760 hornblende conventional K-Ar (NOT GIVEN) no decay constants given minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 7049 1 1191.29 35 K feldspar conventional K-Ar F1024 "4.72E-04, 0.585E-04, 1.19E-04*" 4.12 100.1 98 K-FELDSPAR PLUS QUARTZ A SPURIOUS AGE (TOO YOUNG) 7049 2 1660.39 40 biotite conventional K-Ar B1024 "4.72E-04, 0.585E-04, 1.19E-04*" 8.12 318.5 100 initial age disturbed by later metamorphism 7049 3 1822.67 50 muscovite conventional K-Ar M1024 "4.72E-04, 0.585E-04, 1.19E-04*" 10.26 465.4 99 age of later metamorphism 7082 1 0.31 0.01 glass 76GQ21 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN AN AGE OF 0.304 +/- 0.022 M.Y. REPORTED IN USGS OPEN FILE REPORT 79-1657 FOR BIG SOUTHERN BUTTE; THIS AGE IS AVERAGE OF K-AR AGES 0.296 AND 0.312 M.Y. 7083 1 0.3 0.01 whole rock 76G022 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN AN AGE OF 0.304 +/- 0.022 M.Y. REPORTED IN USGS OPEN FILE REPORT 79-1657 FOR BIG SOUTHERN BUTTE; THIS AGE IS AVERAGE OF K-AR AGES 0.296 AND 0.312 M.Y. 7084 1 1.42 0.02 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED IN USGS OPEN-FILE REPORTS 78-691 (P. 47) AND 79-669 7085 1 whole rock conventional K-Ar MAK77-S47 no decay constants given 0.553 0 minimum age of volcanism AGE IS LESS THAN 0.490 M.Y. THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS LESS-THAN-0.450 M.Y. 7085 2 whole rock conventional K-Ar MAK77-S47 no decay constants given 0.553 0 age of volcanism AGE IS LESS THAN 0.450 M.Y. THE WEIGHTED-MEAN AGE FOR 2 SAMPLES IS LESS-THAN-0.450 M.Y. 7086 1 whole rock conventional K-Ar MAK77-S66 no decay constants given 0.544 0 age of volcanism AGE IS LESS-THAN-0.570 M.Y. THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS LESS-THAN-0.490 M.Y. 7086 2 whole rock conventional K-Ar MAK77-S66 no decay constants given 0.544 0 age of volcanism AGE IS LESS-THAN-0.490 M.Y. THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS LESS-THAN-0.490 M.Y. 7087 1 whole rock conventional K-Ar MAK77-S119 no decay constants given 0.54 0 age of volcanism AGE IS LESS-THAN-0.490 M.Y. THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS LESS-THAN-0.490 M.Y. 7087 2 whole rock conventional K-Ar MAK77-S119 no decay constants given 0.54 0 age of volcanism AGE IS LESS-THAN-0.620 M.Y. THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS LESS-THAN-0.490 M.Y. 7088 1 0.65 0.13 whole rock conventional K-Ar MAK77-S50 "4.962E-04, 0.581E-04, 1.1167E-04" 0.604 0.0056 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.530 +/- 0.090 M.Y. AN INCORRECT AGE OF 0.135 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. II) IN USGS OPEN-FILE REPORT 78-665. 7088 2 0.43 0.12 whole rock conventional K-Ar MAK77-S50 "4.962E-04, 0.581E-04, 1.1167E-04" 0.604 0.0037 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.530 +/- 0.090 M.Y. AN INCORRECT AGE OF 0.135 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. II) IN USGS OPEN-FILE REPORT 78-665. 7089 1 0.36 0.1 whole rock conventional K-Ar MAK77-S86 "4.962E-04, 0.581E-04, 1.1167E-04" 0.616 0.0032 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.320 +/- 0.065 M.Y. AN INCORRECT AGE OF 0.135 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. II) IN USGS OPEN-FILE REPORT 78-665. 7089 2 0.28 0.09 whole rock conventional K-Ar MAK77-S86 "4.962E-04, 0.581E-04, 1.1167E-04" 0.616 0.0025 1 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.320 +/- 0.065 M.Y. AN INCORRECT AGE OF 0.135 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. II) IN USGS OPEN-FILE REPORT 78-665. 7090 1 0.52 0.09 whole rock conventional K-Ar MAK77-S122 "4.962E-04, 0.581E-04, 1.1167E-04" 0.602 0.0045 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.405 +/- 0.060 M.Y. AN INCORRECT AGE OF 0.135 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. II) IN USGS OPEN-FILE REPORT 78-665. 7090 2 0.29 0.09 whole rock conventional K-Ar MAK77-S122 "4.962E-04, 0.581E-04, 1.1167E-04" 0.602 0.0026 1 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.405 +/- 0.060 M.Y. AN INCORRECT AGE OF 0.135 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. II) IN USGS OPEN-FILE REPORT 78-665. 7091 1 0.5 0.13 whole rock conventional K-Ar MAK77-S54 "4.962E-04, 0.581E-04, 1.1167E-04" 0.588 0.0042 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.460 +/- 0.085 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7091 2 0.43 0.11 whole rock conventional K-Ar MAK77-S54 "4.962E-04, 0.581E-04, 1.1167E-04" 0.588 0.0036 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.460 +/- 0.085 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7092 1 0.45 0.13 whole rock conventional K-Ar MKA77-S72 "4.962E-04, 0.581E-04, 1.1167E-04" 0.558 0.0037 1 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.395 +/- 0.085 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7092 2 0.36 0.1 whole rock conventional K-Ar MAK77-S72 "4.962E-04, 0.581E-04, 1.1167E-04" 0.558 0.003 1 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.395 +/- 0.085 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7093 1 0.26 0.06 whole rock conventional K-Ar MAK77-S107 "4.962E-04, 0.581E-04, 1.1167E-04" 0.586 0.0022 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.270 +/- 0.040 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7093 2 0.28 0.06 whole rock conventional K-Ar MAK77-S107 "4.962E-04, 0.581E-04, 1.1167E-04" 0.586 0.0024 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.270 +/- 0.040 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7094 1 0.53 0.1 whole rock conventional K-Ar MAK77-S108 "4.962E-04, 0.581E-04, 1.1167E-04" 0.585 0.0043 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.390 +/- 0.060 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7094 2 0.36 0.05 whole rock conventional K-Ar MAK77-S108 "4.962E-04, 0.581E-04, 1.1167E-04" 0.585 0.003 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.390 +/- 0.060 M.Y. AN INCORRECT AGE OF 0.143 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. III) IN USGS OPEN-FILE REPORT 78-665. 7095 1 0.51 0.15 whole rock conventional K-Ar MAK77-S111 "4.962E-04, 0.581E-04, 1.1167E-04" 0.742 0.0054 1 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.440 +/- 0.085 M.Y. AN INCORRECT AGE OF 0.210 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. IV) IN USGS OPEN-FILE REPORT 78-665. 7095 2 0.42 0.07 whole rock conventional K-Ar MAK77-S111 "4.962E-04, 0.581E-04, 1.1167E-04" 0.742 0.0046 2 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.440 +/- 0.085 M.Y. AN INCORRECT AGE OF 0.210 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. IV) IN USGS OPEN-FILE REPORT 78-665. 7096 1 0.32 0.04 whole rock conventional K-Ar MAK77-S129 "4.962E-04, 0.581E-04, 1.1167E-04" 0.809 0.0037 3 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.310 +/- 0.030 M.Y. AN INCORRECT AGE OF 0.210 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. IV) IN USGS OPEN-FILE REPORT 78-665. 7096 2 0.3 0.04 whole rock conventional K-Ar MAK77-S129 "4.962E-04, 0.581E-04, 1.1167E-04" 0.809 0.0035 3 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.310 +/- 0.030 M.Y. AN INCORRECT AGE OF 0.210 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. IV) IN USGS OPEN-FILE REPORT 78-665. 7097 1 0.45 0.05 whole rock conventional K-Ar MAK77-S114 "4.962E-04, 0.581E-04, 1.1167E-04" 0.944 0.0061 3 AN INCORRECT AGE OF 0.352 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. V-A) IN USGS OPEN-FILE REPORT 78-665. 7098 1 0.59 0.08 whole rock conventional K-Ar MAK77-S78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.942 0.008 3 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.595 +/- 0.060 M.Y. AN INCORRECT AGE OF 0.352 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. V-A) IN USGS OPEN-FILE REPORT 78-665. 7098 2 0.6 0.09 whole rock conventional K-Ar MAK77-S78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.942 0.0082 3 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.595 +/- 0.060 M.Y. AN INCORRECT AGE OF 0.352 M.Y. WAS REPORTED FOR THIS BASALT FLOW (NO. V-A) IN USGS OPEN-FILE REPORT 78-665. 7099 1 0.45 0.05 whole rock conventional K-Ar MAK77-S63 "4.962E-04, 0.581E-04, 1.1167E-04" 0.998 0.0065 3 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.460 +/- 0.040 M.Y. AN INCORRECT AGE OF 0.331 M.Y. WAS REPORTED FOR THIS BASALT FLOW IN USGS OPEN-FILE REPORT 78-665. 7099 2 0.47 0.06 whole rock conventional K-Ar MAK77-S63 "4.962E-04, 0.581E-04, 1.1167E-04" 0.998 0.0067 3 age of volcanism THE WEIGHTED-MEAN AGE FOR 2 ANALYSES IS 0.460 +/- 0.040 M.Y. AN INCORRECT AGE OF 0.331 M.Y. WAS REPORTED FOR THIS BASALT FLOW IN USGS OPEN-FILE REPORT 78-665. 7156 1 0.36 0.06 whole rock conventional K-Ar 1. USGS(M)-66AHR-136B "4.962E-04, 0.581E-04, 1.1167E-04" 0.7935 0.0042 16 age of volcanism "K2O=0.777, 0.798, 0.798, AND 0.801%" 7157 1 1.46 0.13 whole rock conventional K-Ar 2. USGS(M)-66AHR-217B "4.962E-04, 0.581E-04, 1.1167E-04" 0.706 0.0149 19 age of volcanism "0.704, 0.708, 0.708, 0.703% K2O" 7158 1 0.66 0.19 whole rock conventional K-Ar 3. USGS(M)-66AHR-218A "4.962E-04, 0.581E-04, 1.1167E-04" 1.008 0.0095 4 "1.027, 1.023, 0.980, 1.000% K2O" MINIMUM AGE FOR BASALT; THE MAGNETICALLY REVERSED FEATURE SUGGESTS THAT THE ROCK IS CONSIDERABLY OLDER THAN ITS MINIMUM AGE 7159 1 0.24 0.14 whole rock conventional K-Ar 4. USGS(M)-71AHR-134A "4.962E-04, 0.581E-04, 1.1167E-04" 0.803 0.0028 5 age not evaluated "0.799, 0.806, 0.803, 0.806% K2O" 7160 1 59.9 3 biotite conventional K-Ar 5. USGS(M)-62AGZ-7 "4.962E-04, 0.581E-04, 1.1167E-04" 6.6 5.784 72 age of intrusion "THE CALCULATED AGE AGREES WITH TWO OTHER K-AR BIOTITE AGES FROM GRANODIORITE PLUTONS ON OTHER SHUMAGIN ISLANDS (KIENLE AND TURNER, 1976, GEOLOGIC REPORT 51, P. 9-11)" 7163 1 88 4 biotite conventional K-Ar 6. USGS(W)-62ARR192 "4.962E-04, 0.581E-04, 1.1167E-04" 9.1 11.88 96 initial age disturbed by later metamorphism "BROSGE AND REISER (1971, USGS OPEN-FILE MAP 479) REPORTED AN AGE OF 86 M.Y. FOR THIS SAMPLE. THE DISCORDANCY BETWEEN THE K-AR AND PB-A AGES SUGGEST THAT THE GRANITE FORMED DURING THE LATE PALEOZOIC AND THEN WAS DISTURBED BY AN OROGENIC EVENT DURING THE LATE MESOZOIC" 7164 1 90 4 biotite conventional K-Ar 9. USGS(W)-62ABE264 "4.962E-04, 0.581E-04, 1.1167E-04" 8.85 11.78 94 initial age disturbed by later metamorphism "AGE REPORTED AS 88 M.Y. BY BROSGE AND REISER (1971, USGS OPEN-FILE MAP 479) FOR THIS SAMPLE. THE DISCORDANCY BETWEEN THE K-AR AND PB-A AGES SUGGEST THAT THE GRANITE FORMED DURING THE LATE PALEOZOIC AND THEN WAS DISTURBED BY AN OROGENIC EVENT DURING THE LATE MESOZOIC" 7164 2 94 5 muscovite conventional K-Ar 9. USGS(W)-62ABE264 "4.962E-04, 0.581E-04, 1.1167E-04" 10.3 14.34 96 initial age disturbed by later metamorphism "AGE REPORTED AS 92 M.Y. BY BROSGE AND REISER (1971, USGS OPEN-FILE MAP 479) FOR THIS SAMPLE" 7165 1 93 5 biotite conventional K-Ar 10. USGS(W)-60ATB104 "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 11.33 90 age of intrusion 7166 1 59 3 biotite conventional K-Ar 11. USGS(W)-60ATB105 "4.962E-04, 0.581E-04, 1.1167E-04" 9.05 7.756 92 age of intrusion 7167 1 64.9 2.5 biotite conventional K-Ar 12. USGS(M)-62ACH-65 "4.962E-04, 0.581E-04, 1.1167E-04" 8.465 8.051 90 age of intrusion K2O=8.53 AND 8.40% "CHAPMAN, WEBER, AND TABER (1971, USGS OPEN-FILE REPORT) REPORTED AN AGE OF 63.3 M.Y. FOR THIS SAMPLE" 7173 1 60.8 3 biotite conventional K-Ar 18. USGS(M)-62AME-120 "4.962E-04, 0.581E-04, 1.1167E-04" 6.76 6.016 45 age of intrusion 7173 2 61.9 2.5 muscovite conventional K-Ar 18. USGS(M)-62AME-120 "4.962E-04, 0.581E-04, 1.1167E-04" 8.39 7.604 90 age of intrusion 7174 1 58.2 1.5 biotite conventional K-Ar 18. USGS(M)-63AME-66 "4.962E-04, 0.581E-04, 1.1167E-04" 7.66 6.519 72 age of intrusion "7.63, 7.69% K2O" 7175 1 8.5 0.2 whole rock conventional K-Ar 20. USGS(D)-MWC-55-74 "4.962E-04, 0.581E-04, 1.1167E-04" 2.115 0.2594 73 minimum age of volcanism -60+100 MESH "2.12, 2.11% K2O" 7176 1 12.9 0.6 whole rock conventional K-Ar 21. USGS(D)-MWC-56-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.875 0.1631 49 minimum age of volcanism -60+100 MESH "0.88, 0.87% K2O" 7177 1 24.2 1.2 biotite conventional K-Ar 22. USGS(W)-VAW-60-29 "4.962E-04, 0.581E-04, 1.1167E-04" 7.34 2.577 54 age of volcanism "MIOCENE/OLIGOCENE VOLCANICS (OLMSTED AND OTHERS, 1973, USGS PP 486-H, PH39, REPORTED AN AGE OF 23 M.Y. FOR THIS BIOTITE)" 7178 1 26.9 1 biotite conventional K-Ar 23. 5-15-55A(PED-4-65) "4.962E-04, 0.581E-04, 1.1167E-04" 7.73 3.02 48 age of volcanism "OLIGOCENE VOLCANICS (OLMSTED, 1973, USGS PP 486-H, PH39, REPORTED AGE OF 26.3 M.Y. FOR THIS BIOTITE, ANALYTICAL DATA FROM DAMON AND OTHERS, 1965, P. 43)" 7179 1 67.3 2 biotite conventional K-Ar 24. USGS(D)-W-65A "4.962E-04, 0.581E-04, 1.1167E-04" 7.885 7.802 90 age of intrusion K2O=7.88 AND 7.89% "KRIEGER (1974, USGS MAP GQ-1106) REPORTED AN AGE OF 66.0 M.Y. FOR THIS BIOTITE" 7180 1 67.3 2 biotite conventional K-Ar 25. USGS(D)-W-86 "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 8.456 91 age of intrusion K2O=8.56 AND 8.58% "KRIEGER (1974, USGS MAP GQ-1106) REPORTED AN AGE OF 65.7 M.Y. FOR THIS BIOTITE" 7181 1 1320 40 muscovite conventional K-Ar 26. USGS(D)-W-38 "4.962E-04, 0.581E-04, 1.1167E-04" 10.48 292.5 99 K2O=10.46 AND 10.50% "KRIEGER (1974, USGS MAP GQ-1106) REPORTED AN AGE OF 1310 M.Y. FOR THIS MUSCOVITE; MUSCOVITE AGE MAY HAVE BEEN REDUCED BY THERMAL EFFECTS FROM NEARBY LARAMIDE INTRUSIVES" 7182 1 22.8 0.7 biotite conventional K-Ar 27. USGS(D)-W-10 "4.962E-04, 0.581E-04, 1.1167E-04" 8.645 2.855 74 age of volcanism K2O=8.67 AND 8.62% "KRIEGER (1974, USGS MAP GQ-1106) REPORTED AN AGE OF 22.3 M.Y. FOR THIS BIOTITE" 7189 1 25.5 0.6 biotite conventional K-Ar 34. USGS(D)-67-JDS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 3.409 84 age of intrusion "9.21, 9.19% K2O" "THIS AGE APPEARS CORRECT AS OTHER NEARBY IGNEOUS INTRUSIONS HAVE BEEN DATED AS MIOCENE. THE SANIDINE AGES ARE SPURIOUS; PROBABLY EXCESS ARGON IS PRESENT. A WHOLE-ROCK AGE OF 30-31 M.Y. IS REPORTED FOR THIS ROCK (POHLMANN, 1967) BUT THE AGE IS SPURIOUS" 7189 2 25.7 0.6 biotite conventional K-Ar 34. USGS(D)-67-JDS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 3.434 77 age of intrusion "9.21, 9.19% K2O" 7189 3 42.1 1 sanidine conventional K-Ar 34. USGS(D)-67-JDS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.56 5.857 91 "9.50, 9.52, 9.66% K2O" SPURIOUS AGE 7189 4 41.8 1 sanidine conventional K-Ar 34.USGS(D)-67-JDS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.56 5.817 91 SPURIOUS AGE 7190 1 134 20 glaucophane-crossite conventional K-Ar 35. USGS(D)-P-522 "4.962E-04, 0.581E-04, 1.1167E-04" 0.068 0.1362 25 "THE K-AR AGE GIVEN BY THECROSSITE IS APPARENTLY TOO YOUNG; THE PROBABLE AGE OF THE METAMORPHISM IS ABOUT 150 M.Y. (COLEMAN AND LANPHERE, 1971, GSA BULL., V. 82, P. 2397-2412)" 7191 1 89 13 glaucophane-crossite conventional K-Ar 36. USGS(D)-63-YB-107 "4.962E-04, 0.581E-04, 1.1167E-04" 0.05 0.0653 27 "THE AGE GIVEN BY THE CROSSITE APPEARS SPURIOUS; THE METAMORPHISM PROBABLY OCCURRED DURING THE JURASSIC (COLEMAN AND LANPHERE, 1971, GSA BULL., V. 82, P. 2397-2412)" 7192 1 130 12 glaucophane-crossite conventional K-Ar 37. USGS(D)-26-CZ-59 "4.962E-04, 0.581E-04, 1.1167E-04" 0.37 0.7181 81 "THE AGE REPRESENTS THE TIME OF METAMORPHISM AND AGREES WITH THE 131 M.Y. AGE (RECALCULATED) GIVEN BY COEXISTANT MUSCOVITE (PHENGITE)(LEE AND OTHERS, 1964, USGS PROF. PAPER 475-D) ALSO SEE COLEMAN AND LANPHERE, 1971" 7193 1 86 8 glaucophane-crossite conventional K-Ar 38. USGS(D)-57-RGC-58B "4.962E-04, 0.581E-04, 1.1167E-04" 0.11 0.1394 54 "THE AGE SEEMS MUCH TOO YOUNG. SEE LEE AND OTHERS, 1964" 7194 1 96 3 hornblende conventional K-Ar 39. USGS(M)-KA-399 "4.962E-04, 0.581E-04, 1.1167E-04" 1 1.414 87 age not evaluated "COMPTON (1966, P. 278), EVERNDEN AND KISTLER (1970, P. 4, ENTRY 249) AND MARVIN(1968) REPORTED AN AGE OF 92 M.Y. FOR THIS HORNBLENDE" 7195 1 4.16 0.41 plagioclase conventional K-Ar 40. USGS(M)-9-FS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7565 0.0453 14 "0.745, 0.768% K2O" "AGE APPEARS RELIABLE AND IS IN GOOD AGREEMENT WITH AGES OF OTHER TUFFS IN THIS REGION THAT HAVE BEEN DATED AND CORRELATED BY SARNA-WOJCICKI (1976, USGS PROF. PAPER 972)" 7196 1 3.33 0.23 plagioclase conventional K-Ar 41. USGS(M)-7-218E-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.726 0.0349 23 "0.725, 0.727% K2O" "PLAGIOCLASE CONCENTRATE OBTAINED FROM PUMICE BOMBS IN ASH-FLOW TUFF OF SONOMA VOLCANICS, EXTREME SOUTHEASTERN PART OF GEOGRAPHIC OCCURRENCE. THE CALCULATED AGE IS YOUNGER THAN OTHER AGES OBTAINED FOR TUFFS IN WEST-CENTRAL CALIFORNIA (SARNA-WOJCICKI, USGS PROF. PAPER 972)." 7198 1 plagioclase 43. USGS(M)-1-KA-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4405 0 0 "0.440, 0.441% K2O" "NO AGE CALCULATED. CORRELATION OF THIS TUFF WITH OTHER RADIOMETRICALLY DATED TUFFS (SARNA-WOJCICKI, 1976, USGS PROF. PAPER 972) SUGGEST IT'S MOST PROBABLE AGE IS BETWEEN 0.4-1.1 M.Y." 7199 1 0.46 0.19 plagioclase conventional K-Ar 44. USGS(M)-2-KA-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.444 0.0029 6 "0.444, 0.444% K2O" "CORRELATION OF THIS TUFF WITH OTHER RADIOMETRICALLY DATED TUFFS (SARNA-WOJCICKI, 1976, USGS PROF. PAPER 972) SUGGEST THIS CALCULATED AGE IS RELIABLE" 7200 1 hornblende 45. USGS(M)-3-KA-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2975 0 0 NO AGE CALCULATED. STRATIGRAPHIC CONSIDERATIONS SUGGEST THAT TUFF IS LESS THAN 2.2 M.Y. OLD 7201 1 1.2 0.5 plagioclase conventional K-Ar 46. USGS(M)-4-KA-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.405 0.0068 3 maximum age of volcanism 0.404 AND 0.406% K2O "CORRELATION OF THIS TUFF WITH OTHER RADIOMETRICALLY DATED TUFFS (SARNA-WOJCICKI, 1976, USGS PROF. PAPER 973) SUGGESTS THAT THIS CALCULATED AGE IS IN THE CORRECT AGE RANGE; OTHER SAMPLES COLLECTED FROM THIS TUFF STRONGLY SUGGEST THAT THE PLAGIOCLASE IS, IN PART, OLDER, DETRITAL PLAGIOCLASE AND THAT THIS CALCULATED AGE IS A MAXIMUM AGE FOR THE TUFF." 7202 1 2.2 0.3 plagioclase conventional K-Ar 47. USGS(M)-5-KA-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4295 0.0136 10 MIXTURE OF CLEAR TO CHALKY-DISCOLORED GRAINS "0.430, 0.429% K2O" AGE APPEARS TOO OLD; PROBABLY PRESENCE OF DETRITAL PLAGIOCLASE 7202 2 0.7 0.5 plagioclase conventional K-Ar 47. USGS(M)-6-KA-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4295 0.0044 3 CLEAR GRAINS "0.431, 0.428% K2O" "CORRELATION OF THIS TUFF WITH OTHER RADIOMETRICALLY DATED TUFFS (SARNA-WOJCICKI, 1976, USGS PROF. PAPER 972) SUGGESTS THAT THIS CALCULATED AGE IS IN THE CORRECT AGE RANGE, 0.4-1.1 M.Y." 7203 1 11.7 0.5 whole rock conventional K-Ar 48. USGS(D)-742-45 "4.962E-04, 0.581E-04, 1.1167E-04" 1.24 0.2104 62 age of intrusion "1.24, 1.27% K2O" "MIOCENE ANDESITE PLUG OR VOLCANIC NECK (BATEMAN AND WONES, 1972)" 7205 1 7.35 0.22 whole rock conventional K-Ar 50. USGS(M)-JFM74421A "4.962E-04, 0.581E-04, 1.1167E-04" 0.838 0.0889 33 age of volcanism 7206 1 6.05 0.18 biotite conventional K-Ar 51. USGS(M)-JFM75513A "4.962E-04, 0.581E-04, 1.1167E-04" 8.07 0.7039 52 age not evaluated "8.10, 8.04% K2O" "VIROPHYRE IS THE LOWEST UNALTERED ROCK IN THE VOLCANIC FACIES OF THE FURNACE CREEK FORMATION IN TYPE AREA. A VITROPHYRE IN THE UPPER PART OF THE VOLCANIC FACIES GAVE A BIOTITE AGE OF 5.18 +/- 0.15 M.Y. (MCALLISTER, 1973, USGS MAP I-782)" 7210 1 21.3 0.6 plagioclase conventional K-Ar 55. USGS(M)-GV-72-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.506 0.1561 49 age of volcanism "0.509, 0.503% K2O" 7211 1 189 5 whole rock conventional K-Ar 56. USGS(D)-74FP-1 "4.962E-04, 0.581E-04, 1.1167E-04" 3.94 11.3 95 minimum age of metamorphic crystallization "3.94, 3.94% K2O" "QUITE LIKELY, THIS AGE DOES NOT DATE THE TIME OF METAMORPHISM BUT MAY REFLECT THE THERMAL EFFECT ON THIS ROCK BY NEARBY LARGE GRANITOID PLUTONS." 7219 1 194 0.5 biotite conventional K-Ar 64. USGS(D)-M-Q-4 "4.962E-04, 0.581E-04, 1.1167E-04" 8.805 2.471 71 age of volcanism "8.83, 8.78% K2O" 7219 2 18.6 0.8 hornblende conventional K-Ar 64. USGS(D)-M-Q-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.2102 27 age of volcanism "0.77, 0.79% K2O" 7220 1 17.4 0.4 whole rock conventional K-Ar 65. USGS(D)-MWC-30-76 "4.962E-04, 0.581E-04, 1.1167E-04" 2.46 0.6202 48 minimum age of volcanism -60+100 MESH "2.49, 2.50, 2.37, 2.47% K2O" "IT DIRECTLY UNDERLIES THE TUFF OF PEACH SPRINGS (YOUNG AND BRENNAN, 1974) WHICH HAS AN APPARENT AGE OF 18.9 M.Y. (AVERAGE OF 19.2 M.Y.-BIOTITE AND 18.6 M.Y.-SANADINE--MARVIN AND DOBSON, 1979, P. 11, ENTRY 69). THE BASALT FLOW IS THUS AT LEAST 18.9 M.Y. OLD; ITS CALCULATED AGE APPEARS TOO YOUNG. THERE MAY HAVE BEEN DIFFUSIVE LOSS OF RADIOGENIC ARGON FROM THE ROCK." 7221 1 14.9 0.3 whole rock conventional K-Ar 66. USGS(D)-MWC-31-76 "4.962E-04, 0.581E-04, 1.1167E-04" 1.55 0.3331 58 -60+100 MESH "1.57, 1.56, 1.52, 1.56% K2O" "BASALT DIRECTLY UNDERLIES THE TUFF OF PEACH SPRINGS WHICH HAS AN APPARENT AGE OF 18.9 M.Y. (MARVIN AND DOBSON, 1979, P. 11, ENTRY 69) BECAUSE OF ITS CLOSE ASSOCIATION WITH THE TUFF OF PEACH SPRINGS, AN AGE OF 14.9 M.Y. SEEMS TOO YOUNG." 7222 1 6.1 0.2 whole rock conventional K-Ar 67. USGS(D)-MWC-72-74 "4.962E-04, 0.581E-04, 1.1167E-04" 2.09 0.1835 28 age of volcanism -60+100 MESH "2.08, 2.10% K2O" 7223 1 87.9 2.1 biotite conventional K-Ar 68. USGS(D)-MWC-39-74 "4.962E-04, 0.581E-04, 1.1167E-04" 9.655 12.52 96 age of intrusion "9.65, 9.66% K2O" 7223 2 90.7 1.4 orthoclase conventional K-Ar 68. USGS(D)-MWC-39-74 "4.962E-04, 0.581E-04, 1.1167E-04" 13.69 18.33 92 age of intrusion "13.66, 13.72% K2O" 7224 1 19.2 0.5 biotite conventional K-Ar 69. USGS(D)-MWC-79-74 "4.962E-04, 0.581E-04, 1.1167E-04" 8.2 2.282 67 age of volcanism BIOTITE FLAKES EDGED WITH IRON OXIDES(?) "8.17, 8.23% K2O" 7224 2 18.6 0.4 sanidine conventional K-Ar 69. USGS(D)-MWC-79-74 "4.962E-04, 0.581E-04, 1.1167E-04" 9.135 2.459 85 age of volcanism "9.12, 9.15% K2O" 7225 1 27 1.6 sanidine conventional K-Ar 70. COL2-35-1A "4.962E-04, 0.581E-04, 1.1167E-04" 4.656 1.826 32 age of volcanism "-60+200 MESH, 10% ROCK FRAGMENTS" "3.87, 3.86 K; 0.0071, 0.0075 PPM AR" "OLMSTED AND OTHERS (1973, USGS PROF. PAPER 486-H) REPORTED AN AGE OF 26.2 M.Y. FOR THIS SANIDINE" 7226 1 25.4 2.2 hornblende conventional K-Ar 71. PED-1-67 "4.962E-04, 0.581E-04, 1.1167E-04" 0.887 0.326 22 age of volcanism "ANALYTICAL DATA FROM DAMON AND OTHERS (1968, P.44). OLMSTED AND OTHERS (1973, USGS PROF. PAPER 486-H) REPORTED AN AGE OF 24.7 M.Y. FOR THIS HORNBLENDE." 7227 1 25.8 1.6 whole rock conventional K-Ar 72. HC2-15-35B "4.962E-04, 0.581E-04, 1.1167E-04" 1.84 0.686 17 age of volcanism "OLMSTED AND OTHERS (1973, USGS PROF. PAPER 486-H) REPORTED AN AGE OF 25.1 M.Y. FOR THIS WHOLE-ROCK. ANALYTICAL DATA FROM DAMON AND OTHERS (1970, P.41, SAMPLE PED-8-68)." 7228 1 26.8 0.9 biotite conventional K-Ar 73. COL2-7-38A "4.962E-04, 0.581E-04, 1.1167E-04" 7.08 2.752 3121 age of volcanism "-40+100 MESH, LESS THAN 5% IMPURITIES" "5.84%, 5.92% K; 0.0112, 0.0109 PPM AR" "OLMSTED AND OTHERS (1973, USGS PROF. PAPER 486-H) REPORTED AN AGE OF 25.9 M.Y. FOR THIS SAMPLE. TUFF UNDERLIES A 25.4 M.Y. OLD HORNBLENDE ANDESITE (MARVIN AND DOBSON, 1979, P. 11, ENTRY 71)." 7235 1 1350 30 biotite conventional K-Ar 80. USGS(D)-SLOAN-2 "4.962E-04, 0.581E-04, 1.1167E-04" 7.72 222.9 99 "7.72, 7.72% K2O" THE CARBONATITE BLOCKS IN THE DEVONIAN(?) DIATREME ARE APPARENTLY FROM THE PRECAMBRIAN BASEMENT 7236 1 36.3 0.9 biotite conventional K-Ar 81. USGS(D)-A "4.962E-04, 0.581E-04, 1.1167E-04" 8.81 4.655 94 "8.81, 8.81% K2O" "THE RHYOLITIC ASH-FLOW IS OLIGOCENE IN AGE. HOWEVER THE 6 M.Y. AGE DIFFERENCE BETWEEN THE K-AR AND FISSION-TRACK AGES IS NOT UNDERSTOOD. THE K-AR AGE OF 36 M.Y. SUGGESTS THAT THIS ASH-FLOW MAY BE AN EARLY EXTRUSIVE PHASE FROM THE MOUNT SOPRIS IGNEOUS CENTER WHICH HAS BEEN DATED AT 34 M.Y. (MOUNT SOPRIS STOCK) (CUNNINGHAM AND OTHERS, 1977, USGS OPEN-FILE REPORT 77-573)." 7237 1 483 24 biotite conventional K-Ar 82. USGS(W)-2-D-62 "4.962E-04, 0.581E-04, 1.1167E-04" 8.72 69.56 99 THIS IS A REDUCED AGE. GNEISS PROBABLY FORMED ABOUT 1700 M.Y. AGO. IGNEOUS INTRUSIVE ACTIVITY IN THIS VICINITY ABOUT 65 M.Y. AGO CAUSED BIOTITE TO LOSE RADIOGENIC ARGON 7238 1 1150 30 biotite conventional K-Ar 83. USGS(D)-91 "4.962E-04, 0.581E-04, 1.1167E-04" 6.17 143.6 99 "6.14, 6.20% K2O" "GRANITE IS ABOUT 1450 M.Y. OLD (PETERMAN AND OTHERS, 1968). THIS K-AR AGE MAY INDICATE A TIME OF UPLIFT AND COOLING." 7239 1 63 1.5 sericite conventional K-Ar 84. USGS(D)-72-92 "4.962E-04, 0.581E-04, 1.1167E-04" 2.475 2.285 81 IMPURE SERICITE "2.48, 2.47% K2O" K-AR AGE PROBABLY DATES THE TIME OF ALTERATION; TIME OF EMPLACEMENT IS SOMEWHAT OLDER. 7240 1 42.4 1 biotite conventional K-Ar 85. USGS(D)-D96 "4.962E-04, 0.581E-04, 1.1167E-04" 9.025 5.577 86 -40+100 MESH "9.03, 9.02% K2O" "FOUR PUBLISHED K-AR AGES FOR THE HUMBUG STOCK RANGE FROM 47 TO 35 M.Y. (MARVIN AND OTHERS, 1974, P. 14-15" 7241 1 41.5 1 biotite conventional K-Ar 86. USGS(D)-K150 "4.962E-04, 0.581E-04, 1.1167E-04" 7.935 4.796 87 -60+100 MESH "7.95, 7.92% K2O" "FOUR PUBLISHED K-AR AGES FOR THE HUMBUG STOCK RANGE FROM 47 TO 35 M.Y. (MARVIN AND OTHERS, 1974, P. 14-15)" 7242 1 71.2 1.7 biotite conventional K-Ar 87. USGS(D)-MG-4 "4.962E-04, 0.581E-04, 1.1167E-04" 6.935 7.251 82 age of intrusion "6.93, 6.94% K2O" "THIS AGE SUPERSEDES AGES LISTED BY MARVIN AND OTHERS (1974, P. 28, ENTRY 203)." 7243 1 69.9 1.7 biotite conventional K-Ar 88. USGS(D)-HBD-4 "4.962E-04, 0.581E-04, 1.1167E-04" 4.98 5.11 83 BIOTITE SOMEWHAT CHLORITIZED "4.96, 5.00% K2O" "AGE SUPERSEDES AGES LISTED BY MARVIN AND OTHERS (1974, P. 28, ENTRY 203); AGE APPEARS SLIGHTLY TOO OLD AS DIKE CUTS GRANODIORITE WHICH IS 66.7 M.Y. OLD (MARVIN AND DOBSON, 1979, P. 13, ENTRY 89)" 7244 1 66.7 1.6 biotite conventional K-Ar 89. USGS(D)-LG-15 "4.962E-04, 0.581E-04, 1.1167E-04" 7.425 7.268 86 "7.47, 7.38% K2O" "THIS AGE SUPERSEDES AGES LISTED BY MARVIN AND OTHERS (1974, P. 28, ENTRY 203)" 7245 1 709 12 K feldspar conventional K-Ar 90. USGS(D)-D2377F "4.962E-04, 0.581E-04, 1.1167E-04" 12.84 160.6 99 "98-99% PURE, A FEW GRAINS SHOW GRID-TWINNING. X-RAY SCANS INDICATE ORTHOCLASE AND PLAGIOCLASE." "12.92, 12.76% K2O" "K-AR AGE IS COMPOSITE AGE OF YOUNG AND OLD K-FELDSPAR--ADULARIA(?) AND PRECAMBRIAN HOSTROCK FELDSPAR. YOUNG (1977, USGS OPEN-FILE 77-725) REPORTED AN AGE OF 700 M.Y. FOR THIS SAMPLE." 7246 1 175 3 K feldspar conventional K-Ar 91. USGS(D)-D2378F "4.962E-04, 0.581E-04, 1.1167E-04" 14.335 37.92 96 "98-99% PURE, A FEW GRAINS SHOW GRID-TWINNING. X-RAY SCANS INDICATE ORTHOCLASE AND ADULARIA" "14.33, 14.34% K2O" "K-AR AGE IS COMPOSITE AGE OF YOUNG AND OLD K-FELDSPAR--ADULARIA FROM MINERALIZING SOLUTIONS AND PRECAMBRIAN HOSTROCK FELDSPAR. YOUNG (1977, USGS OPEN-FILE 77-725) REPORTED AN AGE OF 175 M.Y. FOR THIS SAMPLE." 7247 1 1455 35 muscovite conventional K-Ar 92. USGS(D)-SCH-74 "4.962E-04, 0.581E-04, 1.1167E-04" 9.45 304.9 99 minimum age of intrusion "9.56, 9.34% K2O" 7248 1 1415 35 muscovite conventional K-Ar 93. USGS(D)-SCH-164 "4.962E-04, 0.581E-04, 1.1167E-04" 9.475 292.6 100 minimum age of intrusion "9.43, 9.52% K2O" AGE IS A MINIMUM AGE FOR THE PEGMATITES; THE SHEARING MAY HAVE CAUSED A LOSS OF RADIOGENIC ARGON 7251 1 74.3 1.8 zircon conventional K-Ar 96. USGS(D)-MC-15-74 "4.962E-04, 0.581E-04, 1.1167E-04" 4.35 4.751 73 BIOTITE SOMEWHAT ALTERED "4.34, 4.36% K2O" A SPURIOUS AGE; PALEOCENE FLORA OCCUR A BIT LOWER IN THE SECTION 7252 1 56.5 1.4 biotite conventional K-Ar 97. USGS(D)-MC-31-74 "4.962E-04, 0.581E-04, 1.1167E-04" 5.885 4.859 53 age of volcanism "5.83, 5.94% K2O" 7283 1 57.5 2 hornblende conventional K-Ar 128. USGS(D)-WGJH-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.04 0.8749 89 age of intrusion "1.02, 1.02, AND 1.07% K2O" 7284 1 5190 940 plagioclase conventional K-Ar 129. USGS(D)-WGJH-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.17 74.09 98 "0.16, 0.18% K2O" SPURIOUS AGE--PLAGIOCLASE LOADED WITH EXCESS ARGON. DIKE IS PROBABLY CRETACEOUS OR PALEOCENE IN AGE. 7285 1 10.2 0.4 whole rock conventional K-Ar 130. USGS(D)-MW-48 "4.962E-04, 0.581E-04, 1.1167E-04" 0.79 0.1167 41 age of intrusion -60+100 MESH "MC INTYRE (1976) PUBLISHED THE AGE OF THIS SAMPLE AS 10.0 M.Y. DATED DIKE IS AT LOCALITY ""H"" ON USGS MAP MF-745 (MC INTYRE, 1976) AND ALSO APPEARS ON FIG. 9 (ROSS, 1956) AS ""BIOTITE ANDESITE DIKE""." 7286 1 48.5 1.2 biotite conventional K-Ar 131. USGS(D)-BL-128 "4.962E-04, 0.581E-04, 1.1167E-04" 7.755 5.488 78 age of volcanism "7.77, 7.74% K2O" THE AGE IS CONSISTENT WITH STRATIGRAPHIC RELATIONS AS PRESENTLY UNDERSTOOD FOR A SERIES OF COMPLEXLY FAULTED FLOWS. 7287 1 42.8 1 sanidine conventional K-Ar 132. USGS(D)-B-64 "4.962E-04, 0.581E-04, 1.1167E-04" 8.17 5.097 83 "8.18, 8.16% K2O" THIS AGE DOES NOT FIT THE MAPPED STRATIGRAPHIC RELATIONS; THE AGE IS APPARENTLY TOO YOUNG 7288 1 160 4 hornblende conventional K-Ar 133. USGS(D)-T118A "4.962E-04, 0.581E-04, 1.1167E-04" 0.445 1.074 65 "0.444, 0.446% K2O" "AGE IS SPURIOUS; STOCK IS PROBABLY ABOUT 85 M.Y. OLD (SEE MARVIN AND DOBSON, 1979, P. 17, ENTRY 135)" 7289 1 49.2 1.2 biotite conventional K-Ar 134. USGS(D)-C-226 "4.962E-04, 0.581E-04, 1.1167E-04" 7.535 5.408 80 age of volcanism "7.50, 7.57% K2O" AGE IS CONSISTANT WITH STRATIGRAPHIC RELATIONS AS PRESENTLY UNDERSTOOD FOR A SERIES OF COMPLEXLY FAULTED FLOWS 7290 1 85.6 2.1 biotite conventional K-Ar 135. USGS(D)-876A "4.962E-04, 0.581E-04, 1.1167E-04" 7.3 9.212 88 age of intrusion "7.31, 7.29% K2O; X-RAY FLUORESCENCE OF POWDERED WHOLE-ROCK GAVE 89 PPM RB AND 874 PPM SR, RB/SR=0.1" 7291 1 92.2 2.2 biotite conventional K-Ar 136. USGS(D)-74-T-ID "4.962E-04, 0.581E-04, 1.1167E-04" 7.75 10.55 34 age of intrusion "7.74, 7.76% K2O" 7292 1 440 14 muscovite conventional K-Ar 137. USGS(D-M)-CM-5 "4.962E-04, 0.581E-04, 1.1167E-04" 10.34 74.21 95 age of intrusion "10.37, 10.31% K2O" CADY (1969) PUBLISHED AN AGE OF 433 M.Y. FOR THIS MUSCOVITE 7306 1 58 3 muscovite conventional K-Ar 151. USGS(W)-CPR369 "4.962E-04, 0.581E-04, 1.1167E-04" 10.46 8.83 86 minimum age of intrusion 7307 1 51.1 1.2 whole rock conventional K-Ar 152. USGS(D)-KW-39-74 "4.962E-04, 0.581E-04, 1.1167E-04" 2.645 1.973 90 age of intrusion "2.64, 2.65% K2O" 7308 1 1720 50 muscovite conventional K-Ar 153. USGS(D)-63R6 "4.962E-04, 0.581E-04, 1.1167E-04" 10.32 426 99 age of intrusion LARGE MUSCOVITE SHEETS CUT UP WITH SCISSORS 7309 1 1740 90 hornblende conventional K-Ar 154. USGS(D)-63R8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 40.5 99 minimum age of metamorphic crystallization K-AR HORNBLENDE AGE IS MINIMUM AGE OF GNEISS. 7310 1 826 41 pyroxenes conventional K-Ar 155. USGS(D)-63R4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.38 5.73 89 age of intrusion PYROXENE PLUS MINOR BIOTITE "SILL IS PART OF THE WIDE-SPREAD, LATE PRECAMBRIAN OR EARLY PRECAMBRIAN-Z, MAFIC DIKES AND SILLS THAT HAVE BEEN MAPPED IN THE BELT SUPERGROUP" 7311 1 744 37 pyroxenes conventional K-Ar 156. USGS(D)-63R5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.42 5.57 92 age of intrusion PYROXENE PLUS MINOR BIOTITE "SILL IS PART OF THE WIDE SPREAD, EARLY PRECAMBRAIN-Z MAFIC DIKES AND SILLS THAT HAVE BEEN MAPPED IN THE BELT SUPERGROUP" 7312 1 82.4 4.1 amphiboles conventional K-Ar 157. A-2929 "4.962E-04, 0.581E-04, 1.1167E-04" 0.834 1.012 19 age of intrusion -40+60 MESH "0.649, 0.735% K; 0.004252, 0.003833 PPM AR-40" 7313 1 81.8 3.1 biotite conventional K-Ar 158. B-2930 "4.962E-04, 0.581E-04, 1.1167E-04" 6.426 7.739 58 age of intrusion -80+200 MESH "5.327, 5.342% K; 0.03128, 0.03057 PPM AR-40" 7319 1 73.1 3.1 biotite conventional K-Ar 164. USGS(D)-T-158 "4.962E-04, 0.581E-04, 1.1167E-04" 7.77 8.341 88 AGE MAY BE A REDUCED AGE; PLUTON MAY HAVE BEEN EMPLACED DURING THE JURASSIC 7321 1 30.3 2.6 biotite conventional K-Ar 166. USGS(D+W)-T-1043 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 3.916 72 age of intrusion 7322 1 29 1 biotite conventional K-Ar 167. USGS(D+W)-63T1029 "4.962E-04, 0.581E-04, 1.1167E-04" 8.37 3.538 74 "THIS K-AR AGE IS A REDUCED AGE, CAUSED BY INTRUSION OF TERTIARY GRANODIORITE (SEE MARVIN AND DOBSON, 1979, P. 21 ENTRY 166)" 7323 1 40 2 biotite conventional K-Ar 168. USGS(W)-JG-GM-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.36 4.303 85 age of intrusion 7323 2 40 2 biotite conventional K-Ar 168. USGS(W)-JG-GM-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.36 4.328 89 age of intrusion 7325 1 32 1 sanidine conventional K-Ar 170. USGS(D)-SR-476 "4.962E-04, 0.581E-04, 1.1167E-04" 7.075 3.285 90 age of volcanism "7.09, 7.06% K2O" SMITH AND KETNER(1976) REPORTED AN AGE OF 31.2 M.Y. FOR THIS SANIDINE 7326 1 32.6 1.1 whole rock conventional K-Ar 171. USGS(W)-SR-425 "4.962E-04, 0.581E-04, 1.1167E-04" 2.475 1.174 86 age of volcanism "2.48, 2.47% K2O" SMITH AND KETNER(1976) REPORTED AN AGE OF 31.9 M.Y. FOR THIS BASALT SAMPLE 7327 1 38.5 1.3 biotite conventional K-Ar 172. USGS(D)-SR-377 "4.962E-04, 0.581E-04, 1.1167E-04" 6.6 3.698 85 age of volcanism "6.61, 6.59% K2O" SMITH AND KETNER(1976) REPORTED AN AGE OF 37.6 M.Y. FOR THIS BIOTITE 7328 1 37.3 1.9 biotite conventional K-Ar 173. USGS(W)-667 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 4.654 83 age of intrusion 7329 1 36.3 1.1 sanidine conventional K-Ar 174. USGS(D)-SR-442 "4.962E-04, 0.581E-04, 1.1167E-04" 11.76 6.21 92 age of intrusion SMITH AND KETNER(1976) REPORTED AN AGE OF 35.4 M.Y. FOR THIS SANIDINE 7329 2 37.8 1.1 biotite conventional K-Ar 174. USGS(D)-SR-442 "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 4.83 82 age of intrusion SMITH AND KETNER(1976) REPORTED AN AGE OF 36.8 M.Y. FOR THIS BIOTITE 7334 1 69.5 1.7 muscovite conventional K-Ar 179. USGS(D)-74FP-890B "4.962E-04, 0.581E-04, 1.1167E-04" 9.92 10.12 87 "10.10, 10.08, 9.86, 9.61% K2O" LATE CRETACEOUS MINERALIZATION 7335 1 79.2 1.6 muscovite conventional K-Ar 180. USGS(D)-DRS-122-67 "4.962E-04, 0.581E-04, 1.1167E-04" 10.905 12.71 88 "10.89, 10.92% K2O" TIME OF MINERALIZATION. SHAWE(1977) REPORTED AN AGE OF 79.2 M.Y. FOR THIS MUSCOVITE 7353 1 241 12 biotite conventional K-Ar 198. USGS(W)-BT-30 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 32.28 95 initial age disturbed by later metamorphism SOUTHWICK(1964) REPORTED AN AGE OF 236 M.Y. FOR THIS BIOTITE. MICROCLINE HAD AN UNSUITABLE RB/SR RATIO FOR DATING PURPOSES. 7363 1 38.2 1.5 biotite conventional K-Ar 208. USGS(D)-JIC-50 "4.962E-04, 0.581E-04, 1.1167E-04" 7.105 3.952 80 age of intrusion "7.13, 7.08% K2O" SEGERSTROM AND RYBERG (1974) REPORTED AN AGE OF 37.3 M.Y. FOR THIS BIOTITE 7364 1 26.8 0.6 sanidine conventional K-Ar 209. USGS(D)-SA-5 "4.962E-04, 0.581E-04, 1.1167E-04" 7.795 3.034 84 age of volcanism "7.84, 7.75% K2O" RATTE AND GASKILL (1975) REPORTED AN AGE OF 26.2 M.Y. FOR THIS SANIDINE 7364 2 28.2 0.7 biotite conventional K-Ar 209. USGS(D)-SA-5 "4.962E-04, 0.581E-04, 1.1167E-04" 6.66 2.728 67 age of volcanism "6.70, 6.62% K2O" RATTE AND GASKILL (1975) REPORTED AN AGE OF 27.6 M.Y. FOR THIS BIOTITE 7366 1 31.7 0.8 biotite conventional K-Ar 211. USGS(D)-SA-3 "4.962E-04, 0.581E-04, 1.1167E-04" 7.755 3.575 60 age of volcanism "7.72, 7.79% K2O" RATTE AND GASKILL (1975) REPORTED AN AGE OF 31.0 M.Y. FOR THIS BIOTITE 7367 1 33.5 0.8 biotite conventional K-Ar 212. USGS(D)-SA-4 "4.962E-04, 0.581E-04, 1.1167E-04" 8.13 3.956 74 age of volcanism "8.15, 8.11% K2O" RATTE AND GASKILL (1975) REPORTED AN AGE OF 32.7 M.Y. FOR THIS BIOTITE 7368 1 30.4 0.7 K feldspar conventional K-Ar 213. USGS(D)-SA-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.635 3.814 74 age of volcanism "8.66, 8.61% K2O" RATTE AND GASKILL (1975) REPORTED AN AGE OF 29.7 M.Y. FOR THIS K-FELDSPAR 7369 1 30 0.7 sanidine conventional K-Ar 214. USGS(D)-SA-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.55 4.157 92 age of volcanism "9.52, 9.58% K2O" RATTE AND GASKILL (1975) PUBLISHED AN AGE OF 29.3 M.Y. FOR THIS SANIDINE 7369 2 30.3 0.7 biotite conventional K-Ar 214. USGS(D)-SA-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 3.838 84 age of volcanism "8.71, 8.75% K2O" RATTE AND GASKILL (1975) PUBLISHED AN AGE OF 29.6 M.Y. FOR THIS BIOTITE 7370 1 34.8 0.8 whole rock conventional K-Ar 215. USGS(D)-J-1-71 "4.962E-04, 0.581E-04, 1.1167E-04" 5.465 2.76 65 age of intrusion "5.50, 5.43% K2O" 7371 1 915 33 biotite conventional K-Ar 216. USGS(D)-AZ-9 "4.962E-04, 0.581E-04, 1.1167E-04" 8.01 137.5 98 minimum age of intrusion "8.00, 8.02% K2O" 7372 1 893 32 biotite conventional K-Ar 217. USGS(D)-AZ-6 "4.962E-04, 0.581E-04, 1.1167E-04" 7.07 117.6 97 minimum age of intrusion "7.08, 7.06% K2O" 7377 1 37.1 3.6 plagioclase conventional K-Ar 222. USGS(D)-SR-63-45 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.124 41 age of volcanism "0.23, 0.23% K2O" TATSUMOTO AND SNAVELY(1969) PUBLISHED AN AGE OF 36.6 M.Y. FOR THIS PLAGIOCLASE 7378 1 33.2 1 biotite conventional K-Ar 223. USGS(D)-SR-59-9 "4.962E-04, 0.581E-04, 1.1167E-04" 5.84 2.82 81 age of intrusion "5.81, 5.89, 5.85, AND 5.82% K2O" TATSUMOTO AND SNAVELY(1969) PUBLISHED AN AGE OF 32.6 M.Y. FOR THIS BIOTITE 7380 1 34.6 1.2 hornblende conventional K-Ar 225. USGS(D)-SR-59-9 "4.962E-04, 0.581E-04, 1.1167E-04" 1 0.5029 59 age of intrusion TATSUMOTO AND SNAVELY(1969) PUBLISHED AN AGE OF 33.6 M.Y. FOR THIS HORNBLENDE 7381 1 146 7 biotite conventional K-Ar 226. USGS(W)-CEB-61-75 "4.962E-04, 0.581E-04, 1.1167E-04" 8.02 17.6 95 age of intrusion THAYER AND BROWN (1964) REPORTED AN AGE OF 145 M.Y. FOR THIS BIOTITE 7382 1 121 6 biotite conventional K-Ar 227. USGS(W)-CEB-61-76 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 15.8 91 age of intrusion MICA DIORITE INTRUDES TRIASSIC AND JURASSIC SEDIMENTARY ROCKS. THAYER AND BROWN (1964) REPORTED AN AGE OF 120 M.Y. FOR THIS BIOTITE. 7387 1 482 24 hornblende conventional K-Ar 232. USGS(W)-DD491(350) "4.962E-04, 0.581E-04, 1.1167E-04" 0.33 2.627 79 AGE MAY INDICATE TIME OF THE LAST METAMORPHIC EVENT IN THIS REGION. KINKEL(1967) PUBLISHED AN AGE OF 478 M.Y. FOR THIS HORNBLENDE. 7388 1 1047 50 hornblende conventional K-Ar 233. USGS(W+D)-CALLOWAY NO. 1(349) "4.962E-04, 0.581E-04, 1.1167E-04" 0.24 4.904 93 SPURIOUS AGE; KINKEL(1967) PUBLISHED AN AGE OF 1045 M.Y. FOR THIS HORNBLENDE 7388 2 995 34 hornblende conventional K-Ar 233. USGS(W+D)-CALLOWAY NO. 1(349) "4.962E-04, 0.581E-04, 1.1167E-04" 0.28 5.354 93 REPLICATE POTASSIUM DETERMINATIONS "SPURIOUS AGE. AR-40/AR-39 AGES, AS DETERMINED BY R.D. DALLMEYER, UNIV. OF GEORGIA, RANGED FROM 742-2625 M.Y. --COMPILER." 7389 1 398 20 hornblende conventional K-Ar 234. USGS(W)-BOYD NO. 1(348) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5 3.203 91 "THIS AGE IS A MINIMUM AGE FOR THE VEIN. KINKEL(1967) PUBLISHED AN AGE OF 387 M.Y. FOR THIS HORNBLENDE. THE ARGON RELEASE PATTERN GIVEN BY THIS HORNBLENDE UNDER CONDITIONS OF INCREMENTAL HEATING SUGGESTS THE PRESENCE OF EXCESS ARGON ACCORDING TO R.D. DALLMEYER, UNIV. OF GEORGIA --COMPILER." 7391 1 39.1 2 biotite conventional K-Ar 236. USGS(D+W)-26-HM-64(600) "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 5.079 47 minimum age of intrusion 7392 1 36.4 1.8 hornblende conventional K-Ar 237. USGS(D)-21-HM-64(601) "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.5029 66 age of volcanism MINIMUM AGE OF UPLIFT AND EROSION OF MONZONITE PORPHYRY OF WEST TINTIC 7393 1 34.6 1.7 biotite conventional K-Ar 238. USGS(D+W)-11-HM-64(602) "4.962E-04, 0.581E-04, 1.1167E-04" 9 4.529 55 age of volcanism 7395 1 21.4 0.6 biotite conventional K-Ar 240. USGS(M)-61-282 "4.962E-04, 0.581E-04, 1.1167E-04" 8.15 2.527 75 THIS AGE APPEARS TO BE A REDUCED AGE AND MAY INDICATE THE TIME OF HYDROTHERMAL ACTIVITY. MARVIN(1968) REPORTED AN AGE OF 20.8 M.Y. FOR THIS BIOTITE. 7395 2 27.4 0.8 hornblende conventional K-Ar 240. USGS(M)-61-282 "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 0.1391 34 age of intrusion MARVIN(1968) REPORTED AN AGE OF 27.0 M.Y. FOR THIS HORNBLENDE 7396 1 28.8 0.9 hornblende conventional K-Ar 241. USGS(M)-61-283 "4.962E-04, 0.581E-04, 1.1167E-04" 0.36 0.1504 34 age of intrusion MARVIN(1968) PUBLISHED AN AGE OF 28.4 M.Y. FOR THIS HORNBLENDE 7397 1 21.5 0.6 biotite conventional K-Ar 242. USGS(M)-61-285 "4.962E-04, 0.581E-04, 1.1167E-04" 8.77 2.727 78 THIS AGE MAY INDICATE THE TIME OF HYDROTHERMAL ACTIVITY. MARVIN(1968) PUBLISHED AN AGE OF 20.9 M.Y. FOR THIS BIOTITE. 7398 1 28.7 0.9 biotite conventional K-Ar 243. USGS(M)-63-17 "4.962E-04, 0.581E-04, 1.1167E-04" 8.88 3.703 86 age of intrusion MARVIN(1968) PUBLISHED AN AGE OF 28.0 M.Y. FOR THIS BIOTITE 7399 1 22.5 0.7 sanidine conventional K-Ar 244. USGS(M)-61-284 "4.962E-04, 0.581E-04, 1.1167E-04" 9.06 2.952 95 minimum age of volcanism MARVIN(1968) PUBLISHED AN AGE OF 21.9 M.Y. FOR THIS SANIDINE 7400 1 23.1 0.7 biotite conventional K-Ar 245. USGS(M)-63-16 "4.962E-04, 0.581E-04, 1.1167E-04" 8.76 2.927 80 age of volcanism "8.73, 8.79% K2O" MARVIN(1968) PUBLISHED AN AGE OF 22.4 M.Y. FOR THIS BIOTITE 7401 1 29.8 0.9 biotite conventional K-Ar 246. USGS(M)-61-85 "4.962E-04, 0.581E-04, 1.1167E-04" 8.66 3.753 79 age of volcanism MARVIN(1968) REPORTED AN AGE OF 29.0 M.Y. FOR THIS BIOTITE 7401 2 29.9 0.9 hornblende conventional K-Ar 246. USGS(M)-61-85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.91 0.3953 66 age of volcanism MARVIN(1968) REPORTED AN AGE OF 29.2 M.Y. FOR THIS HORNBLENDE 7404 1 155 5 biotite conventional K-Ar 249. USGS(D)-D1033B AND H "4.962E-04, 0.581E-04, 1.1167E-04" 6.915 16.14 98 age of intrusion "6.88, 6.95% K2O" MARVIN(1968) REPORTED AN AGE OF 152 M.Y. FOR THIS BIOTITE 7404 2 155 10 hornblende conventional K-Ar 249. USGS(D)-D1033B AND H "4.962E-04, 0.581E-04, 1.1167E-04" 1.675 3.9 96 age of intrusion MARVIN(1968) REPORTED AN AGE OF 151 M.Y. FOR THIS HORNBLENDE 7405 1 554 16 hornblende conventional K-Ar 250. USGS(M)-SJ-13A "4.962E-04, 0.581E-04, 1.1167E-04" 0.3435 3.207 78 age not evaluated "0.346, 0.341% K2O" 7411 1 2210 110 biotite conventional K-Ar 256. USGS(W)-337 "4.962E-04, 0.581E-04, 1.1167E-04" 9.52 593 100 THIS AGE IS LOW; BIOTITE APPEARS TO HAVE LOST RADIOGENIC ARGON. BAYLEY AND OTHERS(1973) PUBLISHED THIS AGE. NAYLOR AND OTHERS(1970) DETERMINED AN AGE FOR THE LOUIS LAKE BATHOLITH OF 2600 M.Y. 7411 2 2630 130 hornblende conventional K-Ar 256. USGS(W)-337 "4.962E-04, 0.581E-04, 1.1167E-04" 0.93 79.56 100 age of intrusion BAYLEY AND OTHERS(1973) REPORTED AN AGE OF 2640 M.Y. FOR THIS HORNBLENDE 7412 1 1430 70 biotite conventional K-Ar 257. USGS(W)-338 "4.962E-04, 0.581E-04, 1.1167E-04" 5.12 160.4 99 THIS IS A REDUCED AGE AND MAY DATE A TIME OF FAULTING. BAYLEY AND OTHERS(1973) PUBLISHED AN AGE OF 1420 M.Y. FOR THIS BIOTITE AND A PB-ALPHA AGE OF 1240 M.Y. (ZIRCON) WHICH IS SPURIOUS. 7429 1 0.65 0.2 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.46 0.023 2 age of volcanism "K=2.04, 2.02%; 40AR-RAD=0.0217, 0.0242 E-10 MOL/GM" 7430 1 2.02 0.3 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.6 0.0758 9 age of volcanism K=2.16% "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 16, ENTRY 108." 7431 1 1.3 0.2 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 3.05 0.0569 16 age of volcanism K=2.53% "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, L974, P. 16, ENTRY 107." 7432 1 7.83 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.86 0.21 44 age of volcanism K=1.5% "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 24." 7433 1 8.91 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.143 0.147 49 age of volcanism K=0.949% "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 22." 7434 1 9.02 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.25 0.293 51 age of volcanism K=1.87% "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 25." 7435 1 10.39 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.3 0.195 26 age of volcanism K=1.08% 7436 1 11.48 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.16 0.358 7 age of volcanism K=1.80% "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 26." 7437 1 10.6 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.57 0.3932 age of volcanism "K=2.17, 2.11%" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 5, ENTRY 11." 7438 1 9.86 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.15 0.3062 age of volcanism "K=1.78, 1.79%; 40AR-RAD=0.3217, 0.2906 E-10 MOL/GM" "THIS AGE REPORTED BY MARVIN AND OTHERS, 1974, P. 5, ENTRY 12." 7439 1 12.78 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.645 0.3038 age of volcanism "K=1.35, 1.38%; 40AR-RAD=0.3089, 0.2987 E-10 MOL/GM" "MARVIN AND OTHER (1974, P. 5, ENTRY 13) REPORTED AN AGE OF 12.4 M.Y. FOR THIS SAMPLE." 7440 1 13.39 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 3.17 0.6135 8455 age of volcanism "K=2.58, 2.69%; 40AR-RAD=0.606, 0.621 E-10 MOL/GM" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 5, ENTRY 14." 7441 1 13.64 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 2.75 0.542 40 age of volcanism K=2.29% 7442 1 20.84 0.8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.645 0.4965 2625 age not evaluated "K=1.350, 1.375%, 40AR-RAD=0.477, 0.516 E-10 MOL/GM" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 21." 7443 1 20.3 0.8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.944 0.5715 4347 age not evaluated "K=1.612, 1.615%; 40AR-RAD=0.560, 0.583 E-10 MOL/GM" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 20." 7444 1 20.9 0.8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 3.27 0.9897 4447 age not evaluated "K=2.74, 2.70%; 40AR-RAD=1.006, 0.9735 E-10 MOL/GM" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 19." 7445 1 19.04 0.8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.2755 39 age not evaluated "K=0.832, 0.828%" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 6, ENTRY 18." 7446 1 22.42 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.013 0.329 3534 age not evaluated "K=0.859, 0.823%; 40AR-RAD=0.344, 0.314 E-10 MOL/GM" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 5 ENTRY 17." 7447 1 21.68 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.6 0.5024 53 age not evaluated "K=1.35, 1.31%" "THIS AGE HAS BEEN REPORTED BY MARVIN AND OTHERS, 1974, P. 5, ENTRY 16." 7448 1 22.27 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.46 0.4711 58 age not evaluated "K=1.18, 1.24%" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 5, ENTRY 15" 7449 1 22.97 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.025 0.3412 47 age of volcanism "K=0.857, 0.845%" "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, P. 5, ENTRY 10." 7450 1 23.2 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 2.82 21 age of volcanism "K=2.37, 2.311%" 7451 1 22.1 1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 1.1641 46 age of volcanism "K=0.9674, 0.9648%" 7452 1 353 5 whole rock conventional K-Ar 8 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.35 18.76 88 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE. 7453 1 420 4 whole rock conventional K-Ar 9 WR "4.962E-04, 0.581E-04, 1.1167E-04" 6.16 41.82 27 -40 +80 MESH SIZE LOW MEASUREMENT OF RADIOGENIC ARGON DUE TO LEAK IN GLASS SYSTEM AGE PROBABLY A COOLING AGE. 7454 1 421 5 whole rock conventional K-Ar 10 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.65 24.92 96 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE. 7455 1 379 5 whole rock conventional K-Ar 21 WR "4.962E-04, 0.581E-04, 1.1167E-04" 5.24 31.75 98 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7456 1 431 3 whole rock conventional K-Ar 22 WR "4.962E-04, 0.581E-04, 1.1167E-04" 4.31 30.18 98 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE. 7457 1 491 5 whole rock conventional K-Ar 23 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.08 25.01 97 age of metamorphic crystallization -40 +80 MESH SIZE MINIMUM AGE OF F-1 FOLDING 7458 1 438 4 whole rock conventional K-Ar 24 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.36 23.98 97 -40 +80 MESH SIZE PROBABLY A COOLING AGE 7459 1 368 4 whole rock conventional K-Ar 25 WR "4.962E-04, 0.581E-04, 1.1167E-04" 4.18 24.52 96 -40 +80 MESH SIZE (ANALYTICAL DATA OF THIS SAMPLE WAS REVERSED WITH SAMPLE NO. 27 IN THE THESIS--COMPILER) PROBABLY A COOLING AGE. 7460 1 481 4 whole rock conventional K-Ar 26 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.22 25.49 98 age of metamorphic crystallization -40 +80 MESH SIZE MINIMUM AGE OF F-1 FOLDING 7461 1 393 3 whole rock conventional K-Ar 27 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.12 19.69 96 -40 +80 MESH SIZE (ANALYTICAL DATA OF THIS SAMPLE WAS REVERSED WITH SAMPLE NO. 25 IN THE THESIS--COMPLIER PROBABLY A COOLING AGE 7462 1 483 5 whole rock conventional K-Ar 28 WR "4.962E-04, 0.581E-04, 1.1167E-04" 2.99 23.81 94 age of metamorphic crystallization -40 +80 MESH SIZE MINIMUM AGE OF F-1 FOLDING 7463 1 275 6 muscovite conventional K-Ar 32 M "4.962E-04, 0.581E-04, 1.1167E-04" 3.65 15.59 90 -40 +80 MESH SIZE PROBABLY A COOLING AGE 7464 1 351 4 whole rock conventional K-Ar 33 WR "4.962E-04, 0.581E-04, 1.1167E-04" 6.07 33.83 98 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7465 1 369 6 whole rock conventional K-Ar 34 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.22 18.97 95 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7466 1 393 3 whole rock conventional K-Ar 35 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.58 22.6 97 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7467 1 388 3 whole rock conventional K-Ar 36 WR "4.962E-04, 0.581E-04, 1.1167E-04" 5.11 31.77 97 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7468 1 415 6 whole rock conventional K-Ar 37 WR "4.962E-04, 0.581E-04, 1.1167E-04" 2.6 17.46 94 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7469 1 500 5 whole rock conventional K-Ar 38 WR "4.962E-04, 0.581E-04, 1.1167E-04" 4.07 33.76 98 -40 +80 MESH SIZE AGE TOO OLD 7470 1 334 4 biotite conventional K-Ar 39 B "4.962E-04, 0.581E-04, 1.1167E-04" 6.87 36.25 97 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7471 1 327 3 biotite conventional K-Ar 40 B "4.962E-04, 0.581E-04, 1.1167E-04" 9.28 47.79 98 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7472 1 411 4 whole rock conventional K-Ar 41 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.82 25.34 97 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7473 1 415 8 whole rock conventional K-Ar 42 WR "4.962E-04, 0.581E-04, 1.1167E-04" 3.34 22.38 96 -40 +80 MESH SIZE AGE PROBABLY A COOLING AGE 7474 1 45.94 0.9 biotite conventional K-Ar RLM-2-70 "4.76E-04, 0.589E-04, 1.18E-04*" 7.98 5.346 90 age of volcanism K=6.63% 7475 1 44.7 1 biotite conventional K-Ar RLM-7-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.61 5.61 70 K=7.15% AGE IS TOO YOUNG 7476 1 45.77 0.9 biotite conventional K-Ar RLM-2-69 "4.76E-04, 0.589E-04, 1.18E-04*" 8.13 5.426 86 age of volcanism K=6.75% 7477 1 42.88 1.3 biotite conventional K-Ar RLM-1-69 "4.76E-04, 0.589E-04, 1.18E-04*" 8.56 5.348 56 K=7.11% AGE IS TOO YOUNG. 7478 1 42.66 1 biotite conventional K-Ar RLM-8-70 "4.76E-04, 0.589E-04, 1.18E-04*" 7.64 4.748 80 age of volcanism K=6.32% 7479 1 37.94 1.1 biotite conventional K-Ar RLM-11-71 "4.76E-04, 0.589E-04, 1.18E-04*" 6.82 3.765 38 K=5.66% AGE IS TOO YOUNG 7479 2 35.72 0.9 biotite conventional K-Ar RLM-11-71 "4.76E-04, 0.589E-04, 1.18E-04*" 6.82 3.542 44 K=5.66% AGE IS TOO YOUNG 7480 1 24.62 0.8 biotite conventional K-Ar RLM-5-71 "4.76E-04, 0.589E-04, 1.18E-04*" 7.13 2.545 37 K=5.92% AGE IS TOO YOUNG 7481 1 46.86 0.7 biotite conventional K-Ar RLM-6-71 "4.76E-04, 0.589E-04, 1.18E-04*" 8.44 5.768 78 K=7.00% AGE IS TOO OLD 7481 2 47.02 0.7 biotite conventional K-Ar RLM-6-71 "4.76E-04, 0.589E-04, 1.18E-04*" 8.44 5.789 80 K=7.00% AGE IS TOO OLD. 7482 1 50.28 1.1 biotite conventional K-Ar RLM-1-70 "4.76E-04, 0.589E-04, 1.18E-04*" 9 6.607 82 age of volcanism K=7.47% 7483 1 49.93 1.2 biotite conventional K-Ar RLM-4-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.5 6.195 83 age of volcanism K=7.06% 7484 1 47.95 1.2 biotite conventional K-Ar RLM-5-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.33 5.827 79 age of volcanism K=6.92% 47.2 +-1.2 M.Y. IS BEST ESTIMATE OF THE AGE OF THE TUFF 7484 2 48.61 1.1 biotite conventional K-Ar RLM-5-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.33 5.909 82 age of volcanism K=6.92% 7484 3 47.21 2 biotite conventional K-Ar RLM-5-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.33 5.737 72 minimum age of volcanism K=6.92% 7485 1 38.27 0.9 biotite conventional K-Ar RLM-9-71 "4.76E-04, 0.589E-04, 1.18E-04*" 7.91 4.405 49 K=6.57% AGE IS TOO YOUNG 7486 1 74.22 2 biotite conventional K-Ar RLM-10-71 "4.76E-04, 0.589E-04, 1.18E-04*" 7.56 8.247 42 K=6.28% AGE IS MUCH TOO OLD. 7487 1 35.3 2.1 biotite conventional K-Ar RLM-6-70 "4.76E-04, 0.589E-04, 1.18E-04*" 6.89 3.536 30 K=5.72% AGE IS TOO YOUNG 7487 2 38.64 2.5 biotite conventional K-Ar RLM-6-70 "4.76E-04, 0.589E-04, 1.18E-04*" 6.89 3.874 52 K=5.72% AGE IS TOO YOUNG 7488 1 46.63 0.7 biotite conventional K-Ar RLM-1-71 "4.76E-04, 0.589E-04, 1.18E-04*" 8.32 5.658 80 age of volcanism K=6.91% 7489 1 49.51 1 biotite conventional K-Ar RLM-2-71 "4.76E-04, 0.589E-04, 1.18E-04*" 7.92 5.723 58 K=6.57% AGE IS TOO OLD. 7490 1 57.04 1 biotite conventional K-Ar RLM-8-71 "4.76E-04, 0.589E-04, 1.18E-04*" 7.55 6.299 67 K=6.27% AGE IS TOO OLD 7491 1 45.57 0.9 biotite conventional K-Ar RLM-9-70 "4.76E-04, 0.589E-04, 1.18E-04*" 7.95 5.282 86 K=6.60% AGE IS TOO OLD 7491 2 46.56 0.9 biotite conventional K-Ar RLM-9-70 "4.76E-04, 0.589E-04, 1.18E-04*" 7.95 5.399 87 K=6.60% AGE IS TOO OLD 7492 1 156.58 2.3 biotite conventional K-Ar RLM-3-71 "4.76E-04, 0.589E-04, 1.18E-04*" 8.37 19.711 97 K=6.95% SPURIOUS AGE 7492 2 155.71 2.3 biotite conventional K-Ar RLM-3-71 "4.76E-04, 0.589E-04, 1.18E-04*" 8.37 19.597 96 K=6.95% SPURIOUS AGE 7493 1 100.73 2.2 biotite conventional K-Ar RLM-3-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.26 12.32 84 K=6.86% SPURIOUS AGE 7493 2 103.79 2.3 biotite conventional K-Ar RLM-3-70 "4.76E-04, 0.589E-04, 1.18E-04*" 8.26 12.705 86 K=6.86% SPURIOUS AGE 7494 1 27.32 2.7 biotite conventional K-Ar RLM-7-71 "4.76E-04, 0.589E-04, 1.18E-04*" 5.62 2.227 14 K=4.67% AGE IS TOO YOUNG 7495 1 170 biotite conventional K-Ar KA 579 "4.72E-04, 0.584E-04, 1.19E-04" 6.599 70 age of intrusion REPLICATE K ANALYSES 7496 1 77.9 biotite conventional K-Ar KA 804 "4.72E-04, 0.584E-04, 1.19E-04" 6.824 60 age of intrusion REPLICATE K ANALYSES 7497 1 84.7 biotite conventional K-Ar KA 820 "4.72E-04, 0.584E-04, 1.19E-04" 8.03 86 age of intrusion REPLICATE K ANALYSES 7498 1 130 biotite conventional K-Ar KA 828 "4.72E-04, 0.584E-04, 1.19E-04" 7.11 90 minimum age of intrusion REPLICATE K ANALYSES 7499 1 143 hornblende conventional K-Ar KA 842 "4.72E-04, 0.584E-04, 1.19E-04" 0.13 18 REPLICATE K ANALYSES "AGE PROBABLY REDUCED BY DEEP BURIAL, ABNORMAL HEATING, AND/OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7500 1 162 biotite conventional K-Ar KA 902 "4.72E-04, 0.584E-04, 1.19E-04" 6.758 84 age of intrusion REPLICATE K ANALYSES 7501 1 143.5 biotite conventional K-Ar KA 955 "4.72E-04, 0.584E-04, 1.19E-04" 6.247 91 age of intrusion -28 +60 MESH SIZE REPLICATE K ANALYSES 7502 1 141 biotite conventional K-Ar KA 956 "4.72E-04, 0.584E-04, 1.19E-04" 7.848 96 age of intrusion -16 +28 MESH SIZE REPLICATE K ANALYSES 7503 1 128 biotite conventional K-Ar KA 1432 "4.72E-04, 0.584E-04, 1.19E-04" 9.166 94 "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7503 2 142 hornblende conventional K-Ar KA 1433 "4.72E-04, 0.584E-04, 1.19E-04" 0.778 83 age of intrusion "-10 +16 MESH, HAND-PICKED MATERIAL (REFERENCE ALSO DENOTES SAMPLE AS RUN KA 1432--COMPILER)." 7504 1 132 biotite conventional K-Ar KA 1436 "4.72E-04, 0.584E-04, 1.19E-04" 8.472 90 minimum age of intrusion "-16 +35 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7504 2 136 hornblende conventional K-Ar KA 1437 "4.72E-04, 0.584E-04, 1.19E-04" 0.663 50 age of intrusion "-28 +60 MESH, HAND-PICKED MATERIAL" 7505 1 126 biotite conventional K-Ar KA 1438 "4.72E-04, 0.584E-04, 1.19E-04" 8.839 93 minimum age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7505 2 131 hornblende conventional K-Ar KA 1439 "4.72E-04, 0.584E-04, 1.19E-04" 0.701 76 age of intrusion "-16 +28 MESH, HAND-PICKED MATERIAL" 7506 1 129 biotite conventional K-Ar KA 1440 "4.72E-04, 0.584E-04, 1.19E-04" 9.019 94 minimum age of intrusion "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7506 2 132 hornblende conventional K-Ar KA-1441 "4.72E-04, 0.584E-04, 1.19E-04" 0.695 76 age of intrusion "-16 +28 MESH, HAND-PICKED MATERIAL" 7507 1 143 hornblende conventional K-Ar KA 1442 "4.72E-04, 0.584E-04, 1.19E-04" 0.545 68 age of intrusion "-28 +48 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7507 2 142 hornblende conventional K-Ar KA 1449 "4.72E-04, 0.584E-04, 1.19E-04" 0.543 86 age of intrusion "-35 +48 MESH, HAND-PICKED MATERIAL" 7508 1 123 biotite conventional K-Ar KA 1501 "4.72E-04, 0.584E-04, 1.19E-04" 8.606 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7509 1 121 biotite conventional K-Ar KA 1502 "4.72E-04, 0.584E-04, 1.19E-04" 8.777 97 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7509 2 121 hornblende conventional K-Ar KA 1502-HBD "4.72E-04, 0.584E-04, 1.19E-04" 4.066 96 age of intrusion "-100 +200 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7510 1 97.4 biotite conventional K-Ar KA 1503 "4.72E-04, 0.584E-04, 1.19E-04" 9.318 92 minimum age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7511 1 101 biotite conventional K-Ar KA 1506 "4.72E-04, 0.584E-04, 1.19E-04" 8.306 86 age of intrusion "-60 +100 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYESE 7511 2 102 hornblende conventional K-Ar KA 1506-HBD "4.72E-04, 0.584E-04, 1.19E-04" 3.635 92 age of intrusion "-100 +150 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7512 1 86.8 biotite conventional K-Ar KA1508 "4.72E-04, 0.584E-04, 1.19E-04" 9.424 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7512 2 86.6 biotite conventional K-Ar KA 1508-R "4.72E-04, 0.584E-04, 1.19E-04" 9.424 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7512 3 88.9 biotite conventional K-Ar KA 1508-B "4.72E-04, 0.584E-04, 1.19E-04" 9.097 94 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7512 4 89 biotite conventional K-Ar KA 1508-B-R "4.72E-04, 0.584E-04, 1.19E-04" 9.097 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7513 1 105 biotite conventional K-Ar KA 1509 "4.72E-04, 0.584E-04, 1.19E-04" 9.006 96 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7513 2 105 hornblende conventional K-Ar KA 1509-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.81 93 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7514 1 99 biotite conventional K-Ar KA 1510 "4.72E-04, 0.584E-04, 1.19E-04" 7.004 44 minimum age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7515 1 97.2 biotite conventional K-Ar KA 1511 "4.72E-04, 0.584E-04, 1.19E-04" 8.963 91 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF LATER PLUTONISM. 7515 2 97.5 biotite conventional K-Ar KA 1511-10/16 "4.72E-04, 0.584E-04, 1.19E-04" 8.072 91 -10 +16 MESH SIZE REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF LATER PLUTONISM. 7515 3 98.5 biotite conventional K-Ar KA 1511-16/28 "4.72E-04, 0.584E-04, 1.19E-04" 7.442 92 -16 +28 MESH SIZE REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF LATER PLUTONISM. 7515 4 101.4 biotite conventional K-Ar KA 1511-35/48 "4.72E-04, 0.584E-04, 1.19E-04" 8.193 91 -35 +48 MESH SIZE REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF LATER PLUTONISM. 7515 5 100.9 biotite conventional K-Ar KA 1511-100/150 "4.72E-04, 0.584E-04, 1.19E-04" 8.547 92 -100 +150 MESH SIZE REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF LATER PLUTONISM 7516 1 124.6 hornblende conventional K-Ar KA 1511-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.056 85 age of intrusion "-35 +60 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7517 1 87.8 biotite conventional K-Ar KA 1514 "4.72E-04, 0.584E-04, 1.19E-04" 8.705 95 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES PREFERRED AGE IS 91 M.Y. 7517 2 91.4 hornblende conventional K-Ar KA 1514-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.012 73 age of intrusion "-28 +100 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7518 1 87.1 biotite conventional K-Ar KA 1518 "4.72E-04, 0.584E-04, 1.19E-04" 9.123 86 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7518 2 87.4 biotite conventional K-Ar KA 1518-R "4.72E-04, 0.584E-04, 1.19E-04" 9.123 85 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7519 1 88.7 biotite conventional K-Ar KA 1521 "4.72E-04, 0.584E-04, 1.19E-04" 9.06 96 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7520 1 89.4 biotite conventional K-Ar KA 1523 "4.72E-04, 0.584E-04, 1.19E-04" 9.197 94 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7521 1 81.8 biotite conventional K-Ar KA 1524 "4.72E-04, 0.584E-04, 1.19E-04" 8.02 93 age not evaluated "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7522 1 82.1 biotite conventional K-Ar KA 1525 "4.72E-04, 0.584E-04, 1.19E-04" 9.039 90 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7523 1 84.6 biotite conventional K-Ar KA 1528 "4.72E-04, 0.584E-04, 1.19E-04" 8.248 88 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7524 1 83.7 biotite conventional K-Ar KA 1530 "4.72E-04, 0.584E-04, 1.19E-04" 8.499 88 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7525 1 83.6 biotite conventional K-Ar KA 1531 "4.72E-04, 0.584E-04, 1.19E-04" 8.969 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7526 1 83.2 biotite conventional K-Ar KA 1532 "4.72E-04, 0.584E-04, 1.19E-04" 9.135 93 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7527 1 82.5 biotite conventional K-Ar KA 1533 "4.72E-04, 0.584E-04, 1.19E-04" 9.092 89 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7527 2 84.3 hornblende conventional K-Ar KA 1533-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.807 61 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7527 3 70.3 plagioclase conventional K-Ar KA 1533-PL "4.72E-04, 0.584E-04, 1.19E-04" 0.374 39 -60 +100 MESH SIZE; VERY FINE TWINNING IN SOME GRAINS; EXTENSIVE ALTERATION IN COARSE GRAINS; EXTENSIVE MYRMEKITE; HAND-PICKED MATERIAL AGE IS TOO YOUNG 7527 4 73.5 orthoclase conventional K-Ar KA 1533-KF "4.72E-04, 0.584E-04, 1.19E-04" 14.4 98 -28 +35 MESH SIZE; EXTENSIVELY CONVERTED TO MICROCLINE; HAND-PICKED MATERIAL AGE IS TOO YOUNG 7527 5 88.9 quartz conventional K-Ar KA 1533-QTZ "4.72E-04, 0.584E-04, 1.19E-04" 0.03 22 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" PREFERRED AGE IS 84 M.Y. 7528 1 82.1 biotite conventional K-Ar KA 1534 "4.72E-04, 0.584E-04, 1.19E-04" 7.558 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7529 1 84.3 biotite conventional K-Ar KA 1537 "4.72E-04, 0.584E-04, 1.19E-04" 8.733 93 age of intrusion -16 +28 MESH SIZE; HAND-PICKED MATERIAL 7530 1 83 biotite conventional K-Ar KA 1538 "4.72E-04, 0.584E-04, 1.19E-04" 9.147 95 age of intrusion "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" 7530 2 83.6 biotite conventional K-Ar KA 1538-R "4.72E-04, 0.584E-04, 1.19E-04" 9.147 92 age of intrusion "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" 7530 3 84.2 hornblende conventional K-Ar KA 1538-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.705 77 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7531 1 87 biotite conventional K-Ar KA 1539 "4.72E-04, 0.584E-04, 1.19E-04" 9.44 92 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7531 2 90.1 hornblende conventional K-Ar KA 1539-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.989 87 age of intrusion "-28 +35 MESH SIZE, HAND-PICKED MATERIAL" 7532 1 88.7 biotite conventional K-Ar KA 1540 "4.72E-04, 0.584E-04, 1.19E-04" 9.359 93 "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" LOW AGE PROBABLY DUE TO REHEATING BY LATER INTRUSIONS 7532 2 96.7 hornblende conventional K-Ar KA 1540-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.011 67 age of intrusion "-60 +100 MESH SIZE, HAND-PICKED MATERIAL" 7533 1 94.4 biotite conventional K-Ar KA 1541 "4.72E-04, 0.584E-04, 1.19E-04" 9.285 94 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7533 2 94 biotite conventional K-Ar KA 1541-R "4.72E-04, 0.584E-04, 1.19E-04" 9.285 93 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7533 3 97.8 hornblende conventional K-Ar KA 1541-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.887 86 age of intrusion "-26 +60 MESH SIZE, HAND-PICKED MATERIAL" 7533 4 90.7 plagioclase conventional K-Ar KA 1541-PL "4.72E-04, 0.584E-04, 1.19E-04" 0.281 58 -28 +60 MESH SIZE; MUCH MYRMEKITE; PRONOUNCED WAVY EXTINCTION; COARSE TWINNING; ZONED; HAND-PICKED MATERIAL. AGE IS APPARENTLY TOO YOUNG 7533 5 83.5 orthoclase conventional K-Ar KA 1541-KF "4.72E-04, 0.584E-04, 1.19E-04" 14.76 97 -28 +35 MESH SIZE; EXTENSIVE MICROCLINE TWINNING; HAND-PICKED MATERIAL AGE IS TOO YOUNG 7534 1 108.3 quartz conventional K-Ar KA 1541-QTZ "4.72E-04, 0.584E-04, 1.19E-04" 0.023 8 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" AGE IS APPARENTLY TOO OLD; PREFERRED AGE IS 98 M.Y. 7535 1 84.8 biotite conventional K-Ar KA 1542 "4.72E-04, 0.584E-04, 1.19E-04" 9.294 93 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7536 1 82.9 biotite conventional K-Ar KA 1543 "4.72E-04, 0.584E-04, 1.19E-04" 9.25 94 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7537 1 82.7 biotite conventional K-Ar KA 1545 "4.72E-04, 0.584E-04, 1.19E-04" 8.88 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7538 1 84.2 biotite conventional K-Ar KA 1546 "4.72E-04, 0.584E-04, 1.19E-04" 8.833 95 age of intrusion "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" 7539 1 85.6 biotite conventional K-Ar KA 1547 "4.72E-04, 0.584E-04, 1.19E-04" 8.853 96 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7540 1 81.5 biotite conventional K-Ar KA 1548 "4.72E-04, 0.584E-04, 1.19E-04" 8.428 91 age of intrusion "-35 +48 MESH SIZE, HAND-PICKED MATERIAL" 7540 2 81.8 biotite conventional K-Ar KA 1548-R "4.72E-04, 0.584E-04, 1.19E-04" 8.428 94 age of intrusion "-35 +48 MESH SIZE, HAND-PICKED MATERIAL" 7541 1 81.1 biotite conventional K-Ar KA 1549 "4.72E-04, 0.584E-04, 1.19E-04" 8.558 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7542 1 79.1 biotite conventional K-Ar KA 1551 "4.72E-04, 0.584E-04, 1.19E-04" 8.446 94 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7543 1 78.1 biotite conventional K-Ar KA 1552 "4.72E-04, 0.584E-04, 1.19E-04" 8.184 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7544 1 80.1 biotite conventional K-Ar KA 1554 "4.72E-04, 0.584E-04, 1.19E-04" 8.69 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7545 1 80.1 biotite conventional K-Ar KA 1555 "4.72E-04, 0.584E-04, 1.19E-04" 8.516 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7546 1 82.1 biotite conventional K-Ar KA 1556 "4.72E-04, 0.584E-04, 1.19E-04" 8.978 89 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7547 1 89.7 biotite conventional K-Ar KA 1563 "4.72E-04, 0.584E-04, 1.19E-04" 9.021 93 age of intrusion "-28 +35 MESH SIZE, HAND-PICKED MATERIAL" 7548 1 88.5 biotite conventional K-Ar KA 1564 "4.72E-04, 0.584E-04, 1.19E-04" 9.071 84 "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7548 2 95.6 hornblende conventional K-Ar KA 1564-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.289 89 minimum age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7548 3 72.6 plagioclase conventional K-Ar KA 1564-PL "4.72E-04, 0.584E-04, 1.19E-04" 0.334 51 -28 +60 MESH SIZE; STRONG ZONING; EN ECHELON SHEARING; HAND-PICKED MATERIAL AGE TOO YOUNG. 7548 4 87.5 orthoclase conventional K-Ar KA 1564-KF "4.72E-04, 0.584E-04, 1.19E-04" 14.09 98 -35 +48 MESH SIZE; MINIMUM WAVY EXTINCTION; HAND-PICKED MATERIAL AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7548 5 57.9 quartz conventional K-Ar KA 1564-QTZ "4.72E-04, 0.584E-04, 1.19E-04" 0.017 8 -28 +60 MESH SIZE; HAND-PICKED MATERIAL AGE TOO YOUNG 7549 1 87.7 biotite conventional K-Ar KA 1565 "4.72E-04, 0.584E-04, 1.19E-04" 9.004 94 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7550 1 87.8 biotite conventional K-Ar KA 1566 "4.72E-04, 0.584E-04, 1.19E-04" 9.18 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7550 2 88.2 biotite conventional K-Ar KA 1566-R "4.72E-04, 0.584E-04, 1.19E-04" 9.18 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7550 3 88.7 biotite conventional K-Ar KA 1566-B "4.72E-04, 0.584E-04, 1.19E-04" 9.095 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7550 4 88.2 biotite conventional K-Ar KA 1566-B-R "4.72E-04, 0.584E-04, 1.19E-04" 9.095 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7551 1 102.3 biotite conventional K-Ar KA 1569 "4.72E-04, 0.584E-04, 1.19E-04" 9.605 95 minimum age of intrusion -10 +16 MESH SIZE; SLIGHT ALTERATION; HAND-PICKED MATERIAL 7551 2 107.5 hornblende conventional K-Ar KA 1569-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.711 76 age of intrusion -28 +60 MESH SIZE; SLIGHT ALTERATION; HAND-PICKED MATERIAL 7551 3 102.4 plagioclase conventional K-Ar KA 1569-PL "4.72E-04, 0.584E-04, 1.19E-04" 0.933 80 minimum age of intrusion -60 +100 MESH SIZE; BIG BROAD TWINS; ALTERATION LOCALLY STRONG INTERNALLY AND ON BOUNDARIES; HAND-PICKED MATERIAL 7551 4 100.1 orthoclase conventional K-Ar KA 1569-KF "4.72E-04, 0.584E-04, 1.19E-04" 11.15 94 minimum age of intrusion -28 +60 MESH SIZE; VERY MILD STRAIN; HAND-PICKED MATERIAL 7551 5 58.1 quartz conventional K-Ar KA 1569-QTZ "4.72E-04, 0.584E-04, 1.19E-04" 0.049 9 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" RELATIVELY HIGH K20 VALUE MAY INDICATE LACK OF REMOVAL OF ALL ALTERED PLAGIOCLASE FROM THE FINAL CONCENTRATE AGE IS TOO YOUNG. 7552 1 98 biotite conventional K-Ar KA 1570 "4.72E-04, 0.584E-04, 1.19E-04" 9.434 91 age of intrusion "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" 7552 2 102 hornblende conventional K-Ar KA 1570-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.594 82 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7553 1 98.2 biotite conventional K-Ar KA 1571 "4.72E-04, 0.584E-04, 1.19E-04" 9.07 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7554 1 92.3 biotite conventional K-Ar KA 1572 "4.72E-04, 0.584E-04, 1.19E-04" 9.105 90 "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7555 1 90.6 biotite conventional K-Ar KA 1573 "4.72E-04, 0.584E-04, 1.19E-04" 9.227 89 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7556 1 87.7 biotite conventional K-Ar KA 1574 "4.72E-04, 0.584E-04, 1.19E-04" 8.764 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7557 1 85.5 biotite conventional K-Ar KA 1575 "4.72E-04, 0.584E-04, 1.19E-04" 8.588 85 age of intrusion "-16 +28 MESH SIZE, HAND-PICKEDMATERIAL" 7557 2 87.7 hornblende conventional K-Ar KA 1575-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.285 88 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7558 1 87 biotite conventional K-Ar KA 1576 "4.72E-04, 0.584E-04, 1.19E-04" 8.907 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7559 1 85.1 biotite conventional K-Ar KA 1577 "4.72E-04, 0.584E-04, 1.19E-04" 8.486 87 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7560 1 79.2 biotite conventional K-Ar KA 1578 "4.72E-04, 0.584E-04, 1.19E-04" 9.269 90 minimum age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7561 1 78.7 biotite conventional K-Ar KA 1579 "4.72E-04, 0.584E-04, 1.19E-04" 8.839 91 minimum age of intrusion "-35 +48 MESH SIZE, HAND-PICKED MATERIAL" 7562 1 78.2 biotite conventional K-Ar KA 1580 "4.72E-04, 0.584E-04, 1.19E-04" 8.909 87 minimum age of intrusion "-48 +60 MESH SIZE, HAND-PICKED MATERIAL" 7563 1 66.1 biotite conventional K-Ar KA 1581 "4.72E-04, 0.584E-04, 1.19E-04" 8.295 80 "-35 +48 MESH SIZE, HAND-PICKED MATERIAL" AGE APPEARS TOO YOUNG 7564 1 74 biotite conventional K-Ar KA 1582 "4.72E-04, 0.584E-04, 1.19E-04" 9.182 79 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7564 2 86.2 hornblende conventional K-Ar KA 1582-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.091 83 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7565 1 81.8 biotite conventional K-Ar KA 1583 "4.72E-04, 0.584E-04, 1.19E-04" 9.138 87 age of intrusion 7566 1 79.1 biotite conventional K-Ar KA 1584 "4.72E-04, 0.584E-04, 1.19E-04" 8.884 89 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7566 2 80 hornblende conventional K-Ar KA 1584-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.747 63 age of intrusion "-60 +150 MESH SIZE, HAND-PICKED MATERIAL" 7567 1 79.8 biotite conventional K-Ar KA 1585 "4.72E-04, 0.584E-04, 1.19E-04" 8.492 94 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7568 1 80.5 biotite conventional K-Ar KA 1586 "4.72E-04, 0.584E-04, 1.19E-04" 9.197 90 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7569 1 78.4 biotite conventional K-Ar KA 1587 "4.72E-04, 0.584E-04, 1.19E-04" 9.186 96 minimum age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7569 2 78.4 biotite conventional K-Ar KA 1587-R "4.72E-04, 0.584E-04, 1.19E-04" 9.186 90 minimum age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7569 3 84 hornblende conventional K-Ar KA 1587-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.612 86 age of intrusion "-60 +100 MESH SIZE, HAND-PICKED MATERIAL" 7570 1 80.1 BIOTITE conventional K-Ar KA 1592 "4.72E-04, 0.584E-04, 1.19E-04" 9.309 92 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7570 2 81.5 hornblende conventional K-Ar KA 1592-HBD "4.72E-04, 0.584E-04, 1.19E-04" 80 age of intrusion 7571 1 82.4 biotite conventional K-Ar KA 1594 "4.72E-04, 0.584E-04, 1.19E-04" 8.58 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7572 1 80.1 biotite conventional K-Ar KA 1598 "4.72E-04, 0.584E-04, 1.19E-04" 9.156 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7573 1 81.4 biotite conventional K-Ar KA 1599 "4.72E-04, 0.584E-04, 1.19E-04" 8.686 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7574 1 91.7 biotite conventional K-Ar KA 1602 "4.72E-04, 0.584E-04, 1.19E-04" 9.189 94 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7575 1 92.6 biotite conventional K-Ar KA 1603 "4.72E-04, 0.584E-04, 1.19E-04" 9.298 92 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7576 1 82.7 biotite conventional K-Ar KA 1604 "4.72E-04, 0.584E-04, 1.19E-04" 8.668 75 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7577 1 87.4 biotite conventional K-Ar KA 1605 "4.72E-04, 0.584E-04, 1.19E-04" 9.075 85 age of intrusion -10 +16 MESH SIZE; SLIGHT ALTERATION; HAND-PICKED MATERIAL 7577 2 90.1 hornblende conventional K-Ar KA 1605-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.07 80 age of intrusion -28 +60 MESH SIZE; SLIGHT ALTERATION; HAND-PICKED MATERIAL 7577 3 88.1 plagioclase conventional K-Ar KA 1605-PL "4.72E-04, 0.584E-04, 1.19E-04" 0.306 69 age of intrusion -60 +100 MESH SIZE; STRONGLY ZONED; ALTERATION SLIGHT; HAND-PICKED MATERIAL 7577 4 87 orthoclase conventional K-Ar KA 1605-KF "4.72E-04, 0.584E-04, 1.19E-04" 14.06 98 age of intrusion -28 +60 MESH SIZE; INCIPIENT MICROCLINIZATION; HAND-PICKED MATERIAL 7578 1 88.5 biotite conventional K-Ar KA 1606 "4.72E-04, 0.584E-04, 1.19E-04" 8.723 81 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7579 1 88.9 biotite conventional K-Ar KA 1607 "4.72E-04, 0.584E-04, 1.19E-04" 9.081 74 age of intrusion "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" 7580 1 90.5 biotite conventional K-Ar KA 1608 "4.72E-04, 0.584E-04, 1.19E-04" 8.554 85 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7580 2 93.2 biotite conventional K-Ar KA 1608-R "4.72E-04, 0.584E-04, 1.19E-04" 8.554 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7581 1 87.4 biotite conventional K-Ar KA 1609 "4.72E-04, 0.584E-04, 1.19E-04" 8.784 87 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" DISCORDANCE BETWEEN BIOTITE AND HORNBLENDE OF THIS SAMPLE POSSIBLY DUE TO DEPTH OF EMPLACEMENT AND/OR EROSION 7581 2 93 hornblende conventional K-Ar KA 1609-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.174 83 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7582 1 88.3 biotite conventional K-Ar KA 1610 "4.72E-04, 0.584E-04, 1.19E-04" 8.161 81 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7582 2 86.4 hornblende conventional K-Ar KA 1610-HBD "4.72E-04, 0.584E-04, 1.19E-04" 2.574 86 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7583 1 81.2 biotite conventional K-Ar KA 1621 "4.72E-04, 0.584E-04, 1.19E-04" 8.763 81 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7584 1 138 biotite conventional K-Ar KA 1624 "4.72E-04, 0.584E-04, 1.19E-04" 9.311 94 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7584 2 136 hornblende conventional K-Ar KA 1624-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.876 89 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7585 1 93.5 biotite conventional K-Ar KA 1626 "4.72E-04, 0.584E-04, 1.19E-04" 9.313 83 "-8 +10 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7585 2 101 hornblende conventional K-Ar KA 1626-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.743 75 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7586 1 97.7 biotite conventional K-Ar KA 1627 "4.72E-04, 0.584E-04, 1.19E-04" 9.271 92 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7586 2 100 hornblende conventional K-Ar KA 1627-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.757 70 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7587 1 104 biotite conventional K-Ar KA 1628 "4.72E-04, 0.584E-04, 1.19E-04" 9.36 86 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7587 2 144 hornblende conventional K-Ar KA 1628-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.869 82 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7588 1 103 biotite conventional K-Ar KA 1629 "4.72E-04, 0.584E-04, 1.19E-04" 9.115 92 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7588 2 105 hornblende conventional K-Ar KA 1629-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.549 74 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7589 1 86.1 biotite conventional K-Ar KA 1631 "4.72E-04, 0.584E-04, 1.19E-04" 8.856 79 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7590 1 152 biotite conventional K-Ar KA 1632 "4.72E-04, 0.584E-04, 1.19E-04" 8.96 90 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7590 2 162 hornblende conventional K-Ar KA 1632-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.151 74 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7591 1 144 biotite conventional K-Ar KA 1634 "4.72E-04, 0.584E-04, 1.19E-04" 9.354 95 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7591 2 156 hornblende conventional K-Ar KA 1634-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.229 90 minimum age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7592 1 125 biotite conventional K-Ar KA 1635 "4.72E-04, 0.584E-04, 1.19E-04" 9.413 80 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7592 2 148 hornblende conventional K-Ar KA 1635-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.648 96 age of intrusion "-28 +100 MESH SIZE, HAND-PICKED MATERIAL" 7593 1 96 biotite conventional K-Ar KA 1636 "4.72E-04, 0.584E-04, 1.19E-04" 9.08 89 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7594 1 95.8 hornblende conventional K-Ar KA 1662-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.152 81 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7595 1 101 hornblende conventional K-Ar KA 1663-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.21 89 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7596 1 145 biotite conventional K-Ar KA 1664 "4.72E-04, 0.584E-04, 1.19E-04" 8.815 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7596 2 148 hornblende conventional K-Ar KA 1664-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.859 89 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7597 1 108 hornblende conventional K-Ar KA 1665-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.944 91 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7598 1 107 biotite conventional K-Ar KA 1666 "4.72E-04, 0.584E-04, 1.19E-04" 9.289 95 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7599 1 80.4 biotite conventional K-Ar KA 1667 "4.72E-04, 0.584E-04, 1.19E-04" 8.684 87 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7599 2 81.4 hornblende conventional K-Ar KA 1667-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.128 83 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7600 1 70.6 hornblende conventional K-Ar KA 1668-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.295 84 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7601 1 69.7 hornblende conventional K-Ar KA 1670-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.462 95 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7602 1 76.9 hornblende conventional K-Ar KA 1671-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.005 90 "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7603 1 67.2 biotite conventional K-Ar KA 1672 "4.72E-04, 0.584E-04, 1.19E-04" 9.213 86 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7603 2 69.5 hornblende conventional K-Ar KA 1672-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.288 89 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7604 1 68.1 biotite conventional K-Ar KA 1674 "4.72E-04, 0.584E-04, 1.19E-04" 8.831 87 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7604 2 73.1 hornblende conventional K-Ar KA 1674-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.239 71 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7605 1 64.7 biotite conventional K-Ar KA 1675 "4.72E-04, 0.584E-04, 1.19E-04" 9.038 87 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7606 1 66.1 biotite conventional K-Ar KA 1676 "4.72E-04, 0.584E-04, 1.19E-04" 9.019 95 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7607 1 69.7 biotite conventional K-Ar KA 1677 "4.72E-04, 0.584E-04, 1.19E-04" 9.127 95 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7607 2 72.6 hornblende conventional K-Ar KA 1677-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.044 91 "-60 +28 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7608 1 92.8 biotite conventional K-Ar KA 1678 "4.72E-04, 0.584E-04, 1.19E-04" 8.998 87 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7608 2 97.6 hornblende conventional K-Ar KA 1678-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.805 91 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7609 1 93.7 biotite conventional K-Ar KA 1679 "4.72E-04, 0.584E-04, 1.19E-04" 9.056 94 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7610 1 77.4 hornblende conventional K-Ar KA 1682-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.39 57 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7611 1 102 biotite conventional K-Ar KA 1683 "4.72E-04, 0.584E-04, 1.19E-04" 9.142 97 minimum age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7611 2 100 hornblende conventional K-Ar KA 1683-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.719 92 minimum age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7612 1 65.8 biotite conventional K-Ar KA 1696 "4.72E-04, 0.584E-04, 1.19E-04" 9.098 88 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7612 2 70 hornblende conventional K-Ar KA 1696-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.041 90 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" "AGE REFLECTS DEEP BURIAL, ABNORMAL HEATING, OR ABNORMAL STRAIN PRIOR TO PRESENT EXPOSURE" 7613 1 119 biotite conventional K-Ar KA 1697 "4.72E-04, 0.584E-04, 1.19E-04" 8.78 97 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7614 1 108 biotite conventional K-Ar KA 1698 "4.72E-04, 0.584E-04, 1.19E-04" 9.083 94 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF LATER PLUTONISM 7614 2 140 hornblende conventional K-Ar KA 1698-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.934 94 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7615 1 117 biotite conventional K-Ar KA 1699 "4.72E-04, 0.584E-04, 1.19E-04" 9.489 84 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7615 2 140 hornblende conventional K-Ar KA 1699-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.859 96 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7616 1 138 hornblende conventional K-Ar KA 1700-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.564 72 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7617 1 143 biotite conventional K-Ar KA 1701 "4.72E-04, 0.584E-04, 1.19E-04" 9.445 96 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7617 2 146 hornblende conventional K-Ar KA 1701-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.694 75 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7618 1 93.3 biotite conventional K-Ar KA 67-64 "4.72E-04, 0.584E-04, 1.19E-04" 8.688 91 minimum age of intrusion REPLICATE K ANALYESE AGE PROBABLY REDUCED BY REHEATING DURING LATER INTRUSIONS 7618 2 91 biotite conventional K-Ar 67 "4.72E-04, 0.584E-04, 1.19E-04" 8.54 87 7619 1 92.9 biotite conventional K-Ar KA 71-64 "4.72E-04, 0.584E-04, 1.19E-04" 9.057 91 minimum age of intrusion REPLICATE K ANALYSES AGE PROBABLY REDUCED BY REHEATING DURING LATER INTRUSIONS 7619 2 88.5 biotite conventional K-Ar 71 "4.72E-04, 0.584E-04, 1.19E-04" 9.1 93 7620 1 90 biotite conventional K-Ar KA 72-64 "4.72E-04, 0.584E-04, 1.19E-04" 9.075 89 minimum age of intrusion -16 +35 MESH SIZE REPLICATE K ANALYSES AGE PROBABLY REDUCED BY REHEATING DURING LATER INTRUSIONS 7620 2 87.8 biotite conventional K-Ar 72 "4.72E-04, 0.584E-04, 1.19E-04" 9.14 83 7621 1 81.9 biotite conventional K-Ar KA 131-64 "4.72E-04, 0.584E-04, 1.19E-04" 9.289 89 age of intrusion HAND-PICKED MATERIAL REPLICATE K ANALYSES 7622 1 83.7 biotite conventional K-Ar DKA 1028 "4.72E-04, 0.584E-04, 1.19E-04" 9.031 92 -60 +80 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7623 1 84.8 biotite conventional K-Ar DKA 1029 "4.72E-04, 0.584E-04, 1.19E-04" 8.931 90 -80 +100 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7624 1 94.8 hornblende conventional K-Ar MKA 409 "4.72E-04, 0.584E-04, 1.19E-04" 0.936 71 -100 +150 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7625 1 93.9 biotite conventional K-Ar MKA 41 "4.72E-04, 0.584E-04, 1.19E-04" 7.29 89 -80 +100 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7626 1 83.2 biotite conventional K-Ar DKA 1031 "4.72E-04, 0.584E-04, 1.19E-04" 9.071 94 -80 +100 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7627 1 92.8 hornblende conventional K-Ar DKA 1032 "4.72E-04, 0.584E-04, 1.19E-04" 0.787 78 -100 +150 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7628 1 99 biotite conventional K-Ar DKA 1030 "4.72E-04, 0.584E-04, 1.19E-04" 9.241 90 -80 +100 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7629 1 206 hornblende conventional K-Ar MKA 410 "4.72E-04, 0.584E-04, 1.19E-04" 0.537 78 age of intrusion -100 +150 MESH SIZE 7630 1 82 biotite conventional K-Ar BKA 558 "4.72E-04, 0.584E-04, 1.19E-04" 7.531 67 -60 +80 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7631 1 89.6 biotite conventional K-Ar MKA 42 "4.72E-04, 0.584E-04, 1.19E-04" 8.387 91 -40 +60 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7632 1 87.7 biotite conventional K-Ar BKA 488 "4.72E-04, 0.584E-04, 1.19E-04" 9.001 88 age of intrusion -80 +100 MESH SIZE 7633 1 85.5 hornblende conventional K-Ar 61-192 "4.72E-04, 0.584E-04, 1.19E-04" 0.454 85 age of intrusion -100 +150 MESH SIZE 7634 1 87.9 biotite conventional K-Ar BKA 487 "4.72E-04, 0.584E-04, 1.19E-04" 8.977 79 -40 +60 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7635 1 97.1 hornblende conventional K-Ar MKA 458 "4.72E-04, 0.584E-04, 1.19E-04" 0.775 57 -100 +115 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7636 1 69 biotite conventional K-Ar BKA 557 "4.72E-04, 0.584E-04, 1.19E-04" 7.519 78 -60 +80 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7637 1 80.3 biotite conventional K-Ar 61-001 "4.72E-04, 0.584E-04, 1.19E-04" 8.845 91 age of intrusion -60 +80 MESH SIZE 7638 1 83.3 hornblende conventional K-Ar 61-020 "4.72E-04, 0.584E-04, 1.19E-04" 0.731 88 age of intrusion -80 +100 MESH SIZE 7639 1 134 biotite conventional K-Ar MKA 51 "4.72E-04, 0.584E-04, 1.19E-04" 4.097 79 -60 +80 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER INTRUSIONS 7640 1 177.6 hornblende conventional K-Ar 61-045 "4.72E-04, 0.584E-04, 1.19E-04" 0.587 83 age of intrusion -100 +115 MESH SIZE 7641 1 149.2 biotite conventional K-Ar 61-019 "4.72E-04, 0.584E-04, 1.19E-04" 8.507 91 -60 +80 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7642 1 157.5 hornblende conventional K-Ar 61-025 "4.72E-04, 0.584E-04, 1.19E-04" 0.897 94 minimum age of intrusion -100 +115 MESH SIZE 7643 1 153.5 biotite conventional K-Ar 51-166 "4.72E-04, 0.584E-04, 1.19E-04" 8.447 91 age not evaluated -60 +80 MESH SIZE (SAMPLE NO. SHOULD PROBABLY BE 61-166--COMPLIER) 7644 1 139.4 biotite conventional K-Ar 61-003 "4.72E-04, 0.584E-04, 1.19E-04" 7.796 64 -60 +80 MESH SIZE AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7645 1 195 hornblende conventional K-Ar 61-017 "4.72E-04, 0.584E-04, 1.19E-04" 1.08 94 age of intrusion -100 +115 MESH SIZE 7646 1 210.2 biotite conventional K-Ar 61-008 "4.72E-04, 0.584E-04, 1.19E-04" 8.23 96 age of intrusion -60 +80 MESH SIZE 7647 1 206.2 hornblende conventional K-Ar 61-026 "4.72E-04, 0.584E-04, 1.19E-04" 1.08 95 age of intrusion -100 +115 MESH SIZE 7648 1 85.9 biotite conventional K-Ar 71-077 "4.72E-04, 0.584E-04, 1.19E-04" 9.423 87 age of intrusion -60 +80 MESH SIZE 7649 1 87.7 hornblende conventional K-Ar 71-065 "4.72E-04, 0.584E-04, 1.19E-04" 1.071 52 age of intrusion -100 +150 MESH SIZE 7650 1 104.9 hornblende conventional K-Ar 71-069 "4.72E-04, 0.584E-04, 1.19E-04" 0.809 44 age of intrusion -100 +115 MESH SIZE 7651 1 92 hornblende conventional K-Ar MKA 399 "4.72E-04, 0.584E-04, 1.19E-04" 1000 87 age not evaluated -100 +115 MESH SIZE "THIS AGE ALSO REPORTED BY MARVIN (1968); MARVIN AND DOBSON (1979, P. 8, ENTRY 39) REPORTED AN AGE OF 96 M.Y. (RECALCULATED) FOR THIS SAMPLE." 7652 1 155.5 hornblende conventional K-Ar 61-047 "4.72E-04, 0.584E-04, 1.19E-04" 0.722 88 minimum age of intrusion -100 +115 MESH SIZE 7653 1 163.1 hornblende conventional K-Ar 61-043 "4.72E-04, 0.584E-04, 1.19E-04" 0.685 85 age of intrusion -80 +100 MESH SIZE 7654 1 156.7 biotite conventional K-Ar 61-005 "4.72E-04, 0.584E-04, 1.19E-04" 8.385 94 minimum age of intrusion 7655 1 130 biotite conventional K-Ar KA 957 "4.72E-04, 0.584E-04, 1.19E-04" 7.669 94 minimum age of intrusion -16 +28 MESH SIZE REPLICATE K ANALYSES (REFERENCE ALSO REPORTS AGE AS 131 M.Y.--COMPLIER) 7656 1 99.9 biotite conventional K-Ar KA 1504 "4.72E-04, 0.584E-04, 1.19E-04" 8.799 93 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7657 1 96.7 biotite conventional K-Ar KA 1512 "4.72E-04, 0.584E-04, 1.19E-04" 8.952 89 age of intrusion -10 +16 MESH SIZE; EXTENSIVELY CHLORITIZED (PICKED CONCENTRATES USED FOR ANALYSIS) REPLICATE K ANALYSES 7657 2 97.8 hornblende conventional K-Ar KA 1512-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.803 73 age of intrusion -28 +60 MESH SIZE; EXTENSIVELY CHLORITIZED (PICKED CONCENTRATES USED FOR ANALYSIS) REPLICATE K ANALYSES 7657 3 92.5 plagioclase conventional K-Ar KA 1512-PL "4.72E-04, 0.584E-04, 1.19E-04" 0.358 65 -28 +60 MESH SIZE; TWINNING THIN AND CLOSE; ALTERATION THROUGHOUT GRAINS; HAND-PICKED MATERIAL REPLICATE K ANALYSES PREFERRED AGE IS 98 M.Y. 7657 4 100.1 orthoclase conventional K-Ar KA 1512-KF "4.72E-04, 0.584E-04, 1.19E-04" 13.91 97 -60 +100 MESH SIZE; INCIPIENT MICROCLINE AND LOW WAVY EXTINCTION; HAND-PICKED MATERIAL REPLICATE K ANALYSES PREFERRED AGE IS 98 M.Y. 7657 5 109.4 quartz conventional K-Ar KA 1512-QTZ "4.72E-04, 0.584E-04, 1.19E-04" 0.0336 16 "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES PREFERRED AGE IS 98 M.Y. 7658 1 91.7 biotite conventional K-Ar KA 1519 "4.72E-04, 0.584E-04, 1.19E-04" 8.971 90 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 7658 2 99.6 hornblende conventional K-Ar KA 1519-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.992 90 age of intrusion "-60 +100 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7659 1 94.3 biotite conventional K-Ar KA 1520 "4.72E-04, 0.584E-04, 1.19E-04" 9.327 96 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" REPLICATE K ANALYSES 7660 1 82.4 biotite conventional K-Ar KA 1526 "4.72E-04, 0.584E-04, 1.19E-04" 9.372 92 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7660 2 83.7 biotite conventional K-Ar KA 1526-R "4.72E-04, 0.584E-04, 1.19E-04" 9.372 93 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7661 1 81.9 biotite conventional K-Ar KA 1527 "4.72E-04, 0.584E-04, 1.19E-04" 9.16 85 age of intrusion -10 +16 MESH SIZE; HIGH CHLORITE CONTENT; HAND-PICKED MATERIAL 7661 2 80.2 biotite conventional K-Ar KA 1527-8/10 "4.72E-04, 0.584E-04, 1.19E-04" 8.815 90 age of intrusion -8 +10 MESH SIZE; HIGH CHLORITE CONTENT 7661 3 80 biotite conventional K-Ar KA 1527-10/16 "4.72E-04, 0.584E-04, 1.19E-04" 8.635 93 age of intrusion -10 +16 MESH SIZE; HIGH CHLORITE CONTENT 7661 4 82 biotite conventional K-Ar KA 1527-16/28 "4.72E-04, 0.584E-04, 1.19E-04" 8.29 92 age of intrusion -16 +28 MESH SIZE; HIGH CHLORITE CONTENT 7661 5 85.7 biotite conventional K-Ar KA 1527-35/48 "4.72E-04, 0.584E-04, 1.19E-04" 5.235 92 age not evaluated -35 +48 MESH SIZE; HIGH CHLORITE CONTENT 7662 1 86.9 biotite conventional K-Ar KA 1527-48/60 "4.72E-04, 0.584E-04, 1.19E-04" 3.821 90 age not evaluated -48 +60 MESH SIZE; HIGH CHLORITE CONTENT 7662 2 84.7 biotite conventional K-Ar KA 1527-60/100 "4.72E-04, 0.584E-04, 1.19E-04" 3.404 88 age not evaluated -60 +100 MESH SIZE; HIGH CHLORITE CONTENT 7662 3 90.8 biotite conventional K-Ar KA 1527-100/150 "4.72E-04, 0.584E-04, 1.19E-04" 1.964 71 maximum age of intrusion -100 +150 MESH SIZE; HIGH CHLORITE CONTENT 7663 1 82.8 biotite conventional K-Ar KA 1535 "4.72E-04, 0.584E-04, 1.19E-04" 8.97 88 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7664 1 81.7 biotite conventional K-Ar KA 1536 "4.72E-04, 0.584E-04, 1.19E-04" 8.78 93 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7665 1 79.5 biotite conventional K-Ar KA 1550 "4.72E-04, 0.584E-04, 1.19E-04" 8.052 91 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7666 1 78.8 biotite conventional K-Ar KA 1553 "4.72E-04, 0.584E-04, 1.19E-04" 8.606 85 age of intrusion "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" 7666 2 77.4 hornblende conventional K-Ar KA 1553-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.866 58 age of intrusion "-60 +100 MESH SIZE, HAND-PICKED MATERIAL" 7667 1 78.7 biotite conventional K-Ar KA 1559 "4.72E-04, 0.584E-04, 1.19E-04" 9.183 88 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7668 1 77.4 biotite conventional K-Ar KA 1560 "4.72E-04, 0.584E-04, 1.19E-04" 9.607 88 age of intrusion "-28 +35 MESH SIZE, HAND-PICKED MATERIAL" 7669 1 79.6 biotite conventional K-Ar KA 1561 "4.72E-04, 0.584E-04, 1.19E-04" 8.248 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7670 1 81.8 biotite conventional K-Ar KA 1588 "4.72E-04, 0.584E-04, 1.19E-04" 8.368 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7671 1 79.6 biotite conventional K-Ar KA 1589 "4.72E-04, 0.584E-04, 1.19E-04" 8.64 84 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7672 1 81.9 biotite conventional K-Ar KA 1590 "4.72E-04, 0.584E-04, 1.19E-04" 8.906 89 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7672 2 81.5 biotite conventional K-Ar KA 1590-R "4.72E-04, 0.584E-04, 1.19E-04" 8.906 84 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7673 1 79.3 biotite conventional K-Ar KA 1591 "4.72E-04, 0.584E-04, 1.19E-04" 8.353 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7674 1 83.4 biotite conventional K-Ar KA 1593 "4.72E-04, 0.584E-04, 1.19E-04" 8.556 93 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7675 1 81 biotite conventional K-Ar KA 1595 "4.72E-04, 0.584E-04, 1.19E-04" 8.792 90 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7676 1 81.4 biotite conventional K-Ar KA 1596 "4.72E-04, 0.584E-04, 1.19E-04" 8.41 91 age of intrusion "-28 +48 MESH SIZE, HAND-PICKED MATERIAL" 7677 1 80.2 biotite conventional K-Ar KA 1597 "4.72E-04, 0.584E-04, 1.19E-04" 8.959 95 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7678 1 83.8 biotite conventional K-Ar KA 1600 "4.72E-04, 0.584E-04, 1.19E-04" 7.787 89 age of intrusion "-28 +35 MESH SIZE, HAND-PICKED MATERIAL" 7679 1 82.5 biotite conventional K-Ar KA 1601 "4.72E-04, 0.584E-04, 1.19E-04" 8.768 91 "-10 +16 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY RECESS PLUTON 7679 2 88.4 hornblende conventional K-Ar KA 1601-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.928 88 age of intrusion "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7680 1 76.9 biotite conventional K-Ar KA 1673 "4.72E-04, 0.584E-04, 1.19E-04" 8.909 95 age not evaluated "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7681 1 61 biotite conventional K-Ar KA 1680 "4.72E-04, 0.584E-04, 1.19E-04" 7.926 91 age not evaluated "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7681 2 71.5 hornblende conventional K-Ar KA 1680-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.274 58 age not evaluated "-28 +60 MESH SIZE, HAND-PICKED MATERIAL" 7682 1 82.4 biotite conventional K-Ar BKA 556 "4.72E-04, 0.584E-04, 1.19E-04" 8.218 88 age of intrusion -60 +80 MESH SIZE 7683 1 48.8 biotite conventional K-Ar KA 822 "4.72E-04, 0.584E-04, 1.19E-04" 7.93 53 AGE PROBABLY TOO YOUNG 7684 1 86.6 biotite conventional K-Ar KA 1562 "4.72E-04, 0.584E-04, 1.19E-04" 8.648 92 age of intrusion "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" 7736 1 11.1 0.2 sanidine conventional K-Ar 1. JMP-1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.23 1.002 70 age of volcanism 7737 1 11.4 0.6 sanidine conventional K-Ar 2. RYN-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 1.522 44 age of volcanism 7738 1 10.97 0.7 sanidine conventional K-Ar 3. BN-A "4.72E-04, 0.585E-04, 1.19E-04*" 7.85 1.244 38 age of volcanism 7739 1 14.2 0.4 sanidine conventional K-Ar 4. PS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.86 1.612 60 age of volcanism 7740 1 13.5 0.2 sanidine conventional K-Ar 5. PS-A "4.962E-04, 0.581E-04, 1.1167E-04" 1.8675 75 age of volcanism 9.6 7741 1 12 0.2 sanidine conventional K-Ar 6. PS-C "4.962E-04, 0.581E-04, 1.1167E-04" 9.62 1.663 76 age of volcanism 7742 1 10 1.5 plagioclase conventional K-Ar 7. JK-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3655 0.1967 20 age of volcanism "K2O = 1.362, 1.369" 7743 1 9.6 2 plagioclase conventional K-Ar 8. JK-B "4.962E-04, 0.581E-04, 1.1167E-04" 1.523 0.2113 16 age of volcanism 7744 1 11 0.6 plagioclase conventional K-Ar 9. BEN-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.276 0.2023 42 age of volcanism 7745 1 9.6 0.2 sanidine conventional K-Ar 10. SF-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.63 1.19 74 age of volcanism 7746 1 10.1 0.3 plagioclase conventional K-Ar 11. W-194 "4.962E-04, 0.581E-04, 1.1167E-04" 0.983 0.1439 67 age of volcanism K = 0.816 % 7747 1 11 1.3 plagioclase conventional K-Ar 12. CAS-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.87 0.1384 25 AGE IS APPARENTLY TOO OLD 7748 1 10.1 0.1 sanidine conventional K-Ar 13. CAS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.46 1.381 81 age of volcanism 7749 1 8.1 0.7 whole rock conventional K-Ar 14. SRP70-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.358 0.412 11 K = 0.297 % AGE APPARENTLY TOO LOW; BEST ESTIMATE IS 9.4 M.Y. OLD FOR BASALT; PREVIOUS K-AR AGE OF 13.8 M.Y. REPORTED BY ARMSTRONG AND OTHERS (1975). 7750 1 44.7 0.8 biotite conventional K-Ar PC-RHYODACITE "4.962E-04, 0.581E-04, 1.1167E-04" 8.19 5.338 74 age of volcanism 7751 1 3.8 0.2 whole rock conventional K-Ar 1. SPR 70-16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.657 0.0361 19 K=0.545% "AGE OF BASALT IS PROBABLY 4-5 M.Y. OLD; AN AGE OF 6.0 M.Y. PREVIOUSLY REPORTED FOR THIS SAMPLE (ARMSTRONG AND OTHERS, 1975)." 7752 1 4.2 0.2 whole rock conventional K-Ar 2. DG-9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.83 0.0507 27 K=0.689% BASALT IS PROBABLY ABOUT 4 M.Y. OLD. 7753 1 2.6 0.3 whole rock conventional K-Ar 3. SRP 69-55 "4.962E-04, 0.581E-04, 1.1167E-04" 0.373 0.0137 8 K=0.310% AGE OF BASALT IS APPROXIMATELY 4 M.Y.; AGE OF 6.3 M.Y. PREVIOUSLY REPORTED FOR THIS SAMPLE BY ARMSTRONG AND OTHERS (1975). 7754 1 3.6 0.2 whole rock conventional K-Ar 4. SRD-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.034 0.0541 35 K=0.858% AGE OF BASALT IS APPROXIMATELY 4 M.Y. 7755 1 0.2 0.2 whole rock conventional K-Ar 1. B-132 "4.962E-04, 0.581E-04, 1.1167E-04" 0.676 0.0023 1 age of volcanism K=0.561% 7756 1 2.3 0.1 whole rock conventional K-Ar 2. B-144 "4.962E-04, 0.581E-04, 1.1167E-04" 5.16 0.1691 49 age of volcanism K=4.28% 7757 1 2.3 0.1 whole rock conventional K-Ar 3. B-126A "4.962E-04, 0.581E-04, 1.1167E-04" 5.2 0.1715 37 age of volcanism K=4.32% 7758 1 2.1 0.1 sanidine conventional K-Ar 4. B-88C "4.962E-04, 0.581E-04, 1.1167E-04" 7.1 0.219 53 age of volcanism K=5.89% 7759 1 2.5 0.5 whole rock conventional K-Ar 5. B-168 "4.962E-04, 0.581E-04, 1.1167E-04" 0.467 0.0171 4 age of volcanism K=0.388% 7760 1 3.1 0.2 whole rock conventional K-Ar 6. B-135 "4.962E-04, 0.581E-04, 1.1167E-04" 0.314 0.0142 12 age of volcanism K=0.261% 7761 1 4.3 0.15 whole rock conventional K-Ar 7. B-189 "4.962E-04, 0.581E-04, 1.1167E-04" 5.16 0.3178 48 age of volcanism K=4.28% 7762 1 6.3 0.2 whole rock conventional K-Ar 8. B-243 "4.962E-04, 0.581E-04, 1.1167E-04" 1.31 0.1197 69 age of volcanism K=1.09% 7763 1 54.18 2 biotite conventional K-Ar 1. NR-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.614 5.237 51 age of volcanism K=5.490% 7764 1 48.99 1.8 biotite conventional K-Ar 2. CM-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.663 5.479 43 age of volcanism K=6.361% 7764 2 48.99 2.1 feldspar conventional K-Ar 2. CM-2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.961 1.402 19 age of volcanism APPEARS TO BE A MIXTURE OF K-FELDSPAR AND PLAGIOCLASE K=1.628% 7765 1 47.32 2 whole rock conventional K-Ar 3. CC-1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.78 1.919 65 age of volcanism K=2.308% 7766 1 45.96 1.6 whole rock conventional K-Ar 4. BM-1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.09 1.4006 85 age of volcanism K=1.735% 7767 1 22.1 0.6 sanidine conventional K-Ar 1. SQ17 "4.962E-04, 0.581E-04, 1.1167E-04" 4.39 1.403 58 AUTHORS THINK THAT THE AGE SHOULD BE ABOUT 24 M.Y. 7768 1 20.6 0.6 biotite conventional K-Ar 2. SQ19 "4.962E-04, 0.581E-04, 1.1167E-04" 7.25 2.1145 2928 40AR-RAD=2.108 AND 2.221 X E-10 MOL/GM AUTHORS THINK THAT THE AGE SHOULD BE 22 OR 23 M.Y. 7769 1 22.6 0.7 biotite conventional K-Ar 3. SQ13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.56 2.796 68 age of volcanism "K20=8.75, 8.47, 8.46%" 7770 1 26.7 0.8 biotite conventional K-Ar 4. SQ29 "4.962E-04, 0.581E-04, 1.1167E-04" 8.34 3.144 64 age not evaluated 7771 1 26.3 0.8 hornblende conventional K-Ar 5. SQ21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.953 0.363 47 age of volcanism 7771 2 26.6 0.8 biotite conventional K-Ar 5. SQ21 "4.962E-04, 0.581E-04, 1.1167E-04" 6.88 2.652 75 age of volcanism 7772 1 26.6 0.8 biotite conventional K-Ar 6. SQ18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.18 3.156 71 age of volcanism 7773 1 27.4 0.8 biotite conventional K-Ar 7. SQ15 "4.962E-04, 0.581E-04, 1.1167E-04" 7.05 2.803 80 age of volcanism 7773 2 25.7 0.8 plagioclase conventional K-Ar 7. SQ15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.652 0.2422 68 "AGE IS TOO YOUNG, SEE BIOTITE AGE." 7774 1 7.5 0.4 whole rock conventional K-Ar 8. SQ16 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.1397 26 age of volcanism 7775 1 10 7.5 plagioclase conventional K-Ar 9. SQ24 "4.962E-04, 0.581E-04, 1.1167E-04" 0.31 4.339 1 age not evaluated HIGH ANALYTICAL UNCERTAINTY 7776 1 14.1 2.3 plagioclase conventional K-Ar 10. SQ34 "4.962E-04, 0.581E-04, 1.1167E-04" 0.771 0.1524 7 age of volcanism 7777 1 14.3 0.4 hornblende conventional K-Ar 11. SQ10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.793 0.1637 58 age of intrusion 7778 1 14 0.4 hornblende conventional K-Ar 12. SQ14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.835 0.1689 55 age of volcanism 7779 1 117 4 hornblende conventional K-Ar 13. SQ11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.14 1.969 76 minimum age of intrusion 7779 2 81 2.4 biotite conventional K-Ar 13. SQ11 "4.962E-04, 0.581E-04, 1.1167E-04" 5.7 6.793 86 initial age disturbed by later metamorphism 7780 1 158 5 hornblende conventional K-Ar 14. SQ22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.661 1.566 83 minimum age of intrusion 7780 2 103 3 biotite conventional K-Ar 14. SQ22 "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 12.62 92 initial age disturbed by later metamorphism 7781 1 143 4 biotite conventional K-Ar 15. SQ38 "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 17.71 94 initial age disturbed by later metamorphism 7782 1 148 4 hornblende conventional K-Ar 16. AD44 "4.962E-04, 0.581E-04, 1.1167E-04" 0.673 1.492 92 age of intrusion 7783 1 138 4 hornblende conventional K-Ar 17. AD47 "4.962E-04, 0.581E-04, 1.1167E-04" 0.956 1.98 91 minimum age of intrusion 7783 2 81.9 2.5 Unk conventional K-Ar 17. AD47 "4.962E-04, 0.581E-04, 1.1167E-04" 7.87 9.485 87 initial age disturbed by later metamorphism 7798 5 Unk no decay constants given age of volcanism 7806 1 82.81 biotite conventional K-Ar I-2031 "4.72E-04, 0.584E-04, 1.19E-04*" 9.23 11.261 93 minimum age of intrusion 7807 1 76.8 biotite conventional K-Ar W-90 "4.72E-04, 0.584E-04, 1.19E-04*" 9.32 10.528 75 AGE MAY BE LOW; 81 M.Y. GIVEN BY ANOTHER BIOTITE SEPARATE 7808 1 126.14 biotite conventional K-Ar I-2107 "4.72E-04, 0.584E-04, 1.19E-04*" 7.7 14.484 95 minimum age of intrusion 7809 1 159.18 biotite conventional K-Ar W-53 "4.72E-04, 0.584E-04, 1.19E-04*" 7.12 17.058 91 minimum age of intrusion MAY BE A REDUCED AGE 7810 1 160.64 biotite conventional K-Ar I-305 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 20.197 97 minimum age of intrusion MAY BE A REDUCED AGE 7830 1 1635.47 biotite conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04*" 9.64 369.5 75 age of later metamorphism K = 8.00 % 7831 1 1815.07 biotite conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 407.8 46 initial age disturbed by later metamorphism K = 7.51 % 7832 1 1766.32 biotite conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.19E-04*" 9.22 398 56 initial age disturbed by later metamorphism K = 7.65 % 7833 1 2258.41 biotite conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04*" 9.24 599.2 67 initial age disturbed by later metamorphism K = 7.67 % 7834 1 2150 biotite conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 7835 1 2160 muscovite conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 7836 1 1921.28 muscovite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04*" 9.97 492.2 52 initial age disturbed by later metamorphism K = 8.28 % 7837 1 1822.93 muscovite conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04*" 8.36 379.3 46 initial age disturbed by later metamorphism K = 6.94 % 7838 1 5581.98 enstatite conventional K-Ar DS-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.0053 2.9 89 99.9 % PURE BRONZITE CONCENTRATE K = 0.0044 % AGE TOO OLD; EXCESS ARGON PRESENT 7839 1 3967.35 enstatite conventional K-Ar DS-4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.0045 0.937 83 99.9 % PURE BRONZITE CONCENTRATE K = 0.0037 % AGE TOO OLD; EXCESS ARGON PRESENT 7840 1 6013.71 enstatite conventional K-Ar DS-5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.0094 6.6 9595 98 % PURE BRONZITE CONCENTRATE K = 0.0078 %; 40 AR = 6.74 AND 6.47 X E(-10) MOL/GM. AGE IS TOO OLD; EXCESS ARGON PRESENT. 7840 2 2450.7 biotite conventional K-Ar DS-5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.9 593 97 initial age disturbed by later metamorphism 95 % PURE BIOTITE CONCENTRATE K = 6.56 % 7841 1 2579.25 biotite conventional K-Ar DS-6 "4.72E-04, 0.584E-04, 1.19E-04*" 7.84 647 99 initial age disturbed by later metamorphism 98 % PURE BIOTITE CONCENTRATE K = 6.51 % 7842 1 5209.53 hypersthene conventional K-Ar BG-61-65 "4.72E-04, 0.584E-04, 1.19E-04*" 0.0077 3.39 99 99 % PURE HYPERSTHENE CONCENTRATE K = 0.0064 %; 40 AR = 3.36 AND 3.4 X E(-10) MOL/GM. AGE IS TOO OLD; EXCESS ARGON PRESENT 7842 2 1926.17 90 plagioclase conventional K-Ar BG-61-65 "4.72E-04, 0.584E-04, 1.19E-04*" 0.1053 5.22 92 initial age disturbed by later metamorphism 99.9 % PURE PLAGIOCLASE CONCENTRATE K = 0.0874 % 7843 1 2.15 0.1 whole rock conventional K-Ar 1. 128-0 A "4.962E-04, 0.581E-04, 1.1167E-04" 2.26 0.0717 30 minimum age of volcanism "K2O = 2.25, 2.27 %" 7843 2 2.52 0.19 plagioclase conventional K-Ar 1. 128-0 B "4.962E-04, 0.581E-04, 1.1167E-04" 0.841 0.0314 17 age of volcanism AN 58-62 PLAGIOCLASE "K2O = 0.845, 0.837 %" 7843 3 2.55 0.11 K feldspar conventional K-Ar 1. 128-0 D "4.962E-04, 0.581E-04, 1.1167E-04" 2.69 0.1014 27 age of volcanism AN ALKALI FELDSPAR AND PLAGIOCLASE MIXTURE "K2O = 2.68, 2.70 %" 7843 4 2.53 0.1 K feldspar conventional K-Ar 1. 128-0 E "4.962E-04, 0.581E-04, 1.1167E-04" 3.66 0.1369 27 age of volcanism "K2O = 3.65, 3.67 %" 7844 1 1.1 0.11 adularia conventional K-Ar 2. GS-6-100 "4.962E-04, 0.581E-04, 1.1167E-04" 9.995 0.1623 86 "K2O = 10.07, 10.07, 9.93, 9.02 %; 40 AR-RAD = 0.1453 AND 0.1792 X E(-10) MOL/GM." MINIMUM AGE FOR HYDROTHERMAL ALTERATION 7845 1 1.14 0.05 sanidine conventional K-Ar 3. SR-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.04 0.1525 48 age of volcanism "K2O = 9.06, 9.02 %" 7846 1 1.21 0.06 sanidine conventional K-Ar 4. SR-4 "4.962E-04, 0.581E-04, 1.1167E-04" 10.53 0.1893 33 age of volcanism "K2O = 10.53, 10.53 %" 7847 1 1.16 0.05 sanidine conventional K-Ar 5. SR-5 "4.962E-04, 0.581E-04, 1.1167E-04" 10.535 0.1801 51 age of volcanism 7847 2 3.03 0.12 glass conventional K-Ar 5. SR-5A "4.962E-04, 0.581E-04, 1.1167E-04" 4.677 0.2094 78 "K2O = 4.40, 4.38, 4.96, AND 4.97 %" "AGE IS TOO OLD, EXCESS ARGON PROBABLY PRESENT" 7848 1 2.97 0.09 glass conventional K-Ar 941-B "4.962E-04, 0.581E-04, 1.1167E-04" 4.72 0.2076 4561 "K2O = 4.85, 4.80, 4.63, 4.63 %" AGE IS TOO OLD; EXCESS ARGON PROBABLY PRESENT 7849 1 1.51 0.22 K feldspar conventional K-Ar 6. SR-3 "4.962E-04, 0.581E-04, 1.1167E-04" 2.255 0.0502 14 age of volcanism "K2O = 2.27, 2.24 %" 7849 2 1.51 0.06 glass conventional K-Ar 6. SR-3A "4.962E-04, 0.581E-04, 1.1167E-04" 4.42 0.0987 27 age of volcanism "K2O = 4.43, 4.29, 4.58, 4.38 %" 7850 1 82 0.3 plagioclase conventional K-Ar 7.MR-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.039 0.1261 34 age of volcanism "K20=1.039, 1.039%" 7851 1 10.9 0.3 biotite conventional K-Ar 8. C-3 "4.962E-04, 0.581E-04, 1.1167E-04" 7.705 1.2485 3443 age of volcanism "K20=7.69, 7.72%; 40AR-RAD=1.275 AND 1.222 X E-10 MOL/GM" 7851 2 9.7 0.3 plagioclase conventional K-Ar 8. C-3A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0813 0.1186 42 minimum age of volcanism "K20=0.812, 0.813%" 7852 1 1242 50 muscovite conventional K-Ar 471 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 226 98 -100 +140 MESH SIZE "AGE OF DETRITAL MUSCOVITE, NOT THE AGE OF PIOCHE SHALE." 7853 1 87.4 2.2 biotite conventional K-Ar 478 "4.962E-04, 0.581E-04, 1.1167E-04" 10.99 14.16 95 maximum age of metamorphic crystallization 7854 1 51.1 1.4 muscovite conventional K-Ar 501 "4.962E-04, 0.581E-04, 1.1167E-04" 10.79 8.056 92 MAY BE A AYBRID AGE 7854 2 43.3 1.6 biotite conventional K-Ar 501 "4.962E-04, 0.581E-04, 1.1167E-04" 9.41 5.94 82 PROBABLY A HYBRID AGE 7855 1 57.1 1.7 muscovite conventional K-Ar 503 "4.962E-04, 0.581E-04, 1.1167E-04" 10.86 9.062 90 -60 +100 MESH SIZE PROBABLY A HYBRID AGE 7856 1 54.1 1.7 muscovite conventional K-Ar 505 "4.962E-04, 0.581E-04, 1.1167E-04" 11.03 8.712 63 PROBABLY A HYBRID AGE 7857 1 55.2 1.5 muscovite conventional K-Ar 506 "4.962E-04, 0.581E-04, 1.1167E-04" 11.02 8.895 90 PROBABLY A HYBRID AGE 7857 2 50.2 2.1 biotite conventional K-Ar 506 "4.962E-04, 0.581E-04, 1.1167E-04" 7.42 5.44 90 PROBABLY A HYBRID AGE 7858 1 20.8 0.5 muscovite conventional K-Ar 547 "4.962E-04, 0.581E-04, 1.1167E-04" 10.54 3.177 67 -30 +60 MESH SIZE A HYBRID AGE 7859 1 22.7 0.5 muscovite conventional K-Ar 548 "4.962E-04, 0.581E-04, 1.1167E-04" 10.8 3.545 71 -60 +100 MESH A HYBRID AGE 7859 2 22.5 0.5 muscovite conventional K-Ar 548 "4.962E-04, 0.581E-04, 1.1167E-04" 10.8 3.522 75 -60 +100 MESH; MUSCOVITE SUBJECT TO ONE HOUR OF ULTRASONIC VIBRATION. A HYBRID AGE 7860 1 30.5 1 muscovite conventional K-Ar 549 "4.962E-04, 0.581E-04, 1.1167E-04" 7.18 3.177 48 -60 +140 MESH; SPECIFIC GRAVITY LESS THAN 2.86 A HYBRID AGE; MUSCOVITE APPEARS TO BE LESS RETENTIVE OF RADIOGENIC AGRON THAN COEXISTING BIOTITE; MAY BE DUE TO LOW-POTASSIUM INDUCED UNIT-CELL STRAIN 7860 2 30.4 1 muscovite conventional K-Ar 549 "4.962E-04, 0.581E-04, 1.1167E-04" 7.12 3.142 35 -60 +140 MESH; SPECIFIC GRAVITY GREATER THAN 2.86 A HYBRID AGE 7860 3 47.1 1.6 biotite conventional K-Ar 549 "4.962E-04, 0.581E-04, 1.1167E-04" 9.07 6.234 86 -60 +100 MESH A HYBRID AGE 7861 1 40.7 1.4 muscovite conventional K-Ar 558 "4.962E-04, 0.581E-04, 1.1167E-04" 9.99 5.924 83 -60 +140 MESH A HYBRID AGE 7862 1 30.7 1 biotite conventional K-Ar 560 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 3.895 84 -60 +140 MESH A PROBABLE HYBRID AGE 7863 1 36.9 0.8 muscovite conventional K-Ar 561 "4.962E-04, 0.581E-04, 1.1167E-04" 10.69 5.731 74 -60 +100 MESH A HYBRID AGE 7864 1 36.5 0.8 muscovite conventional K-Ar 562 "4.962E-04, 0.581E-04, 1.1167E-04" 10.56 5.602 68 -60 +140 MESH A HYBRID AGE 7865 1 69.2 1.6 muscovite conventional K-Ar RM-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.07 10.22 69 minimum age of intrusion "-10 +30 MESH, VERY COARSE MUSCOVITE" 7866 1 50.9 1.8 muscovite conventional K-Ar 244 "4.962E-04, 0.581E-04, 1.1167E-04" 10.78 8.012 56 A HYBRID AGE 7867 1 47.9 2 muscovite conventional K-Ar 245 "4.962E-04, 0.581E-04, 1.1167E-04" 10.79 7.545 45 A HYBRID AGE 7868 1 24.7 1.1 muscovite conventional K-Ar 564 "4.962E-04, 0.581E-04, 1.1167E-04" 6.31 2.264 83 MUSCOVITE + QUARTZ MIXTURE A HYBRID AGE DUE TO MOVEMENT OF UPPER THRUST PLATE 7869 1 28.6 2.5 biotite conventional K-Ar 566 "4.962E-04, 0.581E-04, 1.1167E-04" 6.63 2.754 56 minimum age of intrusion BIOTITE + QUARTZ MIXTURE 7869 2 34.3 1.1 amphiboles conventional K-Ar 566 "4.962E-04, 0.581E-04, 1.1167E-04" 0.553 0.2752 61 age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION 7870 1 25.5 0.9 biotite conventional K-Ar 567 "4.962E-04, 0.581E-04, 1.1167E-04" 8.22 3.04 82 BIOTITE + QUARTZ MIXTURE A HYBRID AGE DUE TO MOVEMENT OF UPPER THRUST PLATE 7871 1 108 4 muscovite conventional K-Ar 472 "4.962E-04, 0.581E-04, 1.1167E-04" 7.62 12.21 94 MUSCOVITE AND QUARTZ MIXTURE A HYBRID AGE DUE TO MIXTURE OF DETRITAL AND METAMORPHIC MUSCOVITE 7872 1 437 16 muscovite conventional K-Ar 473 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 65.26 93 -100 +200 MESH; MUSCOVITE AND QUARTZ MIXTURE PROBABLY A REDUCED AGE COMING MAINLY FROM THE DETRITAL MUSCOVITE 7873 1 105 4 muscovite conventional K-Ar 476 "4.962E-04, 0.581E-04, 1.1167E-04" 8.56 13.27 91 MUSCOVITE + QUARTZ MIXTURE A HYBRID AGE DUE TO MIXTURE OF DETRITAL AND METAMORPHIC MUSCOVITE 7874 1 183 6 muscovite conventional K-Ar 499 "4.962E-04, 0.581E-04, 1.1167E-04" 8.39 23.24 97 MUSCOVITE + QUARTZ MIXTURE A HYBRID AGE DUE TO MIXTURE OF DETRITAL AND METAMORPHIC MUSCOVITE 7875 1 73.8 2.4 muscovite conventional K-Ar 536 "4.962E-04, 0.581E-04, 1.1167E-04" 6.92 7.503 87 age of metamorphic crystallization MUSCOVITE + QUARTZ 7876 1 307 7 muscovite conventional K-Ar 552 "4.962E-04, 0.581E-04, 1.1167E-04" 5.82 28.01 96 MUSCOVITE + QUARTZ MIXTURE A PROBABLE HYBRID AGE DUE TO THE PRESENCE OF BOTH DETRITAL AND METAMORPHIC MUSCOVITE 7877 1 99.3 3.3 muscovite conventional K-Ar 554 "4.962E-04, 0.581E-04, 1.1167E-04" 9 13.22 92 MUSCOVITE + QUARTZ MIXTURE A PROBABLE HYBRID AGE DUE TO THE PRESENCE OF BOTH DETRITAL AND METAMORPHIC MUSCOVITE. 7878 1 141 5 muscovite conventional K-Ar 555 "4.962E-04, 0.581E-04, 1.1167E-04" 9.91 20.97 97 MUSCOVITE + QUARTZ MIXTURE A PROBABLE HYBRID AGE DUE TO THE PRESENCE OF BOTH DETRITAL AND METAMORPHIC MUSCOVITE. 7879 1 196 7 sericite conventional K-Ar 2-MW-60 "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 25.3 98 AGE MAY INDICATE TIME OF MINERALIZATION OR THE AGE MAY BE TOO OLD DUE TO EXCESS ARGON. 7880 1 86.3 1.9 muscovite conventional K-Ar 378 "4.962E-04, 0.581E-04, 1.1167E-04" 10.72 13.67 88 -100 +200 MESH AGE MAY BE 1. THE APPROXIMATE AGE OF THE PLUTON OR 2 A REDUCED AGE. 7881 1 82.2 1.8 muscovite conventional K-Ar 531 "4.962E-04, 0.581E-04, 1.1167E-04" 10.47 12.67 89 -100 +200 MESH AGE MAY BE 1. THE APPROXIMATE AGE OF THE PLUTON OR 2. A REDUCED AGE. 7882 1 77.9 1.8 muscovite conventional K-Ar 532 "4.962E-04, 0.581E-04, 1.1167E-04" 10.32 11.83 89 -100 +200 MESH "AGE MAY BE 1. THE APPROXIMATE AGE OF THE PLUTON, OR 2. A REDUCED AGE." 7883 1 63.6 2.4 muscovite conventional K-Ar 427 "4.962E-04, 0.581E-04, 1.1167E-04" 10.5 9.792 88 -100 +200 MESH A HYBRID AGE 7884 1 45.8 1.9 biotite conventional K-Ar 428 "4.962E-04, 0.581E-04, 1.1167E-04" 8.51 5.68 79 -100 +200 MESH A HYBRID AGE 7884 2 61.7 2.3 muscovite conventional K-Ar 428 "4.962E-04, 0.581E-04, 1.1167E-04" 10.36 9.356 85 A HYBRID AGE 7885 1 86.1 2.4 muscovite conventional K-Ar 430 "4.962E-04, 0.581E-04, 1.1167E-04" 10.48 13.3 90 "A MIXED AGE, CLASTIC AND AUTHIGENIC MUSCOVITE BOTH PRESENT" 7886 1 617 22 muscovite conventional K-Ar 435 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 90.37 99 MUSCOVITE + QUARTZ AGE GIVEN BY DETRITAL MUSCOVITE 7887 1 1177 30 muscovite conventional K-Ar 571 "4.962E-04, 0.581E-04, 1.1167E-04" 10.09 241.1 99 -60 MESH AGE OF DETRITAL MUSCOVITE 7888 1 98 2.9 amphiboles conventional K-Ar 572 "4.962E-04, 0.581E-04, 1.1167E-04" 0.332 0.4815 61 minimum age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION 7889 1 90.2 3.1 muscovite conventional K-Ar 368 "4.962E-04, 0.581E-04, 1.1167E-04" 8.41 11.19 83 age not evaluated MUSCOVITE + QUARTZ 7890 1 35.2 1.2 biotite conventional K-Ar 393 "4.962E-04, 0.581E-04, 1.1167E-04" 8.72 4.463 84 age of intrusion 7891 1 34.7 1.2 biotite conventional K-Ar 394 "4.962E-04, 0.581E-04, 1.1167E-04" 8.45 4.26 86 age of intrusion 7891 2 35.8 0.8 amphiboles conventional K-Ar 394 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.5356 64 age of intrusion 7892 1 1199 40 muscovite conventional K-Ar 538 "4.962E-04, 0.581E-04, 1.1167E-04" 9.86 241.5 99 MUSCOVITE + QUARTZ MIXTURE "AGE OF DETRITAL MUSCOVITE, NOT TIME OF SHALE FORMATION" 7893 1 66.9 1.5 muscovite conventional K-Ar 569 "4.962E-04, 0.581E-04, 1.1167E-04" 10.89 10.68 93 A HYBRID AGE 7894 1 1205 29 muscovite conventional K-Ar 575 "4.962E-04, 0.581E-04, 1.1167E-04" 10.41 256.8 98 AGE OF THE DETRIATL MUSCOVITE; NOT THE AGE OF SEDIMENTATION 7895 1 1182 40 muscovite conventional K-Ar 576 "4.962E-04, 0.581E-04, 1.1167E-04" 9.93 238.6 99 AGE OF DETRITAL MUSCOVITE; NOT THE AGE OF SEDIMENTATION. 7896 1 25.2 0.7 muscovite conventional K-Ar 383 "4.962E-04, 0.581E-04, 1.1167E-04" 10.44 3.807 89 MUSCOVITE + QUARTZ MIXTURE A HYBRID AGE 7897 1 36.2 1 muscovite conventional K-Ar 384 "4.962E-04, 0.581E-04, 1.1167E-04" 10.46 5.503 90 MUSCOVITE + QUARTZ MIXTURE A HYBRID AGE 7898 1 34.9 1 muscovite conventional K-Ar 386 "4.962E-04, 0.581E-04, 1.1167E-04" 10.3 5.218 84 MUSCOVITE + QUARTZ MIXTURE A HYBRID AGE 7899 1 65.4 2.4 muscovite conventional K-Ar 439 "4.962E-04, 0.581E-04, 1.1167E-04" 8.12 7.787 84 MUSCOVITE + QUARTZ MIXTURE PROBABLY A HYBRID AGE 7900 1 72.5 2 muscovite conventional K-Ar 511 "4.962E-04, 0.581E-04, 1.1167E-04" 10.89 11.59 92 HYBRID AGE PROBABLY DUE TO THERMAL EFFECTS OF NEARBY PLUTON OR OVERLYING THRUST PLATE 7901 1 75.6 2.1 muscovite conventional K-Ar 512 "4.962E-04, 0.581E-04, 1.1167E-04" 10.85 12.06 93 HYBRID AGE PROBABLY DUE TO THERMAL EFFECTS OF NEARBY PLUTON OR OVERLYING THRUST PLATE. 7902 1 5.96 0.2 glass conventional K-Ar D2402 GL "4.72E-04, 0.585E-04, 1.19E-04*" 2.15 0.1847 72 age of intrusion "K20=2.17, 2.13%" 7903 1 18.55 0.6 biotite conventional K-Ar D2468B "4.72E-04, 0.585E-04, 1.19E-04*" 8.535 2.291 84 age of intrusion 7904 1 19.73 0.7 biotite conventional K-Ar D2408B "4.72E-04, 0.585E-04, 1.19E-04*" 6.09 1.739 55 age of intrusion "K20=6.12, 6.06%" 7905 1 21.97 0.6 plagioclase conventional K-Ar 2384-1P "4.72E-04, 0.584E-04, 1.19E-04*" 0.767 0.2441 77 age of volcanism "K20=0.770, 0.765, 0.767%" 7905 2 23.08 0.6 hornblende conventional K-Ar 2384-1H "4.72E-04, 0.584E-04, 1.19E-04*" 0.5815 0.1945 60 age of volcanism "K20=0.580, 0.583%" 7906 1 21.31 0.7 biotite conventional K-Ar D2470B "4.72E-04, 0.585E-04, 1.19E-04*" 8.17 2.522 80 age of volcanism 7907 1 13.84 0.5 plagioclase conventional K-Ar 2605-5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.225 0.045 40 age of volcanism 7908 1 24.1 0.6 biotite conventional K-Ar D2536B "4.72E-04, 0.585E-04, 1.19E-04*" 8.48 2.962 28 age of volcanism 7909 1 23.78 0.8 biotite conventional K-Ar D2395B "4.72E-04, 0.585E-04, 1.19E-04*" 8.375 2.886 72 age of volcanism "K20=8.40, 8.33%" 7910 1 23.14 0.6 biotite conventional K-Ar 2306-7B "4.72E-04, 0.584E-04, 1.19E-04*" 8.385 2.811 64 age of volcanism "K20=8.41, 8.36%" 7910 2 22.08 0.6 plagioclase conventional K-Ar 2306-7P "4.72E-04, 0.584E-04, 1.19E-04*" 0.824 0.2635 72 minimum age of volcanism "K20=0.823, 0.825%" 7911 1 23.9 0.6 biotite conventional K-Ar D2543B "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 3.014 68 age of volcanism 7912 1 23.36 0.5 biotite conventional K-Ar D2572B "4.72E-04, 0.585E-04, 1.19E-04*" 7.41 2.508 64 age of volcanism 7913 1 25.63 1 sanidine conventional K-Ar MLS-73-9 "4.72E-04, 0.584E-04, 1.19E-04*" 7.915 2.941 61 age of volcanism "K20=7.91, 7.92%" 7914 1 26.74 0.8 sanidine conventional K-Ar MLS-73-10 "4.72E-04, 0.584E-04, 1.19E-04*" 10.265 3.981 82 age of volcanism "K20=10.26, 10.27%" 7915 1 28.29 0.8 sanadine conventional K-Ar 3289-105 "4.72E-04, 0.584E-04, 1.19E-04*" 10.63 4.363 87 age of volcanism "K20=10.63, 10.63%" 7915 2 25 0.7 plagioclase conventional K-Ar 3289-10P "4.72E-04, 0.584E-04, 1.19E-04*" 1.07 0.3878 82 "K20=1.08, 1.06%" AGE APPEARS TO BE TOO LOW 7916 1 27.9 0.9 biotite conventional K-Ar D2337B "4.72E-04, 0.585E-04, 1.19E-04*" 8.015 3.244 81 age of volcanism "K20=8.05, 7.98%" 7916 2 28.69 0.6 sanidine conventional K-Ar D2337S "4.72E-04, 0.585E-04, 1.19E-04*" 10.415 4.337 85 age of volcanism "K20=10.46, 10.37%" 7917 1 26.95 0.9 biotite conventional K-Ar D2374B "4.72E-04, 0.585E-04, 1.19E-04*" 8.015 3.133 78 age of volcanism "K20=8.03, 8.00%" 7918 1 27.33 0.9 biotite conventional K-Ar D2469B "4.72E-04, 0.585E-04, 1.19E-04*" 8.05 3.191 80 age of volcanism 7918 2 26.33 0.6 sanidine conventional K-Ar D2469S "4.72E-04, 0.585E-04, 1.19E-04*" 5.53 2.112 52 age of volcanism 7919 1 10.23 0.6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.79 0.1167 41 age of intrusion "ANALYTICAL DATA FROM MARVIN AND DOBSON, 1979." "THE AGE IS 10.2 M.Y. IF THE NEW DECAY CONSTANTS ARE USED (SEE MARVIN AND DOBSON, 1979, ENTRY 130, P. 16, ISOCHRON/WEST)." 7925 1 78.8 3 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.443 0.526 45 minimum age of intrusion 7925 2 84.1 2.1 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 5.77 7.319 83 age of intrusion 7926 1 91.2 2.5 biotite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.46 11.665 73 age of intrusion 7927 1 16.2 0.5 biotite conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.23 2.213 31 age of intrusion 7928 1 100 biotite conventional K-Ar 5A "4.962E-04, 0.581E-04, 1.1167E-04" 7.94 11.91 75 age of intrusion 7928 2 95.8 2.9 biotite conventional K-Ar 5B "4.962E-04, 0.581E-04, 1.1167E-04" 7.3 104.5 89 minimum age of intrusion "THIS AGE PREVIOUSLY PUBLISHED BY GARSIDE AND SILBERMAN, 1978." 7929 1 87 2.4 muscovite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 9.95 13.795 87 age of intrusion 7929 2 89.8 2 biotite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 9.34 12.674 36 age of intrusion 7949 1 69.4 1.6 zircon conventional K-Ar 79P089 "4.962E-04, 0.581E-04, 1.1167E-04" 10.33 10.52 90 APPROXIMATE AGE OF ALTERATION 7950 1 66 2.2 zircon conventional K-Ar 79P173 "4.962E-04, 0.581E-04, 1.1167E-04" 9.87 9.55 91 APPROXIMATE TIME OF ALTERATION 7951 1 3.3 1 whole rock conventional K-Ar KA72-219 "4.72E-04, 0.584E-04, 1.19E-04*" 0.93 0.0442 534 age of volcanism "K=0.75, 0.79, 0.77%; RAD. 40-AR=0.0100, 0.0098, AND 0.0099 X E-5 SCC/GM" 7952 1 3.68 1 whole rock conventional K-Ar KA72-213 "4.72E-04, 0.584E-04, 1.19E-04*" 0.849 0.0451 6 age of volcanism "K=0.72, 0.69%" 7952 2 3.43 1 whole rock conventional K-Ar KA72-213 "4.72E-04, 0.584E-04, 1.19E-04*" 0.849 0.0419 4 age of volcanism "K=0.72, 0.69%" 7953 1 1284 40 muscovite conventional K-Ar AWL-16-66 "4.78E-04, 0.588E-04, 1.21E-04*" 10.02 270 98 age of intrusion "K=8.32, 8.31%" 7954 1 827 24 albite conventional K-Ar AWL-19-66C "4.78E-04, 0.588E-04, 1.21E-04*" 0.646 9.754 99 "K=0.538, 0.535%" "SPURIOUS AGE, MINERAL HAS LOST RADIOGENIC ARGON." 7954 2 763 23 albite conventional K-Ar AWL-19-66F "4.78E-04, 0.588E-04, 1.21E-04*" 0.416 5.687 97 "K=0.34, 0.35%" "SPURIOUS AGE, MINERAL HAS LOST RADIOGENIC ARGON" 7955 1 1610 50 spodumene conventional K-Ar AWL-15-66 "4.78E-04, 0.588E-04, 1.21E-04*" 0.54 20.19 99 K=0.45% "AGE APPARENTLY TOO OLD, EXCESS ARGON MAY BE PRESENT." 7955 2 1585 50 glaucophane-crossite conventional K-Ar AWL-15-66 "4.78E-04, 0.588E-04, 1.21E-04*" 0.54 19.75 86 K=0.45% "AGE APPARENTLY TOO OLD, EXCESS ARGON MAY BE PRESENT." 7956 1 98 2.9 muscovite conventional K-Ar AWL-23-66 "4.78E-04, 0.588E-04, 1.21E-04*" 10.35 15 94 age of intrusion K=8.59% 7956 2 101 3 muscovite conventional K-Ar AWL-23-66 "4.78E-04, 0.588E-04, 1.21E-04*" 10.28 15.37 97 age of intrusion K=8.53% 7957 1 52.2 5.1 albite conventional K-Ar AWL-24-66 "4.78E-04, 0.588E-04, 1.21E-04*" 0.152 0.1159 19 "K=0.126, 0.126%" "SPURIOUS AGE, MINERAL HAS LOST RADIOGENIC ARGON" 7958 1 quartz AWL-25-66 "4.78E-04, 0.588E-04, 1.21E-04" 0 0.0396 29 NO AGE CALCULATED 7959 1 2490 80 muscovite conventional K-Ar AWL-6-67 "4.78E-04, 0.588E-04, 1.21E-04*" 10.43 806.4 100 minimum age of intrusion "K=8.66, 8.65%" 7960 1 2603 80 albite conventional K-Ar AWL-10-67 "4.78E-04, 0.588E-04, 1.21E-04*" 0.524 43.99 99 minimum age of intrusion "K=0.44, 0.43%" 7961 1 quartz AWL-8-67 "4.78E-04, 0.588E-04, 1.21E-04" 0.0163 7.424 97 "K=0.014, 0.013%; NO AGE CALCULATED" 7962 1 1611 50 muscovite conventional K-Ar AWL-3-66M "4.78E-04, 0.588E-04, 1.21E-04*" 9.99 374.3 99 age of intrusion "K=8.29, 8.29%" 7962 2 4823 150 albite conventional K-Ar AWL-3-66A "4.78E-04, 0.588E-04, 1.21E-04*" 0.128 44.85 99 "K=0.107, 0.106%" "SPURIOUS AGE, MINERAL PROBABLY CONTAINS EXCESS ARGON" 7963 1 beryl AWL-28-66 "4.78E-04, 0.588E-04, 1.21E-04" 0.058 79.31 98 "K=0.048, 0.048%; NO AGE CALCULATED" 7964 1 2070 60 quartz conventional K-Ar AWL-5-66 "4.78E-04, 0.588E-04, 1.21E-04*" 0.012 0.67 44 K=0.01% SPURIOUS AGE; MINERAL CONTAINS EXCESS ARGON. 7969 1 54 10 plagioclase conventional K-Ar B "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) 85% PLAGIOCLASE CONCENTRATE NO ANALYTICAL DATA GIVEN 7969 2 62 6 amphiboles conventional K-Ar B "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) 95% AMPHIBOLE CONCENTRATE NO ANALYTICAL DATA GIVEN 7970 1 18.9 1.6 glass conventional K-Ar C "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) "CLEAR SHARDS (65%), CLOUDY SHARDS (30%), QUARTZ AND FELDSPAR (5%)" NO ANALYTICAL DATA GIVEN 7971 1 74 8 glass conventional K-Ar D "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) ANALYTICAL DATA NOT GIVEN 7971 2 69 8 biotite conventional K-Ar D "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) "BIOTITE(45%)-AMPHIBOLE(50%)-FELDSPAR, GLASS, CARBONATE(5%)" ANALYTICAL DATA NOT GIVEN 7989 1 492.18 biotite conventional K-Ar AH-B1 no decay constants given* 1.84 14.99 68 minimum age of metamorphic crystallization K=1.53% 7990 1 544.75 biotite conventional K-Ar AH-F2 no decay constants given* 7.26 66.47 96 minimum age of intrusion K=6.03% 7991 1 1700.66 hornblende conventional K-Ar AH-W3 no decay constants given* 0.69 28.08 98 age of metamorphic crystallization K=0.57% 7992 1 1372.49 hornblende conventional K-Ar AH-W4 no decay constants given* 1.86 55.07 98 K=1.54% THIS IS PROBABLY A REDUCED AGE 7992 2 568.34 biotite conventional K-Ar AH-W44 no decay constants given* 5.55 53.38 68 K=4.61% "A REDUCED AGE, MAY INDICATE A THERMAL EVENT AROUND 560 M.Y. AGO." 7993 1 963 biotite conventional K-Ar AH-05 no decay constants given* 3.02 55.33 96 K=2.51 THIS IS PROBABLY A REDUCED AGE 7993 2 1650 hornblende conventional K-Ar AH-055 no decay constants given* 1.01 39.16 97 age of intrusion K=0.84% 7994 1 30.17 muscovite conventional K-Ar AH-L6 no decay constants given* 9.93 4.35 49 age of intrusion K=8.24% 7995 1 19.51 10 muscovite conventional K-Ar AH-L7 no decay constants given* 9.1 2.57 8 age not evaluated K=7.55% 7995 2 27.57 biotite conventional K-Ar AH-L77 no decay constants given* 8.1 3.24 73 minimum age of metamorphic crystallization K=6.72% 7996 1 229.04 biotite conventional K-Ar AH-A8 no decay constants given* 7.19 25.28 93 age not evaluated K=5.97% 7997 1 575.99 hornblende conventional K-Ar AH-L9 no decay constants given* 0.13 1.27 86 minimum age of metamorphic crystallization K=0.11% 7998 1 16.53 1.5 sanidine conventional K-Ar (NOT GIVEN) no decay constants given* 1.57 0.3753 76 age of volcanism "K=1.28, 1.32%; RADIOGENIC 40-AR=0.0016, 0.0015 PPM" 7999 1 30.9 2 muscovite conventional K-Ar (NOT GIVEN) no decay constants given* 9.7 4.353 48 age of intrusion "K=8.20, 7.90%" 8000 1 18.13 0.9 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.49 2.227 2473 "K=7.06, 7.04%; RADIOGENIC 40-AN=0.0085, 0.0092 PPM (THE LISTED 0.0052 PPM IS PROBABLY IN ERROR--COMPILER)" MAY BE THE TIME OF MINERALIZATION 8001 1 15.96 1.5 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.13 1.876 47 MIXTURE OF MUSCOVITE-BIOTITE "K=6.76, 6.75%" AGE OF MINERALIZATION 8002 1 7.85 0.8 adularia conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 11.05 1.251 78 "K=9.31, 9.30% (LISTED 9.41% IS PROBABLY IN ERROR--COMPILER)" MAY BE THE AGE OF MINERALIZATION 8008 1 3.44 0.44 glass conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.1797 16 age of volcanism 8008 1 3.44 0.44 glass conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.1797 16 age of volcanism 8008 1 3.44 0.44 glass conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.1797 16 age of volcanism 8088 1 0.79 0.08 glass conventional K-Ar 1. (75L-17) "4.962E-04, 0.581E-04, 1.1167E-04" 5.1 0.058 26 age of volcanism "K2O=5.10, 5.10%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8089 1 0.7 0.04 glass conventional K-Ar 2 (75L-15) "4.962E-04, 0.581E-04, 1.1167E-04*" 4.645 0.047 47 age of volcanism "K2O=4.63, 4.66%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8090 1 0.5 0.07 sanidine conventional K-Ar 3. (75L-16) "4.962E-04, 0.581E-04, 1.1167E-04" 8.11 0.059 18 age of volcanism "K2O=8.14, 8.08%" "AN AGE OF 0.51 M.Y. WAS REPORTED FOR THIS SAMPLE BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8091 1 0.75 0.1 glass conventional K-Ar 4. (75L-56) "4.962E-04, 0.581E-04, 1.1167E-04" 4.485 0.048 20 age of volcanism "K2O=4.48, 4.49%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8092 1 0.54 0.06 sanidine conventional K-Ar 5. (75L-18A) "4.962E-04, 0.581E-04, 1.1167E-04" 9.355 0.073 24 age of volcanism "K2O=9.36, 9.35%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8093 1 2.38 0.15 glass conventional K-Ar 6. (75L-19) "4.962E-04, 0.581E-04, 1.1167E-04" 4.92 0.168 46 age of volcanism "K2O=4.91, 4.93%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8094 1 2.33 0.12 sanidine conventional K-Ar 7. (75L-21) "4.962E-04, 0.581E-04, 1.1167E-04" 11.125 0.373 54 age of volcanism "K2O=11.13, 11.12%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8095 1 0.43 0.07 glass conventional K-Ar 8. (75L-23) "4.962E-04, 0.581E-04, 1.1167E-04" 4.665 0.029 16 age of volcanism "K2O=4.63, 4.70%" "THIS AGE ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8096 1 0.39 0.02 glass conventional K-Ar WM76-3 "4.962E-04, 0.581E-04, 1.1167E-04" 5.24 0.03 22 minimum age of volcanism "K2O=5.23, 5.25%" 8097 1 0.61 0.05 sanidine conventional K-Ar 9. (75L-53) "4.962E-04, 0.581E-04, 1.1167E-04" 9.23 0.08 32 age of volcanism "K2O=9.31, 9.15%" "AN AGE OF 0.60 M.Y. REPORTED FOR THIS SAMPLE BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8098 1 7.9 0.3 biotite conventional K-Ar 10. (MR76-26) "4.962E-04, 0.581E-04, 1.1167E-04" 8.735 1.011 62 age of volcanism "K2O=8.72, 8.75" 8100 1 38.23 1.3 biotite conventional K-Ar 70-2 "4.72E-04, 0.585E-04, 1.19E-04*" 6.29 3.499 78 age of intrusion 8101 1 40.62 1.4 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.95 4.702 73 age of intrusion 8102 1 154.32 5 biotite conventional K-Ar 15A "4.72E-04, 0.585E-04, 1.19E-04*" 7.73 17.93 93 age of intrusion 8103 1 156.46 5 biotite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 6.4 15.06 94 age of intrusion 8104 1 20.2 0.86 sanidine conventional K-Ar ST-R "4.962E-04, 0.581E-04, 1.1167E-04" 8.85 2.582 74 age of intrusion "K2O=8.86, 8.84%" "THIS AGE WAS ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8105 1 11.6 0.46 sanidine conventional K-Ar 75L-14A "4.962E-04, 0.581E-04, 1.1167E-04" 10.405 1.755 87 age of intrusion "K2O=10.44, 10.37%" "THIS AGE WAS ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8106 1 10.3 0.4 sanidine conventional K-Ar 75L-13A "4.962E-04, 0.581E-04, 1.1167E-04" 9.075 1.347 82 age of volcanism "K2O=9.11, 9.04%" "THIS AGE WAS ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8107 1 7.4 0.4 sanidine conventional K-Ar 75L-12 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 0.95 50 age of volcanism "K2O=8.96, 8.49%" "THIS AGE WAS ALSO REPORTED BY MEHNERT, ROWLEY, AND LIPMAN, 1978, ISOCHRON/WEST, NO. 21, P. 3-7." 8108 1 6.87 0.28 sanidine conventional K-Ar 10. DKA 3314 "4.962E-04, 0.581E-04, 1.1167E-04" 9.47 0.939 68 age of volcanism "K2O=9.57, 9.38, 9.47%" 8109 1 91.5 biotite conventional K-Ar KA 1568 "4.72E-04, 0.584E-04, 1.19E-04" 9.064 93 "-16 +28 MESH SIZE, HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 8109 2 96.3 hornblende conventional K-Ar KA 1568-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.056 83 "MESH SIZE(-16 +28), HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 8110 1 114 biotite conventional K-Ar KA 1630 "4.72E-04, 0.584E-04, 1.19E-04" 7.881 87 age of intrusion "MESH SIZE(-28 +60), HAND-PICKED MATERIAL" 8110 2 115 hornblende conventional K-Ar KA 1630-HBD "4.72E-04, 0.584E-04, 1.19E-04" 2.123 89 "MESH SIZE(-28 +60), HAND-PICKED MATERIAL" 8111 1 89.1 biotite conventional K-Ar KA 1633 "4.72E-04, 0.584E-04, 1.19E-04" 9.405 84 "MESH SIZE(-16 +28), HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 8111 2 120 hornblende conventional K-Ar KA 1633-HBD "4.72E-04, 0.584E-04, 1.19E-04" 1.011 83 "MESH SIZE(-16 +28), HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 8112 1 153 biotite conventional K-Ar KA 1702 "4.72E-04, 0.584E-04, 1.19E-04" 8.619 97 "MESH SIZE(-28 +60), HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 8112 2 150 hornblende conventional K-Ar KA 1702-HBD "4.72E-04, 0.584E-04, 1.19E-04" 0.931 95 "MESH SIZE(-28 +60), HAND-PICKED MATERIAL" AGE PROBABLY REDUCED AS A RESULT OF PREHEATING BY LATER PLUTONISM 8113 1 109.9 muscovite conventional K-Ar 61-041 "4.72E-04, 0.584E-04, 1.19E-04" 10.34 93 age of intrusion MESH SIZE(-35 +80) 8114 1 110 biotite conventional K-Ar 61-042 "4.72E-04, 0.584E-04, 1.19E-04" 9.074 87 age of intrusion MESH SIZE(-35 +60) 8115 1 162.6 hornblende conventional K-Ar 61-044 "4.72E-04, 0.584E-04, 1.19E-04" 1.265 85 MESH SIZE(-100 +115) 8116 1 75.8 hornblende conventional K-Ar 61-119 "4.72E-04, 0.584E-04, 1.19E-04" 0.66 68 age not evaluated MESH SIZE(-100 +150) 8117 1 77.2 hornblende conventional K-Ar 61-117 "4.72E-04, 0.584E-04, 1.19E-04" 1.06 70 age not evaluated MESH SIZE(-100 +115) 8118 1 94.2 biotite conventional K-Ar 71-079 "4.72E-04, 0.584E-04, 1.19E-04" 8.941 69 minimum age of intrusion MESH SIZE(-60 +80) 8119 1 95 hornblende conventional K-Ar 71-073 "4.72E-04, 0.584E-04, 1.19E-04" 1.434 48 minimum age of intrusion MESH SIZE(-100 +150) 8120 1 94.1 biotite conventional K-Ar 71-075 "4.72E-04, 0.584E-04, 1.19E-04" 9.495 95 age of intrusion MESH SIZE(-60 +80) 8121 1 94.7 hornblende conventional K-Ar 71-061 "4.72E-04, 0.584E-04, 1.19E-04" 0.715 60 age of intrusion MESH SIZE(-100 +115) 8122 1 101.1 hornblende conventional K-Ar 71-067 "4.72E-04, 0.584E-04, 1.19E-04" 0.662 81 minimum age of intrusion MESH SIZE(-100 +115) 8123 1 91.1 biotite conventional K-Ar 71-083 "4.72E-04, 0.584E-04, 1.19E-04" 9.098 67 MESH SIZE(-60 +80) AGE PROBABLY REDUCED AS A RESULT OF REHEATING BY LATER PLUTONISM 8124 1 101.9 hornblende conventional K-Ar 71-071 "4.72E-04, 0.584E-04, 1.19E-04" 1.01 90 age of intrusion MESH SIZE(-100 +115) 8125 1 98.4 biotite conventional K-Ar 71-081 "4.72E-04, 0.584E-04, 1.19E-04" 9.375 91 minimum age of intrusion MESH SIZE(-60 +80) 8126 1 96.4 hornblende conventional K-Ar 71-063 "4.72E-04, 0.584E-04, 1.19E-04" 0.829 89 age of intrusion MESH SIZE(-100 +115) 8166 1 18.5 0.8 sanidine conventional K-Ar 4. (M75) "4.962E-04, 0.581E-04, 1.1167E-04" 7.35 1.977 76 age of volcanism "K2O=7.38, 7.32%" 8167 1 19.4 0.8 sanidine conventional K-Ar 5. (M74) "4.962E-04, 0.581E-04, 1.1167E-04" 5.645 1.581 81 age of volcanism "K2O=5.62, 5.67%" 8169 1 21.4 0.9 biotite conventional K-Ar 7. (M28) "4.962E-04, 0.581E-04, 1.1167E-04" 5.81 1.806 77 age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION 8170 1 21.6 0.9 biotite conventional K-Ar 8. (M29) "4.962E-04, 0.581E-04, 1.1167E-04" 8.555 2.678 60 minimum age of intrusion "K2O=8.53, 8.58% BY ISOTOPE DILUTION" 8172 1 21.4 1 sanidine conventional K-Ar 10. (M49B) "4.962E-04, 0.581E-04, 1.1167E-04" 6.34 1.967 83 age of volcanism "K2O=6.33, 6.35%" 8172 2 21.6 0.9 sanidine conventional K-Ar 10. (M49B) "4.962E-04, 0.581E-04, 1.1167E-04" 9.625 3.053 90 age of volcanism "K2O=9.70, 9.55%" 8172 3 21.6 1.1 biotite conventional K-Ar 10. (M49B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.945 2.805 62 age of volcanism "K2O=8.94, 8.95%" 8173 1 28.9 1.4 biotite conventional K-Ar 11. (M83) "4.962E-04, 0.581E-04, 1.1167E-04" 8.075 3.385 68 "K2O=8.04, 8.11%" AGE IS TOO OLD 8177 1 26.9 2.2 plagioclase conventional K-Ar 15. (M90) "4.962E-04, 0.581E-04, 1.1167E-04" 0.745 0.292 39 age of volcanism "K2O=0.74, 0.75%" 8177 2 28.9 1.5 plagioclase conventional K-Ar 15. (M90B) "4.962E-04, 0.581E-04, 1.1167E-04" 0.785 0.329 77 "K2O=0.82, 0.75%" AGE IS TOO OLD 8177 3 32.1 1.4 biotite conventional K-Ar 15. (M90) "4.962E-04, 0.581E-04, 1.1167E-04" 5.46 2.542 83 "K2O=5.47, 5.45%" AGE IS TOO OLD 8177 4 30.6 1.3 biotite conventional K-Ar 15. (M90B) "4.962E-04, 0.581E-04, 1.1167E-04" 7.285 3.242 86 "K2O=7.38, 7.19%" AGE IS TOO OLD 8178 1 13.8 0.6 alunite conventional K-Ar 16. (M51A) "4.962E-04, 0.581E-04, 1.1167E-04" 6.73 1.349 66 "K2O=6.73, 6.73%" AGE OF MINERALIZATION 8179 1 14.3 0.6 alunite conventional K-Ar 17. (M51) "4.962E-04, 0.581E-04, 1.1167E-04" 9.135 1.893 62 "K2O=9.10, 9.17%" AGE OF MINERALIZATION 8180 1 16.6 0.8 natroalunite conventional K-Ar 18. (M48) "4.962E-04, 0.581E-04, 1.1167E-04" 4.815 1.155 59 "K2O=4.79, 4.84%" AGE OF MINERALIZATION 8181 1 21.8 4.3 alunite conventional K-Ar 19. (M53) "4.962E-04, 0.581E-04, 1.1167E-04" 7.655 2.424 13 "K2O=7.65, 7.66%" AGE OF MINERALIZATION 8182 1 22.5 1 alunite conventional K-Ar 20. (M47B) "4.962E-04, 0.581E-04, 1.1167E-04" 8.095 2.639 63 "K2O=8.18, 7.99%" AGE OF MINERALIZATION 8183 1 22.7 1.1 alunite conventional K-Ar 21. (M30) "4.962E-04, 0.581E-04, 1.1167E-04" 6.935 2.284 52 "K2O=6.94, 6.93%" AGE OF MINERALIZATION 8184 1 9.4 0.5 alunite conventional K-Ar 22. (M256) "4.962E-04, 0.581E-04, 1.1167E-04" 9.055 1.234 49 "K2O=9.00, 9.11%" AGE OF MINERALIZATION 8185 1 34.1 1 biotite conventional K-Ar TAD-2-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.37 4.24 85 age of intrusion "K=6.945%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR." 8186 1 32.1 0.9 biotite conventional K-Ar TAD-3-67 "4.962E-04, 0.581E-04, 1.1167E-04" 7.22 3.44 63 age of intrusion "K=5.99%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR" 8186 2 38.7 1.9 hornblende conventional K-Ar TAD-3-67 "4.962E-04, 0.581E-04, 1.1167E-04" 1.09 0.631 38 K=0.908% AGE IS TOO OLD; EXCESS ARGON PROBABLY PRESENT 8187 1 31.5 0.9 biotite conventional K-Ar TAD-4-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.47 3.96 75 age of intrusion "K=7.03%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR" 8188 1 32.8 1 biotite conventional K-Ar TAD-6-67 "4.962E-04, 0.581E-04, 1.1167E-04" 7.58 3.69 81 age of volcanism "K=6.29%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR" 8188 2 32.7 1 sanidine conventional K-Ar TAD-6-67 "4.962E-04, 0.581E-04, 1.1167E-04" 10.88 5.29 99 age of volcanism K=9.03% 8189 1 18.3 0.5 sanidine conventional K-Ar TAD-7-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.41 2.27 98 age of volcanism "K=6.98%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR." 8189 2 15.9 2.6 sanidine conventional K-Ar TAD-7-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.41 1.98 12 age meaning uncertain (analysis questionable) K=6.98% 8190 1 17.9 0.5 biotite conventional K-Ar TAD-9-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.04 2.13 55 age of intrusion "K=6.67%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR." 8191 1 27.8 0.8 sanidine conventional K-Ar TAD-11-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.12 2.6 55 age of volcanism "K=6.74%; LAMBDA-BETA=4.78 X E-10/YR, LAMBDA-EPSILON=0.588 X E-10/YR" 8216 1 32.39 1 biotite conventional K-Ar 1. (PC-381) "4.72E-04, 0.584E-04, 1.19E-04*" 8.238 3.876 74 age of intrusion "K2O = 8.22, 8.21 % AND BY ISOTOPE DILUTION K2O = 8.275, 8.239 %" 8216 2 32.44 1 biotite conventional K-Ar 1. (PC-381) "4.72E-04, 0.584E-04, 1.19E-04*" 8.238 3.882 74 age of intrusion "K2O = 8.22, 8.21 % AND BY ISOTOPE DILUTION K2O = 8.275, 8.239 %" 8217 1 32.83 1.2 biotite conventional K-Ar 2. (PC-382) "4.72E-04, 0.584E-04, 1.19E-04*" 8.115 3.871 88 age of intrusion "K2O = 8.10, 8.13 %" 8217 2 42.22 1.9 hornblende conventional K-Ar 2. (PC-382) "4.72E-04, 0.584E-04, 1.19E-04*" 0.7675 0.472 66 "K2O = 0.68, 0.67 % AND BY ISOTOPE DILUTION K2O = 0.682, 0.675 %" THIS AGE IS PROBABLY TOO OLD 8217 3 42.4 2.3 hornblende conventional K-Ar 2. (PC-382) "4.72E-04, 0.584E-04, 1.19E-04*" 0.7675 0.474 63 "K2O = 0.68, 0.67 % AND BY ISOTOPE DILUTION K2O = 0.682, 0.675 %" THIS AGE IS PROBABLY TOO OLD 8218 1 33.86 1.2 biotite conventional K-Ar 3. (PC-380) "4.72E-04, 0.584E-04, 1.19E-04*" 8.225 4.048 85 age of intrusion "K2O = 8.29, 8.22 %" 8219 1 35.61 1.3 biotite conventional K-Ar 4. (PC-25) "4.72E-04, 0.584E-04, 1.19E-04*" 9.045 4.683 85 age of intrusion "K2O = 9.09, 9.00 %" 8220 1 36.1 1.3 biotite conventional K-Ar 5. (PC-27) "4.72E-04, 0.584E-04, 1.19E-04*" 8.005 4.202 85 age of intrusion "K2O = 8.02, 7.99 %" 8221 1 41.23 1.6 hornblende conventional K-Ar 6. (PC-379) "4.72E-04, 0.584E-04, 1.19E-04*" 1.284 0.771 72 "K2O = 1.299, 1.269 % BY ISOTOPE DILUTION" THIS AGE IS PROBABLY TOO OLD 8222 1 35.42 1.6 biotite conventional K-Ar 7. (PC-383) "4.72E-04, 0.584E-04, 1.19E-04*" 4.845 2.495 74 age of intrusion "K2O = 4.86, 4.83 %" 8222 2 40.72 1.2 hornblende conventional K-Ar 7. (PC-383) "4.72E-04, 0.584E-04, 1.19E-04*" 1.27 0.753 80 "K2O = 1.268, 1.272 % BY ISOTOPE DILUTION" THIS AGE APPEARS TOO OLD 8223 1 40.64 1.2 hornblende conventional K-Ar 8. (PC-384) "4.72E-04, 0.584E-04, 1.19E-04*" 1.259 0.745 81 "K2O = 1.30, 1.26 % AND BY ISOTOPE DILUTION K2O = 1.236, 1.241 %" THIS AGE APPEARS TOO OLD 8224 1 38.69 1.5 hornblende conventional K-Ar 9. (PC-12) "4.72E-04, 0.584E-04, 1.19E-04*" 0.824 0.464 73 "K2O = 0.819, 0.829 %" THIS AGE APPEARS TOO OLD 8225 1 76.66 4.8 plagioclase conventional K-Ar 10. (PC-388) "4.72E-04, 0.584E-04, 1.19E-04*" 1.09 1.229 67 "K2O = 1.09, 1.09 %" SPURIOUS AGE 8225 2 78.43 5.1 plagioclase conventional K-Ar 10. (PC-388) "4.72E-04, 0.584E-04, 1.19E-04*" 1.09 1.258 58 "K2O = 1.09, 1.09 %" SPURIOUS AGE 8225 3 42.25 1.6 hornblende conventional K-Ar 10. (PC-388) "4.72E-04, 0.584E-04, 1.19E-04*" 0.8515 0.524 71 "K2O = 0.844, 0.859 %" THIS AGE APPEARS TOO OLD 8226 1 34.23 1.3 biotite conventional K-Ar 11. (PC-392) "4.72E-04, 0.584E-04, 1.19E-04*" 8.855 4.406 78 age of intrusion "K20=8.84, 8.87%" 8226 1 34.23 1.3 biotite conventional K-Ar 11. (PC-392) "4.72E-04, 0.584E-04, 1.19E-04*" 8.855 4.406 78 age of intrusion "K20=8.84, 8.87%" 8227 1 34.86 1.1 biotite conventional K-Ar 12. (PC-393) "4.72E-04, 0.584E-04, 1.19E-04*" 8.833 4.476 79 age of intrusion "K2O = 8.81, 8.88 % AND BY ISOTOPE DILUTION K2O = 8.794, 8.849 %" 8227 2 34.55 1.3 biotite conventional K-Ar 12. (PC-393) "4.72E-04, 0.584E-04, 1.19E-04*" 8.833 4.436 69 age of intrusion "K2O = 8.81, 8.88 % AND BY ISOTOPE DILUTION K2O = 8.794, 8.849 %" 8228 1 35.37 1.4 biotite conventional K-Ar 13. (DDH-37-1490) "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 4.494 69 age of intrusion "K2O = 8.77, 8.71 %" 8229 1 32.93 1.3 biotite conventional K-Ar 14. (2380-1) "4.72E-04, 0.584E-04, 1.19E-04*" 8.718 4.171 55 age of intrusion "K2O = 8.958, 8.477 %" 8230 1 36.48 1.3 plagioclase conventional K-Ar 15. (PC-389) "4.72E-04, 0.584E-04, 1.19E-04*" 5.057 2.683 93 age of intrusion "K2O = 5.03, 5.04 % AND BY ISOTOPE DILUTION K2O = 5.087, 5.070 %" 8230 2 36.53 1.3 plagioclase conventional K-Ar 15. (PC-389) "4.72E-04, 0.584E-04, 1.19E-04*" 5.057 2.687 85 age of intrusion "K2O = 5.03, 5.04 % AND BY ISOTOPE DILUTION K2O = 5.087, 5.070 %" 8231 1 37.32 1.3 hornblende conventional K-Ar 16. (PC-398) "4.72E-04, 0.584E-04, 1.19E-04*" 0.794 0.431 85 maximum age of volcanism "K2O = 0.80 % AND BY ISOTOPE DILUTION K2O = 0.798, 0.785 %" 8231 2 34.68 1.3 biotite conventional K-Ar 16. (PC-398) "4.72E-04, 0.584E-04, 1.19E-04*" 7.5 3.781 82 age of volcanism "K2O = 7.51, 7.49 %" 8232 1 34.68 1.2 biotite conventional K-Ar 17. (PC-387) "4.72E-04, 0.584E-04, 1.19E-04*" 7.92 3.993 85 age of intrusion "K2O = 7.90, 7.94 %" 8232 2 36.03 1 hornblende conventional K-Ar 17. (PC-387) "4.72E-04, 0.584E-04, 1.19E-04*" 1.376 0.721 87 maximum age of intrusion "K2O = 1.375, 1.377 % BY ISOTOPE DILUTION" 8233 1 37.1 1.3 hornblende conventional K-Ar 18. (PC-386) "4.72E-04, 0.584E-04, 1.19E-04*" 1.334 0.72 85 maximum age of intrusion "K2O = 1.338, 1.330 % BY ISOTOPE DILUTION" 8234 1 37.01 1.3 hornblende conventional K-Ar 19. (PC-385) "4.72E-04, 0.584E-04, 1.19E-04*" 1.3505 0.727 88 maximum age of intrusion "K2O = 1.365, 1.336 % BY ISOTOPE DILUTION" 8235 1 35.41 1.3 phlogopite conventional K-Ar 20. (2207) "4.72E-04, 0.584E-04, 1.19E-04*" 9.88 5.087 80 "K2O = 9.92, 9.84 %" APPROXIMATE TIME OF MINERALIZATION 8236 1 35.93 1.3 sericite conventional K-Ar 21. (DDH-0-2404) "4.72E-04, 0.584E-04, 1.19E-04*" 9.535 4.982 83 "K2O = 9.53, 9.54 %" APPROXIMATE TIME OF MINERALIZATION 8237 1 35.21 1.5 muscovite conventional K-Ar 22. (1918 DRE) "4.72E-04, 0.584E-04, 1.19E-04*" 9.22 4.72 58 "K2O = 9.25, 9.19 %" APPROXIMATE TIME OF MINERALIZATION 8238 1 34.07 1.3 biotite conventional K-Ar 23. (PC-396) "4.72E-04, 0.584E-04, 1.19E-04*" 8.265 4.093 78 SECONDARY BIOTITE "K2O = 8.24, 8.29 %" APPROXIMATE TIME OF MINERALIZATION 8239 1 33.91 1.3 biotite conventional K-Ar 24. (PC-394) "4.72E-04, 0.584E-04, 1.19E-04*" 8.625 4.25 71 SECONDARY BIOTITE "K2O = 8.59, 8.66 %" APPROXIMATE TIME OF MINERALIZATION 8240 1 35.41 1.3 phlogopite conventional K-Ar 25. (2207-1) "4.72E-04, 0.584E-04, 1.19E-04*" 10.204 5.254 63 "K2O = 10.160, 10.247 %" APPROXIMATE TIME OF MINERALIZATION 8241 1 39.21 1.4 phlogopite conventional K-Ar 26. (2220-2) "4.72E-04, 0.584E-04, 1.19E-04*" 9.874 5.635 41 age not evaluated "K2O = 9.658, 10.089 %" 8242 1 21.45 biotite conventional K-Ar 1. USGS-(M)61-285 "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 2.725 78 age of intrusion "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 242, P. 28." 8243 1 22.18 anorthoclase conventional K-Ar 2. USGS-(M)64-48 "4.72E-04, 0.585E-04, 1.19E-04*" 4.09 1.314 81 minimum age of volcanism 8244 1 21.35 plagioclase conventional K-Ar 3. USGS-(M)65-136 "4.72E-04, 0.585E-04, 1.19E-04*" 1.98 0.6122 66 minimum age of volcanism 8244 2 23.01 biotite conventional K-Ar USGS-(M)65-136 "4.72E-04, 0.585E-04, 1.19E-04*" 7.6 2.534 80 age of volcanism 8245 1 23 biotite conventional K-Ar 4. USGS-(M)63-16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 2.919 80 age of volcanism "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 245, P. 29" 8246 1 22.49 sanidine conventional K-Ar 5. USGS-(M)61-284 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 2.952 95 age of volcanism "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 244, P.29." 8247 1 21.35 biotite conventional K-Ar 6. USGS-(M)61-282 "4.72E-04, 0.585E-04, 1.19E-04*" 8.15 2.52 75 "THIS IS PROBABLY A REDUCED AGE. SEE MARVIN AND DOBSON, 1979, ENTRY NO. 240, P.28." 8247 2 27.69 hornblende conventional K-Ar 6. USGS-(M)61-282 "4.72E-04, 0.585E-04, 1.19E-04*" 0.35 0.1406 34 age of intrusion "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 240, P. 28." 8248 1 28.76 biotite conventional K-Ar 7. USGS-(M)63-17 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 3.706 86 age of intrusion "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 243, P. 28." 8249 1 29.11 hornblende conventional K-Ar 8. USGS-(M)61-283 "4.72E-04, 0.585E-04, 1.19E-04*" 0.36 0.1521 34 age of intrusion "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 241, P. 28." 8250 1 30.03 biotite conventional K-Ar 9. USGS-(M)61-85 "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 3.775 79 age of volcanism "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 246, P. 29." 8250 2 29.97 hornblende conventional K-Ar 9. USGS-(M)61-85 "4.72E-04, 0.585E-04, 1.19E-04*" 0.91 0.3959 66 age of volcanism "SEE MARVIN AND DOBSON, 1979, ENTRY NO. 246, P. 29." 8251 1 31.6 plagioclase conventional K-Ar 10. USGS-(M)65-106 "4.72E-04, 0.585E-04, 1.19E-04*" 0.712 0.3265 74 minimum age of volcanism 8251 2 34.9 hornblende conventional K-Ar 10. USGS-(M)65-106 "4.72E-04, 0.585E-04, 1.19E-04*" 0.916 0.4651 54 age of volcanism 8252 1 33.1 hornblende conventional K-Ar 11. USGS-(M)65-100 "4.72E-04, 0.585E-04, 1.19E-04*" 0.75 0.3612 58 age of volcanism 8253 1 33.8 plagioclase conventional K-Ar 12. USGS-(M)65-13 "4.72E-04, 0.585E-04, 1.19E-04*" 1.09 0.535 73 age of volcanism 8254 1 34.4 biotite conventional K-Ar 13. USGS-(M)71-44 "4.72E-04, 0.585E-04, 1.19E-04*" 5.6 2.8 78 age of volcanism 8255 1 18.11 1 biotite conventional K-Ar AK91 "4.76E-04, 0.589E-04, 1.18E-04*" 6.83 1.79 52 age of intrusion "K = 5.67 %; DATA FROM ENGELS AND OTHERS, 1976" 8257 1 22.3 biotite conventional K-Ar KA2 "4.83E-04, 0.585E-04" 9.37 43 K = 7.78 % (AVERAGE OF REPLICATE ANALYSES) INTRUSIVE MAY BE ABOUT 24 M.Y. OLD. 8257 2 27.2 biotite conventional K-Ar KA2 "4.83E-04, 0.585E-04" 9.37 36 K =7.78 % (AVERAGE OF REPLICATE ANALYSES) INTRUSIVE MAY BE ABOUT 24 M.Y. OLD. 8257 3 21.3 biotite conventional K-Ar KA2 "4.83E-04, 0.585E-04" 8.79 73 K = 7.30 % (AVERAGE OF REPLICATE ANALYSES) INTRUSIVE MAY BE ABOUT 24 M.Y. OLD. 8258 1 31.1 sanidine conventional K-Ar KA7 "4.83E-04, 0.585E-04" 6.75 90 K = 5.60 % AGE APPEARS TOO OLD 8258 2 28 biotite conventional K-Ar KA7 "4.83E-04, 0.585E-04" 6.75 64 maximum age of volcanism K = 5.60 % 8259 1 27 biotite conventional K-Ar KA11 "4.83E-04, 0.585E-04" 8.97 40 BIOTITE IS ALTERED K=7.45% (AVERAGE OF REPLICATE ANALYSES) AGE APPEARS TOO OLD 8259 2 25.1 biotite conventional K-Ar KA11 "4.83E-04, 0.585E-04" 8.55 69 K=7.10% (AVERAGE OF REPLICATE ANALYSES) AGE APPEARS TOO OLD 8260 1 11.5 glass conventional K-Ar KA12G "4.83E-04, 0.585E-04" 3.57 65 K = 2.96 % AGE IS TOO YOUNG 8260 2 16 glass conventional K-Ar KA12G "4.83E-04, 0.585E-04" 3.57 23 K = 2.96 % AGE IS TOO YOUNG 8260 3 15 glass conventional K-Ar KA12G "4.83E-04, 0.585E-04" 3.57 70 K = 2.96 % AGE IS TOO YOUNG 8260 4 21.7 biotite conventional K-Ar KA12B "4.83E-04, 0.585E-04" 7.26 63 age of intrusion K = 6.03 % (AVERAGE OF REPLICATE ANALYSES) 8260 5 19.1 biotite conventional K-Ar KA12B "4.83E-04, 0.585E-04" 8.52 56 minimum age of intrusion K = 7.07 % (AVERAGE OF REPLICATE ANALYSES) 8261 1 22.2 biotite conventional K-Ar KA12B "4.83E-04, 0.585E-04" 8.52 52 age of intrusion K = 7.07 % (AVERAGE OF REPLICATE ANALYSES) 8261 2 24.7 biotite conventional K-Ar KA12B "4.83E-04, 0.585E-04" 8.52 45 K = 7.07 % (AVERAGE OF REPLICATE ANALYSES) AGE APPEARS TOO OLD 8262 1 18.4 glass conventional K-Ar KA14 "4.83E-04, 0.585E-04" 4.7 64 minimum age of volcanism K = 3.90 % 8262 2 17.2 glass conventional K-Ar KA14 "4.83E-04, 0.585E-04" 4.7 58 minimum age of volcanism K2O = 3.90 % 8263 1 22 glass conventional K-Ar KA15 "4.83E-04, 0.585E-04" 4.06 58 age of volcanism K = 3.37 % KA15 8263 2 16 Unk conventional K-Ar GLASS "4.83E-04, 0.585E-04" 4.06 38 K2O = 3.37 % AGE APPEARS TOO YOUNG 8264 1 23.3 biotite conventional K-Ar KA17 "4.83E-04, 0.585E-04" 6.81 40 K = 5.65 % INTRUSIVE MAY BE ABOUT 49 M.Y. OLD. 8264 2 25.3 biotite conventional K-Ar KA17 "4.83E-04, 0.585E-04" 6.75 38 K = 5.65 % INTRUSIVE MAY BE ABOUT 49 M.Y. OLD. 8265 1 19.6 glass conventional K-Ar KA20G "4.83E-04, 0.585E-04" 4.28 48 K = 3.55 % AGE OF ROCK IS PROBABLY ABOUT 20 M.Y. 8265 2 21.8 10 glass conventional K-Ar KA20G "4.83E-04, 0.585E-04" 4.28 85 K = 3.55 % AGE OF ROCK IS PROBABLY ABOUT 20 M.Y. 8265 3 24.6 glass conventional K-Ar KA20G "4.83E-04, 0.585E-04" 4.28 83 K = 3.55 % AGE OF ROCKS IS PROBABLY ABOUT 20 M.Y. 8265 4 16 biotite conventional K-Ar KA20B "4.83E-04, 0.585E-04" 7.35 63 K = 6.10 % AGE OF ROCKS IS PROBABLY ABOUT 20 M.Y. 8265 5 23.3 biotite conventional K-Ar KA20B "4.83E-04, 0.585E-04" 7.35 46 K = 6.10 % AGE OF ROCKS IS PROBABLY ABOUT 20 M.Y. 8266 1 20 glass conventional K-Ar KA28 "4.83E-04, 0.585E-04" 5.01 32 minimum age of volcanism K = 4.16 %R 8266 2 19 glass conventional K-Ar KA28 "4.83E-04, 0.585E-04" 5.01 56 minimum age of volcanism K = 4.16 % 8267 1 20 glass conventional K-Ar KA28 "4.83E-04, 0.585E-04" 5.11 80 minimum age of volcanism K = 4.24 % 8268 1 16.5 glass conventional K-Ar KA31 "4.83E-04, 0.585E-04" 3.45 41 K = 2.86 % AGE APPEARS TOO YOUNG 8268 2 14.8 glass conventional K-Ar KA31 "4.83E-04, 0.585E-04" 3.45 35 K = 2.86 % AGE APPEARS TOO YOUNG 8269 1 12 glass conventional K-Ar KA34 "4.83E-04, 0.585E-04" 5.1 55 K = 4.23 % AGE APPEARS TOO YOUNG 8269 2 15.2 glass conventional K-Ar KA34 "4.83E-04, 0.585E-04" 5.1 23 K2O = 4.23 % AGE APPEARS TOO YOUNG 8269 3 14 glass conventional K-Ar KA34 "4.83E-04, 0.585E-04" 5.1 18 K2O = 4.23 % AGE APPEARS TOO YOUNG 8270 1 12.8 sericite conventional K-Ar KA60 "4.83E-04, 0.585E-04" 9.72 83 X-RAY DIFFRACTION SHOWS WELL-CRYSTALLIZED MICA K = 8.07 % AGE OF MINERALIZATION IS ABOUT 13.5 M.Y. 8270 2 14.2 sericite conventional K-Ar KA60 "4.83E-04, 0.585E-04" 9.72 58 K = 8.07 % AGE OF MINERALIZATION IS ABOUT 13.5 M.Y. 8271 1 40.1 1.3 whole rock conventional K-Ar 0A "4.72E-04, 0.585E-04, 1.19E-04*" 0.525 0.3062 26 60-100 MESH MATERIAL METAMORPHISM OCCURRED AROUND 29 M.Y. AG0 8271 2 29.8 0.7 whole rock conventional K-Ar 0B "4.72E-04, 0.585E-04, 1.19E-04*" 0.74 0.32 30 age of metamorphic crystallization -100 MESH MATERIAL 8272 1 37.15 0.9 whole rock conventional K-Ar 1A "4.72E-04, 0.585E-04, 1.19E-04*" 1.531 0.8274 45 60-100 MESH MATERIAL METAMORPHISM OCCURRED AROUND 29 M.Y. AG0 8272 2 29.88 0.5 whole rock conventional K-Ar 1B "4.72E-04, 0.585E-04, 1.19E-04*" 1.76 0.7634 62 age of metamorphic crystallization -100 MESH MATERIAL 8273 1 36.06 0.7 whole rock conventional K-Ar 2A "4.72E-04, 0.585E-04, 1.19E-04*" 2.056 1.078 68 60-100 MESH MATERIAL METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8273 2 31.96 0.6 whole rock conventional K-Ar 2B "4.72E-04, 0.585E-04, 1.19E-04*" 2.13 0.9887 51 maximum age of metamorphic crystallization -100 MESH MATERIAL 8274 1 39.58 0.8 whole rock conventional K-Ar 3A "4.72E-04, 0.585E-04, 1.19E-04*" 2.005 1.155 46 60-100 MESH MATERIAL METAMORPHISM OCCURRED AROUND 29 M.Y. AG0 8274 2 37.52 whole rock conventional K-Ar 3B "4.72E-04, 0.585E-04, 1.19E-04*" 2.03 1.108 39 -100 MESH MATERIAL METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8274 3 38.49 whole rock conventional K-Ar 3BR "4.72E-04, 0.585E-04, 1.19E-04*" 2.03 1.137 76 -100 MESH MATERIAL METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8275 1 43.08 1 whole rock conventional K-Ar 4A "4.72E-04, 0.585E-04, 1.19E-04*" 2.235 1.403 82 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8275 2 37.98 0.5 whole rock conventional K-Ar 4B "4.72E-04, 0.585E-04, 1.19E-04*" 2.208 1.22 77 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8276 1 42.69 0.8 whole rock conventional K-Ar 5A "4.72E-04, 0.585E-04, 1.19E-04*" 2.336 1.453 69 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8276 2 39.97 0.7 whole rock conventional K-Ar 5B "4.72E-04, 0.585E-04, 1.19E-04*" 2.925 1.702 67 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8277 1 49.61 1 whole rock conventional K-Ar 6A "4.72E-04, 0.585E-04, 1.19E-04*" 2.335 1.691 75 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8277 2 46.42 0.8 whole rock conventional K-Ar 6B "4.72E-04, 0.585E-04, 1.19E-04*" 2.375 1.608 48 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8278 1 53.34 1.2 whole rock conventional K-Ar 7A "4.72E-04, 0.585E-04, 1.19E-04*" 2.262 1.763 72 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8278 2 52.12 0.9 whole rock conventional K-Ar 7B "4.72E-04, 0.585E-04, 1.19E-04*" 2.845 2.166 64 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8279 1 66.02 whole rock conventional K-Ar 8A "4.72E-04, 0.585E-04, 1.19E-04*" 2.13 2.062 62 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8279 2 66.52 whole rock conventional K-Ar 8AR1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.13 2.078 63 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8279 3 68.6 whole rock conventional K-Ar 8AR2 "4.72E-04, 0.585E-04, 1.19E-04*" 2.112 2.126 86 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8279 4 67.85 1.3 whole rock conventional K-Ar 8AR3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.965 1.956 65 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8279 5 56.04 1 whole rock conventional K-Ar 8B "4.72E-04, 0.585E-04, 1.19E-04*" 2.78 2.278 72 AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8280 1 75.96 1.5 whole rock conventional K-Ar 9A "4.72E-04, 0.585E-04, 1.19E-04*" 1.65 1.843 77 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8280 2 64.26 1.1 whole rock conventional K-Ar 9B "4.72E-04, 0.585E-04, 1.19E-04*" 1.79 1.686 73 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8281 1 70.21 1.4 whole rock conventional K-Ar 10A "4.72E-04, 0.585E-04, 1.19E-04*" 1.04 1.072 67 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8281 2 68.99 whole rock conventional K-Ar 10B "4.72E-04, 0.585E-04, 1.19E-04*" 1.444 1.462 58 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8281 3 71.07 whole rock conventional K-Ar 10BR1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.444 1.507 79 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8281 4 69.55 whole rock conventional K-Ar 10BR2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.436 1.466 51 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8282 1 88.4 whole rock conventional K-Ar 11A "4.72E-04, 0.585E-04, 1.19E-04*" 1.58 2.061 62 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8282 2 88.24 whole rock conventional K-Ar 11AR1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.444 1.88 62 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8282 3 85.52 whole rock conventional K-Ar 11AR2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.453 1.832 68 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8282 4 76.87 1.3 whole rock conventional K-Ar 11B "4.72E-04, 0.585E-04, 1.19E-04*" 2.005 2.267 68 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8282 5 74.36 3 whole rock conventional K-Ar 11BR "4.72E-04, 0.585E-04, 1.19E-04*" 2.065 2.257 16 LOW RADIOGENIC ARGON VALUE DUE TO A LEAK ON MASS SPECTROMETER AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8283 1 105.27 2.1 whole rock conventional K-Ar 12A "4.72E-04, 0.585E-04, 1.19E-04*" 1.411 2.202 79 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8283 2 93.3 1.6 whole rock conventional K-Ar 12B "4.72E-04, 0.585E-04, 1.19E-04*" 2.068 2.851 70 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8284 1 108.67 whole rock conventional K-Ar 13A "4.72E-04, 0.585E-04, 1.19E-04*" 1.355 2.185 50 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8284 2 108.95 whole rock conventional K-Ar 13AR1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.352 2.186 72 60-100 MESH MATERIAL; CLASTIC GRAINS PREDOMINATE AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8284 3 105.88 2.1 whole rock conventional K-Ar 13AR2 "4.72E-04, 0.585E-04, 1.19E-04*" 1.323 2.077 74 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8284 4 95.37 1.7 whole rock conventional K-Ar 13B "4.72E-04, 0.585E-04, 1.19E-04*" 1.615 2.277 75 -100 MESH MATERIAL; MAINLY VERY FINE-GRAINED MATRIX AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8285 1 28.17 whole rock conventional K-Ar 14A "4.72E-04, 0.585E-04, 1.19E-04*" 2.432 0.9941 75 age of metamorphic crystallization 60-100 MESH MATERIAL 8285 2 27.65 whole rock conventional K-Ar 14B "4.72E-04, 0.585E-04, 1.19E-04*" 2.6 1.043 70 age of metamorphic crystallization -100 MESH MATERIAL 8286 1 31.12 whole rock conventional K-Ar 15A "4.72E-04, 0.585E-04, 1.19E-04*" 2.295 1.037 52 age of metamorphic crystallization 60-100 MESH MATERIAL 8286 2 30.96 whole rock conventional K-Ar 15B "4.72E-04, 0.585E-04, 1.19E-04*" 2.342 1.053 52 age of metamorphic crystallization -100 MESH MATERIAL 8287 1 48.18 whole rock conventional K-Ar 16A "4.72E-04, 0.585E-04, 1.19E-04*" 2.495 1.754 57 60-100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8287 2 47.9 whole rock conventional K-Ar 16B "4.72E-04, 0.585E-04, 1.19E-04*" 2.57 1.796 51 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8288 1 56.5 whole rock conventional K-Ar 17A "4.72E-04, 0.585E-04, 1.19E-04*" 1.29 1.066 76 60-100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8288 2 55.04 whole rock conventional K-Ar 17B "4.72E-04, 0.585E-04, 1.19E-04*" 1.361 1.095 72 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8289 1 69.27 whole rock conventional K-Ar 18A "4.72E-04, 0.585E-04, 1.19E-04*" 2.76 2.806 67 60 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8289 2 67.8 whole rock conventional K-Ar 18B "4.72E-04, 0.585E-04, 1.19E-04*" 2.83 2.815 78 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8290 1 78.78 whole rock conventional K-Ar 19A "4.72E-04, 0.585E-04, 1.19E-04*" 5.04 5.843 88 60-100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8290 2 80.01 whole rock conventional K-Ar 19B "4.72E-04, 0.585E-04, 1.19E-04*" 4.95 5.83 74 AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8291 1 102.67 whole rock conventional K-Ar 20A "4.72E-04, 0.585E-04, 1.19E-04*" 2.775 4.221 91 60-100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8291 2 102.47 whole rock conventional K-Ar 20B "4.72E-04, 0.585E-04, 1.19E-04*" 2.85 4.326 81 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8292 1 232.46 whole rock conventional K-Ar 21A "4.72E-04, 0.585E-04, 1.19E-04*" 3.855 13.77 95 60-100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8292 2 230.56 whole rock conventional K-Ar 21AR "4.72E-04, 0.585E-04, 1.19E-04*" 3.855 13.65 95 60-100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8292 3 232.36 whole rock conventional K-Ar 21B "4.72E-04, 0.585E-04, 1.19E-04*" 3.77 13.46 94 -100 MESH MATERIAL AGE DOES NOT DATE ANY EVENT; METAMORPHISM OCCURRED AROUND 29 M.Y. AGO. 8293 1 16.87 whole rock conventional K-Ar 22A "4.72E-04, 0.585E-04, 1.19E-04*" 3.65 0.8905 45 60-100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8293 2 18.35 whole rock conventional K-Ar 22AR1 "4.72E-04, 0.585E-04, 1.19E-04*" 3.65 0.9694 42 60-100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8293 3 18.53 whole rock conventional K-Ar 22AR2 "4.72E-04, 0.585E-04, 1.19E-04*" 3.07 0.8234 63 60-100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8293 4 17.28 1.2 whole rock conventional K-Ar 22B "4.72E-04, 0.585E-04, 1.19E-04*" 3.205 0.801 44 -100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8294 1 17.9 1.2 whole rock conventional K-Ar 23A "4.72E-04, 0.585E-04, 1.19E-04*" 4.15 1.075 22 60-100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8294 2 17.2 1.2 whole rock conventional K-Ar 23B "4.72E-04, 0.585E-04, 1.19E-04*" 3.555 0.8844 63 -100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8295 1 17.13 1.2 whole rock conventional K-Ar 24A "4.72E-04, 0.585E-04, 1.19E-04*" 3.14 0.7783 78 60-100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8295 2 17.27 1.2 whole rock conventional K-Ar 24B "4.72E-04, 0.585E-04, 1.19E-04*" 3.05 0.7619 68 -100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8296 1 17.83 1 whole rock conventional K-Ar 25A "4.72E-04, 0.585E-04, 1.19E-04*" 3.195 0.8242 52 60-100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8296 2 20.39 1.4 whole rock conventional K-Ar 25B "4.72E-04, 0.585E-04, 1.19E-04*" 2.97 0.8767 37 -100 MESH MATERIAL APPROXIMATE AGE OF FAULTING AND MINERALIZATION 8297 1 9 1.4 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8298 1 16 0.65 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 8322 1 0.6 0.1 glass conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 4.01 0.0344 10 age of volcanism 8323 1 0.76 0.7 plagioclase conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.501 0.0055 0 age of volcanism 8324 1 0.8 0.2 glass conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 3.69 0.0428 7 age of volcanism 8325 1 0.87 0.04 glass conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 3.84 0.0482 23 age of volcanism 8326 1 1.13 0.05 glass conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 3.835 0.0627 36 age of volcanism "K2O=3.83, 3.84%" 8327 1 2.36 0.32 sanidine conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 7.385 0.2508 16 age of volcanism "K2O=7.34, 7.43%" 8328 1 2.51 0.94 plagioclase conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.385 0.0139 5 age of volcanism 8329 1 3.44 0.44 glass conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.1797 16 age of volcanism 8329 1 3.44 0.44 glass conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.1797 16 age of volcanism 8330 1 3.69 0.07 glass conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 3.98 0.2116 54 age of volcanism 8331 1 4.42 0.34 glass conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 3.715 0.2369 25 age of volcanism "K2O=3.72, 3.71%" 8332 1 4.55 0.18 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 6.81 0.4466 40 age of volcanism 8333 1 4.59 0.84 plagioclase conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.598 0.0396 12 age of volcanism 8334 1 4.79 0.17 whole rock conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 2.414 0.1668 37 age of volcanism 8335 1 5.04 0.73 glass conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 4.18 0.3038 17 age of volcanism "K2O=4.21, 4.15%" 8336 1 5.02 0.59 plagioclase conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.826 0.0597 20 age of volcanism 8337 1 5.15 0.2 whole rock conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 3.77 0.2798 40 age of volcanism 8338 1 5.27 0.08 glass conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 4.22 0.3209 61 age of volcanism 8339 1 5.21 0.64 plagioclase conventional K-Ar "4.72E-04, 0.585E-04, 1.19E-04*" 0.862 0.0647 16 age of volcanism 8340 1 5.52 0.54 plagioclase conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 0.93 0.0741 18 age of volcanism 8341 1 5.85 0.67 glass conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 5.046 0.4258 75 age of volcanism 8342 1 6.06 0.09 glass conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 4.06 0.3547 61 age of volcanism 8343 1 6.34 0.63 whole rock conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.3322 22 age of volcanism 8344 1 6.57 0.19 glass conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 4.93 0.4672 45 age of volcanism 8345 1 6.85 0.18 biotite conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 0.8641 48 age of volcanism 8346 1 7.02 0.22 sanidine conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 6.51 0.6589 45 age of volcanism "K2O=6.50, 6.52%" 8347 1 6.95 1.1 plagioclase conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 0.404 0.0405 12 age of volcanism 8348 1 7.1 0.14 glass conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 4.405 0.451 68 age of volcanism "K2O=4.38, 4.43%" 8349 1 7.3 0.94 biotite conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 6.55 0.6896 15 age of volcanism 8350 1 7.32 0.34 glass conventional K-Ar 29 "4.72E-04, 0.585E-04, 1.19E-04*" 4.425 0.4676 32 age of volcanism "K2O=4.42, 4.43%" 8351 1 7.38 0.32 sanidine conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 11.69 1.2449 40 age of volcanism 8352 1 7.36 1.54 plagioclase conventional K-Ar 31 "4.72E-04, 0.585E-04, 1.19E-04*" 0.335 0.0356 11 age of volcanism 8353 1 7.46 0.5 biotite conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 0.8605 26 age of volcanism 8354 1 7.61 0.19 glass conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 4.42 0.4854 55 age of volcanism 8355 1 7.74 0.1 glass conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 5.43 0.6065 72 age of volcanism 8356 1 7.91 0.09 glass conventional K-Ar 35 "4.72E-04, 0.585E-04, 1.19E-04*" 4.515 0.5152 76 age of volcanism "K2O=4.47, 4.56%" 8357 1 8.07 0.21 sanidine conventional K-Ar 36 "4.72E-04, 0.585E-04, 1.19E-04*" 7.68 0.8938 54 age of volcanism "K20=7.75, 7.61%" 8358 1 10.63 0.53 glass conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 4.81 0.7386 37 age of volcanism 8359 1 13.83 0.23 sanidine conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 7.26 1.4513 65 age of volcanism 8360 1 15.12 0.5 sanidine conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 7.94 1.736 50 age of volcanism 8361 1 15.09 1.1 plagioclase conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 0.584 0.1274 29 age of volcanism 8362 1 49.17 1.7 muscovite conventional K-Ar RWT20-68 "4.72E-04, 0.585E-04, 1.19E-04*" 9.895 7.101 56 age of intrusion "97% PURE WITH MINOR CHLORITE, QUARTZ, BIOTITE, EPIDOTE; 60-140 MESH" 8362 2 48.85 1.4 biotite conventional K-Ar RWT20-68 "4.72E-04, 0.585E-04, 1.19E-04*" 7.95 5.668 85 age of intrusion 96% PURE WITH MINOR CHLORITE; 60-140 MESH 8363 1 44.4 1.4 hornblende conventional K-Ar RWT12-68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.655 0.4242 40 age of intrusion "GREEN-BROWN-COLORLESS HORNBLENDE, 60-140 MESH" 8364 1 35.08 1.8 hornblende conventional K-Ar PM32 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9115 0.4648 69 age of intrusion 90% PURE WITH 8% BIOTITE AND 2% CHLORITE AND EPIDOTE 8364 2 35.14 1.4 biotite conventional K-Ar PM32 "4.72E-04, 0.585E-04, 1.19E-04*" 7.79 3.98 59 age of intrusion "5-10% IMPURITIES (HORNBLENDE, ECT.); 40-60 MESH" 8365 1 32.88 2.5 hornblende conventional K-Ar JE10-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3655 0.1746 19 age of intrusion "95% PURE, 60-140 MESH" 8365 2 33.35 1.2 biotite conventional K-Ar JE10-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.605 4.17 53 age of intrusion "98% PURE, 60-140 MESH" 8366 1 25.65 1.5 hornblende conventional K-Ar RWT16-68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9188 0.3417 29 age of intrusion "99% PURE WITH CHLORITE AND COLORLESS AMPHIBOLE, 100-140 MESH" 8366 2 27.25 0.8 biotite conventional K-Ar RWT16-68 "4.72E-04, 0.585E-04, 1.19E-04*" 8.605 3.401 80 age of intrusion "99% PURE, 100-140 MESH" 8367 1 24.48 1 hornblende conventional K-Ar RWT13-68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5655 0.2007 45 age of intrusion "99% PURE, 60-100 MESH" 8367 2 24.81 1.1 biotite conventional K-Ar RWT13-68 "4.72E-04, 0.585E-04, 1.19E-04*" 8.532 3.068 68 age of intrusion MINOR AMOUNT OF CHLORITE 8368 1 2.72 0.3 whole rock conventional K-Ar 1. (YU-DP-14) "4.72E-04, 0.584E-04, 1.19E-04*" 0.291 0.0114 75 age of volcanism "K=0.244, 0.239%; RAD40AR=0.0280, 0.0229XE-6 CC/GM" 8369 1 2.86 0.2 whole rock conventional K-Ar 2. (YU-DP-41) "4.72E-04, 0.584E-04, 1.19E-04*" 0.797 0.0329 96 age of volcanism "K=0.655, 0.669%; RAD40AR=0.0709, 0.0766XE-6 CC/GM" 8370 1 8.45 0.12 whole rock conventional K-Ar 3. (YU-DP-119) "4.72E-04, 0.584E-04, 1.19E-04*" 4.56 0.556 5947 minimum age of volcanism "K=3.78, 3.79%; RAD40AR=1.26, 1.23XE-6 CC/GM" 8371 1 8.62 1.3 whole rock conventional K-Ar 4. (YU-DP-146) "4.72E-04, 0.584E-04, 1.19E-04*" 5.13 0.638 45 minimum age of volcanism "K=4.26, 4.26%; RAD40AR=1.41, 1.45XE-6 CC/GM" 8372 1 2.13 0.24 whole rock conventional K-Ar 5. (YU-DP-158) "4.72E-04, 0.584E-04, 1.19E-04*" 4.46 0.137 9 minimum age of volcanism "K=3.75, 3.66%; RAD40AR=0.307XE-6 CC/GM" 8372 2 2.73 0.4 biotite conventional K-Ar 5. (YU-DP-158) "4.72E-04, 0.584E-04, 1.19E-04*" 6.46 0.254 7 age of volcanism "K=5.35, 5.38%; RAD40AR=0.569XE-6 CC/GM" 8373 1 6.15 0.8 whole rock conventional K-Ar 6.(YU-DP-160) "4.72E-04, 0.584E-04, 1.19E-04*" 2.13 0.189 86 age of volcanism "K=1.79, 1.74%; RAD40AR=0.4652, 0.3826XE-6 CC/GM" 8374 1 5.73 0.4 whole rock conventional K-Ar 7. (YU-DP-214) "4.72E-04, 0.584E-04, 1.19E-04*" 4.9 0.405 16 "K=4.06, 4.07%; RAD40AR=0.907XE-6 CC/GM" AGE APPEARS TOO LOW. 8374 2 6.53 0.2 biotite conventional K-Ar 7. (YU-DP-214) "4.72E-04, 0.584E-04, 1.19E-04*" 8.31 0.783 35 age of volcanism "K=6.82, 6.97%; RAD40AR=1.755XE-6 CC/GM" 8375 1 7.25 0.1 sanidine conventional K-Ar 8. (YU-DP-243) "4.72E-04, 0.584E-04, 1.19E-04*" 7.85 0.8215 5955 age of volcanism "K=6.53, 6.51%; RAD40AR=1.837, 1.845XE-6 CC/GM" 8376 1 8.09 0.9 whole rock conventional K-Ar 9.(YU-DP-250) "4.72E-04, 0.584E-04, 1.19E-04*" 0.352 0.0411 8 age of volcanism "K=0.289, 0.293, 0.294%; RAD40AR=0.0922XE-6 CC/GM" 8377 1 9.05 1.4 whole rock conventional K-Ar 10(YU-DP-300) "4.72E-04, 0.584E-04, 1.19E-04*" 0.415 0.0542 45 age of volcanism "K=0.341, 0.348%; RAD40AR=0.124, 0.119XE-6 CC/GM" 8378 1 9.08 0.2 whole rock conventional K-Ar 11.(YU-DP-311B) "4.72E-04, 0.584E-04, 1.19E-04*" 4.51 0.591 428 minimum age of volcanism "K=3.73, 3.76%; RAD40=1.26, 1.39XE-6 CC/GM" 8379 1 6.82 0.2 whole rock conventional K-Ar 12 (YU-DP-311G) "4.72E-04, 0.584E-04, 1.19E-04*" 4.93 0.4852 2621 minimum age of volcanism "K=4.09, 4.09%; RAD40AR=1.092, 1.083XE-6 CC/GM" 8380 1 8.05 whole rock conventional K-Ar 13 (YU-DP-316D) "4.72E-04, 0.584E-04, 1.19E-04*" 4.915 0.571 16 minimum age of volcanism "K=4.13, 4.03%; RAD40AR=1.28XE-6 CC/GM" 8381 1 6.85 0.4 whole rock conventional K-Ar 14(YU-DP-330) "4.72E-04, 0.584E-04, 1.19E-04*" 4.86 0.48 1011 minimum age of volcanism "K=4.04, 4.03%; RAD40AR=1.044, 1.106XE-6 CC/GM" 8382 1 6.75 0.2 anorthoclase conventional K-Ar 15(YU-E-84-67) "4.72E-04, 0.584E-04, 1.19E-04*" 5.32 0.518 29 minimum age of volcanism "K=4.41, 4.43%; RAD40AR=1.161XE-6 CC/GM" 8383 1 6.59 0.2 anorthoclase conventional K-Ar 16(YU-E-6-70) "4.72E-04, 0.584E-04, 1.19E-04*" 4.63 0.44 28 minimum age of volcanism "K=3.85, 3.83%; RAD40AR=0.985XE-6 CC/GM" 8384 1 6.61 0.1 anorthoclase conventional K-Ar 17(YU-COTTONWOOD) "4.72E-04, 0.584E-04, 1.19E-04*" 4.52 0.431 56 minimum age of volcanism "K=3.76, 3.75%; RAD40AR=0.965XE-6 CC/GM" 8387 1 430 15 hornblende conventional K-Ar 528IIHB "4.962E-04, 0.581E-04, 1.1167E-04" 0.31 2.094 73 minimum age of metamorphic crystallization 100% HORNBLENDE CONCENTRATE "K20=0.300, 0.320%" 8388 1 354 10 hornblende conventional K-Ar 693IIHB "4.962E-04, 0.581E-04, 1.1167E-04" 0.578 3.254 78 98.5% HORNBLENDE CONCENTRATE PROBABLY A COOLING AGE 8389 1 322 15 hornblende conventional K-Ar 914HB "4.962E-04, 0.581E-04, 1.1167E-04" 0.228 1.156 63 PROBABLY A COOLING AGE 8390 1 561 15 hornblende conventional K-Ar 26-1210HB "4.962E-04, 0.581E-04, 1.1167E-04" 0.4485 4.199 77 100% HORNBLENDE CONCENTRATE "AGE IS TOO OLD, PROBABLY DUE TO PRESENCE OF EXCESS ARGON." 8391 1 868 25 hornblende conventional K-Ar 261HB "4.962E-04, 0.581E-04, 1.1167E-04" 0.3 4.81 83 98.5% HORNBLENDE CONCENTRATE "AGE IS TOO OLD, PROBABLY DUE TO PRESENCE OF EXCESS ARGON" 8392 1 430 15 hornblende conventional K-Ar 267IIHB "4.962E-04, 0.581E-04, 1.1167E-04" 0.818 5.649 84 minimum age of metamorphic crystallization 99% HORNBLENDE 8393 1 392 20 hornblende conventional K-Ar MNC-2HB "4.962E-04, 0.581E-04, 1.1167E-04" 0.312 1.965 52 99% HORNBLENDE CONCENTRATE PROBABLY A COOLING AGE 8394 1 635 20 hornblende conventional K-Ar 1239HB "4.962E-04, 0.581E-04, 1.1167E-04" 0.223 2.506 73 99% HORNBLENDE CONCENTRATE "AGE IS TOO OLD, PROBABLY DUE TO THE PRESENCE OF EXCESS ARGON. A NEARBY SAMPLE GAVE HORNBLENDE K-AR AGES OF 1066 AND 892 M.Y. (THE LATTER AGE BY T HE 40AR/39AR METHOD)." 8395 1 420 10 hornblende 39Ar-40Ar total fusion 348H "4.962E-04, 0.581E-04, 1.1167E-04" THIS IS A 40AR/39AR TOTAL GAS AGE "AGE IS TOO YOUNG, PROBABLY A COOLING AGE." 8396 1 892 20 hornblende 39Ar-40Ar total fusion 349H "4.962E-04, 0.581E-04, 1.1167E-04" THIS IS A 40AR/39AR TOTAL GAS AGE "AGE IS TOO OLD, PROBABLY DUE TO THE PRESENCE OF EXCESS ARGON. CONVENTIONAL K-AR AGES OF 1047 AND 995 M.Y. WERE OBTAINED FOR THIS SAMPLE (SEE MARVIN AND DOBSON, 1979, ENTRY 233, P. 27)." 8397 1 125 4 hornblende conventional K-Ar 1. MHD-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.77 1.434 828182 "K=0.639%; RAD40AR=1.428, 1.444, 1.429XE-10 M0L/GM" AGE IS PROBABLY TOO OLD DUE TO THE PRESENCE OF EXCESS ARGON. 8397 2 77 2 biotite conventional K-Ar 1.MHD-4 "4.962E-04, 0.581E-04, 1.1167E-04" 7.59 8.5515 9085 age of intrusion "K=6.30%; RAD40AR=8.488, 8.615XE-10 MOL/GM" 8398 1 118 4 hornblende conventional K-Ar 2. HD-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.913 1.601 81 K=0.758% AGE IS PROBABLY TOO OLD DUE TO THE PRESENCE OF EXCESS ARGON. 8398 2 72 2 biotite conventional K-Ar 2. HD-4 "4.962E-04, 0.581E-04, 1.1167E-04" 6.51 6.908 90 age of intrusion K=5.40% 8399 1 75 2 biotite conventional K-Ar 3.MGD-6 "4.962E-04, 0.581E-04, 1.1167E-04" 8.04 8.9 8179 age of intrusion "K=6.67%; RAD40AR=8.842, 8.958XE-10 MOL/GM" 8400 1 73.2 2 whole rock conventional K-Ar 4.MQM-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.55 9.192 8684 age of volcanism "K=7.10%; RAD40AR=9.083, 9.301XE-10 MOL/GM" 8405 1 2.35 0.08 sanidine conventional K-Ar 1.CC77-4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.11 0.3175 76 K=7.56% 8406 1 2.35 0.08 sanidine conventional K-Ar 2. CC77-8 "4.962E-04, 0.581E-04, 1.1167E-04" 11.3 0.383 76 age of volcanism K=9.38% 8407 1 2.63 0.1 glass conventional K-Ar 3.CC77-9 "4.962E-04, 0.581E-04, 1.1167E-04" 5.25 0.1986 54 age of volcanism K=4.36% 8408 1 2.74 0.1 sanidine conventional K-Ar 4. CC77-15 "4.962E-04, 0.581E-04, 1.1167E-04" 5.91 0.2335 62 age of volcanism K=4.91% 8409 1 2.54 0.09 glass conventional K-Ar 5.CC77-18 "4.962E-04, 0.581E-04, 1.1167E-04" 4.81 0.1758 58 age of volcanism K=3.99% 8410 1 2.43 0.12 glass conventional K-Ar 6.CC77-19 "4.962E-04, 0.581E-04, 1.1167E-04" 4.95 0.1733 40 age of volcanism K=4.11% 8411 1 2.51 0.08 sanidine conventional K-Ar 7. CC77-20 "4.962E-04, 0.581E-04, 1.1167E-04" 10.26 0.372 79 age of volcanism K=8.52% 8412 1 2.43 0.08 sanidine conventional K-Ar 8. CC78-30 "4.962E-04, 0.581E-04, 1.1167E-04" 9.96 0.3491 78 age of volcanism K=8.27% 8413 1 2.67 0.1 plagioclase conventional K-Ar 9. CC79-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.86 0.0715 46 age of volcanism K=1.54% 8414 1 2.63 0.09 glass conventional K-Ar 10. CC79-8 "4.962E-04, 0.581E-04, 1.1167E-04" 5.54 0.2096 77 age of volcanism K=4.60% 8415 1 0.16 0.1 whole rock conventional K-Ar 1 (TS-137) "4.72E-04, 0.584E-04, 1.19E-04*" 0.64 0.0015 2 age of volcanism K=0.531%; RAD40AR=0.0033XE-6 CC/GM 8416 1 0.17 0.9 whole rock conventional K-Ar 2 (BT-72) "4.72E-04, 0.584E-04, 1.19E-04*" 3.45 0.0082 0 age of volcanism K=2.86% 8417 1 0.43 0.4 whole rock conventional K-Ar 3 (BT-31) "4.72E-04, 0.584E-04, 1.19E-04*" 3.7 0.0229 1 age of volcanism "K=3.04, 3.11%" 8418 1 0.44 0.12 whole rock conventional K-Ar 4 (TFJ-321) "4.72E-04, 0.584E-04, 1.19E-04*" 0.651 0.0041 33 age of volcanism "K=0.540%; RAD40AR=0.0096, 0.0090XE-6 CC/GM" 8419 1 0.48 0.2 whole rock conventional K-Ar 5A (S-23) "4.72E-04, 0.584E-04, 1.19E-04*" 0.32 0.0022 12 "K=0.266%; RAD40AR=0.0043, 0.0056XE-6 CC/GM" AGE APPEARS TOO YOUNG AS LAVA IS PALEOMAGNETICALLY REVERSED AND THEREFORE HAS A MINIMUM AGE OF O.7 M.Y. 8420 1 0.45 0.3 whole rock conventional K-Ar 5B (S-80) "4.72E-04, 0.584E-04, 1.19E-04*" 0.17 0.0011 12 "K=0.141%; RAD40AR=0.0014, 0.0036XE-6 CC/GM" AGE APPEARS TOO YOUNG AS LAVA IS PALEOMAGNETICALLY REVERSED AND THEREFORE HAS A MINIMUM AGE OF 0.7 M.Y. 8421 1 0.56 0.14 whole rock conventional K-Ar 6 (TFJ-427) "4.72E-04, 0.584E-04, 1.19E-04*" 0.62 0.005 33 "K=0.515%; RAD40AR=0.0114, 0.0109XE-6 CC/GM" AGE APPEARS TOO YOUNG AS LAVA IS PALEOMAGNETICALLY REVERSED AND THEREFORE HAS A MINIMUM AGE OF O.7 M.Y. 8422 1 0.7 0.05 whole rock conventional K-Ar 7 (EM-77) "4.72E-04, 0.584E-04, 1.19E-04*" 0.901 0.0091 912 age of volcanism "K=0.748%; RAD40AR=0.0195, 0.0212XE-6 CC/GM" 8423 1 0.8 0.9 whole rock conventional K-Ar 8 (B-4) "4.72E-04, 0.584E-04, 1.19E-04*" 3.45 0.0412 1 K=2.86% AGE APPEARS TO YOUNG AS UNIT IS OVERLAIN BY PALEOMAGNETICALLY REVERSED LAVAS WHICH INDICATE A MINIMUM AGE OF 0.9 M.Y. 8424 1 0.89 0.05 whole rock conventional K-Ar 9 (TFJ-363) "4.72E-04, 0.584E-04, 1.19E-04*" 1.11 0.0143 1412 age of volcanism "K=0.921%; RAD40AR=0.0329, 0.0313XE-6 CC/GM" 8425 1 1.14 0.2 whole rock conventional K-Ar 10A (TFJ-256) "4.72E-04, 0.584E-04, 1.19E-04*" 1.02 0.0167 54 age of volcanism "K=0.847%; RAD40AR=0.0348, 0.0401XE-6 CC/GM" 8426 1 1.46 0.3 whole rock conventional K-Ar 10B (TFJ-431) "4.72E-04, 0.584E-04, 1.19E-04*" 0.62 0.013 43 age of volcanism "K=0.515%; RAD40AR=0.0227, 0.0355XE-6 CC/GM" 8427 1 1.63 0.3 whole rock conventional K-Ar 11 (WR-11) "4.72E-04, 0.584E-04, 1.19E-04*" 0.349 0.0082 54 age of volcanism "K=0.290%; RAD40AR=0.0188, 0.0181XE-6 CC/GM" 8428 1 2.15 0.2 whole rock conventional K-Ar 12 (WR-308) "4.72E-04, 0.584E-04, 1.19E-04*" 1.181 0.0366 14 age of volcanism K=0.980%; 8429 1 2.13 0.2 whole rock conventional K-Ar 13 (WR-311) "4.72E-04, 0.584E-04, 1.19E-04*" 1.102 0.0338 87 age of volcanism "K=0.915%; RAD40AR=0.0707, 0.0806XE-6 CC/GM" 8430 1 2.2 0.1 whole rock conventional K-Ar 14A (MB-110) "4.72E-04, 0.584E-04, 1.19E-04*" 0.451 0.0143 93129 age of volcanism "K=0.374%; RAD40AR=0.0295, 0.0335, 0.0332XE-6 CC/GM" 8431 1 2.6 0.2 whole rock conventional K-Ar 14B (MB-132) "4.72E-04, 0.584E-04, 1.19E-04*" 0.451 0.0169 610 age of volcanism "K=0.374%; AR40=0.0355, 0.0403XE-6 CC/GM" 8432 1 2.92 0.2 whole rock conventional K-Ar 15 (B-22) "4.72E-04, 0.584E-04, 1.19E-04*" 1.389 0.0585 1212 age of volcanism "K=1.153%; RAD40AR=0.1303, 0.1317XE-6 CC/GM" 8433 1 3.35 0.2 whole rock conventional K-Ar 16 (5-84) "4.72E-04, 0.584E-04, 1.19E-04*" 1.026 0.0495 1010 age of volcanism "K=0.852%; RAD40AR=0.1137, 0.1080XE-6 CC/GM" 8434 1 4.67 0.4 whole rock conventional K-Ar 17 (WR-189 "4.72E-04, 0.584E-04, 1.19E-04*" 1.024 0.069 616 age of volcanism "K=0.850%; RAD40AR=0.142, 0.169XE-6 CC/GM" 8435 1 4.9 0.4 whole rock conventional K-Ar 18 (HB-7) "4.72E-04, 0.584E-04, 1.19E-04*" 0.943 0.0666 85 age of volcanism "K=0.783%; RAD40AR=0.1499, 0.1484XE-6 CC/GM" 8436 1 5 0.5 whole rock conventional K-Ar 19 (M-2) "4.72E-04, 0.584E-04, 1.19E-04*" 0.319 0.0229 610 age of volcanism "K=0.265%; RAD40AR=0.0573, 0.0454XE-6 CC/GM" 8437 1 5.12 0.1 whole rock conventional K-Ar 20 (EM-78) "4.72E-04, 0.584E-04, 1.19E-04*" 1.152 0.085 4622 "K=0.956%; RAD40AR=0.188, 0.194XE-6 CC/GM" 8438 1 5.11 0.2 whole rock conventional K-Ar 21 (S-74) "4.72E-04, 0.584E-04, 1.19E-04*" 1.1 0.081 17171710 age of volcanism "K=0.913%; RAD40AR=0.197, 0.184, 0.188, 1.160XE-6 CC/GM" 8439 1 5.33 0.1 whole rock conventional K-Ar 22 (WR-102) "4.72E-04, 0.584E-04, 1.19E-04*" 1.53 0.1175 3326 age of volcanism "K=1.27%; RAD40AR=0.2669, 0.2598XE-6 CC/GM" 8440 1 5.44 0.2 whole rock conventional K-Ar 23 (EM-20) "4.72E-04, 0.584E-04, 1.19E-04*" 0.79 0.062 23221510 age of volcanism "K=0.656%; RAD40AR=0.147, 0.172, 0.127, 0.113XE-6 CC/GM" 8441 1 5.44 0.7 whole rock conventional K-Ar 24 (WR-246) "4.72E-04, 0.584E-04, 1.19E-04*" 0.958 0.0751 65 age of volcanism "K=0.795%; RAD40AR=0.1739, 0.1629XE-6 CC/GM" 8442 1 5.9 0.6 whole rock conventional K-Ar 25 (WR-328) "4.72E-04, 0.584E-04, 1.19E-04*" 1.36 0.1158 86 age of volcanism "K=1.13%; RAD40AR=0.2843, 0.2348XE-6 CC/GM" 8443 1 5.93 1 whole rock conventional K-Ar 26 (M-8) "4.72E-04, 0.584E-04, 1.19E-04*" 0.145 0.0124 38 age of volcanism "K=0.120%; RAD40AR=0.0244, 0.0313XE-6 CC/GM" 8444 1 6.41 0.2 whole rock conventional K-Ar 27 (MB-17) "4.72E-04, 0.584E-04, 1.19E-04*" 1.052 0.0972 1634 age of volcanism "K=0.873%; RAD40AR=0.2194, 0.2155XE-6 CC/GM" 8445 1 6.28 0.2 whole rock conventional K-Ar 28 (MB-130) "4.72E-04, 0.584E-04, 1.19E-04*" 0.861 0.078 3232 age of volcanism "K=0.715%; RAD40AR=0.170, 0.179XE-6 CC/GM" 8446 1 7.47 0.1 whole rock conventional K-Ar 29A (WR-143) "4.72E-04, 0.584E-04, 1.19E-04*" 1.452 0.1565 5645 "K=1.205%; RAD40AR=0.3541, 0.3472XE-6 CC/GM" AGE IS PROBABLY AROUND 8 M.Y. 8446 2 8.31 0.6 hornblende conventional K-Ar 29B (WR-143-HB) "4.72E-04, 0.584E-04, 1.19E-04*" 0.446 0.0535 13 age of volcanism K=0.370% 8447 1 9.92 0.6 whole rock conventional K-Ar 30 (WR-248) "4.72E-04, 0.584E-04, 1.19E-04*" 0.873 0.125 1210 age of volcanism "K=0.730, 0.720%; RAD40AR=0.2805, 0.2499XE-6 CC/GM" 8448 1 16.32 3 whole rock conventional K-Ar 31 (M-9) "4.72E-04, 0.584E-04, 1.19E-04*" 0.269 0.0635 34 age of volcanism "K=0.223%; RAD40AR=0.1282, 0.1564XE-6 CC/GM" 8449 1 34.84 1.2 hornblende conventional K-Ar 1. CRS-413-H "4.72E-04, 0.585E-04, 1.19E-04*" 0.612 0.31 age of volcanism K=0.508% 8449 2 24.26 0.9 biotite conventional K-Ar 2.CRS-413-B "4.72E-04, 0.585E-04, 1.19E-04*" 7.47 2.627 age of metamorphic crystallization K=6.20% POSSIBLE TIME OF AN EARLY MIOCENE THERMAL EVENT. 8465 1 84.83 2.5 biotite conventional K-Ar JE13-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.885 11.11 9286 "K20=8.95, 8.82%; RAD40AR=11.06, 11.16XE-10 MOL/GM." AGE OF THE PLUTON IS AROUND 88 M.Y. 8465 2 87.64 2.7 hornblende conventional K-Ar JE13-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.339 0.4383 63 "K20=0.340, 0.338%" AGE OF THE PLUTON IS AROUND 88 M.Y. 8466 1 82.3 2.4 biotite conventional K-Ar JE14-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.925 10.82 87 LESS THAN 0.5% HORNBLENDE IMPURITIES "K20=8.95, 8.90%" AGE OF THE PLUTON IS AROUND 88 M.Y. 8466 2 94.95 3.3 hornblende conventional K-Ar JE14-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.357 0.5011 58 LESS THAN 1.0% HORNBLENDE IMPURITIES AGE OF THE PLUTON IS AROUND 88 M.Y. 8467 1 87.6 2.6 biotite conventional K-Ar JE20-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 10.83 81 ABOUT 3% HORNBLENDE AND 1% CHLORITE IMPURITIES "K20=8.37, 8.39%" AGE OF THE PLUTON IS AROUND 88 M.Y. 8467 2 93.11 3.1 hornblende conventional K-Ar JE20-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3465 0.4767 54 maximum age of intrusion "K20=0.348, 0.345%" 8468 1 89.78 2.6 biotite conventional K-Ar JE21-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.7 11.53 75 age of intrusion 2% HORNBLENDE-ACTINOLITE IMPURITY 8468 2 89.88 2.7 hornblende conventional K-Ar JE21-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.526 0.6979 75 age of intrusion "K20=0.525, 0.527%" 8468 3 94.2 10.7 amphiboles conventional K-Ar JE21-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0441 0.0614 28 age not evaluated COLORLESS AMPHIBOLE WITH ABOUT 1% HORNBLENDE AND BIOTITE IMPURITY POTASSIUM VALUE IS AVERAGE OF 5 ANALYSES 8469 1 87.92 2.6 biotite conventional K-Ar JE22-67 "4.72E-04, 0.585E-04, 1.19E-04*" 9.02 11.7 82 "K20=9.00, 9.04%" AGE OF THE PLUTON IS AROUND 88 M.Y. 8469 2 89.3 2.9 hornblende conventional K-Ar JE22-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.611 0.8053 79 age of intrusion "K20=0.610, 0.612%" 8470 1 93.11 2.8 biotite conventional K-Ar JE12A-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 12.23 92 age of intrusion 0.5% CHLORITE IMPURITY "K20=8.91, 8.87%" 8471 1 92.16 2.7 biotite conventional K-Ar RWT18-68 "4.72E-04, 0.585E-04, 1.19E-04*" 8.47 11.53 89 age of intrusion "K20=8.53, 8.50, 8.45, 8.40%" 8471 2 91.48 2.7 hornblende conventional K-Ar RWT18-68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8335 1.126 86 age of intrusion "K20=0.827, 0.840%" 8473 1 17 biotite conventional K-Ar (NOT GIVEN) "4.76E-04, 0.589E-04, 1.18E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 8474 1 14.7 1 biotite conventional K-Ar 1 no decay constants given 9.2 35 age of intrusion "ANALYTICAL DATA FROM ENGELS AND OTHERS, 1976, ENTRY 85." 8475 1 13 1 biotite conventional K-Ar 2 no decay constants given 7.2 40 age of intrusion "ANALYTICAL DATA FROM ENGELS AND OTHERS, 1976, ENTRY 82." 8476 1 22.7 2.2 biotite conventional K-Ar DFC-1E-60 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 2.677 age of intrusion 8477 1 23.16 2 biotite conventional K-Ar DFC-180-61 "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 2.852 76 age of intrusion 8478 1 20.96 2 biotite conventional K-Ar DFC-179-61 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 2.677 69 THIS IS A REDUCED AGE 8479 1 89.6 2.6 biotite conventional K-Ar RWT241-65 "4.72E-04, 0.584E-04, 1.19E-04*" 8.11 10.72 90 AGE OF INTRUSION IS PROBABLY 86 M.Y. 8479 2 87.4 2.6 biotite conventional K-Ar RWT241-65 "4.72E-04, 0.584E-04, 1.19E-04*" 8.11 10.46 82 AGE OF INTRUSION IS PROBABLY 86 M.Y. 8479 3 88.46 2.6 hornblende conventional K-Ar RWT241-65 "4.72E-04, 0.584E-04, 1.19E-04*" 0.429 0.56 83 age of intrusion 8480 1 88.41 2.6 hornblende conventional K-Ar RWT662-66 "4.72E-04, 0.584E-04, 1.19E-04*" 0.358 0.467 58 age of intrusion 8481 1 51.04 1.5 biotite conventional K-Ar 6W73 "4.72E-04, 0.584E-04, 1.19E-04*" 8.52 6.35 89 age of intrusion 8481 2 50.67 1.5 hornblende conventional K-Ar 6W73 "4.72E-04, 0.584E-04, 1.19E-04*" 0.688 0.509 72 age of intrusion 8482 1 49.07 1.4 biotite conventional K-Ar RWT242-65 "4.72E-04, 0.584E-04, 1.19E-04*" 8.49 6.08 93 age of intrusion 8483 1 47.77 1.4 biotite conventional K-Ar PM36 "4.72E-04, 0.584E-04, 1.19E-04*" 8.62 6.007 70 age of intrusion 8484 1 104.35 4 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.44 0.6805 99% PURE THIS IS A REDUCED AGE AND MAY INDICATE THE TIME OF A THERMAL EVENT. 8485 1 96.67 2.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 11.809 age of intrusion 99% PURE 8492 1 85.52 2.5 biotite conventional K-Ar L-589C "4.72E-04, 0.585E-04, 1.19E-04*" 8.09 10.2 93 initial age disturbed by later metamorphism "K=6.71, 6.72%" AGE OF BATHOLITH IS PROBABLY AROUND 180 M.Y. 8492 2 159.13 4.7 hornblende conventional K-Ar L-589C "4.72E-04, 0.585E-04, 1.19E-04*" 1.187 2.843 89 initial age disturbed by later metamorphism "K=0.98, 0.99%" AGE OF BATHOLITH IS PROBABLY AROUND 180 M.Y. 8493 1 72.65 2.1 biotite conventional K-Ar L-618 "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 8.88 9193 initial age disturbed by later metamorphism 32% HORNBLENDE IMPURITY ANALYTICAL DATA IS FROM ENGELS AND OTHERS (1976). THIS AGE ALSO REPORTED BY ENGELS (1971). BATHOLITH IS PROBABLY AROUND 180 M.Y. OLD. 8493 2 180.51 5.3 hornblende conventional K-Ar L-618 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9 2.46 9388 age of intrusion ANALYTICAL DATA IS FROM ENGELS AND OTHERS (1976). THIS AGE ALSO REPORTED BY ENGELS (1971). BATHOLITH IS PROBABLY AROUND 180 M.Y. OLD. 8494 1 138.92 4.1 muscovite conventional K-Ar L-277W "4.72E-04, 0.585E-04, 1.19E-04*" 10.25 21.31 9793 minimum age of intrusion "K=8.47, 8.55%; 40AR-RAD=21.32 AND 21.30XE-10 MOL/G" 8495 1 76.71 2.2 biotite conventional K-Ar L-277Y "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 10.38 92 initial age disturbed by later metamorphism "K=7.63, 7.65%" KRUGER ALKALIC COMPLEX IS PROBABLY AROUND 180 M.Y. OLD. 8495 2 170.4 5 hornblende conventional K-Ar L-277Y "4.72E-04, 0.585E-04, 1.19E-04*" 1.55 3.988 94 minimum age of intrusion "K=1.28, 1.29%" KRUGER ALKALIC COMPLEX IS PROBABLY AROUND 180 M.Y. OLD. 8496 1 144.28 4.2 biotite conventional K-Ar L-277Z "4.72E-04, 0.585E-04, 1.19E-04*" 9.48 20.5 89 initial age disturbed by later metamorphism "K=7.87, 7.87%" KRUGER ALKALIC COMPLEX IS PROBABLY AROUND 180 M.Y. OLD. 8497 1 71.57 2.1 biotite conventional K-Ar L-301 "4.72E-04, 0.585E-04, 1.19E-04*" 9.455 9.9385 9697 initial age disturbed by later metamorphism "K20=9.40, 9.51%; 40AR-RAD=9.890 AND 9.987XE-10 MOL/GM; ANALYTICAL DATA FROM ENGELS AND OTHERS (1976)." KRUGER ALKALIC COMPLEX IS PROBABLY AROUND 180 M.Y. OLD. THIS BIOTITE AGE ALSO REPORTED BY ENGELS (1971). 8497 2 174.75 5.1 hornblende conventional K-Ar L-301 "4.72E-04, 0.585E-04, 1.19E-04*" 2.07 5.4685 9796 minimum age of intrusion HASTINGSITE "K20=2.06, 2.08%; 40AR-RAD=5.495 AND 5.442XE-10 MOL/GM; ANALYTICAL DATA FROM ENGELS AND OTHERS (1976)." KRUGER ALKALIC COMPLEX IS PROBABLY AROUND 180 M.Y. OLD. THIS HORNBLENDE AGE ALSO REPORTED BY ENGELS (1971). 8498 1 190.45 15.6 hornblende conventional K-Ar CG10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.16 0.4627 58 minimum age of metamorphic crystallization ACTINOLITIC HORNBLENDE K=0.13% 8499 1 108.7 6.8 biotite conventional K-Ar AC39 "4.72E-04, 0.585E-04, 1.19E-04*" 6.625 10.69 92 age of intrusion K=5.50% 8500 1 154.42 5 biotite conventional K-Ar L-591 "4.72E-04, 0.585E-04, 1.19E-04*" 8.875 20.6 9697 initial age disturbed by later metamorphism "K20=8.80, 8.95%; 40AR-RAD=20.57, 20.64XE-10 MOL/GM" AGE OF TOATS COULEE PLUTON IS PROBABLY AROUND 170 M.Y. 8500 2 173.56 5 hornblende conventional K-Ar L-591 "4.72E-04, 0.585E-04, 1.19E-04*" 1.265 3.318 9394 minimum age of intrusion "K20=1.25, 1.28%; 40AR-RAD=3.288, 3.347XE-10 MOL/GM" 8501 1 182.82 5 biotite conventional K-Ar L-498-A "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 24.21 67 initial age disturbed by later metamorphism AGE OF THE LOOMIS PLUTON IS PROBABLY AROUND 194 M.Y. 8501 2 197.84 6 hornblende conventional K-Ar L-498-A "4.72E-04, 0.585E-04, 1.19E-04*" 0.6265 1.886 95 minimum age of intrusion "K20=0.627, 0.626%" 8502 1 52.61 2.6 hornblende conventional K-Ar L-590 "4.72E-04, 0.584E-04, 1.19E-04*" 0.86 0.661 72 age of intrusion 8503 1 53.33 2.3 hornblende conventional K-Ar L-147 "4.72E-04, 0.584E-04, 1.19E-04*" 0.906 0.706 74 age of intrusion 8504 1 50.34 1.8 hornblende conventional K-Ar L-657 "4.72E-04, 0.584E-04, 1.19E-04*" 0.811 0.596 83 age of volcanism 8505 1 51.55 1.5 hornblende conventional K-Ar 2H "4.72E-04, 0.585E-04, 1.19E-04*" 1.02 0.768 79 age of volcanism 8506 1 51.1 1.5 biotite conventional K-Ar 6B "4.72E-04, 0.585E-04, 1.19E-04*" 8.04 6 79 age of intrusion 8507 1 50.98 1.5 biotite conventional K-Ar 7B "4.72E-04, 0.585E-04, 1.19E-04*" 6.3 4.69 88 age of intrusion 8508 1 51.66 1.5 biotite conventional K-Ar 1B "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 6.61 92 age of volcanism 8509 1 51.63 1.5 biotite conventional K-Ar 4B "4.72E-04, 0.585E-04, 1.19E-04*" 8.66 6.53 90 age of intrusion 8510 1 53.38 1.5 hornblende conventional K-Ar 5H "4.72E-04, 0.585E-04, 1.19E-04*" 1.5 1.17 84 age of intrusion "KAERSUTITE, TITANIUM-RICH HORNBLENDE" 8511 1 51.12 1.5 hornblende conventional K-Ar 10H "4.72E-04, 0.585E-04, 1.19E-04*" 0.639 0.477 63 age of volcanism 8512 1 51.98 1.5 biotite conventional K-Ar 3B "4.72E-04, 0.585E-04, 1.19E-04*" 8.6 6.53 93 age of intrusion 8513 1 42.72 1.2 biotite conventional K-Ar 8B "4.72E-04, 0.585E-04, 1.19E-04*" 6.78 4.22 58 initial age disturbed by weathering AGE IS TOO YOUNG. 8513 2 42.12 1.2 biotite conventional K-Ar 8B "4.72E-04, 0.585E-04, 1.19E-04*" 6.78 4.16 48 initial age disturbed by weathering AGE IS TOO YOUNG 8514 1 41.29 1.3 biotite conventional K-Ar 9B "4.72E-04, 0.585E-04, 1.19E-04*" 5.92 3.56 56 initial age disturbed by weathering AGE IS TOO YOUNG 8515 1 96 3 hornblende conventional K-Ar 12H "4.72E-04, 0.585E-04, 1.19E-04*" 0.944 1.34 76 minimum age of intrusion 8516 1 92.95 3 biotite conventional K-Ar 13B "4.72E-04, 0.585E-04, 1.19E-04*" 5.76 7.91 92 minimum age of intrusion 8516 2 98.62 3 muscovite conventional K-Ar 13M "4.72E-04, 0.585E-04, 1.19E-04*" 9.73 14.2 92 maximum age of intrusion 8517 1 102.66 2.8 biotite conventional K-Ar 11B "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 13.9 75 age of intrusion 8518 1 94.65 3 biotite conventional K-Ar 14B "4.72E-04, 0.585E-04, 1.19E-04*" 8.72 12.2 93 minimum age of intrusion 8519 1 101.91 3.2 muscovite conventional K-Ar 14M "4.72E-04, 0.585E-04, 1.19E-04*" 10.6 16 89 age of intrusion 8526 1 861 45 whole rock conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.06 0.953 67 AGE OF BASALT IS BETWEEN 830-920 M.Y. 8526 2 686.64 34 albite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.133 1.6 92 ALBITE AGE TOO YOUNG; BASALT IS BETWEEN 830-920 M.Y. OLD 8527 1 835.05 34 whole rock conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.104 1.59 63 AGE OF BASALT IS BETWEEN 830-920 M.Y. 8528 1 719.07 29 whole rock conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.114 1.45 75 AGE OF BASALT IS BETWEEN 830-920 M.Y.; THIS AGE IS TOO YOUNG. 8529 1 480.13 24 whole rock conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.112 0.887 69 AGE TOO YOUNG; BASALT IS BETWEEN 830-920 M.Y. OLD. 8529 2 928.37 37 albite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.119 2.08 51 ALBITE AGE OF BASALT IS BETWEEN 830-920 M.Y. 8529 3 617.45 30 pyroxenes conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.04 0.424 66 AGE TOO YOUNG; BASALT IS BETWEEN 830-920 M.Y. OLD. 8530 1 413.96 20 whole rock conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.093 0.623 30 AGE TOO YOUNG; BASALT IS BETWEEN 830-920 M.Y. OLD. 8531 1 238.16 12 whole rock conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.753 2.76 92 AGE TOO YOUNG; BASALT IS BETWEEN 830-920 M.Y. OLD. 8533 1 43.76 0.7 hornblende conventional K-Ar MSS68-401.1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.645 0.4113 61 age of intrusion 170-250 MESH SIZE 8536 1 50.57 1.6 biotite conventional K-Ar 0-36A "4.72E-04, 0.585E-04, 1.19E-04*" 9.025 6.663 85 A COOLING AGE; ROCK PROBABLY FORMED ABOUT 87 M.Y. AGO. 8536 2 51.06 1.6 muscovite conventional K-Ar 0-36A "4.72E-04, 0.585E-04, 1.19E-04*" 10.395 7.751 87 A COOLING AGE; ROCK PROBABLY FORMED ABOUT 87 M.Y. AGO. 8537 1 50.21 2.2 muscovite conventional K-Ar 0-37A "4.72E-04, 0.585E-04, 1.19E-04*" 10.415 7.634 36 -20 MESH PEGMATITE HAS A MINIMUM AGE OF ABOUT 51 M.Y. 8537 2 55.21 1.6 muscovite conventional K-Ar 0-37A "4.72E-04, 0.585E-04, 1.19E-04*" 10.415 8.406 38 -20 MESH PEGMATITE HAS A MINIMUM AGE OF ABOUT 51 M.Y. 8537 3 52.49 1.6 muscovite conventional K-Ar 0-37A "4.72E-04, 0.585E-04, 1.19E-04*" 10.375 7.955 82 PUNCHED 5-MM DISCS PEGMATITE HAS A MINIMUM AGE OF ABOUT 51 M.Y. 8537 4 52.06 1.6 muscovite conventional K-Ar 0-37A "4.72E-04, 0.585E-04, 1.19E-04*" 10.375 7.89 84 PUNCHED 5-MM DISCS PEGMATITE HAS A MINIMUM AGE OF ABOUT 51 M.Y. 8538 1 56.15 1.7 biotite conventional K-Ar 0-38A "4.72E-04, 0.585E-04, 1.19E-04*" 8.245 6.77 84 A COOLING AGE; ROCK PROBABLY FORMED ABOUT 87 M.Y. AGO. 8539 1 59.55 1.7 hornblende conventional K-Ar 0-131 "4.72E-04, 0.585E-04, 1.19E-04*" 2.05 1.787 86 A COOLING AGE; ROCK PROBABLY FORMED ABOUT 87 M.Y. AGO. 8540 1 50.55 1.7 hornblende conventional K-Ar 0-176D "4.72E-04, 0.585E-04, 1.19E-04*" 1.63 1.203 54 A COOLING AGE; ROCK PROBABLY FORMED ABOUT 87 M.Y. AGO 8541 1 51.26 1.5 biotite conventional K-Ar 0-296D "4.72E-04, 0.585E-04, 1.19E-04*" 8.61 6.445 82 A COOLING AGE; ROCK PROBABLY FORMED 87 M.Y. AGO 8541 2 55.29 1.6 hornblende conventional K-Ar 0-296D "4.72E-04, 0.585E-04, 1.19E-04*" 1.524 1.232 72 A COOLING AGE; ROCK PROBABLY FORMED 87 M.Y. AGO. 8542 1 49.25 1.5 biotite conventional K-Ar 0-419 "4.72E-04, 0.585E-04, 1.19E-04*" 8.89 6.39 78 age of intrusion 8542 2 49.4 1.5 hornblende conventional K-Ar 0-419 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8645 0.6234 58 age of intrusion 8543 1 50.34 1.5 biotite conventional K-Ar 0-424B "4.72E-04, 0.585E-04, 1.19E-04*" 9.015 6.626 78 age of intrusion 8544 1 47.13 1.4 biotite conventional K-Ar 0-425 "4.72E-04, 0.585E-04, 1.19E-04*" 9.455 6.5 83 A REDUCED AGE; ROCK PROBABLY FORMED 87 M.Y.AGO 8545 1 146.56 2.4 hornblende conventional K-Ar 1. (MR 69-104) "4.72E-04, 0.584E-04, 1.19E-04*" 0.0535 0.1176 38 minimum age of intrusion "K20=0.052, 0.053, 0.0545, 0.0545%" 8546 1 60.58 2.4 hornblende conventional K-Ar 2. (RWT 388-70) "4.72E-04, 0.584E-04, 1.19E-04*" 0.26 0.2306 43 age of intrusion 150-200 MESH "K20=0.277, 0.253, 0.257, 0.253, 0.260%" 8547 1 44.08 6.9 hornblende conventional K-Ar 6. (RWT66-72) "4.72E-04, 0.585E-04, 1.19E-04*" 0.2005 0.1288 332724 age not evaluated 150-375 MESH "K20=0.200, 0.197, 0.202, 0.203%; 40AR-RAD=0.1499, 0.1256, 0.1109XE-10 MOL/GM" 8547 2 36.35 1.3 hornblende conventional K-Ar 6. (RWT66AB-72) "4.72E-04, 0.585E-04, 1.19E-04*" 0.1885 0.0997 19 age not evaluated 200-325 MESH 8548 1 253 16 whole rock conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 8549 1 105 3 whole rock conventional K-Ar 11. (PM-18) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8550 1 108 4 whole rock conventional K-Ar 12.(PM-17) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8551 1 218 40 glaucophane-crossite conventional K-Ar 13. (PM-9) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8552 1 259 8 whole rock conventional K-Ar 14. (PM-24) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization THIS AGE ALSO REPORTED BY MISCH (1964) 8553 1 113 3 whole rock conventional K-Ar 15. (PM-16) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8554 1 2.79 0.3 biotite conventional K-Ar 16. (RWT480-67) "4.72E-04, 0.585E-04, 1.19E-04*" 9.215 0.3698 17 age of metamorphic crystallization 60-100 MESH "K20=9.22, 9.21%" 8555 1 2.52 0.1 biotite conventional K-Ar 17. (DFC-1-69) "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 0.3138 42 age of metamorphic crystallization 60-140 MESH 8556 1 3.7 1 hornblende conventional K-Ar 21. (RWT469A-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.3935 0.021 6 age of volcanism 80-100 MESH "K20=0.401, 0.386%" 8557 1 3.35 1 hornblende conventional K-Ar 22. (RWT469B-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.3915 0.0189 7 age of volcanism 100-140 MESH "K20=0.386, 0.397%" 8558 1 30.81 0.9 biotite conventional K-Ar 23. (RWT476-67) "4.72E-04, 0.585E-04, 1.19E-04*" 8.635 3.863 86 age of intrusion 60-100 MESH "K20=8.64, 8.63%" 8558 2 29.57 1.2 muscovite conventional K-Ar 23 (RWT476-67) "4.72E-04, 0.585E-04, 1.19E-04*" 10.72 4.602 83 age of intrusion 40-170 MESH "K20=10.68, 10.76%" 8559 1 25.64 0.8 biotite conventional K-Ar 24. (RWT475-67) "4.72E-04, 0.585E-04, 1.19E-04*" 8.635 3.21 86 age of intrusion 100-140 MESH "K20=8.63, 8.64%" 8559 2 27.07 3 amphiboles conventional K-Ar 24. (RWT475-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.365 0.1433 34 age of intrusion 100-140 MESH "K20=0.362, 0.368%" 8560 1 32.54 2.1 hornblende conventional K-Ar 25. (RWT482-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.253 0.1196 21 age not evaluated 140-200 MESH "K20=0.255, 0.251%" 8561 1 19.17 hornblende conventional K-Ar 26. (PM-28) "4.72E-04, 0.585E-04, 1.19E-04*" 0.852 0.2364 37 age not evaluated 40-80 MESH; 5% BIOTITE PRESENT "K20=0.851, 0.853%" 8561 2 27.16 hornblende 26. (PM-28) "4.72E-04, 0.585E-04, 1.19E-04*" 0.5 0.197 maximum age of intrusion 40-80 MESH; 5% BIOTITE PRESENT "K20=0.851, 0.853%, 40AR-RAD=0.2364XE-10MOL/GM; ANALYTICAL DATA CORRECTED FOR PRESENCE OF 5% BIOTITE" 8561 3 9.1 biotite conventional K-Ar 26. (PM-28) "4.72E-04, 0.585E-04, 1.19E-04*" 7.17 0.9419 44 minimum age of intrusion 40-60 MESH; IMPURE SAMPLE-5% HORNBLENDE PRESENT "K20=7.09, 7.19, 7.23%; 40AR-RAD=0.9407, 0.933, 0.952XE-10 MOL/GM" 8561 4 9.02 biotite 26. (PM-28) "4.72E-04, 0.585E-04, 1.19E-04*" 7.51 0.978 minimum age of intrusion 40-60 MESH; 5% HORNBLENDE PRESENT. 8562 1 31.06 1.4 hornblende conventional K-Ar 27. (RWT-471-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.4035 0.182 36 age not evaluated 140-200 MESH "K20=0.405, 0.402%" 8563 1 10.72 0.9 hornblende conventional K-Ar 28. (RWT-500-66) "4.72E-04, 0.585E-04, 1.19E-04*" 0.494 0.0765 15 age not evaluated 140-250 MESH "K20=0.494, 0.494%" 8564 1 21.87 0.7 biotite conventional K-Ar 29. (RWT-474-67) "4.72E-04, 0.585E-04, 1.19E-04*" 8.34 2.642 82 age of intrusion 60-80 MESH "K20=8.34, 8.34%" 8564 2 21.51 2.3 hornblende conventional K-Ar 29. (RWT-474-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.415 0.1293 35 age of intrusion 80-100 MESH "K20=0.414, 0.416%" 8565 1 22.98 0.7 hornblende conventional K-Ar 30. (RWT-501-66) "4.72E-04, 0.585E-04, 1.19E-04*" 0.5495 0.183 35 age of intrusion 40-200 MESH "K20=0.553, 0.546%" 8565 2 25.31 0.7 biotite conventional K-Ar 30. (RWT-501-66) "4.72E-04, 0.585E-04, 1.19E-04*" 8.55 3.138 7980 age of intrusion "K20=8.54, 8.56%; 40AR-RAD=3.149, 3.127XE-10 MOL/GM." 8566 1 31 biotite conventional K-Ar 31. (PM-7) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964). 8567 1 25.2 0.7 hornblende conventional K-Ar 32. (PM-27) "4.72E-04, 0.585E-04, 1.19E-04*" 0.6505 0.238 46 age of intrusion 40-100 MESH "K20=0.652, 0.649%" 8567 2 22.48 0.7 biotite conventional K-Ar 32. (PM-27) "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 2.71 48 age of intrusion 40-60 MESH 8568 1 23.77 0.7 biotite conventional K-Ar 33. (75R-66) "4.72E-04, 0.585E-04, 1.19E-04*" 9.015 3.106 68 age of intrusion "K20=9.00, 9.03%" 8569 1 31 1 biotite conventional K-Ar 34. (PM-13) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8570 1 29 1 biotite conventional K-Ar 35. (PM-14) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8571 1 49 biotite conventional K-Ar 36. (PM-6) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964). 8571 2 39 1 biotite conventional K-Ar 36. (PM-6) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8571 3 50 1 hornblende conventional K-Ar 36. (PM-6) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964). 8572 1 32 1 biotite conventional K-Ar 37. (PM-12) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1974). 8573 1 34 biotite conventional K-Ar 38. (PM-4) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8573 2 31.4 biotite conventional K-Ar 38. (PM-4) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8574 1 65 2.5 Unk conventional K-Ar 1A. "4.72E-04, 0.584E-04, 1.19E-04" (NO ANALYTICAL DATA GIVEN) APPROXIMATE AGE OF THE XENOCLASTS 8575 1 77.2 5 plagioclase conventional K-Ar 1. (NO.1) "4.72E-04, 0.584E-04, 1.18E-04" age not evaluated NO ANALYTICAL DATA GIVEN 8575 2 76.7 5.3 plagioclase conventional K-Ar 1. (NO. 1) "4.72E-04, 0.584E-04, 1.18E-04" age not evaluated NO ANALYTICAL DATA GIVEN 8576 1 26.5 0.7 whole rock conventional K-Ar 3. (NO.2) "4.72E-04, 0.584E-04, 1.18E-04" age not evaluated NO ANALYTICAL DATA GIVEN 8576 2 26.1 0.5 whole rock conventional K-Ar 3. (NO.2) "4.72E-04, 0.584E-04, 1.18E-04" age not evaluated NO ANALYTICAL DATA GIVEN 8577 1 4.5 0.1 whole rock conventional K-Ar 20. (G-3) "4.72E-04, 0.584E-04, 1.18E-04" 1.13 54 age not evaluated K=0.938% "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973" 8578 1 3.5 0.1 whole rock conventional K-Ar 21. (G-1A) "4.72E-04, 0.584E-04, 1.18E-04" age not evaluated NO ANALYTICAL DATA GIVEN "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8579 1 1.95 0.29 whole rock conventional K-Ar 23. (G-4) "4.72E-04, 0.584E-04, 1.18E-04" 1.358 28 age not evaluated K=1.127% "THIS AGE ORIGNALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8580 1 0.91 0.01 whole rock conventional K-Ar 24A (PP383-C) "4.72E-04, 0.584E-04, 1.18E-04" 1.993 39 age not evaluated K=1.654% "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8581 1 0.9 0.1 whole rock conventional K-Ar 24B. (PP383-C) "4.72E-04, 0.584E-04, 1.18E-04" 2.035 37 age not evaluated K=1.689% "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8582 1 0.3 0.08 whole rock conventional K-Ar 25. (KM-1) "4.72E-04, 0.584E-04, 1.18E-04" 0.717 14 age not evaluated 30-50 MESH K=0.595% "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8583 1 0.3 0.2 whole rock conventional K-Ar 26. (KM-1) "4.72E-04, 0.584E-04, 1.18E-04" 0.695 3 age not evaluated K=0.577% "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8584 1 0.1 0.1 whole rock conventional K-Ar 27. (KM-2) "4.72E-04, 0.584E-04, 1.18E-04" 1.282 2 age not evaluated K=1.064% "THIS AGE ORIGINALLY REPORTED BY KIENLE AND NEWCOMB, 1973." 8585 1 146.33 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 17.6 95 age of intrusion SAMPLE CEB-61-75 "ANALYTICAL DATA FROM MARVIN AND DOBSON, 1979" "AN AGE OF 146 M.Y. REPORTED FOR THIS SAMPLE BY MARVIN AND DOBSON, 1979, (ENTRY 226)." 8586 1 120.85 6 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.78 15.8 91 age of intrusion SAMPLE CEB-61-76 "ANALYTICAL DATA FROM MARVIN AND DOBSON, 1979" "AN AGE OF 121 M.Y. WAS REPORTED FOR THIS SAMPLE BY MARVIN AND DOBSON, 1979, (ENTRY 227)." 8587 1 151.97 4 phengite conventional K-Ar Sep-54 "4.72E-04, 0.585E-04, 1.19E-04*" 10.22 23.33 80 age of metamorphic crystallization "K20=10.18, 10.27%" 8587 2 135.43 5 glaucophane-crossite conventional K-Ar Sep-54 "4.72E-04, 0.585E-04, 1.19E-04*" 0.113 0.2288 56 "K20=0.113, 0.113%" AGE IS TOO YOUNG 8588 1 145.05 4 phengite conventional K-Ar 29-69 "4.72E-04, 0.585E-04, 1.19E-04*" 9.68 21.05 72 minimum age of metamorphic crystallization "K20=9.66, 9.70%" 8588 2 134.98 8 glaucophane-crossite conventional K-Ar 29-69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.084 0.1695 37 "K20=0.082, 0.086%" AGE IS TOO YOUNG 8588 3 144.25 6 actinolite conventional K-Ar 29-69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.132 0.2854 34 minimum age of metamorphic crystallization "K20=0.132, 0.132%" 8589 1 152.74 4 phengite conventional K-Ar 56-69 "4.72E-04, 0.585E-04, 1.19E-04*" 9.87 22.65 69 age of metamorphic crystallization "K20=9.87, 9.87%" 8589 2 134.86 13 glaucophane-crossite conventional K-Ar 56-69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.025 0.0504 12 "K20=0.025, 0.025%" AGE IS TOO YOUNG 8590 1 150.28 4 phengite conventional K-Ar 94-67 "4.72E-04, 0.585E-04, 1.19E-04*" 10.46 23.6 79 age of metamorphic crystallization "K20=10.46, 10.47%" 8590 2 148.47 8 glaucophane-crossite conventional K-Ar 94-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.075 0.1671 38 age of metamorphic crystallization "K20=0.073, 0.077%" 8591 1 154.26 4 hornblende conventional K-Ar 54-65 "4.72E-04, 0.585E-04, 1.19E-04*" 0.145 0.3362 50 age of metamorphic crystallization "K20=0.143, 0.147%" 8592 1 151.58 6 hornblende conventional K-Ar P-1064 "4.72E-04, 0.585E-04, 1.19E-04*" 0.426 0.9698 63 age of metamorphic crystallization 8593 1 149.4 phengite conventional K-Ar B-53-15 "4.72E-04, 0.585E-04, 1.19E-04*" 7.59 17.02 39 age of metamorphic crystallization 8593 2 127.55 actinolite conventional K-Ar B-53-15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.072 0.137 94 AGE IS TOO YOUNG 8594 1 152.8 6 glaucophane-crossite conventional K-Ar 55-CZ-59 "4.72E-04, 0.585E-04, 1.19E-04*" 0.257 0.59 25 age of metamorphic crystallization "AN AGE OF 150 M.Y. WAS REPORTED FOR PHENGITE FROM THIS SAMPLE BY LEE AND OTHERS, 1964." 8595 1 144.36 4 phengite conventional K-Ar 50-CZ-60 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 19.82 91 age of metamorphic crystallization "K20=9.14, 9.17%" "AN AGE OF 135 M.Y. WAS REPORTED FOR THIS PHENGITE BY LEE AND OTHERS, 1964." 8595 2 142.19 4 glaucophane-crossite conventional K-Ar 50-CZ-60 "4.72E-04, 0.585E-04, 1.19E-04*" 0.137 0.2918 55 age of metamorphic crystallization 8596 1 149 8 muscovite conventional K-Ar TIBURON "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization A MUSCOVITE-CHLORITE MIXTURE NO ANALYTICAL DATA GIVEN 8596 2 171 2 pyroxenes conventional K-Ar TIBURON "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN SPURIOUS AGE 8597 1 153.71 4 phengite conventional K-Ar Jun-66 "4.72E-04, 0.585E-04, 1.19E-04*" 9.97 23.03 69 age of metamorphic crystallization "K20=9.97, 9.97%" 8597 2 124.23 12 glaucophane-crossite conventional K-Ar Jun-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.064 0.1185 47 "K20=0.0625, 0.0663%" AGE IS TOO YOUNG 8597 3 157.62 6 actinolite conventional K-Ar Jun-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.108 0.2561 55 age of metamorphic crystallization "K20=0.108, 0.109%" 8598 1 158.72 8 actinolite conventional K-Ar Aug-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0705 0.1684 37 age of metamorphic crystallization "K20=0.0695, 0.0715%" 8598 2 152.37 5 hornblende conventional K-Ar Aug-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.602 1.378 86 age of metamorphic crystallization "K20=0.602, 0.603%" 8599 1 101.33 3 biotite conventional K-Ar C-246-D "4.72E-04, 0.585E-04, 1.19E-04*" 8.35 12.53 89 age not evaluated 80-100 MESH "K20=8.37, 8.33%" 8599 2 145.02 8.2 hornblende conventional K-Ar C-246-D "4.72E-04, 0.585E-04, 1.19E-04*" 1.1895 2.586 83 age not evaluated 100-120 MESH "K20=1.187, 1.192%" 8600 1 95 6.6 biotite conventional K-Ar C-139 "4.72E-04, 0.585E-04, 1.19E-04*" 9.065 12.73 90 age of intrusion 100-140 MESH "K20=9.06, 9.07%" 8601 1 90.91 2.8 biotite conventional K-Ar C-554 "4.72E-04, 0.585E-04, 1.19E-04*" 8.85 11.88 79 minimum age of intrusion 60-140 MESH "K20=8.83, 8.87%" 8602 1 74.57 4.6 hornblende conventional K-Ar 154. (C-555) "4.72E-04, 0.585E-04, 1.19E-04*" 0.5885 0.645 45 140-200 MESH "K20=0.588, 0.589%" PLUTON IS AROUND 81-82 M.Y. OLD. 8602 2 63.98 2.2 biotite conventional K-Ar 154. (C-555) "4.72E-04, 0.585E-04, 1.19E-04*" 9.105 8.537 72 age not evaluated 60-140 MESH "K20=9.13, 9.08%" PLUTON IS AROUND 81-82 M.Y. OLD. 8603 1 46.19 2 hornblende conventional K-Ar C-550 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7955 0.5358 59 age of volcanism 140-200 MESH "K20=0.794, 0.797%" 8604 1 43 2 biotite conventional K-Ar 40. (PM-1) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN THE APPROXIMATE AGE OF A METAMORPHIC EVENT; THIS AGE ALSO REPORTED BY MISCH (1964) 8605 1 44 2 biotite conventional K-Ar 41. (PM-2) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN THE APPROXIMATE AGE OF A METAMORPHIC EVENT; THIS AGE WAS ALSO REPORTED BY MISCH (1964). 8606 1 56 2 hornblende conventional K-Ar 44. (PM-20) "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964). 8607 1 48 2 biotite conventional K-Ar 45. (PM-3) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE MAY APPROXIMATE THE TIME OF A METAMORPHIC EVENT; AGE WAS ALSO REPORTED BY MISCH (1964). 8608 1 42.97 1.5 hornblende conventional K-Ar 47. (JE-1-68) "4.72E-04, 0.585E-04, 1.19E-04*" 1.0445 0.654 58 maximum age of metamorphic crystallization 140-200 MESH "K20=1.042, 1.047%" 8609 1 18 1 biotite conventional K-Ar 49 (PM-23) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN MISCH (1964) REPORTED AN AGE OF 10 M.Y. (IN ERROR) FOR THIS SAMPLE 8610 1 18.46 1.5 hornblende conventional K-Ar 50. (RWT-479-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.468 0.125 23 age of intrusion 140-200 MESH "K20=0.468, 0.468%" 8610 2 18.8 1 biotite conventional K-Ar 50. (RWT-479-67) "4.72E-04, 0.585E-04, 1.19E-04*" 8.525 2.32 78 age of intrusion "K20=8.50, 8.55%" 8611 1 34.17 5 biotite conventional K-Ar 55. (3) "4.72E-04, 0.585E-04, 1.19E-04*" 7.49 3.72 48 minimum age of intrusion THIS AGE ALSO REPORTED BY YEATS AND MCLAUGHLIN (1968) 8614 1 81.86 5 biotite conventional K-Ar 62 (2) "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 10.08 83 AGE APPEARS TOO YOUNG; THIS AGE REPORTED BY YEATS AND MCLAUGHLIN (1968) 8614 2 78.45 5 biotite conventional K-Ar 62 (2) "4.72E-04, 0.585E-04, 1.19E-04*" 8.36 9.65 72 AGE APPEARS TOO YOUNG; THIS AGE ALSO REPORTED BY YEATS AND MCLAUGHLIN (1968). 8615 1 18.6 0.4 whole rock conventional K-Ar 77 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN AGE APPEARS TOO YOUNG; AGE ALSO REPORTED BY HARTMAN (1973). 8616 1 16.7 4.3 plagioclase conventional K-Ar 86 "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY HARTMAN (1973) 8616 2 20.3 2.6 plagioclase conventional Rb-Sr (assumed initial 87Sr/86Sr) 86 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY HARTMAN (1973) 8617 1 21.7 1.9 whole rock conventional K-Ar 87 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY HARTMAN (1973) 8617 2 23.4 1.4 whole rock conventional K-Ar 87 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY HARTMAN (1973). 8619 1 20.5 1.5 plagioclase conventional K-Ar 90 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY HARTMAN (1973). 8619 2 19.5 1.8 plagioclase conventional K-Ar 90 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY HARTMAN (1973) 8620 1 21.93 0.3 hornblende conventional K-Ar 91. (SH-119-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.576 0.183 17 age of intrusion 200-325 MESH "K20=0.578, 0.580, 0.572%" 8621 1 3.18 0.3 hornblende conventional K-Ar 92. (SH-414-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.637 0.0292 4 -325 MESH "K20=0.645, 0.647, 0.620%" AGE OF PLUG IS PROBABLY AROUND 1 M.Y. 8621 2 0.76 0.06 biotite conventional K-Ar 92. (SH-414-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.315 0.0905 10 32-60 MESH "K20=8.30, 8.33%" AGE OF PLUG IS PROBABLY AROUND 1 M.Y. 8621 3 1.06 0.06 biotite conventional K-Ar 92. (SH-414-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.33 0.1272 9 age of intrusion 100-200 MESH "K20=8.33, 8.33%" 8622 1 72.09 2.1 hornblende conventional K-Ar 94. (DFC-285-62) "4.72E-04, 0.585E-04, 1.19E-04*" 1.41 1.493 79 minimum age of intrusion 60-120 MESH "K20=1.40, 1.42%" 8622 2 59.14 1.7 biotite conventional K-Ar 94. (DFC-285-62) "4.72E-04, 0.585E-04, 1.19E-04*" 8.825 7.639 93 age not evaluated 60-120 MESH "K20=8.82, 8.83%" 8623 1 29 0.8 biotite conventional K-Ar 95. (RWT-211-62) "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 3.712 76 age not evaluated 45-70 MESH "K20=8.84, 8.80%" 8624 1 77.58 2.1 muscovite conventional K-Ar 96. (DFC-86-60) "4.72E-04, 0.585E-04, 1.19E-04*" 9.98 11.39 92 age of intrusion 40-200 MESH "K20=9.98, 9.98%" 8624 2 71.11 2.1 biotite conventional K-Ar 96. (DFC-86-60) "4.72E-04, 0.585E-04, 1.19E-04*" 7.505 7.837 89 minimum age of intrusion "K20=7.49, 7.52%" 8625 1 84.38 2.5 hornblende conventional K-Ar 97. (DFC-60-62) "4.72E-04, 0.585E-04, 1.19E-04*" 0.9295 1.156 85 age not evaluated 80-120 MESH "K20=0.922, 0.937%" 8625 2 67.64 2 biotite conventional K-Ar 97. (DFC-60-62) "4.72E-04, 0.585E-04, 1.19E-04*" 8.695 8.628 91 age not evaluated 40-100 MESH "K20=8.68, 8.71%" 8625 3 71.81 2.1 muscovite conventional K-Ar 97. (DFC-60-62) "4.72E-04, 0.585E-04, 1.19E-04*" 8.305 8.759 89 age not evaluated 40-115 MESH "K20=8.26, 8.35%" 8626 1 77.17 2.4 biotite conventional K-Ar 98. (JE-16-67) "4.72E-04, 0.585E-04, 1.19E-04*" 9.435 10.71 87 age not evaluated 60-100 MESH "K20=9.42, 9.45%" 8626 2 92.69 3.1 hornblende conventional K-Ar 98. (JE-16-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.8595 1.177 56 minimum age of intrusion 140-200 MESH "K20=0.857, 0.862%" 8627 1 72.13 3.4 muscovite conventional K-Ar 99. (JE-15-67) "4.72E-04, 0.585E-04, 1.19E-04*" 8.265 8.757 61 age not evaluated 35-140 MESH "K20=8.21, 8.32%" 8627 2 71.79 2.2 biotite conventional K-Ar 99. (JE-15-67) "4.72E-04, 0.585E-04, 1.19E-04*" 8.895 9.379 82 age not evaluated 100-140 MESH "K20=8.85, 8.94%" 8627 3 90.36 3.2 hornblende conventional K-Ar 99. (JE-15-67) "4.72E-04, 0.585E-04, 1.19E-04*" 1.003 1.338 82 minimum age of intrusion 100-140 MESH "K20=1.003, 1.003%" 8628 1 58.49 2.3 biotite conventional K-Ar 100. (RWT-1A-60) "4.72E-04, 0.584E-04, 1.19E-04*" 9.02 7.72 92 age of intrusion THIS AGE ALSO REPORTED BY CATER AND CROWDER (1967). 8628 2 60.69 2.4 muscovite conventional K-Ar 100. (RWT-1A-60) "4.72E-04, 0.584E-04, 1.19E-04*" 9.25 8.22 91 age of intrusion THIS AGE ALSO REPORTED BY CATER AND CROWDER (1967) 8629 1 57.45 2.2 biotite conventional K-Ar 101. (RWT-1B-60) "4.72E-04, 0.584E-04, 1.19E-04*" 7.77 6.53 90 initial age disturbed by later metamorphism THIS AGE ALSO REPORTED BY CATER AND CROWDER (1967) 8632 1 46.18 2.6 biotite conventional K-Ar 112. (DFC-74D-55) "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 5.32 73 minimum age of intrusion 100-250 MESH 8633 1 46.33 1.5 biotite conventional K-Ar 113. (DFC-1G-60) "4.72E-04, 0.585E-04, 1.19E-04*" 8.61 5.817 94 minimum age of intrusion 70-120 MESH "K20=8.58, 8.64%" 8633 2 56.14 1.5 muscovite conventional K-Ar 113. (DFC-1G-60) "4.72E-04, 0.585E-04, 1.19E-04*" 9.315 7.647 91 age of intrusion 150-200 MESH "K20=9.28, 9.35%" 8634 1 45.21 3 phlogopite conventional K-Ar 114. (DC6626) "4.72E-04, 0.585E-04, 1.19E-04*" 5.695 3.754 86 10-20 MESH "K20=5.69, 5.70%" PROBABLE TIME OF MINERALIZATION 8635 1 25.16 0.7 sericite conventional K-Ar 117. (JE-23A-67) "4.72E-04, 0.585E-04, 1.19E-04*" 10.43 3.805 93 age not evaluated 120-140 MESH "K20=10.44, 10.42%" 8636 1 26.92 4.5 biotite conventional K-Ar 118. (JE-24-67) "4.72E-04, 0.585E-04, 1.19E-04*" 1.26 0.492 33 age not evaluated 100-140 MESH; ALTERED BIOTITE "K20=1.26, 1.26%" 8637 1 45.11 1.5 biotite conventional K-Ar 119. (0G-IT) "4.72E-04, 0.585E-04, 1.19E-04*" 5.605 3.686 7676 age of volcanism "K20=5.62, 5.59%; 40AR-RAD=3.745, 3.637XE-10 MOL/GM" THIS AGE ALSO REPORTED BY CATER AND CROWDER (1967). 8638 1 46.72 1.8 biotite conventional K-Ar 120. (DFC-1F-60) "4.72E-04, 0.584E-04, 1.19E-04*" 7.94 5.41 86 age not evaluated 8639 1 11.38 1.7 hornblende conventional K-Ar 123. (JE-17-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.2975 0.0489 5 age of intrusion 100-140 MESH "K20=0.289, 0.306%" 8640 1 65.94 1.9 hornblende conventional K-Ar 125. (C-677-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.952 0.9205 84 age of intrusion 60-115 MESH "K20=0.950, 0.954%" 8640 2 62.71 1.8 biotite conventional K-Ar 125. (C-677-1) "4.72E-04, 0.585E-04, 1.19E-04*" 7.55 6.936 92 minimum age of intrusion 60-115 MESH "K20=7.49, 7.61%" 8641 1 61.59 2 biotite conventional K-Ar 127. (C-724-1) "4.72E-04, 0.585E-04, 1.19E-04*" 7.155 6.454 92 42-60 MESH "K20=7.14, 7.17%" THIS IS NOT AN INITIAL AGE FOR THE CHELAN COMPLEX 8641 2 84.15 2.5 hornblende conventional K-Ar 127. (C-724-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.9095 1.128 82 20-40 MESH "K20=0.909, 0.910%" THIS IS NOT AN INITIAL AGE FOR CHELAN COMPLEX 8642 1 69.39 2 hornblende conventional K-Ar 134. (C-679-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.7805 0.7949 82 age not evaluated 60-100 MESH "K20=0.779, 0.782%" 8644 1 43.95 2.2 biotite conventional K-Ar 136. (FWC-252B) "4.72E-04, 0.585E-04, 1.19E-04*" 8.43 5.4 82 age of intrusion THIS AGE ALSO REPORTED BY CATER AND CROWDER (1967) 8645 1 46.06 1.8 hornblende conventional K-Ar 137. (C-685-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.667 0.448 67 age of intrusion 32-60 MESH "K20=0.664, 0.670%" THIS AGE ALSO REPORTED BY CATER AND CROWDER (1967) 8646 1 47.51 1.4 biotite conventional K-Ar 138. (C-541-1) "4.72E-04, 0.585E-04, 1.19E-04*" 4.855 3.365 80 age of intrusion 42-60 MESH "K20=4.85, 4.90%" 8647 1 43.64 2 hornblende conventional K-Ar 139. (DFC-1B-60) "4.72E-04, 0.585E-04, 1.19E-04*" 0.384 0.2442 32 age of intrusion 60-120 MESH "K20=0.381, 0.387%" 8647 2 44.77 1.3 biotite conventional K-Ar 139. (DFC-1B-60) "4.72E-04, 0.585E-04, 1.19E-04*" 7.925 5.172 87 age of intrusion 40-60 MESH "K20=7.92, 7.93%" 8648 1 90.77 2.7 hornblende conventional K-Ar 140. (PM26A) "4.72E-04, 0.585E-04, 1.19E-04*" 0.873 1.17 61 age of intrusion 40-80 MESH THIS AGE ALSO REPORTED BY MISCH (1964) 8649 1 73 2 biotite conventional K-Ar 141. (PM22) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964) 8650 1 49.02 4.7 riebeckite conventional K-Ar 142. (JE-26-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.9405 0.6728 21 age of intrusion 35-60 MESH "K20=0.938, 0.943%" 8651 1 38.8 biotite conventional K-Ar 144. (PM-5) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE APPEARS TOO YOUNG; THIS AGE WAS ALSO REPORTED BY MISCH (1964). 8652 1 47.92 1.9 hornblende conventional K-Ar 145. (JE-29A-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.776 0.5425 62 age of intrusion 80-100 MESH "K20=0.774, O.778%" 8653 1 48.2 biotite conventional K-Ar 146. (PM-15) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN THIS AGE ALSO REPORTED BY MISCH (1964). 8654 1 100.16 2.9 biotite conventional K-Ar 153. (H-1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.875 13.16 90 age of intrusion "K20=8.88, 8.87%" 8655 1 80.74 2.4 biotite conventional K-Ar 157. (T-156) "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 10.89 90 minimum age of intrusion "K20=9.16, 9.16%" 8655 2 83.2 2.4 hornblende conventional K-Ar 157. (T-156) "4.72E-04, 0.585E-04, 1.19E-04*" 0.564 0.6914 61 age of intrusion "K20=0.561, 0.567%" 8656 1 92.35 2.7 biotite conventional K-Ar 159. (T-152) "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 12.36 94 age not evaluated "K20=9.06, 9.06%" 8656 2 100.91 3 hornblende conventional K-Ar 159. (T-152) "4.72E-04, 0.585E-04, 1.19E-04*" 1.2595 1.882 83 minimum age of intrusion "K20=1.265, 1.254%" 8657 1 90.7 2.7 biotite conventional K-Ar 162. (T-153) "4.72E-04, 0.585E-04, 1.19E-04*" 9.005 12.06 93 age not evaluated "K20=9.00, 9.01%" 8657 2 95.9 2.8 hornblende conventional K-Ar 162. (T-153) "4.72E-04, 0.585E-04, 1.19E-04*" 0.578 0.8196 51 age not evaluated "K20=0.580, 0.576%" 8658 1 90.68 2.7 muscovite conventional K-Ar 163. (T-154) "4.72E-04, 0.585E-04, 1.19E-04*" 10.3 13.79 77 age not evaluated "K20=10.26, 10.34%" 8658 2 94.02 2.8 biotite conventional K-Ar 163. (T-154) "4.72E-04, 0.585E-04, 1.19E-04*" 9.32 12.95 94 age not evaluated "K20=9.34, 9.30%" 8659 1 96.9 2.8 muscovite conventional K-Ar 164. (T-155) "4.72E-04, 0.585E-04, 1.19E-04*" 10.745 15.4 67 age not evaluated "K20=10.71, 10.78%" 8659 2 110.67 3 biotite conventional K-Ar 164. (T-155) "4.72E-04, 0.585E-04, 1.19E-04*" 9.39 15.43 93 age not evaluated "K20=9.37, 9.41%" 8660 1 43.95 1.3 hornblende conventional K-Ar 165. (C-559) "4.72E-04, 0.585E-04, 1.19E-04*" 0.56 0.3587 27 age not evaluated "K20=0.556, 0.564%" 8661 1 102.52 3 biotite conventional K-Ar 174. (L-451C) "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 12.59 94 minimum age of intrusion "K20=8.26, 8.32%" 8661 2 118.51 3 hornblende conventional K-Ar 174. (L-451C) "4.72E-04, 0.585E-04, 1.19E-04*" 0.6935 1.223 8078 minimum age of intrusion "K20=0.701, 0.686%" 8662 1 161.02 4.7 biotite conventional K-Ar 181. (L-620R) "4.72E-04, 0.585E-04, 1.19E-04*" 8.38 20.32 96 minimum age of metamorphic crystallization "K20=8.40, 8.36%" 8663 1 52.4 3 plagioclase conventional K-Ar 199. (0BP-65-01) "4.72E-04, 0.584E-04, 1.19E-04*" 0.58 0.444 66 age of volcanism 8664 1 47.44 1.7 hornblende conventional K-Ar 200. (8A-BM-7) "4.72E-04, 0.584E-04, 1.19E-04*" 0.656 0.454 72 age of volcanism 8665 1 42.36 1.5 hornblende conventional K-Ar 202. (OBP-65-05) "4.72E-04, 0.584E-04, 1.19E-04*" 0.713 0.44 76 age of volcanism -100 MESH 8666 1 50.29 1.7 biotite conventional K-Ar 203. (A32-4-81) "4.72E-04, 0.584E-04, 1.19E-04*" 8.24 6.05 86 age of volcanism 50-100 MESH 8668 1 53.58 1.7 biotite conventional K-Ar 205. (OBP-65-07) "4.72E-04, 0.584E-04, 1.19E-04*" 8.2 6.42 76 age of intrusion 8668 2 54.97 2.7 hornblende conventional K-Ar 205. (OBP-65-07) "4.72E-04, 0.584E-04, 1.19E-04*" 0.85 0.683 77 age of intrusion +50 MESH 8669 1 54.69 2 biotite conventional K-Ar 206. (0BP-65-06) "4.72E-04, 0.584E-04, 1.19E-04*" 6.28 5.02 85 age of volcanism 8669 2 53.81 2.1 hornblende conventional K-Ar 206. (OBP-65-06) "4.72E-04, 0.584E-04, 1.19E-04*" 1.1 0.865 75 age of volcanism 80-100 MESH 8676 1 52.24 1.6 biotite conventional K-Ar 213. (OBP-65-04) "4.72E-04, 0.584E-04, 1.19E-04*" 9.16 6.99 90 age of intrusion 8677 1 49.54 3 plagioclase conventional K-Ar 214. (OBP-65-03) "4.72E-04, 0.584E-04, 1.19E-04*" 0.715 0.517 68 minimum age of volcanism 80-100 MESH 8677 2 51.61 2.5 plagioclase conventional K-Ar 214. (OBP-65-03) "4.72E-04, 0.584E-04, 1.19E-04*" 0.731 0.551 48 age of volcanism 100-150 MESH 8677 3 53.58 1.8 biotite conventional K-Ar 214. (OBP-65-03) "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 5.88 83 age of volcanism 8678 1 53.34 1.7 biotite conventional K-Ar 215. (OBP-65-02) "4.72E-04, 0.584E-04, 1.19E-04*" 8.16 6.36 94 age of volcanism 8678 2 45.83 2.2 plagioclase conventional K-Ar 215. (OBP-65-02) "4.72E-04, 0.584E-04, 1.19E-04*" 0.82 0.548 92 50-100 MESH AGE APPARENTLY TOO YOUNG 8678 3 46.31 1.6 plagioclase conventional K-Ar 215. (OBP-65-02) "4.72E-04, 0.584E-04, 1.19E-04*" 0.85 0.574 80 -100 MESH AGE APPARENTLY TOO YOUNG 8681 1 52.9 1.6 biotite conventional K-Ar 217. (OBP-65-08) "4.72E-04, 0.584E-04, 1.19E-04*" 8.54 6.6 92 age of intrusion +50 MESH 8682 1 68.73 2 hornblende conventional K-Ar 218. (F-2222-55) "4.72E-04, 0.584E-04, 1.19E-04*" 0.704 0.71 76 minimum age of metamorphic crystallization 8683 1 51.63 1.4 biotite conventional K-Ar 219. (F-2411-68) "4.72E-04, 0.584E-04, 1.19E-04*" 8.5 6.41 94 minimum age of metamorphic crystallization 8684 1 51.48 1.4 hornblende conventional K-Ar 220. (37TL7) "4.72E-04, 0.584E-04, 1.19E-04*" 0.983 0.739 89 age of volcanism 8685 1 51.43 1.3 biotite conventional K-Ar 221. (P-6-2) "4.72E-04, 0.584E-04, 1.19E-04*" 7.27 5.46 90 age of volcanism 8687 1 56.63 1.9 hornblende conventional K-Ar 252. (4-3A-67) "4.72E-04, 0.585E-04, 1.19E-04*" 0.856 0.709 63 age not evaluated "K20=0.855, 0.857%" 8689 1 83.83 muscovite conventional K-Ar 263. (4-101-67) "4.72E-04, 0.585E-04, 1.19E-04*" 10.725 13.25 43 age of intrusion "K20=10.72, 10.73%" MILLER AND ENGELS (1975) REPORTED AGES OF 84.3 M.Y. (MUSCOVITE) AND 59.0 M.Y. (BIOTITE) FOR THIS SAMPLE. 8690 1 54.33 1.5 biotite conventional K-Ar 287. (6ON7) "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 6.94 91 age of volcanism 8691 1 52.35 1.8 hornblende conventional K-Ar 288. (P-6-1) "4.72E-04, 0.584E-04, 1.19E-04*" 1.05 0.803 67 age of volcanism 8691 2 51.68 1.3 biotite conventional K-Ar 288. (P-6-1) "4.72E-04, 0.584E-04, 1.19E-04*" 8.32 6.28 94 age of volcanism 8692 1 50.49 3.5 hornblende conventional K-Ar 290. (86-69A) "4.72E-04, 0.585E-04, 1.19E-04*" 0.7185 0.5297 47 maximum age of intrusion "K20=0.716, 0.721%" 8692 2 48.08 1.3 biotite conventional K-Ar 290. (86-69A) "4.72E-04, 0.585E-04, 1.19E-04*" 8.665 6.078 76 age of intrusion "K20=8.65, 8.68%" 8693 1 48.49 1.6 hornblende conventional K-Ar 294. (215-69) "4.72E-04, 0.585E-04, 1.19E-04*" 0.905 0.6404 56 age of intrusion "K20=0.903, 0.907%" 8693 2 47.99 1.4 biotite conventional K-Ar 294. (215-69) "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 5.965 75 age of intrusion "K20=8.51, 8.53%" 8695 1 14.61 1 plagioclase conventional K-Ar 299. (OJW-64-01) "4.72E-04, 0.584E-04, 1.19E-04*" 0.467 0.0986 42 age of volcanism 8696 1 15.86 0.8 plagioclase conventional K-Ar 300. (OJW-64-02) "4.72E-04, 0.584E-04, 1.19E-04*" 0.395 0.0906 66 age of volcanism 8696 2 15.43 0.9 plagioclase conventional K-Ar 300. (OJW-64-02) "4.72E-04, 0.584E-04, 1.19E-04*" 0.395 0.0881 63 age of volcanism 8697 1 47.99 1.7 hornblende conventional K-Ar SAMPLE 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.689 0.4824 49 age of intrusion "K20=0.685, 0.693%; ANALYTICAL DATA FROM ENGELS AND OTHERS, 1976." 8697 2 47.83 1.3 biotite conventional K-Ar SAMPLE 1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.88 6.197 70 age of intrusion "K20=8.88, 8.88%; ANALYTICAL DATA FROM ENGELS AND OTHERS, 1976." 8698 1 52.27 5 hornblende conventional K-Ar SAMPLE 2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.608 0.4642 63 maximum age of intrusion "ANALYTICAL DATA FROM ENGELS AND OTHERS, 1976." 8698 2 49.13 1 biotite conventional K-Ar SAMPLE 2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 6.016 78 age of intrusion "K20=8.40, 8.33, 8.45%; ANALYTICAL DATA FROM ENGELS AND OTHERS, 1976." 8699 1 64.11 2 muscovite conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 10.995 10.33 90 age of intrusion 70-100 MESH "K20=10.99, 11.00%" 8700 1 51.65 2 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 8.825 6.657 88 age of intrusion 8700 2 327.07 23 hornblende conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 0.338 1.745 82 SPURIOUS AGE 8700 3 300.09 15 hornblende conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3555 1.671 65 UP-GRADED HORNBLENDE SEPARATE SPURIOUS AGE 8701 1 52.18 2 biotite conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 8.455 6.445 52 age of intrusion 8701 2 199.53 8 hornblende conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.374 1.136 61 SPURIOUS AGE 8702 1 15.74 0.3 whole rock conventional K-Ar 2-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.84 0.4188 81 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=1.53% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8702 2 15.58 0.3 whole rock conventional K-Ar 2-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.84 0.4146 76 age of volcanism PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=1.53% 8703 1 15.6 0.3 whole rock conventional K-Ar 3-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.82 0.4106 60 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=1.51% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8703 2 15.33 0.3 whole rock conventional K-Ar 3-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.82 0.4033 68 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=1.51% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8704 1 15.51 0.4 whole rock conventional K-Ar 6-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.81 0.4058 84 PALEOMAGNETIC CORE K=1.50% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8705 1 15.47 0.4 whole rock conventional K-Ar 17-4I "4.72E-04, 0.584E-04, 1.19E-04*" 1.01 0.2259 52 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.84% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8705 2 15.57 0.3 whole rock conventional K-Ar 17-4I "4.72E-04, 0.584E-04, 1.19E-04*" 1.01 0.2274 56 age of volcanism PALEOMAGNETIC CORE CRUSHED T0 10-15 MESH K=0.84% 8706 1 15.35 0.3 whole rock conventional K-Ar 17-4II "4.72E-04, 0.584E-04, 1.19E-04*" 1 0.2219 58 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.83% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8707 1 15.16 0.4 whole rock conventional K-Ar 17-6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.01 0.2214 53 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.835% 15.1 M.Y. 1S THE AVERAGE OF 28 AGE DETERMIANTIONS 8708 1 15.21 0.5 whole rock conventional K-Ar 51-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.576 0.3465 39 PALEOMAGNETIC CORE K=1.308% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8709 1 15.83 0.4 whole rock conventional K-Ar 51-2 "4.72E-04, 0.584E-04, 1.19E-04*" 1.608 0.368 36 PALEOMAGNETIC CORE K=1.335% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8710 1 15.87 0.4 whole rock conventional K-Ar 51-5 "4.72E-04, 0.584E-04, 1.19E-04*" 1.531 0.3513 43 PALEOMAGNETIC CORE K=1.271% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8710 2 15.6 0.4 whole rock conventional K-Ar 51-5 "4.72E-04, 0.584E-04, 1.19E-04*" 1.531 0.3453 65 PALEOMAGNETIC K=1.271% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8711 1 15.25 2 whole rock conventional K-Ar 51-6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.53 0.3373 7 PALEOMAGNETIC CORES K=1.270% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8711 2 15.18 0.3 whole rock conventional K-Ar 51-6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.53 0.3358 82 PALEOMAGNETIC CORES K=1.270% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8712 1 15.37 1.8 whole rock conventional K-Ar 61-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.187 0.2637 5 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.985% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8712 2 15.27 1.6 whole rock conventional K-Ar 61-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.187 0.262 6 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.985% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8713 1 15.88 0.4 whole rock conventional K-Ar 61-6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.048 0.2407 32 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.870% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8713 2 15.27 0.4 whole rock conventional K-Ar 61-6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.048 0.2314 46 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.870% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8714 1 15.4 0.4 whole rock conventional K-Ar 61-7 "4.72E-04, 0.584E-04, 1.19E-04*" 1.066 0.2374 51 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.885% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8714 2 15.42 0.4 whole rock conventional K-Ar 61-7 "4.72E-04, 0.584E-04, 1.19E-04*" 1.066 0.2377 33 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.885% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8715 1 15.45 0.5 whole rock conventional K-Ar 68-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.072 0.2394 24 PALEOMAGNETIC CORE K=0.890% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8715 2 15.5 1.1 whole rock conventional K-Ar 68-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.072 0.2402 7 PALEOMAGNETIC CORE K=0.890% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8716 1 15.72 0.9 whole rock conventional K-Ar 68-4 "4.72E-04, 0.584E-04, 1.19E-04*" 1.2 0.2727 9 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=1.00% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8717 1 15.76 1.4 whole rock conventional K-Ar 68-5 "4.72E-04, 0.584E-04, 1.19E-04*" 1.113 0.2537 6 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=0.924% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8718 1 15.23 0.4 whole rock conventional K-Ar 68-6 "4.72E-04, 0.584E-04, 1.19E-04*" 1.2 0.2642 29 PALEOMAGNETIC CORE CRUSHED TO 10-15 MESH K=1.00% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8719 1 15.12 0.5 whole rock conventional K-Ar 70-3 "4.72E-04, 0.584E-04, 1.19E-04*" 1.148 0.251 26 PALEOMAGNETIC CORE K=0.953% 15.1 M.Y. IS THE AVERAGE OF 28 AGE DETERMINATIONS 8720 1 15.39 0.4 whole rock conventional K-Ar 70-5 "4.72E-04, 0.584E-04, 1.19E-04*" 1.003 0.2232 34 PALEOMAGNETIC CORE K=0.833% 15.1 M.Y. IS AVERAGE OF 28 AGE DETERMINATIONS 8721 1 17.3 0.6 common micas conventional K-Ar SILVER CREEK "4.72E-04, 0.585E-04, 1.19E-04" 1.78 34 BIOTITE-SERICITE IMPURE CONCENTRATE K=1.48% PROBABLE TIME OF HYDROTHERMAL ALTERATION 8722 1 6.46 0.2 whole rock conventional K-Ar MESATCHEE "4.72E-04, 0.585E-04, 1.19E-04*" 1.61 0.15 3638 SERICITE-QUARTZ-PLAGIOCLASE CONCENTRATE "K=1.34%; 40AR-RAD=0.339, 0.334XE-6 CC/G" PROBABLE TIME OF HYDROTHERMAL ALTERATION. 8723 1 10.16 0.4 biotite conventional K-Ar NORTH FORK "4.72E-04, 0.585E-04, 1.19E-04*" 1.57 0.2302 51 IMPURE BIOTITE CONCENTRATE K=1.30% PROBABLE TIME OF HYDROTHERMAL ALTERATION 8724 1 16.61 0.6 biotite conventional K-Ar EARL "4.72E-04, 0.585E-04, 1.19E-04*" 7.13 1.713 66 K=5.92% PROBABLE TIME OF HYDROTHERMAL ALTERATION 8725 1 24.63 0.9 biotite conventional K-Ar MCCOY CREEK "4.72E-04, 0.585E-04, 1.19E-04*" 2 0.714 50 IMPURE SERICITE CONCENTRATE K=1.66% PROBABLE TIME OF HYDROTHERMAL ALTERATION 8726 1 6.43 0.2 biotite conventional K-Ar PYRAMID "4.72E-04, 0.585E-04, 1.19E-04*" 8.47 0.7853 46 HYDROTHERMAL BIOTITE K=7.03% PROBABLE TIME OF HYDROTHERMAL ALTERATION 8727 1 3.37 0.4 common micas conventional K-Ar DRY CREEK "4.72E-04, 0.585E-04, 1.19E-04*" 1.45 0.0705 8 AN IMPURE SERICITE-CHLORITE CONCENTRATE K=1.20% PROBABLE TIME OF HYDROTHERMAL ALTERATION 8728 1 14.81 0.4 whole rock conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 1.7 0.364 25 age of volcanism 10-30 MESH K=1.41% 8728 2 14.69 0.4 whole rock conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04*" 1.7 0.361 25 age of volcanism 10-30 MESH K=1.41% 8729 1 14.73 0.4 whole rock conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04*" 1.78 0.379 32 age of volcanism 10-30 MESH K=1.48% 8729 2 14.42 0.4 whole rock conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04*" 1.78 0.371 30 age of volcanism 10-30 MESH K=1.48% 8730 1 15.17 0.3 whole rock conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 0.83 0.182 36 age of volcanism -100 MESH K=0.69% 8730 2 14.92 0.3 whole rock conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04*" 0.83 0.179 45 age of volcanism K=0.69% 8731 1 14.7 0.3 whole rock conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.88 0.187 29 age of volcanism 10-30 MESH K=0.73% 8731 2 14.39 0.3 whole rock conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.88 0.183 25 age of volcanism 10-30 MESH K=0.73% 8731 3 14.54 0.3 whole rock conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.88 0.185 23 age of volcanism 10-30 MESH K=0.73% 8731 4 14.39 0.3 whole rock conventional K-Ar 4 "4.72E-04, 0.584E-04, 1.19E-04*" 0.88 0.183 22 age of volcanism -100 MESH K=0.73% 8732 1 14.8 0.4 whole rock conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04*" 1.65 0.353 51 age of volcanism 10-30 MESH K=1.37% 8733 1 15.6 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 1.49 0.336 49 age of volcanism 10-30 MESH K=1.24% 8733 2 15.68 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 1.49 0.3378 49 age of volcanism 10-30 MESH K=1.24% 8734 1 15.61 0.3 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 1.71 0.386 54 age of volcanism 10-30 MESH K=1.42% 8734 2 15.77 0.3 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 1.71 0.39 53 age of volcanism 10-30 MESH K=1.42% 8734 3 15.65 0.3 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 1.71 0.387 54 age of volcanism 10-30 MESH K=1.42% 8735 1 14.92 0.3 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 1.84 0.397 66 age of volcanism 10-30 MESH K=1.53% 8735 2 15.06 0.3 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 1.84 0.4007 70 age of volcanism 10-30 MESH K=1.53% 8736 1 16.81 0.3 whole rock conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04*" 1.89 0.4596 80 age of volcanism 10-30 MESH K=1.57% 8736 2 16.81 0.3 whole rock conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04*" 1.89 0.4596 85 age of volcanism 10-30 MESH K=1.57% 8736 3 18.92 0.3 whole rock conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04*" 1.89 0.5176 34 age not evaluated K=1.57% 8737 1 15.94 0.3 whole rock conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 3.31 0.763 86 age of volcanism 10-30 MESH K=2.75% 8737 2 15.66 0.3 whole rock conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 3.31 0.7496 85 age of volcanism 10-30 MESH K=2.75% 8737 3 17.98 0.3 whole rock conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 3.31 0.8612 17 age not evaluated K=2.75% 8738 1 15.81 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 1.77 0.4047 69 age of volcanism 10-30 MESH K=1.47% 8738 2 15.73 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 1.77 0.4025 84 age of volcanism 10-30 MESH K=1.47% 8739 1 15.21 0.3 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.761 0.1673 61 age of volcanism 10-30 MESH K=0.632% 8739 2 15.41 0.3 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.761 0.1696 62 age of volcanism 10-30 MESH K=0.632% 8740 1 16.3 0.3 whole rock conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 0.572 0.1348 42 age of volcanism 10-30 MESH K=0.475% 8740 2 16.34 0.3 whole rock conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04*" 0.572 0.1352 41 age of volcanism 10-30 MESH K=0.475% 8741 1 16.46 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.1419 61 age of volcanism 10-30 MESH K=0.495% 8741 2 16.57 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.1428 68 age of volcanism 10-30 MESH K=0.495% 8741 3 16.15 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.1392 47 age of volcanism -100 MESH K=0.495% 8741 4 16.36 0.3 whole rock conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.141 48 age of volcanism -100 MESH K=0.495% 8742 1 15.63 0.3 whole rock conventional K-Ar 5-11-2I "4.72E-04, 0.584E-04, 1.19E-04*" 0.79 0.1785 59 age of volcanism 10-30 MESH K=0.656% 8743 1 15.1 0.3 whole rock conventional K-Ar 5-11-2II "4.72E-04, 0.584E-04, 1.19E-04*" 0.793 0.1731 56 age of volcanism 10-30 MESH K=0.658% 8743 2 14.83 0.3 whole rock conventional K-Ar 5-11-2II "4.72E-04, 0.584E-04, 1.19E-04*" 0.793 0.17 53 age of volcanism 10-30 MESH K=0.658% 8743 3 14.79 0.3 whole rock conventional K-Ar 5-11-2II "4.72E-04, 0.584E-04, 1.19E-04*" 0.793 0.1696 34 age of volcanism -100 MESH K=0.658% 8744 1 15.26 0.3 whole rock conventional K-Ar 4/11/1997 "4.72E-04, 0.584E-04, 1.19E-04*" 0.566 0.1249 65 age of volcanism 10-30 MESH K=0.470% 8744 2 15.21 0.3 whole rock conventional K-Ar 4/11/1997 "4.72E-04, 0.584E-04, 1.19E-04*" 0.566 0.1245 53 age of volcanism -100 MESH K=0.470% 8744 3 15.01 0.3 whole rock conventional K-Ar 4/11/1997 "4.72E-04, 0.584E-04, 1.19E-04*" 0.543 0.1178 65 age of volcanism 10-30 MESH K=0.451% 8744 4 15.06 0.3 whole rock conventional K-Ar 4/11/1997 "4.72E-04, 0.584E-04, 1.19E-04*" 0.543 0.1182 66 age of volcanism 10-30 MESH K=0.451% 8745 1 15.15 0.3 whole rock conventional K-Ar 4/11/1998 "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.1124 60 age of volcanism 10-30 MESH K=0.426% 8745 2 14.86 0.3 whole rock conventional K-Ar 4/11/1998 "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.1102 30 age of volcanism -100 MESH K=0.426% 8746 1 15.99 0.4 whole rock conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 0.465 0.1075 35 age of volcanism -100 MESH K=0.386% 8747 1 16.4 0.3 whole rock conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.525 0.1245 39 age of volcanism 10-30 MESH K=0.436% 8747 2 15.99 0.3 whole rock conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.525 0.1214 40 age of volcanism 10-30 MESH K=0.436% 8747 3 15.92 0.3 whole rock conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.525 0.1209 35 age of volcanism -100 MESH K=0.436% 8748 1 15.73 0.3 whole rock conventional K-Ar 5-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.94 0.4413 75 age of volcanism 10-30 MESH K=1.61% 8748 2 15.73 0.3 whole rock conventional K-Ar 5-Nov "4.72E-04, 0.584E-04, 1.19E-04*" 1.94 0.4413 79 age of volcanism K=1.61% 8749 1 13.83 0.3 whole rock conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 1.25 0.2499 70 age of volcanism 10-30 MESH K=1.04% 8749 2 13.73 0.3 whole rock conventional K-Ar 5 "4.72E-04, 0.584E-04, 1.19E-04*" 1.25 0.2481 66 age of volcanism 10-30 MESH K=1.04% 8750 1 13.51 0.3 whole rock conventional K-Ar 16-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.166 0.2276 65 age of volcanism 10-30 MESH K=0.968% 8750 2 16.85 0.3 whole rock conventional K-Ar 16-1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.166 0.2842 13 age not evaluated K=0.968% 8751 1 14.06 0.3 whole rock conventional K-Ar 16-2 "4.72E-04, 0.584E-04, 1.19E-04*" 1.078 0.2191 61 age of volcanism 10-30 MESH K=0.895% 8752 1 5.04 0.3 glass conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 4.18 0.3038 17 age of volcanism "K20=4.15, 4.21%" "OTHER AGES IN THIS REPORT HAVE BEEN PUBLISHED ELSEWHERE. THIS AGE WAS ALSO PUBLISHED BY MCKEE AND OTHERS, 1976, BUT A DIFFERENT LOCATION WAS GIVEN FOR THE SAMPLE." 8753 1 4.42 0.34 glass conventional K-Ar MO73-32 "4.72E-04, 0.584E-04, 1.19E-04*" 3.715 0.2369 25 age of volcanism "K20=3.72, 3.71%" 8754 1 20.4 whole rock conventional K-Ar 1-Aug "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.176 29 A SINGLE PIECE OF BASALT K=0.495% AGE OF BASALT IS AROUND 16 M.Y. 8754 2 21.5 whole rock conventional K-Ar 1-Aug "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.186 17 SINGLE PIECE OF BASALT K=0.495% AGE OF BASALT IS ABOUT 16 M.Y. 8754 3 21.2 whole rock conventional K-Ar 1-Aug "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.183 18 A SINGLE PIECE OF BASALT K=0.495% AGE OF BASALT IS ABOUT 16 M.Y. 8754 4 20.63 whole rock conventional K-Ar 1-Aug "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.178 20 SINGLE PIECE OF BASALT K=0.495% AGE OF BASALT IS ABOUT 16 M.Y. 8754 5 16.94 whole rock conventional K-Ar 1-Aug "4.72E-04, 0.584E-04, 1.19E-04*" 0.596 0.146 59 A SINGLE PIECE OF BASALT K=0.495% AGE OF BASALT IS ABOUT 16 M.Y. 8755 1 14.48 whole rock conventional K-Ar 1-May "4.72E-04, 0.584E-04, 1.19E-04*" 0.793 0.166 42 age of volcanism A SINGLE PIECE OF BASALT K=0.658% 8756 1 15.5 whole rock conventional K-Ar 5-2-I "4.72E-04, 0.584E-04, 1.19E-04*" 0.79 0.177 49 age of volcanism 2 PIECES OF BASALT K=0.656% 8756 2 15.23 whole rock conventional K-Ar 5-2-I "4.72E-04, 0.584E-04, 1.19E-04*" 0.79 0.174 54 age of volcanism 10-30 MESH K=0.656% 8756 3 53.36 whole rock conventional K-Ar 5-2-I "4.72E-04, 0.584E-04, 1.19E-04*" 0.79 0.616 8 A SINGLE PIECE OF BASALT K=0.656% AGE OF BASALT IS ABOUT 15.1 M.Y. 8756 4 31.72 whole rock conventional K-Ar 5-2-I "4.72E-04, 0.584E-04, 1.19E-04*" 0.79 0.364 18 A SINGLE PIECE OF BASALT K=0.656% AGE OF BASALT IS ABOUT 15.1 M.Y. 8757 1 64.49 whole rock conventional K-Ar 4-1-I "4.72E-04, 0.584E-04, 1.19E-04*" 0.566 0.535 2 A SINGLE PIECE OF BASALT K=0.470% AGE OF BASALT IS ABOUT 14.7 M.Y. 8757 2 26.68 whole rock conventional K-Ar 4-1-I "4.72E-04, 0.584E-04, 1.19E-04*" 0.566 0.219 7 A SINGLE PIECE OF BASALT K=0.470% AGE OF BASALT IS ABOUT 14.7 M.Y. 8758 1 38.97 whole rock conventional K-Ar 4-1-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.543 0.308 2 A SINGLE PIECE OF BASALT K=0.451% AGE OF THE BASALT IS ABOUT 14.7 M.Y. 8758 2 52.32 whole rock conventional K-Ar 4-1-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.543 0.415 2 A SINGLE PIECE OF BASALT K=0.451% AGE OF THE BASALT IS ABOUT 14.7 M.Y. 8758 3 56.17 whole rock conventional K-Ar 4-1-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.543 0.446 3 A SINGLE PIECE OF BASALT K=0.451% AGE OF THE BASALT IS ABOUT 14.7 M.Y. 8759 1 24.48 whole rock conventional K-Ar 4-2-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.182 8 2 PIECES OF BASALT K=0.426% AGE OF BASALT IS ABOUT 14.7 M.Y. 8760 1 15.5 whole rock conventional K-Ar 4-2-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.115 65 age of volcanism SINGLE PIECE OF BASALT K=0.426%; SAMPLE HEATED AT 200-DEGREE C. FOR 89 HOURS 8760 2 17.52 whole rock conventional K-Ar 4-2-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.13 10 A SINGLE PIECE OF BASALT K=0.426%; SAMPLE HEATED AT 230-DEGREES C. FOR 17 HOURS AGE OF BASALT IS AROUND 14.7 M.Y. 8760 3 26.08 whole rock conventional K-Ar 4-2-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.194 5 A SINGLE PIECE OF BASALT K=0.426%; SAMPLE HEATED AT 150-DEGREES C. FOR 17 HOURS AGE OF BASALT IS ABOUT 14.7 M.Y. 8760 4 21 whole rock conventional K-Ar 4-2-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.156 1 A SINGLE PIECE OF BASALT K=0.426% SAMPLE HEATED AT 35-DEGREES C. FOR 21 HOURS AGE OF THE BASALT IS ABOUT 14.7 M.Y. 8760 5 21 whole rock conventional K-Ar 4-2-II "4.72E-04, 0.584E-04, 1.19E-04*" 0.513 0.156 9 A SINGLE PIECE OF BASALT K=0.426% AGE OF THE BASALT IS ABOUT 14.7 M.Y. 8761 1 16.95 whole rock conventional K-Ar 28-Feb "4.72E-04, 0.584E-04, 1.19E-04*" 0.465 0.114 50 A SINGLE PIECE OF BASALT K=0.386% AGE OF BASALT IS ABOUT 15.6 M.Y. 8761 2 15.91 whole rock conventional K-Ar 28-Feb "4.72E-04, 0.584E-04, 1.19E-04*" 0.465 0.107 53 age of volcanism A SINGLE PIECE OF BASALT K=0.386% 8761 3 16.21 whole rock conventional K-Ar 28-Feb "4.72E-04, 0.584E-04, 1.19E-04*" 0.465 0.109 59 age of volcanism A SINGLE PIECE OF BASALT K=0.386% 8761 4 30.51 whole rock conventional K-Ar 28-Feb "4.72E-04, 0.584E-04, 1.19E-04*" 0.465 0.206 17 A SINGLE PIECE OF BASALT K=0.386% AGE OF THE BASALT IS ABOUT 15.6 M.Y. 8762 1 27.57 whole rock conventional K-Ar 31-Dec "4.72E-04, 0.584E-04, 1.19E-04*" 0.525 0.21 15 A SINGLE PIECE OF BASALT K=0.436% AGE OF THE BASALT IS ABOUT 15.7 M.Y. 8762 2 15.54 whole rock conventional K-Ar 31-Dec "4.72E-04, 0.584E-04, 1.19E-04*" 0.525 0.118 43 minimum age of volcanism A SINGLE PIECE OF BASALT K=0.436% 8763 1 13.3 1.6 plagioclase conventional K-Ar 3. (3) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8763 2 13.5 0.5 whole rock conventional K-Ar 3. (3) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8763 3 13 0.7 whole rock conventional K-Ar 3. (3) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8763 4 16.5 1 plagioclase conventional K-Ar 3. (3) "4.72E-04, 0.584E-04, 1.18E-04" NO ANALYTICAL DATA GIVEN AGE APPEARS TO BE TOO OLD 8764 1 13.1 0.6 plagioclase conventional K-Ar 4. (6) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8764 2 13.1 0.5 plagioclase conventional K-Ar 4. (6) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8765 1 13 0.6 plagioclase conventional K-Ar 5. (5) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8765 2 12.2 0.6 plagioclase conventional K-Ar 5. (5) "4.72E-04, 0.584E-04, 1.18E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 8766 1 12.7 0.8 plagioclase conventional K-Ar 7. (4) "4.72E-04, 0.584E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 8766 2 12.3 0.8 plagioclase conventional K-Ar 7. (4) "4.72E-04, 0.584E-04, 1.18E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 8767 1 14.92 0.4 plagioclase conventional K-Ar BR-1-70 "4.72E-04, 0.585E-04, 1.19E-04*" 0.925 0.1995 81 age of volcanism 8768 1 14.66 0.4 plagioclase conventional K-Ar GWW-68-69 "4.72E-04, 0.585E-04, 1.19E-04*" 1.296 0.2747 74 age of intrusion 8769 1 13.13 0.4 plagioclase conventional K-Ar GWW-22-69 "4.72E-04, 0.585E-04, 1.19E-04*" 1.837 0.3485 73 age of volcanism 8770 1 12.9 1 plagioclase conventional K-Ar DKA-1174 "4.72E-04, 0.585E-04, 1.19E-04" 0.152 0.0349 35 age of volcanism (*) 8771 1 12.2 0.6 plagioclase conventional K-Ar DKA-1175 "4.72E-04, 0.585E-04, 1.19E-04" 0.184 0.04 65 age of volcanism (*) 8772 1 6.07 0.41 whole rock conventional K-Ar RCG-102-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.306 0.0268 16 age of volcanism "THIS AGE WAS ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8773 1 9.29 0.28 K feldspar conventional K-Ar RCG-106-1-65 "4.72E-04, 0.585E-04, 1.19E-04*" 6.9 0.9252 88 age of volcanism 8774 1 9.53 0.23 K feldspar conventional K-Ar RCG-61-1-65 "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 0.9298 92 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8775 1 3.75 0.6 plagioclase conventional K-Ar GWW-121-64 "4.72E-04, 0.585E-04, 1.19E-04*" 0.62 0.0335 59 age of volcanism THIS AGE ALSO REPORTED BY WALKER (1970). 8775 2 3.67 0.2 glass conventional K-Ar GWW-121-64 "4.72E-04, 0.585E-04, 1.19E-04*" 3.65 0.193 71 age of volcanism THIS AGE ALSO REPORTED BY WALKER (1970). 8776 1 6.75 2 plagioclase conventional K-Ar GWW-123-64 "4.72E-04, 0.585E-04, 1.19E-04*" 0.34 0.0331 26 age of volcanism THIS AGE ALSO REPORTED BY WALKER AND SWANSON (1969) 8777 1 4.03 0.4 plagioclase conventional K-Ar FB-1-70 "4.72E-04, 0.585E-04, 1.19E-04*" 0.377 0.0219 13 age of intrusion 8778 1 9.69 0.21 K feldspar conventional K-Ar GWW-16-65 "4.72E-04, 0.585E-04, 1.19E-04*" 6.65 0.9306 75 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8779 1 12.5 0.4 plagioclase conventional K-Ar GWW-16-69 "4.72E-04, 0.585E-04, 1.19E-04*" 0.525 0.0948 49 age of volcanism 8780 1 43.1 0.6 sanidine 39Ar-40Ar total fusion DAS-67-80 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism 8781 1 12.02 5.1 plagioclase conventional K-Ar RCG-162-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.152 0.0264 4 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8782 1 19.86 0.8 plagioclase conventional K-Ar RCG-166-68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.406 0.1167 59 age of volcanism "THIS AGE WAS ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)" 8783 1 9.45 0.5 sanidine conventional K-Ar RCG-248-66 "4.72E-04, 0.585E-04, 1.19E-04*" 7.12 0.971 15 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8784 1 7 0.33 anorthoclase conventional K-Ar RCG-257-3-66 "4.72E-04, 0.585E-04, 1.19E-04*" 4.93 0.4978 31 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8785 1 8.03 0.26 plagioclase conventional K-Ar RCG-54-5-66 "4.72E-04, 0.585E-04, 1.19E-04*" 1.155 0.1338 59 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8786 1 5.54 0.2 anorthoclase conventional K-Ar RCG-121-66 "4.72E-04, 0.585E-04, 1.19E-04*" 4.65 0.3713 60 age of volcanism "THIS AGE WAS ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8787 1 6.23 0.2 biotite conventional K-Ar PB-2-70 "4.72E-04, 0.585E-04, 1.19E-04*" 8.27 0.7434 53 age of intrusion 8787 2 6.7 0.3 plagioclase conventional K-Ar PB-2-70 "4.72E-04, 0.585E-04, 1.19E-04*" 1.27 0.1227 31 age of volcanism 8788 1 2.44 0.07 whole rock conventional K-Ar RCG-32-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.356 0.0125 39 age of volcanism "THIS AGE ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8789 1 7.09 1.09 plagioclase conventional K-Ar RCG-165-68 "4.72E-04, 0.585E-04, 1.19E-04*" 0.216 0.0221 18 age of volcanism "THIS AGE WAS ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8790 1 15.65 1 plagioclase conventional K-Ar RCG-185-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.262 0.0593 39 age of volcanism "THIS AGE WAS ALSO REPORTED BY GREENE, WALKER, AND CORCORAN (1972)." 8791 1 8.7 0.3 K feldspar conventional K-Ar GWW-176-62 "4.72E-04, 0.585E-04, 1.19E-04*" 7.15 0.8976 61 age of volcanism 8792 1 10.3 0.3 K feldspar conventional K-Ar GWW-140-61 "4.72E-04, 0.585E-04, 1.19E-04*" 6.67 0.9872 56 age of volcanism 8792 2 9.32 0.3 whole rock conventional K-Ar GWW-140-61 "4.72E-04, 0.585E-04, 1.19E-04*" 5.32 0.716 36 THIS AGE IS PROBABLY TOO YOUNG; K-FELDSPAR FROM THIS SAMPLE GAVE 10.0 M.Y. THIS AGE WAS ALSO REPORTED BY WALKER AND REPENNING (1965). 8793 1 14.71 0.4 plagioclase conventional K-Ar GWW-36-69 "4.72E-04, 0.585E-04, 1.19E-04*" 1.77 0.3763 72 age of volcanism 8794 1 15.32 0.4 plagioclase conventional K-Ar DC-2-70 "4.72E-04, 0.585E-04, 1.19E-04*" 1.482 0.3283 73 age of volcanism 8795 1 10.3 0.4 biotite conventional K-Ar RCG-281-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 7.75 1.152 51 age of volcanism 8795 2 9.79 0.6 plagioclase conventional K-Ar RCG-281-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.754 0.1066 32 age of volcanism 8796 1 10.76 0.4 glass conventional K-Ar KA392 "4.72E-04, 0.585E-04, 1.19E-04*" 4.89 0.76 79 age of volcanism 8797 1 16.46 0.8 sanidine conventional K-Ar BC-1-64 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 2.18 51 age not evaluated "A SANIDINE FROM ANOTHER SAMPLE OF THIS VOLCANIC UNIT GAVE AN AGE OF 13.6 M.Y. (DALRYMPLE, COX, DOELL, AND GROMME, 1967)" 8797 2 13.84 0.6 glass conventional K-Ar BC-1-64 "4.72E-04, 0.585E-04, 1.19E-04*" 5.7 1.14 84 age of volcanism 8798 1 13.49 K feldspar conventional K-Ar GWW-68-62 "4.72E-04, 0.585E-04, 1.19E-04*" 7.01 1.367 85 age of volcanism 8799 1 28.13 1.5 anorthoclase conventional K-Ar CC-1 "4.72E-04, 0.585E-04, 1.19E-04*" 5.15 2.102 29 age of volcanism THIS AGE WAS ALSO REPORTED BY WALKER (1973). 8800 1 27.72 0.8 biotite conventional K-Ar GWW-56-69 "4.72E-04, 0.585E-04, 1.19E-04*" 7.89 3.173 89 age of volcanism THIS AGE WAS ALSO REPORTED BY WALKER (1973) 8801 1 28.8 0.8 plagioclase conventional K-Ar SC-1-70 "4.72E-04, 0.585E-04, 1.19E-04*" 0.523 0.2186 67 age of volcanism THIS AGE WAS ALSO REPORTED BY WALKER (1973). 8802 1 9.53 0.23 K feldspar conventional K-Ar RCG-61-1-65 "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 0.9298 92 age of volcanism "SAMPLE NUMBER AND ANALYTICAL DATA ARE FROM WALKER, DALRYMPLE, LAMPHERE (1974)" "MOST OF THE K-AR AGES REPORTED IN THIS REFERENCE ARE ALSO LISTED BY WALKER, DALRYMPLE, AND LANPHERE (1974)" 8803 1 12.02 5.1 plagioclase conventional K-Ar RCG-162-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.152 0.0264 4 age of volcanism "SAMPLE NUMBER AND ANALYTICAL DATA TAKEN FROM WALKER, DALRYMPLE, LAMPHERE (1974)." "MOST OF THE K-AR AGES REPORTED IN THIS REFERENCE ARE ALSO LISTED BY WALKER, DALRYMPLE, AND LAMPHERE (1974)" 8804 1 9.7 0.3 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 8805 1 8.5 0.3 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of volcanism ANALYTICAL DATA NOT GIVEN 8806 1 1.27 0.53 whole rock conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8122 0.0149 6 age of volcanism "K=0.6785, 0.6699%" 8806 2 1.45 0.6 whole rock conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8122 0.0169 22 age of volcanism "K=0.6785, 0.6699%" 8807 1 1.96 0.5 whole rock conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7115 0.0201 9 age of volcanism "K=0.5914, 0.5898%" 8807 2 1.32 0.41 whole rock conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7115 0.0136 6 age of volcanism "K=0.5914, 0.5898%" 8808 1 0.26 0.03 whole rock conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7235 0.0027 2 age of volcanism "K=0.6018, 0.5993%" 8809 1 0.45 0.19 whole rock conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7071 0.0046 0 age of volcanism "K=0.5950, 0.5789%" 8810 1 0.27 0.02 whole rock conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5607 0.0021 2 age of volcanism "K=0.4747, 0.4562%" 8811 1 5.75 0.1 whole rock conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 1.988 0.1648 7 age of volcanism "K=1.656, 1.645%" 8812 1 3.7 0.05 whole rock conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 1.645 0.0877 20 age of volcanism "K=1.376, 1.355%" 8813 1 4.85 0.19 whole rock conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7464 0.0522 18 age of volcanism "K=0.6224, 0.6168%" 8814 1 4.67 0.07 whole rock conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7695 0.0518 8 age of volcanism "K=0.6422, 0.6353%" 8815 1 5.34 0.07 whole rock conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 1.019 0.0785 30 age of volcanism K=0.8457% AVG. 8816 1 3.98 0.06 whole rock conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6249 0.0359 17 age of volcanism "K=0.5190, 0.5185%" 8817 1 5.2 0.06 whole rock conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 1.088 0.0815 15 age of volcanism "K=0.9128, 0.8940%" 8818 1 2.87 0.18 whole rock conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9251 0.0383 15 age of volcanism "K=0.7786, 0.7572%" 8819 1 3.64 0.23 whole rock conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 1.198 0.0629 5 age of volcanism "K=0.9972, 0.9916%" 8820 1 3.45 0.09 whole rock conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4552 0.0226 7 age of volcanism "K=0.3793, 0.3765%" 8821 1 3.1 0.14 whole rock conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5841 0.0261 5 age of volcanism "K=0.4866, 0.4832%" 8822 1 11.26 0.75 whole rock conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 1.488 0.242 16 age of volcanism "K=1.240, 1.231%" 8823 1 11.51 0.17 whole rock conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 1.015 0.1688 11 age of volcanism "K=0.8442, 0.8402%" 8824 1 10.87 0.12 whole rock conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 1.638 0.257 35 age of volcanism "K=1.361, 1.358%" 8825 1 9.42 0.12 whole rock conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 0.843 0.1146 20 age of volcanism "K=0.7006, 0.6989%" 8826 1 11.07 0.28 whole rock conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 0.1939 0.031 6 age of volcanism "K=0.1612, 0.1607%" 8827 1 11.39 0.15 whole rock conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 1.644 0.2704 14 age of volcanism "K=1.370, 1.360%" 8828 1 8.69 0.11 whole rock conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 1.723 0.2162 56 age of volcanism "K=1.436, 1.425%" 8829 1 11.31 0.35 whole rock conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 2.383 0.3893 16 age of volcanism "K=1.973, 1.983%" 8830 1 16.35 0.21 whole rock conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 1.009 0.2386 18 age of intrusion "K=0.8395, 0.8349%" 8831 1 15.91 0.2 whole rock conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 1.594 0.3668 20 age of volcanism "K=1.331, 1.316%" 8832 1 17.16 0.2 whole rock conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 1.305 0.324 28 age of volcanism "K=1.088, 1.079%" 8833 1 17.68 0.2 whole rock conventional K-Ar 28 "4.72E-04, 0.585E-04, 1.19E-04*" 1.131 0.2893 26 age of volcanism "K=0.9458, 0.9324%" 8834 1 15.86 0.52 whole rock conventional K-Ar 29 "4.72E-04, 0.585E-04, 1.19E-04*" 1.42 0.3256 19 age of volcanism "K=1.182, 1.175%" 8835 1 15.43 0.2 whole rock conventional K-Ar 30 "4.72E-04, 0.585E-04, 1.19E-04*" 1.326 0.2958 47 age of volcanism "K=1.109, 1.093%" 8836 1 15.68 0.22 whole rock conventional K-Ar 31 "4.72E-04, 0.585E-04, 1.19E-04*" 1.046 0.2371 37 age of volcanism A SINGLE BLOCK OF ANDESITE "K=0.8698, 0.8670%" 8836 2 15.78 0.17 whole rock conventional K-Ar 31 "4.72E-04, 0.585E-04, 1.19E-04*" 1.116 0.2547 55 age of volcanism 30-60 MESH "K=0.9294, 0.9233%" 8837 1 14.59 0.16 whole rock conventional K-Ar 32 "4.72E-04, 0.585E-04, 1.19E-04*" 1.547 0.3263 34 age of volcanism "K=1.285, 1.284%" 8838 1 15.71 0.25 whole rock conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 1.155 0.2623 11 age of volcanism "K=0.9660, 0.9517%" 8839 1 14.02 0.17 whole rock conventional K-Ar 34 "4.72E-04, 0.585E-04, 1.19E-04*" 1.162 0.2354 29 age of volcanism "K=0.9682, 0.9609%" 8840 1 17.69 0.32 whole rock conventional K-Ar 35 "4.72E-04, 0.585E-04, 1.19E-04*" 1.173 0.3002 21 age of volcanism A SINGLE BLOCK OF ANDESITE "K=0.9804, 0.9667%" 8840 2 17.64 0.2 whole rock conventional K-Ar 35 "4.72E-04, 0.585E-04, 1.19E-04*" 1.291 0.3294 34 age of volcanism 30-60 MESH "K=1.084, 1.060%" 8841 1 13.13 0.76 whole rock conventional K-Ar 36 "4.72E-04, 0.585E-04, 1.19E-04*" 0.2056 0.039 2 age of volcanism "K=0.1768, 0.1645%" 8842 1 15.45 0.6 whole rock conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 1.264 0.2824 50 age of volcanism 18-30 MESH "K=1.057, 1.041%" 8842 2 15.65 0.24 whole rock conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 1.267 0.2868 54 age of volcanism 30-60 MESH "K=1.045, 1.059%" 8842 3 15.67 0.19 whole rock conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 1.296 0.2937 39 age of volcanism "30-60 MESH, HF ETCHED" "K=1.077, 1.074%" 8842 4 19.23 0.63 whole rock conventional K-Ar 37 "4.72E-04, 0.585E-04, 1.19E-04*" 1.267 0.3526 16 A SINGLE BLOCK OF BASALT "K=1.059, 1.045%" AGE IS APPARENTLY TOO OLD 8843 1 25.67 0.28 whole rock conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6157 0.2292 45 age of volcanism 30-60 MESH "K=0.5139, 0.5066%" 8843 2 22.46 3.77 whole rock conventional K-Ar 38 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7027 0.2286 1 age not evaluated A SINGLE BLOCK OF BASALT "K=0.6147, 0.5520" 8844 1 22.31 0.25 whole rock conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9755 0.3153 60 age of volcanism 30-60 MESH "K=0.8075, 0.8120%" 8844 2 23.88 0.8 whole rock conventional K-Ar 39 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9371 0.3243 14 age not evaluated A SINGLE BLOCK OF BASALT "K=0.7788, 0.7770%" 8845 1 22.39 0.36 whole rock conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 1.074 0.3484 58 age of volcanism 30-60 MESH "K=0.8928, 0.8898%" 8846 1 16.56 0.19 whole rock conventional K-Ar 41 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5101 0.1222 31 age of volcanism "K=0.4251, 0.4217%" 8847 1 15.32 0.28 whole rock conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 1.03 0.2282 27 age of volcanism "K=0.8591, 0.8511%" 8848 1 19.77 0.23 whole rock conventional K-Ar 43 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5775 0.1653 32 age of volcanism "K=0.4818, 0.4770%" 8849 1 15.77 0.18 whole rock conventional K-Ar 44 "4.72E-04, 0.585E-04, 1.19E-04*" 1.006 0.2294 27 age of volcanism "K=0.8365, 0.8336%" 8850 1 14.74 0.29 whole rock conventional K-Ar 45 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6587 0.1404 34 age of volcanism 30-60 MESH "K=0.5472, 0.5464%" 8850 2 35.28 0.85 whole rock conventional K-Ar 45 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6896 0.3537 7 A SINGLE BLOCK OF BASALT "K=0.5762, 0.5687%" A SPURIOUS AGE 8851 1 20.43 1.94 whole rock conventional K-Ar 46 "4.72E-04, 0.585E-04, 1.19E-04*" 0.6243 0.1847 6 age of volcanism "K=0.5206, 0.5159%" 8852 1 25.49 0.5 whole rock conventional K-Ar 47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.273 0.1009 13 age of volcanism "K=0.2294, 0.2239%" 8853 1 29.5 0.34 whole rock conventional K-Ar 48 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8634 0.3697 30 age of volcanism "K=0.7205, 0.7129%" 8854 1 21.9 0.55 whole rock conventional K-Ar 49 "4.72E-04, 0.585E-04, 1.19E-04*" 0.4192 0.133 29 age of volcanism K=0.3480% AVG 8855 1 29.86 0.34 whole rock conventional K-Ar 50 "4.72E-04, 0.585E-04, 1.19E-04*" 1.017 0.4408 32 age of volcanism "K=0.8533, 0.8344%" 8856 1 20.26 0.24 plagioclase conventional K-Ar 51 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8845 0.2594 32 age of volcanism "K=0.7282, 0.7402%" 8857 1 24.85 0.27 whole rock conventional K-Ar 52 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9717 0.35 64 age of volcanism "K=0.8079, 0.8053%" 8858 1 9.94 0.18 whole rock conventional K-Ar 53 "4.72E-04, 0.585E-04, 1.19E-04*" 1.48 0.2124 16 minimum age of intrusion "K=1.235, 1.222%" 8859 1 16.28 0.18 whole rock conventional K-Ar 54 "4.72E-04, 0.585E-04, 1.19E-04*" 4.901 1.154 32 age of volcanism "K=4.093, 4.044%" 8860 1 144.5 4 biotite conventional K-Ar 19-RGC-65 "4.72E-04, 0.585E-04, 1.19E-04*" 2.44 5.285 57 age of intrusion "K20=2.44, 2.45%" 8860 2 140.68 4 hornblende conventional K-Ar 19-RGC-65 "4.72E-04, 0.585E-04, 1.19E-04*" 0.453 0.9542 69 age of intrusion "K20=0.450, 0.456%" 8861 1 148.3 4 hornblende conventional K-Ar 34-RGC-65 "4.72E-04, 0.585E-04, 1.19E-04*" 0.728 1.62 78 age of intrusion "K20=0.725, 0.730%" 8862 1 144.55 4 muscovite conventional K-Ar 47-RGC-64-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.36 20.28 80 age of intrusion "K20=9.42, 9.30%" 8863 1 154.26 5 amphiboles conventional K-Ar 54-RGC-65A "4.72E-04, 0.585E-04, 1.19E-04*" 0.145 0.3362 50 age of metamorphic crystallization "K20=0.143, 0.147%" 8882 1 158.83 5 hornblende conventional K-Ar 4. YU-WT165 "4.72E-04, 0.584E-04, 1.19E-04*" 0.249 0.5952 3545 age of intrusion "K=0.201, 0.209, 0.210%; 40AR-RAD=1.354, 1.314XE-6 CC/GM" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8888 1 134.43 4 biotite conventional K-Ar 3. YU-WT35 "4.72E-04, 0.584E-04, 1.19E-04*" 7.54 15.15 83 initial age disturbed by later metamorphism "K=6.21, 6.31%" "BATHOLITH PROBABLY FORMED ABOUT 160 M.Y. AGO. THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8888 2 144.1 4 hornblende conventional K-Ar 3. YU-WT35 "4.72E-04, 0.584E-04, 1.19E-04*" 0.551 1.19 4739 initial age disturbed by later metamorphism "K=0.457, 0.458%; 40AR-RAD=2.59, 2.73XE-6 CC/GM" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8890 1 128.96 4 biotite conventional K-Ar 8. YU-WT216 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 16.07 76 age not evaluated "K=6.97, 6.90%" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8890 2 146.75 4 hornblende conventional K-Ar 8. YU-WT216 "4.72E-04, 0.584E-04, 1.19E-04*" 0.394 0.8672 3524 age not evaluated "K=0.317, 0.337%; 40AR-RAD=1.940, 1.947XE-6 CC/GM" "THIS AGE WAS ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8892 1 147.29 5 biotite conventional K-Ar 7. WT-211 "4.72E-04, 0.584E-04, 1.19E-04*" 7.35 16.24 age not evaluated K=6.10% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8899 1 163.65 5 hornblende conventional K-Ar 11. YU-WT146 "4.72E-04, 0.584E-04, 1.19E-04*" 0.332 0.8188 3229 age not evaluated "K=0.278, 0.272, 0.277%; 40AR-RAD=1.84, 1.83XE-6 CC/GM" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8902 1 120.67 4 biotite conventional K-Ar 12. YU-WT180 "4.72E-04, 0.584E-04, 1.19E-04*" 7.82 14.05 78 age not evaluated "K=6.52, 6.47%" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8910 1 97.41 3 biotite conventional K-Ar 13. WT-1019 no decay constants given* 7.12 10.26 63 age not evaluated K=5.91% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8911 1 138.7 4 biotite conventional K-Ar 14. WT-487 no decay constants given* 6.75 14.01 age not evaluated K=5.60% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8912 1 123.36 4 biotite conventional K-Ar 15. WT-751 no decay constants given* 8.28 15.22 74 age not evaluated K=6.87% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8913 1 149 5 biotite conventional K-Ar 16. WT-204 no decay constants given 6.51 age not evaluated K=5.40% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977) AND TAUBENECK (1966)." 8914 1 121.55 4 biotite conventional K-Ar 17. WT-308 no decay constants given* 9.49 17.18 age not evaluated K=7.88% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8915 1 117 3 biotite conventional K-Ar 18. WT-582 no decay constants given 7.41 age not evaluated "K=6.19, 6.11%" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8916 1 125.99 4 biotite conventional K-Ar 19. WT-811 no decay constants given* 9.07 17.04 age not evaluated "K=7.51, 7.54%" "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8917 1 130.33 4 biotite conventional K-Ar 20. WT-818 no decay constants given* 8.3 16.15 93 age not evaluated K=6.89% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8917 2 91.73 4 hornblende conventional K-Ar 20. WT-818 no decay constants given* 1.24 1.68 81 age not evaluated K=1.03% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8918 1 140.16 4 biotite conventional K-Ar 21. WT-745 no decay constants given* 7.53 15.8 age not evaluated K=6.25% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8919 1 94.89 3 muscovite conventional K-Ar 22. WT-988 no decay constants given* 7.6 10.66 84 age not evaluated BOOK MICA K=6.31% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)" 8920 1 120.39 4 biotite conventional K-Ar 23. WR-987 no decay constants given* 8.14 14.59 age not evaluated K=6.76% "THIS AGE ALSO REPORTED BY ARMSTRONG, TAUBENECK, HALES (1977)." 8921 1 33.58 1 biotite conventional K-Ar 24. YU-JM-291 "4.72E-04, 0.584E-04, 1.19E-04*" 6.62 3.23 5057 age of intrusion "K=5.54, 5.45%" 8921 2 34.53 1 hornblende conventional K-Ar 24. YU-JM-291 "4.72E-04, 0.584E-04, 1.19E-04*" 1.52 0.763 29 age of intrusion HORNBLENDE CONCENTRATE CONTAINS ABOUT 5% BIOTITE "K=1.27, 1.26%" 8924 1 18.3 hornblende conventional K-Ar F-R "4.8E-04, 0.58E-04*" 3.07 0.815 78 age of intrusion K=2.55% 8924 2 16.66 biotite conventional K-Ar F-R "4.8E-04, 0.58E-04*" 8.97 2.162 92 minimum age of intrusion K=7.45% 8924 3 16.56 biotite conventional K-Ar F-R "4.8E-04, 0.58E-04*" 8.97 2.149 36 minimum age of intrusion K=7.45%; SAMPLE WAS NOT DEGASSED BEFORE FUSION IN THE EXTRACTION LINE 8925 1 17.8 hornblende conventional K-Ar F-I "4.8E-04, 0.58E-04*" 1.39 0.357 58 age of intrusion K=1.15% 8925 2 16.81 biotite conventional K-Ar F-I "4.8E-04, 0.58E-04*" 8.47 2.059 84 minimum age of intrusion K=7.03% 8926 1 18.9 hornblende conventional K-Ar F-N "4.8E-04, 0.58E-04*" 1.19 0.325 72 age of intrusion K=0.99% 8926 2 19.16 hornblende conventional K-Ar F-N "4.8E-04, 0.58E-04*" 1.19 0.33 55 age of intrusion K=0.99% 8926 3 16.51 biotite conventional K-Ar F-N "4.8E-04, 0.58E-04*" 8.41 2.008 88 minimum age of intrusion K=6.98% 8934 1 89.7 1.8 biotite conventional K-Ar R-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 11.93 95 age of intrusion 8934 2 89.9 1.8 hornblende conventional K-Ar R-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.31 1.786 85 age of intrusion 8935 1 222 4.4 muscovite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.83 33.46 92 age of metamorphic crystallization 8936 1 222 2.5 muscovite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 10.32 35.04 82 age of metamorphic crystallization 8937 1 214 2.9 muscovite 39Ar-40Ar total fusion 2 "4.962E-04, 0.581E-04, 1.1167E-04" 89 age of metamorphic crystallization 40-39AR ANALYSIS 8938 1 223 3.2 muscovite 39Ar-40Ar total fusion 4 "4.962E-04, 0.581E-04, 1.1167E-04" 82 age of metamorphic crystallization CONCENTRATE IS A MIXTURE OF WHITE MICA AND ANTHOPHYLLITE 40-39AR ANALYSIS 8939 1 51.8 3.1 hornblende conventional K-Ar 530 "4.962E-04, 0.581E-04, 1.1167E-04" 0.915 0.6921 85 age of intrusion 8978 1 15.66 0.7 whole rock conventional K-Ar FRL-1170 "4.72E-04, 0.585E-04, 1.19E-04*" 1.794 0.4063 29 age of volcanism K=1.489% 8978 2 15.44 0.4 whole rock conventional K-Ar FRL-1170 "4.72E-04, 0.585E-04, 1.19E-04*" 1.794 0.4005 44 age of volcanism K=1.489% 8979 1 16.78 0.5 whole rock conventional K-Ar FRL-1171 "4.72E-04, 0.585E-04, 1.19E-04*" 1.242 0.3014 47 age of volcanism K=1.031 8979 2 16.79 1 whole rock conventional K-Ar FRL-1171 "4.72E-04, 0.585E-04, 1.19E-04*" 1.242 0.3017 25 age of volcanism K=1.031% 8979 3 16.41 0.7 whole rock conventional K-Ar FRL-1171 "4.72E-04, 0.585E-04, 1.19E-04*" 1.242 0.2948 31 K=1.031% 8979 4 17.16 0.8 whole rock conventional K-Ar FRL-1171 "4.72E-04, 0.585E-04, 1.19E-04*" 1.242 0.3083 30 age of volcanism K=1.031% 8980 1 12.75 1.3 whole rock conventional K-Ar FRL-1172 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7736 0.1425 17 age of volcanism K=0.6422% 8980 2 12.19 2.2 whole rock conventional K-Ar FRL-1172 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7736 0.1362 10 K=0.6422% AGE IS APPARENTLY TOO LOW 8980 3 13.06 1.3 whole rock conventional K-Ar FRL-1172 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7736 0.146 16 age of volcanism K=0.6422% 8981 1 16.54 0.6 whole rock conventional K-Ar FRL-1174 "4.72E-04, 0.585E-04, 1.19E-04*" 1.401 0.3352 36 age of volcanism K=1.1630% 8981 2 17.06 0.6 whole rock conventional K-Ar FRL-1174 "4.72E-04, 0.585E-04, 1.19E-04*" 1.401 0.3457 37 age of volcanism K=1.1630% 8982 1 16.87 0.8 whole rock conventional K-Ar FRL-1175 "4.72E-04, 0.585E-04, 1.19E-04*" 1.323 0.3228 30 age of volcanism K=1.0980% 8982 2 17.3 1.1 whole rock conventional K-Ar FRL-1175 "4.72E-04, 0.585E-04, 1.19E-04*" 1.323 0.3311 23 age of volcanism K=1.0980% 8982 3 15.5 0.6 whole rock conventional K-Ar FRL-1175 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE IS APPARENTLY TOO YOUNG 8983 1 79.8 4 Unk conventional K-Ar CORE 9576-9579 no decay constants given age of intrusion ANALYTICAL DATA NOT GIVEN "ANDESITE MAY BE EXTRUDED, NOT INTRUDED." 8983 2 83.4 2 Unk conventional K-Ar CORE 9576-9579 no decay constants given age of intrusion ANALYTICAL DATA NOT GIVEN "ANDESITE MAY BE EXTRUDED, NOT INTRUDED." 8984 1 29.7 1.8 Unk conventional K-Ar CUTTINGS 11840-11850 no decay constants given age of volcanism ANALYTICAL DATA NOT GIVEN 8984 2 30.3 1.4 Unk conventional K-Ar CUTTINGS 11840-11850 no decay constants given age of volcanism ANALYTICAL DATA NOT GIVEN 8985 1 0.22 0.26 whole rock conventional K-Ar 13 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism (ANALYTICAL DATA NOT GIVEN) 8986 1 0.97 0.25 whole rock conventional K-Ar 23 "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism (ANALYTICAL DATA NOT GIVEN) 8987 1 150 1.7 muscovite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 9.51 21.38 95 age of intrusion "THIS AGE ALSO REPORTED BY HIMMELBERG AND LONEY, 1973, P. 1587." 8988 1 15.79 0.3 whole rock conventional K-Ar YU-1N "4.72E-04, 0.584E-04, 1.19E-04*" 1.83 0.4178 56 age of intrusion "K=1.53, 1.51%" 8989 1 16.32 0.3 whole rock conventional K-Ar YU-E1 "4.72E-04, 0.584E-04, 1.19E-04*" 1.54 0.3634 25 age of intrusion "K=1.28, 1.28%" 8990 1 37.06 3.6 plagioclase conventional K-Ar 7. (SR63-45) "4.72E-04, 0.584E-04, 1.19E-04*" 0.23 0.124 41 age of volcanism "ANALYTICAL DATA FROM MARVIN AND DOBSON, 1979" "AN AGE OF 37.1 M.Y. WAS REPORTED FOR THIS SAMPLE BY MARVIN AND DOBSON, 1979, (ENTRY 222). THIS AGE ALSO REPORTED BY SNAVELY AND MACLEOD, 1974, P. 401." 8991 1 34.6 1.2 hornblende conventional K-Ar 9. (SR59-46) "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.5029 59 age of intrusion "ANALYTICAL DATA FROM MARVIN AND DOBSON, 1979" 8992 1 33.23 0.98 biotite conventional K-Ar 10. (SR59-9) "4.72E-04, 0.584E-04, 1.19E-04*" 5.84 2.82 81 age of intrusion "K20=5.81, 5.89, 5.85, 5.82%; ANALYTICAL DATA FROM MARVIN AND DOBSON, 1979" 8993 1 30.2 Unk conventional K-Ar 11. (SE57-3) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 8994 1 29.7 1.2 hornblende conventional K-Ar 14. (SR65-115) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN "THIS AGE ALSO REPORTED BY CLARK, 1969." 8995 1 16 0.65 Unk conventional K-Ar 16. (SR59-17) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 8996 1 28.17 0.8 anorthoclase conventional K-Ar GWW-3-60 "4.72E-04, 0.585E-04, 1.19E-04*" 4.89 1.999 73 age of volcanism THE ANORTHOCLASE CONTAINED 26PPM RB; 87SR/86SR=0.7034(INITIAL); 87SR/86SR=0.70428(OBSERVED) 8996 2 27.83 0.8 anorthoclase conventional K-Ar GWW-3-60 "4.72E-04, 0.585E-04, 1.19E-04*" 4.95 1.999 63 age of volcanism 8997 1 25.65 0.8 anorthoclase conventional K-Ar GWW-4-60 "4.72E-04, 0.585E-04, 1.19E-04*" 4.87 1.811 75 age of volcanism 8998 1 3.14 0.2 whole rock conventional K-Ar 70 "4.72E-04, 0.585E-04, 1.19E-04*" 2.1 0.0951 age of volcanism 8999 1 4.25 0.6 whole rock conventional K-Ar 49 "4.72E-04, 0.585E-04, 1.19E-04*" 1.51 0.0926 age of volcanism 9000 1 7.15 0.8 whole rock conventional K-Ar 40 "4.72E-04, 0.585E-04, 1.19E-04*" 1.31 0.1351 age of volcanism 9001 1 3.34 0.3 whole rock conventional K-Ar 97 "4.72E-04, 0.585E-04, 1.19E-04*" 1.61 0.0776 age of volcanism 9002 1 5.7 0.7 whole rock conventional K-Ar 72 "4.72E-04, 0.585E-04, 1.19E-04*" 1.43 0.1176 age of volcanism 9003 1 6.03 0.8 whole rock conventional K-Ar 33 "4.72E-04, 0.585E-04, 1.19E-04*" 1.18 0.1026 age of volcanism 9004 1 6.94 2 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.35 0.035 minimum age of volcanism 9005 1 11.99 1.2 whole rock conventional K-Ar 42 "4.72E-04, 0.585E-04, 1.19E-04*" 2.11 0.3653 AGE IS TOO OLD 9006 1 8.68 0.6 hornblende conventional K-Ar ITO 509 "4.72E-04, 0.584E-04, 1.19E-04*" 0.31 0.0389 14 age of intrusion K=0.26% THIS AGE MAY BE A PRIMARY AGE OR BE SPURIOUS 9007 1 8.08 0.6 hornblende conventional K-Ar ITO 512 "4.72E-04, 0.584E-04, 1.19E-04*" 0.29 0.0338 11 K=0.24% THIS AGE MAY BE A PRIMARY AGE OR BE SPURIOUS 9008 1 5.2 1 whole rock conventional K-Ar M.B.1-69 "4.72E-04, 0.584E-04, 1.19E-04*" 1.385 0.103 80 age of intrusion K=1.15% 9009 1 29.29 0.4 whole rock conventional K-Ar EMT-11 "4.72E-04, 0.585E-04, 1.19E-04*" 1.053 0.4477 66 age of intrusion "K=0.881, 0.875, 0.866%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 13." 9010 1 34.26 0.9 whole rock conventional K-Ar M-859 "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.498 26 age of intrusion "K=0.836, 0.828, 0.825%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 12." 9011 1 33.64 3 whole rock conventional K-Ar KF0-901 "4.72E-04, 0.585E-04, 1.19E-04*" 0.157 0.0768 8 age of volcanism "K=0.129, 0.131%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 12." 9012 1 47.31 4 hornblende conventional K-Ar W-3-58 "4.72E-04, 0.585E-04, 1.19E-04*" 0.578 0.3989 12 maximum age of intrusion "K=0.471, 0.488, 0.4795%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 12." 9012 2 41.61 0.9 whole rock conventional K-Ar W-3-58 "4.72E-04, 0.585E-04, 1.19E-04*" 1.807 1.095 45 minimum age of intrusion "K=1.51, 1.49%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 12." 9013 1 42.8 0.6 whole rock conventional K-Ar KF0-1112 "4.72E-04, 0.585E-04, 1.19E-04" 1.129 0.5185 62 age of volcanism "(*), K=0.925, 0.950%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 12." 9014 1 45.8 0.07 whole rock conventional K-Ar KFO-1702B "4.72E-04, 0.585E-04, 1.19E-04*" 1.45 0.9691 73 age of intrusion "K=1.20, 1.20, 1.19%; ADDITIONAL ANALYTICAL DATA CAN BE FOUND IN ISOCHRON/WEST, 1978, NO. 23, P. 12." 9015 1 21.12 0.7 whole rock conventional K-Ar UO-113KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.24 0.3793 18 age of volcanism K=1.03% 9016 1 8.1 0.9 whole rock conventional K-Ar UO-105KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.87 0.2186 10 age of intrusion K=1.55% 9017 1 16.08 0.4 whole rock conventional K-Ar UO-101KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.65 0.3837 59 age of volcanism K=1.37% 9018 1 17.26 0.5 whole rock conventional K-Ar UO-100KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.59 0.3971 68 age of volcanism K=1.32% 9019 1 14.16 0.5 whole rock conventional K-Ar UO-104KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.7 0.348 66 age of intrusion K=1.41% 9020 1 12.43 0.6 whole rock conventional K-Ar UO-103KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.64 0.2945 25 age of volcanism K=1.36% 9021 1 13.38 0.5 whole rock conventional K-Ar UO-102KAR "4.72E-04, 0.585E-04, 1.19E-04*" 1.73 0.3346 16 age of volcanism K=1.44% 9022 1 15.3 0.8 plagioclase conventional K-Ar KA2138 "4.72E-04, 0.584E-04, 1.19E-04" 0.532 22 age of volcanism K=0.442% 9023 1 14 2.7 plagioclase conventional K-Ar KA2134 "4.72E-04, 0.584E-04, 1.19E-04" 0.385 5 age of volcanism K=0.320% 9024 1 14.5 1 whole rock conventional K-Ar KA214OR "4.72E-04, 0.584E-04, 1.19E-04" 0.77 15 age of volcanism 100-250 MESH LEACHED WITH HCL TO REMOVE CARBONATE K=0.639% 9025 1 15.2 0.6 plagioclase conventional K-Ar KA2161 "4.72E-04, 0.584E-04, 1.19E-04" 1.59 38 age of volcanism K=1.32% 9026 1 128.3 6 whole rock conventional K-Ar CS-1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.22 4.25 44 age of volcanism K=1.84% "THE 8 K-AR AGES REPORTED IN THIS ARTICLE ARE ALSO REPORTED BY DOTT, 1965." 9027 1 8.1 0.5 Unk conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN PROBABLY AGE OF THE RHYOLITE DOME 9028 1 7.6 0.4 Unk conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN PROBABLE AGE OF THE RHYOLITE DOME 9029 1 50 4 plagioclase conventional K-Ar 2. (PEH-5-68) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 9030 1 30 3 plagioclase conventional K-Ar 3. (PEH-6-68) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 9031 1 20 2 biotite conventional K-Ar 5. (PEH-2-68) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 9032 1 16.5 2 biotite conventional K-Ar 8. (PEH-3-68) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 9033 1 25.26 1.8 whole rock conventional K-Ar 1. (UO-122KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 1.024 0.375 15 age not evaluated "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 27, ENTRY 9" 9034 1 15.61 1.1 whole rock conventional K-Ar 2A. (UO-117KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 2.06 0.465 18 age not evaluated "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 15" 9034 2 14.91 0.7 whole rock conventional K-Ar 2B. (UO-117KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 1.89 0.4075 65 age not evaluated "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 15" 9035 1 21 2.2 whole rock conventional K-Ar 4. (UO-131KAR) "4.72E-04, 0.585E-04, 1.19E-04" 0.488 1.527 22 age of volcanism "(*), ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 27, ENTRY 10" 9036 1 20.14 1 sanidine conventional K-Ar 5. (UO-114KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 8.65 2.522 87 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 27, ENTRY 11" 9037 1 18.98 1.7 glass conventional K-Ar 6. (UO-128KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 4.94 1.357 49 age not evaluated GLASS SHARDS "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 27, ENTRY 12" 9037 2 15.75 0.9 sanidine conventional K-Ar 6. (UO-128KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 8.11 1.847 85 age not evaluated "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 27, ENTRY 12" 9038 1 17.92 0.6 plagioclase conventional K-Ar 7. (UO-120KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 2.68 0.695 42 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-569, P. 27, ENTRY 13" 9039 1 16.09 0.9 whole rock conventional K-Ar 9. (UO-125KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 1.44 0.335 20 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 27, ENTRY 14" 9040 1 15.1 glass 10B. (KA-1029) "4.72E-04, 0.584E-04, 1.19E-04" 4.76 91 age of volcanism GLASS SHARDS EVERNDEN AND JAMES (1964) REPORTED A SIMILAR AGE FOR SANIDINE FROM A SIMILAR SAMPLE. 9041 1 13.45 0.6 whole rock conventional K-Ar 16. (UO-126KAR(11)) "4.72E-04, 0.585E-04, 1.19E-04*" 2.48 0.482 65 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 16" 9042 1 12.49 0.5 whole rock conventional K-Ar 18. (UO-130KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 1.48 0.267 45 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 17" 9043 1 11.54 0.6 whole rock conventional K-Ar 20. (UO-133KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 5.41 0.902 61 minimum age of volcanism GLASS SHARDS "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 18" 9044 1 8.9 sanidine conventional K-Ar 22B. (KA-1225) "4.72E-04, 0.584E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN EVERNDEN AND JAMES (1964) REPORTED THE SAME AGE FOR SANIDINE FROM A SIMILAR SAMPLE FROM THIS LOCALITY. 9045 1 11.12 1.2 whole rock conventional K-Ar 21. (UO-129KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 0.487 0.0782 7 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 14, ENTRY 44" 9046 1 8.77 1 sanidine conventional K-Ar 23. (UO-132KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 1.539 0.1947 22 age of volcanism 15% SANIDINE PLUS 85% PLAGIOCLASE "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 14, ENTRY 45" 9047 1 7.82 0.5 whole rock conventional K-Ar 24. (UO-123KAR) "4.72E-04, 0.585E-04, 1.19E-04*" 0.56 0.0632 26 age of volcanism "ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 19" 9048 1 30.77 1 whole rock conventional K-Ar RD62-62 "4.72E-04, 0.585E-04, 1.19E-04*" 1.12 0.5004 25 age of intrusion K=0.93% THIS AGE ALSO REPORTED BY DOTT (1971) 9049 1 104.63 10 biotite conventional K-Ar RD62-100 "4.72E-04, 0.585E-04, 1.19E-04*" 2.42 3.753 13 CHLORITE-BIOTITE MIXTURE K=2.01% THIS GRANITE IS PROBABLY OLDER THAN 150 M.Y. THIS AGE ALSO REPORTED BY DOTT (1971). 9049 2 113.91 25 biotite conventional K-Ar RD62-190 "4.72E-04, 0.585E-04, 1.19E-04*" 1.524 2.58 27 CHLORITE-BIOTITE MIXTURE K=1.265% THE GRANITE IS PROBABLY OLDER THAN 150 M.Y. THIS AGE ALSO REPORTED BY DOTT (1971). 9050 1 128.3 6 whole rock conventional K-Ar CS-1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.22 4.25 44 minimum age of metamorphic crystallization K=1.84% THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9051 1 141.87 10 whole rock conventional K-Ar 62-173 "4.72E-04, 0.585E-04, 1.19E-04*" 1.92 4.08 46 age of metamorphic crystallization K=1.595% THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9052 1 134.09 15 amphiboles conventional K-Ar 62-82 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0973 0.195 29 age of intrusion K=0.0808% THIS AGE ALSO REPORTED BY KOCH (1966) AND DOTT (1971). 9053 1 145 7 biotite conventional K-Ar ERR-1 "4.72E-04, 0.585E-04, 1.19E-04*" 3.43 7.456 46 age of intrusion K=2.85% THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9053 2 145 4 biotite conventional K-Ar ERR-1 "4.72E-04, 0.585E-04, 1.19E-04" 4.385 8.177 89 age of intrusion "(*), K=3.64%" THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9054 1 280.38 20 hornblende conventional K-Ar Q-11 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 4.804 24 K=0.91% THIS AGE IS THOUGHT TO BE ANOMALOUSLY OLD; THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9055 1 150 4 whole rock conventional K-Ar 18-25-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.22 0.4954 40 age of volcanism K=0.18% THIS AGE ALSO REPORTED BY DOTT(1971). 9056 1 155.8 12 hornblende conventional K-Ar CB-14 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 2.577 66 maximum age of intrusion K=0.915% THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9057 1 290.78 25 hornblende conventional K-Ar 35-B "4.72E-04, 0.585E-04, 1.19E-04*" 0.223 1.013 6 K=0.185% THIS AGE IS THOUGHT TO BE ANOMALOUSLY OLD; THIS AGE ALSO REPORTED BY KOCH (1966) AND BY DOTT (1971). 9058 1 218.79 5 whole rock conventional K-Ar 16-28-5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.43 1.44 32 K=0.36% THIS AGE IS THOUGHT TO BE ANOMALOUSLY OLD. THIS AGE ALSO REPORTED BY DOTT (1971). 9059 1 28.87 1 whole rock conventional K-Ar RHG "4.72E-04, 0.585E-04, 1.19E-04*" 3.89 1.63 35 age of intrusion K=3.23% THIS AGE ALSO REPORTED BY DOTT (1971). 9060 1 15.43 0.9 plagioclase conventional K-Ar 300 "4.72E-04, 0.584E-04, 1.19E-04*" 0.395 0.0881 63 age of volcanism MOST OF THIS INFORMATION CAME FROM ENGELS AND OTHERS (1976)--COMPILER THIS AGE ALSO REPORTED BY ENGELS AND OTHERS (1976). 9060 2 15.86 0.8 plagioclase conventional K-Ar 300 "4.72E-04, 0.584E-04, 1.19E-04*" 0.395 0.0906 66 age of volcanism MOST OF THIS INFORMATION CAME FROM ENGELS AND OTHERS (1976)--COMPILER THIS AGE ALSO REPORTED BY ENGELS AND OTHERS (1976) 9061 1 14.61 1 plagioclase conventional K-Ar 299. (OJW-64-01) "4.72E-04, 0.584E-04, 1.19E-04*" 0.467 0.0986 42 age of volcanism MOST OF THIS INFORMATION CAME FROM ENGELS AND OTHERS (1976)--COMPILER. THIS AGE ALSO REPORTED BY ENGELS AND OTHERS (1976). 9062 1 42.04 1.2 sanidine conventional K-Ar DAS-67-80 "4.72E-04, 0.585E-04, 1.19E-04*" 10.905 6.678 96 age of volcanism ABOUT 2% GLASS IMPURTIES "K20=10.90, 10.91% (ANALYTICAL DATA FROM WALKER, DALRYMPLE, AND LANPHERE, 1974)" "A 40AR/39AR AGE OF 43.1+/-0.6 M.Y. WAS REPORTED BY DALRYMPLE AND LANPHERE, 1974, FOR SANIDINE FROM THIS SAMPLE." 9063 1 37.36 1.1 sanidine conventional K-Ar DAS-66-208 "4.72E-04, 0.585E-04, 1.19E-04*" 5.78 3.141 85 age of volcanism "K20=5.77 5.79% (ANALYTICAL DATA FROM WALKER, DALRYMPLE, AND LANPHERE, 1974)" 9064 1 92.35 2.7 biotite conventional K-Ar T-152 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 12.36 94 "K20=9.06, 9.06% (ANALYTICAL DATA IS FROM ENGELS AND OTHERS, 1976--COMPILER)" THIS IS A REDUCED AGE 9064 2 100.91 3 hornblende conventional K-Ar T-152 "4.72E-04, 0.585E-04, 1.19E-04*" 1.2595 1.882 83 "K20=1.265, 1.254% (ANALYTICAL DATA IS FROM ENGELS AND OTHERS, 1976--COMPILER)" THIS IS A REDUCED AGE 9065 1 78.7 4 whole rock conventional K-Ar KA76-345 "4.72E-04, 0.585E-04, 1.19E-04" 4.53 11.78 9091 age of intrusion "(*), K=3.78, 3.74%; 40AR-RAD=2.65, 2.63XE-5 CC/GM" 9067 1 15.2 whole rock conventional K-Ar RO419 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 9068 1 10.6 whole rock conventional K-Ar R420 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 9069 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK1-1I "4.72E-04, 0.584E-04, 1.19E-04" 365 age of volcanism 11-POINT WHOLE-ROCK 40/36-39/36 AR ISOCHRON 9069 2 14.5 0.3 whole rock 39Ar-40Ar total fusion NK1-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.4913 47 age of volcanism CHUNKS OF SAMPLE SEE ARTICLE FOR ANALYTICAL DATA 9069 3 13.9 0.2 whole rock 39Ar-40Ar total fusion NK1-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.477 32 "12-200 MESH, MATERIAL IRRADIATED BEFORE GRINDING" SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS SOMEWHAT YOUNG. 9069 4 15 0.3 whole rock 39Ar-40Ar total fusion NK1-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.2838 40 12-200 MESH; MATERIAL IRRADIATED AFTER GRINDING SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS TOO OLD. 9070 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK11-2I "4.72E-04, 0.584E-04, 1.19E-04" 365 age of volcanism 11-POINT WHOLE-ROCK 40/36-39/36 AR ISOCHRON 9070 2 13.9 0.6 whole rock 39Ar-40Ar total fusion NK11-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2517 3 SEVERAL CHUNKS SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS A BIT YOUNG. 9070 3 16 0.7 whole rock 39Ar-40Ar total fusion NK11-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.1254 30 "12-200 MESH, MATERIAL IRRADIATED AFTER GRINDING" SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS TOO OLD. 9071 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 365 age of volcanism 11-POINT WHOLE-ROCK 40/36-39/36 AR ISOCHRON 9071 2 14.6 0.6 whole rock 39Ar-40Ar total fusion NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.1124 22 "12-200 MESH, MATERIAL IRRADIATED AFTER GRINDING" SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS SLIGHTLY OLDER. 9071 3 12.7 0.3 whole rock 39Ar-40Ar total fusion NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.0946 16 12-200 MESH; MATERIAL IRRADIATED BEFORE GRINDING SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS TOO YOUNG. 9071 4 22.1 2 whole rock conventional K-Ar NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.2454 7 ONE CHUNK BASALT IS 14.3 M.Y. OLD; THIS AGE IS MUCH TOO OLD. 9072 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK16-2I "4.72E-04, 0.584E-04, 1.19E-04" 365 age of volcanism 11-POINT WHOLE-ROCK 40/36-39/36 AR ISOCHRON "WATKINS AND BAKSI, 1974, REPORTED AN AGE OF 13.6 M.Y. FOR SIMILAR WHOLE-ROCK BASALT CORE." 9072 2 14.4 0.3 whole rock conventional K-Ar NK16-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2454 74 age of volcanism 12-200 MESH 9072 3 14.4 0.2 whole rock 39Ar-40Ar total fusion NK16-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2044 34 age of volcanism 12-200 MESH SEE ARTICLE FOR ANALYTICAL DATA 9073 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK11-1I "4.72E-04, 0.584E-04, 1.19E-04" 365 age of volcanism 11-POINT WHOLE-ROCK 40/36-39/36 AR ISOCHRON 9073 2 14.8 1.5 whole rock 39Ar-40Ar total fusion NK11-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.195 45 12-200 MESH SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD. 9073 3 13.8 0.7 whole rock 39Ar-40Ar total fusion NK11-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.2093 52 12-200 MESH SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD 9073 4 13.7 0.2 whole rock 39Ar-40Ar total fusion NK11-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.1236 27 12-200 MESH SEE ARTICLE FOR ANALYTICAL DATA BASALT IS 14.3 M.Y. OLD; THIS AGE IS TOO YOUNG. 9074 1 14 0.6 whole rock conventional K-Ar NK5-2 "4.72E-04, 0.584E-04, 1.19E-04" 0.29 36 age of volcanism 12-200 MESH WATKINS AND BAKSI (1974) REPORTED AN AGE OF 13.4 M.Y. FOR SIMILAR WHOLE-ROCK BASALT CORE. 9075 1 217.86 5 biotite conventional K-Ar 72FP69 "4.72E-04, 0.585E-04, 1.19E-04*" 7.73 25.77 96 age of intrusion "ANALYTICAL DATA FROM MARVIN AND COLE, 1978, P. 12, ITEM 70." "THIS AGE ALSO REPORTED IN USGS PROF. PAPER 1100, 1978, P. 74-75; AND BY BROOKS, MCINTYRE, AND WALKER, 1976, OREGON MAP SERIES-7; A RECALCULATED AGE OF 218 M.Y. (SAME SAMPLE) WAS REPORTED BY MARVIN AND COLE, 1978, P. 12, ITEM 70." 9076 1 261.8 13.9 hornblende 39Ar-40Ar incremental (plateau) OC-169 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE'S SUPPLEMENTARY MATERIAL FOR ANALYTICAL DATA; 40-39 TOTAL GAS AGE IS 259.6 M.Y. 9077 1 254.8 3.2 hornblende 39Ar-40Ar incremental (plateau) OC-306 "4.962E-04, 0.581E-04, 1.1167E-04" maximum age of intrusion SEE ARTICLE'S SUPPLEMENTARY MATERIAL FOR ANALYTICAL DATA; 40-39 TOTAL GAS AGE IS 250.9 M.Y. 9078 1 223 3.3 hornblende 39Ar-40Ar incremental (plateau) SP-206 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICL'ES SUPPLEMENTARY MATERIAL FOR ANALYTICAL DATA; 40-39 TOTAL GAS AGE IS 221.5 M.Y. 9078 2 212.1 biotite 39Ar-40Ar total fusion SP-206 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion SEE ARTICLE'S SUPPLEMENTARY MATERIAL FOR ANALYTICAL DATA 9079 1 223.2 5.5 hornblende 39Ar-40Ar incremental (plateau) SP-29OA "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE'S SUPPLEMENTARY MATERIAL FOR ANALYTICAL DATA; 40-39 TOTAL GAS AGE IS 220.2 M.Y. 9080 1 220.3 3.5 hornblende 39Ar-40Ar incremental (plateau) CP-136 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE'S SUPPLEMENTARY MATERIAL FOR ANALYTICAL DATA; 40-39 TOTAL GAS AGE IS 219.1 M.Y. 9081 1 153.03 4.6 hornblende conventional K-Ar GAL-10-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.588 1.352 87 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9082 1 142.71 3 hornblende conventional K-Ar GAL-11-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.163 0.3485 2625 minimum age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9083 1 154.77 4.6 hornblende conventional K-Ar GAL-12-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.49 1.14 75 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9083 2 154.64 4.6 biotite conventional K-Ar GAL-12-67 "4.72E-04, 0.585E-04, 1.19E-04*" 7.58 17.62 90 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9084 1 153.21 4.6 hornblende conventional K-Ar PP-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.422 0.9715 82 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9085 1 140.86 4.2 biotite conventional K-Ar WIM-8-67 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 19.11 92 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9086 1 138.89 4.2 hornblende conventional K-Ar GP-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.36 0.7483 81 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9087 1 152.94 4.6 hornblende conventional K-Ar OC-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.668 1.535 85 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9088 1 151.36 4.6 hornblende conventional K-Ar OC-2-67 "4.72E-04, 0.585E-04, 1.19E-04*" 1.04 2.364 88 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9088 2 141.64 4.3 biotite conventional K-Ar OC-2-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.9 18.88 57 age not evaluated ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9089 1 142.23 4.3 hornblende conventional K-Ar MED-3-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.582 1.24 69 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9089 2 145.22 4.4 biotite conventional K-Ar MED-3-67 "4.72E-04, 0.585E-04, 1.19E-04*" 6.77 14.74 89 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9090 1 137.07 4.1 hornblende conventional K-Ar MED-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.451 0.9247 84 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9090 2 141.27 4.2 biotite conventional K-Ar MED-1-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.39 17.75 89 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9091 1 163.75 3.5 hornblende conventional K-Ar ASH-7-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.716 1.767 87 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9091 2 169.42 3.5 hornblende conventional K-Ar ASH-7-67 "4.72E-04, 0.585E-04, 1.19E-04*" 0.716 1.831 78 age of intrusion ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9091 3 148.02 4.4 biotite conventional K-Ar ASH-7-67 "4.72E-04, 0.585E-04, 1.19E-04*" 8.92 19.81 74 age not evaluated ANALYTICAL DATA FROM M.A. LANPHERE--COMPILER 9092 1 162.34 7.9 hornblende conventional K-Ar 52-F35 no decay constants given* 0.092 0.225 age of intrusion 9093 1 151.58 7.4 hornblende conventional K-Ar 52-F82 no decay constants given* 0.128 0.2914 age of intrusion 9094 1 157.17 4.6 hornblende conventional K-Ar 52-F84 no decay constants given* 0.4 0.9457 age of intrusion 9095 1 138 5 whole rock conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 9102 1 554 16 hornblende conventional K-Ar SJ-13A "4.962E-04, 0.581E-04, 1.1167E-04" 0.343 3.207 78 maximum age of intrusion 9103 1 0.4 0.1 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" 3.51 age of volcanism K=2.91% 9104 1 0.4 0.2 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" 2.49 age of volcanism K=2.07% 9105 1 54.4 1.5 biotite conventional K-Ar A1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.73 6.94 91 age of volcanism 9106 1 54.69 2 biotite conventional K-Ar A2 "4.72E-04, 0.584E-04, 1.19E-04*" 6.28 5.02 85 AGE SEEMS A BIT TOO OLD AS SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9106 2 53.81 2.1 hornblende conventional K-Ar A2 "4.72E-04, 0.584E-04, 1.19E-04*" 1.1 0.865 75 AGE SEEMS A BIT TOO OLD AS SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9107 1 52.61 3 plagioclase conventional K-Ar A3 "4.72E-04, 0.584E-04, 1.19E-04*" 0.579 0.445 66 THE SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9108 1 53.34 1.7 biotite conventional K-Ar A4 "4.72E-04, 0.584E-04, 1.19E-04*" 8.16 6.36 94 THE SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9109 1 52.5 1.7 biotite conventional K-Ar A5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.97 6.11 88 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9109 2 49.61 3 plagioclase conventional K-Ar A5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.714 0.517 86 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9109 3 51.61 2.5 plagioclase conventional K-Ar A5 "4.72E-04, 0.584E-04, 1.19E-04*" 0.731 0.551 48 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9109 4 59.91 1.7 biotite conventional K-Ar A5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.97 6.99 88 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9109 5 53.58 1.8 biotite conventional K-Ar A5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 5.88 83 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9110 1 51.36 1.3 biotite conventional K-Ar A6 "4.72E-04, 0.584E-04, 1.19E-04*" 7.28 5.46 90 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9111 1 51.68 1.3 biotite conventional K-Ar A7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.32 6.28 94 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9111 2 52.35 1.8 hornblende conventional K-Ar A7 "4.72E-04, 0.584E-04, 1.19E-04*" 1.05 0.803 67 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD. 9112 1 52.37 1.4 hornblende conventional K-Ar A8 "4.72E-04, 0.584E-04, 1.19E-04*" 0.966 0.739 89 SANPOIL VOLCANICS ARE 50-51 M.Y. OLD 9113 1 42.33 2 hornblende conventional K-Ar A9 "4.72E-04, 0.584E-04, 1.19E-04*" 0.712 0.439 87 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD; THIS AGE IS TOO YOUNG. 9113 2 42.36 1.5 hornblende conventional K-Ar A9 "4.72E-04, 0.584E-04, 1.19E-04*" 0.713 0.44 76 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD; THIS AGE IS TOO YOUNG. 9114 1 47.51 1.7 hornblende conventional K-Ar A1O "4.72E-04, 0.584E-04, 1.19E-04*" 0.655 0.454 72 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD. 9114 2 49.05 1.9 hornblende conventional K-Ar A10 "4.72E-04, 0.584E-04, 1.19E-04*" 0.651 0.466 78 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD. 9114 3 47.7 1.9 hornblende conventional K-Ar A10 "4.72E-04, 0.584E-04, 1.19E-04*" 0.651 0.453 62 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD. 9115 1 50.29 1.7 biotite conventional K-Ar A11 "4.72E-04, 0.584E-04, 1.19E-04*" 8.24 6.05 86 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD. 9115 2 48.57 1.6 biotite conventional K-Ar A11 "4.72E-04, 0.584E-04, 1.19E-04*" 8.17 5.79 84 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD. 9115 3 49.35 1.4 biotite conventional K-Ar A11 "4.72E-04, 0.584E-04, 1.19E-04*" 8.01 5.77 89 KLONDIKE MOUNTAIN FORMATION IS 46 M.Y. OLD. 9116 1 52.9 1.6 biotite conventional K-Ar A12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.54 6.6 92 age of intrusion 9117 1 52.3 1.6 biotite conventional K-Ar A13 "4.72E-04, 0.584E-04, 1.19E-04*" 9.15 6.99 90 age of intrusion 9118 1 53.58 1.7 biotite conventional K-Ar A14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.2 6.42 96 age of intrusion 9118 2 55 2.7 hornblende conventional K-Ar A14 "4.72E-04, 0.584E-04, 1.19E-04*" 0.85 0.683 77 maximum age of intrusion 9119 1 53.6 1.5 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.609 0.4769 87 maximum age of intrusion "K20=0.613, 0.605%" 9120 1 50.7 1.1 K feldspar conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 15.005 11.1 81 age of intrusion "K20=15.03, 14.98%" 9120 2 49.8 1.1 K feldspar conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 15.005 10.9 82 age of intrusion "K20=15.03, 14.98%" 9121 1 51.2 1.7 biotite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 6.664 90 age of intrusion "K20=8.95, 8.87%" 9122 1 52.5 1.2 K feldspar conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 12.38 9.488 95 maximum age of intrusion K-FELDSPAR GRAINS ARE SLIGHTLY SERICITIZED AND CONTAIN INCLUSIONS. "K20=12.40, 12.36%" 9123 1 51.6 2 biotite conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 6.725 84 age of intrusion "K20=8.91, 8.95%" 9124 1 49.6 1.7 biotite conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 9.325 6.753 89 age of intrusion "K20=9.33, 9.32%" 9125 1 50.3 1.7 biotite conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 8.645 6.351 88 age of intrusion "K20=8.67, 8.62%" 9125 2 249 10 hornblende conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.135 4.355 95 "K20=1.13, 1.14%" A SPURIOUS AGE 9126 1 50.3 1.2 biotite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 8.865 6.517 816170 age of intrusion "K20=8.82, 8.91%; 40AR-RAD=6.416, 6.564, 6.573XE-10 MO1/GM." "AGE APPEARS IN DISCUSSION OF BEARPAW MOUNTAINS GRAVITY SLIDE BY GUCWA AND KEHLE, 1978." 9127 1 51.7 1.2 biotite conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 9.28 7.012 8387 age of intrusion "K20=9.42, 9.23, 9.20%; 40AR-RAD=7.059, 6.965XE-10 MOL/GM" "AGE APPEARS IN DISCUSSION OF BEARPAW MOUNTAINS GRAVITY SLIDE BY GUCWA AND KEHLE, 1978." 9128 1 50.8 1.2 biotite conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 9.565 7.092 8390 age of intrusion "K20=9.61, 9.53%; 40AR-RAD=7.130, 7.054XE-10 MOL/GM" "AGE APPEARS IN DISCUSSION OF BEARPAW MOUNTAINS GRAVITY SLIDE BY GUCWA AND KEHLE, 1978." 9129 1 51.3 1.7 biotite conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 9.585 7.177 94 age of intrusion "K20=9.61, 9.56%" 9130 1 51.1 1.8 biotite conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 7.49 5.588 70 age of intrusion K20=VALUE IS AVERAGE OF 6 ANALYSES 9130 2 49.1 1.2 K feldspar conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 12.41 8.896 93 age of intrusion "K20=12.44, 12.38%" 9131 1 50.4 1.7 biotite conventional K-Ar 12A "4.962E-04, 0.581E-04, 1.1167E-04" 8.425 6.203 87 age of intrusion "K20=8.41, 8.44%" 9132 1 53.1 1.8 hornblende conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 2.265 1.765 88 age of intrusion "K20=2.27, 2.26%" 9133 1 51.5 1.8 sanidine conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 6.965 5.236 92 age of intrusion "K20=7.00, 6.93%" 9134 1 52.5 1.8 sanidine conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 6.805 5.219 83 age of intrusion "K20=6.83, 6.78%" 9135 1 89.1 3 biotite conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 6.43 8.452 50 PROBABLY A MIXTURE OF AIR-FALL AND DETRITAL MICA "K20=6.40, 6.46%" THIS AGE IS TOO OLD. 9136 1 62.8 2.1 biotite conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 6.94 6.378 92 "K20=6.97, 6.97, 6.90, 6.89%" THIS AGE IS SPURIOUS 9137 1 53 1.8 biotite conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.13 6.289 88 age of volcanism "K20=8.20, 8.10, 8.09%" 9138 1 51 1.7 biotite conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 8.535 6.36 80 age of volcanism "K20=8.53, 8.54%" 9138 2 51.5 1.1 hornblende conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.253 0.9428 90 age of volcanism "K20=1.253, 1.253%" 9139 1 53.5 2 biotite conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 8.555 6.69 84 age of volcanism "K20=8.58, 8.53%" 9140 1 56 1.9 biotite conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 8.555 7.011 92 maximum age of volcanism "K20=8.54, 8.57%" THIS AGE IS PROBABLY A BIT TOO OLD. 9141 1 53.9 2.7 biotite conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 8.52 6.705 86 age of volcanism 9142 1 51 2.6 biotite conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 9.23 6.88 81 minimum age of intrusion 9143 1 53.4 2 biotite conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 9.195 7.174 85 age of intrusion "K20=9.23, 9.16" 9144 1 50 1.9 biotite conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 9.625 7.03 89 age of intrusion "K20=9.61, 9.64%" 9145 1 51.5 2.6 biotite conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 9.52 7.156 75 age of intrusion 9145 2 53.9 2.7 K feldspar conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 14.6 11.51 94 maximum age of intrusion 9146 1 50.5 2.5 biotite conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 9.74 7.181 72 age of intrusion 9146 2 52.9 2.6 K feldspar conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 14.44 11.16 91 maximum age of intrusion 9147 1 50.9 2.5 sericite conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 11.47 8.532 81 age of intrusion 9147 2 52.2 2.6 K feldspar conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 14.02 10.68 78 maximum age of intrusion 9148 1 48.5 2.4 sericite conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 11.36 8.031 79 "K20=11.32, 11.31, 11.44%" THIS AGE APPEARS SOMEWHAT YOUNG; SYENITE PROBABLY FORMED 51-52 M.Y. AGO. 9149 1 51.9 2.6 pseudolucite conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" 13.55 10.26 55 age of intrusion "K20=13.66, 13.57, 13.42%" 9150 1 48.4 2.4 biotite conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 9.11 6.43 80 SYENITE LENS PROBABLY FORMED 51 M.Y. AGO 9150 2 53.3 2.7 K feldspar conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 14.85 11.56 93 SYENITE LENS PROBABLY FORMED 51 M.Y. AGO. 9151 1 50.8 1.8 biotite conventional K-Ar 32 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 6.799 82 age of intrusion "K2O=9.19, 9.13%" 9152 1 51.3 2 biotite conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 9.065 6.786 85 age of intrusion "K2O=9.06, 9.07%" 9153 1 49.9 1.7 biotite conventional K-Ar 34 "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 6.527 88 age of intrusion "K2O=8.94, 8.98%" 9154 1 39.5 2 pseudolucite conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 13.9 7.981 71 "K2O=14.04, 13.95, 14.02, 13.61%" "THIS AGE IS SPURIOUS, TOO YOUNG." 9154 2 39.9 2 pseudolucite conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 13.9 8.081 74 "K2O=14.04, 13.95, 14.02, 13.61%" "THIS AGE IS SPURIOUS, TOO YOUNG." 9155 1 31.1 0.7 pseudolucite conventional K-Ar 36 "4.962E-04, 0.581E-04, 1.1167E-04" 13.145 5.941 72 "K2O=13.17, 13.12%" "THIS AGE IS SPURIOUS, TOO YOUNG." 9156 1 54.1 1.2 sanidine conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 10.185 8.051 88 maximum age of intrusion "K2O=10.19, 10.18%" THIS AGE APPEARS A BIT TOO OLD; EXCESS ARGON MAY BE PRESENT. 9156 2 57.7 1.8 biotite conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 8.18 6.903 87 "K2O=8.18, 8.18%" THIS AGE APPEARS TOO OLD; EXCESS ARGON IS PROBABLY PRESENT. 9157 1 51.5 1.8 sanidine conventional K-Ar 38 "4.962E-04, 0.581E-04, 1.1167E-04" 7.49 5.638 37 age of intrusion "K2O=7.49, 7.49%" 9158 1 50.3 1.7 biotite conventional K-Ar 39 "4.962E-04, 0.581E-04, 1.1167E-04" 6.82 5.01 71 age of intrusion "K2O=6.79, 6.82, 6.84%" 9159 1 54.4 1.9 hornblende conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 1.65 1.312 88 "K2O=1.65, 1.65%" THIS AGE MAY BE SLIGHTLY TOO OLD FOR THE TIME OF INTRUSION. 9160 1 51.5 1.8 andesine conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 5.19 3.9 79 age of intrusion "80-150 MESH FRACTION OF 2.60-2.625 S.G., SANIDINE PROBABLY CONTAINS SOME BARIUM." "K2O=5.16, 5.22%" 9160 2 57.8 2 plagioclase conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 2.4 2.03 72 IMPURE PLAGIOCLASE "K2O=2.39, 2.43, 2.37, 2.42%" THIS AGE IS TOO OLD 9161 1 61 2.1 K feldspar conventional K-Ar 42 "4.962E-04, 0.581E-04, 1.1167E-04" 8.085 7.219 94 age of intrusion "K2O=8.12, 8.05%" 9162 1 59.6 1.4 K feldspar conventional K-Ar 43 "4.962E-04, 0.581E-04, 1.1167E-04" 11.755 10.26 94 minimum age of intrusion "K2O=11.68, 11.83%" THE PLUTON MAY HAVE FORMED ABOUT 64 M.Y. AGO. 9162 2 107 2 hornblende conventional K-Ar 43 "4.962E-04, 0.581E-04, 1.1167E-04" 1.8865 2.98 94 "K2O=1.885, 1.888% BY ISOTOPE DILUTION" A SPURIOUS AGE 9163 1 61.8 1.5 K feldspar conventional K-Ar 44 "4.962E-04, 0.581E-04, 1.1167E-04" 10.25 9.28 96 age of intrusion "K2O=10.22, 10.28%" 9163 2 89.9 2 hornblende conventional K-Ar 44 "4.962E-04, 0.581E-04, 1.1167E-04" 1.643 2.18 95 "K2O=1.648, 1.638% BY ISOTOPE DILUTION" A SPURIOUS AGE 9164 1 63.5 1.5 K feldspar conventional K-Ar 45 "4.962E-04, 0.581E-04, 1.1167E-04" 12.675 11.79 75 "K2O=12.69, 12.66%" APPARENT AGE MAY DATE THE TIME OF HYDROTHERMAL ACTIVITY. 9165 1 63.9 1.5 K feldspar conventional K-Ar 46 "4.962E-04, 0.581E-04, 1.1167E-04" 10.225 9.58 87 "K2O=10.20, 10.25%" APPARENT AGE MAY DATE THE TIME OF HYDROTHERMAL ACTIVITY. 9166 1 62.4 1.4 K feldspar conventional K-Ar 47 "4.962E-04, 0.581E-04, 1.1167E-04" 13.585 12.42 83 "K20=13.60, 13.57%" THIS AGE MAY BE A MINIMUM AGE FOR THE HYDROTHERMAL ACTIVITY. 9167 1 62.5 1.8 K feldspar conventional K-Ar 48 "4.962E-04, 0.581E-04, 1.1167E-04" 11.14 10.2 94 minimum age of intrusion "K2O=11.10, 11.18%" PLUTON MAY HAVE FORMED ABOUT 64-67 M.Y. AGO. 9168 1 67.2 1.5 K feldspar conventional K-Ar 49 "4.962E-04, 0.581E-04, 1.1167E-04" 10.725 10.57 91 age of intrusion "K2O=10.74, 10.71%" 9169 1 64.1 1.5 sanidine conventional K-Ar 50 "4.962E-04, 0.581E-04, 1.1167E-04" 8.395 7.89 70 "K2O=8.38, 8.41%" LACCOLITH PROBABLY FORMED 66 M.Y. AGO 9170 1 65.8 1.6 sanidine conventional K-Ar 51 "4.962E-04, 0.581E-04, 1.1167E-04" 9.155 8.838 90 "K2O=9.14, 9.17%" LACCOLITH PROBABLY FORMED 66 M.Y. AGO. 9174 1 66 1.5 sanidine conventional K-Ar 55 "4.962E-04, 0.581E-04, 1.1167E-04" 11.905 11.53 85 "K2O=11.85, 11.96%" SILL PROBABLY FORMED ABOUT 65 M.Y. AGO. 9175 1 64.2 1.5 sanidine conventional K-Ar 56 "4.962E-04, 0.581E-04, 1.1167E-04" 10.4 9.787 94 age of intrusion "K2O=10.41, 10.39%" 9176 1 64.4 1.5 sanidine conventional K-Ar 57 "4.962E-04, 0.581E-04, 1.1167E-04" 10.33 9.749 79 age of intrusion "K2O=10.32, 10.34%" 9177 1 63.8 2.2 K feldspar conventional K-Ar 58 "4.962E-04, 0.581E-04, 1.1167E-04" 7.41 0.6925 90 "K2O=7.34, 7.48%" THIS ROCK PROBABLY FORMED 69-68 M.Y. AGO. 9177 2 65.7 1.8 oligoclase conventional K-Ar 58 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.6067 70 "K2O=0.632, 0.628%" THIS ROCK PROBABLY FORMED 69-68 M.Y. AGO. 9177 3 76.9 2.9 hornblende conventional K-Ar 58 "4.962E-04, 0.581E-04, 1.1167E-04" 1.345 1.522 87 "K2O=1.35, 1.34%" THIS ROCK PROBABLY FORMED 69-68 M.Y. AGO; THIS HORNBLENDE AGE IS SPURIOUS. 9178 1 62.3 1.4 K feldspar conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 10.75 9.809 87 "K2O=10.75, 10.75%" THIS ROCK PROBABLY FORMED 67 M.Y. AGO. 9178 2 129 4 hornblende conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 0.454 0.8767 89 "K20=0.453, 0.455%" THIS IS A SPURIOUS AGE 9179 1 60.4 2.1 orthoclase conventional K-Ar 59A "4.962E-04, 0.581E-04, 1.1167E-04" 6.28 5.551 81 "K2O=6.30, 6.26%" THIS PLUTON FORMED AROUND 67 M.Y. AGO. 9180 1 60.7 2 K feldspar conventional K-Ar 60 "4.962E-04, 0.581E-04, 1.1167E-04" 9.29 8.249 86 "K2O=9.31, 9.27%" THIS PLUTON PROBABLY FORMED ABOUT 67 M.Y. AGO; THIS AGE IS TOO YOUNG. 9181 1 53.7 1.2 K feldspar conventional K-Ar 61 "4.962E-04, 0.581E-04, 1.1167E-04" 14.495 11.37 92 "K2O=14.60, 14.39%" THIS AGE IS TOO YOUNG; SILL PROBABLY FORMED ABOUT 65 M.Y. AGO. 9182 1 33.4 0.7 K feldspar conventional K-Ar 62 "4.962E-04, 0.581E-04, 1.1167E-04" 10.785 5.238 85 "K2O=10.82, 10.75%" THIS AGE IS SPURIOUS; GRANITE PROBABLY FORMED ABOUT 62 M.Y. AGO. 9182 2 58.4 1.3 plagioclase conventional K-Ar 62 "4.962E-04, 0.581E-04, 1.1167E-04" 1.2385 1.059 78 minimum age of intrusion "K2O=1.237, 1.240%" GRANITE PROBABLY FORMED ABOUT 62 M.Y. AGO. 9183 1 58.8 2.1 roscolite conventional K-Ar 63 "4.962E-04, 0.581E-04, 1.1167E-04" 9.375 8.12 93 ROSCOLITE PLUS 5-15% CHLORITE "K=9.39, 9.36%" AGE PROBABLY REPRESENTS THE TIME OF MINERALIZATION. 9183 2 59.2 2.1 roscoelite conventional K-Ar 63 "4.962E-04, 0.581E-04, 1.1167E-04" 9.375 8.065 95 ROSCOELITE PLUS 5-15% CHLORITE "K2O=9.39, 9.36%" AGE PROBABLY REPRESENTS THE TIME OF MINERALIZATION. 9184 1 46.7 1.6 K feldspar conventional K-Ar 64 "4.962E-04, 0.581E-04, 1.1167E-04" 4.865 3.313 87 age of intrusion "K2O=4.91, 4.82%" 9185 1 48.2 1.8 phlogopite conventional K-Ar 65 "4.962E-04, 0.581E-04, 1.1167E-04" 8.725 6.148 87 age of intrusion "K2O=8.74, 8.71%" 9186 1 48.4 1.9 phlogopite conventional K-Ar 66 "4.962E-04, 0.581E-04, 1.1167E-04" 7.65 5.404 85 age of intrusion COARSE-GRAINED PHLOGOPITE "K2O=7.63, 7.67%" 9187 1 48.4 2 phlogopite conventional K-Ar 67 "4.962E-04, 0.581E-04, 1.1167E-04" 7.71 5.445 85 age of intrusion "K2O=7.70, 7.72%" 9188 1 50.6 2 phlogopite conventional K-Ar 68 "4.962E-04, 0.581E-04, 1.1167E-04" 8.21 6.059 88 age of intrusion "K2O=8.25, 8.17%" 9189 1 48.8 1.8 phlogopite conventional K-Ar 69 "4.962E-04, 0.581E-04, 1.1167E-04" 9.215 6.564 86 age of intrusion COARSE-GRAINED PHLOGOPITE "K2O=9.20, 9.23%" 9190 1 46.7 1.6 phlogopite conventional K-Ar 70 "4.962E-04, 0.581E-04, 1.1167E-04" 9.445 6.426 82 age of intrusion "K2O=9.46, 9.43%" 9191 1 47.9 1.6 phlogopite conventional K-Ar 71 "4.962E-04, 0.581E-04, 1.1167E-04" 9.66 6.757 82 age of intrusion "K2O=9.64, 9.68%" 9192 1 399 14 phlogopite conventional K-Ar 72 "4.962E-04, 0.581E-04, 1.1167E-04" 8.385 53.89 90 +28 MESH "K2O=8.37, 8.40%" THIS AGE IS SPURIOUS; EXCESS ARGON IS PROBABLY PRESENT. 9192 2 166 6 phlogopite conventional K-Ar 72 "4.962E-04, 0.581E-04, 1.1167E-04" 7.58 18.92 95 -100+150 MESH "K2O=7.59, 7.57%" THIS AGE IS SPURIOUS; EXCESS ARGON IS PROBABLY PRESENT. 9193 1 47.5 1.6 phlogopite conventional K-Ar 73 "4.962E-04, 0.581E-04, 1.1167E-04" 8.145 5.644 88 minimum age of intrusion "K2O=8.14, 8.15%" 9194 1 52 1.9 phlogopite conventional K-Ar 74 "4.962E-04, 0.581E-04, 1.1167E-04" 8.905 6.766 84 age of intrusion "K2O=8.87, 8.94%" 9195 1 50.8 1.9 phlogopite conventional K-Ar 75 "4.962E-04, 0.581E-04, 1.1167E-04" 8.82 6.554 88 age of intrusion "K2O=8.82, 8.82%" 9196 1 78.6 2.7 phlogopite conventional K-Ar 76 "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 10.83 91 "K2O=9.35, 9.37%" A SPURIOUS AGE; PIPE IS PROBABLY EOCENE IN AGE. 9197 1 50.2 1.1 biotite conventional K-Ar 77 "4.962E-04, 0.581E-04, 1.1167E-04" 6.125 4.494 78 age of intrusion "K2O=6.12, 6.13%" 9198 1 27 3 biotite conventional K-Ar 78 "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 3.278 62 age of intrusion 9199 1 67 3 sanidine conventional K-Ar 79 "4.962E-04, 0.581E-04, 1.1167E-04" 12 11.73 97 THIS AGE DOES NOT DATE THE LEBO MEMBER; THE SANIDINE MAY HAVE COME FROM TUFFS IN OR NEAR THE LITTLE ROCKY MOUNTAINS. 9200 1 34.23 1.3 biotite conventional K-Ar 11. (PC-392) "4.72E-04, 0.584E-04, 1.19E-04*" 8.855 4.406 78 age of intrusion "K20=8.84, 8.87%" 9201 1 27 biotite conventional K-Ar KA11 "4.83E-04, 0.585E-04" 8.97 40 BIOTITE IS ALTERED K=7.45% (AVERAGE OF REPLICATE ANALYSES) AGE APPEARS TOO OLD 9201 2 25.1 biotite conventional K-Ar KA11 "4.83E-04, 0.585E-04" 8.55 69 K=7.10% (AVERAGE OF REPLICATE ANALYSES) AGE APPEARS TOO OLD 9202 1 3.44 0.44 glass conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 3.63 0.1797 16 age of volcanism 9203 1 4.55 0.18 biotite conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 6.81 0.4466 40 age of volcanism 9204 1 2.2 0.1 whole rock conventional K-Ar 14A (MB-110) "4.72E-04, 0.584E-04, 1.19E-04*" 0.451 0.0143 93129 age of volcanism "K=0.374%; RAD40AR=0.0295, 0.0335, 0.0332XE-6 CC/GM" 9246 1 28.6 0.9 K feldspar conventional K-Ar 46. S-9 "4.962E-04, 0.581E-04, 1.1167E-04" 6.24 2.59 50 minimum age of volcanism 9247 1 21.7 0.7 K feldspar conventional K-Ar 45. S-7 "4.962E-04, 0.581E-04, 1.1167E-04" 5.85 1.84 58 AGE TOO YOUNG. TUFF PROBABLY AROUND 25 M.Y. OLD. 9248 1 27.6 0.8 biotite conventional K-Ar 44. S-6 "4.962E-04, 0.581E-04, 1.1167E-04" 7.77 3.106 37 age of volcanism 9248 2 29.1 0.9 plagioclase conventional K-Ar 44. S-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.181 0.4981 50 age of volcanism 9249 1 0.77 0.8 barite conventional K-Ar 43. C3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1 0.0011 0 AGE IS TOO YOUNG 9250 1 85.2 1 muscovite conventional K-Ar 42. LPI-AD "4.962E-04, 0.581E-04, 1.1167E-04" 10.04 12.62 68 AGE OF MINERALIZATION 9251 1 19.5 0.5 K feldspar conventional K-Ar 41. AD-SSAD "4.962E-04, 0.581E-04, 1.1167E-04" 2.353 0.6684 18 AGE OF MINERALIZATION 9252 1 56.2 0.8 muscovite conventional K-Ar 1.M79PR-171 "4.962E-04, 0.581E-04, 1.1167E-04" 10.62 8.729 79 "K2O=10.63, 10.66, 10.59, AND 10.60%" THIS IS A HYBRID AGE. DIKE IS PROBABLY CRETACEOUS IN AGE 9253 1 30.1 0.5 biotite conventional K-Ar 2.M79PR-21 "4.962E-04, 0.581E-04, 1.1167E-04" 9.125 3.978 6971 "K2O=9.13, 9.16, 9.11, AND 9.10%; 40AR-RAD=4.080, 3.876XE-10 MOL/GM" THIS IS A REDUCED AGE. DIKE MAY BE CRETACEOUS IN AGE. 9254 1 91.2 1.5 hornblende conventional K-Ar 3.M79PR-85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.898 1.21 68 minimum age of intrusion "K2O=0.898, 0.900, 0.899, 0.896%" 9254 2 27.1 0.5 biotite conventional K-Ar 3. M79PR-85 "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 3.518 6967 "K2O=8.96, 8.98, 8.96, 8.95%; 40AR-RAD=3.546, 3.490XE-10 MOL/GM" A REDUCED AGE 9255 1 36.6 0.5 biotite conventional K-Ar 4. M79PR-116 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 4.565 84 age of intrusion "K2O=8.60, 8.57, 8.58, 8.57%" 9258 1 2090 70 biotite conventional K-Ar 4346A "4.962E-04, 0.581E-04, 1.1167E-04" 8.03 454.7 99 THIS IS A REDUCED AGE 9261 1 2415 96 hornblende conventional K-Ar 4352B "4.962E-04, 0.581E-04, 1.1167E-04" 0.909 66.44 96 THIS AGE IS TO YOUNG 9265 1 2480 80 biotite conventional K-Ar 9382 "4.962E-04, 0.581E-04, 1.1167E-04" 8.83 677.45 99 "40AR-RAD=675.7, 677.2XE-10 MOL/GM" THIS IS A REDUCED AGE. 9273 1 0.82 0.04 whole rock conventional K-Ar 2. AWL-41-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.864 0.0103 24 age of volcanism "K=0.717%; 40AR-RAD=1.01, 1.04XE-12 MOL/GM." INTERPRETATION SEEMS QUESTIONABLE 9274 1 3.06 0.08 whole rock conventional K-Ar 3. AWL-42-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.925 0.0408 47 age of volcanism "K=0.768%; 40AR-RAD=4.16, 4.00XE-12 MOL/GM." INTERPRETATION SEEMS QUESTIONABLE 9275 1 27.67 0.59 whole rock conventional K-Ar 4. DI-4-74 "4.962E-04, 0.581E-04, 1.1167E-04" 2.1 0.0408 47 age of intrusion PYROXENE PHENOCRYSTS REMOVED "K=1.74%; 40AR-RAD=4.16, 4.00XE-12 MOL/GM." 9276 1 1.41 0.29 whole rock conventional K-Ar 5. FL-3-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.455 0.0093 8 age of volcanism "K=0.378%; 40AR-RAD=0.87, 0.98XE-12 MOL/GM" 9277 1 0.7 0.55 whole rock conventional K-Ar 6. BR-2-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.478 0.0048 1 age of volcanism K=0.397%; ARGON VALUE IS AVERAGE OF 6 DETERMINATIONS 9278 1 0.2 0.04 whole rock conventional K-Ar 7. B-1-74 "4.962E-04, 0.581E-04, 1.1167E-04" 1.32 0.0038 7 age of volcanism "K=1.096%; 40AR-RAD=0.339, 0.362, 0.433XE-12 MOL/GM" 9279 1 1.57 0.26 whole rock conventional K-Ar 8. AWL-2-77 "4.962E-04, 0.581E-04, 1.1167E-04" 0.777 0.0176 5 age of volcanism "K=0.645%; 40AR-RAD=1.79, 1.78, 1.72XE-12 MOL/GM." 9280 1 950.7 19.7 whole rock conventional K-Ar 9. ACE-8-75-12 "4.962E-04, 0.581E-04, 1.1167E-04" 2.325 41.67 minimum age of intrusion "K=1.93%; 40AR-RAD=41.668, 41.67XE-10 MOL/GM" 9281 1 9.04 0.86 whole rock conventional K-Ar C-318-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.158 28 age of volcanism 9282 1 9.86 0.72 whole rock conventional K-Ar C-318-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.186 36 age of volcanism 9283 1 8.04 0.38 whole rock conventional K-Ar C-1445-8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.194 57 age of volcanism 9284 1 12.55 0.59 whole rock conventional K-Ar C-1445-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.438 59 age of volcanism 9285 1 1.28 0.4 whole rock conventional K-Ar C-342-5A "4.962E-04, 0.581E-04, 1.1167E-04" 0.025 9 age of volcanism 9286 1 1 0.16 whole rock conventional K-Ar C-1730-9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.018 17 age of volcanism 9287 1 0.94 0.14 whole rock conventional K-Ar C-1730-8A "4.962E-04, 0.581E-04, 1.1167E-04" 0.015 19 age of volcanism 9288 1 1.11 0.11 whole rock conventional K-Ar C-346-33 "4.962E-04, 0.581E-04, 1.1167E-04" 0.052 29 age of volcanism 9289 1 1.06 0.28 whole rock conventional K-Ar C-311-34 "4.962E-04, 0.581E-04, 1.1167E-04" 0.02 10 age of volcanism 9290 1 1.09 0.34 whole rock conventional K-Ar IHH273-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.02 8 age of volcanism 9291 1 0.8 0.24 whole rock conventional K-Ar C-350-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.014 9 age of volcanism 9292 1 21.2 1.12 whole rock conventional K-Ar IHH271-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.746 68 age of volcanism 9293 1 4.22 whole rock conventional K-Ar 830-15 "4.72E-04, 0.585E-04, 1.19E-04" 0.0298 5 LESS THAN 10% GLASS PRESENT "K=0.406, 0.386%" AGE IS TOO OLD 9294 1 3.62 whole rock conventional K-Ar 830-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.0308 6 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.478, 0.487%" 9295 1 3.68 whole rock conventional K-Ar 829-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.0333 7 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.508, 0.502%" 9296 1 3.67 whole rock conventional K-Ar 829-12 "4.72E-04, 0.585E-04, 1.19E-04" 0.0315 6 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.483, 0.480%" 9297 1 2.43 whole rock conventional K-Ar 827-15 "4.72E-04, 0.585E-04, 1.19E-04" 0.0113 4 ABOUT 15% GLASS PRESENT "K=0.271, 0.252%" AGE IS TOO YOUNG 9298 1 3.7 whole rock conventional K-Ar 826-15 "4.72E-04, 0.585E-04, 1.19E-04" 0.034 17 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.501, 0.523%" 9299 1 8.3 2.4 whole rock conventional K-Ar 1. 77-9-30-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.58 0.069 10 age of volcanism 9300 1 9.9 1 whole rock conventional K-Ar 2. 78-6-7-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.085 22 age of volcanism 9301 1 13.5 2.8 whole rock conventional K-Ar 3. 76-4-15-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.71 0.143 13 age of volcanism 9302 1 15.9 0.9 whole rock conventional K-Ar 4. 77-9-26-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.11 0.256 59 age of intrusion 9303 1 17.3 0.8 whole rock conventional K-Ar 5. 77-9-4-2B "4.962E-04, 0.581E-04, 1.1167E-04" 5.19 1.3 74 age of volcanism 9304 1 20.7 3.5 whole rock conventional K-Ar 6. 77-9-29-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.18 0.054 17 age of volcanism 9305 1 7.8 0.7 whole rock conventional K-Ar 7. 78-5-25-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.17 0.132 20 age of volcanism 9306 1 7.9 0.5 whole rock conventional K-Ar 8. 78-6-2-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.103 54 age of volcanism 9307 1 7.6 0.4 whole rock conventional K-Ar 9. 77-9-17-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.8 0.197 67 age of volcanism 9308 1 7.8 0.5 whole rock conventional K-Ar 10. 77-9-2-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 0.12 46 age of volcanism 9309 1 2.8 0.7 whole rock conventional K-Ar 11. 77-9-1-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.05 0.084 10 age of volcanism 9310 1 2.8 0.5 whole rock conventional K-Ar 12. 78-6-3-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.2 0.089 14 age of volcanism 9311 1 3.1 1 whole rock conventional K-Ar 13. 77-8-28-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 0.058 8 age of volcanism 9312 1 2.94 0.14 whole rock conventional K-Ar 1. AWL-40-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.831 0.0352 20 age of volcanism "K=0.690%; 40AR-RAD=3.37, 3.45, 3.73XE-12 MOL/GM." 9337 1 310 5 biotite 39Ar-40Ar total fusion 1 "4.72E-04, 0.585E-04, 1.19E-04" 93 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9338 1 317 5 biotite 39Ar-40Ar total fusion 2 "4.72E-04, 0.585E-04, 1.19E-04" 91 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9338 2 351 5 hornblende 39Ar-40Ar total fusion 2 "4.72E-04, 0.585E-04, 1.19E-04" 68 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9339 1 311 5 biotite 39Ar-40Ar total fusion 3 "4.72E-04, 0.585E-04, 1.19E-04" 90 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9339 2 355 5 hornblende 39Ar-40Ar total fusion 3 "4.72E-04, 0.585E-04, 1.19E-04" 81 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9340 1 296 5 biotite 39Ar-40Ar total fusion 4 "4.72E-04, 0.585E-04, 1.19E-04" 95 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9340 2 326 5 hornblende 39Ar-40Ar total fusion 4 "4.72E-04, 0.585E-04, 1.19E-04" 85 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9340 3 315.68 7 hornblende conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 1.112 5.523 93 K=0.923% A COOLING AGE 9341 1 299 5 biotite 39Ar-40Ar total fusion 5 "4.72E-04, 0.585E-04, 1.19E-04" 93 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9341 2 323 5 hornblende 39Ar-40Ar total fusion 5 "4.72E-04, 0.585E-04, 1.19E-04" 81 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9341 3 307 7 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 9.316 44.94 86 K=7.733% A COOLING AGE 9342 1 318 5 hornblende 39Ar-40Ar total fusion 6 "4.72E-04, 0.585E-04, 1.19E-04" 62 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9342 2 326.53 8 hornblende conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 0.378 1.948 64 K=0.314% A COOLING AGE 9343 1 300 5 biotite 39Ar-40Ar total fusion 7 "4.72E-04, 0.585E-04, 1.19E-04" 92 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9344 1 290 5 biotite 39Ar-40Ar total fusion 8 "4.72E-04, 0.585E-04, 1.19E-04" 92 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9344 2 307 5 hornblende 39Ar-40Ar total fusion 8 "4.72E-04, 0.585E-04, 1.19E-04" 82 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9345 1 284 5 biotite 39Ar-40Ar total fusion 9 "4.72E-04, 0.585E-04, 1.19E-04" 89 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9345 2 308 5 hornblende 39Ar-40Ar total fusion 9 "4.72E-04, 0.585E-04, 1.19E-04" 84 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9345 3 315.08 7 hornblende conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 1.218 6.037 83 K=1.011% A COOLING AGE 9346 1 261 5 biotite 39Ar-40Ar total fusion 10 "4.72E-04, 0.585E-04, 1.19E-04" 82 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9346 2 271 6 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 9.442 39.79 82 K=7.838% A COOLING AGE 9347 1 300 5 hornblende 39Ar-40Ar total fusion 11 "4.72E-04, 0.585E-04, 1.19E-04" 72 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9348 1 250 5 biotite 39Ar-40Ar total fusion 12 "4.72E-04, 0.585E-04, 1.19E-04" 91 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9348 2 259 7 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 9.566 38.43 60 K=7.941% A COOLING AGE 9349 1 244 5 biotite 39Ar-40Ar total fusion 13 "4.72E-04, 0.585E-04, 1.19E-04" 92 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9350 1 236 5 biotite 39Ar-40Ar total fusion 14 "4.72E-04, 0.585E-04, 1.19E-04" 95 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA A COOLING AGE 9351 1 283 5 muscovite 39Ar-40Ar total fusion (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 94 minimum age of intrusion SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA "WHITNEY, JONES, AND WALKER (1976) REPORTED AN AGE OF 291 M.Y. FOR THIS PLUTON" 9351 2 281 5 biotite 39Ar-40Ar total fusion (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 78 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA "WHITNEY, JONES, AND WALKER (1976) REPORTED AN AGE OF 291 M.Y. FOR THIS PLUTON." 9374 1 332.84 10 muscovite conventional K-Ar K-12M "4.72E-04, 0.584E-04, 1.19E-04*" 8.25 43.415 K=6.85% A COOLING AGE 9375 1 380.12 11 biotite conventional K-Ar K-16B "4.72E-04, 0.584E-04, 1.19E-04*" 10.13 61.71 K=8.41% A COOLING AGE 9375 2 372.16 11 biotite conventional K-Ar K-16B "4.72E-04, 0.584E-04, 1.19E-04*" 10.13 60.28 K=8.41% A COOLING AGE 9376 1 317 9 biotite conventional K-Ar K-24B "4.72E-04, 0.584E-04, 1.19E-04*" 9.53 47.51 age not evaluated K=7.91% 9377 1 291.2 9 biotite conventional K-Ar K-30B "4.72E-04, 0.584E-04, 1.19E-04*" 9.66 43.95 minimum age of intrusion K=8.02% 9378 1 259.06 8 biotite conventional K-Ar K-32B "4.72E-04, 0.584E-04, 1.19E-04*" 10.28 41.23 age not evaluated K=8.53% 9379 1 304.65 9 biotite conventional K-Ar K-35B "4.72E-04, 0.584E-04, 1.19E-04*" 7.48 35.74 minimum age of intrusion K=6.21% 9380 1 265.84 8 whole rock conventional K-Ar K-36B "4.72E-04, 0.584E-04, 1.19E-04*" 8.57 35.34 K=7.11% A COOLING AGE 9381 1 267.91 8 whole rock conventional K-Ar K-37B "4.72E-04, 0.584E-04, 1.19E-04*" 8.53 35.47 K=7.08% A COOLING AGE 9382 1 300.82 9 muscovite conventional K-Ar K-61M "4.72E-04, 0.584E-04, 1.19E-04*" 9.44 44.49 K=7.84% A COOLING AGE 9383 1 294.2 9 biotite conventional K-Ar K-72B "4.72E-04, 0.584E-04, 1.19E-04*" 9.01 41.45 K=7.48% A COOLING AGE 9389 1 375 20 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN A COOLING AGE 9390 1 355 20 hornblende conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN A COOLING AGE. 9391 1 430 25 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "A COOLING AGE. DALLMEYER, 1975, REPORTS A RECALCULATED AGE OF 411 M.Y. FOR THIS SAMPLE (W-4)." 9392 1 320 15 biotite conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN A COOLING AGE 9393 1 300 15 biotite conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 9397 1 360 15 biotite conventional K-Ar B3173 "4.72E-04, 0.577E-04" 8.19 K=6.8% GRANITE PLUTON MAY BE AROUND 300 M.Y. OLD. 9398 1 330 20 biotite conventional K-Ar B3174 "4.72E-04, 0.577E-04" 5.06 K=4.2% A COOLING AGE 9398 2 330 20 muscovite conventional K-Ar M3174 "4.72E-04, 0.577E-04" 8.91 K=7.4% A COOLING AGE 9401 1 345 20 biotite conventional K-Ar B3177 "4.72E-04, 0.577E-04" 7.71 age not evaluated K=6.4% 9430 1 379 15 biotite 39Ar-40Ar total fusion W-4 "4.72E-04, 0.585E-04, 1.19E-04" 85 SEE PUBLISHED ARTICLE FOR 40AR/39AR ANALYTICAL DATA "A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. A K-AR AGE OF 430 M.Y. WAS REPORTED FOR THIS SAMPLE BY SMITH AND OTHERS, 1969. AGE WAS RECALCULATED TO 711 M.Y. BY M. WAMPLER." 9431 1 620 15 biotite 39Ar-40Ar total fusion FM-28 "4.72E-04, 0.585E-04, 1.19E-04" 94 SEE PUBLISHED ARTICLE FOR 40AR/39AR ANALYTICAL DATA A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD 9432 1 533 15 biotite 39Ar-40Ar total fusion FM-81 "4.72E-04, 0.585E-04, 1.19E-04" 97 SEE PUBLISHED ARTICLE FOR 40AR/39AR ANALYTICAL DATA A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. 9432 2 545.44 12 biotite conventional K-Ar FM-81 "4.72E-04, 0.585E-04, 1.19E-04*" 8.958 82.136 79 K=7.436 A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. 9433 1 702 15 biotite 39Ar-40Ar total fusion FM-92 "4.72E-04, 0.585E-04, 1.19E-04" 96 SEE PUBLISHED ARTICLE FOR 40AR/39AR ANALYTICAL DATA A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. 9433 2 717.18 16 biotite conventional K-Ar FM-92 "4.72E-04, 0.585E-04, 1.19E-04*" 8.937 113.31 93 K=7.419% A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. 9434 1 735 15 biotite 39Ar-40Ar total fusion SC-6 "4.72E-04, 0.585E-04, 1.19E-04" 98 SEE PUBLISHED ARTICLE FOR 40AR/39AR ANALYTICAL DATA A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. 9434 2 753.66 16 biotite conventional K-Ar SC-6 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 123.1 84 K=7.587% A COOLING AGE; GNEISS IS PROBABLY 1 B.Y. OLD. 9442 1 534.45 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 5.36 48.002 90 minimum age of metamorphic crystallization K=4.45% 9442 2 401.68 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.016 6.581 62 K=0.843% THIS AGE APPEARS TOO LOW; HORNFELS IS PROBABLY 530 M.Y. OLD 9443 1 467.8 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.498 3.829 68 minimum age of intrusion "CHLORITE (2-3%), PLAGIOCLASE (1-2%), SPHENE, EPIDOTE PRESENT" K=0.413% PLUTON MAY BE 530 M.Y. OLD. MILTON AND GRASTY (1969) AND MUEHLBERGER AND OTHERS (1966) REPORTED A K-AR WHOLE-ROCK AGE OF 480 M.Y. FOR THIS CORE. 9443 2 349.36 plagioclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.235 6.854 75 "TRACES OF QUARTZ, MICA, AND NATROLITE PRESENT" K=1.025% THIS AGE IS TOO LOW; PLUTON MAY BE 530 M.Y. OLD 9445 1 479.45 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.654 5.171 77 CHLORITE (5%) PLUS OTHER MINERALS PRESENT K=0.543% THIS AGE APPEARS LOW; 530 M.Y. IS A MINIMUM AGE FOR THE METAMORPHISM. 9445 2 512.92 10 hornblende (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.654 5.586 56 CHLORITE (5%) PLUS OTHER MINERALS PRESENT K=0.543% THIS AGE APPEARS LOW; 530 M.Y. IS A MINIMUM AGE FOR THE METAMORPHISM. 9446 1 407.01 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.247 8.197 59 CHLORITIZED BIOTITE (70-200 MESH) K=1.035% THIS AGE IS TOO LOW; 530 M.Y. IS A MINIMUM AGE FOR THE METAMORPHISM 9446 2 151.43 plagioclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.309 2.977 65 PLAGIOCLASE AN35-40 (70-200 MESH) K=1.087% SPURIOUS AGE 9449 1 176.83 4 whole rock conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04*" 5.32 14.23 83 minimum age of volcanism BASS (1969) REPORTED AN AGE OF 530 M.Y. FOR THIS CORE. 9450 1 187.18 10 whole rock conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04*" 0.308 0.8746 81 minimum age of volcanism 9451 1 491.24 24 whole rock conventional K-Ar 15 "4.76E-04, 0.589E-04, 1.18E-04*" 0.93 7.56 92 minimum age of intrusion BASS (1969) REPORTED AN AGE OF 524 M.Y. FOR THIS CORE. 9452 1 145.8 7 whole rock conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04*" 3.49 7.63 92 minimum age of volcanism 9452 2 150.75 3 whole rock conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04*" 3.49 7.9 89 minimum age of volcanism 9453 1 89.3 2.2 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04" 2.805 16.02 61 minimum age of volcanism (*) 9454 1 227 6 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 2.29 7.99 86 minimum age of intrusion 9454 2 228 3 whole rock conventional K-Ar "4.72E-04, 0.584E-04, 1.19E-04*" 2.29 8.03 90 minimum age of intrusion 9455 1 315.74 5 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04*" 1.24 6.16 90 minimum age of intrusion BASS (1969) REPORTED AN AGE OF 530 M.Y. FOR THIS CORE. 9456 1 195.74 15 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 0.813 2.42 38 THIS IS A MINIMUM AGE 9457 1 187.57 5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 0.558 1.588 52 minimum age of intrusion 9458 1 309.47 15 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04*" 0.43 2.09 32 minimum age of intrusion 70-120 MESH 9566 1 326.32 12 biotite conventional K-Ar JAC-1 "4.72E-04, 0.584E-04, 1.19E-04*" 9.22 47.48 97 K=7.65% A COOLING AGE 9566 2 298.55 12 muscovite conventional K-Ar JAC-1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.4 34.59 96 K20=6.14% A COOLING AGE 9567 1 312.7 12 muscovite conventional K-Ar JAC-2 "4.72E-04, 0.584E-04, 1.19E-04*" 7.59 37.31 96 K=6.30% A COOLING AGE 9568 1 318.27 11 biotite conventional K-Ar JAC-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.18 35.98 97 K=5.96% A COOLING AGE 9568 2 301.82 11 muscovite conventional K-Ar JAC-3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.7 41.15 98 K=7.22% A COOLING AGE 9569 1 335.77 10 muscovite conventional K-Ar JAC-5 "4.72E-04, 0.584E-04, 1.19E-04*" 6.61 35.12 98 K=5.49% A COOLING AGE 9570 1 339.93 13 biotite conventional K-Ar JAC-6 "4.72E-04, 0.584E-04, 1.19E-04*" 5.37 28.92 92 K=4.46% A COOLING AGE 9571 1 375.92 12 biotite conventional K-Ar JAC-7 "4.72E-04, 0.584E-04, 1.19E-04*" 6.95 41.82 96 K=5.77% A COOLING AGE 9571 2 330.78 11 muscovite conventional K-Ar JAC-7 "4.72E-04, 0.584E-04, 1.19E-04*" 7.63 39.88 96 K=6.33% A COOLING AGE 9572 1 303.49 9 biotite conventional K-Ar JAC-8 "4.72E-04, 0.584E-04, 1.19E-04*" 6.83 32.5 94 K=5.67% A COOLING AGE 9572 2 311.75 10 muscovite conventional K-Ar JAC-8 "4.72E-04, 0.584E-04, 1.19E-04*" 8.95 43.85 96 K=7.43% A COOLING AGE 9573 1 351.67 10 muscovite conventional K-Ar JAC-9 "4.72E-04, 0.584E-04, 1.19E-04*" 10.2 57.02 96 K=8.47% A COOLING AGE 9574 1 345.1 12 biotite conventional K-Ar HRD-1 "4.72E-04, 0.584E-04, 1.19E-04*" 6.71 36.74 97 K=5.57% A COOLING AGE 9575 1 319.74 13 biotite conventional K-Ar HRD-2 "4.72E-04, 0.584E-04, 1.19E-04*" 6.31 31.78 94 K=5.24% A COOLING AGE 9576 1 336.75 10 biotite conventional K-Ar HRD-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 40.03 94 K=6.23% A COOLING AGE 9577 1 301.07 9 biotite conventional K-Ar HRD-4 "4.72E-04, 0.584E-04, 1.19E-04*" 8.84 41.7 94 K=7.34% A COOLING AGE 9578 1 307.23 11 biotite conventional K-Ar HRD-5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 37.42 96 K=6.44% A COOLING AGE 9578 2 299.69 13 muscovite conventional K-Ar HRD-5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.41 34.78 93 K=6.15% A COOLING AGE 9579 1 334.34 10 biotite conventional K-Ar HRD-6 "4.72E-04, 0.584E-04, 1.19E-04*" 6.9 36.49 96 K=5.73% A COOLING AGE 9579 2 303.12 11 muscovite conventional K-Ar HRD-6 "4.72E-04, 0.584E-04, 1.19E-04*" 10.61 50.42 96 K=8.81% A COOLING AGE 9580 1 301.24 11 biotite conventional K-Ar HRD-7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.11 38.28 96 K=6.73% A COOLING AGE 9580 2 310.44 9 muscovite conventional K-Ar HRD-7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 40.43 96 K=6.88% A COOLING AGE 9581 1 304.36 9 muscovite conventional K-Ar HRD-8 "4.72E-04, 0.584E-04, 1.19E-04*" 10.05 47.97 97 K=8.34% A COOLING AGE 9582 1 304.15 9 biotite conventional K-Ar HRD-9 "4.72E-04, 0.584E-04, 1.19E-04*" 6.38 30.43 92 K=5.30% A COOLING AGE 9582 2 301.46 8 muscovite conventional K-Ar HRD-9 "4.72E-04, 0.584E-04, 1.19E-04*" 7.24 34.2 96 K=6.01% A COOLING AGE 9583 1 290.45 8 biotite conventional K-Ar HRD-10 "4.72E-04, 0.584E-04, 1.19E-04*" 5.14 23.32 90 K=4.27% A COOLING AGE 9584 1 286.31 10 biotite conventional K-Ar HRD-11 "4.72E-04, 0.584E-04, 1.19E-04*" 6.98 31.18 94 K=5.79% A COOLING AGE 9584 2 308.88 9 muscovite conventional K-Ar HRD-11 "4.72E-04, 0.584E-04, 1.19E-04*" 6.95 33.71 97 K=5.77% A COOLING AGE 9585 1 314.71 11 biotite conventional K-Ar HRD-12 "4.72E-04, 0.584E-04, 1.19E-04*" 6.41 31.73 96 K=5.32% A COOLING AGE 9585 2 327.38 10 muscovite conventional K-Ar HRD-12 "4.72E-04, 0.584E-04, 1.19E-04*" 3.69 19.07 94 PROBABLY AN IMPURE CONCENTRATE K=3.06% A COOLING AGE 9586 1 316.94 14 biotite conventional K-Ar HRD-13 "4.72E-04, 0.584E-04, 1.19E-04*" 6.81 33.97 96 K=5.65% A COOLING AGE 9586 2 316.24 15 muscovite conventional K-Ar HRD-13 "4.72E-04, 0.584E-04, 1.19E-04*" 4.22 21 93 PROBABLY AN IMPURE CONCENTRATE K=3.50% A COOLING AGE 9587 1 309.39 10 muscovite conventional K-Ar HRD-14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.16 39.65 98 K=6.77% A COOLING AGE 9588 1 302.03 10 biotite conventional K-Ar HRD-15 "4.72E-04, 0.584E-04, 1.19E-04*" 6.79 32.14 95 K=5.64% A COOLING AGE 9588 2 304.24 13 muscovite conventional K-Ar HRD-15 "4.72E-04, 0.584E-04, 1.19E-04*" 5.55 26.48 96 PROBABLY AN IMPURE CONCENTRATE K=4.61% A COOLING AGE 9589 1 291.73 10 biotite conventional K-Ar ATL-5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.34 38.02 90 K=6.92% A COOLING AGE 9589 2 327.2 11 muscovite conventional K-Ar ATL-5 "4.72E-04, 0.584E-04, 1.19E-04*" 9.4 48.55 93 K=7.80% A COOLING AGE 9590 1 282.6 20 whole rock conventional K-Ar ATL-6 "4.72E-04, 0.584E-04, 1.19E-04*" 4.77 21.01 88 K=3.96% A COOLING AGE 9591 1 295.9 14 muscovite conventional K-Ar ATL-7 "4.72E-04, 0.584E-04, 1.19E-04*" 4.64 21.48 91 PROBABLY AN IMPURE CONCENTRATE K=3.85% A COOLING AGE 9592 1 409.01 18 biotite conventional K-Ar ATL-8 "4.72E-04, 0.584E-04, 1.19E-04*" 4.02 26.57 92 age not evaluated K=3.34% MAY BE A COOLING AGE 9592 2 265.64 11 muscovite conventional K-Ar ATL-8 "4.72E-04, 0.584E-04, 1.19E-04*" 4.82 19.86 94 K=4.00% A COOLING AGE 9593 1 279.94 10 biotite conventional K-Ar ATL-9 "4.72E-04, 0.584E-04, 1.19E-04*" 4.92 21.45 92 minimum age of intrusion K=4.08% 9594 1 298.49 6 biotite conventional K-Ar ATL-10 "4.72E-04, 0.584E-04, 1.19E-04*" 7.44 34.77 97 age of intrusion K=6.18% 9595 1 285.33 9 biotite conventional K-Ar ATL-11 "4.72E-04, 0.584E-04, 1.19E-04*" 5.06 22.52 95 age not evaluated K=4.20% 9596 1 309.24 11 biotite conventional K-Ar ATL-12 "4.72E-04, 0.584E-04, 1.19E-04*" 6.41 31.13 96 age not evaluated K=5.32% 9596 2 304.54 9 muscovite conventional K-Ar ATL-12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.67 41.41 92 age not evaluated K=7.20% 9597 1 309.22 9 biotite conventional K-Ar ATL-13 "4.72E-04, 0.584E-04, 1.19E-04*" 8.13 39.48 98 K=6.75% A COOLING AGE 9597 2 316.24 6 muscovite conventional K-Ar ATL-13 "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 44.19 98 K=7.37% A COOLING AGE 9598 1 291.56 6 biotite conventional K-Ar ATL-14 "4.72E-04, 0.584E-04, 1.19E-04*" 7.52 34.26 97 K=6.24% A COOLING AGE 9598 2 317.15 12 muscovite conventional K-Ar ATL-14 "4.72E-04, 0.584E-04, 1.19E-04*" 8.61 42.98 95 K=7.15% A COOLING AGE 9599 1 309.03 13 biotite conventional K-Ar ATL-15 "4.72E-04, 0.584E-04, 1.19E-04*" 6.66 32.32 95 K=5.53% A COOLING AGE 9599 2 300.81 13 muscovite conventional K-Ar ATL-15 "4.72E-04, 0.584E-04, 1.19E-04*" 4.7 22.15 68 K=3.90% A COOLING AGE 9600 1 314.18 12 biotite conventional K-Ar ATL-16 "4.72E-04, 0.584E-04, 1.19E-04*" 8.14 40.22 98 K=6.76% A COOLING AGE 9600 2 330.76 10 muscovite conventional K-Ar ATL-16 "4.72E-04, 0.584E-04, 1.19E-04*" 7.51 39.25 94 K=6.23% A COOLING AGE 9601 1 295.22 10 biotite conventional K-Ar FBR-1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.77 35.88 97 K=6.45% A COOLING AGE 9601 2 325.71 26 muscovite conventional K-Ar FBR-1 "4.72E-04, 0.584E-04, 1.19E-04*" 5.89 30.27 94 K=4.89% A COOLING AGE 9602 1 307.84 12 biotite conventional K-Ar FBR-2 "4.72E-04, 0.584E-04, 1.19E-04*" 9.26 44.75 97 K=7.69% A COOLING AGE 9602 2 287.21 10 muscovite conventional K-Ar FBR-2 "4.72E-04, 0.584E-04, 1.19E-04*" 6.47 29 97 K=5.37% A COOLING AGE 9603 1 418.55 14 hornblende conventional K-Ar FBR-3 "4.72E-04, 0.584E-04, 1.19E-04*" 0.45 3.052 75 minimum age of metamorphic crystallization K=0.37% 9604 1 264.51 9 biotite conventional K-Ar FBR-4 "4.72E-04, 0.584E-04, 1.19E-04*" 5.91 24.24 88 K=4.91% A COOLING AGE 9604 2 285.43 12 muscovite conventional K-Ar FBR-4 "4.72E-04, 0.584E-04, 1.19E-04*" 7.76 34.55 96 K=6.44% A COOLING AGE 9605 1 325.87 13 biotite conventional K-Ar FBR-5 "4.72E-04, 0.584E-04, 1.19E-04*" 5.28 27.15 96 K=4.38% A COOLING AGE 9605 2 285.59 15 muscovite conventional K-Ar FBR-5 "4.72E-04, 0.584E-04, 1.19E-04*" 6.11 27.22 94 K=5.07% A COOLING AGE 9606 1 281.28 10 biotite conventional K-Ar FBR-6 "4.72E-04, 0.584E-04, 1.19E-04*" 7.01 30.72 91 K=5.82% A COOLING AGE 9606 2 298.21 10 muscovite conventional K-Ar FBR-6 "4.72E-04, 0.584E-04, 1.19E-04*" 5.16 24.09 93 K=4.28% A COOLING AGE 9607 1 297.59 10 biotite conventional K-Ar FBR-7 "4.72E-04, 0.584E-04, 1.19E-04*" 8.42 39.22 96 K=6.99% A COOLING AGE 9607 2 295.51 15 muscovite conventional K-Ar FBR-7 "4.72E-04, 0.584E-04, 1.19E-04*" 5.7 26.35 92 K=4.73% A COOLING AGE 9608 1 304.62 12 biotite conventional K-Ar FBR-8 "4.72E-04, 0.584E-04, 1.19E-04*" 7.06 33.73 92 K=5.86% A COOLING AGE 9609 1 297.68 14 biotite conventional K-Ar FBR-9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.96 41.75 95 K=7.44% A COOLING AGE 9609 2 301.41 12 muscovite conventional K-Ar FBR-9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.34 39.39 96 K=6.92% A COOLING AGE 9610 1 294.87 12 biotite conventional K-Ar FBR-10 "4.72E-04, 0.584E-04, 1.19E-04*" 7.42 34.22 94 K=6.16% A COOLING AGE 9611 1 309.82 11 biotite conventional K-Ar OCN-1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.08 39.32 98 K=6.71% A COOLING AGE 9612 1 286.37 9 biotite conventional K-Ar OCN-2 "4.72E-04, 0.584E-04, 1.19E-04*" 5.96 26.63 92 K=4.95% A COOLING AGE 9612 2 309.69 10 muscovite conventional K-Ar OCN-2 "4.72E-04, 0.584E-04, 1.19E-04*" 10.31 50.15 96 K=8.56% A COOLING AGE 9613 1 302.13 10 biotite conventional K-Ar OCN-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.78 36.84 96 K=6.46% A COOLING AGE 9613 2 323.41 11 muscovite conventional K-Ar OCN-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.73 39.42 97 K=6.42% A COOLING AGE 9614 1 284.6 9 biotite conventional K-Ar OCN-4 "4.72E-04, 0.584E-04, 1.19E-04*" 7.78 34.53 96 K=6.46% A COOLING AGE 9614 2 298.1 10 muscovite conventional K-Ar OCN-4 "4.72E-04, 0.584E-04, 1.19E-04*" 9.57 44.66 98 K=7.94% A COOLING AGE 9615 1 307.23 9 muscovite conventional K-Ar OCN-5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.66 41.76 96 K=7.19% A COOLING AGE 9616 1 272.32 8 whole rock conventional K-Ar OCN-6 "4.72E-04, 0.584E-04, 1.19E-04*" 3.19 13.5 90 K=2.65% A COOLING AGE 9617 1 336.85 13 biotite conventional K-Ar OCN-7 "4.72E-04, 0.584E-04, 1.19E-04*" 4.58 24.42 96 K=3.80% A COOLING AGE 9617 2 311.2 12 muscovite conventional K-Ar OCN-7 "4.72E-04, 0.584E-04, 1.19E-04*" 6.73 32.91 96 K=5.59% A COOLING AGE 9618 1 312.82 10 muscovite conventional K-Ar OCN-8 "4.72E-04, 0.584E-04, 1.19E-04*" 4.25 20.9 94 K=3.53% A COOLING AGE 9619 1 298.79 10 muscovite conventional K-Ar OCN-9 "4.72E-04, 0.584E-04, 1.19E-04*" 7.93 37.1 97 K=6.58% A COOLING AGE 9620 1 308.07 9 biotite conventional K-Ar OCN-10 "4.72E-04, 0.584E-04, 1.19E-04*" 9.42 45.56 97 K=7.82% A COOLING AGE 9622 1 44.8 1.5 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 5.689 85 "K20=8.71, 8.69%" "AGE APPEARS TOO OLD, EXCESS ARGON MAY BE PRESENT." 9622 2 43.1 1.5 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.97 5.634 74 "K20=9.01, 8.93%" "AGE APPEARS TOO OLD, EXCESS ARGON MAY BE PRESENT" 9622 3 44 1.5 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.185 5.252 72 BIOTITE MIXED WITH MINOR HORNBLENDE "K20=8.17, 8.20%" "AGE APPEARS TOO OLD, EXCESS ARGON MAY BE PRESENT." 9623 1 50.6 1.7 biotite conventional K-Ar 2 (222) "4.962E-04, 0.581E-04, 1.1167E-04" 8.42 6.214 87 "K20=8.42, 8.42%" "AGE APPEARS TO BE TOO OLD, EXCESS ARGON MAY BE PRESENT." 9623 2 45.5 1.5 biotite conventional K-Ar 2 (222) "4.962E-04, 0.581E-04, 1.1167E-04" 8.675 5.754 87 "K20=8.70, 8.65%" "AGE APPEARS TO BE TOO OLD, EXCESS ARGON MAY BE PRESENT" 9623 3 49.1 1.6 biotite conventional K-Ar 2 (222) "4.962E-04, 0.581E-04, 1.1167E-04" 6.085 4.361 87 BIOTITE MIXED WITH HORNBLENDE "K20=6.07, 6.10%" "AGE APPEARS TO BE TOO OLD, EXCESS ARGON MAY BE PRESENT" 9625 1 44 1.5 biotite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.59 5.511 89 "K20=8.57, 8.61%" "AGE APPEARS TO BE TOO OLD, EXCESS ARGON MAY BE PRESENT" 9627 1 40.7 1.4 biotite conventional K-Ar 5. (503) "4.962E-04, 0.581E-04, 1.1167E-04" 2.57 1.524 50 age of intrusion BIOTITE MIXED WITH MINOR CHLORITE AND HORNBLENDE "K20=2.57, 2.57%" 9628 1 43.2 1.5 biotite conventional K-Ar 5. (503A) "4.962E-04, 0.581E-04, 1.1167E-04" 7.775 4.896 78 maximum age of intrusion "K20=7.79, 7.76%" 9631 1 37.8 1.3 biotite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 7.65 4.211 77 minimum age of volcanism "K20=7.66, 7.64%" 9633 1 56.3 1.9 biotite conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 3.935 3.238 45 age of volcanism "SAMPLE NUMBER IS 10, NOT 9 AS PUBLISHED--COMPILER" "K20=3.90, 3.95, 3.99, 3.90%" 9634 1 59.7 2 biotite conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 8.09 7.075 80 age of volcanism "SAMPLE NUMBER IS 11, NOT 10 AS PUBLISHED--COMPILER" "K20=8.11, 8.07%" 9635 1 65.5 2.2 biotite conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 7.952 92 age of volcanism "SAMPLE NUMBER IS 12, NOT 11 AS PUBLISHED--COMPILER" "K20=8.26, 8.30%" 9637 1 8.3 2.4 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.58 0.069 10 age of volcanism 9638 1 9.9 1 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.085 22 age of volcanism 9639 1 13.5 2.8 whole rock conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.71 0.143 13 age of volcanism 9640 1 15.9 0.9 whole rock conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.11 0.256 59 age of volcanism 9641 1 17.3 0.8 whole rock conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 5.19 1.3 74 age of volcanism 9642 1 20.7 3.5 whole rock conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.18 0.054 17 age of volcanism 9643 1 7.8 0.7 whole rock conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.17 0.132 20 age of volcanism 9644 1 7.9 0.5 whole rock conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.103 54 age of volcanism 9645 1 7.6 0.4 whole rock conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 1.8 0.197 67 age of volcanism 9646 1 7.8 0.5 whole rock conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 0.12 46 age of volcanism 9647 1 2.8 0.7 whole rock conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 2.05 0.084 10 age of volcanism 9648 1 2.8 0.5 whole rock conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 2.2 0.089 14 age of volcanism 9649 1 3.1 1 whole rock conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 0.058 8 age of volcanism 9650 1 0.62 0.03 sanidine conventional K-Ar 1. (66A069) "4.962E-04, 0.581E-04, 1.1167E-04" 11.02 0.098 64 age of volcanism "K20=11.02, 11.02%" 9651 1 0.61 0.03 sanidine conventional K-Ar 2. (62SJ-1) "4.962E-04, 0.581E-04, 1.1167E-04" 10.445 0.0921 87 age of volcanism "K20=10.39, 10.50%" 9652 1 0.68 0.02 sanidine conventional K-Ar 3. (2C530) "4.962E-04, 0.581E-04, 1.1167E-04" 10.715 0.1079 5662 age of volcanism "K20=10.71, 10.72%; 40AR-RADIOGENIC=0.1008 AND 0.1078XE-10 MOL/GM" 9653 1 1.1 0.05 sanidine conventional K-Ar 4. (427F) "4.962E-04, 0.581E-04, 1.1167E-04" 10.6 0.1678 8 maximum age of volcanism SANIDINE CONTAMINATED WITH OLDER MATERIAL "K20=10.57, 10.63%" 9654 1 0.76 0.03 sanidine conventional K-Ar 5. (64G001) "4.962E-04, 0.581E-04, 1.1167E-04" 10.595 0.1166 6246 age of volcanism "K20=10.63, 10.56%; 40AR-RAD.=0.1152 AND 0.1180XE-10 MOL/GM" "DATA AND DESCRIPTIONS FROM DALRYMPLE, COX, AND DOELL, 1965" 9655 1 0.73 0.03 sanidine conventional K-Ar 6. (64G002) "4.962E-04, 0.581E-04, 1.1167E-04" 10.705 0.1122 5679 age of volcanism "K20=10.69, 10.72%; 40AR-RAD=0.1154 AND 0.1090XE-10 MOL/GM" "DATA AND DESCRIPTION FROM DALRYMPLE, COX, AND DOELL, 1965." 9656 1 0.69 0.03 sanidine conventional K-Ar 7. (64G003) "4.962E-04, 0.581E-04, 1.1167E-04" 10.955 0.1098 4261 age of volcanism "K20=10.94, 10.97%; 40AR-RAD=0.1035 AND 0.1160XE-10 MOL/GM." "DATA AND DESCRIPTION FROM DALRYMPLE, COX, AND DOELL, 1965." 9657 1 1.2 0.07 whole rock conventional K-Ar 1. (78C11) "4.962E-04, 0.581E-04, 1.1167E-04" 1.13 0.0196 17 age of volcanism "K20=1.13, 1.13, 1.13, 1.13%" 9658 1 1.22 0.07 whole rock conventional K-Ar 2. (78C9) "4.962E-04, 0.581E-04, 1.1167E-04" 0.865 0.0146 16 age of volcanism "K20=0.863, 0.864, 0.865, 0.868%" 9659 1 0.13 0.1 whole rock conventional K-Ar 3. (78C14) "4.962E-04, 0.581E-04, 1.1167E-04" 0.677 0.0013 1 minimum age of volcanism "K20=0.674, 0.676, 0.679, 0.679%" 9660 1 1.62 0.15 whole rock conventional K-Ar 4. (78C15) "4.962E-04, 0.581E-04, 1.1167E-04" 0.224 0.0052 10 age of volcanism "K20=0.222, 0.224, 0.224, 0.227%" 9661 1 2.15 0.13 whole rock conventional K-Ar 5. (78C8) "4.962E-04, 0.581E-04, 1.1167E-04" 0.251 0.0078 16 age of volcanism "K20=0.248, 0.250, 0.252, 0.255%" 9662 1 71.94 2.3 K feldspar conventional K-Ar 1. (MB-1-62) "4.76E-04, 0.589E-04, 1.18E-04*" 6.71 7.09 71 age of volcanism K=5.57% 9663 1 66.43 2.8 K feldspar conventional K-Ar 2. (MB-3-62) "4.76E-04, 0.589E-04, 1.18E-04*" 12.43 12.11 60 age of volcanism K=10.32% 9664 1 61.85 1.8 biotite conventional K-Ar 3. (PED-19-62) "4.76E-04, 0.589E-04, 1.18E-04*" 8.82 7.99 90 age of volcanism K=7.32% 9665 1 58.14 1.7 biotite conventional K-Ar 4. (PED-15-62) "4.76E-04, 0.589E-04, 1.18E-04*" 8.24 7.01 85 age of volcanism K=6.84% 9666 1 28.65 2.6 plagioclase conventional K-Ar 5. (PED-16-63) "4.76E-04, 0.589E-04, 1.18E-04*" 0.837 0.348 35 age of volcanism K=0.695% 9667 1 27.57 1.2 whole rock conventional K-Ar 6. (PED-17-63) "4.76E-04, 0.589E-04, 1.18E-04*" 1.89 0.756 56 age of volcanism K=1.565% 9668 1 19.85 5.8 whole rock conventional K-Ar 7. (PED-15-63) "4.76E-04, 0.589E-04, 1.18E-04*" 2.45 0.704 49 minimum age of volcanism SAMPLE LEACHED WITH DILUTE ACETIC OR NITRIC TO DISSOLVE CARBONATES "K=2.035%; AVERAGE OF 2 DETERMINATIONS IS 26.0 MA, SEE FOLLOWING K-AR AGE." 9668 2 32.13 5.8 whole rock conventional K-Ar 7. (PED-15-63) "4.76E-04, 0.589E-04, 1.18E-04*" 2.4 1.12 65 minimum age of volcanism SAMPLE WAS NOT LEACHED WITH ACID "K=1.99%; AVERAGE OF 2 DETERMINATIONS IS 26.0 MA, SEE PRECEDING K-AR AGE." 9669 1 30.49 0.9 sanidine conventional K-Ar 8. (PED-17-62) "4.76E-04, 0.589E-04, 1.18E-04*" 6.46 2.86 92 maximum age of volcanism K=5.36% 9669 2 26.4 0.9 sanidine conventional K-Ar 8. (PED-76-63) "4.76E-04, 0.589E-04, 1.18E-04*" 6.4 2.45 74 age of volcanism K=5.315% 9670 1 13.41 0.8 K feldspar conventional K-Ar 9. (PED-1-62) "4.76E-04, 0.589E-04, 1.18E-04*" 7.12 1.38 46 K-FELDSPAR PLUS GLASS K=5.91% SPURIOUS AGE; TOO YOUNG 9670 2 27.35 0.9 K feldspar conventional K-Ar PED-1-62B "4.76E-04, 0.589E-04, 1.18E-04*" 6.1 2.42 77 age of volcanism K=5.06% 9671 1 20.27 3 whole rock conventional K-Ar 10. (PED-8-63) "4.76E-04, 0.589E-04, 1.18E-04*" 3.22 0.945 25 minimum age of volcanism K=2.67% 9672 1 74.57 2.2 biotite conventional K-Ar 11. (PED-11-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.02 8.79 88 age of intrusion K=6.66% 9673 1 76.76 2.2 biotite conventional K-Ar 12. PED-12-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.53 9.63 95 maximum age of intrusion K=7.08% 9674 1 69.66 3.3 biotite conventional K-Ar 13. (PED-3-64) "4.76E-04, 0.589E-04, 1.18E-04*" 6.22 6.36 65 age of intrusion K=5.165%; AGE IS AVERAGE OF 2 DETERMINATIONS 9674 2 76.42 3.3 biotite conventional K-Ar 13. (PED-3-64) "4.76E-04, 0.589E-04, 1.18E-04*" 6.22 6.99 72 age of intrusion K=5.165%; AGE IS AN AVERAGE OF 2 DETERMINATIONS 9675 1 39.39 1.3 biotite conventional K-Ar 14. (PED-9-63) "4.76E-04, 0.589E-04, 1.18E-04*" 7.78 4.46 71 age of volcanism K=6.46% 9676 1 25.16 1.4 biotite conventional K-Ar 15. (PED-10-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.39 3.06 48 age of volcanism K=6.965% 9677 1 26.57 1.2 biotite conventional K-Ar 16. (5A-2) "4.76E-04, 0.589E-04, 1.18E-04*" 8.07 3.11 56 age of volcanism K=6.70% 9678 1 28.48 1.9 biotite conventional K-Ar 17. (MB-2-62) "4.76E-04, 0.589E-04, 1.18E-04*" 7.84 3.24 42 age of volcanism K=6.505% 9679 1 25.1 0.9 biotite conventional K-Ar 18. (PED-1-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.52 3.1 67 age of intrusion K=7.075% 9680 1 73.86 2.2 muscovite conventional K-Ar 1. (HNMP) "4.72E-04, 0.584E-04, 1.19E-04*" 9.37 10.17 89 minimum age of intrusion 9681 1 71.62 2.3 biotite conventional K-Ar 2. (1045) "4.72E-04, 0.584E-04, 1.19E-04*" 7.71 8.11 87 age of intrusion 9681 2 68.99 2.2 biotite conventional K-Ar 2. (1045) "4.72E-04, 0.584E-04, 1.19E-04*" 8.04 8.14 87 age of intrusion 9682 1 42.69 1.2 biotite conventional K-Ar 3. (TL) "4.72E-04, 0.584E-04, 1.19E-04*" 8.86 5.51 90 minimum age of intrusion 9683 1 34.97 1.4 biotite conventional K-Ar 4. (386) "4.72E-04, 0.584E-04, 1.19E-04*" 8.36 4.25 79 age of intrusion 9684 1 34.74 1 biotite conventional K-Ar 5. (WR-2) "4.72E-04, 0.584E-04, 1.19E-04*" 7.98 4.03 89 age of intrusion 9685 1 34.73 1.1 biotite conventional K-Ar 6. (NY-5) "4.72E-04, 0.584E-04, 1.19E-04*" 7.29 3.68 83 age of intrusion 9686 1 31.91 1.1 biotite conventional K-Ar 7. (389) "4.72E-04, 0.584E-04, 1.19E-04*" 8.48 3.93 85 age of intrusion 9687 1 29.81 1 biotite conventional K-Ar 8. (472) "4.72E-04, 0.584E-04, 1.19E-04*" 7.14 3.09 77 age of intrusion 9688 1 29.75 1.1 biotite conventional K-Ar 9. (390) "4.72E-04, 0.584E-04, 1.19E-04*" 7.85 3.39 84 age of intrusion 9689 1 12.83 0.6 biotite conventional K-Ar 10. (348) "4.72E-04, 0.584E-04, 1.19E-04*" 8.74 1.62 61 age of intrusion 9690 1 12.64 0.6 biotite conventional K-Ar 11. (391) "4.72E-04, 0.584E-04, 1.19E-04*" 8.38 1.53 60 age of intrusion 9691 1 1291.08 40 biotite conventional K-Ar BC6119 "4.72E-04, 0.584E-04, 1.19E-04*" 9.28 252 98 minimum age of intrusion K=7.70% 9692 1 1226.9 40 biotite conventional K-Ar BC6145 "4.72E-04, 0.584E-04, 1.19E-04*" 8.38 212 98 K=6.96% AGE IS TOO YOUNG; AGE IS PROBABLY AROUND 1500 M.Y. 9695 1 110.47 2.4 whole rock conventional K-Ar 1. (MB-16-64) "4.76E-04, 0.589E-04, 1.18E-04*" 4.28 7.02 71 age of volcanism K=3.555% 9696 1 66.67 2 whole rock conventional K-Ar 2. (MB-2-65) "4.76E-04, 0.589E-04, 1.18E-04*" 4.06 3.97 97 age of volcanism K=3.37% 9697 1 75.7 1.5 biotite conventional K-Ar 3. (PED-12-61A) "4.76E-04, 0.589E-04, 1.18E-04*" 7.43 8.27 81 age of volcanism K=6.165% 9698 1 75.89 1.5 biotite conventional K-Ar 4. (MB-5-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.63 9.63 90 age of volcanism K=7.165% 9699 1 72.94 1.6 biotite conventional K-Ar 5. (MB-1-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.23 8.82 84 age of volcanism K=6.835% 9699 2 71.32 1.6 biotite conventional K-Ar 5. (MB-1-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.23 8.62 76 age of volcanism K=6.835% 9700 1 70.27 1.9 biotite conventional K-Ar 6. (MB-14-64) "4.76E-04, 0.589E-04, 1.18E-04*" 7.91 8.16 36 age of volcanism K=6.57% 9700 2 71.7 1.5 biotite conventional K-Ar 6. (MB-14-64) "4.76E-04, 0.589E-04, 1.18E-04*" 7.91 8.33 69 age of volcanism K=6.57% 9701 1 70.42 1.5 biotite conventional K-Ar 7. (MB-1-65) "4.76E-04, 0.589E-04, 1.18E-04*" 8.55 8.84 69 age of volcanism K=7.10% 9702 1 74.18 1.5 biotite conventional K-Ar 8. (MB-15-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.42 9.18 85 age of volcanism K=6.99% 9702 2 73.79 1.6 biotite conventional K-Ar 8. (MB-15-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.42 9.13 69 age of volcanism K=6.99% 9702 3 70.3 1.7 K feldspar conventional K-Ar 8. (MB-15-64) "4.76E-04, 0.589E-04, 1.18E-04*" 11.55 11.92 59 minimum age of volcanism K=9.585% 9702 4 68.16 3 plagioclase conventional K-Ar 8. (MB-15-64) "4.76E-04, 0.589E-04, 1.18E-04*" 0.13 0.13 57 K=0.11% AGE IS SLIGHTLY LOW 9703 1 70.19 1.4 biotite conventional K-Ar 9. (MB-10-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.85 9.12 81 age of intrusion K=7.345% 9704 1 34.1 0.3 plagioclase conventional K-Ar 10. (MB-9-64) "4.76E-04, 0.589E-04, 1.18E-04" 1.07 41 age of intrusion K=1.755% 9704 2 Unk "4.76E-04, 0.589E-04, 1.18E-04" 2.11 9705 1 24.04 1.4 whole rock conventional K-Ar 11. (MB-12-64) "4.76E-04, 0.589E-04, 1.18E-04*" 3.1 1.08 44 age of volcanism K=2.575% 9706 1 23.85 0.7 whole rock conventional K-Ar 12. (MB-6-64) "4.76E-04, 0.589E-04, 1.18E-04*" 3.5 1.21 60 age of volcanism K=2.905% 9707 1 14.74 2.41 whole rock conventional K-Ar 13. (MB-13-64) "4.76E-04, 0.589E-04, 1.18E-04*" 2.3 0.49 23 age of volcanism K=1.91% 9708 1 14.26 0.5 sanidine conventional K-Ar 14. (MB-3-64) "4.76E-04, 0.589E-04, 1.18E-04*" 6.26 1.29 87 age of volcanism K=5.20% 9708 2 12.94 0.6 sanidine conventional K-Ar 14. (MB-3-64) "4.76E-04, 0.589E-04, 1.18E-04*" 6.26 1.17 30 age of volcanism K=5.20% 9709 1 12.96 0.4 sanidine conventional K-Ar 15. (MB-2-64) "4.76E-04, 0.589E-04, 1.18E-04*" 6.14 1.15 69 age of volcanism K=5.10% 9710 1 10.9 1.3 whole rock conventional K-Ar 16. (MB-7-64) "4.76E-04, 0.589E-04, 1.18E-04*" 1.08 0.17 28 age of volcanism K=0.895% 9711 1 9.9 1.7 whole rock conventional K-Ar 17. (MB-17-64) "4.76E-04, 0.589E-04, 1.18E-04*" 1.26 0.18 22 age of intrusion K=1.05% 9724 1 1397 50 hornblende conventional K-Ar BC6632 "4.72E-04, 0.584E-04, 1.19E-04*" 0.761 231 99 K=0.632% AGE IS TOO YOUNG; AGE IS AROUND 1700-1800 M.Y. 9744 1 0.14 0.09 whole rock conventional K-Ar 28. (75G301) "4.962E-04, 0.581E-04, 1.1167E-04" 1.356 0.0027 12 age of volcanism 40AR-RAD=0.00222 AND 0.00312XE-10 MOL/GM 9745 1 2.06 0.34 whole rock conventional K-Ar 29. (75G304) "4.962E-04, 0.581E-04, 1.1167E-04" 1.738 0.0557 46 age of volcanism 40AR-RAD=0.0629 AND 0.0484XE-10 MOL/GM 9746 1 0.4 0.04 whole rock conventional K-Ar 30. (75G305) "4.962E-04, 0.581E-04, 1.1167E-04" 1.789 0.0103 9 age of volcanism 9747 1 0.49 0.11 whole rock conventional K-Ar 31. (75G306) "4.962E-04, 0.581E-04, 1.1167E-04" 1.61 0.0113 5 age of volcanism 9748 1 1.07 0.12 whole rock conventional K-Ar 32. (75G308) "4.962E-04, 0.581E-04, 1.1167E-04" 1.312 0.0188 410 age of volcanism 40AR-RAD=0.01638 AND 0.02118XE-10 MOL/GM 9749 1 1.08 0.06 whole rock conventional K-Ar 33. (75G309) "4.962E-04, 0.581E-04, 1.1167E-04" 1.53 0.0236 1121 age of volcanism 40AR-RAD=0.02317 AND 0.02395XE-10 MOL/GM 9750 1 0.19 0.04 whole rock conventional K-Ar 34. (75G310) "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 0.0022 2 age of volcanism 40AR-RAD=0.00222 AND 0.00220 X E-10 MOL/GM 9751 1 1.07 0.14 whole rock conventional K-Ar 35. (75G313) "4.962E-04, 0.581E-04, 1.1167E-04" 1.124 0.0173 33 age of volcanism 40AR-RAD=0.01770 AND 0.01695XE-10 MOL/GM 9752 1 0.23 0.02 whole rock conventional K-Ar 36. (75G314) "4.962E-04, 0.581E-04, 1.1167E-04" 1.525 0.0052 88 age of volcanism 40AR-RAD=0.00529 AND 0.00505XE-10 MOL/GM 9753 1 3.42 0.1 biotite conventional K-Ar 37. (75G315) "4.962E-04, 0.581E-04, 1.1167E-04" 8.24 0.4058 43 age of volcanism 9753 2 2.2 0.7 plagioclase conventional K-Ar 37. (75G315) "4.962E-04, 0.581E-04, 1.1167E-04" 0.696 0.0221 3 AGE IS TOO YOUNG; AGE IS CONSIDERED TO BE 3.42 M.Y. 9754 1 3.53 0.17 whole rock conventional K-Ar 38. (75G318) "4.962E-04, 0.581E-04, 1.1167E-04" 1.32 0.0671 20 age of intrusion 9754 2 5.91 0.18 whole rock conventional K-Ar 38. (75G318) "4.962E-04, 0.581E-04, 1.1167E-04" 1.236 0.1005 27 AGE TOO OLD; AGE CONSIDERED TO BE 3.53 M.Y. 9754 3 4.23 0.13 whole rock conventional K-Ar 38. (75G318) "4.962E-04, 0.581E-04, 1.1167E-04" 1.236 0.0754 43 AGE TOO OLD; AGE CONSIDERED TO BE 3.53 M.Y. 9755 1 3.6 0.08 whole rock conventional K-Ar 39. (8-193-2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.786 0.0926 2847 age of volcanism 40AR-RAD=0.09312 AND 0.09218XE-10 MOL/GM 9756 1 3.54 0.08 whole rock conventional K-Ar 40. (8-195-2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.713 0.0875 2642 age of volcanism 40AR-RAD=0.08700 AND 0.08794XE-10 MOL/GM 9757 1 3.66 0.08 whole rock conventional K-Ar 41. (8-196-2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.318 0.0693 3734 age of volcanism 40AR-RAD=0.06941 AND 0.06925XE-10 MOL/GM 9758 1 3.67 0.16 whole rock conventional K-Ar 42. (8-199-6) "4.962E-04, 0.581E-04, 1.1167E-04" 0.857 0.0469 168 age of volcanism 40AR-RAD=0.04188 AND 0.05202XE-10 MOL/GM 9759 1 2.46 0.98 biotite conventional K-Ar 43. (9-8-11) "4.962E-04, 0.581E-04, 1.1167E-04" 6.475 0.2297 2 AGE IS CONSIDERED TO BE 2.99 M.Y. 9759 2 3.04 0.2 plagioclase conventional K-Ar 43. (9-8-11) "4.962E-04, 0.581E-04, 1.1167E-04" 0.458 0.02 16 AGE IS CONSIDERED TO BE 2.99 M.Y. 9760 1 3.75 0.32 biotite conventional K-Ar 44. (9-85-2) "4.962E-04, 0.581E-04, 1.1167E-04" 7.645 0.4134 6 AGE IS CONSIDERED TO BE 3.14 M.Y. 9760 2 3.09 0.09 sanidine conventional K-Ar 44. (9-85-2) "4.962E-04, 0.581E-04, 1.1167E-04" 12.315 0.5488 66 AGE IS CONSIDERED TO BE 3.14 M.Y. 9761 1 3.64 0.11 whole rock conventional K-Ar 45. (13-108-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.401 0.0735 6030 age of volcanism 40AR-RAD=0.07347 AND 0.07358XE-10 MOL/GM 9762 1 3.5 0.19 whole rock conventional K-Ar 46. (13-111-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.708 0.0357 21 age of volcanism 9763 1 4.31 0.27 whole rock conventional K-Ar 47. (13-111-5) "4.962E-04, 0.581E-04, 1.1167E-04" 0.543 0.0337 15 AGE IS PROBABLY AROUND 4 M.Y. 9763 2 4.15 0.21 whole rock conventional K-Ar 47. (13-111-5) "4.962E-04, 0.581E-04, 1.1167E-04" 0.582 0.0348 12 AGE IS PROBABLY AROUND 4 M.Y. 9763 3 3.37 0.07 whole rock conventional K-Ar 47. (13-111-5) "4.962E-04, 0.581E-04, 1.1167E-04" 0.582 0.0282 19 AGE IS PROBABLY AROUND 4 M.Y. 9764 1 3.31 0.42 biotite conventional K-Ar 48. (13-113-6) "4.962E-04, 0.581E-04, 1.1167E-04" 7 0.3345 4 AGE IS CONSIDERED TO BE 2.99 M.Y. 9764 2 2.95 0.13 plagioclase conventional K-Ar 48. (13-113-6) "4.962E-04, 0.581E-04, 1.1167E-04" 0.518 0.022 24 AGE IS CONSIDERED TO BE 2.99 M.Y. 9765 1 3.1 0.22 whole rock conventional K-Ar 49. (13-113-15) "4.962E-04, 0.581E-04, 1.1167E-04" 1.042 0.0463 78 age of volcanism 40AR-RAD=0.04686 AND 0.04569XE-10 MOL/GM 9766 1 2.98 0.12 whole rock conventional K-Ar 50. (13-113-17) "4.962E-04, 0.581E-04, 1.1167E-04" 0.726 0.0312 1616 age of volcanism 40AR-RAD=0.03076 AND 0.03169XE-10 MOL/GM 9767 1 5.5 0.08 biotite conventional K-Ar 51. (75G316) "4.962E-04, 0.581E-04, 1.1167E-04" 8.38 0.6645 3829 40AR-RAD=0.6578 AND 0.6712XE-10 MOL/GM AGE APPEARS TO BE TOO OLD; AGE IS CONSIDERED TO BE 2.52 M.Y. 9767 2 6.79 0.23 hornblende conventional K-Ar 51. (75G316) "4.962E-04, 0.581E-04, 1.1167E-04" 1.036 0.095 2317 40AR-RAD=0.1029 AND 0.08706XE-10 MOL/GM AGE APPEARS TO BE TOO OLD; AGE IS CONSIDERED TO BE 2.52 M.Y. 9768 1 2.51 0.05 biotite conventional K-Ar 52. (75G317) "4.962E-04, 0.581E-04, 1.1167E-04" 8.63 0.313 2834 age of volcanism 40AR-RAD=0.3090 AND 0.3169XE-10 MOL/GM 9769 1 0.59 0.02 sanidine conventional K-Ar 53. (9-6-10) "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 0.078 52 age of volcanism 9770 1 3.33 0.2 biotite conventional K-Ar 54. (13-110-1) "4.962E-04, 0.581E-04, 1.1167E-04" 8.24 0.4051 302829 age of volcanism "40AR-RAD=0.3764, 0.4460, AND 0.3930XE-10 MOL/GM" 9771 1 3.66 0.07 biotite conventional K-Ar 55. (I-101-11) "4.962E-04, 0.581E-04, 1.1167E-04" 8 0.4268 4140 40AR-RAD=0.4391 AND 0.4144XE-10 MOL/GM AGE IS CONSIDERED TO BE 3.50 M.Y. 9771 2 3.39 0.06 plagioclase conventional K-Ar 55. (I-101-11) "4.962E-04, 0.581E-04, 1.1167E-04" 0.74 0.0363 4222 40AR-RAD=0.03674 AND 0.03595XE-10 MOL/GM AGE IS CONSIDERED TO BE 3.50 M.Y. 9772 1 3.64 0.08 whole rock conventional K-Ar 56. (I-103-3) "4.962E-04, 0.581E-04, 1.1167E-04" 1.166 0.0637 235147 age of volcanism "40AR-RAD=0.07003, 0.06031, 0.06061XE-10 MOL/GM" 9773 1 8.33 0.98 whole rock conventional K-Ar 57. (I-100-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.608 0.0731 34 40AR-RAD=0.07317 AND 0.07298XE-10 MOL/GM SPURIOUS AGE 9774 1 1.04 0.02 sanidine conventional K-Ar 58. (8-197-4) "4.962E-04, 0.581E-04, 1.1167E-04" 10.97 0.1651 7149 age of volcanism 40AR-RAD=0.1648 AND 0.1653XE-10 MOL/GM 9775 1 3.46 0.07 whole rock conventional K-Ar 59. (8-126-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.894 0.0445 31 age of volcanism 9776 1 1.75 0.1 whole rock conventional K-Ar 60. (I-99-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.566 0.3993 68 age of volcanism 40AR-RAD=0.04160 AND 0.03827XE-10 MOL/GM 9777 1 2.54 0.05 biotite conventional K-Ar 61. (13-43-13) "4.962E-04, 0.581E-04, 1.1167E-04" 8.56 0.314 25 age of volcanism 9778 1 4.02 0.06 whole rock conventional K-Ar 62. (I-88-2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.962 0.1137 2627 age of volcanism 40AR-RAD=0.11468 AND 0.11263XE-10 MOL/GM 9779 1 3.56 0.1 whole rock conventional K-Ar 63. (8-191-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.883 0.0441 1246 age of volcanism 40AR-RAD=0.04087 AND 0.04736XE-10 MOL/GM 9780 1 89 2.6 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 9781 1 34.59 0.4 biotite conventional K-Ar 1. (HB6-120D) "4.962E-04, 0.581E-04, 1.1167E-04" 8.116 4.08 90 age of intrusion K=6.737% 9781 2 31.8 0.41 hornblende conventional K-Ar 1. (HB6-120D) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5637 0.2603 40 age of intrusion K=0.4679% 9782 1 32.19 0.37 biotite conventional K-Ar 2. (I8-1) "4.962E-04, 0.581E-04, 1.1167E-04" 8.068 3.772 89 age of intrusion K=6.697% 9782 2 35.85 0.49 hornblende conventional K-Ar 2. (I8-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5038 0.2625 44 age of intrusion K=0.4182% 9783 1 32.99 0.38 biotite conventional K-Ar 3. (BW8-1) "4.962E-04, 0.581E-04, 1.1167E-04" 9.017 4.321 78 age of intrusion K=7.485% 9784 1 31.51 0.48 biotite conventional K-Ar 4. (HB6-10) "4.962E-04, 0.581E-04, 1.1167E-04" 8.922 4.082 84 age of intrusion K=7.406% 9785 1 32.71 0.38 biotite conventional K-Ar 5. (HB5-192) "4.962E-04, 0.581E-04, 1.1167E-04" 7.886 3.747 88 age of intrusion K=6.546% 9786 1 33.43 0.39 biotite conventional K-Ar 6. (HB7-23B) "4.962E-04, 0.581E-04, 1.1167E-04" 9.143 4.441 93 age of intrusion K=7.59% 9787 1 13.9 0.16 biotite conventional K-Ar 7. (K7-32A) "4.962E-04, 0.581E-04, 1.1167E-04" 8.251 1.657 64 age of intrusion K=6.849% 9787 2 12.39 0.53 hornblende conventional K-Ar 7. (K7-32A) "4.962E-04, 0.581E-04, 1.1167E-04" 0.4203 0.0752 15 age of intrusion K=0.3489% 9788 1 13.2 0.6 biotite conventional K-Ar M "4.962E-04, 0.581E-04, 1.1167E-04" 8.775 1.723 62 age of intrusion "(SEE MARLOW AND OTHERS, 1973)" 9788 2 13.7 1.5 hornblende conventional K-Ar M "4.962E-04, 0.581E-04, 1.1167E-04" 0.3955 0.0803 17 age of intrusion "(SEE MARLOW AND OTHERS, 1973)" 9798 1 95 18 hornblende conventional K-Ar KRO1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0913 0.1331 18 K=0.0758% THIS IS A REDUCED AGE 9801 1 122 1.3 hornblende conventional K-Ar KRO4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.7 3.0022 90 K=1.411% A REDUCED AGE 9802 1 190 5 hornblende conventional K-Ar KRO5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4462 1.2848 86 minimum age of metamorphic crystallization K=0.37035% 9803 1 108 12 hornblende conventional K-Ar KRO6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0766 0.1229 19 K=0.0636% A REDUCED AGE 9804 1 92 18 hornblende conventional K-Ar KRO7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0767 0.1039 12 K=0.0637% A REDUCED AGE 9807 1 240 30 hornblende conventional K-Ar KSM2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0364 0.1344 34 minimum age of intrusion K=0.0302% 9810 1 193 4 hornblende conventional K-Ar KSM5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4722 1.3837 78 minimum age of metamorphic crystallization K=0.3920% 9811 1 113 11 actinolite conventional K-Ar KSM6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.107 0.179 35 K=0.0888% A REDUCED AGE 9812 1 71 1.6 actinolite conventional K-Ar KSM7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2944 0.3028 65 K=0.2444% A REDUCED AGE 9813 1 176 4 hornblende conventional K-Ar KSM8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4624 1.2285 80 minimum age of metamorphic crystallization K=0.3838% 9813 2 87 18 albite conventional K-Ar KSM8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0934 0.1191 18 K=0.0775% A REDUCED AGE 9814 1 127 6 hornblende conventional K-Ar JI1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1623 0.3083 51 K=0.1347% A REDUCED AGE 9816 1 133 3 hornblende conventional K-Ar JI3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4022 0.7963 67 K=0.3339% A REDUCED AGE 9817 1 97.2 2 biotite conventional K-Ar JI4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.657 1.3876 86 K=8.016% A REDUCED AGE 9817 2 115 3 hornblende conventional K-Ar JI4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5091 0.8673 74 K=0.4226% A REDUCED AGE 9839 1 128 4 hornblende conventional K-Ar KB20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1907 0.3631 42 age of intrusion K=0.1583% 9840 1 142 6 hornblende conventional K-Ar KB21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2358 0.4944 24 K=0.1957% THIS AGE IS TOO OLD; EXCESS ARGON MAY BE PRESENT 9841 1 123 3 hornblende conventional K-Ar KB22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.276 0.5067 45 K=0.2291% AGE OF ROCK IS PROBABLY 117 M.Y.; THE 123 M.Y. AGE IS A BIT TOO OLD. 9841 2 400 80 anorthite conventional K-Ar KB22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0082 0.0527 12 K=0.0068% A SPURIOUS AGE; EXCESS ARGON IS PROBABLY PRESENT. 9842 1 19 0.7 whole rock conventional K-Ar 1. (WA-058A) "4.962E-04, 0.581E-04, 1.1167E-04" 5.54 1.523 65 "K=4.62, 4.58%" MAY BE THE AGE OF MINERALIZATION 9843 1 19.6 0.7 whole rock conventional K-Ar 2. (WA-11) "4.962E-04, 0.581E-04, 1.1167E-04" 2.32 0.6586 25 age of intrusion "K=1.90, 1.95%" 9844 1 13.4 0.9 hornblende conventional K-Ar 3. (NS-11) "4.962E-04, 0.581E-04, 1.1167E-04" 0.445 0.086 13 age of intrusion "K=0.370, 0.368%" 9845 1 13.4 1.2 whole rock conventional K-Ar 4. (BR-6) "4.962E-04, 0.581E-04, 1.1167E-04" 1.003 0.1945 11 age of intrusion "K=0.837, 0.829%" 9846 1 21.7 0.8 whole rock conventional K-Ar 5. (BO-7) "4.962E-04, 0.581E-04, 1.1167E-04" 1.64 0.5163 56 age of intrusion "K=1.38, 1.35%" 9847 1 15.5 0.7 hornblende conventional K-Ar 1. (1) "4.962E-04, 0.581E-04, 1.1167E-04" 2.9 0.653 32 age of volcanism K=2.41% 9848 1 17.8 0.7 hornblende conventional K-Ar 2. (7O) "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 0.171 49 age of volcanism K=0.55% 9849 1 16.9 1.2 hornblende conventional K-Ar 3. (7D) "4.962E-04, 0.581E-04, 1.1167E-04" 0.65 0.159 20 age of volcanism K=0.54% 9850 1 16.2 0.5 plagioclase conventional K-Ar 4. (34) "4.962E-04, 0.581E-04, 1.1167E-04" 0.795 0.188 72 age of volcanism K=0.66% 9851 1 16.5 1.1 whole rock conventional K-Ar 2. (DB-15) "4.962E-04, 0.581E-04, 1.1167E-04" 0.97 0.3851 23 THE AVERAGE OF 4 K-AR AGES FOR BASALT FLOWS AT DUG BAR IS 16.9+/-0.3 M.Y.--THE BEST AGE FOR THE IMNAHA BASALT. 9852 1 17.4 0.3 whole rock conventional K-Ar 3. (DB-19) "4.962E-04, 0.581E-04, 1.1167E-04" 1.003 0.253 56 THE AVERAGE OF 4 K-AR AGES FOR BASALT FLOWS AT DUG BAR IS 16.9+/-0.3 M.Y.--THE BEST AGE FOR THE IMNAHA BASALT. 9853 1 17 0.2 whole rock conventional K-Ar 4. (DB-23) "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.2209 37 THE AVERAGE OF 4 K-AR AGES FOR BASALT FLOWS AT DUG BAR IS 16.9+/-0.3 M.Y.--THE BEST AGE FOR THE IMNAHA BASALT. 9854 1 16.8 0.9 whole rock conventional K-Ar 1. (DB-12) "4.962E-04, 0.581E-04, 1.1167E-04" 0.848 0.2063 29 THE AVERAGE OF 4 K-AR AGES FOR BASALT FLOWS AT DUG BAR IS 16.9+/0.3 M.Y.--THE BEST AGE FOR THE IMNAHA BASALT. 9887 1 260.78 5 biotite conventional K-Ar DCP69-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.16 37 92 minimum age of intrusion "K=7.56, 7.64%" 9887 2 243.57 5 microcline conventional K-Ar DCP69-1 "4.72E-04, 0.585E-04, 1.19E-04*" 13.11 49.22 88 "K=10.83, 10.94%" AGE IS TOO YOUNG 9888 1 225.8 4 biotite conventional K-Ar DCP69-3 "4.72E-04, 0.585E-04, 1.19E-04*" 4.88 16.9 93 "K=4.13, 3.97%" AGE IS TOO YOUNG. 9888 2 214.61 4 hornblende conventional K-Ar DCP69-3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.146 3.76 63 "K=0.957, O.945%" AGE IS TOO YOUNG. 9889 1 223.73 4 microcline conventional K-Ar MG153-69 "4.72E-04, 0.585E-04, 1.19E-04*" 13.44 46.09 96 "K=11.34, 11.08, 11.07%" AGE IS TOO YOUNG 9890 1 231.69 4 microcline conventional K-Ar MG154-69 "4.72E-04, 0.585E-04, 1.19E-04*" 13.25 47.16 98 "K=11.02, 10.97%" AGE IS TOO YOUNG 9891 1 222.15 4 microcline conventional K-Ar MG155-69 "4.72E-04, 0.585E-04, 1.19E-04*" 12.81 43.6 95 "K=10.53, 10.73%" AGE IS TOO YOUNG 9892 1 227.69 3 microcline conventional K-Ar MG156-69 "4.72E-04, 0.585E-04, 1.19E-04*" 13 45.42 9497 "K=10.71, 10.87%; 40AR-RAD=101.4 AND 102.2XE-6 CC/GM" AGE IS TOO YOUNG 9893 1 232.54 4 orthoclase conventional K-Ar MG191-69 "4.72E-04, 0.585E-04, 1.19E-04*" 13.31 47.56 95 "K=11.00, 11.09%" AGE IS TOO YOUNG 9894 1 252.14 5 whole rock conventional K-Ar H202 "4.72E-04, 0.585E-04, 1.19E-04*" 2.885 11.24 88 "K=2.40, 2.39%" A MINIMUM AGE FOR THE TIME OF FAULTING 9895 1 340.74 6 biotite conventional K-Ar 69-274OA "4.72E-04, 0.585E-04, 1.19E-04*" 8.61 46.49 92 "K=7.01, 7.26, 7.17%" AGE IS TOO YOUNG 9896 1 283.19 4 biotite conventional K-Ar "4.72E-04, 0.585E-04, 1.19E-04*" 8.83 38.98 8987 age of intrusion "K=7.30, 7.36%; 40AR-RAD=87.6 AND 87.1XE-6 CC/GM" 9896 2 268.84 5 whole rock conventional K-Ar 69-2534 "4.72E-04, 0.585E-04, 1.19E-04*" 7.14 29.8 90 minimum age of intrusion "K=5.91, 5.95%" 9897 1 336.61 7 muscovite conventional K-Ar 883 "4.72E-04, 0.585E-04, 1.19E-04*" 10.77 57.38 94 minimum age of intrusion "K=8.95, 8.93%" 9897 2 284.4 6 K feldspar conventional K-Ar 883 "4.72E-04, 0.585E-04, 1.19E-04*" 7.91 35.08 84 "K=6.53, 6.61%" AGE IS TOO YOUNG. 9899 1 362 7 hornblende conventional K-Ar 885 "4.72E-04, 0.585E-04, 1.19E-04*" 1.4 8.08 93 age of metamorphic crystallization "K=1.17, 1.16%" 9899 2 341.87 7 biotite conventional K-Ar 885 "4.72E-04, 0.585E-04, 1.19E-04*" 9.47 51.32 90 "K=7.83, 7.90%" AGE IS TOO YOUNG 9902 1 197.93 7 albite conventional K-Ar 1144A "4.72E-04, 0.585E-04, 1.19E-04*" 0.22 0.6626 1619 COMPOSITION OF AN-3 40AR-RAD=1.47 AND 1.50XE-6 CC/GM AGE IS TOO YOUNG. 9902 2 245.67 5 biotite conventional K-Ar 1144B "4.72E-04, 0.585E-04, 1.19E-04*" 8.63 32.7 85 minimum age of intrusion COARSE-GRAINED BIOTITE "K=7.17, 7.16%" 9902 3 463.04 9 tourmaline conventional K-Ar 1144C "4.72E-04, 0.585E-04, 1.19E-04*" 0.05 0.38 52 COARSE TOURMALINE CRYSTAL K=0.04% DETERMINED BY X-RAY FLUORESCENCE SPURIOUS AGE--EXCESS ARGON PROBABLY PRESENT 9903 1 249.41 5 muscovite conventional K-Ar 1145A "4.72E-04, 0.585E-04, 1.19E-04*" 9.92 38.2 87 minimum age of intrusion COARSE-GRAINED MUSCOVITE "K=8.37, 8.10%" 9903 2 4780.91 97 beryl conventional K-Ar 1145B "4.72E-04, 0.585E-04, 1.19E-04*" 0.24 82 97 10-MM IN DIAMETER AND 15-MM LONG BERYL CRYSTAL K=0.20 DETERMINED BY X-RAY FLUORESCENCE "SPURIOUS AGE, EXCESS ARGON PROBABLY PRESENT" 9904 1 260.48 3 muscovite conventional K-Ar 1146A "4.72E-04, 0.585E-04, 1.19E-04*" 9.89 39.9 9282 age of intrusion "K=8.26, 8.16%; 40AR-RAD=90.0 AND 89.0XE-6 CC/GM" 9905 1 246.38 5 biotite conventional K-Ar 1167A "4.72E-04, 0.585E-04, 1.19E-04*" 7.63 29 94 FINE-GRAINED BIOTITE "K=6.29, 6.38%" AGE IS TOO YOUNG; GNEISS IS DATED AT 285 M.Y. BY WHOLE-ROCK RB-SR. 9913 1 1390.26 40 muscovite conventional K-Ar 5. (6-2-49MU) "4.72E-04, 0.584E-04, 1.19E-04*" 8.88 267.8 99 minimum age of metamorphic crystallization 9914 1 1540.65 50 hornblende conventional K-Ar 6. (0C188HB) "4.72E-04, 0.584E-04, 1.19E-04*" 0.269 9.425 91 minimum age of metamorphic crystallization 9915 1 1514.24 50 hornblende conventional K-Ar 7. (NFR-128HB) "4.72E-04, 0.584E-04, 1.19E-04*" 0.889 30.36 98 minimum age of metamorphic crystallization 9937 1 1231.98 40 biotite conventional K-Ar 26. (3-0-8B) "4.72E-04, 0.584E-04, 1.19E-04*" 6.21 158 99 age meaning uncertain (geologic factors) 9937 2 1389.63 40 hornblende conventional K-Ar 26. (3-0-8HB) "4.72E-04, 0.584E-04, 1.19E-04*" 1.52 45.81 99 minimum age of intrusion 9944 1 1389.45 40 hornblende conventional K-Ar 33. (LE3HB) "4.72E-04, 0.584E-04, 1.19E-04*" 0.905 27.27 97 age of intrusion 9969 1 25.05 0.31 adularia conventional K-Ar J47A "4.72E-04, 0.585E-04, 1.19E-04*" 15.57 5.654 73 MINERALIZATION OCCURRED 24.6 M.Y. AGO 9970 1 25.27 0.79 sericite conventional K-Ar KP-55871 "4.72E-04, 0.585E-04, 1.19E-04*" 8.76 3.21 43 MINERALIZATION OCCURRED 24.6 M.Y. AGO 9971 1 25.66 0.69 sericite conventional K-Ar BA-20065 "4.72E-04, 0.585E-04, 1.19E-04*" 9.225 3.432 72 "K20=9.11, 9.34%" MINERALIZATION OCCURRED 24.6 M.Y. AGO 9972 1 25.48 0.43 sericite conventional K-Ar DM-27967 "4.72E-04, 0.585E-04, 1.19E-04*" 8.295 3.065 69 "K20=8.29, 8.30%" MINERALIZATION OCCURRED 24.6 M.Y. AGO 9973 1 76.2 2.3 hornblende conventional K-Ar 1. (74AB75) "4.962E-04, 0.581E-04, 1.1167E-04" 0.495 0.5521 29 age of volcanism 9974 1 81.7 2.4 hornblende conventional K-Ar 2. (54AB75) "4.962E-04, 0.581E-04, 1.1167E-04" 0.494 0.5931 33 age of intrusion 9975 1 76.2 1.9 hornblende conventional K-Ar 3. (72AB74) "4.962E-04, 0.581E-04, 1.1167E-04" 0.458 0.6125 41 age of intrusion 9976 1 72.3 2.2 hornblende conventional K-Ar 4. (GB-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.528 0.5595 29 age of intrusion 9977 1 69.8 2.1 hornblende conventional K-Ar 5. (83AB75) "4.962E-04, 0.581E-04, 1.1167E-04" 0.516 5.2726 22 age of intrusion 9978 1 62.8 1.6 biotite conventional K-Ar 6. (CS-1-75) "4.962E-04, 0.581E-04, 1.1167E-04" 3.74 3.4441 64 AGE OF MINERALIZATION 9979 1 62.5 1.6 sericite conventional K-Ar 7. (D148-337) "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 9.5676 86 age of intrusion 9980 1 25.5 0.6 whole rock conventional K-Ar 8. (AB49-73) "4.962E-04, 0.581E-04, 1.1167E-04" 1.78 0.6587 77 age of intrusion 9981 1 153.99 5 hornblende conventional K-Ar 70CLE-12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.243 0.5624 68 age of intrusion "K20=0.242, 0.243%" 9982 1 163.95 8 hornblende conventional K-Ar 70CLE-30 "4.72E-04, 0.585E-04, 1.19E-04*" 0.079 0.1952 37 age of intrusion 9983 1 162.1 5 amphiboles conventional K-Ar 70CLE-35 "4.72E-04, 0.585E-04, 1.19E-04*" 0.234 0.5714 68 age of intrusion "K20=0.233, 0.235%" 9984 1 436.87 15 muscovite conventional K-Ar 13-HB-15 "4.72E-04, 0.585E-04, 1.19E-04*" 8.365 59.53 99 SOME PYROPHYLLITE PRESENT "K20=8.42, 8.31%" POSSIBLE AGE OF MINERALIZATION AND ALTERATION 9985 1 408.34 14 muscovite conventional K-Ar 13-HB-40 "4.72E-04, 0.585E-04, 1.19E-04*" 7.265 47.93 96 "K20=7.24, 7.29%" POSSIBLE AGE OF MINERALIZATION AND ALTERATION 9986 1 368.51 13 muscovite conventional K-Ar BLACKMON 1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.15 36.2 97 SOME QUARTZ PRESENT "K20=6.14, 6.16%" POSSIBLE AGE OF MINERALIZATION AND ALTERATION 9987 1 360.91 12 muscovite conventional K-Ar BLACKMON 2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.75 44.58 97 SOME QUARTZ PRESENT "K20=7.78, 7.72%" POSSIBLE AGE OF MINERALIZATION AND ALTERATION 9988 1 328.04 11 muscovite conventional K-Ar LM3-228 "4.72E-04, 0.585E-04, 1.19E-04*" 3.315 17.17 94 IMPURE MUSCOVITE "K20=3.29, 3.34%" POSSIBLE AGE OF MINERALIZATION AND ALTERATION 9989 1 322.76 11 muscovite conventional K-Ar LM3-257 "4.72E-04, 0.585E-04, 1.19E-04*" 6.9 35.11 97 "K20=6.87, 6.93%" POSSIBLE AGE OF MINERALIZATION AND ALTERATION 9990 1 11 0.4 whole rock conventional K-Ar PB-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.56 0.2995 58 PROBABLE TIME OF MINERALIZATION 9991 1 369.97 13 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 9.31 55.04 99 age of intrusion 9992 1 366.68 13 biotite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 9.24 54.09 99 age of intrusion 9993 1 59 2.2 biotite conventional K-Ar EL-3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.957 7.954 5676 initial age disturbed by later metamorphism "K=7.358, 7.513%" 9994 1 58.6 2.2 biotite conventional K-Ar EL-6B "4.962E-04, 0.581E-04, 1.1167E-04" 9.245 8.154 5659 initial age disturbed by later metamorphism "K=7.667, 7.682%" 9995 1 1029 35 biotite conventional K-Ar EL-24A "4.962E-04, 0.581E-04, 1.1167E-04" 8.322 168.9 9695 initial age disturbed by later metamorphism "K=6.953, 6.863%" 9996 1 57.9 2.2 biotite conventional K-Ar EL-26 "4.962E-04, 0.581E-04, 1.1167E-04" 9.088 7.925 6452 initial age disturbed by later metamorphism "K=7.587, 7.501%; 40AR-RAD=0.03195 AND 0.03140 PPM" 9997 1 57.9 2.2 biotite conventional K-Ar EL-27A "4.962E-04, 0.581E-04, 1.1167E-04" 9.371 8.162 4369 initial age disturbed by later metamorphism "K=7.767, 7.791%; 40AR-RAD=0.03427 AND 0.03097 PPM" 9997 2 70.1 2.7 K feldspar conventional K-Ar EL-27A "4.962E-04, 0.581E-04, 1.1167E-04" 5.077 5.378 2772 initial age disturbed by later metamorphism (K-FELDSPAR MAY BE FROM THE PEGMATITE STRINGERS--COMPILER) "K=4.239, 4.190%; 40AR-RAD=0.02045 AND 0.02054 PPM" 9998 1 68.4 2.5 biotite conventional K-Ar EL-28 "4.962E-04, 0.581E-04, 1.1167E-04" 8.568 8.841 7176 initial age disturbed by later metamorphism "K=7.103, 7.121%; 40AR-RAD=0.03526 AND 0.03541 PPM" 9999 1 67.2 2.5 biotite conventional K-Ar EL-29A "4.962E-04, 0.581E-04, 1.1167E-04" 8.869 8.987 6373 initial age disturbed by later metamorphism "K=7.376, 7.348%; 40AR-RAD=0.03694 AND 0.03490 PPM" 10000 1 147 6 K feldspar conventional K-Ar EL-29A "4.962E-04, 0.581E-04, 1.1167E-04" 4.984 11.32 7779 initial age disturbed by later metamorphism "K=4.160, 4.114%; 40AR-RAD=0.04645 AND 0.04401 PPM" 10025 1 297 11 hornblende conventional K-Ar -3 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10026 1 166 6 biotite conventional K-Ar BEL-252B/76 (30) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 10027 1 162 6 biotite conventional K-Ar BEL-849/76 (31) no decay constants given minimum age of intrusion ALTERED BIOTITE NO ANALYTICAL DATA GIVEN 10028 1 136 6 hornblende conventional K-Ar C-1-76 (36) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10029 1 312 11 biotite conventional K-Ar HILL-1-76 (37) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10030 1 103 4 biotite conventional K-Ar JRR-PARS (38) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10031 1 250 9 biotite conventional K-Ar JRR-GOR (39) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10032 1 191 10 biotite conventional K-Ar JRR-ORR (40) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10033 1 177 7 amphiboles conventional K-Ar WM-1-76 (41) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10034 1 214 9 biotite conventional K-Ar R-1-76 (44) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10035 1 112 5 biotite conventional K-Ar T-1-76 (45) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10036 1 95 8 whole rock conventional K-Ar MK-1 (46) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10037 1 411 5 biotite conventional K-Ar LT-1B (47) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10038 1 180 8 whole rock conventional K-Ar PM-2 (48) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 10039 1 121 5 whole rock conventional K-Ar CP-2A (49) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 10040 1 184 8 whole rock conventional K-Ar LW-5 (50) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 10041 1 200 9 whole rock conventional K-Ar GY-2 (51) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 10042 1 158 6 whole rock conventional K-Ar SL-2 (52) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10043 1 124 6 whole rock conventional K-Ar KP-2 (53) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 10044 1 348 12 biotite conventional K-Ar HAR/MA-1-76 (54) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 10044 2 518 30 hornblende conventional K-Ar HAR/MA-1-76 (54) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10045 1 400 14 biotite conventional K-Ar HAR/MA-2-76 (55) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10045 2 566 22 hornblende conventional K-Ar HAR/MA-2-76 (55) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10046 1 120 4 biotite conventional K-Ar -56 no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 10047 1 323 15 whole rock conventional K-Ar -57 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10048 1 351 13 biotite conventional K-Ar -58 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10049 1 344 13 whole rock conventional K-Ar -59 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10050 1 226 10 whole rock conventional K-Ar -60 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10051 1 69.3 3 whole rock conventional K-Ar (70A) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10052 1 110 5 whole rock conventional K-Ar (70B) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 10053 1 166 6 whole rock conventional K-Ar -71 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10054 1 133 7 hornblende conventional K-Ar -73 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10055 1 306 11 hornblende conventional K-Ar -77 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10056 1 278 13 whole rock conventional K-Ar -78 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 10057 1 1.46 0.03 sanidine conventional K-Ar 77G55 "4.962E-04, 0.581E-04, 1.1167E-04" 8.36 0.1762 24 age of volcanism "A K-AR ISOCHRON PLOT OF SANIDINE, PLAGIOCLASE, AND HORNBLENDE FROM THIS SAMPLE GIVES AN AGE OF 1.47+/-0.04 M.Y." 10057 2 1.5 0.03 plagioclase conventional K-Ar 77G55 "4.962E-04, 0.581E-04, 1.1167E-04" 1.98 0.0426 28 "A K-AR ISOCHRON PLOT OF SANIDINE, PLAGIOCLASE, AND HORNBLENDE FROM THIS SAMPLE GIVES AN AGE OF 1.47 M.Y." 10057 3 1.58 0.11 hornblende conventional K-Ar 77G55 "4.962E-04, 0.581E-04, 1.1167E-04" 0.56 0.0128 6 "A K-AR ISOCHRON PLOT OF SANIDINE, PLAGIOCLASE, AND HORNBLENDE FROM THIS SAMPLE GIVES AN AGE OF 1.47+/-0.04 M.Y." 10058 1 1.23 0.02 sanidine conventional K-Ar 77G56 "4.962E-04, 0.581E-04, 1.1167E-04" 7.21 0.1282 57 age of volcanism 10097 1 0.69 0.02 glass conventional K-Ar 72G001 "4.72E-04, 0.585E-04, 1.19E-04*" 5.1 0.0507 4429 age of volcanism 40AR-RAD=5.189 AND 4.948XE-12 MOL/GM 10098 1 0.68 0.03 glass conventional K-Ar 72G002 "4.72E-04, 0.585E-04, 1.19E-04*" 5.24 0.051 5316 age of volcanism "40AR-RAD=5.125, 5.070XE-12 MOL/GM" 10099 1 0.68 0.03 glass conventional K-Ar 72G003 "4.72E-04, 0.585E-04, 1.19E-04*" 5.25 0.0516 1735 age of volcanism 40AR-RAD=5.199 AND 5.131XE-12 MOL/GM 10100 1 0.69 14 glass conventional K-Ar 72G004 "4.72E-04, 0.585E-04, 1.19E-04*" 5.22 0.0518 3557 age of volcanism 40AR-RAD=5.312 AND 5.057XE-12 MOL/GM 10101 1 0.33 0.01 sanidine conventional K-Ar 72G005 "4.72E-04, 0.585E-04, 1.19E-04*" 10.96 0.0526 48 age of volcanism 10102 1 0.75 0.02 glass conventional K-Ar 72G006 "4.72E-04, 0.585E-04, 1.19E-04*" 5.02 0.0543 4645 age of volcanism 40AR-RAD=5.583 AND 5.280XE-12 MOL/GM 10103 1 0.11 0 sanidine conventional K-Ar 72G007 "4.72E-04, 0.585E-04, 1.19E-04*" 10.88 0.0172 64 age of volcanism 10104 1 0.09 0.01 sanidine conventional K-Ar 72G008 "4.72E-04, 0.585E-04, 1.19E-04*" 11.24 0.0146 934 age of volcanism 40AR-RAD=1.330 AND 1.590XE-12 MOL/GM 10105 1 0.11 0 sanidine conventional K-Ar 72G009 "4.72E-04, 0.585E-04, 1.19E-04*" 11.32 0.0174 3934 age of volcanism 40AR-RAD=1.735 AND 1.744XE-12 MOL/GM 10106 1 0.69 0.01 glass conventional K-Ar 72G010 "4.72E-04, 0.585E-04, 1.19E-04*" 5.07 0.0506 4453 age of volcanism 40AR-RAD=5.145 AND 4.967XE-12 MOL/GM 10107 1 0.48 0.01 sanidine conventional K-Ar 72G011 "4.72E-04, 0.585E-04, 1.19E-04*" 10.64 0.0737 4041 age of volcanism 40AR-RAD=7.440 AND 7.293XE-12 MOL/GM 10108 1 0.52 0.01 sanidine conventional K-Ar 72G012 "4.72E-04, 0.585E-04, 1.19E-04*" 10.45 0.0788 6276 age of volcanism 40AR-RAD=8.023 AND 7.730XE-12 MOL/GM 10109 1 0.68 0.01 glass conventional K-Ar 72G013 "4.72E-04, 0.585E-04, 1.19E-04*" 5.14 0.0501 5442 age of volcanism 40AR-RAD=4.992 AND 5.036XE-12 MOL/GM 10110 1 0.65 0.01 glass conventional K-Ar 72G014 "4.72E-04, 0.585E-04, 1.19E-04*" 5.15 0.0484 5734 age of volcanism 40AR-RAD=4.958 AND 4.725XE-12 MOL/GM 10111 1 0.15 0.07 whole rock conventional K-Ar 72G015 "4.72E-04, 0.585E-04, 1.19E-04*" 1.654 0.0037 3 age of volcanism 10112 1 0.16 0.03 whole rock conventional K-Ar 72G016 "4.72E-04, 0.585E-04, 1.19E-04*" 1.663 0.0037 9 age of volcanism 10113 1 0.12 0 sanidine conventional K-Ar 72G017 "4.72E-04, 0.585E-04, 1.19E-04*" 10.63 0.0181 2532 age of volcanism 40AR-RAD=1.890 AND 1.728XE-12 MOL/GM 10114 1 0.23 0.08 whole rock conventional K-Ar 73G001 "4.72E-04, 0.585E-04, 1.19E-04*" 2.13 0.007 3 age of volcanism 10115 1 0.15 0.01 whole rock conventional K-Ar 73G008 "4.72E-04, 0.585E-04, 1.19E-04*" 2 0.0043 9 age of volcanism 10116 1 0.1 0.01 whole rock conventional K-Ar 73G009 "4.72E-04, 0.585E-04, 1.19E-04*" 1.63 0.0024 134 age of volcanism 40AR-RAD=0.271 AND 0.201XE-12 MOL/GM 10117 1 2.95 0.09 whole rock conventional K-Ar 73G010 "4.72E-04, 0.585E-04, 1.19E-04*" 3.01 0.1279 70 age of volcanism 10118 1 0.13 0.03 whole rock conventional K-Ar 73G012 "4.72E-04, 0.585E-04, 1.19E-04*" 2.26 0.0043 65 age of volcanism 40AR-RAD=0.482 AND 0.372XE-12 MOL/GM 10119 1 0.07 0.01 whole rock conventional K-Ar 73G014 "4.72E-04, 0.585E-04, 1.19E-04*" 1.82 0.0017 44 age of volcanism 40AR-RAD=0.148 AND 0.194XE-12 MOL/GM 10120 1 1.98 0.05 sanidine conventional K-Ar 73G016 "4.72E-04, 0.585E-04, 1.19E-04*" 9.75 0.2775 62 age of volcanism 10121 1 0.36 0.01 sanidine conventional K-Ar 73G017 "4.72E-04, 0.585E-04, 1.19E-04*" 11.34 0.0592 5658 age of volcanism 40AR-RAD=6.029 AND 5.812XE-12 MOL/GM 10121 2 0.52 0.1 biotite conventional K-Ar 73G017 "4.72E-04, 0.585E-04, 1.19E-04*" 8.93 0.0664 5 minimum age of volcanism 10122 1 0.15 0.03 biotite conventional K-Ar 73G018 "4.72E-04, 0.585E-04, 1.19E-04*" 8.6 0.0182 43 age of volcanism 40AR-RAD=2.212 AND 1.422XE-12 MOL/GM 10123 1 0.14 0.08 biotite conventional K-Ar 73G019 "4.72E-04, 0.585E-04, 1.19E-04*" 7.12 0.0146 3 age of volcanism 10124 1 0.1 0.01 whole rock conventional K-Ar 73G021 "4.72E-04, 0.585E-04, 1.19E-04*" 1.57 0.0022 65 age of volcanism 40AR-RAD=0.211 AND 0.225XE-12 MOL/GM 10125 1 0.05 0.01 sanidine conventional K-Ar 73G023 "4.72E-04, 0.585E-04, 1.19E-04*" 7.76 0.0058 9 age of volcanism 10126 1 0.12 0.05 biotite conventional K-Ar 73G024 "4.72E-04, 0.585E-04, 1.19E-04*" 8.22 0.0144 2 age of volcanism 10127 1 0.09 0.01 whole rock conventional K-Ar 73G025 "4.72E-04, 0.585E-04, 1.19E-04*" 2.63 0.0034 715 age of volcanism 40AR-RAD=0.366 AND 0.320XE-12 MOL/GM 10128 1 0.08 0.01 sanidine conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.765 0.0113 13 age of volcanism "K20=9.75, 9.78%" 10129 1 0.04 0.03 whole rock conventional K-Ar 2A. "4.72E-04, 0.585E-04, 1.19E-04*" 1.473 0.0008 2 age of volcanism 10130 1 3.32 0.1 whole rock conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 1.354 0.0648 39 age of volcanism "K20=1.355,1.353%" 10131 1 0.07 0.03 glass conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 4.48 0.0046 4 age of volcanism 10132 1 0.56 0.23 glass conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 4.44 0.0356 22 maximum age of volcanism "K20=4.430, 4.450%; 40AR-RAD=3.338 AND 3.792XE-12 MOL/GM." 10133 1 0.1 0.03 glass conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 4.5 0.0065 4 age of volcanism 10134 1 glass 10 "4.72E-04, 0.585E-04, 1.19E-04" 4.35 0 "NO AGE CALCULATED; K20=4.370, 4.330%" AGE ESTIMATED TO BE LESS THAN 0.3 M.Y. 10135 1 0.99 0.19 glass conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 4.485 0.0638 5 maximum age of volcanism "K20=4.470, 4.500%" 10136 1 0.24 0.03 glass conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 4.35 0.0153 15 age of volcanism 10137 1 0.29 0.03 glass conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 4.61 0.0194 11 age of volcanism "K20=4.600, 4.620%" 10138 1 0.1 0.07 glass conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 5 0.0071 1 age of volcanism 10139 1 0.06 0.02 glass conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 4.34 0.0036 5 age of volcanism "K20=4.330, 4.350%" 10140 1 glass 18 "4.72E-04, 0.585E-04, 1.19E-04" 4.65 0 NO AGE CALCULATED AGE ESTIMATED TO BE LESS THAN 0.1 M.Y. 10141 1 whole rock 20 "4.72E-04, 0.585E-04, 1.19E-04" 4.71 0 "NO AGE CALCULATED; K20=4.700, 4.720%" AGE ESTIMATED TO BE LESS THAN 0.2 M.Y. 10142 1 0.09 0.04 glass conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 4.73 0.006 4 age of volcanism 10143 1 0.09 0.02 glass conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 4.82 0.0063 7 age of volcanism 10144 1 0.04 0.02 glass conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 4.37 0.0028 3 age of volcanism 10145 1 0.09 0.03 glass conventional K-Ar 27 "4.72E-04, 0.585E-04, 1.19E-04*" 4.53 0.006 7 age of volcanism 10261 1 297 15 biotite conventional K-Ar 33. (SC2.1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10262 1 294 15 biotite conventional K-Ar 33. (SC2.3) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10263 1 303 18 biotite conventional K-Ar 33. (SD3.3) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10264 1 296 17 biotite conventional K-Ar 33. (NJ1.1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10265 1 298 17 biotite conventional K-Ar 33. (NK2.1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10267 1 295 17 biotite conventional K-Ar 33. (SH1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10268 1 232 14 whole rock conventional K-Ar 33. (SR2.2) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN AGE IS PROBABLY TOO YOUNG FOR AGE OF CRYSTALLIZATION 10269 1 47 5 zeolite conventional K-Ar 33. (X1) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN MINIMUM AGE FOR FAULT MOVEMENT 10272 1 302 7 biotite conventional K-Ar 35 (BP-7) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN A COOLING AGE 10273 1 296 9 hornblende conventional K-Ar 35. (B-28) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN PROBABLY A COOLING AGE 10274 1 225 1 K feldspar conventional K-Ar 35. (GTP7) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN AGE IS PROBABLY TOO YOUNG FOR AGE OF CRYSTALLIZATION 10275 1 299 9 muscovite conventional K-Ar 36. (S2A) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN A COOLING AGE 10276 1 236 10 whole rock conventional K-Ar 70 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10277 1 191 7 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10278 1 186 6 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 10279 1 154 4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN MAY BE A MINIMUM AGE OF MOVEMENT ON A FAULT 10280 1 154 4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN MAY BE A MINIMUM AGE OF MOVEMENT ON A FAULT 10281 1 259 10 whole rock conventional K-Ar X81A-16A "4.962E-04, 0.581E-04, 1.1167E-04" 0.217 71 age not evaluated "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT." 10281 2 238 30 whole rock conventional K-Ar X81A-16A "4.962E-04, 0.581E-04, 1.1167E-04" 0.217 5 age not evaluated SERPENTINIZED OLIVINE DIABASE "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT." 10282 1 88 30 zeolite conventional K-Ar Z3-B1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.65 53 "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT" MAY BE A MINIMUM AGE OF FAULT MOVEMENT. 10283 1 306 5 biotite conventional K-Ar A-72 "4.962E-04, 0.581E-04, 1.1167E-04" 5.69 97 "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT" A COOLING AGE 10283 2 322 9 hornblende conventional K-Ar A-72 "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 82 "P0TASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT." A COOLING AGE 10284 1 316 12 hornblende conventional K-Ar A-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.75 85 "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT" A COOLING AGE 10284 2 307 7 whole rock conventional K-Ar A-32 "4.962E-04, 0.581E-04, 1.1167E-04" 1.23 93 "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT" A COOLING AGE 10285 1 328 8 biotite conventional K-Ar A-32 "4.962E-04, 0.581E-04, 1.1167E-04" 7.64 95 "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM LAW ENGINEERING TESTING COMPANY REPORT" A COOLING AGE 10285 2 366 11 whole rock conventional K-Ar A-32 "4.962E-04, 0.581E-04, 1.1167E-04" 1.36 91 age not evaluated "POTASSIUM VALUE MAY BE K%, NOT K20%; THESE VALUES CAME FROM A LAW ENGINEERING TESTING COMPANY REPORT." 10287 1 237 10 whole rock conventional K-Ar X81A-19A "4.962E-04, 0.581E-04, 1.1167E-04" 0.143 66 age not evaluated "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM A LAW ENGINEERING TESTING COMPANY REPORT." 10287 2 233 10 whole rock conventional K-Ar X81A-19A "4.962E-04, 0.581E-04, 1.1167E-04" 0.148 51 age not evaluated "POTASSIUM VALUE MAY BE K%, NOT K20%; VALUE CAME FROM A LAW ENGINEERING TESTING COMPANY REPORT." 10317 1 276 4 hornblende 39Ar-40Ar incremental (plateau) 1 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10318 1 273 5 hornblende 39Ar-40Ar incremental (plateau) 2A "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10319 1 237 5 biotite 39Ar-40Ar incremental (plateau) 2B "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10319 2 236 4 muscovite 39Ar-40Ar incremental (plateau) 2B "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10320 1 235 4 biotite 39Ar-40Ar incremental (plateau) 3 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10321 1 227 5 biotite 39Ar-40Ar incremental (plateau) 4 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10322 1 240 4 biotite 39Ar-40Ar incremental (plateau) 5 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10323 1 267 5 hornblende 39Ar-40Ar incremental (plateau) 6 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10323 2 237 4 biotite 39Ar-40Ar incremental (plateau) 6 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10324 1 240 4 biotite 39Ar-40Ar incremental (plateau) 7B "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10325 1 274 5 hornblende 39Ar-40Ar incremental (plateau) 7A "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10325 2 246 5 biotite 39Ar-40Ar incremental (plateau) 7A "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10326 1 240 4 biotite 39Ar-40Ar incremental (plateau) 8 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10327 1 241 4 biotite 39Ar-40Ar incremental (plateau) 9 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10328 1 241 4 biotite 39Ar-40Ar incremental (plateau) 10 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE A COOLING AGE 10336 1 15.1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 5.54 1.213 49 age of volcanism ANALYTICAL DATA PROVIDED BY P.L. GUTH 10337 1 15.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 5.54 1.265 33 age of volcanism ANALYTICAL DATA PROVIDED BY P.L. GUTH 10338 1 150 whole rock conventional K-Ar RDV1-1AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.196 0.4417 9 age of intrusion K=0.163% 10339 1 204 whole rock conventional K-Ar RDV1-2AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.163 0.5087 6 maximum age of intrusion K=0.135% 10340 1 297 whole rock conventional K-Ar RDV1-3AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.172 0.8032 36 K=0.143% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10341 1 268 whole rock conventional K-Ar RDV1-4AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.206 0.8522 34 K=0.171% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10342 1 288 whole rock conventional K-Ar RDV1-5AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.198 0.8879 28 K=0.164% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10343 1 297 whole rock conventional K-Ar RDV1-6AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.184 0.8567 22 K=0.153% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10344 1 1269 whole rock conventional K-Ar RDV4-1AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.171 4.533 82 K=0.142% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10345 1 242 whole rock conventional K-Ar RDV14-1AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.213 0.7987 32 K=0.177% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10346 1 334 whole rock conventional K-Ar RDV14-2AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.253 1.334 55 K=0.210% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10347 1 391 whole rock conventional K-Ar RDV14-3AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.507 3.186 58 K=0.421% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10348 1 353 whole rock conventional K-Ar RDV14-4AC "4.962E-04, 0.581E-04, 1.1167E-04" 0.591 3.315 58 K=O.491% SPURIOUS AGE; EXCESS RADIOGENIC AR-40 PRESENT 10350 1 1598 54 biotite conventional K-Ar W55 "4.962E-04, 0.581E-04, 1.1167E-04" 9.04 334.3 99 age of uplift and cooling 10352 1 1615 55 biotite conventional K-Ar W249B "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 323.7 99 age of uplift and cooling 10497 1 78 3.1 sanidine conventional K-Ar 1. (JKR-54) "4.962E-04, 0.581E-04, 1.1167E-04" 3.812 4.4986 7964 age of volcanism SANIDINE AND QUARTZ MIXTURE "K=3.145, 3.184%; 40AR-RAD=0.01805, 0.01792 X E-10 MOL/GM" 10497 2 69 2.6 biotite conventional K-Ar 2. (JKR-54) "4.962E-04, 0.581E-04, 1.1167E-04" 7.69 8.013 7969 ALTERED BIOTITE "K=6.450, 6.317%; 40AR-RAD=0.03136, 0.03269 PPM" "AGE IS TOO YOUNG; REVISED AGE OF 74.1 M.Y. REPORTED BY BROOKINS (ISOCHRON/WEST, NO. 35, 1982)." 10498 1 72.7 3 sanidine conventional K-Ar 3. (JKR-62) "4.962E-04, 0.581E-04, 1.1167E-04" 3.112 3.418 4179 age of volcanism SANIDINE AND QUARTZ MIXTURE "K=2.562, 2.604%; 40AR-RAD=0.01386, 0.01346 X E-10 MOL/GM" 10498 2 53.8 2.4 biotite conventional K-Ar 4. (JKR-62) "4.962E-04, 0.581E-04, 1.1167E-04" 1.747 1.414 1913 ALTERED BIOTITE "K=1.439, 1.461%; 40AR-RAD=0.005396, 0.005907 PPM" AGE IS TOO YOUNG--PROBABLY DUE TO THE ALTERATION OF THE BIOTITE. 10499 1 76.5 3.1 sanidine conventional K-Ar 5. (JKR-4) "4.962E-04, 0.581E-04, 1.1167E-04" 2.93 3.392 5644 age of volcanism SANIDINE AND QUARTZ MIXTURE "K=2.440, 2.425%; 40AR-RAD=0.01363, 0.01348 X E-10 MOL/GM" 10500 1 76.8 3.1 sanidine conventional K-Ar 6. (JKR-93) "4.962E-04, 0.581E-04, 1.1167E-04" 2.92 3.391 6846 SANIDINE AND QUARTZ MIXTURE "K=2.430, 2.418%; 40AR-RAD=0.01301, 0.01410XE-10 MOL/GM" "AGE TOO OLD; AN AGE OF 73.1 M.Y. IS REPORTED BY BROOKINS (ISOCHRON/WEST, NO. 35, 1982) FOR UP-GRADED SANIDINE CONCENTRATE FROM THIS ASH SAMPLE." 10501 1 27.3 1 whole rock conventional K-Ar 1. (612-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.765 0.6994 62 age of volcanism "K20=1.77, 1.76%" 10502 1 47.3 1.6 whole rock conventional K-Ar 2. (115-2) "4.962E-04, 0.581E-04, 1.1167E-04" 3.09 2.133 96 age of volcanism "K20=3.10, 3.08%" 10503 1 47 1.6 whole rock conventional K-Ar 3. (114-1) "4.962E-04, 0.581E-04, 1.1167E-04" 2.53 1.734 88 age of volcanism 10504 1 50.4 1.7 biotite conventional K-Ar 4. (395-1) "4.962E-04, 0.581E-04, 1.1167E-04" 8.465 6.231 83 age of volcanism "K20=8.47, 8.46%" 10505 1 47.9 1.6 whole rock conventional K-Ar 5. (507-2) "4.962E-04, 0.581E-04, 1.1167E-04" 2.7 1.886 94 age of volcanism "K20=2.73, 2.67%" 10506 1 46.1 1.6 whole rock conventional K-Ar 6. (627-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.56 1.05 87 age of volcanism 10507 1 46.7 1.6 whole rock conventional K-Ar 7. (621-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.275 0.8675 82 age of volcanism "K20=1.28, 1.27%" 10508 1 49.9 1.7 whole rock conventional K-Ar 8. (648-1) "4.962E-04, 0.581E-04, 1.1167E-04" 1.02 0.7435 85 age of volcanism 10509 1 49.8 1.9 whole rock conventional K-Ar 9. (429-1-2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.325 0.9627 88 age of volcanism "K20=1.32, 1.33%" 10510 1 45.6 1.6 whole rock conventional K-Ar 10. (836-2) "4.962E-04, 0.581E-04, 1.1167E-04" 1.05 0.6976 73 age of volcanism 10511 1 47.1 1.6 whole rock conventional K-Ar 11. (1-15) "4.962E-04, 0.581E-04, 1.1167E-04" 2.675 1.839 86 age of volcanism "K20=2.67, 2.68%" 10520 1 14.7 0.2 whole rock conventional K-Ar 1. (7798) "4.962E-04, 0.581E-04, 1.1167E-04" 1.434 0.3054 27 age of volcanism K=1.190% 10521 1 16.5 0.3 whole rock conventional K-Ar 2. (7703) "4.962E-04, 0.581E-04, 1.1167E-04" 1.348 0.3221 59 age of volcanism K=1.119% 10521 2 15.9 0.4 whole rock conventional K-Ar 2. (7703) "4.962E-04, 0.581E-04, 1.1167E-04" 1.348 0.3101 58 age of volcanism K=1.119% 10521 3 15.9 whole rock 39Ar-40Ar total fusion 2. (7703) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism ANALYTICAL DATA NOT GIVEN 40AR-39AR TOTAL-GAS AGE 10521 4 15.7 0.6 whole rock 39Ar-40Ar incremental (plateau) 2. (7703) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism ANALYTICAL DATA NOT GIVEN FOR 40AR-39AR PLATEAU AGE 10522 1 14.8 0.4 whole rock conventional K-Ar 3. (7765) "4.962E-04, 0.581E-04, 1.1167E-04" 1.382 0.2955 42 age of volcanism K=1.147% 10523 1 14.6 0.4 whole rock conventional K-Ar 4. (7723AW) "4.962E-04, 0.581E-04, 1.1167E-04" 1.736 0.3659 45 age of volcanism K=1.441% 10524 1 15.5 0.4 whole rock conventional K-Ar 5. (7763) "4.962E-04, 0.581E-04, 1.1167E-04" 1.407 0.3154 52 age of volcanism "K=1.167, 1.169%" 10524 2 15.4 0.4 whole rock conventional K-Ar 5. (7763) "4.962E-04, 0.581E-04, 1.1167E-04" 1.407 0.3132 51 age of volcanism "K=1.167, 1.169%" 10525 1 16.6 whole rock 39Ar-40Ar total fusion 6. (7726) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN FOR 40AR-39AR TOTAL-GAS AGE 10525 2 15.8 1.1 whole rock 39Ar-40Ar incremental (plateau) 6. (7726) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN FOR 40AR-39AR PLATEAU AGE 10526 1 15.5 0.2 whole rock conventional K-Ar 7. (7727) "4.962E-04, 0.581E-04, 1.1167E-04" 1.575 0.3503 52 age of volcanism K=1.307% 10527 1 15 0.4 whole rock conventional K-Ar 8. (7709) "4.962E-04, 0.581E-04, 1.1167E-04" 1.397 0.3037 52 age of volcanism K=1.160% 10528 1 15.7 0.4 whole rock conventional K-Ar 9. (7757) "4.962E-04, 0.581E-04, 1.1167E-04" 1.803 0.4082 49 age of volcanism K=1.497% 10529 1 15.6 0.8 whole rock conventional K-Ar 10. (7722) "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 0.2934 43 age of volcanism K=1.079% 10530 1 14.9 0.4 whole rock conventional K-Ar 11. (7794) "4.962E-04, 0.581E-04, 1.1167E-04" 1.367 0.2951 61 age of volcanism K=1.135% 10531 1 15.2 0.2 whole rock conventional K-Ar 12. (7755) "4.962E-04, 0.581E-04, 1.1167E-04" 1.773 0.3898 62 age of volcanism K=1.472% 10532 1 15.7 0.6 whole rock conventional K-Ar 13. (7774) "4.962E-04, 0.581E-04, 1.1167E-04" 1.752 0.4144 32 age of volcanism "K=1.512, 1.397%" 10532 2 14.9 0.6 whole rock conventional K-Ar 13. (7774) "4.962E-04, 0.581E-04, 1.1167E-04" 1.752 0.3636 31 age of volcanism "K=1.512, 1.397%" 10533 1 15 0.4 whole rock conventional K-Ar 14. (7795) "4.962E-04, 0.581E-04, 1.1167E-04" 1.272 0.2754 48 age of volcanism K=1.056% 10534 1 15.2 0.4 whole rock conventional K-Ar 15. (78SP49) "4.962E-04, 0.581E-04, 1.1167E-04" 1.814 0.3997 54 age of volcanism K=1.506% 10535 1 15.1 0.5 whole rock conventional K-Ar 16. (7797AW) "4.962E-04, 0.581E-04, 1.1167E-04" 1.672 0.3644 41 age of volcanism K=1.388% 10536 1 14.5 0.4 whole rock conventional K-Ar 17. (7729) "4.962E-04, 0.581E-04, 1.1167E-04" 1.193 0.2508 48 age of volcanism K=0.990% 10537 1 15.5 whole rock 39Ar-40Ar total fusion 18. (7715) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN FOR 40AR-39AR TOTAL-GAS AGE 10537 2 15.8 1.1 whole rock 39Ar-40Ar incremental (plateau) 18. (7715) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN FOR 40AR-39AR PLATEAU AGE 10538 1 41.5 0.9 whole rock conventional K-Ar 19. (77113) "4.962E-04, 0.581E-04, 1.1167E-04" 1.318 0.7971 87 age of volcanism K=1.094% 10539 1 39.2 0.5 whole rock conventional K-Ar 20. (78LB42) "4.962E-04, 0.581E-04, 1.1167E-04" 1.196 0.6822 20 age of volcanism K=0.993% 10540 1 37 1.3 whole rock conventional K-Ar 21. (7775) "4.962E-04, 0.581E-04, 1.1167E-04" 1.128 0.6075 23 age of volcanism K=0.936 10541 1 36.2 0.5 whole rock conventional K-Ar 22. (7778) "4.962E-04, 0.581E-04, 1.1167E-04" 0.481 0.2525 56 age of volcanism K=0.399% 10542 1 39.7 1.4 whole rock conventional K-Ar 23. (78CG5) "4.962E-04, 0.581E-04, 1.1167E-04" 0.3 0.1733 7 age of volcanism K=0.249% 10543 1 38.7 0.5 whole rock conventional K-Ar 24. (78CG7) "4.962E-04, 0.581E-04, 1.1167E-04" 0.797 0.449 38 age of volcanism K=0.662% 10544 1 37.7 0.9 whole rock conventional K-Ar 25. (78CG2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.867 0.4755 64 age of volcanism K=0.720% 10545 1 32.9 0.4 whole rock conventional K-Ar 26. (77110) "4.962E-04, 0.581E-04, 1.1167E-04" 0.871 0.4169 40 age of volcanism K=0.723% 10546 1 33.9 0.8 whole rock conventional K-Ar 27. (77112) "4.962E-04, 0.581E-04, 1.1167E-04" 1.546 0.7622 67 age of volcanism K=1.283% 10547 1 35.2 0.8 whole rock conventional K-Ar 28. (78HAL17) "4.962E-04, 0.581E-04, 1.1167E-04" 1.178 0.6037 65 age of volcanism K=0.978% 10548 1 34.7 0.4 whole rock conventional K-Ar 29. (77121) "4.962E-04, 0.581E-04, 1.1167E-04" 0.728 0.3673 41 age of volcanism K=0.604% 10549 1 29.7 0.4 whole rock conventional K-Ar 30. (78BR31) "4.962E-04, 0.581E-04, 1.1167E-04" 1.155 0.4972 43 age of volcanism K=0.959% 10550 1 31.4 0.5 whole rock conventional K-Ar 31. (78BR19) "4.962E-04, 0.581E-04, 1.1167E-04" 0.437 0.1997 42 age of volcanism K=0.363% 10551 1 28.9 0.5 whole rock conventional K-Ar 32. (78BR22) "4.962E-04, 0.581E-04, 1.1167E-04" 1.762 0.7387 79 age of volcanism K=1.463% 10552 1 31.8 0.7 whole rock conventional K-Ar 33. (78BR12) "4.962E-04, 0.581E-04, 1.1167E-04" 0.886 0.397 68 age of volcanism "K=0.713, 0.758%" 10552 2 31 1.2 whole rock conventional K-Ar 33. (78BR12) "4.962E-04, 0.581E-04, 1.1167E-04" 0.886 0.4115 32 age of volcanism "K=0.713, 0.758%" 10553 1 25.3 0.4 whole rock conventional K-Ar 34. (77118) "4.962E-04, 0.581E-04, 1.1167E-04" 1.289 0.4731 34 age of volcanism K=1.070% 10554 1 25.1 1.1 whole rock conventional K-Ar 35. (77100) "4.962E-04, 0.581E-04, 1.1167E-04" 0.512 0.1866 30 age of volcanism K=0.425% 10555 1 24.6 0.3 whole rock conventional K-Ar 36. (7792) "4.962E-04, 0.581E-04, 1.1167E-04" 0.447 0.1593 17 age of volcanism K=0.371% 10556 1 25.4 0.9 whole rock conventional K-Ar 37. (78BR36) "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.181 38 age of volcanism "K=0.408, 0.406%" 10556 2 24.1 0.8 whole rock conventional K-Ar 37. (78BR36) "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.1712 40 age of volcanism "K=0.408, 0.407%" 10557 1 18.5 1 whole rock conventional K-Ar 38. (7799) "4.962E-04, 0.581E-04, 1.1167E-04" 0.467 0.1242 22 age of volcanism "K=0.385, 0.390%" 10557 2 17.9 0.9 whole rock conventional K-Ar 38. (7799) "4.962E-04, 0.581E-04, 1.1167E-04" 0.467 0.1217 25 age of volcanism "K=0.385, 0.390%" 10558 1 21.1 1.1 whole rock conventional K-Ar 39. (7791) "4.962E-04, 0.581E-04, 1.1167E-04" 0.427 0.1298 23 age of volcanism "K=0.352, 0.357%" 10558 2 21 1 whole rock conventional K-Ar 39. (7791) "4.962E-04, 0.581E-04, 1.1167E-04" 0.427 0.131 27 age of volcanism "K=0.352, 0.357%" 10559 1 29.7 0.8 whole rock conventional K-Ar 40. (7786) "4.962E-04, 0.581E-04, 1.1167E-04" 0.735 0.3165 16 age of volcanism K=0.610% 10560 1 28.3 1.1 whole rock conventional K-Ar 41. (7790) "4.962E-04, 0.581E-04, 1.1167E-04" 0.516 0.212 32 age of volcanism "K=0.428, 0.429%" 10560 2 27 1 whole rock conventional K-Ar 41. (7790) "4.962E-04, 0.581E-04, 1.1167E-04" 0.516 0.2027 37 age of volcanism "K=0.428, 0.429%" 10561 1 30.3 1.1 whole rock conventional K-Ar 42. (78MAR27) "4.962E-04, 0.581E-04, 1.1167E-04" 0.601 0.2649 36 age of volcanism K=0.499% 10562 1 32.4 0.8 whole rock conventional K-Ar 43. (78CG29) "4.962E-04, 0.581E-04, 1.1167E-04" 0.548 0.2594 56 age of volcanism "K=0.457, 0.453%" 10562 2 35.3 0.9 whole rock conventional K-Ar 43. (78CG29) "4.962E-04, 0.581E-04, 1.1167E-04" 0.548 0.2801 55 age of volcanism "K=0.457, 0.453%" 10563 1 17.2 1.2 whole rock conventional K-Ar 44. (77104) "4.962E-04, 0.581E-04, 1.1167E-04" 0.394 0.0979 23 age of volcanism K=0.327% 10564 1 0.43 0.09 whole rock conventional K-Ar 1. (H-8-73) "4.962E-04, 0.581E-04, 1.1167E-04" 0.308 0.0019 6 age of volcanism 10565 1 11.71 0.65 whole rock conventional K-Ar 2. (H-8-74) "4.962E-04, 0.581E-04, 1.1167E-04" 1.027 0.1737 72705858 age of volcanism "40AR-RAD=17.157, 17.532, 17.386, AND 17.350XE-12 MOL/GM" 10566 1 11.17 0.65 whole rock conventional K-Ar 3. (H-9-32) "4.962E-04, 0.581E-04, 1.1167E-04" 1.605 0.2588 39 age of volcanism 10567 1 6.85 0.59 whole rock conventional K-Ar 4. (H-8-84) "4.962E-04, 0.581E-04, 1.1167E-04" 0.284 0.0281 26 age of volcanism 10568 1 15.04 0.79 whole rock conventional K-Ar 5. (H-9-75A) "4.962E-04, 0.581E-04, 1.1167E-04" 1.396 0.3036 72 age of volcanism 10569 1 6.07 0.66 whole rock conventional K-Ar 6. (H-9-72) "4.962E-04, 0.581E-04, 1.1167E-04" 0.256 0.0224 15 age of volcanism 10570 1 15.68 0.83 whole rock conventional K-Ar 7. (H-9-71A) "4.962E-04, 0.581E-04, 1.1167E-04" 0.664 0.1506 57 age of volcanism 10571 1 14.62 0.72 whole rock conventional K-Ar 8. (H-9-71C) "4.962E-04, 0.581E-04, 1.1167E-04" 0.785 0.1659 62 age of volcanism 10572 1 8.2 0.8 whole rock conventional K-Ar 1. (103-WB) "4.72E-04, 0.585E-04, 1.19E-04*" 1.028 0.1216 1324 age of volcanism "K=0.853% 40AR-RAD=0.000574, 0.000398 PPM" 10573 1 5.28 0.5 whole rock conventional K-Ar 3. (109-WB) "4.72E-04, 0.585E-04, 1.19E-04*" 1.714 0.1305 96 age of volcanism "K=1.423%; 40AR-RAD=0.000512, 0.000531 PPM" 10574 1 5.87 0.6 plagioclase conventional K-Ar 4. (110-WB) "4.72E-04, 0.585E-04, 1.19E-04*" 0.322 0.0273 814 age of volcanism "K=0.267%; 40AR-RAD=0.000129, 0.000089 PPM" 10575 1 5.04 0.5 plagioclase conventional K-Ar 5. (106-WB) "4.72E-04, 0.585E-04, 1.19E-04*" 1.591 0.1155 916 age of volcanism "K=1.321%; 40AR-RAD=0.000419, 0.000504 PPM" 10576 1 9.16 1 whole rock conventional K-Ar 9. (7F) "4.72E-04, 0.585E-04, 1.19E-04*" 0.387 0.0512 68 age of volcanism "K=0.321%; 40AR-RAD=0.000194, 0.000215 PPM" 10577 1 12.36 0.5 whole rock conventional K-Ar 10. (504) "4.72E-04, 0.585E-04, 1.19E-04*" 4.746 0.8471 3843 age of volcanism "K=3.94%; 40AR-RAD=0.003011, 0.00376 PPM" 10578 1 14.49 0.6 whole rock conventional K-Ar 11. (505) "4.72E-04, 0.585E-04, 1.19E-04*" 4.919 1.03 3937 age of volcanism "K=4.083%; 40AR-RAD=0.004145, 0.004086 PPM" 10579 1 13.52 0.8 whole rock conventional K-Ar 12. (506) "4.72E-04, 0.585E-04, 1.19E-04*" 1.578 0.3084 3634 age of volcanism "K=1.31% 40AR-RAD=0.00118, 0.001285 PPM" 10580 1 2.05 0.8 whole rock conventional K-Ar 13. (507) "4.72E-04, 0.585E-04, 1.19E-04*" 1.129 0.0334 33 age of volcanism "K=0.937%; 40AR-RAD=0.000081, 0.000186 PPM" 10581 1 7.39 0.7 whole rock conventional K-Ar 2. (105-WB) "4.72E-04, 0.585E-04, 1.19E-04*" 0.555 0.0592 78 age of volcanism "K=0.461%; 40AR-RAD=0.000217, 0.000256 PPM" 10582 1 7.29 1.8 whole rock conventional K-Ar 6. (1F) "4.72E-04, 0.585E-04, 1.19E-04*" 0.345 0.0363 45 age of volcanism "K=0.286%; 40AR-RAD=0.000188, 0.000102 PPM" 10583 1 13.6 1.5 whole rock conventional K-Ar 8. (6F) "4.72E-04, 0.585E-04, 1.19E-04*" 0.17 0.0334 1311 age of volcanism "K=0.141%; 40AR-RAD= 0.000143, 0.000124 PPM" 10584 1 11.04 1.2 whole rock conventional K-Ar 7. (5F) "4.72E-04, 0.585E-04, 1.19E-04*" 0.339 0.054 89 age of volcanism "K=0.281%; 40AR-RAD=0.000218, 0.000214 PPM" 10585 1 1.1 0.1 sanidine conventional K-Ar PED-51-60 "4.962E-04, 0.581E-04, 1.1167E-04" 7.2 0.1089 30 age of volcanism K=5.980% 10586 1 4.6 0.6 whole rock conventional K-Ar UAKA-72-65 "4.962E-04, 0.581E-04, 1.1167E-04" 0.551 0.0369 7618 age of volcanism "K=0.457%; 40AR-RAD=3.45, 3.35, AND 4.26XE-12 MOL/GM" 10587 1 24.9 0.6 whole rock conventional K-Ar UAKA-77-80 "4.962E-04, 0.581E-04, 1.1167E-04" 0.86 0.3102 7474 age of volcanism "K=0.714%; 40AR-RAD=30.91, 31.14XE-12 MOL/GM" 10588 1 9.6 0.2 whole rock conventional K-Ar UAKA-77-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.407 0.5635 5655 age of volcanism "K=0.338%; 40AR-RAD=5.69, 5.58XE-12 MOL/GM" 10589 1 18.9 0.7 whole rock conventional K-Ar UAKA-77-82 "4.962E-04, 0.581E-04, 1.1167E-04" 0.373 0.1021 243731 age of volcanism "K=0.310%; 40AR-RAD=9.98, 10.23, AND 10.43XE-12 MOL/GM" 10590 1 22.1 0.6 whole rock conventional K-Ar UAKA-77-83 "4.962E-04, 0.581E-04, 1.1167E-04" 0.311 0.0995 6564 age of volcanism "K=0.258%; 40AR-RAD=9.74, 10.16XE-12 MOL/GM" 10591 1 24.6 0.7 whole rock conventional K-Ar UAKA-77-84 "4.962E-04, 0.581E-04, 1.1167E-04" 0.281 0.1001 484844 age of volcanism "K=0.233%; 40AR-RAD=10.10, 9.99, AND 9.94XE-12 MOL/GM" 10592 1 3.2 0.1 whole rock conventional K-Ar UAKA-77-85 "4.962E-04, 0.581E-04, 1.1167E-04" 1.437 0.0652 4747 age of volcanism "K=1.193%; 40AR-RAD=6.54, 6.50XE-12 MOL/GM" 10593 1 4.4 0.1 whole rock conventional K-Ar UAKA-77-86 "4.962E-04, 0.581E-04, 1.1167E-04" 1.396 0.0884 4648 age of volcanism "K=1.159%; 40AR-RAD=9.03, 8.66XE-12 MOL/GM" 10594 1 9.7 0.3 whole rock conventional K-Ar UAKA-77-87 "4.962E-04, 0.581E-04, 1.1167E-04" 0.605 0.0843 252125 age of volcanism "K=0.502%; 40AR-RAD=8.48, 8.47, AND 8.34XE-12 MOL/GM" 10595 1 19.6 0.6 plagioclase conventional K-Ar UAKA-77-88 "4.962E-04, 0.581E-04, 1.1167E-04" 1.253 0.3557 5959 age of volcanism "K=1.04%; 40AR-RAD=36.81, 34.33XE-12 MOL/GM" 10595 2 19.5 0.5 biotite conventional K-Ar UAKA-77-88 "4.962E-04, 0.581E-04, 1.1167E-04" 8.08 2.2745 7172 age of volcanism "K=6.707%; 40AR-RAD=228.7, 226.2XE-12 MOL/GM" 10596 1 25.1 0.7 whole rock conventional K-Ar UAKA-77-89 "4.962E-04, 0.581E-04, 1.1167E-04" 0.548 0.1997 4746 age of volcanism "K=0.455%; 40AR-RAD=20.22, 19.73XE-12 MOL/GM" 10597 1 30.2 0.7 biotite conventional K-Ar UAKA-77-90 "4.962E-04, 0.581E-04, 1.1167E-04" 8.156 3.5795 9191 age of volcanism "K=6.77%; 40AR-RAD=361.8, 354.1XE-12 MOL/GM" 10598 1 25.8 0.9 hornblende conventional K-Ar UAKA-77-91 "4.962E-04, 0.581E-04, 1.1167E-04" 0.311 0.1163 727168 age of volcanism "K=0.258%; 40AR-RAD=11.65, 11.99, AND 11.24XE-12 MOL/GM" 10598 2 25.9 0.6 whole rock conventional K-Ar UAKA-77-91 "4.962E-04, 0.581E-04, 1.1167E-04" 6.42 2.412 9596 age of volcanism "K=5.33%; 40AR-RAD=238.5, 243.9XE-12 MOL/GM" 10599 1 29.3 0.6 whole rock conventional K-Ar UAKA-77-92 "4.962E-04, 0.581E-04, 1.1167E-04" 4.042 1.7157 909093 age of volcanism "K=3.355%; 40AR-RAD=168.4, 176.5, AND 169.8XE-12 MOL/GM" 10600 1 4.8 0.1 whole rock conventional K-Ar UAKA-77-93 "4.962E-04, 0.581E-04, 1.1167E-04" 0.841 0.0584 3938 age of volcanism "K=0.698%; 40AR-RAD=5.92, 5.76XE-12 MOL/GM" 10624 1 4.79 0.23 glass conventional K-Ar 78-115A "4.962E-04, 0.581E-04, 1.1167E-04" 4.25 0.301 65 POTASSIUM DETERMINED BY ISOTOPE DILUTION ROCK IS PROBABLY 5.42 M.Y. OLD 10624 2 5.42 0.27 sanidine conventional K-Ar 78-115B "4.962E-04, 0.581E-04, 1.1167E-04" 2.11 0.164 52 age of volcanism "K20=2.09, 2.13%" 10625 1 7.81 0.45 whole rock conventional K-Ar 78-164 "4.962E-04, 0.581E-04, 1.1167E-04" 1.86 0.21 38 age of volcanism "K20=1.85, 1.87%" 10626 1 7.55 0.44 glass conventional K-Ar 78-175D "4.962E-04, 0.581E-04, 1.1167E-04" 4.965 0.541 37 age of volcanism "K20=4.96, 4.97%" 10626 2 7.63 0.63 sanidine conventional K-Ar 78-175D "4.962E-04, 0.581E-04, 1.1167E-04" 2.95 0.325 26 age of volcanism 10627 1 71.7 2 muscovite conventional K-Ar 1. (415) "4.962E-04, 0.581E-04, 1.1167E-04" 10.52 11.08 70 minimum age of intrusion 10627 2 15.4 0.5 biotite conventional K-Ar 1. (415) "4.962E-04, 0.581E-04, 1.1167E-04" 6.1 1.36 11 A REDUCED AGE 10645 1 392 3 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.182 1.1483 56 age of intrusion 10649 1 18.5 0.8 muscovite conventional K-Ar 1. (446) "4.962E-04, 0.581E-04, 1.1167E-04" 10.93 2.921 56 DATE MAY INDICATE TIME OF MOST RECENT MOVEMENT ON OVERLYING THRUST FAULT OR TIME OF COOLING DURING UPLIFT. 10652 1 362 5 hornblende 39Ar-40Ar incremental (plateau) 3 "4.962E-04, 0.581E-04, 1.1167E-04" 96 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10652 2 363 5 biotite 39Ar-40Ar incremental (plateau) 3 "4.962E-04, 0.581E-04, 1.1167E-04" 97 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10653 1 362 5 hornblende 39Ar-40Ar incremental (plateau) 4A "4.962E-04, 0.581E-04, 1.1167E-04" 88 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10653 2 357 5 biotite 39Ar-40Ar incremental (plateau) 4A "4.962E-04, 0.581E-04, 1.1167E-04" 97 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10655 1 363 5 biotite 39Ar-40Ar incremental (plateau) 5A "4.962E-04, 0.581E-04, 1.1167E-04" 97 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10658 1 365 5 biotite 39Ar-40Ar incremental (plateau) 7A "4.962E-04, 0.581E-04, 1.1167E-04" 97 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10659 1 367 5 biotite 39Ar-40Ar incremental (plateau) 7B "4.962E-04, 0.581E-04, 1.1167E-04" 98 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA 10717 1 20 2 whole rock conventional K-Ar "69,486" "4.962E-04, 0.581E-04, 1.1167E-04" 2.195 0.6675 36 age of volcanism K=1.82% 10718 1 18.87 1.3 plagioclase conventional K-Ar 800 no decay constants given* 0.35 0.0956 25 age of volcanism K=0.29% 10718 2 19.1 1.2 hornblende conventional K-Ar 801 no decay constants given* 0.63 0.1742 37 age of volcanism K=0.52% 10737 1 11.8 0.8 plagioclase conventional K-Ar S1 "4.72E-04, 0.585E-04, 1.19E-04" 0.0377 13 age of volcanism 10738 1 4.7 0.2 plagioclase conventional K-Ar S2 "4.72E-04, 0.585E-04, 1.19E-04" 0.0636 24 age of volcanism 10739 1 4.2 0.1 plagioclase conventional K-Ar S5 "4.72E-04, 0.585E-04, 1.19E-04" 0.0582 32 age of volcanism 10740 1 5.3 0.2 whole rock conventional K-Ar S8 "4.72E-04, 0.585E-04, 1.19E-04" 0.2924 50 age of volcanism 10741 1 4 1.2 plagioclase conventional K-Ar S14 "4.72E-04, 0.585E-04, 1.19E-04" 0.0035 2 CALCIC PLAGIOCLASE AGE IS TOO YOUNG FOR THE STRATIGRAPHIC POSITION OF THIS SAMPLE. 10742 1 1.4 0.8 plagioclase conventional K-Ar S17 "4.72E-04, 0.585E-04, 1.19E-04" 0.0013 1 CALCIC PLAGIOCLASE AGE IS TOO YOUNG FOR THE STRATIGRAPHIC POSITION OF THIS SAMPLE. 10743 1 8.9 4.5 plagioclase conventional K-Ar S20 "4.72E-04, 0.585E-04, 1.19E-04" 0.0057 2 age of volcanism CALCIC PLAGIOCLASE 10744 1 2.9 0.2 plagioclase conventional K-Ar S30 "4.72E-04, 0.585E-04, 1.19E-04" 0.0707 15 age of volcanism 10745 1 133.4 4 hornblende conventional K-Ar 1. 79WG215 "4.962E-04, 0.581E-04, 1.1167E-04" 0.15 0.299 12 age of volcanism 10746 1 122.8 6 pyroxenes conventional K-Ar 2. 79WG134B "4.962E-04, 0.581E-04, 1.1167E-04" 0.063 0.1153 14 age of volcanism 10747 1 159.5 3 hornblende conventional K-Ar 3. 79WG221 "4.962E-04, 0.581E-04, 1.1167E-04" 0.159 0.3818 26 age of intrusion 10748 1 76.8 1.5 hornblende conventional K-Ar 4. 79WG044 "4.962E-04, 0.581E-04, 1.1167E-04" 0.33 0.3728 28 THIS AGE MAY BE THE TIME OF HYDROTHERMAL ACTIVITY 10777 1 39.39 1.3 biotite conventional K-Ar 1. (PED-9-63) "4.76E-04, 0.589E-04, 1.18E-04*" 7.78 4.46 71 age of volcanism K=6.46% 10778 1 37.58 1.1 sanidine conventional K-Ar 2. (PED-13-62) "4.76E-04, 0.589E-04, 1.18E-04*" 9.95 5.44 83 age of volcanism K=8.26% 10778 2 33.58 2.7 biotite conventional K-Ar 2. PED-13-62 "4.76E-04, 0.589E-04, 1.18E-04*" 8.73 4.26 37 K=7.25% AGE IS LOW IN COMPARISON TO SANIDINE AGE OF 36.7 M.Y. 10779 1 28.65 2.6 plagioclase conventional K-Ar 4. (PED-16-63) "4.76E-04, 0.589E-04, 1.18E-04*" 0.837 0.348 35 age of volcanism K=0.695% 10780 1 28.48 1.9 biotite conventional K-Ar 5. (MB-2-62) "4.76E-04, 0.589E-04, 1.18E-04*" 7.84 3.24 42 age of volcanism K=6.505% 10781 1 28.5 1.4 biotite conventional K-Ar 6. (PED-1-63) "4.76E-04, 0.589E-04, 1.18E-04*" 7.06 2.92 50 age of volcanism K=5.86% 10782 1 30.49 0.9 sanidine conventional K-Ar 7. (PED-17-62) "4.76E-04, 0.589E-04, 1.18E-04*" 6.46 2.86 92 age of volcanism K=5.36% 10783 1 26.4 0.9 sanidine conventional K-Ar 7. (PED-76-63) "4.76E-04, 0.589E-04, 1.18E-04*" 6.4 2.45 74 maximum age of volcanism K=5.315% 10784 1 28.55 2.6 biotite conventional K-Ar 8. (RM-1-64) "4.76E-04, 0.589E-04, 1.18E-04*" 7.24 3 34 age of volcanism K=6.01% 10785 1 28.08 0.9 biotite conventional K-Ar 9. (PED-2-62) "4.76E-04, 0.589E-04, 1.18E-04*" 8 3.26 76 age of intrusion K=6.64% 10786 1 27.64 1.2 whole rock conventional K-Ar 10. (PED-17-63) "4.76E-04, 0.589E-04, 1.18E-04*" 1.885 0.756 56 age of volcanism K=1.565% 10787 1 27.12 1.2 biotite conventional K-Ar PED-9-62 "4.76E-04, 0.589E-04, 1.18E-04*" 6 2.36 56 age of volcanism BIOTITE WITH HORNBLENDE K=4.98% 10788 1 27.12 0.9 sanidine conventional K-Ar 12. (JGW-1-59) "4.76E-04, 0.589E-04, 1.18E-04*" 6.66 2.62 74 age of volcanism K=5.53% 10789 1 26.57 1.2 biotite conventional K-Ar 13. (5A-2) "4.76E-04, 0.589E-04, 1.18E-04*" 8.07 3.11 56 age of intrusion K=6.70% 10790 1 25.83 5.1 biotite conventional K-Ar 14. (PED-10-62) "4.76E-04, 0.589E-04, 1.18E-04*" 5.9 2.21 20 age of volcanism K=4.90% 10791 1 25.16 1.4 biotite conventional K-Ar 15. (PED-10-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.39 3.06 48 age of volcanism K=6.965% 10792 1 25.63 1 biotite conventional K-Ar 16. (RM-4-63) "4.76E-04, 0.589E-04, 1.18E-04*" 7.83 2.91 61 age of volcanism K=6.50% 10793 1 25.1 0.9 biotite conventional K-Ar 17. (PED-1-64) "4.76E-04, 0.589E-04, 1.18E-04*" 8.52 3.1 67 age of intrusion K=7.075% 10794 1 22.34 3 biotite conventional K-Ar 18. (CMB-1-62) "4.76E-04, 0.589E-04, 1.18E-04*" 7.85 2.54 43 age of intrusion K=6.52% 10795 1 20.39 0.9 biotite conventional K-Ar 19A. (PED-4-62) "4.76E-04, 0.589E-04, 1.18E-04*" 8.23 2.43 54 age of volcanism K=6.83% "SAMPLE NO. 53 OF EBERLY AND STANLEY, 1978, IS SAME SAMPLE AS ABOVE" 10796 1 20.27 3 whole rock conventional K-Ar 20. (PED-8-63) "4.76E-04, 0.589E-04, 1.18E-04*" 3.22 0.945 25 age of volcanism K=2.67% 10797 1 16.56 0.7 sanidine conventional K-Ar 21. (PED-12-62) "4.76E-04, 0.589E-04, 1.18E-04*" 6.93 1.66 59 age of volcanism K=5.75% 10798 1 14.26 0.5 K feldspar conventional K-Ar 22. (MB-3-64) "4.76E-04, 0.589E-04, 1.18E-04*" 6.26 1.29 87 age of volcanism K=5.20% 10799 1 whole rock conventional K-Ar PED-46-66 "4.76E-04, 0.589E-04, 1.18E-04" 1.77 age of intrusion "AGE IS ABOUT 0.01 M.Y.; K=1.47, 1.47%" 10799 2 118.49 3 olivine conventional K-Ar PED-46-66 "4.76E-04, 0.589E-04, 1.18E-04*" 0.019 0.0335 67 "K=0.016, 0.016%" SPURIOUS AGE; EXCESS ARGON-40 PRESENT 10800 1 1.1 0.2 whole rock conventional K-Ar PED-5-65 "4.76E-04, 0.589E-04, 1.18E-04*" 1.14 0.0181 312 age of volcanism "K=0.947, 0.948%; 40AR-RAD=1.95, 1.25, AND 2.24XE-12 MOL/GM; ANALYTICAL DATA FROM DAMON AND OTHERS, 1966" 10801 1 2.4 0.3 whole rock conventional K-Ar PED-6-65 "4.76E-04, 0.589E-04, 1.18E-04" 81512 age of volcanism JUST THE GROUNDMASS ANALYZED "K VARIES FROM 0.833 TO 0.871%; 40AR-RAD=2.67, 4.30, AND 3.37XE-12 MOL/GM" 10801 2 9.3 0.8 plagioclase conventional K-Ar PED-6-65 "4.76E-04, 0.589E-04, 1.18E-04" PLAGIOCLASE PHENOCRYSTS SEE ARTICLE FOR ANALYTICAL DATA "SPURIOUS AGE, EXCESS AR-40 PRESENT" 10802 1 6.4 1.2 whole rock conventional K-Ar PED-15-64 "4.76E-04, 0.589E-04, 1.18E-04*" 1.07 0.0988 20 age of volcanism "K=0.89, 0.89%" 10803 1 2.65 0.9 whole rock conventional K-Ar PED-8-64 "4.76E-04, 0.589E-04, 1.18E-04*" 1.51 0.0576 6 age of volcanism "K=1.25, 1.25%" 10804 1 3.78 0.7 whole rock conventional K-Ar PED-6-66 "4.76E-04, 0.589E-04, 1.18E-04*" 2.02 0.11 12 age of intrusion MATERIAL FROM DIKE INTERIOR "K=1.68, 1.68%" 10804 2 4.44 0.1 plagioclase conventional K-Ar PED-6-66 "4.76E-04, 0.589E-04, 1.18E-04*" 1.28 0.082 93 HF LEACHED PLAGIOCLASE PHENOCRYSTS FROM DIKE INTERIOR "K=1.06, 1.06%" AGE TOO OLD; EXCESS ARGON PRESENT 10804 3 5.32 0.3 hornblende conventional K-Ar PED-6-66 "4.76E-04, 0.589E-04, 1.18E-04*" 1.98 0.152 27 HORNBLENDE PHENOCRYSTS FROM DIKE INTERIOR "K=1.64, 1.64%" "SPURIOUS AGE, EXCESS AR-40 PRESENT" 10804 4 9.52 1.1 whole rock conventional K-Ar PED-6-66 "4.76E-04, 0.589E-04, 1.18E-04*" 1.23 0.169 30 CHILLED BORDER OF DIKE "K=1.02, 1.02%" SPURIOUS AGE; EXCESS AR-40 PRESENT 10805 1 10.65 1.1 whole rock conventional K-Ar PED-11-64 "4.76E-04, 0.589E-04, 1.18E-04*" 1.32 0.203 25 age of volcanism "K=1.09, 1.10%" 10806 1 22.14 1.3 whole rock conventional K-Ar RLE-31-68 "4.76E-04, 0.589E-04, 1.18E-04*" 1.06 0.34 30 age of volcanism K=0.88% 10807 1 18.04 0.8 whole rock conventional K-Ar RLE-27-67 "4.76E-04, 0.589E-04, 1.18E-04*" 1.019 0.266 38 age of volcanism K=0.846% 10808 1 21.17 0.6 whole rock conventional K-Ar RLE-29-67 "4.76E-04, 0.589E-04, 1.18E-04*" 4.3 1.318 61 age of volcanism K=3.57% 10809 1 20.3 1.2 whole rock conventional K-Ar RLE-27-68 "4.76E-04, 0.589E-04, 1.18E-04*" 3.64 1.07 31 age of volcanism K=3.64% 10810 1 15.64 4.8 whole rock conventional K-Ar RLE-20-68 "4.76E-04, 0.589E-04, 1.18E-04*" 4.2 0.95 7 age of volcanism K=3.49% 10811 1 8.53 0.5 whole rock conventional K-Ar SR-61A "4.72E-04, 0.585E-04, 1.19E-04*" 1.891 0.2327 age of volcanism K=1.570% 10812 1 19.3 1.3 whole rock conventional K-Ar J-1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.791 0.5004 age of volcanism K=1.487% 10813 1 24.29 5.2 whole rock conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.42 0.5 9 age of volcanism K=1.18% 10814 1 163.65 8 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 3.71 9.15 79 K=3.08% "SPURIOUS AGE, TUFF IS PROBABLY MIOCENE IN AGE" 10815 1 17.81 1 whole rock conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 2.37 43 age of volcanism K=7.64% 10816 1 25.76 1.4 whole rock conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 4.07 1.52 52 K=3.38% A COOLING AGE 10817 1 30.14 2.4 whole rock conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 8.25 3.61 28 age of volcanism K=6.85% 10818 1 23.89 0.6 whole rock conventional K-Ar 24. VAKA-72-66 "4.76E-04, 0.589E-04, 1.18E-04*" 3.16 1.0939 79 age of volcanism A TUFF K=2.62% 10819 1 16.53 0.6 whole rock conventional K-Ar 24. VAKA-72-70 "4.76E-04, 0.589E-04, 1.18E-04*" 3.18 0.7603 57 age of intrusion K=2.64% 10820 1 18.57 2 whole rock conventional K-Ar 24. VAKA-72-78 "4.72E-04, 0.585E-04, 1.19E-04*" 2.94 0.79 18 age of intrusion PUBLISHED SAMPLE NUMBER MAY BE WRONG--COMPILER K=2.44% 10821 1 47.71 0.6 whole rock conventional K-Ar 24. VAKA-72-78 "4.76E-04, 0.589E-04, 1.18E-04*" 3.49 2.429 76 K=2.90% A COOLING AGE 10822 1 20.41 2.6 whole rock conventional K-Ar 58 "4.72E-04, 0.585E-04, 1.19E-04*" 0.88 0.26 16 age of volcanism K=0.73% 10823 1 10.56 4.5 whole rock conventional K-Ar 59 "4.72E-04, 0.585E-04, 1.19E-04*" 0.59 0.09 2 age of volcanism K=0.49% 10824 1 52.65 3.3 biotite conventional K-Ar 60 "4.72E-04, 0.585E-04, 1.19E-04*" 1.43 1.1 42 IMPURE BIOTITE K=1.19% THIS AGE PROBABLY TOO OLD; ROCK PROBABLY OLIGOCENE OR MIOCENE. 10825 1 23.56 7.7 whole rock conventional K-Ar 60 "4.72E-04, 0.585E-04, 1.19E-04*" 1.23 0.42 6 age of volcanism K=1.02% 10826 1 22.33 1.9 biotite conventional K-Ar 61 "4.72E-04, 0.585E-04, 1.19E-04*" 1.02 0.33 26 age of volcanism IMPURE BIOTITE K=0.85% 10827 1 44 5 biotite conventional K-Ar 61 "4.72E-04, 0.585E-04, 1.19E-04" 4.84 10 K=4.02%; ARGON VALUE NOT GIVEN AGE PROBABLY TOO OLD; ROCK PROBABLY OLIGOCENE OR MIOCENE 10828 1 22.83 1.2 whole rock conventional K-Ar 62 "4.72E-04, 0.585E-04, 1.19E-04*" 7.95 2.63 63 age of volcanism K=6.60% 10829 1 21.13 1.3 whole rock conventional K-Ar 63 "4.72E-04, 0.585E-04, 1.19E-04*" 2.19 0.67 43 age of volcanism K=1.82% 10830 1 16.46 2.1 whole rock conventional K-Ar 64 "4.72E-04, 0.585E-04, 1.19E-04*" 0.42 0.1 16 age of volcanism K=0.35% 10831 1 21.7 whole rock conventional K-Ar 84 "4.72E-04, 0.585E-04, 1.19E-04*" 0.54 0.17 14 age of volcanism K=0.45% 10832 1 21.25 3.6 whole rock conventional K-Ar 85 "4.72E-04, 0.585E-04, 1.19E-04*" 0.52 0.16 12 age of volcanism K=0.43% 10833 1 13.76 2.1 whole rock conventional K-Ar 86 "4.72E-04, 0.585E-04, 1.19E-04*" 1.81 0.36 14 age of volcanism K=1.50% 10834 1 49.07 2.8 biotite conventional K-Ar 87 "4.72E-04, 0.585E-04, 1.19E-04*" 2.29 1.64 54 IMPURE BIOTITE K=1.90% THIS AGE IS PROBABLY TOO OLD; ROCK IS PROBABLY UPPER OLIGOCENE OR LOWER MIOCENE. 10835 1 21.25 3.1 whole rock conventional K-Ar 89 "4.72E-04, 0.585E-04, 1.19E-04*" 1.69 0.52 13 age of volcanism K=1.40% 10836 1 21.44 1.2 biotite conventional K-Ar 90 "4.72E-04, 0.585E-04, 1.19E-04*" 9.05 2.81 59 age of volcanism K=7.51% 10837 1 24.55 1.6 biotite conventional K-Ar 91 "4.72E-04, 0.585E-04, 1.19E-04*" 7.84 2.79 41 age of volcanism K=6.51% 10838 1 606.43 biotite conventional K-Ar 94 "4.72E-04, 0.585E-04, 1.19E-04*" 4.24 44 69 age of intrusion K=3.52% 10839 1 73.81 13.2 biotite conventional K-Ar 96 "4.72E-04, 0.585E-04, 1.19E-04*" 2.95 3.2 11 IMPURE BIOTITE K=2.45% THIS AGE IS PROBABLY TOO OLD; ROCK IS PROBABLY MIOCENE. 10840 1 5.94 1.8 whole rock conventional K-Ar 97 "4.72E-04, 0.585E-04, 1.19E-04*" 0.7 0.06 6 age of volcanism K=0.58% 10841 1 996.85 39 biotite conventional K-Ar 98 "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 161.71 99 minimum age of intrusion K=7.01% 10842 1 27.78 3.8 whole rock conventional K-Ar 99 "4.72E-04, 0.585E-04, 1.19E-04*" 5.78 2.33 15 age of volcanism K=4.80% 10843 1 18.3 7.2 whole rock conventional K-Ar 100 "4.72E-04, 0.585E-04, 1.19E-04*" 0.87 0.23 5 age of volcanism K=0.72% 10844 1 23.95 1.6 biotite conventional K-Ar 101 "4.72E-04, 0.585E-04, 1.19E-04*" 9.71 3.37 37 age of volcanism K=8.06% 10845 1 29.11 4.2 biotite conventional K-Ar 102 "4.72E-04, 0.585E-04, 1.19E-04*" 1.42 0.6 14 age of volcanism IMPURE BIOTITE K=1.18% 10846 1 167.11 4 whole rock conventional K-Ar 103. VAKA-72-57 "4.76E-04, 0.589E-04, 1.18E-04*" 4.45 11.218 94 K=3.69% ROCK EFFECTED BY THERMAL EVENT DURING THE JURASSIC 10847 1 20.93 1 whole rock conventional K-Ar 103. VAKA-72-54 "4.76E-04, 0.589E-04, 1.18E-04*" 2.93 0.888 82 age of volcanism K=2.43% 10848 1 21.86 0.9 whole rock conventional K-Ar 103. VAKA-72-58 "4.76E-04, 0.589E-04, 1.18E-04*" 4.67 1.479 92 age of intrusion K=3.88% 10849 1 18.46 1.5 whole rock conventional K-Ar 104. VAKA-72-48 "4.76E-04, 0.589E-04, 1.18E-04*" 9.07 2.4232 17 minimum age of volcanism K=7.53% 10850 1 30.02 3.1 whole rock conventional K-Ar 105. VAKA-72-47 "4.76E-04, 0.589E-04, 1.18E-04*" 2.31 1.0067 4 age of volcanism K=1.92% 10851 1 2.6 0.9 whole rock conventional K-Ar 106 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8 0.03 6 age of volcanism K=0.66% 10852 1 21.68 1.2 whole rock conventional K-Ar 107 "4.72E-04, 0.585E-04, 1.19E-04*" 2.42 0.76 63 age of volcanism K=2.01% 10853 1 25.24 2.7 whole rock conventional K-Ar 108 "4.72E-04, 0.585E-04, 1.19E-04*" 3.47 1.27 20 age of volcanism K=2.88% 10854 1 15.59 2.2 whole rock conventional K-Ar 109 "4.72E-04, 0.585E-04, 1.19E-04*" 1.02 0.23 15 age of volcanism K=0.85% 10855 1 23.84 2.7 whole rock conventional K-Ar 110 "4.72E-04, 0.585E-04, 1.19E-04*" 4.63 1.6 18 age of volcanism K=3.84% 10856 1 79.54 4.3 biotite conventional K-Ar 112 "4.72E-04, 0.585E-04, 1.19E-04*" 2.81 3.29 62 IMPURE BIOTITE K=2.33% AGE IS TOO OLD BECAUSE OF DETRITAL METAMORPHIC BIOTITE; ROCK IS PROBABLY MIOCENE. 10857 1 325.43 15.7 biotite conventional K-Ar 113 "4.72E-04, 0.585E-04, 1.19E-04*" 7.81 40.1 74 K=6.48% "A REDUCED AGE, ROCK PROBABLY PRECAMBRIAN" 10858 1 202.55 9.4 biotite conventional K-Ar 113 "4.72E-04, 0.585E-04, 1.19E-04*" 7.89 24.35 93 K=6.55% A REDUCED AGE; ROCK IS PROBABLY PRECAMBRIAN 10859 1 15.37 31.9 whole rock conventional K-Ar 115 "4.72E-04, 0.585E-04, 1.19E-04*" 0.18 0.04 1 age not evaluated K=0.15%; VERY LARGE ANALYTICAL ERROR 10860 1 16 10 whole rock conventional K-Ar 115 "4.72E-04, 0.585E-04, 1.19E-04*" 1.33 0.3 3 age of intrusion K=1.10%; LARGE ANALYTICAL ERROR 10861 1 39.75 2 biotite conventional K-Ar 116 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 4.78 66 K=6.86% A REDUCED AGE 10862 1 60.63 3.2 biotite conventional K-Ar 116 "4.72E-04, 0.585E-04, 1.19E-04*" 6.06 5.38 60 K=5.03% A REDUCED AGE; ROCK IS PROBABLY PRECAMBRIAN 10863 1 26.03 1.7 whole rock conventional K-Ar 120 "4.72E-04, 0.585E-04, 1.19E-04*" 6.65 2.51 42 age of volcanism K=5.52% 10864 1 9.62 1.8 whole rock conventional K-Ar 121 "4.72E-04, 0.585E-04, 1.19E-04*" 0.72 0.1 10 age of volcanism K=0.60% 10865 1 16.89 1 whole rock conventional K-Ar 123 "4.72E-04, 0.585E-04, 1.19E-04*" 3.52 0.86 46 age of volcanism K=2.92% 10866 1 8.7 whole rock conventional K-Ar 124 "4.72E-04, 0.585E-04, 1.19E-04*" 0.64 0.08 3 age of volcanism K=0.53% 10867 1 31.48 1.2 plagioclase conventional K-Ar 26. (RM-2-64A) "4.76E-04, 0.589E-04, 1.18E-04*" 0.84 0.384 44 age of volcanism "K=0.70%; ANALYTICAL DATA FROM DAMON, 1968, AEC REPORT C00-689-60, P. 44" 10868 1 13.24 0.8 whole rock conventional K-Ar 73. (PED-9-67) "4.76E-04, 0.589E-04, 1.18E-04*" 0.763 0.146 30 age of volcanism "K=0.633%; ANALYTICAL DATA FROM DAMON, 1968, AEC REPORT C00-689-100, P. 50" 10869 1 22.45 0.9 biotite conventional K-Ar 111. (PED-23-67) "4.76E-04, 0.589E-04, 1.18E-04*" 8.3 2.7 43 age of volcanism "K=6.89%; ANALYTICAL DATA FROM DAMON, 1968, AEC REPORT C00-689-100, P. 43" 10870 1 25.35 2.1 hornblende conventional K-Ar 119. (PED-1-67) "4.76E-04, 0.589E-04, 1.18E-04*" 0.887 0.326 22 age of volcanism "K=0.736%; ANALYTICAL DATA FROM DAMON, 1968, AEC REPORT C00-689-100,. P. 44" 10871 1 13.02 2.2 whole rock conventional K-Ar 71. (PED-28-66) "4.76E-04, 0.589E-04, 1.18E-04*" 1.86 0.35 11 age of volcanism "K=1.54%; ANALYTICAL DATA FROM DAMON, 1968, AEC REPORT C00-689-100, P. 50" 10872 1 23.82 0.9 whole rock conventional K-Ar 29. (JKP-2-68) "4.76E-04, 0.589E-04, 1.18E-04*" 2.29 0.7905 46 age of volcanism "K=1.90%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 50" 10873 1 4.73 0.4 glass conventional K-Ar 47. (LDA-1-66) "4.76E-04, 0.589E-04, 1.18E-04*" 4.4 0.3 23 minimum age of volcanism "K=3.65%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 48" 10874 1 23.11 1 biotite conventional K-Ar 54. (PED-18-68) "4.76E-04, 0.589E-04, 1.18E-04*" 8.93 2.99 183452 age of volcanism "K=7.41%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 49" 10875 1 20.6 1.2 biotite conventional K-Ar 55. (PED-16-68) "4.76E-04, 0.589E-04, 1.18E-04*" 8.65 2.58 69 age of volcanism "K=7.18%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 49" 10876 1 18.21 3.1 whole rock conventional K-Ar 56. (PED-14-68) "4.76E-04, 0.589E-04, 1.18E-04*" 1.86 0.49 11 age of volcanism "K=1.54%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 49" 10877 1 21.85 0.8 biotite conventional K-Ar 57. (PED-17-68) "4.76E-04, 0.589E-04, 1.18E-04*" 8.91 2.82 2151 age of volcanism "K=7.40%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 49" 10878 1 63.8 5.5 biotite conventional K-Ar 95. (PED-3-68) "4.76E-04, 0.589E-04, 1.18E-04" 7.51 7.018 22 age of intrusion "K=6.23%; ANALYTICAL DATA FROM DAMON, 1969, AEC REPORT C00-689-120, P. 48" 10879 1 26.89 2.4 plagioclase conventional K-Ar 40. (PED-3-69) "4.76E-04, 0.589E-04, 1.18E-04*" 1.41 0.55 20 age of volcanism "K=1.17%; ANALYTICAL DATA FROM DAMON, 1970, AEC REPORT C00-689-130, P. 40" 10880 1 16.79 0.7 whole rock conventional K-Ar 88. (PED-7-68) "4.76E-04, 0.589E-04, 1.18E-04*" 2.01 0.488 48 age of volcanism "K=1.67%; ANALYTICAL DATA FROM DAMON, 1970, AEC REPORT C00-689-130, P. 40" 10880 2 15.48 4.4 whole rock conventional K-Ar 88. (PED-7-68) "4.76E-04, 0.589E-04, 1.18E-04*" 2.01 0.45 7 "K=1.67%; THIS ANALYTICAL DATA AND AGE ARE FROM DAMON, 1970, AEC REPORT C00-689-130, P. 40" AGE APPEARS TOO YOUNG. 10881 1 25.75 1.6 whole rock conventional K-Ar 118. (PED-9-68) "4.76E-04, 0.589E-04, 1.18E-04*" 1.837 0.686 28 age of volcanism "K=1.525%; ANALYTICAL DATA FROM DAMON, 1970, AEC REPORT C00-689-130, P. 40" 10882 1 8.35 glass conventional K-Ar 122. (PED-4-69) "4.76E-04, 0.589E-04, 1.18E-04*" 2.48 0.299 29 minimum age of volcanism GLASS NOT DEVITRIFIED "K=2.06%; DAMON, 1970, AEC REPORT C00-689-130, P. 40, CALCULATED AN AGE OF 8.1+/-0.5 M.Y. FOR THIS SAMPLE IN CONTRAST TO 5.4 MA REPORTED IN THIS PAPER. ANALYTICAL DATA FROM SAME SOURCE." 10883 1 29.88 0.9 biotite conventional K-Ar 35. (PED-7-65) "4.76E-04, 0.589E-04, 1.18E-04*" 8.91 3.865 6073 age of volcanism "K=7.41, 7.39%, 40AR-RAD=3.89 AND 3.84 X E-10 MOL/GM; ANALYTICAL DATA FROM DAMON, 1966, AEC REPORT C00-689-60, P. 26" 10884 1 18.38 0.5 biotite conventional K-Ar 52. (PED-11-65) "4.76E-04, 0.589E-04, 1.18E-04*" 8.63 2.295 6878 age of volcanism "K=7.16%; 40AR-RAD=2.29 AND 2.30 X E-10 MOL/GM; ANALYTICAL DATA FROM DAMON, 1966, AEC REPORT C00-689-60, P. 26" 10884 2 18.72 2.5 plagioclase conventional K-Ar 52. (PED-11-65) "4.76E-04, 0.589E-04, 1.18E-04*" 0.62 0.168 14 age of volcanism "K=0.515, 0.516%; ANALYTICAL DATA FROM DAMON, 1966, AEC REPORT C00-689-60, P. 26" 10885 1 26.93 1.6 biotite conventional K-Ar 117. (PED-4-65) "4.76E-04, 0.589E-04, 1.18E-04*" 7.73 3.02 48 age of volcanism "K=6.42%; ANALYTICAL DATA FROM DAMON, 1965, AEC REPORT C00-689-50, P. 43" 10886 1 14 7 biotite conventional K-Ar 69. (BES-58-282) "4.76E-04, 0.589E-04, 1.18E-04" age of volcanism NO ANALYTICAL DATA GIVEN 10887 1 1380.53 biotite conventional K-Ar DEL-13-62 "4.76E-04, 0.589E-04, 1.18E-04*" 8.32 248.4 97 minimum age of intrusion "K=6.93, 6.88%" 10887 2 945.18 orthoclase conventional K-Ar DEL-13-62 "4.76E-04, 0.589E-04, 1.18E-04*" 14.19 253.8 100 48-80 MESH "K=11.79, 11.76%" "SPURIOUS AGE, TOO YOUNG" 10887 3 1425.03 plagioclase conventional K-Ar DEL-13-62 "4.76E-04, 0.589E-04, 1.18E-04*" 1 31.25 96 age of intrusion "35-42 MESH, ABOUT 50% OF SAMPLE WAS QUARTZ" "K=0.82, 0.84%" 10888 1 1413.93 biotite conventional K-Ar DEL-3-62 "4.76E-04, 0.589E-04, 1.18E-04*" 8.01 247.5 98 age of intrusion "K=6.68, 6.62%" 10888 2 921.4 orthoclase conventional K-Ar DEL-3-62 "4.76E-04, 0.589E-04, 1.18E-04*" 12.2 211.2 91 35-42 MESH "K=10.12, 10.13%" "SPURIOUS AGE, TOO YOUNG" 10888 3 1430.74 plagioclase conventional K-Ar DEL-3-62 "4.76E-04, 0.589E-04, 1.18E-04*" 1.02 32.06 92 age of intrusion "35-42 MESH, 3% QUARTZ IMPURITY" "K=0.828, 0.858%" 10889 1 59.11 biotite conventional K-Ar PED-5-59 "4.76E-04, 0.589E-04, 1.18E-04*" 8.45 7.31 80 age of intrusion "K=7.04, 6.99%" 10889 2 74.59 orthoclase conventional K-Ar PED-5-59 "4.76E-04, 0.589E-04, 1.18E-04*" 12.03 13.19 95 "48-60 MESH, ABOUT 3% QUARTZ IMPURITY" "K=10.00, 9.98%" AGE TOO OLD--EXCESS ARGON PRESENT 10889 3 303.52 plagioclase conventional K-Ar PED-5-59 "4.76E-04, 0.589E-04, 1.18E-04*" 0.311 1.48 82 "48-60 MESH, ABOUT 40% OF SAMPLE WAS QUARTZ" "K=0.263, O.253%" AGE TOO OLD--EXCESS ARGON PRESENT 10890 1 50.89 biotite conventional K-Ar PED-6-64 "4.76E-04, 0.589E-04, 1.18E-04*" 8.37 6.22 6281 minimum age of intrusion 80-100 MESH "K=6.94, 6.96%; 40AR-RAD=5.92, 6.52 X E-10 MOL/GM" 10890 2 51.7 biotite conventional K-Ar PED-6-64 "4.76E-04, 0.589E-04, 1.18E-04*" 9.35 7.06 3685 minimum age of intrusion 35-48 MESH "K=7.75, 7.78%" 10890 3 53.66 muscovite conventional K-Ar PED-6-64 "4.76E-04, 0.589E-04, 1.18E-04*" 10.61 8.32 75 age of intrusion K=8.81% 10891 1 49.51 biotite conventional K-Ar PED-11-60 "4.76E-04, 0.589E-04, 1.18E-04*" 8.04 5.81 27 minimum age of intrusion "48-60 MESH, ABOUT 18% CHLORITE IMPURITY" "K=6.66, 6.68%" 10891 2 48.48 muscovite conventional K-Ar PED-11-60 "4.76E-04, 0.589E-04, 1.18E-04*" 10.56 7.47 71 minimum age of intrusion 48-60 MESH "K=8.74, 8.80%" 10891 3 55.42 muscovite conventional K-Ar PED-11-60 "4.76E-04, 0.589E-04, 1.18E-04*" 10.54 8.54 78 age of intrusion +20 MESH "K=8.73, 8.77%" 10891 4 31.01 microcline conventional K-Ar PED-11-60 "4.76E-04, 0.589E-04, 1.18E-04*" 13.79 6.21 93 48-35 MESH "K=11.44, 11.46%" "SPURIOUS AGE, TOO YOUNG" 10891 5 70.36 plagioclase conventional K-Ar PED-11-60 "4.76E-04, 0.589E-04, 1.18E-04*" 0.484 0.5 79 "28-35 MESH, ABOUT 30% OF SAMPLE WAS QUARTZ" "K=0.401, 0.402%" AGE TOO OLD--EXCESS AR PRESENT 10892 1 51.79 muscovite conventional K-Ar RM-9-63 "4.76E-04, 0.589E-04, 1.18E-04*" 10.84 8.2 92 age of intrusion "K=8.98, 9.01%" 10892 2 1125.65 albite conventional K-Ar RM-9-63 "4.76E-04, 0.589E-04, 1.18E-04*" 0.01 0.225 5023 K=0.008% AGE IS TOO OLD--EXCESS AR PRESENT 10893 1 258.64 muscovite conventional K-Ar AWL-5-65 "4.76E-04, 0.589E-04, 1.18E-04*" 10.47 41.92 9558 age of intrusion "K=8.70, 8.62, 8.74%; 40AR-RAD=41.50, 42.34 X E-10 MOL/GM" 10893 2 384.88 albite conventional K-Ar AWL-5-65 "4.76E-04, 0.589E-04, 1.18E-04*" 0.17 1.05 60 K=0.14% SPURIOUS AGE (TOO OLD)--EXCESS AR PRESENT 10894 1 24.67 muscovite conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 8.85 3.165 1166 age of metamorphic crystallization 4-5% BIOTITE PRESENT "K=7.36, 7.34%; 40AR-RAD=3.03, 3.34 X E-10 MOL/GM" 10894 2 25.65 biotite conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 6.91 2.57 66 age of metamorphic crystallization "K=5.73, 5.75%" 10894 3 27.48 orthoclase conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 13.37 5.33 94 minimum age of metamorphic crystallization 60-80 MESH "K=11.06, 11.13%" 10894 4 29.95 plagioclase conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 3.22 1.4 76 minimum age of metamorphic crystallization "60-80 MESH, ABOUT 3% QUARTZ IMPURITY" "K=2.71, 2.63%" 10895 1 28.25 biotite conventional K-Ar PED-18-62D "4.76E-04, 0.589E-04, 1.18E-04*" 9.22 3.78 74 age of metamorphic crystallization "K=7.64, 7.67%" 10897 1 0.35 0.02 sanidine conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.82 0.0539 25 age of volcanism 10898 1 1.11 0.02 sanidine conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 0.1647 45 age of volcanism 10899 1 0.43 0.05 sanidine conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 10.079 0.0631 8 maximum age of volcanism AVERAGE AGE OF 2 DETERMINATIONS IS O.34 M.Y. 10900 1 0.48 0.01 glass conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 4.74 0.0327 33 age of volcanism K-AR AGES RANGE FROM 0.479-0.64 M.Y. 10901 1 0.09 0.01 whole rock conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 4.72 0.0062 9 age of volcanism 10902 1 0.55 0.02 whole rock conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 4.69 0.0318 41 age of volcanism AGES VARY FROM 0.479-0.64 M.Y. 10903 1 1.34 0.29 whole rock conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.624 0.0314 5 age of volcanism 10904 1 0.26 0.04 sanidine conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 10.674 0.0401 7 AVERAGE AGE OF 2 DETERMINATIONS IS 0.34 M.Y. 10905 1 0.53 0.03 sanidine conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 11.272 0.0853 15 minimum age of volcanism 10906 1 0.58 0.02 sanidine conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 11.272 0.094 61 age of volcanism 10907 1 1.05 0.03 whole rock conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.609 0.0243 30 AGE IS SLIGHTLY TOO OLD. 10908 1 1.05 0.04 whole rock conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 1.609 0.0244 26 AGE IS SLIGHTLY TOO OLD 10909 1 1.33 0.53 whole rock conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.362 0.0261 2 age of volcanism 10910 1 1.51 0.04 whole rock conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 1.4 0.0304 35 age of volcanism SAMPLE FUSED FOR HALF-AN-HOUR LONGER THAN FIRST WHOLE-ROCK FUSION 10910 2 1.46 0.06 whole rock conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 1.4 0.0294 25 age not evaluated 10911 1 0.84 0.05 whole rock conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 1.389 0.0167 17 minimum age of volcanism 10912 1 0.86 0.04 whole rock conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 1.389 0.0172 20 minimum age of volcanism 10913 1 0.47 0.04 sanidine conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 10.604 0.0721 12 age of volcanism 10914 1 0.54 0.02 sanidine conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 9.787 0.0762 26 age of volcanism 10915 1 1.02 0.04 glass conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 4.551 0.0671 28 age of volcanism 10916 1 0.35 0.02 sanidine conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 10.488 0.0522 47 age of volcanism 10917 1 0.92 0.03 whole rock conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 3.438 0.0455 27 age of volcanism 10918 1 0.92 0.03 whole rock conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 3.438 0.0453 29 age of volcanism 10919 1 1.06 0.02 sanidine conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 11.056 0.1694 63 age of volcanism 10920 1 1.05 0.02 sanidine conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 11.056 0.1673 70 age of volcanism 10921 1 0.64 0.03 glass conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 4.74 0.0434 19 K-AR AGES RANGE FROM 0.479-0.64 M.Y. 10922 1 0.6 0.02 sanidine conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 9.211 0.0793 44 age of volcanism 10923 1 0.56 0.02 glass conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 4.736 0.0383 38 K-AR AGES RANGE FROM 0.479-0.64 M.Y. 10924 1 0.4 0.04 whole rock conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 3.44 0.0199 9 age of volcanism 10925 1 1.71 0.21 whole rock conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" 1.286 0.0316 8 age of volcanism 10926 1 1.66 0.1 whole rock conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 1.548 0.037 16 age of volcanism 10927 1 0.61 0.02 sanidine conventional K-Ar 32 "4.962E-04, 0.581E-04, 1.1167E-04" 11.22 0.0984 55 age of volcanism 10928 1 1.2 0.3 biotite conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 7.449 0.1276 5 age meaning uncertain (analysis questionable) 10929 1 0.86 0.02 sanidine conventional K-Ar 34 "4.962E-04, 0.581E-04, 1.1167E-04" 11.208 0.1394 51 age of intrusion 10929 2 0.82 0.02 sanidine conventional K-Ar 69 "4.962E-04, 0.581E-04, 1.1167E-04" 11.992 0.1405 73 minimum age of intrusion SANIDINE LEACHED WITH HF 10930 1 0.41 0.06 sanidine conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 11.245 0.0661 7 minimum age of volcanism 10931 1 1.15 0.02 sanidine conventional K-Ar 36 "4.962E-04, 0.581E-04, 1.1167E-04" 10.499 0.1738 80 age of volcanism 10932 1 0.52 0.06 whole rock conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 2.818 0.0211 9 age of volcanism 10933 1 0.54 0.02 sanidine conventional K-Ar 38 "4.962E-04, 0.581E-04, 1.1167E-04" 11.216 0.0874 72 age of volcanism 10934 1 0.5 0.02 sanidine conventional K-Ar 39 "4.962E-04, 0.581E-04, 1.1167E-04" 10.363 0.0751 39 age of volcanism 10935 1 1.45 0.12 whole rock conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 1.793 0.0374 12 age of volcanism 10936 1 0.48 0.03 whole rock conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 2.596 0.0178 14 age of volcanism 10937 1 1 0.05 whole rock conventional K-Ar 42 "4.962E-04, 0.581E-04, 1.1167E-04" 1.515 0.0218 21 age of volcanism 10938 1 1.96 0.06 whole rock conventional K-Ar 43 "4.962E-04, 0.581E-04, 1.1167E-04" 1.205 0.0339 31 age of volcanism 10939 1 2.06 0.02 sanidine conventional K-Ar 44 "4.962E-04, 0.581E-04, 1.1167E-04" 11.197 0.3319 84 age of volcanism 10940 1 0.98 0.09 whole rock conventional K-Ar 45 "4.962E-04, 0.581E-04, 1.1167E-04" 2.746 0.0389 10 age of volcanism 10941 1 0.98 0.09 whole rock conventional K-Ar 46 "4.962E-04, 0.581E-04, 1.1167E-04" 2.746 0.0389 11 age of volcanism 10942 1 0.44 0.08 whole rock conventional K-Ar 47 "4.962E-04, 0.581E-04, 1.1167E-04" 1.056 0.0067 5 minimum age of volcanism 10943 1 0.57 0.02 sanidine conventional K-Ar 48 "4.962E-04, 0.581E-04, 1.1167E-04" 11.798 0.0974 43 10944 1 1.66 0.12 whole rock conventional K-Ar 49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.472 0.0113 13 age of volcanism 10945 1 0.93 0.05 whole rock conventional K-Ar 50 "4.962E-04, 0.581E-04, 1.1167E-04" 1.44 0.0194 17 age of volcanism 10946 1 0.92 0.05 whole rock conventional K-Ar 51 "4.962E-04, 0.581E-04, 1.1167E-04" 1.44 0.0191 21 age of volcanism 10947 1 0.6 0.02 sanidine conventional K-Ar 52 "4.962E-04, 0.581E-04, 1.1167E-04" 11.667 0.1004 30 age of volcanism 10948 1 0.59 0.02 sanidine conventional K-Ar 53 "4.962E-04, 0.581E-04, 1.1167E-04" 10.561 0.0891 52 age of intrusion 10949 1 0.44 0.03 whole rock conventional K-Ar 54 "4.962E-04, 0.581E-04, 1.1167E-04" 2.568 0.0162 20 age of volcanism 10950 1 0.83 0.03 whole rock conventional K-Ar 55 "4.962E-04, 0.581E-04, 1.1167E-04" 2.535 0.0302 29 "AGE IS APPARENTLY TOO YOUNG, SHOULD BE 0.91 M.Y." 10950 2 0.86 0.03 whole rock conventional K-Ar 56 "4.962E-04, 0.581E-04, 1.1167E-04" 2.535 0.0315 31 FUSED FOR MORE THAN HALF AN HOUR "AGE IS APPARENTLY TOO YOUNG, SHOULD BE 0.91 M.Y." 10951 1 0.88 0.02 whole rock conventional K-Ar 57 "4.962E-04, 0.581E-04, 1.1167E-04" 2.679 0.0338 44 "AGE IS APPARENTLY TOO YOUNG, SHOULD BE 0.91 M.Y." 10952 1 0.9 0.04 whole rock conventional K-Ar 58 "4.962E-04, 0.581E-04, 1.1167E-04" 3.513 0.0453 24 age of volcanism 10953 1 0.9 0.03 whole rock conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 3.513 0.0453 26 age of volcanism 10954 1 0.81 0.06 whole rock conventional K-Ar 60 "4.962E-04, 0.581E-04, 1.1167E-04" 3.155 0.037 13 "AGE IS APPARENTLY TOO YOUNG, SHOULD BE 0.91 M.Y." 10954 2 0.88 0.06 whole rock conventional K-Ar 61 "4.962E-04, 0.581E-04, 1.1167E-04" 3.155 0.0399 16 FUSED FOR MORE THAN HALF AN HOUR "AGE IS APPARENTLY TOO YOUNG, SHOULD BE 0.91 M.Y." 10955 1 1.06 0.03 whole rock conventional K-Ar 62 "4.962E-04, 0.581E-04, 1.1167E-04" 2.59 0.0395 20 age of volcanism 10956 1 1.08 0.03 whole rock conventional K-Ar 63 "4.962E-04, 0.581E-04, 1.1167E-04" 2.59 0.0404 27 age of volcanism 10957 1 1.1 0.02 whole rock conventional K-Ar 64 "4.962E-04, 0.581E-04, 1.1167E-04" 2.59 0.0411 49 age of volcanism 10958 1 1.11 0.02 sanidine conventional K-Ar 65 "4.962E-04, 0.581E-04, 1.1167E-04" 11.024 0.1764 64 age of volcanism 10959 1 1.98 0.35 whole rock conventional K-Ar 66 "4.962E-04, 0.581E-04, 1.1167E-04" 1.942 0.0553 6 AVERAGE OF 3 K-AR AGES IS 2.05 M.Y. 10960 1 2.24 0.29 whole rock conventional K-Ar 67 "4.962E-04, 0.581E-04, 1.1167E-04" 1.942 0.0628 8 AVERAGE OF 3 K-AR AGES IS 2.05 M.Y. 10961 1 1.93 0.33 whole rock conventional K-Ar 68 "4.962E-04, 0.581E-04, 1.1167E-04" 1.942 0.054 6 AVERAGE OF 3 K-AR AGES IS 2.05 M.Y. 10962 1 0.89 0.03 whole rock conventional K-Ar 70 "4.962E-04, 0.581E-04, 1.1167E-04" 2.818 0.0361 27 minimum age of volcanism 10963 1 0.92 0.04 whole rock conventional K-Ar 71 "4.962E-04, 0.581E-04, 1.1167E-04" 2.818 0.0372 15 age of volcanism 10964 1 0.97 0.03 whole rock conventional K-Ar 72 "4.962E-04, 0.581E-04, 1.1167E-04" 2.015 0.0279 36 age of volcanism 10965 1 0.53 0.02 sanidine conventional K-Ar 73 "4.962E-04, 0.581E-04, 1.1167E-04" 10.594 0.0809 64 age of volcanism 10966 1 105.9 3.2 biotite conventional K-Ar 1. 73G013 "4.72E-04, 0.585E-04, 1.19E-04" 14.87 92 minimum age of intrusion 10966 2 102.9 3.1 hornblende conventional K-Ar 1. 73G013 "4.72E-04, 0.585E-04, 1.19E-04" 1.125 81 minimum age of intrusion 10967 1 111.1 4.4 hornblende conventional K-Ar 2. 7L681-H1 "4.72E-04, 0.585E-04, 1.19E-04" 0.396 30 age of intrusion 10968 1 106 2.3 hornblende conventional K-Ar 3. 7G012 "4.72E-04, 0.585E-04, 1.19E-04" 0.5125 5866 minimum age of intrusion 40AR-RAD=5.08 AND 5.17XE-11 MOL/GM 10969 1 104.8 3.1 biotite conventional K-Ar 4. 7L661-H1 "4.72E-04, 0.585E-04, 1.19E-04" 14.87 86 minimum age of intrusion 10970 1 106.2 3.2 biotite conventional K-Ar 5. 7L601-H1 "4.72E-04, 0.585E-04, 1.19E-04" 14.57 83 age of intrusion 10970 2 104.3 3.1 hornblende conventional K-Ar 5. 7L601-H1 "4.72E-04, 0.585E-04, 1.19E-04" 1.287 82 age of intrusion 10971 1 59.11 biotite conventional K-Ar 1. (PED-5-59) "4.76E-04, 0.589E-04, 1.18E-04*" 8.45 7.31 80 minimum age of intrusion K=7.015% 10972 1 69.51 biotite conventional K-Ar 2. (PED-27-61) "4.76E-04, 0.589E-04, 1.18E-04*" 7.87 8.03 92 age of intrusion K=6.535% 10973 1 66.11 biotite conventional K-Ar 3. (PED-22-59) "4.76E-04, 0.589E-04, 1.18E-04*" 7.54 7.31 71 age of intrusion K=6.26% 10974 1 68.66 biotite conventional K-Ar 4. (PED-21-59) "4.76E-04, 0.589E-04, 1.18E-04*" 6.67 6.72 65 age of intrusion K=5.54% 10975 1 58.79 biotite conventional K-Ar 5. (PED-23-59) "4.76E-04, 0.589E-04, 1.18E-04*" 7.73 6.65 69 age of volcanism K=6.42% 10976 1 60.86 sanidine conventional K-Ar 6. (PED-6-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.91 7.94 93 age of volcanism K=7.40% 10977 1 74.57 biotite conventional K-Ar 7. (PED-11-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.02 8.79 88 age of intrusion K=6.66% 10978 1 76.76 biotite conventional K-Ar 8. (PED-12-63) "4.76E-04, 0.589E-04, 1.18E-04*" 8.53 9.63 95 age of intrusion K=7.08% 10979 1 71.94 K feldspar conventional K-Ar 9. (MB-1-62) "4.76E-04, 0.589E-04, 1.18E-04*" 6.71 7.09 71 maximum age of volcanism K=5.57% 10980 1 66.43 K feldspar conventional K-Ar 9. (MB-3-62) "4.76E-04, 0.589E-04, 1.18E-04*" 12.43 12.11 60 age of volcanism K=10.32% 10981 1 61.85 biotite conventional K-Ar 10. (PED-19-62) "4.76E-04, 0.589E-04, 1.18E-04*" 8.82 7.99 90 age of volcanism K=7.32% 10982 1 58.14 biotite conventional K-Ar 11. (PED-15-62) "4.76E-04, 0.589E-04, 1.18E-04*" 8.24 7.01 85 age of volcanism K=6.84% 10983 1 75.8 biotite conventional K-Ar 12. (PED-12-61) "4.76E-04, 0.589E-04, 1.18E-04*" 7.42 8.27 81 age of volcanism K=6.16% 10984 1 60.07 biotite conventional K-Ar 13. (PED-8-62) "4.76E-04, 0.589E-04, 1.18E-04*" 9.29 8.17 91 minimum age of intrusion K=7.71% 10985 1 64.53 biotite conventional K-Ar 14. (RM-2-62) "4.76E-04, 0.589E-04, 1.18E-04*" 7.2 6.81 71 minimum age of intrusion K=5.975% 10986 1 55.42 muscovite conventional K-Ar 15. (PED-11-60) "4.76E-04, 0.589E-04, 1.18E-04*" 10.54 8.54 78 age of intrusion K=8.75% 10987 1 53.21 biotite conventional K-Ar 16. (PED-25-61) "4.76E-04, 0.589E-04, 1.18E-04*" 7.64 5.94 85 age of intrusion K=6.34% 10988 1 182 10 hornblende conventional K-Ar 1. (WA-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.223 0.7198 30 (*) THE 182 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10989 1 314.91 muscovite conventional K-Ar 2. (A-3) "4.72E-04, 0.585E-04, 1.19E-04*" 7.1 35.17 95 THE 309 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10990 1 293.13 hornblende conventional K-Ar 3. (WA-2) "4.72E-04, 0.585E-04, 1.19E-04*" 0.352 1.613 63 THE 286 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10991 1 138.49 biotite conventional K-Ar 4. (WA-5) "4.72E-04, 0.585E-04, 1.19E-04*" 1.66 3.44 82 THE 135 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10992 1 335.27 muscovite conventional K-Ar 5. (A-4) "4.72E-04, 0.585E-04, 1.19E-04*" 7.24 38.405 9887 "40AR-RAD=38.42, 38.42, 38.39XE-10 MOL/GM" THE 329 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10993 1 275.57 hornblende conventional K-Ar 8. (A-2) "4.72E-04, 0.585E-04, 1.19E-04*" 0.398 1.706 87 THE 270 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10994 1 278.6 hornblende conventional K-Ar 9. (A-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.332 1.44 81 THE 273 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10995 1 267.19 muscovite conventional K-Ar 10. (65CLE16) "4.72E-04, 0.585E-04, 1.19E-04*" 1.56 6.468 71 THE 262 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 10996 1 233.98 30 hornblende conventional K-Ar 11. (65CLE11) "4.905E-04, 0.566E-04, 1.18E-04" 0.064 0.2302 34 THE 229 M.Y. DATE IS RELATED TO SOME METAMORPHIC EVENT THAT OCCURRED AFTER THE SCHIST FORMED ABOUT 380 M.Y. AGO. 11001 1 144.48 muscovite conventional K-Ar 12. (CM120-63) "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 19.62 98 minimum age of metamorphic crystallization 11002 1 151.57 hornblende conventional K-Ar 13. (CM3-65) "4.72E-04, 0.585E-04, 1.19E-04*" 0.568 1.293 81 age of metamorphic crystallization 11003 1 150.06 hornblende conventional K-Ar 14. (CM9-65) "4.72E-04, 0.585E-04, 1.19E-04*" 1.08 2.433 91 age of metamorphic crystallization 11004 1 161.69 whole rock conventional K-Ar 15. (66CLE10) "4.72E-04, 0.585E-04, 1.19E-04*" 2.26 5.504 97 age of metamorphic crystallization 11005 1 136.56 actinolite conventional K-Ar 16. (65CLE13) "4.72E-04, 0.585E-04, 1.19E-04*" 0.139 0.2839 43 THIS AGE APPEARS TO BE TOO YOUNG; ROCK PROBABLY FORMED ABOUT 150 M.Y. AGO. 11006 1 195.58 whole rock conventional K-Ar 17. (66CLE6) "4.72E-04, 0.585E-04, 1.19E-04*" 2.51 7.465 98 THIS AGE APPEARS TO BE TOO OLD--PHYLLITE PROBABLY FORMED AROUND 150 M.Y. AGO. 11007 1 245.55 whole rock conventional K-Ar 18. (65CLE26) "4.72E-04, 0.585E-04, 1.19E-04*" 2.77 10.49 96 THIS AGE IS TOO OLD; PHYLLITE PROBABLY FORMED ABOUT 150 M.Y. AGO. 11008 1 151.85 whole rock conventional K-Ar 19. (65CLE25) "4.72E-04, 0.585E-04, 1.19E-04*" 2.29 5.223 89 age of metamorphic crystallization 11009 1 161.8 biotite conventional K-Ar 20. (65CLE4) "4.72E-04, 0.585E-04, 1.19E-04*" 6.52 15.89 68 THIS AGE MAY BE A REDUCED AGE. 11009 2 229.37 hornblende conventional K-Ar 20. (65CLE4) "4.72E-04, 0.585E-04, 1.19E-04*" 0.888 3.127 94 age of intrusion 11010 1 166.8 biotite conventional K-Ar 21A. (66CLE1) "4.72E-04, 0.585E-04, 1.19E-04*" 8.47 21.31 97 AGE MAY BE A REDUCED AGE 11010 2 174.85 hornblende conventional K-Ar 21A. (66CLE1) "4.72E-04, 0.585E-04, 1.19E-04*" 1.06 2.802 90 AGE MAY BE A REDUCED AGE 11011 1 135.04 biotite conventional K-Ar 21B. (66CLE2) "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 17.16 94 AGE APPEARS TO BE TOO YOUNG 11011 2 135.72 biotite conventional K-Ar 21B. (66CLE2) "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 17.25 96 AGE APPEARS TO BE TOO YOUNG 11012 1 251.38 hornblende conventional K-Ar 22. (65CLE3) "4.72E-04, 0.585E-04, 1.19E-04*" 0.254 0.9864 75 age of intrusion 11013 1 170.91 biotite conventional K-Ar 23. (65CLE29) "4.72E-04, 0.585E-04, 1.19E-04*" 6.3 16.26 94 age of intrusion 11014 1 168.76 biotite conventional K-Ar 24. (65CLE33) "4.72E-04, 0.585E-04, 1.19E-04*" 6.4 16.3 91 age of intrusion 11015 1 170.44 hornblende conventional K-Ar 25. (66CLE17) "4.72E-04, 0.585E-04, 1.19E-04*" 0.626 1.611 87 age of intrusion 11016 1 158.58 biotite conventional K-Ar 26. (66CLE18) "4.72E-04, 0.585E-04, 1.19E-04*" 8.98 21.43 92 age of intrusion 11016 2 160.49 hornblende conventional K-Ar 26. (66CLE18) "4.72E-04, 0.585E-04, 1.19E-04*" 1.22 2.948 91 age of intrusion 11017 1 157.8 biotite conventional K-Ar 27. (66CLE20) "4.72E-04, 0.585E-04, 1.19E-04*" 8.5 20.18 90 age of intrusion 11018 1 157.26 biotite conventional K-Ar 28. (66CLE21) "4.72E-04, 0.585E-04, 1.19E-04*" 4.84 11.45 93 age of intrusion 11018 2 155.38 hornblende conventional K-Ar 28. (66CLE21) "4.72E-04, 0.585E-04, 1.19E-04*" 0.586 1.369 87 age of intrusion 11019 1 150.63 biotite conventional K-Ar 29. (66CLE25) "4.72E-04, 0.585E-04, 1.19E-04*" 6.84 15.47 96 AGE APPEARS TOO YOUNG 11019 2 156.11 hornblende conventional K-Ar 29. (66CLE25) "4.72E-04, 0.585E-04, 1.19E-04*" 0.538 1.263 80 age of intrusion 11020 1 150.5 biotite conventional K-Ar 30. (CM77-63) "4.72E-04, 0.585E-04, 1.19E-04*" 7.2 16.27 96 age of intrusion 11020 2 148.97 hornblende conventional K-Ar 30. (CM77-63) "4.72E-04, 0.585E-04, 1.19E-04*" 0.776 1.735 86 age of intrusion 11021 1 135.83 biotite conventional K-Ar 31. (CM26-63) "4.72E-04, 0.585E-04, 1.19E-04*" 9.04 18.36 93 AGE APPEARS TOO YOUNG 11022 1 149.48 biotite conventional K-Ar 32. (CM29-60) "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 19.61 96 THIS AGE MAY BE TOO YOUNG 11022 2 164.07 hornblende conventional K-Ar 32. (CM29-60) "4.72E-04, 0.585E-04, 1.19E-04*" 1.03 2.547 89 AGE MAY BE THE TIME OF INTRUSION 11023 1 136.5 biotite conventional K-Ar 33. (65CLE6) "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 17.72 91 age of intrusion 11024 1 139.35 biotite conventional K-Ar 34. (65CLE8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.4 17.52 94 age of intrusion 11024 2 137.32 hornblende conventional K-Ar 34. (65CLE8) "4.72E-04, 0.585E-04, 1.19E-04*" 0.665 1.366 89 age of intrusion 11025 1 135.66 biotite conventional K-Ar 35. (A-5) "4.72E-04, 0.585E-04, 1.19E-04*" 8.44 17.12 96 age of intrusion 11025 2 130.7 hornblende conventional K-Ar 35. (A-5) "4.72E-04, 0.585E-04, 1.19E-04*" 0.47 0.9172 69 age of intrusion 11026 1 133.75 biotite conventional K-Ar 35. (65CLE19) "4.72E-04, 0.585E-04, 1.19E-04*" 7.88 15.75 89 age of intrusion 11026 2 132.55 hornblende conventional K-Ar 35. (65CLE19) "4.72E-04, 0.585E-04, 1.19E-04*" 0.438 0.8673 75 age of intrusion 11027 1 339.72 16 hornblende conventional K-Ar 37. (65CLE10) "4.72E-04, 0.585E-04, 1.19E-04*" 0.0482 0.2594 31 PRIMARY PYROXENE ALTERED TO HORNBLENDE AGE MAY BE TOO YOUNG 11028 1 446.9 18 hornblende conventional K-Ar 38. (66CLE7) "4.72E-04, 0.585E-04, 1.19E-04*" 0.0422 0.3081 64 age of intrusion 11029 1 423.1 17 hornblende conventional K-Ar 39. (66CLE8) "4.72E-04, 0.585E-04, 1.19E-04*" 0.0237 0.1627 64 age of intrusion 11032 1 20.59 1.5 hornblende conventional K-Ar KA-71-41 "4.72E-04, 0.585E-04, 1.19E-04*" 2.245 0.6693 14 "K=1.88, 1.85%" AGE APPEARS TO BE SPURIOUS 11032 2 22.36 0.8 hornblende conventional K-Ar KA-71-41 "4.72E-04, 0.585E-04, 1.19E-04*" 2.245 0.7273 28 AGE APPEARS TO BE SPURIOUS 11033 1 867.23 26 muscovite conventional K-Ar KA-71-70 "4.72E-04, 0.585E-04, 1.19E-04*" 9.675 155.1 100 age of intrusion "K=8.05, 8.01%" 11033 2 872.1 26 muscovite conventional K-Ar KA-71-70 "4.72E-04, 0.585E-04, 1.19E-04*" 9.675 156.2 100 age of intrusion "K=8.05, 8.01%" 11034 1 73.09 2 biotite conventional K-Ar KA-71-69 "4.72E-04, 0.585E-04, 1.19E-04*" 8.235 8.844 93 age of intrusion "K=6.85, 6.82%" 11034 2 73.56 2 biotite conventional K-Ar KA-71-69 "4.72E-04, 0.585E-04, 1.19E-04*" 8.235 8.902 93 age of intrusion "K=6.85, 6.82%" 11035 1 72.09 1.4 biotite conventional K-Ar KA-71-64 "4.72E-04, 0.585E-04, 1.19E-04*" 6.055 6.412 86 age of intrusion "K=5.03, 5.02%" 11035 2 72.09 1.4 biotite conventional K-Ar KA-71-64 "4.72E-04, 0.585E-04, 1.19E-04*" 6.055 6.412 86 age of intrusion "K=5.03, 5.02%" 11036 1 62.74 1.8 hornblende conventional K-Ar KA-71-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5515 0.5069 35 age of intrusion "K=0.462, 0.453%" 11036 2 64.79 1.8 hornblende conventional K-Ar KA-71-66 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5515 0.5238 35 age of intrusion "K=0.462, 0.453%" 11037 1 65.15 1.3 biotite conventional K-Ar KA-71-65 "4.72E-04, 0.585E-04, 1.19E-04*" 8.465 8.085 85 age of intrusion "K=7.01, 7.05%" 11037 2 67.02 1.3 biotite conventional K-Ar KA-71-65 "4.72E-04, 0.585E-04, 1.19E-04*" 8.465 8.322 85 age of intrusion "K=7.01, 7.05%" 11038 1 20.14 0.6 biotite conventional K-Ar KA-71-44 "4.72E-04, 0.585E-04, 1.19E-04*" 2.07 0.6037 33 age of intrusion BIOTITE AND CHLORITE "K=1.69, 1.74%" 11038 2 22.17 1 biotite conventional K-Ar KA-71-44 "4.72E-04, 0.585E-04, 1.19E-04*" 2.07 0.6648 22 age of intrusion BIOTITE AND CHLORITE "K=1.69, 1.74%" 11039 1 50.62 1 biotite conventional K-Ar KA-71-42 "4.72E-04, 0.585E-04, 1.19E-04*" 7.335 5.421 56 "K=6.16, 6.02%" AGE APPEARS TO BE TOO YOUNG 11039 2 50.08 1 biotite conventional K-Ar KA-71-42 "4.72E-04, 0.585E-04, 1.19E-04*" 7.335 5.363 62 "K=6.16, 6.02%" AGE APPEARS TO BE TOO YOUNG 11040 1 71.91 1.4 biotite conventional K-Ar KA-71-43 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 8.344 71 age of intrusion "K=6.57, 6.55%" 11040 2 75.3 1.5 biotite conventional K-Ar KA-71-43 "4.72E-04, 0.585E-04, 1.19E-04*" 7.9 8.746 88 age of intrusion "K=6.57, 6.55%" 11041 1 159.86 4.7 biotite conventional K-Ar KA-71-72 "4.72E-04, 0.585E-04, 1.19E-04*" 6.1 14.68 94 "K=5.04, 5.09%" AGE APPEARS SPURIOUS--TOO OLD 11041 2 162.67 4.7 biotite conventional K-Ar KA-71-72 "4.72E-04, 0.585E-04, 1.19E-04*" 6.1 14.95 94 "K=5.04, 5.09%" AGE APPEARS SPURIOUS--TOO OLD 11042 1 900.92 26 whole rock conventional K-Ar KA-71-71 "4.72E-04, 0.585E-04, 1.19E-04*" 0.875 14.72 86 age of intrusion "K=0.74, 0.71%" 11042 2 803.93 26 whole rock conventional K-Ar KA-71-71 "4.72E-04, 0.585E-04, 1.19E-04*" 0.875 12.76 90 minimum age of intrusion "K=0.74, 0.71%" 11043 1 1260.1 37 biotite conventional K-Ar KA-71-68 "4.72E-04, 0.585E-04, 1.19E-04*" 8.735 229.3 100 minimum age of intrusion "K=7.26, 7.24%" 11043 2 1244.22 37 biotite conventional K-Ar KA-71-68 "4.72E-04, 0.585E-04, 1.19E-04*" 8.735 225.3 100 minimum age of intrusion "K=7.26, 7.24%" 11044 1 1384.12 28 biotite conventional K-Ar KA-71-63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 271.5 99 age of intrusion "K=7.47, 7.57%" 11044 2 1250.43 26 biotite conventional K-Ar KA-71-63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 235.3 99 age of intrusion "K=7.47, 7.57%" 11044 3 1339.06 27 biotite conventional K-Ar KA-71-63 "4.72E-04, 0.585E-04, 1.19E-04*" 9.06 259 99 age of intrusion "K=7.47, 7.57%" 11045 1 1340.63 40 biotite conventional K-Ar KA-71-75 "4.72E-04, 0.585E-04, 1.19E-04*" 8.385 240.1 100 age of intrusion "K=6.92, 6.99%" 11045 2 1339.44 40 biotite conventional K-Ar KA-71-75 "4.72E-04, 0.585E-04, 1.19E-04*" 8.385 239.8 100 age of intrusion "K=6.92, 6.99%" 11046 1 62.01 1.8 biotite conventional K-Ar KA-71-73 "4.72E-04, 0.585E-04, 1.19E-04*" 8.995 8.17 90 age of intrusion "K=7.45, 7.49%" 11046 2 63.95 1.9 biotite conventional K-Ar KA-71-73 "4.72E-04, 0.585E-04, 1.19E-04*" 8.995 8.43 90 age of intrusion "K=7.45, 7.49%" 11047 1 26.19 0.8 phlogopite conventional K-Ar KA-71-74 "4.72E-04, 0.585E-04, 1.19E-04*" 7.635 2.9 55 age of volcanism "K=6.37, 6.31%" 11047 2 25.8 0.8 phlogopite conventional K-Ar KA-71-74 "4.72E-04, 0.585E-04, 1.19E-04*" 7.635 2.856 52 age of volcanism "K=6.37, 6.31%" 11049 1 26.81 0.7 biotite conventional K-Ar 3. (PED-1-69) "4.76E-04, 0.589E-04, 1.18E-04*" 8.64 3.36 73 age of volcanism "K=7.17%, ANALYTICAL DATA FROM DAMON AND OTHERS, 1970--AEC REPORT)" 11052 1 12.07 0.4 glass conventional K-Ar 6. (PED-1-70) "4.76E-04, 0.589E-04, 1.18E-04*" 5.47 0.954 52 age of volcanism "K=4.54%; ANALYTICAL DATA TAKEN FROM DAMON AND OTHERS, 1970--AEC REPORT)" 11054 1 9.5 0.5 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11055 1 7.6 0.4 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11056 1 11.1 0.5 whole rock conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11060 1 20.1 0.4 whole rock conventional K-Ar DKA2682 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11062 1 8.2 0.5 glass conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "DATE APPEARS TO BE TOO OLD, EXCESS ARGON PRESENT" 11072 1 23.33 0.6 biotite conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.52 2.88 76 age of volcanism 11072 2 23.49 0.6 sanidine conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04*" 9.93 3.38 92 age of volcanism 11073 1 22.76 0.5 alunite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 7.49 2.47 72 POTASSIUM DETERMINED BY ISOTOPE DILUTION AGE OF MINERALIZATION 11073 2 22.94 0.5 alunite conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04*" 7.49 2.49 54 POTASSIUM DETERMINED BY ISOTOPE DILUTION AGE OF MINERALIZATION 11083 1 4.5 0.2 biotite conventional K-Ar RICO 14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5479 43 age of intrusion 11086 1 5.45 0.2 sericite conventional K-Ar 57-49I "4.962E-04, 0.581E-04, 1.1167E-04" 8.44 0.799 64 AGE OF MINERALIZATION 11086 2 5.39 0.2 sericite conventional K-Ar 57-49II "4.962E-04, 0.581E-04, 1.1167E-04" 8.34 0.78 57 AGE OF MINERALIZATION 11087 1 31.37 1.2 plagioclase conventional K-Ar 1. RM-2-64 "4.962E-04, 0.581E-04, 1.1167E-04" 0.84 0.384 44 age of volcanism K=0.70% 11088 1 29.47 0.9 biotite conventional K-Ar 2. PED-7-65 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 3.862 6073 age of volcanism "K=7.40%; 40AR-RAD=388.8, 383.6XE-12 M/G" 11089 1 28.3 0.63 whole rock conventional K-Ar 3. UAKA-77-61 "4.962E-04, 0.581E-04, 1.1167E-04" 1.796 0.7371 6769 age of volcanism "K=1.491%; 40AR=73.05, 74.38XE-12 M/G" 11090 1 27.84 0.68 sanidine conventional K-Ar 4. PED-11-70 "4.962E-04, 0.581E-04, 1.1167E-04" 9.94 4.0126 91 age of volcanism 11091 1 27.2 0.6 biotite conventional K-Ar 5. UAKA-77-66 "4.962E-04, 0.581E-04, 1.1167E-04" 8.059 3.2786 7373 age of volcanism "K=6.690%; 40AR-RAD=327.16, 328.56XE-12 M/G" 11092 1 26.92 2.4 plagioclase conventional K-Ar 6. PED-3-69 "4.962E-04, 0.581E-04, 1.1167E-04" 1.41 0.55 20 age of volcanism K=1.17% 11093 1 26.71 0.65 sanidine conventional K-Ar 7. PED-10-70 "4.962E-04, 0.581E-04, 1.1167E-04" 7.53 2.915 89 age of volcanism K=6.25% 11094 1 25.65 0.54 whole rock conventional K-Ar 8. UAKA-77-62 "4.962E-04, 0.581E-04, 1.1167E-04" 3.143 1.169 949492 age of volcanism "K=2.609%; 40AR-RAD=117.4, 117.8, 115.4XE-12 M/G" 11095 1 24.93 2.6 plagioclase conventional K-Ar 9. PED-40-63 "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 0.3833 28 age of volcanism K=0.88% 11096 1 24.85 0.97 whole rock conventional K-Ar 10. PED-9-70 "4.962E-04, 0.581E-04, 1.1167E-04" 1.79 0.6462 33 age of volcanism K=1.49% 11097 1 23.85 0.8 whole rock conventional K-Ar 11. JKP-2-68 "4.962E-04, 0.581E-04, 1.1167E-04" 2.29 0.791 45 age of volcanism K=1.90% 11098 1 31.77 0.66 whole rock conventional K-Ar 12. UAKA-76-113 "4.962E-04, 0.581E-04, 1.1167E-04" 2.244 1.0135 878885 age of volcanism "K=1.86%; 40AR-RAD=103.6, 105.2, 101.8XE-12 M/G" 11099 1 29.61 1.69 sanidine conventional K-Ar 13. DM-2-68 "4.962E-04, 0.581E-04, 1.1167E-04" 10.43 4.483 89 age of volcanism K=8.66% 11100 1 26.94 0.82 sanidine conventional K-Ar 14. DM-5-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.1 3.162 98 age of volcanism K=6.72% 11101 1 26.42 0.65 biotite conventional K-Ar 15. DM-6-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 3.278 645866 age of volcanism "K=7.20, 7.04, 7.20%; 40AR-RAD=323.2, 323.2, 343.0XE-12 M/G" 11102 1 25.4 0.73 biotite conventional K-Ar 16. DM-3-68 "4.962E-04, 0.581E-04, 1.1167E-04" 9.01 3.318 68 age of intrusion K=7.48% 11103 1 25.11 1.18 sanidine conventional K-Ar 17. DM-1-68 "4.962E-04, 0.581E-04, 1.1167E-04" 9 3.253 91 age of volcanism K=7.47% 11104 1 30.91 0.77 biotite conventional K-Ar 18. UAKA-73-15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 3.876 62 age of intrusion K=7.17% 11105 1 29.96 0.74 biotite conventional K-Ar 19. UAKA-73-12 "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 3.614 66 age of intrusion K=6.90% 11106 1 29.59 0.9 biotite conventional K-Ar 20. PED-8-69 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 3.75 81 age of intrusion K=7.25% 11107 1 28.43 0.62 biotite conventional K-Ar 21. UAKA-73-13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.439 3.498 496162 age of intrusion "K=7.005%; 40AR-RAD=345.3, 349.1, 355.0XE-12 M/G" 11108 1 23.4 0.6 biotite conventional K-Ar 22. UAKA-72-67 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 2.944 54 age of intrusion K=7.21% 11109 1 31.43 0.68 whole rock conventional K-Ar 23. UAKA-75-105A "4.962E-04, 0.581E-04, 1.1167E-04" 4.14 1.889 939394 age of intrusion "K=3.44%; 40AR-RAD=189.0, 189.0, 188.7XE-12 M/G" 11110 1 30.03 0.65 sericite conventional K-Ar 24. UAKA-75-105 "4.962E-04, 0.581E-04, 1.1167E-04" 11.1 4.841 8787 "K=9.21%; 40AR-RAD=488.1, 480.1XE-12 M/G" AGE OF MINERALIZATION 11111 1 24.2 0.52 whole rock conventional K-Ar 25. UAKA-76-33 "4.962E-04, 0.581E-04, 1.1167E-04" 3.179 1.1148 8786 age of volcanism "K=2.639%; 40AR-RAD=112.41, 110.55XE-12 M/G" 11112 1 23.67 0.51 whole rock conventional K-Ar 26. UAKA-76-31 "4.962E-04, 0.581E-04, 1.1167E-04" 3.22 1.1041 8989 age of volcanism "K=2.673%; 40AR-RAD=109.20, 111.62XE-12 M/G" 11113 1 9.8 0.4 whole rock conventional K-Ar 1 "4.72E-04, 0.584E-04, 1.19E-04" 0.207 50 age of intrusion 11114 1 2.6 0.4 whole rock conventional K-Ar 2 "4.72E-04, 0.584E-04, 1.19E-04" 0.038 14 age of volcanism 11115 1 2.53 0.3 whole rock conventional K-Ar 3 "4.72E-04, 0.584E-04, 1.19E-04*" 2.03 0.074 29 age of volcanism 11116 1 2.6 0.3 whole rock conventional K-Ar 4. (3297) "4.72E-04, 0.584E-04, 1.19E-04" 0.085 25 age of volcanism 11117 1 2.5 0.2 whole rock conventional K-Ar 4. (3295) "4.72E-04, 0.584E-04, 1.19E-04" 0.078 55 age of volcanism 11118 1 25.3 0.6 whole rock conventional K-Ar 5. (3067) "4.72E-04, 0.584E-04, 1.19E-04" 1.89 84 age of volcanism 11119 1 24.9 0.6 whole rock conventional K-Ar 5. (3068) "4.72E-04, 0.584E-04, 1.19E-04" 1.29 86 age of volcanism 11120 1 2.8 0.2 whole rock conventional K-Ar 6 "4.72E-04, 0.584E-04, 1.19E-04" 0.084 41 age of volcanism 11121 1 2.8 0.1 whole rock conventional K-Ar 7 "4.72E-04, 0.584E-04, 1.19E-04" 0.063 33 age of volcanism 11122 1 47.1 3.2 hornblende conventional K-Ar 8 "4.72E-04, 0.584E-04, 1.19E-04" 0.725 77 maximum age of intrusion AGE MAY BE TOO OLD 11123 1 2.5 0.3 whole rock conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04" 0.03 21 age of volcanism 11124 1 34 2.2 hornblende conventional K-Ar 10 "4.72E-04, 0.584E-04, 1.19E-04" 0.539 64 age of intrusion 11125 1 0.19 0.04 whole rock conventional K-Ar 11 "4.72E-04, 0.584E-04, 1.19E-04" 0.0012 1 age of volcanism 11126 1 0.32 0.2 whole rock conventional K-Ar 12 "4.72E-04, 0.584E-04, 1.19E-04" 0.0037 2 age of volcanism 11127 1 1.01 0.1 whole rock conventional K-Ar 13. (2321) "4.72E-04, 0.584E-04, 1.19E-04" 0.038 4 age of volcanism 11128 1 1.31 0.05 whole rock conventional K-Ar 13. (2322) "4.72E-04, 0.584E-04, 1.19E-04" 0.045 9 age of volcanism 11129 1 1.12 0.04 whole rock conventional K-Ar 13. (2323) "4.72E-04, 0.584E-04, 1.19E-04" 0.042 22 age of volcanism 11130 1 3.4 0.4 whole rock conventional K-Ar 14 "4.72E-04, 0.584E-04, 1.19E-04" 0.154 14 age of intrusion 11131 1 7.2 0.6 whole rock conventional K-Ar 15 "4.72E-04, 0.584E-04, 1.19E-04" 0.249 38 SPURIOUS AGE 11132 1 3.7 0.4 whole rock conventional K-Ar 16 "4.72E-04, 0.584E-04, 1.19E-04" 0.062 34 age of volcanism 11133 1 21.2 0.8 whole rock conventional K-Ar 17 "4.72E-04, 0.584E-04, 1.19E-04" 0.561 65 age of volcanism 11134 1 3.1 0.5 whole rock conventional K-Ar 18 "4.72E-04, 0.584E-04, 1.19E-04" 0.034 13 age of volcanism 11135 1 24.3 1.5 whole rock conventional K-Ar 19 "4.72E-04, 0.584E-04, 1.19E-04" 1.241 76 age of volcanism 11136 1 26.3 1.1 biotite conventional K-Ar 20 "4.72E-04, 0.584E-04, 1.19E-04" 2.897 83 age of volcanism 11137 1 4.5 0.1 whole rock conventional K-Ar 21 "4.72E-04, 0.584E-04, 1.19E-04" 0.222 65 age of volcanism 11138 1 25.8 1 sanidine conventional K-Ar 22 "4.72E-04, 0.584E-04, 1.19E-04" 3.547 83 age of volcanism 11139 1 3.5 0.2 whole rock conventional K-Ar 23 "4.72E-04, 0.584E-04, 1.19E-04" 0.109 27 age of volcanism 11140 1 16.3 1.1 whole rock conventional K-Ar 24 "4.72E-04, 0.584E-04, 1.19E-04" 0.419 70 age of volcanism 11141 1 4 0.3 whole rock conventional K-Ar 25 "4.72E-04, 0.584E-04, 1.19E-04" 0.045 24 age of volcanism 11142 1 2.2 0.1 whole rock conventional K-Ar 26 "4.72E-04, 0.584E-04, 1.19E-04" 0.056 34 age of volcanism 11143 1 0.76 0.1 whole rock conventional K-Ar 27 "4.72E-04, 0.584E-04, 1.19E-04" 0.014 10 age of volcanism 11144 1 2.9 0.3 whole rock conventional K-Ar 28 "4.72E-04, 0.584E-04, 1.19E-04" 0.048 39 age of volcanism 11145 1 2.1 0.4 whole rock conventional K-Ar 29 "4.72E-04, 0.584E-04, 1.19E-04" 0.035 17 age of volcanism 11146 1 114 1.9 whole rock 39Ar-40Ar total fusion 1. 63YB-65 "4.962E-04, 0.581E-04, 1.1167E-04" 87 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11147 1 114 1.8 whole rock 39Ar-40Ar total fusion 2. 62YB-31B "4.962E-04, 0.581E-04, 1.1167E-04" 84 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11148 1 112 1.6 whole rock 39Ar-40Ar total fusion 3. 62YB-29 "4.962E-04, 0.581E-04, 1.1167E-04" 84 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11149 1 114 2.4 whole rock 39Ar-40Ar total fusion 4. 70YB-3A "4.962E-04, 0.581E-04, 1.1167E-04" 70 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11150 1 112 1.4 whole rock 39Ar-40Ar total fusion 5. 70CLE-20 "4.962E-04, 0.581E-04, 1.1167E-04" 90 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11151 1 120 1.8 whole rock 39Ar-40Ar total fusion 6. 70CLE-21 "4.962E-04, 0.581E-04, 1.1167E-04" 54 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11152 1 116 2.7 whole rock 39Ar-40Ar total fusion 7. 70CLE-22 "4.962E-04, 0.581E-04, 1.1167E-04" 71 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11153 1 120 2 whole rock 39Ar-40Ar total fusion 8. 63YB-84 "4.962E-04, 0.581E-04, 1.1167E-04" 78 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11154 1 119 7.9 whole rock 39Ar-40Ar total fusion 9. 64YB-9 "4.962E-04, 0.581E-04, 1.1167E-04" 23 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11155 1 130 7.2 whole rock 39Ar-40Ar total fusion 10. 62YB-90 "4.962E-04, 0.581E-04, 1.1167E-04" 67 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11156 1 121 1.5 whole rock 39Ar-40Ar total fusion 11. 64YB-13 "4.962E-04, 0.581E-04, 1.1167E-04" 90 SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11157 1 120 1.8 whole rock 39Ar-40Ar total fusion 12. 63YB-109 "4.962E-04, 0.581E-04, 1.1167E-04" 80 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11158 1 122 1.8 whole rock 39Ar-40Ar total fusion 13. 63BR-11 "4.962E-04, 0.581E-04, 1.1167E-04" 85 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11159 1 129 3.8 whole rock 39Ar-40Ar total fusion 14. P-1042 "4.962E-04, 0.581E-04, 1.1167E-04" 86 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11160 1 106 3.1 whole rock 39Ar-40Ar total fusion 15. P-48 "4.962E-04, 0.581E-04, 1.1167E-04" 86 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11160 2 103 3.1 whole rock conventional K-Ar 14. P-48 "4.962E-04, 0.581E-04, 1.1167E-04" 2.84 4.36 92 age of metamorphic crystallization 11161 1 121 2.5 whole rock 39Ar-40Ar total fusion 16. P-1016 "4.962E-04, 0.581E-04, 1.1167E-04" 47 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11162 1 100 3 whole rock conventional K-Ar 17. P-1013C "4.962E-04, 0.581E-04, 1.1167E-04" 1.42 2.113 89 age of metamorphic crystallization 11163 1 120 3.6 whole rock conventional K-Ar 65CLE-34A "4.962E-04, 0.581E-04, 1.1167E-04" 2.18 3.908 95 age of metamorphic crystallization 11164 1 148 1.8 whole rock 39Ar-40Ar total fusion 18. I-11-74 "4.962E-04, 0.581E-04, 1.1167E-04" 93 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11165 1 151 4.4 whole rock conventional K-Ar 19. I-9-74 "4.962E-04, 0.581E-04, 1.1167E-04" 93 age of metamorphic crystallization 11166 1 153 4.5 whole rock 39Ar-40Ar total fusion 20. I-8-74 "4.962E-04, 0.581E-04, 1.1167E-04" 84 age of metamorphic crystallization SEE PUBLISHED ARTICLE FOR 40AR-39AR ANALYTICAL DATA 11189 1 36.9 1.2 K feldspar conventional K-Ar PP269 "4.72E-04, 0.584E-04, 1.19E-04" 2.619 918686 "K=3.91, 4.00%; 40AR-RAD=6.07, 5.75, 5.79XE-6 SCC/G" "THIS DATE APPEARS TOO OLD, AGE MAY BE 33.8 M.Y. OLD." 11189 2 33.8 1.3 amphiboles conventional K-Ar PP269 "4.72E-04, 0.584E-04, 1.19E-04" 0.287 524835 age of intrusion "K=0.481, 0.467%; 40AR-RAD=0.615, 0.661, 0.654XE-6 SCC/G" 11190 1 35.6 0.8 K feldspar conventional K-Ar PP37 "4.72E-04, 0.584E-04, 1.19E-04" 3.6565 9593 "K=5.79, 5.68%; 40AR-RAD=8.19, 8.20XE-6 SCC/G" FOUR AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 35.3 M.Y. FOR THE DECIE FORMATION. 11191 1 34.6 0.8 K feldspar conventional K-Ar PP173 "4.72E-04, 0.584E-04, 1.19E-04" 3.3915 9492 "K=5.47, 5.47%; 40AR-RAD=7.59, 7.61XE-6 SCC/G" FOUR AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 35.3 M.Y. FOR THE DECIE FORMATION. 11192 1 35.2 0.8 K feldspar conventional K-Ar PP215 "4.72E-04, 0.584E-04, 1.19E-04" 3.2595 9388 "K=5.12, 5.20%; 40AR-RAD=7.17, 7.44XE-6 SCC/G" FOUR AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 35.3 M.Y. FOR THE DECIE FORMATION. 11193 1 35.6 0.8 K feldspar conventional K-Ar PP220 "4.72E-04, 0.584E-04, 1.19E-04" 3.661 9595 "K=5.70, 5.76%; 40AR-RAD=8.29, 8.12XE-6 SCC/G" FOUR AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 35.3 M.Y. FOR THE DECIE FORMATION 11194 1 36.8 0.7 sanidine conventional K-Ar GC1 "4.72E-04, 0.584E-04, 1.19E-04" 3.4135 8381 "K=6.24, 6.28, 6.19%; 40AR-RAD=7.61, 7.69XE-6 SCC/G" SPURIOUS AGE--TOO OLD 11195 1 35.7 0.7 anorthoclase conventional K-Ar BS1 "4.72E-04, 0.584E-04, 1.19E-04" 3.7235 9183 age of volcanism "K=5.80, 5.82%; 40AR-RAD=8.43, 8.26XE-6 SCC/G" 11196 1 35.1 0.7 anorthoclase conventional K-Ar BS2 "4.72E-04, 0.584E-04, 1.19E-04" 3.5315 7480 age of volcanism "K=5.62, 5.60%; 40AR-RAD=7.77, 8.06XE-6 SCC/G" 11197 1 35.9 1.7 anorthoclase conventional K-Ar BS3 "4.72E-04, 0.584E-04, 1.19E-04" 3.813 8676 age of volcanism "K=5.90, 5.95%; 40AR-RAD=8.83, 8.26XE-6 SCC/G" 11198 1 35.5 0.7 anorthoclase conventional K-Ar BS4 "4.72E-04, 0.584E-04, 1.19E-04" 3.764 8981 age of volcanism "K=5.84, 5.98%; 40AR-RAD=8.41, 8.46XE-6 SCC/G" 11199 1 35.9 0.7 K feldspar conventional K-Ar 21-9 "4.72E-04, 0.584E-04, 1.19E-04" 3.5335 8482 age of volcanism "K=5.52, 5.49, 5.49, 5.45%; 40AR-RAD=8.04XE-6 SCC/G" 11200 1 36.5 0.7 K feldspar conventional K-Ar SL3 "4.72E-04, 0.584E-04, 1.19E-04" 3.4047 847965 age of volcanism "K=5.22, 5.17%; 40AR-RAD=7.57, 7.69, 7.63XE-6 SCC/G" 11201 1 36.8 0.7 anorthoclase conventional K-Ar 22-12 "4.72E-04, 0.584E-04, 1.19E-04" 3.614 9183 age of volcanism "K=5.51, 5.46, 5.48, 5.44%; 40AR-RAD=8.06, 8.14XE-6 SCC/G" 11202 1 37.3 0.7 anorthoclase conventional K-Ar SP2 "4.72E-04, 0.584E-04, 1.19E-04" 3.8395 9284 age of volcanism "K=5.68, 5.78%; 40AR-RAD=8.79, 8.42XE-6 SCC/G" 11203 1 37.8 0.7 anorthoclase conventional K-Ar G1 "4.72E-04, 0.584E-04, 1.19E-04" 3.251 7985 "K=4.78, 4.81%; 40AR-RAD=7.35, 7.22XE-6 SCC/G" SIX AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 36.6 M.Y. FOR THE GOMEZ TUFF 11204 1 36.7 1.4 anorthoclase conventional K-Ar 22-7 "4.72E-04, 0.584E-04, 1.19E-04" 3.122 494639 "K=4.76, 4.74, 4.75, 4.71%; 40AR-RAD=7.21, 6.69, 7.09XE-6 SCC/G" SIX AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 36.6 M.Y. FOR THE GOMEZ TUFF 11205 1 36.1 0.7 anorthoclase conventional K-Ar G3 "4.72E-04, 0.584E-04, 1.19E-04" 3.2527 919170 "K=4.97, 5.07%; 40AR-RAD=7.14, 7.49, 7.24XE-6 SCC/G" SIX AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 36.6 M.Y. FOR THE GOMEZ TUFF. 11206 1 35.9 0.7 anorthoclase conventional K-Ar G4 "4.72E-04, 0.584E-04, 1.19E-04" 3.202 838769 "K=4.97%; 40AR-RAD=7.00, 7.34, 7.19XE-6 SCC/G" SIX AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 36.6 M.Y. FOR THE GOMEZ TUFF 11207 1 36.8 0.7 anorthoclase conventional K-Ar G6 "4.72E-04, 0.584E-04, 1.19E-04" 2.9115 7986 "K=4.38, 4.44%; 40AR-RAD=6.54, 6.51XE-6 SCC/G" SIX AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 36.6 M.Y. FOR THE GOMEZ TUFF 11208 1 36.5 0.7 anorthoclase conventional K-Ar G7 "4.72E-04, 0.584E-04, 1.19E-04" 3.5225 7673 "K=5.34, 5.41%; 40AR-RAD=7.88, 7.91XE-6 SCC/G" SIX AGE DETERMINATIONS GIVE AN AVERAGE AGE OF 36.6 M.Y. FOR THE GOMEZ TUFF. 11209 1 37.2 0.7 anorthoclase conventional K-Ar 5/26/1967 "4.72E-04, 0.584E-04, 1.19E-04" 3.5275 8382 age of volcanism "K=5.29%; 40AR-RAD=7.94, 7.87XE-6 SCC/G" 11210 1 38.4 0.7 plagioclase conventional K-Ar DP-60 "4.72E-04, 0.584E-04, 1.19E-04" 0.7183 7465 minimum age of volcanism "K=1.05, 1.04%; 40AR-RAD=1.57, 1.65XE-6 SCC/G" 11211 1 1.84 0.72 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.042 5 age of volcanism 11212 1 2.24 0.15 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.084 35 age of volcanism 11213 1 3.35 1.48 whole rock conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.027 5 age of volcanism 11214 1 3.75 0.77 whole rock conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.019 11 age of volcanism 11215 1 8.55 2.04 plagioclase conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.069 9 SPURIOUS AGE; TOO OLD 11216 1 2.31 0.14 whole rock conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.088 42 age of volcanism 11217 1 3.52 0.2 whole rock conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.127 45 age of volcanism 11218 1 3.12 0.17 whole rock conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.137 47 age of volcanism 11219 1 4.84 0.24 whole rock conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 59 age of volcanism 11220 1 10.15 0.53 biotite conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.723 56 age of volcanism THE 5.83% FOR POTASSIUM VALUE IS WRONG 11220 2 10.28 0.57 plagioclase conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.102 58 age of volcanism 11221 1 3.91 0.27 glass conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.253 33 age of volcanism 11222 1 26.53 1.26 biotite conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 3.233 74 age of volcanism 11222 2 24.41 0.85 sanidine conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 3.017 89 age of volcanism 11223 1 22.28 0.81 sanidine conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 9.555 2.985 93 "K20=9.28, 9.22, 10.47, 9.25%" 11224 1 22.9 1.5 alunite conventional K-Ar 1. DKA3633 "4.962E-04, 0.581E-04, 1.1167E-04" 1.508 38 TIME OF HYDROTHERMAL ALTERATION 11225 1 23.3 1.1 alunite conventional K-Ar 2. DKA3635 "4.962E-04, 0.581E-04, 1.1167E-04" 2.956 61 TIME OF HYDROTHERMAL ALTERATION 11245 1 3.3 0.12 whole rock conventional K-Ar 1. UAKA72-61 "4.962E-04, 0.581E-04, 1.1167E-04" 1.26 0.0601 38 age of volcanism K=1.05% 11246 1 0.54 0.05 whole rock conventional K-Ar 2. UAKA 74-44 "4.962E-04, 0.581E-04, 1.1167E-04" 1.17 0.0091 151522 age of volcanism "K=0.967, 0.970%; 40AR-RAD=0.925, 0.894, 0.923XE-12 M/G" 11247 1 0.27 0.05 whole rock conventional K-Ar 3. UAKA 75-109 "4.962E-04, 0.581E-04, 1.1167E-04" 1.419 0.56 929292 age of volcanism "K=1.173, 1.182%; 40AR-RAD=0.550, 0.530, 0.600XE-12 M/G" 11248 1 76.4 3 sericite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 9.31 10.46 75 HYDROTHERMAL SERICITE K=7.73% TIME OF HYDROTHERMAL ACTIVITY 11249 1 73.95 2.7 sericite conventional K-Ar GS-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.19 8.9 72 K=6.80% TIME OF HYDROTHERMAL ACTIVITY 11250 1 77.13 3.8 hornblende conventional K-Ar 19A "4.962E-04, 0.581E-04, 1.1167E-04" 0.865 0.981 22 age of intrusion K=0.718% 11251 1 62.69 2.3 K feldspar conventional K-Ar H7-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.169 7.5 72 minimum age of intrusion K=6.781% 11252 1 58 1.2 K feldspar conventional K-Ar 1. UAKA-78-64 "4.962E-04, 0.581E-04, 1.1167E-04" 9.55 8.099 959495 "K=7.93%; 40AR-RAD=812.1, 806.6, 810.9XE-12 M/G" PROBABLE TIME OF MINERALIZATION 11253 1 56.7 1.2 sericite conventional K-Ar 2. UAKA-75-118 "4.962E-04, 0.581E-04, 1.1167E-04" 10.13 8.408 9595 "K=8.41%; 40AR-RAD=847.7, 833.9XE-12 M/G" PROBABLE TIME OF MINERALIZATION 11254 1 52.2 1.1 muscovite conventional K-Ar 3. RM-9-63 "4.962E-04, 0.581E-04, 1.1167E-04" 10.83 8.25 97 K=8.99% PROBABLY A HYBRID AGE 11255 1 51.4 1.2 biotite conventional K-Ar 4. UAKA-76-46 "4.962E-04, 0.581E-04, 1.1167E-04" 9.32 7.003 78 K=7.74% THIS IS A HYBRID DATE 11256 1 49.9 1 biotite conventional K-Ar 5. UAKA-75-116 "4.962E-04, 0.581E-04, 1.1167E-04" 8.88 6.468 9292 SLIGHTLY CHLORITIZED "K=7.37%; 40AR-RAD=653.4, 640.2XE-12 M/G" A REDUCED AGE 11257 1 41.9 0.9 biotite conventional K-Ar 6. UAKA-76-45 "4.962E-04, 0.581E-04, 1.1167E-04" 9.162 5.591 86868787 "K=7.605%; 40AR-RAD=558.2, 559.0, 554.5, 564.6XE-12 M/G" THIS IS A REDUCED AGE 11258 1 36 0.8 muscovite conventional K-Ar 7. UAKA-78-63 "4.962E-04, 0.581E-04, 1.1167E-04" 9.257 4.845 929292 "K=7.684%; 40AR-RAD=490.5, 483.0, 480.1XE-12 M/G" THIS IS A REDUCED AGE--POSSIBLY A PRECAMBRIAN GRANITE 11259 1 26.3 0.6 biotite conventional K-Ar 8. UAKA-74-89 "4.962E-04, 0.581E-04, 1.1167E-04" 8.32 3.178 9297 age of intrusion "K=6.91%; 40AR-RAD=316.1, 319.6XE-12 M/G" 11260 1 4.12 0.11 hornblende conventional K-Ar GV76-30 "4.962E-04, 0.581E-04, 1.1167E-04" 1.059 0.0628 20 age of intrusion "K20=1.061, 1.057%" 11261 1 4.03 0.26 hornblende conventional K-Ar GV76-34 "4.962E-04, 0.581E-04, 1.1167E-04" 1.186 0.069 33 age of intrusion 11266 1 604.18 18 muscovite conventional K-Ar 1. ME168-F "4.72E-04, 0.584E-04, 1.19E-04*" 10.54 108.9 94 age of intrusion K=8.75% 11267 1 608.02 15 muscovite conventional K-Ar 2. ME168-G "4.72E-04, 0.584E-04, 1.19E-04*" 10.26 106.8 92 age of intrusion K=8.52% 11280 1 69.03 2.4 sanidine conventional K-Ar 1. JKR-54-2 "4.72E-04, 0.585E-04, 1.19E-04*" 12.121 12.28 7286 SANIDINE CONCENTRATE WITH OTHER K-FELDSPAR AND CLAY MINERALS "K=10.227, 9.896%; 40AR-RAD=0.04732, 0.05087 PPM" "AGE TOO YOUNG; REVISED AGE OF 72.4 M.Y. REPORTED BY BROOKINS (ISOCHRON/WEST, NO. 35, 1982)." 11280 2 69.9 2.6 biotite conventional K-Ar 2. JKR-54-2 "4.72E-04, 0.585E-04, 1.19E-04*" 7.369 7.561 7978 SOME ALTERED BIOTITE "K=6.168, 6.066%; 40AR-RAD=0.02910, 0.03134 PPM" "AGE TOO YOUNG; REVISED AGE OF 71.3 M.Y. REPORTED BY BROOKINS (ISOCHRON/WEST, NO. 35, 1982)." 11281 1 66.55 2.4 sanidine conventional K-Ar 3. JKR-62-2 "4.72E-04, 0.585E-04, 1.19E-04*" 11.29 11.02 8369 age of volcanism SANIDINE WITH A HIGH PERCENTAGE OF CLAY MINERALS "K=9.269, 9.474%; 40AR-RAD=0.04193, 0.04619 PPM" 11282 1 66.38 2.4 sanidine conventional K-Ar 4. JKR-93-2 "4.72E-04, 0.585E-04, 1.19E-04*" 11.249 10.95 847789 age of volcanism SANIDINE CONCENTRATE WITH MINOR QUARTZ AND CONSIDERABLE CLAY MINERALS "K=9.472, 9.203%; 40AR-RAD=0.04363, 0.04362, 0.04399 PPM" 11283 1 0.43 0.01 sanidine conventional K-Ar 4D069 "4.72E-04, 0.585E-04, 1.19E-04" 0.0661 2554 age of volcanism "40AR-RAD=0.6575, 0.6650XE-11 M/G" 11284 1 0.49 0.01 sanidine conventional K-Ar 3X074 "4.72E-04, 0.585E-04, 1.19E-04" 0.0738 7439 age of volcanism "40AR-RAD=0.7341, 0.7426XE-11 M/G" 11285 1 0.5 0.01 sanidine conventional K-Ar 3X203 "4.72E-04, 0.585E-04, 1.19E-04" 0.0752 4943 age of volcanism "40AR-RAD=0.7327, 0.7722XE-11 M/G" 11286 1 0.54 0.01 sanidine conventional K-Ar 3X062 "4.72E-04, 0.585E-04, 1.19E-04" 0.0807 3659 age of volcanism "40AR-RAD=0.7872, 0.8277XE-11 M/G" 11287 1 0.71 0.02 sanidine conventional K-Ar 4D003 "4.72E-04, 0.585E-04, 1.19E-04" 0.0888 8063 age of volcanism "40AR-RAD=0.8663, 0.9101XE-11 M/G" 11288 1 0.73 0.01 sanidine conventional K-Ar 4D001 "4.72E-04, 0.585E-04, 1.19E-04" 0.0918 5361 age of volcanism "40AR-RAD=0.9130, 0.9237XE-11 M/G" 11289 1 0.82 0.07 sanidine conventional K-Ar 3X122 "4.72E-04, 0.585E-04, 1.19E-04" 0.1054 71 THIS AGE MAY BE TOO OLD 11290 1 0.69 0.01 sanidine conventional K-Ar 4D214 "4.72E-04, 0.585E-04, 1.19E-04" 0.0883 42686477 age of volcanism "40AR-RAD=0.8100, 0.8740, 0.9179, 0.9296XE-11 M/G" 11291 1 0.88 0.03 sanidine conventional K-Ar 4D002 "4.72E-04, 0.585E-04, 1.19E-04" 0.117 7957 age of volcanism "40AR-RAD=1.154, 1.187XE-11 M/G" 11292 1 0.89 0.02 sanidine conventional K-Ar 3X189 "4.72E-04, 0.585E-04, 1.19E-04" 0.117 7957 age of volcanism "40AR-RAD=1.154, 1.187XE-11 M/G" 11293 1 1.22 0.04 sanidine conventional K-Ar 3X117 "4.72E-04, 0.585E-04, 1.19E-04" 0.1266 7731 "40AR-RAD=1.219, 1.312XE-11 M/G" THIS DATE APPEARS TO BE TOO OLD 11294 1 1.06 0.05 glass conventional K-Ar 4D005 "4.72E-04, 0.585E-04, 1.19E-04*" 4.61 0.0707 2423 age of volcanism "40AR-RAD=0.7053, 0.7087XE-11 M/G" 11295 1 1.15 0.03 glass conventional K-Ar 4D004 "4.72E-04, 0.585E-04, 1.19E-04" 0.0782 3740 age of volcanism "40AR-RAD=0.7979, 0.7669XE-11 M/G" 11296 1 1.71 0.07 biotite conventional K-Ar 4D207 "4.72E-04, 0.585E-04, 1.19E-04" 0.0198 35 age not evaluated 11297 1 1.28 0.06 sanidine conventional K-Ar 4D013 "4.72E-04, 0.585E-04, 1.19E-04" 0.1719 48 age not evaluated 11297 2 1.6 0.11 biotite conventional K-Ar 4D013 "4.72E-04, 0.585E-04, 1.19E-04" 0.177 33 age not evaluated 11298 1 3.25 0.32 plagioclase conventional K-Ar 3X114 "4.72E-04, 0.585E-04, 1.19E-04" 0.0629 37 age not evaluated 11299 1 1.25 0.11 sanidine conventional K-Ar 3X110 "4.72E-04, 0.585E-04, 1.19E-04" 0.1308 70 age not evaluated 11300 1 1.19 0.04 anorthoclase conventional K-Ar 3X241 "4.72E-04, 0.585E-04, 1.19E-04" 0.093 5746 maximum age of volcanism "40AR-RAD=0.9812, 0.8796XE-11 M/G" 11301 1 1.24 0.05 anorthoclase conventional K-Ar 5A057 "4.72E-04, 0.585E-04, 1.19E-04" 0.1038 50 maximum age of volcanism 11302 1 1.02 0.04 sanidine conventional K-Ar 3X151 "4.72E-04, 0.585E-04, 1.19E-04" 0.1046 6971 minimum age of volcanism "40AR-RAD=0.9662, 1.126XE-11 M/G" 11303 1 1.06 0.03 sanidine conventional K-Ar 3X170 "4.72E-04, 0.585E-04, 1.19E-04" 0.1132 7573 minimum age of volcanism "40AR-RAD=1.117, 1.146XE-11 M/G" 11304 1 1.09 0.03 sanidine conventional K-Ar 4D014 "4.72E-04, 0.585E-04, 1.19E-04" 0.1177 7961 age of volcanism SANIDINE FROM PUMICE FRAGMENTS "40AR-RAD=1.117, 1.236XE-11 M/G" 11305 1 1.48 0.09 sanidine conventional K-Ar 3X177 "4.72E-04, 0.585E-04, 1.19E-04" 0.1561 79 maximum age of volcanism 11306 1 1.44 0.04 sanidine conventional K-Ar 3X146 "4.72E-04, 0.585E-04, 1.19E-04" 0.1431 6477 maximum age of volcanism "40AR-RAD=1.372, 1.490XE-11 M/G" 11307 1 1.37 0.04 sanidine conventional K-Ar 4D015 "4.72E-04, 0.585E-04, 1.19E-04" 0.1413 8464 age of volcanism SANIDINE FROM PUMICE FRAGMENTS "40AR-RAD=1.386, 1.440XE-11 M/G" 11308 1 1710 40 biotite conventional K-Ar M-83 "4.962E-04, 0.581E-04, 1.1167E-04" 8.72 357.3 100 Peterman and others (1980) minimum age of metamorphic crystallization ANALYTICAL DATA SUPPLIED BY R.F. MARVIN; POTASSIUM DETERMINED BY ISOTOPE DILUTION "THIS K-AR BIOTITE AGE AGREES WITH THE RB-SR BIOTITE-WHOLE-ROCK AGE OF 1718 M.Y. THE SM-ND MODEL AGE IS 3919 M.Y. PETERMAN, ZARTMAN, AND SIMS (1980) REPORT A ZIRCON CONCORDIA-INTERCEPT-AGE OF 3560 M.Y. FOR THIS SAMPLE." 11309 1 13.6 0.5 whole rock conventional K-Ar 1. PED-10-65 "4.962E-04, 0.581E-04, 1.1167E-04" 0.431 70 age of volcanism 11310 1 2.87 0.2 whole rock conventional K-Ar 2. PED-31-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0559 201920 age of volcanism "40AR-RAD=5.37, 5.56, 5.83XE-12 MOL/GM" 11311 1 6.87 0.2 whole rock conventional K-Ar 3. PED-34-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0773 56 age of volcanism 11312 1 7.06 0.49 whole rock conventional K-Ar 4. PED-37-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1176 1415 age of volcanism "40AR-RAD=11.46, 12.05XE-12 MOL/GM" 11313 1 4.75 0.26 whole rock conventional K-Ar 5. PED-39-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0818 1617 age of volcanism 11314 1 3.47 0.63 whole rock conventional K-Ar 6. PED-42-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.045 668 age of volcanism "40AR-RAD=4.09, 4.18, 5.74XE-12 MOL/GM" 11314 2 3.67 0.09 whole rock conventional K-Ar 6. PED-42-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0499 424445 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID "40AR-RAD=4.88, 5.06, 5.02XE-12 MOL/GM" 11315 1 0.29 0.09 whole rock conventional K-Ar 7. PED-53-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0042 115 age of volcanism "40AR-RAD=0.55, 0.29XE-12 MOL/GM" 11315 2 0.3 0.3 whole rock conventional K-Ar 7. PED-53-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0046 13121013 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID "40AR-RAD=0.52, 0.50, 0.36, 0.45XE-12 MOL/GM" 11316 1 12.6 0.08 whole rock conventional K-Ar 8. CAL-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.57 0.1044 23 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11317 1 12.1 0.4 whole rock conventional K-Ar 9. CAL-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.75 0.3066 40 age of volcanism 11318 1 13.6 0.2 whole rock conventional K-Ar 10. CAL-3 "4.962E-04, 0.581E-04, 1.1167E-04" 2.11 0.4142 59 age of volcanism 11319 1 7.6 0.3 whole rock conventional K-Ar 11. ESC-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.7 0.186 33 age of volcanism 11320 1 0.5 0.1 whole rock conventional K-Ar 12. ESC-5 "4.962E-04, 0.581E-04, 1.1167E-04" 2.84 0.0212 12 age of volcanism 11321 1 7.7 0.2 whole rock conventional K-Ar 13. ESC-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.25 0.1397 45 age of volcanism 11322 1 10.8 0.6 whole rock conventional K-Ar 14. ESC-7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.56 0.2427 35 age of volcanism 11323 1 10.1 0.2 whole rock conventional K-Ar 15. ESC-9 "4.962E-04, 0.581E-04, 1.1167E-04" 3.08 0.4484 40 age of volcanism 11324 1 6.4 0.3 whole rock conventional K-Ar 16. ESC "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 0.1801 20 age of volcanism 11325 1 1.2 0.1 whole rock conventional K-Ar 17. SG-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.65 0.0295 19 age of volcanism 11326 1 1.5 0.2 whole rock conventional K-Ar 18. SG-67 "4.962E-04, 0.581E-04, 1.1167E-04" 1.5 0.0331 9 age of volcanism 11327 1 1.1 0.1 whole rock conventional K-Ar 19. SG-70 "4.962E-04, 0.581E-04, 1.1167E-04" 1.48 0.0225 21 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11328 1 1 0.1 whole rock conventional K-Ar 20. SG-74 "4.962E-04, 0.581E-04, 1.1167E-04" 1.48 0.0221 14 age of volcanism 11329 1 2.3 0.1 whole rock conventional K-Ar 21. SG-78 "4.962E-04, 0.581E-04, 1.1167E-04" 1.67 0.0558 27 age of volcanism 11330 1 1.5 0.1 whole rock conventional K-Ar 22. SG-79 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.0278 28 age of volcanism 11331 1 1.7 0.1 whole rock conventional K-Ar 23. SG-80 "4.962E-04, 0.581E-04, 1.1167E-04" 0.74 0.018 32 age of volcanism 11332 1 1.6 0.4 whole rock conventional K-Ar 24. ZION-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.71 0.0168 5 minimum age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11333 1 1.13 0.05 whole rock conventional K-Ar 25. ZION-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.82 0.0296 25 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11334 1 1.4 0.08 whole rock conventional K-Ar 26. ZION-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.04 0.021 22 age of volcanism 11335 1 0.26 0.09 whole rock conventional K-Ar 27. ZION-20 "4.962E-04, 0.581E-04, 1.1167E-04" 2.21 0.0084 6 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11336 1 0.56 0.06 whole rock conventional K-Ar 28. ZION-21 "4.962E-04, 0.581E-04, 1.1167E-04" 1.79 0.0144 13 age of volcanism 11337 1 0.81 0.05 whole rock conventional K-Ar 29. ZION-51 "4.962E-04, 0.581E-04, 1.1167E-04" 1.42 0.0166 17 age of volcanism 11338 1 0.36 0.08 whole rock conventional K-Ar 30. ZION-57 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.005 7 age of volcanism 11339 1 1.2 0.6 whole rock conventional K-Ar 31. ZION-58 "4.962E-04, 0.581E-04, 1.1167E-04" 1.41 0.0244 3 age of volcanism 11340 1 0.87 0.04 whole rock conventional K-Ar 32. ZION-63 "4.962E-04, 0.581E-04, 1.1167E-04" 1.25 0.0157 23 age of volcanism 11341 1 1.1 0.1 whole rock conventional K-Ar 33. ZION-64 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.0158 8 age of volcanism 11342 1 1 0.1 whole rock conventional K-Ar 34. ZION-65 "4.962E-04, 0.581E-04, 1.1167E-04" 1.7 0.0246 15 age of volcanism 11343 1 23.2 0.2 whole rock conventional K-Ar 35. ZION-70 "4.962E-04, 0.581E-04, 1.1167E-04" 3.91 1.3156 72 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11344 1 0.52 0.05 whole rock conventional K-Ar 36. PAN-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.96 0.0147 13 age of volcanism 11345 1 21.1 0.2 whole rock conventional K-Ar 37. PAN-26 "4.962E-04, 0.581E-04, 1.1167E-04" 3.8 1.1619 78 age of volcanism 11346 1 5 0.3 whole rock conventional K-Ar 38. PAN-27 "4.962E-04, 0.581E-04, 1.1167E-04" 1.96 0.1403 22 age of volcanism 11347 1 0.56 0.07 whole rock conventional K-Ar 39. PAN-28 "4.962E-04, 0.581E-04, 1.1167E-04" 2.18 0.0177 11 age of volcanism 11348 1 24.5 0.5 whole rock conventional K-Ar 40. HPL-3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.1 1.452 49 age of volcanism 11349 1 6.5 0.3 whole rock conventional K-Ar 41. HPL-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.57 0.1461 26 age of volcanism 11350 1 5.4 0.4 whole rock conventional K-Ar 42. HPL-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.97 0.1537 15 age of volcanism 11351 1 12.7 0.3 whole rock conventional K-Ar 43. HPL-6 "4.962E-04, 0.581E-04, 1.1167E-04" 2.52 0.4625 46 age of volcanism DAMON(1969 0R 1966) OBTAINED AN AGE OF 12.6 M.Y. FOR WHOLE-ROCK SAMPLE NEAR THIS DATED SAMPLE. 11352 1 9.2 0.4 whole rock conventional K-Ar 44. HPL-11 "4.962E-04, 0.581E-04, 1.1167E-04" 2.54 0.3362 23 age of volcanism 11353 1 7.4 0.7 whole rock conventional K-Ar 45. HPL-12 "4.962E-04, 0.581E-04, 1.1167E-04" 2.46 0.2623 10 age of volcanism 11354 1 0.3 0.1 whole rock conventional K-Ar 46. CVF-182 "4.962E-04, 0.581E-04, 1.1167E-04" 3.01 0.0117 3 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11355 1 1.1 0.3 whole rock conventional K-Ar 47. CVF-500 "4.962E-04, 0.581E-04, 1.1167E-04" 1.72 0.0263 4 age of volcanism 11356 1 1 0.3 whole rock conventional K-Ar 48. CVF-501 "4.962E-04, 0.581E-04, 1.1167E-04" 1.55 0.0214 4 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11357 1 0.5 0.1 whole rock conventional K-Ar 49. CVF-503 "4.962E-04, 0.581E-04, 1.1167E-04" 2.25 0.0155 7 age of volcanism 11358 1 2.5 0.4 whole rock conventional K-Ar 50. CVF-504 "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.023 7 age of volcanism 11359 1 13.3 0.3 whole rock conventional K-Ar 51. WAH-65 "4.962E-04, 0.581E-04, 1.1167E-04" 2.83 0.5422 49 age of volcanism 11360 1 23.2 1 whole rock conventional K-Ar 52. WAH-66 "4.962E-04, 0.581E-04, 1.1167E-04" 3.32 1.1178 23 age of volcanism 11361 1 0.4 0.4 whole rock conventional K-Ar 53. BRD-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.85 0.0049 1 age of volcanism 11362 1 0.18 0.18 whole rock conventional K-Ar 54. BRD-8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.08 0.0028 1 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11363 1 0.16 0.16 whole rock conventional K-Ar 55. BRD-10B "4.962E-04, 0.581E-04, 1.1167E-04" 1 0.0023 1 age of volcanism MATERIAL LEACHED WITH HF AND NITRIC ACID 11364 1 12.3 0.6 whole rock conventional K-Ar 61. C1445-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11365 1 7.9 0.4 whole rock conventional K-Ar 62. C1445-B "4.962E-04, 0.581E-04, 1.1167E-04" 1.79 age of volcanism NO ARGON VALUES GIVEN 11366 1 5.3 0.4 whole rock conventional K-Ar 63. D2251-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.24 age of volcanism NO ARGON VALUES GIVEN 11367 1 1 0.1 whole rock conventional K-Ar 64. D2252-C "4.962E-04, 0.581E-04, 1.1167E-04" 2.28 age of volcanism NO ARGON VALUES GIVEN 11368 1 1.3 0.4 whole rock conventional K-Ar 65. C342-5A "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11369 1 6 0.3 whole rock conventional K-Ar 66. CSV-76-14 "4.962E-04, 0.581E-04, 1.1167E-04" 1.28 0.1105 28 age of volcanism 11370 1 0.3 0.1 whole rock conventional K-Ar 67. SK-66 "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 0.0038 3 age of volcanism 11371 1 6.1 0.5 whole rock conventional K-Ar 68. SK-72 "4.962E-04, 0.581E-04, 1.1167E-04" 2.4 0.2113 14 age of volcanism 11517 1 37.3 0.4 whole rock conventional K-Ar 30-Apr "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11518 1 37.3 0.4 whole rock conventional K-Ar 8-May no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 11519 1 45 biotite conventional K-Ar RB45C "4.962E-04, 0.581E-04, 1.1167E-04" 7.9 5.186 60 THIS AGE IS THE RESULT OF THERMAL EFFECTS ACCOMPANYING EOCENE PLUTONS. 11520 1 57.5 biotite conventional K-Ar RB 68 "4.962E-04, 0.581E-04, 1.1167E-04" 7.37 6.2 55 age of uplift and cooling 11521 1 60.4 biotite conventional K-Ar RB 70 "4.962E-04, 0.581E-04, 1.1167E-04" 6.145 5.438 68 age of uplift and cooling 11522 1 68.5 biotite conventional K-Ar RB 89F "4.962E-04, 0.581E-04, 1.1167E-04" 7.015 7.052 57 age of uplift and cooling 11523 1 65.3 biotite conventional K-Ar RB134 "4.962E-04, 0.581E-04, 1.1167E-04" 8.83 8.459 72 age of uplift and cooling 11524 1 68.6 biotite conventional K-Ar RB148 "4.962E-04, 0.581E-04, 1.1167E-04" 9.215 9.27 72 age of uplift and cooling 11525 1 42.1 biotite conventional K-Ar RB237A "4.962E-04, 0.581E-04, 1.1167E-04" 1.865 1.145 14 THIS AGE IS THE RESULT OF THERMAL EFFECTS ACCOMPANYING EOCENE PLUTONS. 11526 1 62.4 biotite conventional K-Ar RC3A "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 7.367 50 age of uplift and cooling 11527 1 55.1 biotite conventional K-Ar RC13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.322 6.699 35 age of uplift and cooling 11528 1 68 biotite conventional K-Ar RC18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.863 8.838 70 age of uplift and cooling 11529 1 61.5 biotite conventional K-Ar RC39E "4.962E-04, 0.581E-04, 1.1167E-04" 8.095 7.289 63 age of uplift and cooling 11530 1 44.2 biotite conventional K-Ar RH12 "4.962E-04, 0.581E-04, 1.1167E-04" 8.368 5.389 41 age of intrusion 11531 1 40.5 biotite conventional K-Ar RH14A "4.962E-04, 0.581E-04, 1.1167E-04" 9.14 5.393 37 age of uplift and cooling 11532 1 63.2 biotite conventional K-Ar RH29 "4.962E-04, 0.581E-04, 1.1167E-04" 6.86 6.356 29 age of uplift and cooling 11533 1 60.1 biotite conventional K-Ar RH43A "4.962E-04, 0.581E-04, 1.1167E-04" 4.92 4.33 63 age of uplift and cooling 11534 1 65.6 biotite conventional K-Ar RH57 "4.962E-04, 0.581E-04, 1.1167E-04" 8.665 8.336 65 age of uplift and cooling 11535 1 46.1 biotite conventional K-Ar RH85D "4.962E-04, 0.581E-04, 1.1167E-04" 6.81 4.58 42 age of intrusion 11536 1 53.4 biotite conventional K-Ar RH95 "4.962E-04, 0.581E-04, 1.1167E-04" 7.515 5.862 61 age of uplift and cooling 11537 1 53.9 biotite conventional K-Ar RH99 "4.962E-04, 0.581E-04, 1.1167E-04" 4.635 3.653 57 age of uplift and cooling 11538 1 37.2 biotite conventional K-Ar RH115 "4.962E-04, 0.581E-04, 1.1167E-04" 7.08 3.829 24 THIS AGE IS THE RESULT OF THERMAL EFFECTS ACCOMPANYING EOCENE PLUTONS 11539 1 38 biotite conventional K-Ar RH120 "4.962E-04, 0.581E-04, 1.1167E-04" 3.535 1.954 26 age of intrusion 11540 1 63.4 biotite conventional K-Ar RK28A "4.962E-04, 0.581E-04, 1.1167E-04" 7.29 6.769 60 age of uplift and cooling 11541 1 58 biotite conventional K-Ar RK29A "4.962E-04, 0.581E-04, 1.1167E-04" 3.325 2.821 37 age of uplift and cooling 11542 1 44.9 biotite conventional K-Ar RK40 "4.962E-04, 0.581E-04, 1.1167E-04" 8.81 5.771 59 THIS AGE IS THE RESULT OF THERMAL EFFECTS ACCOMPANYING EOCENE PLUTONS. 11543 1 62.6 biotite conventional K-Ar I7 "4.962E-04, 0.581E-04, 1.1167E-04" 8.685 7.962 74 age of uplift and cooling 11544 1 58.6 biotite conventional K-Ar I9 "4.962E-04, 0.581E-04, 1.1167E-04" 7.365 6.314 41 age of uplift and cooling 11545 1 62 biotite conventional K-Ar I14A "4.962E-04, 0.581E-04, 1.1167E-04" 6.363 5.778 62 age of uplift and cooling 11546 1 38.7 biotite conventional K-Ar I22 "4.962E-04, 0.581E-04, 1.1167E-04" 8.646 4.864 76 age of intrusion 11547 1 71.8 biotite conventional K-Ar I24A "4.962E-04, 0.581E-04, 1.1167E-04" 9.005 9.5 42 age of uplift and cooling 11548 1 92.9 biotite conventional K-Ar I32 "4.962E-04, 0.581E-04, 1.1167E-04" 9.369 12.86 70 "minimum age of intrusion, age of uplift and cooling" 11549 1 74.4 biotite conventional K-Ar I-205 "4.962E-04, 0.581E-04, 1.1167E-04" 9.009 9.855 67 age of uplift and cooling 11550 1 69.4 biotite conventional K-Ar I210 "4.962E-04, 0.581E-04, 1.1167E-04" 8.85 9.018 42 age of uplift and cooling 11551 1 72.5 biotite conventional K-Ar I227 "4.962E-04, 0.581E-04, 1.1167E-04" 5.43 5.784 56 age of uplift and cooling 11552 1 76.7 biotite conventional K-Ar H-198 "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 age of uplift and cooling 11563 1 114 biotite conventional K-Ar 11. MA-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11563 2 118 hornblende conventional K-Ar 11. MA-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11588 1 84 biotite conventional K-Ar 36. MP-789 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN THIS IS A REDUCED AGE;ROCK IS PROBABLY 98 M.Y. OLD 11588 2 87 hornblende conventional K-Ar 36. MP-789 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN THIS IS A REDUCED AGE; ROCK US PROBABLY 98 M.Y. OLD 11615 1 52.14 2.1 biotite conventional K-Ar 504 "4.72E-04, 0.585E-04, 1.19E-04*" 2.894 2.204 31 minimum age of intrusion K=2.402%; RAD. 40AR=0.008808 PPM 11615 2 53.68 2.6 hornblende conventional K-Ar 504 "4.72E-04, 0.585E-04, 1.19E-04*" 1.138 0.8927 48 minimum age of intrusion K=0.945%; RAD. 40AR=0.003568 PPM 11616 1 31.74 2.4 biotite conventional K-Ar 638 "4.72E-04, 0.585E-04, 1.19E-04*" 7.87 3.628 4567 age of volcanism "K=6.53, 6.54; RAD. 40AR=0.846, 0.780XE-5 CC/GM" 11617 1 49 Unk conventional K-Ar 526 no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 11618 1 40 Unk conventional K-Ar 566 no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 11619 1 37.3 Unk conventional K-Ar 574 no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 11620 1 37 Unk conventional K-Ar 575 no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 11621 1 8.54 0.8 whole rock conventional K-Ar 593 "4.72E-04, 0.585E-04, 1.19E-04" 0.0768 age of volcanism 20-200 MESH 40K=0.628 PPM; RAD. 40AR=0.000307 PPM 11622 1 58.3 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.584E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11626 1 21.3 1 Unk conventional K-Ar OM-5 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 11627 1 18.7 0.9 Unk conventional K-Ar OM-49 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 11628 1 17.3 0.7 whole rock conventional K-Ar OM-520 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 11629 1 9.31 0.44 whole rock conventional K-Ar U-BF-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11630 1 16.7 0.6 plagioclase conventional K-Ar SH-4 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11631 1 9.7 0.3 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11632 1 19.1 0.8 hornblende conventional K-Ar UB-2-70K "4.72E-04, 0.585E-04, 1.19E-04" 0.1265 27 age of volcanism "(ANALYTICAL ERROR IS PROBABLY 0.8 M.Y., NOT 8.0 M.Y.--COMPILER)" "THIS AGE ALSO REPORTED BY BROOKS, MCINTYRE, AND WALKER, 1976." 11632 2 19 0.6 plagioclase conventional K-Ar UB-2-70K "4.72E-04, 0.585E-04, 1.19E-04" 0.1468 40 age of volcanism "THIS AGE ALSO REPORTED BY BROOKS, MCINTYRE, AND WALKER, 1976." 11633 1 19.8 0.38 plagioclase conventional K-Ar 8-May "4.962E-04, 0.581E-04, 1.1167E-04" 0.872 0.25 81 age of volcanism "THIS AGE WAS FIRST REPORTED BY ROBYN, 1977, PH. D. THESIS, UNIVERSITY OF OREGON." 11633 2 18.1 0.5 plagioclase conventional K-Ar 8-May "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.248 81 minimum age of volcanism "THIS AGE WAS FIRST REPORTED BY ROBYN, 1977, PH. D. THESIS, UNIVERSITY OF OREGON." 11634 1 19.1 0.65 plagioclase conventional K-Ar U-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.468 0.13 57 age of volcanism 11635 1 42.9 5.4 hornblende conventional K-Ar 648-657 "4.962E-04, 0.581E-04, 1.1167E-04" 0.317 0.1983 11 age not evaluated 11636 1 32.1 0.7 plagioclase conventional K-Ar 648-625A "4.962E-04, 0.581E-04, 1.1167E-04" 0.396 0.1849 21 age not evaluated 11637 1 25.8 0.2 K feldspar conventional K-Ar 648-623B "4.962E-04, 0.581E-04, 1.1167E-04" 3.58 1.34 70 age not evaluated 11638 1 13.8 0.8 K feldspar conventional K-Ar 648-644C "4.962E-04, 0.581E-04, 1.1167E-04" 3.89 0.7742 9 age not evaluated 11639 1 146 4.4 hornblende conventional K-Ar MAR-1-67 "4.962E-04, 0.581E-04, 1.1167E-04" 0.228 0.4967 54 age not evaluated 11640 1 22 4 hornblende conventional K-Ar M-4-72 "4.962E-04, 0.581E-04, 1.1167E-04" 0.285 0.0907 9 age not evaluated 11641 1 7.61 0.08 whole rock conventional K-Ar M-6-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.992 0.109 64 age not evaluated 11642 1 7.4 0.8 sanidine conventional K-Ar MO-73-28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.782 0.0832 3 age not evaluated (VERY LOW POTASSIUM CONTENT FOR A SANIDINE CONCENTRATE--COMPILER) 11642 2 6.3 1.1 whole rock conventional K-Ar MO-73-28 "4.962E-04, 0.581E-04, 1.1167E-04" 3.85 0.3487 1 age not evaluated 11643 1 5.22 3.02 plagioclase conventional K-Ar M-6-58 "4.962E-04, 0.581E-04, 1.1167E-04" 0.311 0.0234 1 age not evaluated 11644 1 3.98 1.9 plagioclase conventional K-Ar M-5-41 "4.962E-04, 0.581E-04, 1.1167E-04" 0.768 0.0441 4 age not evaluated 11645 1 3.68 3.3 plagioclase conventional K-Ar M-5-21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.325 0.0173 1 age not evaluated 11646 1 3.14 3 plagioclase conventional K-Ar M-5-25 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5 0.0226 1 age not evaluated 11647 1 2.8 0.4 plagioclase conventional K-Ar M-6-23 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0241 10 age not evaluated 11648 1 2.75 0.49 plagioclase conventional K-Ar M-6-47 "4.962E-04, 0.581E-04, 1.1167E-04" 0.325 0.0129 64 age not evaluated 11649 1 2.6 2.2 plagioclase conventional K-Ar BD-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.303 0.0113 2 age not evaluated 11650 1 2.5 2 plagioclase conventional K-Ar M-5-40 "4.962E-04, 0.581E-04, 1.1167E-04" 0.709 0.0255 2 age not evaluated 11651 1 1.8 0.8 K feldspar conventional K-Ar M-5-18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.986 0.0249 3 age not evaluated (POTASSIUM VALUE IS QUITE LOW FOR A K-FELDSPAR CONCENTRATE--COMPILER) 11652 1 1.63 1.1 plagioclase conventional K-Ar M-6-45 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.0138 2 age not evaluated 11653 1 0.95 0.2 plagioclase conventional K-Ar M-6-64 "4.962E-04, 0.581E-04, 1.1167E-04" 0.818 0.0112 6 age not evaluated 11654 1 0.8 0.23 Unk conventional K-Ar M-6-31 "4.962E-04, 0.581E-04, 1.1167E-04" 3.94 0.0459 5 age not evaluated 11655 1 0.74 0.12 plagioclase conventional K-Ar M-6-44 "4.962E-04, 0.581E-04, 1.1167E-04" 1.201 0.0127 11 age not evaluated 11656 1 0.5 0.25 plagioclase conventional K-Ar M-9-12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.277 0.002 1 age not evaluated 11657 1 0.47 0.06 whole rock conventional K-Ar M-6-80 "4.962E-04, 0.581E-04, 1.1167E-04" 4 0.0271 10 age not evaluated 11658 1 0.41 0.08 whole rock conventional K-Ar M-6-5 "4.962E-04, 0.581E-04, 1.1167E-04" 3.87 0.0227 7 age not evaluated 11659 1 0.4 0.15 K feldspar conventional K-Ar M-6-67 "4.962E-04, 0.581E-04, 1.1167E-04" 3.36 0.0196 1 age not evaluated 11660 1 0.36 0.25 whole rock conventional K-Ar N-1075 "4.962E-04, 0.581E-04, 1.1167E-04" 0.586 0.003 0 age not evaluated 11661 1 0.25 0.09 whole rock conventional K-Ar N-630 "4.962E-04, 0.581E-04, 1.1167E-04" 2.024 0.0074 5 age not evaluated 11662 1 0.2 0.03 whole rock conventional K-Ar M-6-76 "4.962E-04, 0.581E-04, 1.1167E-04" 3.46 0.01 8 age not evaluated 11663 1 0.12 0.01 whole rock conventional K-Ar M-6-36 "4.962E-04, 0.581E-04, 1.1167E-04" 3.64 0.0064 5 age not evaluated 10 11664 1 0.07 0.12 whole rock conventional K-Ar M-6-97 "4.962E-04, 0.581E-04, 1.1167E-04" 4.02 0.0041 1 age not evaluated 11665 1 0.05 0.07 whole rock conventional K-Ar M-6-109 "4.962E-04, 0.581E-04, 1.1167E-04" 1.157 0.0008 0 age not evaluated 11666 1 0.03 0.03 whole rock conventional K-Ar MO-73-30 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0017 0 age not evaluated 11667 1 35 1 biotite conventional K-Ar 760SJ397 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 4.369 91 age not evaluated 11667 2 34.9 1 biotite conventional K-Ar 760SJ397 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 4.349 88 age not evaluated 11668 1 31.2 1 whole rock conventional K-Ar 760SJ395 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3259 15 age not evaluated WHOLE-ROCK WAS ACID TREATED 11669 1 29.4 0.88 whole rock conventional K-Ar 760SJ394 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4008 76 age not evaluated WHOLE-ROCK MATERIAL ACID TREATED 11670 1 21.9 0.7 whole rock conventional K-Ar 760SJ359 "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 83 age not evaluated WHOLE-ROCK MATERIAL ACID TREATED 11671 1 21.4 0.9 plagioclase conventional K-Ar 790SJ034 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0773 36 age not evaluated 11671 2 21.3 0.9 plagioclase conventional K-Ar 790SJ034 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0769 21 age not evaluated 11672 1 51.5 whole rock conventional K-Ar S79-19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.23 0.925 81 age of intrusion 11673 1 6.5 0.5 K feldspar conventional K-Ar KA-1-2 "4.962E-04, 0.581E-04, 1.1167E-04" 42 age not evaluated NO POTASSIUM OR ARGON VALUES GIVEN "THIS AGE ALSO REPORTED BY DAVENPORT, 1970, PH.D. THESIS, OREGON STATE UNIVERSITY, CORVALLIS" 11674 1 5.8 0.4 K feldspar conventional K-Ar KA-147 "4.962E-04, 0.581E-04, 1.1167E-04" 29 age not evaluated NO POTASSIUM OR ARGON VALUES GIVEN "THIS AGE ALSO REPORTED BY DAVENPORT, 1970, PH.D. THESIS, OREGON STATE UNIVERSITY, CORVALLIS" 11675 1 25.7 0.52 plagioclase conventional K-Ar TLR75-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.357 0.5183 63 age not evaluated "THIS AGE ALSO REPORTED BY ROBYN, 1977, PH.D. THESIS, UNIVERSITY OF OREGON, EUGENE" 11676 1 17.3 0.36 glass conventional K-Ar V-23 "4.962E-04, 0.581E-04, 1.1167E-04" 3.417 0.858 92 age not evaluated "THIS AGE ALSO REPORTED BY ROBYN, 1977, PH. D. THESIS, UNIVERSITY OF OREGON, EUGENE" 11677 1 14.9 0.85 plagioclase conventional K-Ar 11-May "4.962E-04, 0.581E-04, 1.1167E-04" 0.192 0.041 32 age not evaluated "THIS AGE ALSO REPORTED BY ROBYN, 1977, PH. D. THESIS, UNIVERSITY OF OREGON, EUGENE" 11678 1 12.4 0.5 plagioclase conventional K-Ar 26-Mar "4.962E-04, 0.581E-04, 1.1167E-04" 1.833 0.3282 59 age not evaluated "THIS AGE ALSO REPORTED BY ROBYN, 1977, PH. D. THESIS, UNIVERSITY OF OREGON, EUGENE" 11679 1 3.1 0.03 plagioclase conventional K-Ar 76-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.194 52 age not evaluated NO ARGON VALUE GIVEN "THIS AGE ALSO REPORTED BY ROBYN, 1977, PH. D. THESIS, UNIVERSITY OF OREGON, EUGENE" 11680 1 41.7 6 Unk conventional K-Ar DX-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.241 0.1462 12 age not evaluated 11681 1 41.2 0.4 whole rock conventional K-Ar B-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.72 1.031 38 age not evaluated 11682 1 16.1 0.3 whole rock conventional K-Ar M-5-7 "4.962E-04, 0.581E-04, 1.1167E-04" 4.37 1.0152 73 age not evaluated 11682 2 15.7 0.3 whole rock conventional K-Ar M-5-7 "4.962E-04, 0.581E-04, 1.1167E-04" 4.36 0.9923 70 age not evaluated 11683 1 10.6 0.7 sanidine conventional K-Ar M-5-9 "4.962E-04, 0.581E-04, 1.1167E-04" 6.47 0.9875 20 age not evaluated 11684 1 9.48 0.3 biotite conventional K-Ar M-5-6 "4.962E-04, 0.581E-04, 1.1167E-04" 7.58 1.0371 45 age not evaluated 11685 1 9.3 0.2 whole rock conventional K-Ar M-5-10 "4.962E-04, 0.581E-04, 1.1167E-04" 4.77 0.6411 62 age not evaluated 11686 1 6.2 1.3 hornblende conventional K-Ar PH-MCB-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.271 0.0138 4 age not evaluated 11687 1 30.8 2 whole rock conventional K-Ar 750SJ235 "4.962E-04, 0.581E-04, 1.1167E-04" 0.167 25 age not evaluated 11688 1 30.2 0.9 whole rock conventional K-Ar 750SJ201 "4.962E-04, 0.581E-04, 1.1167E-04" 0.325 49 age not evaluated 11689 1 29.9 1.5 plagioclase conventional K-Ar 770SJ766 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2139 69 age not evaluated 11690 1 29 0.9 whole rock conventional K-Ar 760SJ356 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5135 83 age not evaluated WHOLE-ROCK MATERIAL ACID TREATED 11691 1 28.6 0.9 plagioclase conventional K-Ar 760SJ355B "4.962E-04, 0.581E-04, 1.1167E-04" 0.134 10 age not evaluated 11692 1 27.8 0.9 whole rock conventional K-Ar 750SJ202 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4518 30 age not evaluated 11693 1 27.4 1 plagioclase conventional K-Ar 750SJ206A "4.962E-04, 0.581E-04, 1.1167E-04" 0.092 16 age not evaluated 11694 1 26 0.8 whole rock conventional K-Ar 750SJ221 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1876 46 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11694 2 26 0.8 whole rock conventional K-Ar 750SJ221 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1875 55 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11695 1 25.9 0.9 whole rock conventional K-Ar 790SJ041 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3732 82 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11696 1 25.9 0.7 plagioclase conventional K-Ar 760SJ317 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0745 14 age not evaluated 11696 2 25.4 0.8 plagioclase conventional K-Ar 760SJ317 "4.962E-04, 0.581E-04, 1.1167E-04" 0.073 13 age not evaluated 11697 1 25.7 1 whole rock conventional K-Ar 760SJ335 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5106 57 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11698 1 25.4 0.8 whole rock conventional K-Ar 790SJ040 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1869 39 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11699 1 25.2 0.8 plagioclase conventional K-Ar 750SJ212 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0999 13 age not evaluated 11700 1 24.6 1 plagioclase conventional K-Ar 750SJ216 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1213 9 age not evaluated 11701 1 24 1 plagioclase conventional K-Ar 750SJ220 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0731 6 age not evaluated 11702 1 22.8 0.8 plagioclase conventional K-Ar 750SJ233 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1402 60 age not evaluated 11703 1 22.7 1 whole rock conventional K-Ar 750SJ226 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2627 42 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11704 1 21.9 1 whole rock conventional K-Ar 750SJ263 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1735 25 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11705 1 20.8 0.6 whole rock conventional K-Ar 760SJ315 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3924 78 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11706 1 20 0.6 whole rock conventional K-Ar 790SJ042 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1492 37 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11707 1 18.2 0.5 whole rock conventional K-Ar 790SJ033 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1603 8 age not evaluated WHOLE-ROCK MATERIAL WAS ACID-TREATED 11708 1 16.8 0.67 plagioclase conventional K-Ar 790SJ90 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0613 6 age not evaluated 11708 2 16.2 0.48 whole rock conventional K-Ar 790SJ90 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0848 7 age not evaluated WHOLE-ROCK MATERIAL TREATED WITH HF AND NITRIC ACID 11709 1 16.4 0.7 plagioclase conventional K-Ar 760SJ361 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0911 19 age not evaluated 11710 1 7.1 0.2 whole rock conventional K-Ar 79BEARN "4.962E-04, 0.581E-04, 1.1167E-04" 0.2522 35 age not evaluated WHOLE-ROCK MATERIAL TREATED WITH NITRIC ACID 11711 1 6.77 0.2 whole rock conventional K-Ar 79BEARF "4.962E-04, 0.581E-04, 1.1167E-04" 0.2327 22 age not evaluated WHOLE-ROCK MATERIAL TREATED WITH HF AND NITRIC ACID 11712 1 4.97 0.15 whole rock conventional K-Ar 80SJ155 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0519 63 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11712 2 5.86 0.41 whole rock conventional K-Ar 80SJ155 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0613 55 WHOLE-ROCK MATERIAL WAS ACID TREATED ANOMOLOUS AGE--TOO OLD 11713 1 4.88 0.15 whole rock conventional K-Ar 760SJ324 "4.962E-04, 0.581E-04, 1.1167E-04" 0.085 39 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11714 1 4.65 0.14 whole rock conventional K-Ar 800SJ158 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0569 19 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11715 1 3.27 0.17 whole rock conventional K-Ar 80SJ170 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0163 15 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11715 2 2.92 0.11 whole rock conventional K-Ar 80SJ170 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0146 19 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11716 1 3.22 1.69 whole rock conventional K-Ar 80SJ160 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0064 10 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11716 2 3.19 0.19 whole rock conventional K-Ar 80SJ160 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0063 9 age not evaluated WHOLE-ROCK MATERIAL ACID TREATED 11717 1 2.95 0.15 whole rock conventional K-Ar 760SJ303 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0109 13 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11718 1 1.69 0.08 whole rock conventional K-Ar 760SJ313 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0152 15 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11719 1 1.25 0.11 whole rock conventional K-Ar 80SJ159 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0022 1 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11720 1 0.83 0.06 whole rock conventional K-Ar 760SJ306 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0088 7 age not evaluated WHOLE-ROCK MATERIAL WAS ACID TREATED 11721 1 30.9 plagioclase conventional K-Ar PTR-71-5A "4.962E-04, 0.581E-04, 1.1167E-04" 1.6737 66 age not evaluated 11722 1 30.8 0.5 whole rock conventional K-Ar 10-6-78-2 "4.962E-04, 0.581E-04, 1.1167E-04" 2.156 0.9654 70 age not evaluated 11723 1 30.5 sanidine conventional K-Ar PYT-71-10 "4.962E-04, 0.581E-04, 1.1167E-04" 6.86 3.038 75 age not evaluated 11724 1 28.6 0.5 K feldspar conventional K-Ar 648-584 "4.962E-04, 0.581E-04, 1.1167E-04" 5.43 2.256 46 age not evaluated 11725 1 28.1 0.5 K feldspar conventional K-Ar 648-34B "4.962E-04, 0.581E-04, 1.1167E-04" 6.02 2.457 46 age not evaluated 11726 1 27.7 0.25 Unk conventional K-Ar PTR-71-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.399 0.5615 47 age not evaluated 11727 1 23.4 3.3 plagioclase conventional K-Ar ROB-TUFF-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.589 0.1993 12 age not evaluated 11728 1 22.7 2.7 plagioclase conventional K-Ar ROB-TUF-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.396 0.13 14 age not evaluated 11729 1 151 4.5 muscovite conventional K-Ar PP-2-67 "4.962E-04, 0.581E-04, 1.1167E-04" 9.78 22.21 91 age not evaluated 11730 1 2.3 0.2 whole rock conventional K-Ar KFW-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.234 0.0407 7 age not evaluated "THIS AGE REPORTED BY O'BRIEN AND BENSON, 1981 OR 1982" 11731 1 1.9 0.5 whole rock conventional K-Ar KFE-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.0131 2 age not evaluated "THIS AGE REPORTED BY O'BRIEN AND BENSON, 1981 OR 1982" 11732 1 5.8 4 plagioclase conventional K-Ar M-5-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.32 0.0266 1 age not evaluated 11733 1 0.23 0.01 plagioclase conventional K-Ar M-5-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.544 0.0005 22 age not evaluated 11734 1 6.03 0.8 whole rock conventional K-Ar 760SJ340 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0703 24 age not evaluated WHOLE-ROCK MATERIAL ACID-TREATED 11735 1 3.62 0.19 whole rock conventional K-Ar 750SJ270 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0642 22 age not evaluated WHOLE-ROCK MATERIAL WAS ACID-TREATED 11736 1 3.33 0.66 whole rock conventional K-Ar 750SJ275 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0079 22 age not evaluated WHOLE-ROCK MATERIAL WAS ACID-TREATED 11737 1 1.17 0.12 whole rock conventional K-Ar 750SJ283 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0094 11 age not evaluated WHOLE-ROCK MATERIAL WAS ACID-TREATED 11738 1 0.92 0.09 whole rock conventional K-Ar 750SJ273 "4.962E-04, 0.581E-04, 1.1167E-04" 0.016 40 age not evaluated WHOLE-ROCK MATERIAL WAS ACID-TREATED 11738 2 0.92 0.03 whole rock conventional K-Ar 750SJ273 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0159 5 age not evaluated WHOLE-ROCK MATERIAL WAS ACID-TREATED 11739 1 29.3 5 plagioclase conventional K-Ar M-5-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.352 0.1495 9 age not evaluated 11740 1 27.2 0.7 K feldspar conventional K-Ar M5-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.85 0.7291 54 age not evaluated 11741 1 4.7 2 plagioclase conventional K-Ar M-4-53 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.0399 4 age not evaluated 11742 1 0.46 0.46 whole rock conventional K-Ar 3S-33(G) "4.962E-04, 0.581E-04, 1.1167E-04" 0.615 0.0041 1 age not evaluated 11743 1 30.3 0.9 whole rock conventional K-Ar SKINNER F "4.962E-04, 0.581E-04, 1.1167E-04" 0.0876 56 age not evaluated WHOLE-ROCK MATERIAL TREATED WITH HF AND NITRIC ACID 11744 1 29.4 0.9 whole rock conventional K-Ar SKINNER F "4.962E-04, 0.581E-04, 1.1167E-04" 0.1846 53 age not evaluated WHOLE-ROCK MATERIAL TREATED WITH NITRIC ACID 11745 1 14.2 2 whole rock conventional K-Ar 3S-46(G) "4.962E-04, 0.581E-04, 1.1167E-04" 1.043 0.2144 17 age not evaluated 11746 1 8.6 7 whole rock conventional K-Ar 3S-44(G) "4.962E-04, 0.581E-04, 1.1167E-04" 0.083 0.0103 3 age not evaluated 11747 1 1.55 0.02 whole rock conventional K-Ar 3S-47(G) "4.962E-04, 0.581E-04, 1.1167E-04" 0.047 0.0011 0 age not evaluated 11748 1 36.6 3.6 plagioclase conventional K-Ar SR-64-178 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.124 3 age not evaluated "THIS AGE REPORTED BY SNAVELY AND MACLEOD, 1974" 11749 1 31.8 10 whole rock S79-6 "4.962E-04, 0.581E-04, 1.1167E-04" 4.06 1.87 71 age not evaluated 11750 1 16.5 0.6 sanidine conventional K-Ar 1703 "4.962E-04, 0.581E-04, 1.1167E-04" 6.17 1.474 54 age not evaluated 11751 1 11.1 0.5 sanidine conventional K-Ar 1654 "4.962E-04, 0.581E-04, 1.1167E-04" 7.72 1.242 37 age not evaluated 11752 1 11.3 0.5 sanidine conventional K-Ar M-5-8 "4.962E-04, 0.581E-04, 1.1167E-04" 7.76 1.2704 41 age not evaluated 11753 1 13.3 1.5 whole rock conventional K-Ar OG-2-70 "4.962E-04, 0.581E-04, 1.1167E-04" 0.656 0.1259 12 age not evaluated 11754 1 13.8 2.5 Unk conventional K-Ar F-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0458 8 age not evaluated 11755 1 11.6 0.6 Unk conventional K-Ar L-44 "4.962E-04, 0.581E-04, 1.1167E-04" 0.325 0.0544 10 age not evaluated 11756 1 11.5 2.9 Unk conventional K-Ar MM-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.324 0.0537 6 age not evaluated 11757 1 9.5 1.8 Unk conventional K-Ar D-8 "4.962E-04, 0.581E-04, 1.1167E-04" 2.03 0.2784 8 age not evaluated 11758 1 17.3 0.5 whole rock conventional K-Ar I-74 "4.962E-04, 0.581E-04, 1.1167E-04" 1.738 0.4358 48 age not evaluated 11759 1 16 1 whole rock conventional K-Ar DB-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.735 0.1695 20 age not evaluated 11760 1 13.9 2.5 whole rock conventional K-Ar DB-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.69 0.1382 16 age not evaluated 11761 1 12.6 1.5 whole rock conventional K-Ar DB-20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.974 0.1768 20 age not evaluated 11762 1 5.3 4.5 whole rock conventional K-Ar DB-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.466 0.0356 2 age not evaluated 11763 1 27 0.3 K feldspar conventional K-Ar 648-552 "4.962E-04, 0.581E-04, 1.1167E-04" 7.48 2.925 67 age not evaluated 11764 1 57 plagioclase conventional K-Ar PTR-71-9A "4.962E-04, 0.581E-04, 1.1167E-04" 0.4229 63 age not evaluated AGE APPEARS TO BE TOO OLD 11765 1 48.9 5.2 hornblende conventional K-Ar E-16-77 "4.962E-04, 0.581E-04, 1.1167E-04" 0.256 0.1826 10 age not evaluated 11766 1 47 9.5 hornblende conventional K-Ar 648-695 "4.962E-04, 0.581E-04, 1.1167E-04" 0.359 0.246 7 age not evaluated 11767 1 26.94 0.23 plagioclase conventional K-Ar PTR-71-11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.44 0.5628 52 age not evaluated 11768 1 26.8 0.4 K feldspar conventional K-Ar 648-456 "4.962E-04, 0.581E-04, 1.1167E-04" 7.42 2.879 60 age not evaluated 11769 1 41.24 4 hornblende conventional K-Ar DP-154 "4.72E-04, 0.585E-04, 1.19E-04*" 0.363 0.218 17 age of volcanism 11770 1 14.3 2 plagioclase conventional K-Ar DP-108 "4.72E-04, 0.585E-04, 1.19E-04" 0.189 16 age of volcanism 11771 1 16 0.4 K feldspar conventional K-Ar GWW-33-77 "4.962E-04, 0.581E-04, 1.1167E-04" 6.05 1.4028 63 age of volcanism ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596 11772 1 15.1 0.8 whole rock conventional K-Ar 39-78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.741 0.1619 31 age of volcanism ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596 11773 1 10.5 0.3 whole rock conventional K-Ar Sep-74 "4.962E-04, 0.581E-04, 1.1167E-04" 2.78 0.422 52 age of volcanism ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596 11774 1 8.5 1.3 whole rock conventional K-Ar Jun-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.126 0.0155 6 age of volcanism ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596 11775 1 7 0.4 whole rock conventional K-Ar 69-78 "4.962E-04, 0.581E-04, 1.1167E-04" 5.44 0.5533 34 age of volcanism ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596 11776 1 6.8 0.9 whole rock conventional K-Ar PRP-2-70 "4.962E-04, 0.581E-04, 1.1167E-04" 0.471 0.0472 13 age of volcanism ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596 11777 1 46 0.9 whole rock conventional K-Ar YO27 "4.962E-04, 0.581E-04, 1.1167E-04" 0.913 0.6102 50 age of volcanism FLOW PROBABLY OCCURRED ABOUT 46 M.Y. AGO 11778 1 45.8 0.5 whole rock conventional K-Ar YO51 "4.962E-04, 0.581E-04, 1.1167E-04" 0.831 0.5529 48 age of volcanism FLOW PROBABLY OCCURRED ABOUT 46 M.Y. AGO 11778 2 43.2 0.6 whole rock conventional K-Ar YO51 "4.962E-04, 0.581E-04, 1.1167E-04" 0.831 0.521 31 minimum age of volcanism FLOW PROBABLY OCCURRED ABOUT 46 M.Y. AGO 11779 1 42.7 0.5 whole rock conventional K-Ar Y106 "4.962E-04, 0.581E-04, 1.1167E-04" 1.546 0.9572 47 minimum age of volcanism FLOW PROBABLY OCCURRED ABOUT 46 M.Y. AGO 11780 1 43.9 0.5 whole rock conventional K-Ar D78-T-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.11 0.7078 52 minimum age of volcanism FLOW PROBABLY OCCURRED ABOUT 46 M.Y. AGO 11781 1 45.7 0.5 whole rock conventional K-Ar D78-T-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.566 0.3761 48 age of volcanism FLOW IS PROBABLY 46 M.Y. OLD 11782 1 42.7 0.4 whole rock conventional K-Ar D78-T-14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.953 0.5913 68 minimum age of volcanism DIKE MAY BE ABOUT 46 M.Y. OLD 11783 1 6.42 0.13 anorthoclase conventional K-Ar E-3-65 no decay constants given 0.4306 56 age of volcanism "K=3.76, 3.75%; 40AR-RAD=0.965XE-6 CC/GM" 11784 1 5.98 0.5 anorthoclase conventional K-Ar E-71-67 "4.72E-04, 0.584E-04, 1.19E-04*" 4.612 0.3975 "K=3.749, 3.908%; RAD. 40AR=0.00157, 0.00161 PPM" AGE IS PROBABLY AROUND 6.5 M.Y. 11785 1 6.56 0.23 anorthoclase conventional K-Ar E-84-67 no decay constants given 0.5181 29 age of volcanism "K=4.41, 4.43%; 40AR-RAD=1.61XE-6 CC/GM" 11786 1 6.41 0.22 anorthoclase conventional K-Ar E-6-70 no decay constants given 0.4395 28 age of volcanism "K=3.85, 3.83%; 40AR-RAD=0.985XE-6 CC/GM" 11787 1 53.7 1 plagioclase conventional K-Ar 648-628 "4.962E-04, 0.581E-04, 1.1167E-04" 0.264 0.2071 24 age not evaluated 11788 1 16.34 0.3 sanidine conventional K-Ar 1649 "4.72E-04, 0.584E-04, 1.19E-04*" 7.67 1.812 68 age of volcanism "ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 28" 11789 1 16.15 0.3 sanidine conventional K-Ar 167 "4.72E-04, 0.585E-04, 1.19E-04*" 6.5 1.518 76 age of volcanism "ANALYTICAL DATA TAKEN FROM USGS OPEN-FILE REPORT 82-596, P. 28, ENTRY 29" 11790 1 17.5 2 plagioclase conventional K-Ar 1105 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11791 1 21.8 3 plagioclase conventional K-Ar 1101 "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN ROCK IS PROBABLY 18 M.Y. OLD 11792 1 20.1 5 plagioclase conventional K-Ar 1238 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11793 1 19.6 1.3 plagioclase conventional K-Ar 1031 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11794 1 23.3 10 plagioclase conventional K-Ar 1038 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN; VERY HIGH UNCERTAINITY FOR CALCULATED AGE 11795 1 18.8 2.5 plagioclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11796 1 17.5 2 plagioclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11797 1 16.4 1.2 plagioclase conventional K-Ar 1234 "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) NO ANALYTICAL DATA GIVEN 11798 1 13.7 2 plagioclase conventional K-Ar RDM "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 11799 1 16.9 0.6 plagioclase conventional K-Ar TLM "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) NO ANALYTICAL DATA GIVEN 11800 1 16.5 0.4 K feldspar conventional K-Ar TRH "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) NO ANALYTICAL DATA GIVEN 11801 1 15.6 0.3 K feldspar conventional K-Ar 1179 "4.72E-04, 0.585E-04, 1.19E-04" age meaning uncertain (geologic factors) NO ANALYTICAL DATA GIVEN 11802 1 183 8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 2.413 92 minimum age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 11803 1 164 3 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 2.103 66 "NO ANALYTICAL DATA PUBLISHED; ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS; POTASSIUM VALUES DETERMINED BY ISOTOPE DILUTION" CORE FROM 485.7 M IN SAME BOREHOLE GAVE A DATE OF 183 M.Y.--A MINIMUM AGE 11804 1 25.4 0.5 whole rock conventional K-Ar DMS-133 no decay constants given* 0.274 0.1009 13 age of volcanism "K20=0.276, 0.273, 0.269% (ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596)" "THIS AGE ALSO LISTED BY SUTTER, 1978" 11805 1 29.86 0.34 whole rock conventional K-Ar MS-270 no decay constants given* 1.017 0.4408 32 age of volcanism "K20=1.028, 1.005% (ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596)" "THIS AGE ALSO REPORTED BY SUTTER, 1978" 11806 1 29.5 0.34 whole rock conventional K-Ar DMS-144 no decay constants given* 0.864 0.3697 30 age of volcanism "K20=0.868, 0.859% (ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596)" "THIS AGE ALSO REPORTED BY SUTTER, 1978" 11807 1 34.3 0.46 Unk conventional K-Ar M-343 no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 11808 1 21.91 0.55 whole rock conventional K-Ar CP-173 no decay constants given* 0.419 0.133 29 age of volcanism ANALYTICAL DATA FROM USGS OPEN-FILE REPORT 82-596 "THIS AGE ALSO REPORTED BY SUTTER, 1978" 11809 1 29.9 1.4 whole rock conventional K-Ar AWL-1-80 "4.72E-04, 0.585E-04, 1.19E-04" 1.03 4754 age of intrusion "K=1.924, 1.908%; 40AR-RAD=0.004107, 0.004125 PPM (ANALYTICAL DATA SUPPLIED BY A.W. LAUGHLIN)" 11810 1 27.3 1.3 whole rock conventional K-Ar AWL-5-80 "4.72E-04, 0.585E-04, 1.19E-04" 0.9442 6469 minimum age of intrusion "K=1.914, 1.931%; 40AR-RAD=0.003745, 0.003802 PPM (ANALYTICAL DATA SUPPLIED BY A.W. LAUGHLIN)" 11812 1 35.6 0.7 sanidine conventional K-Ar 2. 76T5 "4.962E-04, 0.581E-04, 1.1167E-04" 3.845 969697 age of volcanism "40AR-RAD=3.829, 3.836, 3.869XE-10 MOL/GM" 11816 1 32.1 0.7 sanidine conventional K-Ar 6. 76T3 "4.962E-04, 0.581E-04, 1.1167E-04" 3.778 8484 age of volcanism "40AR-RAD=3.761, 3.794XE-10 MOL/GM" 11820 1 28 0.6 sanidine conventional K-Ar 10. 76T4 "4.962E-04, 0.581E-04, 1.1167E-04" 2.544 838283 "40AR-RAD=2.548, 2.544, 2.541XE-10 MOL/GM" THIS DATE IS APPARENTLY TOO YOUNG 11822 1 24.3 0.6 whole rock conventional K-Ar 12. 76T2 "4.962E-04, 0.581E-04, 1.1167E-04" 2.366 8384 age of volcanism "40AR-RAD=2.357, 2.375XE-10 MOL/GM" 11823 1 146 1 biotite conventional K-Ar 117 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 19.5 93 age of intrusion 11824 1 129 4 hornblende conventional K-Ar 155 "4.962E-04, 0.581E-04, 1.1167E-04" 1.642 84 THIS DATE DOES NOT APPEAR TO BE A PRIMARY DATE; ROCK IS PROBABLY JURASSIC IN AGE 11825 1 112 3 hornblende conventional K-Ar MLB-17A "4.962E-04, 0.581E-04, 1.1167E-04" 0.9164 66 "THIS DATE REPRESENTS THE TIME OF DEFORMATION, AND POSSIBLY THE TIME OF INTRUSION" 11825 2 101 3 biotite conventional K-Ar MLB-17A "4.962E-04, 0.581E-04, 1.1167E-04" 13.97 67 THIS DATE IS EITHER A COOLING DATE OR A HYBRID DATE 11826 1 114 3 hornblende conventional K-Ar MLB-17B "4.962E-04, 0.581E-04, 1.1167E-04" 0.822 64 "THIS DATE REPRESENTS THE TIME OF DEFORMATION, AND POSSIBLY THE TIME OF INTRUSION" 11826 2 102 3 biotite conventional K-Ar MLB-17B "4.962E-04, 0.581E-04, 1.1167E-04" 13.86 91 THIS DATE IS EITHER A COOLING DATE OR A HYBRID DATE 11833 1 72.45 3.1 sanidine conventional K-Ar 1. JKR-54A "4.72E-04, 0.585E-04, 1.19E-04*" 3.812 4.057 8276 PROBABLY IMPURE SANIDINE CONCENTRATE "K=3.145, 3.184%; 40AR-RAD=0.01553, 0.01690 PPM" "SANIDINE-BIOTITE PAIR GIVE AN AVERAGE AGE OF 72.3 M.Y. THE 78.0 M.Y. AGE REPORTED BY BROOKINS AND RIGBY (ISOCHRON/WEST, APRIL, 1982) FOR THIS CONCENTRATE IS SUPERSEDED BY THIS REVISED AGE" 11833 2 76.21 2.8 biotite conventional K-Ar 2. JKR-54B "4.72E-04, 0.585E-04, 1.19E-04*" 7.69 8.618 7878 "K=6.450, 6.317%; 40AR-RAD=0.03437, 0.03452 PPM" "SANIDINE-BIOTITE PAIR GIVE AN AVERAGE AGE OF 72.3 M.Y. THE 69.0 M.Y. AGE REPORTED BY BROOKINS AND RIGBY (ISOCHRON/WEST, APRIL, 1982) FOR THIS CONCENTRATE IS SUPERSEDED BY THIS REVISED AGE" 11834 1 73.26 2.7 biotite conventional K-Ar 3. JKR-54C "4.72E-04, 0.585E-04, 1.19E-04*" 7.369 7.932 7577 "K=6.168, 6.066%; 40AR-RAD=0.03259, 0.03082 PPM" "SANIDINE-BIOTITE PAIR GIVE AN AVERAGE AGE OF 71.8 M.Y. THE 68.0 M.Y. AGE REPORTED BY BROOKINS AND RIGBY (ISOCHRON/WEST, AUGUST, 1982) FOR THIS CONCENTRATE IS SUPERSEDED BY THIS REVISED AGE" 11834 2 74.44 2.6 sanidine conventional K-Ar 4. JKR-54D "4.72E-04, 0.585E-04, 1.19E-04*" 12.12 13.26 8784 "K=10.227, 9.896%; 40AR-RAD=0.05240, 0.05359 PPM" "SANIDINE-BIOTITE PAIR GIVE AN AVERAGE AGE OF 71.8 M.Y. THE 67.2 M.Y. AGE REPORTED BY BROOKINS AND RIGBY (ISOCHRON/WEST, AUGUST, 1982) FOR THIS CONCENTRATE IS SUPERSEDED BY THIS REVISED AGE" 11835 1 75.07 2.7 sanidine conventional K-Ar 5. JKR-62A "4.72E-04, 0.585E-04, 1.19E-04*" 11.29 12.46 9692 age of volcanism "K=9.269, 9.474%; 40AR-RAD=0.05004, 0.04960 PPM" "THE 64.7 M.Y. AGE REPORTED BY BROOKINS AND RIGBY (ISOCHRON/WEST, AUGUST, 1982) FOR THIS CONCENTRATE IS SUPERSEDED BY THIS REVISED AGE" 11836 1 69.88 2.5 sanidine conventional K-Ar 6. JKR-93A "4.72E-04, 0.585E-04, 1.19E-04*" 11.25 11.54 8287 minimum age of volcanism "K=9.472, 9.204; 40AR-RAD=0.04627, 0.04596 PPM" "THE 64.5 M.Y. AGE REPORTED BY BROOKINS AND RIGBY (ISOCHRON/WEST, AUGUST, 1982) FOR THIS CONCENTRATE IS SUPERSEDED BY THIS REVISED AGE" 11837 1 43.5 1.8 whole rock conventional K-Ar VCK-82-TX-028 "4.962E-04, 0.581E-04, 1.1167E-04" 3.796 2.41 79 age of intrusion K=3.151%; 40AR-RAD=0.009634 PPM 11838 1 47.2 2 whole rock conventional K-Ar VCK-82-TX-029 "4.962E-04, 0.581E-04, 1.1167E-04" 2.412 1.663 83 age of intrusion K=2.002%; 40AR-RAD=0.006648 PPM 11839 1 36.8 1.7 whole rock conventional K-Ar VCK-82-TX-030 "4.962E-04, 0.581E-04, 1.1167E-04" 1.925 1.033 70 age of intrusion K=1.598%; 40AR-RAD=0.004130 PPM 11840 1 33.4 1.4 whole rock conventional K-Ar VCK-82-TX-031 "4.962E-04, 0.581E-04, 1.1167E-04" 3.797 1.849 81 age of intrusion K=3.152%; 40AR-RAD=0.007389 PPM 11843 1 57.4 1.3 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.477 1.245 87 minimum age of metamorphic crystallization K=1.226% 11844 1 52.3 1.4 biotite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 7.069 5.394 5960 age of uplift and cooling "K=5.868%; 40AR-RAD=536.4, 542.4XE-12 MOL/GM" 11845 1 9.6 0.3 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.601 0.2212 31303032 age of volcanism "K=1.329%; 40AR-RAD=21.7, 22.0, 22.3, 22.5XE-12 MOL/GM" 11846 1 16.2 0.4 whole rock (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.355 0.184 6868 age of volcanism K=1.125% 11847 1 233.1 13.7 hornblende 39Ar-40Ar incremental (plateau) MONZONITE HORNBLENDE "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion TOTAL 40/39 GAS AGE FOR HORNBLENDE IS 179.9 M.Y.; NO AGE PLATEAU OBTAINED; SEE ARTICLE FOR ANALYTICAL DATA ROCK'S ISOTOPIC K-AR SYSTEM HAS BEEN DISTURBED 11847 2 76.59 1.24 biotite 39Ar-40Ar incremental (plateau) MONZONITE BIOTITE "4.962E-04, 0.581E-04, 1.1167E-04" age of later metamorphism 40/39 PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA 11848 1 119.2 3.4 hornblende 39Ar-40Ar incremental (plateau) GABBRO-HORNBLENDE "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion DISTURBED 40/39 AGE SPECTRUM; SEE ARTICLE FOR ANALYTICAL DATA; NO 40/39 PLATEAU OBTAINED 11849 1 73.16 1.11 biotite 39Ar-40Ar incremental (plateau) VIGR BIOTITE "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion A 40/39 PLATEAU AGE 11850 1 175 6 muscovite conventional K-Ar 238A "4.962E-04, 0.581E-04, 1.1167E-04" 5.46 14.44 68 age of metamorphic crystallization MUSCOVITE PLUS CHLORITE AND QUARTZ 11851 1 190 8 whole rock conventional K-Ar 323 "4.962E-04, 0.581E-04, 1.1167E-04" 1.61 4.654 80 THIS DATE MAY BE A MINIMUM AGE FOR THE HIGH-GRADE METAMORPHIC EVENT BUT MORE DATES ARE NEEDED 11852 1 173 8 muscovite conventional K-Ar 324 "4.962E-04, 0.581E-04, 1.1167E-04" 6.6 17.29 83 age of metamorphic crystallization MUSCOVITE WITH SOME QUARTZ 11853 1 176 9 whole rock conventional K-Ar 327 "4.962E-04, 0.581E-04, 1.1167E-04" 3.18 8.447 93 age of metamorphic crystallization 11853 2 157 5 muscovite conventional K-Ar 327 "4.962E-04, 0.581E-04, 1.1167E-04" 3.32 7.84 76 age not evaluated MUSCOVITE-CHLORITE-QUARTZ MIXTURE 11862 1 9.4 0.5 alunite conventional K-Ar M256 "4.962E-04, 0.581E-04, 1.1167E-04" 1.234 49 TIME OF MINERALIZATION 11863 1 9.18 0.33 alunite conventional K-Ar 79-S-10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.042 67 TIME OF MINERALIZATION 11864 1 148.3 2 hornblende 39Ar-40Ar incremental (plateau) G-269A "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR PLATEAU AGE 11865 1 122.2 hornblende 39Ar-40Ar total fusion G-386A "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE QUARTZ DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11866 1 105.5 hornblende 39Ar-40Ar total fusion PR-183 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11866 2 76.72 biotite 39Ar-40Ar total fusion PR-183 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL FUSION DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11867 1 97.1 1.7 hornblende 39Ar-40Ar incremental (plateau) LM-232 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR PLATEAU AGE QUARTZ DIORITE IS PROBABLY 150 M.Y. OLD 11867 2 77.17 biotite 39Ar-40Ar total fusion LM-232 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE QUARTZ DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11868 1 110.8 hornblende 39Ar-40Ar total fusion G-401 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE TONALITE IS PROBABLY ABOUT 150 M.Y. OLD 11868 2 77.67 biotite 39Ar-40Ar total fusion G-401 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE TONALITE IS PROBABLY ABOUT 150 M.Y. OLD 11869 1 100 1.6 hornblende 39Ar-40Ar incremental (plateau) PR-181 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR PLATEAU AGE DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11869 2 75.6 biotite 39Ar-40Ar total fusion PR-181 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11870 1 110.8 hornblende 39Ar-40Ar total fusion PR-182 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11870 2 76.1 hornblende 39Ar-40Ar total fusion PR-182 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE DIORITE IS PROBABLY ABOUT 150 M.Y. OLD 11871 1 76.83 biotite 39Ar-40Ar total fusion G-269B "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE 11872 1 76.05 0.97 biotite 39Ar-40Ar total fusion G-386 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR PLATEAU AGE TONALITE IS PROBABLY ABOUT 150 M.Y. OLD 11873 1 75.58 biotite 39Ar-40Ar total fusion G-397 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE TONALITE IS PROBABLY ABOUT 150 M.Y. OLD 11874 1 73.08 biotite 39Ar-40Ar total fusion G-398 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE 11875 1 76.4 muscovite 39Ar-40Ar incremental (plateau) G-400 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR PLATEAU AGE 11876 1 79.87 biotite 39Ar-40Ar total fusion PR-180 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE 11877 1 78.78 biotite 39Ar-40Ar total fusion LM-231A "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA FOR TOTAL-GAS AGE 11893 1 41.5 2.5 hornblende conventional K-Ar 75-207 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 11895 1 85.3 1.8 hornblende conventional K-Ar 2. RWT-55-76 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 11900 1 46.4 0.4 whole rock conventional K-Ar 7. RWT-400-76 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 100-200 MESH FRACTION NO ANALYTICAL DATA GIVEN 11900 2 46.9 0.6 whole rock conventional K-Ar 7. RWT-400-76 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion "60-100 MESH FRACTION, ACID TREATED" NO ANALYTICAL DATA GIVEN 11901 1 47.1 2.8 whole rock conventional K-Ar 8. KA-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11902 1 46.3 0.3 biotite conventional K-Ar 9. RWT-66-77 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 11905 1 43.2 0.4 biotite conventional K-Ar 12. VF-77-184 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11906 1 42.5 1.6 biotite conventional K-Ar 13. KA-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11910 1 32.2 0.4 whole rock conventional K-Ar 17. RWT-435-76 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism -60 MESH MATERIAL NO ANALYTICAL DATA GIVEN 11911 1 32.1 0.7 whole rock conventional K-Ar 18. RWT-349-76 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion -60 MESH MATERIAL NO ANALYTICAL DATA GIVEN 11915 1 25.1 0.3 hornblende conventional K-Ar 25. RWT-318-76 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11916 1 29.8 6.6 hornblende conventional K-Ar 26. RWT-316-76 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11917 1 30.2 2.1 hornblende conventional K-Ar 27. KA-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11918 1 29.7 3.2 hornblende conventional K-Ar 28. KA-2 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 11919 1 35.1 3.2 hornblende conventional K-Ar 29. KA-3 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 11920 1 4.5 0.7 hornblende conventional K-Ar 32. RBW-77.988 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN "THIS AGE REPORTED BY WAITT, 1979, AS 4.4+/-0.7 M.Y." 11944 1 9.3 0.87 hornblende conventional K-Ar OMF-7A-3750/UT-224 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0309 15 age not evaluated 11945 1 12.1 1.7 whole rock conventional K-Ar MH-20/UT-228 "4.962E-04, 0.581E-04, 1.1167E-04" 2.28 0.3983 10 age not evaluated 11946 1 10.7 0.5 whole rock conventional K-Ar LCM/UT-240 "4.962E-04, 0.581E-04, 1.1167E-04" 0.965 0.1495 32 age not evaluated 11947 1 10.5 0.4 whole rock conventional K-Ar LCM/AH-48 "4.962E-04, 0.581E-04, 1.1167E-04" 0.965 0.146 48 age not evaluated 11948 1 10.6 0.5 whole rock conventional K-Ar MH-10/UT-227 "4.962E-04, 0.581E-04, 1.1167E-04" 0.955 0.1469 36 age not evaluated 11949 1 9.54 2.4 whole rock conventional K-Ar MH-19/AH-47 "4.72E-04, 0.585E-04, 1.19E-04*" 0.944 0.13 5 age not evaluated 11950 1 9.3 0.87 hornblende conventional K-Ar OMF-7A-3750/UT-224 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0309 15 age not evaluated 11951 1 30.1 1.1 whole rock conventional K-Ar DOGMI-BAS81-2/UT-225 "4.962E-04, 0.581E-04, 1.1167E-04" 1.181 0.5153 59 age not evaluated 11952 1 28.3 1 anorthoclase conventional K-Ar PB-5/AH-34 "4.962E-04, 0.581E-04, 1.1167E-04" 5.29 2.1718 68 age not evaluated 11953 1 8.83 1.36 plagioclase conventional K-Ar PB-1/UT-216 "4.962E-04, 0.581E-04, 1.1167E-04" 0.151 0.0192 9 age not evaluated 11954 1 5.95 2.08 whole rock conventional K-Ar PB-2/UT-210 "4.962E-04, 0.581E-04, 1.1167E-04" 0.356 0.0305 4 age not evaluated 11955 1 1.53 0.77 whole rock conventional K-Ar DOGMI-BAS81-1/UT-226 "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.0141 3 age not evaluated 11956 1 11.2 0.5 whole rock conventional K-Ar SH-105/UT-204 "4.962E-04, 0.581E-04, 1.1167E-04" 4.325 0.7025 37 age not evaluated 11957 1 11 1.3 whole rock conventional K-Ar SH-106/UT-194 "4.962E-04, 0.581E-04, 1.1167E-04" 0.605 0.0959 11 age not evaluated 11958 1 9.37 0.8 whole rock conventional K-Ar SH-106A(100)/AH-19 "4.962E-04, 0.581E-04, 1.1167E-04" 0.779 0.1054 16 age not evaluated 11959 1 8.01 0.68 whole rock conventional K-Ar SH-113/AH-15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.895 0.1035 16 age not evaluated 11960 1 2.45 0.72 whole rock conventional K-Ar SH-12/UT-209 "4.962E-04, 0.581E-04, 1.1167E-04" 0.32 0.0113 5 age not evaluated 11961 1 15.4 0.6 anorthoclase conventional K-Ar SH-111/UT-214 "4.962E-04, 0.581E-04, 1.1167E-04" 2.83 0.6316 50 age not evaluated 11962 1 13.9 0.9 anorthoclase conventional K-Ar SH-113/AH-35 "4.962E-04, 0.581E-04, 1.1167E-04" 3.16 0.6357 23 age not evaluated 11963 1 16.2 1.8 whole rock conventional K-Ar COUGAR DAM EAST/UT-193 "4.962E-04, 0.581E-04, 1.1167E-04" 0.286 0.0669 13 age not evaluated 11964 1 13.8 0.8 plagioclase conventional K-Ar RI-85/AH-17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.421 0.0838 26 age not evaluated 11965 1 11.4 0.5 plagioclase conventional K-Ar RI-112/AH-14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.251 0.0414 35 age not evaluated 11966 1 8.8 0.34 whole rock conventional K-Ar TMW-TOP/AH-18 "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 0.1726 61 age not evaluated 11967 1 8.34 0.36 whole rock conventional K-Ar TPB/UT-198 "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.0529 39 age not evaluated 11968 1 12.4 2.5 whole rock conventional K-Ar TMW1/AH-60 "4.962E-04, 0.581E-04, 1.1167E-04" 0.53 0.095 7 age not evaluated 11969 1 8.1 2.3 whole rock conventional K-Ar RI-28/AH-86 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.0734 5 age not evaluated 11970 1 5.53 0.41 whole rock conventional K-Ar P-324/AH-85 "4.962E-04, 0.581E-04, 1.1167E-04" 1.13 0.0903 19 age not evaluated 11971 1 1.98 0.25 whole rock conventional K-Ar P-22/AH-73 "4.962E-04, 0.581E-04, 1.1167E-04" 0.86 0.0244 11 age not evaluated 11972 1 1.73 0.8 whole rock conventional K-Ar P-319/UT-260 "4.962E-04, 0.581E-04, 1.1167E-04" 0.52 0.013 34 age not evaluated 11973 1 0.98 0.34 whole rock conventional K-Ar P-NOTCH/UT-239 "4.962E-04, 0.581E-04, 1.1167E-04" 1.04 0.0147 4 age not evaluated 11974 1 2.03 0.52 whole rock conventional K-Ar U-FOLEY/UT-200 "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 0.0193 5 age not evaluated 11975 1 10.2 1 whole rock conventional K-Ar MO-ENG-B/UT-232 "4.962E-04, 0.581E-04, 1.1167E-04" 0.231 0.034 14 age not evaluated 11975 2 9.6 1.5 whole rock conventional K-Ar MO-ENG-B/UT-241 "4.962E-04, 0.581E-04, 1.1167E-04" 0.231 0.0319 19 age not evaluated 11976 1 7.67 0.96 whole rock conventional K-Ar MO-160/AH-49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.43 0.0476 11 age not evaluated 11977 1 6.8 1.18 whole rock conventional K-Ar MO-159/UT-220 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4 0.0392 8 age not evaluated 11978 1 2.23 0.37 whole rock conventional K-Ar MB-133/UT-222 "4.962E-04, 0.581E-04, 1.1167E-04" 0.52 0.0167 9 age not evaluated 11979 1 17 0.9 whole rock conventional K-Ar T-14/UT-247 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8 0.1957 28 age not evaluated 11980 1 15.6 0.6 whole rock conventional K-Ar T-10/UT-254 "4.962E-04, 0.581E-04, 1.1167E-04" 1.33 0.2984 47 age not evaluated 11981 1 14.1 0.8 whole rock conventional K-Ar T-F1ZZ/UT-250 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.1964 26 age not evaluated 11982 1 0.97 0.46 whole rock conventional K-Ar T-211/UT-251 "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 0.0115 3 11983 1 0.77 0.21 whole rock conventional K-Ar T-208/AH-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.75 0.0083 5 age not evaluated 11984 1 0.17 0.48 whole rock conventional K-Ar T-210/AH-75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.98 0.0024 1 age not evaluated 11985 1 24.7 2 whole rock conventional K-Ar RB-16/AH-79 "4.962E-04, 0.581E-04, 1.1167E-04" 0.976 0.3489 17 age not evaluated 11986 1 22 1 whole rock conventional K-Ar STACK/UT-199 "4.962E-04, 0.581E-04, 1.1167E-04" 0.651 0.2074 35 age not evaluated 11987 1 21.9 2.9 whole rock conventional K-Ar BB-30/UT-242 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.197 11 age not evaluated 11988 1 15.9 7.6 whole rock conventional K-Ar BB-NSH/AH-62 "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 0.0668 3 age not evaluated 11989 1 8.3 5.5 whole rock conventional K-Ar BB-PAT-MT/AH-63 "4.962E-04, 0.581E-04, 1.1167E-04" 0.12 0.0145 2 age not evaluated 11990 1 0.56 0.16 whole rock conventional K-Ar BB-TPBA/AH-64 "4.962E-04, 0.581E-04, 1.1167E-04" 1.42 0.0114 5 age not evaluated 11991 1 3.77 0.54 whole rock conventional K-Ar TP80-1/UT-205 "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.0367 10 age not evaluated 11992 1 3.75 0.43 anorthoclase conventional K-Ar TP80-2/UT-255 "4.962E-04, 0.581E-04, 1.1167E-04" 3.49 0.1888 12 age not evaluated 11993 1 2.22 0.51 whole rock conventional K-Ar BRD79-2/UT-257 "4.962E-04, 0.581E-04, 1.1167E-04" 1.325 0.0424 6 age not evaluated 11994 1 0.78 0.18 whole rock conventional K-Ar BRD79-3/UT-256 "4.962E-04, 0.581E-04, 1.1167E-04" 1.82 0.0205 6 age not evaluated 11995 1 2.11 0.36 whole rock conventional K-Ar BRD79-5/AH-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.31 0.0399 8 age not evaluated 11996 1 0.92 0.26 whole rock conventional K-Ar BRD81-21/AH-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.18 0.0157 5 age not evaluated 11997 1 0.69 0.48 whole rock conventional K-Ar BRD81-26/AH-82 "4.962E-04, 0.581E-04, 1.1167E-04" 1.26 0.0125 2 age not evaluated 11998 1 0.61 0.04 andesine conventional K-Ar MR76-9/UT-130 "4.962E-04, 0.581E-04, 1.1167E-04" 8.828 0.0771 60 age of volcanism 11999 1 0.61 0.03 andesine conventional K-Ar MR76-10/AH-33 "4.962E-04, 0.581E-04, 1.1167E-04" 8.818 0.0779 35 age of volcanism 12000 1 0.66 0.03 sanidine conventional K-Ar MR76-13/AH-41 "4.962E-04, 0.581E-04, 1.1167E-04" 9.802 0.0931 45 age of volcanism 12001 1 0.77 0.04 sanidine conventional K-Ar MR79-12/AH-39 "4.962E-04, 0.581E-04, 1.1167E-04" 10.354 0.1154 30 age of volcanism 12002 1 7.31 0.26 sanidine conventional K-Ar AV80-1/AH-28 "4.962E-04, 0.581E-04, 1.1167E-04" 10.782 1.1371 60 age of volcanism 12003 1 12.2 0.4 biotite conventional K-Ar EV79-3/AH-13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.66 1.524 55 age of volcanism 12003 2 12.3 0.4 sanidine conventional K-Ar EV79-3/AH-25 "4.962E-04, 0.581E-04, 1.1167E-04" 10.78 1.908 58 age of volcanism 12004 1 12 0.5 sanidine conventional K-Ar EV79-4/UT-208 "4.962E-04, 0.581E-04, 1.1167E-04" 10.28 1.7834 42 age of volcanism 12005 1 12.2 0.4 sanidine conventional K-Ar EV79-5/UT-202 "4.962E-04, 0.581E-04, 1.1167E-04" 9.64 1.6951 60 age of volcanism 12006 1 29.2 1.3 anorthoclase conventional K-Ar ESL MCNEV/AH-66 "4.962E-04, 0.581E-04, 1.1167E-04" 5.23 2.2159 36 age not evaluated 12007 1 29.8 1.1 anorthoclase conventional K-Ar ESL MCNEV/AH-67 "4.962E-04, 0.581E-04, 1.1167E-04" 2.37 1.024 53 age not evaluated 12008 1 32.3 1.3 anorthoclase conventional K-Ar ESL MCNEV/AH-71 "4.962E-04, 0.581E-04, 1.1167E-04" 5.78 2.7122 44 age not evaluated 12009 1 29.4 1.1 sanidine conventional K-Ar ESL MCNEV/AH-68 "4.962E-04, 0.581E-04, 1.1167E-04" 10.01 4.2786 56 age not evaluated 12010 1 31.2 1.3 anorthoclase conventional K-Ar ESL MCNEV/UT-245 "4.962E-04, 0.581E-04, 1.1167E-04" 5.42 2.4553 43 age not evaluated 12011 1 30.5 1.2 anorthoclase conventional K-Ar ESL MCNEV/UT-244 "4.962E-04, 0.581E-04, 1.1167E-04" 5.57 2.4622 46 age not evaluated 12012 1 29.8 1.1 anorthoclase conventional K-Ar ESL MCNEV/UT-246 "4.962E-04, 0.581E-04, 1.1167E-04" 5.24 2.2704 56 age not evaluated 12013 1 4.25 0.3 plagioclase conventional K-Ar 1. PH-1D "4.72E-04, 0.585E-04, 1.19E-04*" 0.392 0.024 12 age of volcanism K=0.325%; 40AR-RAD=5.388XE-8 CC/G 12014 1 10.62 1.2 plagioclase conventional K-Ar 2. PH-40A "4.72E-04, 0.585E-04, 1.19E-04*" 0.535 0.0821 6 age of volcanism K=0.444%; 40AR-RAD=1.839XE-7 CC/G 12015 1 11.9 0.3 plagioclase conventional K-Ar 3. PEH-77-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12015 2 11.5 0.3 plagioclase conventional K-Ar 3. PEH-77-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALLYTICAL DATA GIVEN 12016 1 12.5 0.4 plagioclase conventional K-Ar 4. PEH-77-7 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12016 2 12 0.4 plagioclase conventional K-Ar 4. PEH-77-7 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12017 1 12.6 0.2 plagioclase conventional K-Ar 5. PEH-77-10 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12017 2 12.3 0.2 plagioclase conventional K-Ar 5. PEH-77-10 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12018 1 15.4 1 plagioclase conventional K-Ar 6. PEH-77-9 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12018 2 14.8 0.9 plagioclase conventional K-Ar 6. PEH-77-9 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12018 3 14.7 0.2 whole rock conventional K-Ar 6. PEH-77-9 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12018 4 14.5 0.2 whole rock conventional K-Ar 6. PEH-77-9 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12020 1 24.3 1.1 plagioclase conventional K-Ar 8. PEH-77-8 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12020 2 23.2 0.8 plagioclase conventional K-Ar 8. PEH-77-8 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12022 1 254 6 whole rock 39Ar-40Ar incremental (plateau) 1 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "80-100 MESH, LEACHED IN HCL AND WASHED" SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12023 1 258 6 whole rock 39Ar-40Ar incremental (plateau) 2 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "80-100 MESH, LEACHED IN HCL AND WASHED" SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12024 1 250 5 whole rock 39Ar-40Ar incremental (plateau) 3 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "80-100 MESH, LEACHED IN HCL AND WASHED" SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12025 1 248 7 whole rock 39Ar-40Ar incremental (plateau) 4 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "80-100 MESH, LEACHED IN HCL AND WASHED" SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12026 1 240 5 biotite 39Ar-40Ar incremental (plateau) 5 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12027 1 247 5 biotite 39Ar-40Ar incremental (plateau) 6 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 39AR/40AR ANALYTICAL DATA 12028 1 246 4 biotite 39Ar-40Ar incremental (plateau) 7 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12029 1 244 3 biotite 39Ar-40Ar incremental (plateau) 8 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12030 1 242 3 biotite 39Ar-40Ar incremental (plateau) 9 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12031 1 248 3 biotite 39Ar-40Ar incremental (plateau) 10 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12032 1 240 3 biotite 39Ar-40Ar incremental (plateau) 11 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12033 1 240 4 biotite 39Ar-40Ar incremental (plateau) 12 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12034 1 241 4 biotite 39Ar-40Ar incremental (plateau) 13 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12035 1 245 4 biotite 39Ar-40Ar incremental (plateau) 14 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12036 1 235 4 biotite 39Ar-40Ar incremental (plateau) 15 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA "GRANITE PROBABLY FORMED 276 M.Y. AGO (KOCIS AND OTHERS, 1978)" 12037 1 237 4 biotite 39Ar-40Ar incremental (plateau) 16 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA "GRANITE PROBABLY FORMED 276 M.Y. AGO (KOCIS AND OTHERS, 1978)" 12038 1 243 4 biotite 39Ar-40Ar incremental (plateau) 17 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12039 1 244 3 biotite 39Ar-40Ar incremental (plateau) 18 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12040 1 243 3 biotite 39Ar-40Ar incremental (plateau) 19 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12041 1 239 4 biotite 39Ar-40Ar incremental (plateau) 20 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12042 1 251 3 biotite 39Ar-40Ar incremental (plateau) 21 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12043 1 248 4 biotite 39Ar-40Ar incremental (plateau) 22 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12044 1 244 4 biotite 39Ar-40Ar incremental (plateau) 23 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12045 1 242 3 biotite 39Ar-40Ar incremental (plateau) 24 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12045 2 257 5 hornblende 39Ar-40Ar incremental (plateau) 24 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12046 1 250 4 biotite 39Ar-40Ar incremental (plateau) 25 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12046 2 255 5 hornblende 39Ar-40Ar incremental (plateau) 25 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA 12047 1 253 3 biotite 39Ar-40Ar incremental (plateau) 26 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA "GRANITE PROBABLY FORMED 276 M.Y. AGO (KOCIS AND OTHERS, 1978)" 12070 1 175.2 2.1 whole rock conventional K-Ar 1034 "4.72E-04, 0.585E-04, 1.19E-04" 1.973 31 age of intrusion 30-60 MESH "K=0.6012, 0.6063%" 12071 1 177 2.2 whole rock conventional K-Ar 1105 "4.72E-04, 0.585E-04, 1.19E-04" 1.193 36 age of intrusion 30-60 MESH "K=0.3779, 0.3441, 0.3574%" 12072 1 180.4 6.9 whole rock 39Ar-40Ar incremental (plateau) 1221A "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA; 40AR/36AR VERSUS 39AR/36AR ISOCHRON AGE IS 182.4 M.Y. 12073 1 195.5 5.2 whole rock 39Ar-40Ar incremental (plateau) 1237A "4.72E-04, 0.585E-04, 1.19E-04" 30-60 MESH SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA THIS AGE IS QUESTIONABLE; DIKE IS PROBABLY 177.5 M.Y. OLD 12074 1 183.7 2.8 whole rock 39Ar-40Ar incremental (plateau) 1270C "4.72E-04, 0.585E-04, 1.19E-04" 30-60 MESH SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA; 40AR/36AR VERSUS 39AR/36AR ISOCHRON AGE IS 185.1 M.Y. THE GETTYSBURG SILL IS PROBABLY 177.4 M.Y. OLD 12075 1 171.2 2 whole rock 39Ar-40Ar incremental (plateau) 1261A "4.72E-04, 0.585E-04, 1.19E-04" 30-60 MESH SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA; 40AR/36AR VERSUS 39AR/36AR ISOCHRON AGE IS 167.4 M.Y. THE GETTYSBURG SILL IS PROBABLY 177.4 M.Y. OLD 12076 1 191.1 4.2 whole rock 39Ar-40Ar incremental (plateau) 244B "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR/39AR ANALYTICAL DATA; 40AR/36AR VERSUS 39AR/36AR ISOCHRON AGE IS 187.9 M.Y. 12077 1 176 3.8 whole rock 40Ar/36Ar-40K/36Ar isochron 253B "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA; SOME EXCESS 40AR PROBABLY PRESENT 12078 1 177.7 4.9 whole rock 40Ar/36Ar-40K/36Ar isochron 625 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA; SOME EXCESS 40AR PROBABLY PRESENT 12079 1 180.1 5.3 whole rock 40Ar/36Ar-40K/36Ar isochron 607A "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA; SOME EXCESS 40AR PROBABLY PRESENT 12080 1 168.1 3.9 whole rock 40Ar/36Ar-40K/36Ar isochron 137 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA; SOME EXCESS 40AR PROBABLY PRESENT 12081 1 173.1 13.2 whole rock 40Ar/36Ar-40K/36Ar isochron 101B "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion 30-60 MESH SEE ARTICLE FOR 40AR-39AR ANALYTICAL DATA; SOME EXCESS 40AR PROBABLY PRESENT 12082 1 6.96 0.35 biotite conventional K-Ar 77-3 "4.962E-04, 0.581E-04, 1.1167E-04" 7.72 0.7747 33 K=6.41% THIS AGE IS SPURIOUS; RHYOLITE IS 9.1 M.Y. OLD 12083 1 9.13 sanidine 40Ar/36Ar-40K/36Ar isochron 77-6 "4.962E-04, 0.581E-04, 1.1167E-04" 10.37 1.3672 72 553 age of volcanism K=8.61%; 3-POINT 40AR/36AR VERSUS 40K/36AR ISOCHRON 12083 2 9.13 sanidine 77-6 "4.962E-04, 0.581E-04, 1.1167E-04" 10.37 1.3672 72 age of volcanism K=8.61% 12084 1 9.13 13 biotite 77-7 "4.962E-04, 0.581E-04, 1.1167E-04" 8.17 1.0869 32 553 age of volcanism K=6.78%; 3-POINT 40AR/36AR VERSUS 40K/36AR ISOCHRON 12084 2 9.22 0.46 biotite conventional K-Ar 77-7 "4.962E-04, 0.581E-04, 1.1167E-04" 8.17 1.0869 32 age of volcanism K=6.78% 12085 1 8.01 0.32 biotite conventional K-Ar 77-8 "4.962E-04, 0.581E-04, 1.1167E-04" 8.44 0.9758 43 K=7.01% THIS AGE IS SPURIOUS; RHYOLITE IS 9.1 M.Y. OLD 12086 1 9.13 biotite 40Ar/36Ar-40K/36Ar isochron 79-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 1.1266 20 553 age of volcanism K=7.11%; 3-POINT 40AR/36AR VERSUS 40K/36AR ISOCHRON 12086 2 9.11 0.64 biotite conventional K-Ar 79-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 1.1266 20 age of volcanism K=7.11% 12087 1 51.76 1 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.3995 0.302 49 age of volcanism K=0.3316% 12088 1 50.9 1.4 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.3073 0.2284 34 age of volcanism K=0.2551% 12089 1 53.23 1.3 whole rock conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.305 0.2372 54 age of volcanism K=0.2532% 12090 1 51.87 2.3 whole rock conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.3326 0.252 26 age of volcanism K=0.2761% 12091 1 51.4 4 whole rock conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.3284 0.2465 18 age of volcanism K=0.2726% 12092 1 5.64 0.23 anorthoclase conventional K-Ar D/BE-10C-80/AH-45 "4.962E-04, 0.581E-04, 1.1167E-04" 9.47 0.7699 47 age not evaluated 12093 1 4.77 0.29 sanidine conventional K-Ar D/BE-21A-80/AH-44 "4.962E-04, 0.581E-04, 1.1167E-04" 7.46 0.5123 25 age not evaluated 12094 1 5.81 0.69 anorthoclase conventional K-Ar D/BE-115-80S/AH-223 "4.962E-04, 0.581E-04, 1.1167E-04" 5.52 0.4626 12 age not evaluated 12095 1 27.47 0.8 whole rock conventional K-Ar 1. 66L-26 "4.72E-04, 0.585E-04, 1.19E-04*" 1.36 0.542 73 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 169" 12096 1 24.97 0.8 whole rock conventional K-Ar 2. 66L-30 "4.72E-04, 0.585E-04, 1.19E-04*" 2.66 0.963 63 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 170" 12097 1 20.31 0.6 whole rock conventional K-Ar 4. 68L-16A "4.72E-04, 0.585E-04, 1.19E-04*" 1.52 0.447 81 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 168" 12098 1 19.26 0.4 whole rock conventional K-Ar 5. 66L-98 "4.72E-04, 0.585E-04, 1.19E-04*" 2.49 0.694 83 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 179" 12099 1 15.25 0.8 whole rock conventional K-Ar 7. 68L-15B "4.72E-04, 0.585E-04, 1.19E-04*" 0.44 0.097 38 age of volcanism 12100 1 4.76 0.26 whole rock conventional K-Ar 10. 66L-36 "4.72E-04, 0.585E-04, 1.19E-04*" 1.24 0.085 38 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 171." 12101 1 4.45 0.22 whole rock conventional K-Ar 11. 68L-134I "4.72E-04, 0.585E-04, 1.19E-04*" 1.73 0.111 42 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 165." 12102 1 18.81 0.6 whole rock conventional K-Ar 12. 72L-66H "4.72E-04, 0.585E-04, 1.19E-04*" 3.28 0.893 85 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 141" 12103 1 18.43 0.6 whole rock conventional K-Ar 13. 72L-66B "4.72E-04, 0.585E-04, 1.19E-04*" 3.27 0.872 93 age of volcanism "THIS AGE ALSO REPORTED BY MARVIN AND OTHERS, 1974, ISOCHRON/WEST, NO. 11, ENTRY 142" 12104 1 0.25 0.06 whole rock conventional K-Ar 15. 68L-92 "4.72E-04, 0.585E-04, 1.19E-04*" 1.14 0.0041 9 age of volcanism 12105 1 0.24 0.14 whole rock conventional K-Ar 16. 68L-101 "4.72E-04, 0.585E-04, 1.19E-04*" 1 0.0035 4 age of volcanism 12106 1 5.1 0.4 hornblende conventional K-Ar 1. RWT-408-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12106 2 0.6 0.2 biotite conventional K-Ar 1. RWT-408-80 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 12107 1 22.4 0.9 biotite conventional K-Ar 3. EE-382B "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12108 1 23 2.2 hornblende conventional K-Ar 4. EE-404 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12108 2 22.7 0.7 biotite conventional K-Ar 4. EE-404 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12109 1 23 1.8 hornblende conventional K-Ar 5. EE-395 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12109 2 20.5 1.3 biotite conventional K-Ar 5. EE-395 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12110 1 24.1 0.5 hornblende conventional K-Ar 6. EE-239 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12110 2 20.4 0.8 biotite conventional K-Ar 6. EE-239 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12111 1 25.2 2.3 hornblende conventional K-Ar 7. EE-255 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12112 1 25.2 2 hornblende conventional K-Ar 8. VF-80-234 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12112 2 21.5 0.7 biotite conventional K-Ar 8. VF-80-234 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12113 1 25.6 2 hornblende conventional K-Ar 9. EE-500 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12113 2 20.5 1 biotite conventional K-Ar 9. EE-500 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12114 1 26.7 2.8 hornblende conventional K-Ar 10. RWT-642-79 "4.962E-04, 0.581E-04, 1.1167E-04" maximum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12114 2 22.8 1.1 biotite conventional K-Ar 10. RWT-642-79 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY 25 M.Y. OLD 12115 1 23 3.5 hornblende conventional K-Ar 13. JTW-79-218 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY AROUND 25 M.Y. OLD 12116 1 24.1 0.4 biotite conventional K-Ar 14. JTW-79-219 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 12117 1 35.7 4.3 hornblende conventional K-Ar 23. VF-81-470 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12118 1 33.1 2.8 hornblende conventional K-Ar 24. RWT-445-78 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12119 1 36.8 9.2 hornblende conventional K-Ar 25. JH-80-66 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12120 1 41.7 4.3 hornblende conventional K-Ar 26. RWT-509-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12123 1 81.4 3.1 hornblende conventional K-Ar 29. RWT-198-80 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 12124 1 82.4 4 hornblende conventional K-Ar 30. VF-80-214 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY 85-88 M.Y. OLD 12124 2 82.4 1.3 biotite conventional K-Ar 30. VF-80-214 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN BATHOLITH IS PROBABLY 85-88 M.Y. OLD 12125 1 87.5 7 hornblende conventional K-Ar 32. RWT-475-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12125 2 87.7 0.2 biotite conventional K-Ar 32. RWT-475-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12126 1 89.9 4.3 hornblende conventional K-Ar 38. 78-200 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 12126 2 75.3 1.2 biotite conventional K-Ar 38. 78-200 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism NO ANALYTICAL DATA GIVEN 12128 1 96.3 7.7 hornblende conventional K-Ar 40. RWT-70-81 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 12129 1 118 11.8 hornblende conventional K-Ar 41. JTW-76-199 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 12134 1 40.8 1.3 plagioclase conventional K-Ar NVT-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.751 0.4458 80 age of volcanism K=0.623% 12135 1 38.2 1.4 biotite conventional K-Ar NVT-41 "4.962E-04, 0.581E-04, 1.1167E-04" 8.44 4.6924 58 age of volcanism K=7.01% 12136 1 16.7 1.1 plagioclase conventional K-Ar NVT-42 "4.962E-04, 0.581E-04, 1.1167E-04" 1.08 0.2617 23 age of volcanism K=0.90% 12137 1 14.8 0.6 sanidine conventional K-Ar NVT-43 "4.962E-04, 0.581E-04, 1.1167E-04" 7.59 1.6254 52 age of volcanism K=6.30% 12138 1 38.8 1.3 biotite conventional K-Ar NVT-45 "4.962E-04, 0.581E-04, 1.1167E-04" 8.05 4.544 77 age of volcanism K=6.68% 12139 1 13.6 0.7 whole rock conventional K-Ar TA-3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.66 0.9163 56 age of volcanism K=3.87% 12140 1 130 5 muscovite conventional K-Ar 27Q "4.962E-04, 0.581E-04, 1.1167E-04" 7.69 14.92 93 age of metamorphic crystallization K=6.38% 12141 1 128 4 muscovite conventional K-Ar 38S "4.962E-04, 0.581E-04, 1.1167E-04" 3.99 7.576 90 age of metamorphic crystallization K=3.31% (RATHER IMPURE MUSCOVITE--COMPILER) 12142 1 148 5 hornblende conventional K-Ar 67-53 "4.962E-04, 0.581E-04, 1.1167E-04" 0.843 1.871 79 age of metamorphic crystallization K=0.700% 12143 1 164 6 muscovite conventional K-Ar 67-45B "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 21.14 90 age of metamorphic crystallization K=7.11% 12144 1 1360 30 muscovite conventional K-Ar 88B "4.962E-04, 0.581E-04, 1.1167E-04" 9.37 274.9 91 minimum age of intrusion K=7.78% 12145 1 1350 30 muscovite conventional K-Ar 88C "4.962E-04, 0.581E-04, 1.1167E-04" 10.55 305.1 99 minimum age of intrusion K=8.76% 12146 1 162 3 sericite conventional K-Ar 88A "4.962E-04, 0.581E-04, 1.1167E-04" 9.41 22.94 93 K=7.81% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12147 1 138 3 sericite conventional K-Ar 88H "4.962E-04, 0.581E-04, 1.1167E-04" 7.79 16.07 94 K=6.47% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12147 2 132 3 sericite conventional K-Ar 88H "4.962E-04, 0.581E-04, 1.1167E-04" 7.79 15.36 90 K=6.47% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12148 1 124 3 sericite conventional K-Ar 88F "4.962E-04, 0.581E-04, 1.1167E-04" 7.01 12.9 91 K=5.82% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12148 2 114 2 sericite conventional K-Ar 88F "4.962E-04, 0.581E-04, 1.1167E-04" 7.01 11.88 96 K=5.82% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12149 1 118 2 sericite conventional K-Ar 246A "4.962E-04, 0.581E-04, 1.1167E-04" 6.88 12.08 93 K=5.71% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12150 1 120 2 sericite conventional K-Ar 246B "4.962E-04, 0.581E-04, 1.1167E-04" 6.81 12.19 95 K=5.65% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12151 1 96 2 sericite conventional K-Ar 246C "4.962E-04, 0.581E-04, 1.1167E-04" 7.24 10.27 93 K=6.01% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12152 1 340 7 sericite conventional K-Ar K19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.39 7.456 82 K=1.15% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12153 1 305 6 sericite conventional K-Ar 247 "4.962E-04, 0.581E-04, 1.1167E-04" 6.78 32.43 98 K=5.63% SPURIOUS AGE--XENOCRYSTIC PRECAMBRIAN MICA MAY BE PRESENT 12154 1 78 2 sericite conventional K-Ar K13 "4.962E-04, 0.581E-04, 1.1167E-04" 6.94 7.947 87 K=5.76% "MAY BE A SPURIOUS AGE, NOT THE AGE OF MINERALIZATION" 12155 1 76 2 sericite conventional K-Ar E31 "4.962E-04, 0.581E-04, 1.1167E-04" 6.65 7.474 72 K=5.52% MAY BE A SPURIOUS AGE AND NOT THE AGE OF MINERALIZATION 12156 1 59.6 1.6 sericite conventional K-Ar 157 "4.962E-04, 0.581E-04, 1.1167E-04" 5.47 4.77 51 K=4.54% TIME OF MINERALIZATION 12157 1 58.4 1.2 sericite conventional K-Ar 270 "4.962E-04, 0.581E-04, 1.1167E-04" 6.96 5.952 90 K=5.78% MINERALIZATION PROBABLY OCCURRED 59 M.Y. AGO 12158 1 57.5 1.2 sericite conventional K-Ar 125 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 7.746 92 K=7.65% MINERALIZATION PROBABLY IS 59 M.Y. OLD 12159 1 56.9 2.1 sericite conventional K-Ar 302 "4.962E-04, 0.581E-04, 1.1167E-04" 5.94 4.948 34 K=4.93% MINERALIZATION PROBABLY OCCURRED 59 M.Y. AGO 12160 1 55.9 1.5 sericite conventional K-Ar 276 "4.962E-04, 0.581E-04, 1.1167E-04" 7.51 6.14 56 K=6.23% ALTERATION MAY BE ABOUT 59 M.Y. OLD 12161 1 54.9 1.3 sericite conventional K-Ar 159 "4.962E-04, 0.581E-04, 1.1167E-04" 7.22 5.796 66 K=5.99% MINERALIZATION PROBABLY IS 59 M.Y. OLD 12162 1 54.4 1.3 sericite conventional K-Ar Y37 "4.962E-04, 0.581E-04, 1.1167E-04" 4.48 3.565 62 K=3.72% MINERALIZATION PROBABLY IS 59 M.Y. OLD 12163 1 53.8 1.1 sericite conventional K-Ar 125A "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 7.367 91 K=7.77% MINERALIZATION IS PROBABLY 59 M.Y. OLD 12163 2 53.7 1.1 sericite conventional K-Ar 125A "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 7.34 90 K=7.77% MINERALIZATION IS PROBABLY 59 M.Y. OLD 12164 1 52.7 1.2 sericite conventional K-Ar 256 "4.962E-04, 0.581E-04, 1.1167E-04" 8.24 6.349 77 K=6.84% MINERALIZATION IS PROBABLY 59 M.Y. OLD 12165 1 57 1.2 biotite conventional K-Ar 298 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 7.684 91 age of intrusion K=7.64% 12165 2 57.6 1.2 biotite conventional K-Ar 298 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 7.759 81 age of intrusion K=7.64% 12166 1 57.6 1.2 biotite conventional K-Ar 297 "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 6.8 94 age of intrusion K=6.69% 12166 2 58.4 1.2 biotite conventional K-Ar 297 "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 6.898 92 age of intrusion K=6.69% 12166 3 61.2 1.3 biotite conventional K-Ar 297 "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 7.228 78 maximum age of intrusion K=6.69% 12167 1 62.6 1.3 whole rock conventional K-Ar 78 "4.962E-04, 0.581E-04, 1.1167E-04" 6.67 6.113 90 minimum age of intrusion 1-2 MM SIZE FRACTION K=5.54% 12167 2 63.3 2.2 whole rock conventional K-Ar 78 "4.962E-04, 0.581E-04, 1.1167E-04" 6.42 5.966 37 age of intrusion 2-5 MM SIZE FRACTION K=5.33% 12168 1 61.6 1.3 whole rock conventional K-Ar 293C "4.962E-04, 0.581E-04, 1.1167E-04" 5.08 4.591 84 minimum age of intrusion 1-2 MM SIZE FRACTION K=4.22% 12168 2 65.2 1.4 whole rock conventional K-Ar 293C "4.962E-04, 0.581E-04, 1.1167E-04" 4.88 4.663 85 age of intrusion 2-5 MM SIZE FRACTION K=4.05% 12169 1 77.5 2.4 whole rock conventional K-Ar 91 "4.962E-04, 0.581E-04, 1.1167E-04" 6.87 7.92 43 1-2 MM SIZE FRACTION K=5.70% MAY BE A SPURIOUS AGE 12169 2 84.3 2.2 whole rock conventional K-Ar 91 "4.962E-04, 0.581E-04, 1.1167E-04" 6.91 8.598 55 2-5 MM SIZE FRACTION K=5.74% MAY BE A SPURIOUS AGE 12170 1 76.7 3.1 hornblende conventional K-Ar 150 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.7005 31 K=0.515% MAY BE A SPURIOUS AGE 12170 2 79.3 1.9 hornblende conventional K-Ar 150 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.7228 66 K=0.515% MAY BE A SPURIOUS AGE 12218 1 30.8 1.1 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion "40-200 MESH; 85% BIOTITE, 10% MUSCOVITE" NO ANALYTICAL DATA GIVEN 12219 1 25.5 0.2 plagioclase conventional K-Ar 2. LC-15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 76 age of volcanism K=0.80% 12220 1 25.7 1.3 plagioclase conventional K-Ar 3. AP-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.6 30 age of volcanism K=0.50% 12221 1 34.7 1.3 plagioclase conventional K-Ar 4. F-9 "4.962E-04, 0.581E-04, 1.1167E-04" 3.98 39 age of intrusion K=3.3% 12222 1 33 1 plagioclase conventional K-Ar 5. SW-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.48 41 age of volcanism K=0.4% THIS AGE IS OLDER THAN EXPECTED AND MAY BE SPURIOUS 12223 1 27.3 0.4 sanidine conventional K-Ar 6. SW1-3B "4.962E-04, 0.581E-04, 1.1167E-04" 5.42 62 age of volcanism K=4.5% THIS AGE IS OLDER THAN EXPECTED AND MAY BE SPURIOUS 12224 1 23.5 1.1 plagioclase conventional K-Ar 7. CG-57 "4.962E-04, 0.581E-04, 1.1167E-04" 0.65 30 age of volcanism K=0.54% 12225 1 23.7 0.3 sanidine conventional K-Ar 8. CG-642 "4.962E-04, 0.581E-04, 1.1167E-04" 5.06 69 age of volcanism K=4.2% 12226 1 23.3 0.7 biotite conventional K-Ar 9. CG-55 "4.962E-04, 0.581E-04, 1.1167E-04" 4.94 50 age of volcanism K=4.1% 12227 1 35 3 plagioclase conventional K-Ar 10. F-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.265 84 age not evaluated K=0.22% 12228 1 25.2 2.5 plagioclase conventional K-Ar 11. F-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.76 84 age of volcanism K=0.63% 12229 1 25.6 1 biotite conventional K-Ar 12. F-7 "4.962E-04, 0.581E-04, 1.1167E-04" 4.94 44 age of volcanism K=4.1% 12230 1 27.9 0.9 biotite conventional K-Ar 13. F-1 "4.962E-04, 0.581E-04, 1.1167E-04" 5.78 46 age of volcanism K=4.8% 12231 1 23.1 0.9 hornblende conventional K-Ar 14. F-10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.69 65 age of volcanism K=1.4% 12232 1 22.1 1.3 plagioclase conventional K-Ar 15. BH-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.33 51 age of volcanism K=1.1% 12233 1 28.2 3.9 plagioclase conventional K-Ar 20. PV-21 "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 13 age of volcanism K=1.0% 12234 1 30 3 whole rock conventional K-Ar 21. F-8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.1 88 age of volcanism K=0.91% 12235 1 25.6 4.2 plagioclase conventional K-Ar 22. LC-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 11 age of volcanism K=0.29% 12236 1 18.8 0.2 plagioclase conventional K-Ar 23. CG-32 "4.962E-04, 0.581E-04, 1.1167E-04" 6.26 70 age of volcanism K=5.2% (POTASSIUM VALUE IS TOO LARGE FOR PLAGIOCLASE--COMPILER) 12237 1 19 0.6 plagioclase conventional K-Ar 24. CG-27 "4.962E-04, 0.581E-04, 1.1167E-04" 1.81 41 age of volcanism K=1.5% 12238 1 56.4 1.6 plagioclase conventional K-Ar 26. PV-34 "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 43 K=0.73% ANDESITE IS PROBABLY 17 M.Y. OLD; THE 56 M.Y. AGE MAY RESULT FROM EXCESS ARGON BEING PRESENT 12239 1 24.5 1.7 plagioclase conventional K-Ar 27. PV-33 "4.962E-04, 0.581E-04, 1.1167E-04" 0.71 31 K=0.59% ANDESITE IS PROBABLY 17 M.Y. OLD; THE 24 M.Y. AGE MAY RESULT FROM EXCESS ARGON BEING PRESENT 12240 1 36.4 4 plagioclase conventional K-Ar 28. F-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.55 89 K=0.46% ANDESITE IS PROBABLY 17 M.Y. OLD; THE 36 M.Y. AGE MAY RESULT FROM EXCESS ARGON BEING PRESENT 12241 1 16.8 4.4 plagioclase conventional K-Ar 29. AP-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 7 age of volcanism K=0.68% 12242 1 23.1 0.7 biotite conventional K-Ar 33. CMG1-36 "4.962E-04, 0.581E-04, 1.1167E-04" 9.64 78 age of intrusion K=8.0% 12243 1 22 0.7 biotite conventional K-Ar 34. CMG1-34 "4.962E-04, 0.581E-04, 1.1167E-04" 10.24 69 age of intrusion K=8.5% 12244 1 22.1 biotite conventional K-Ar 35. CMG1-35 "4.962E-04, 0.581E-04, 1.1167E-04" 10.24 70 age of intrusion K=8.5% 12244 2 22.3 0.7 biotite conventional K-Ar 35. CMG1-35 "4.962E-04, 0.581E-04, 1.1167E-04" 9.64 60 age of intrusion K=8.0% 12245 1 23.9 0.7 biotite conventional K-Ar 36. CMG1-68 "4.962E-04, 0.581E-04, 1.1167E-04" 10.6 88 age of intrusion K=8.8% 12246 1 26 0.2 sanidine conventional K-Ar 37. CG-B "4.962E-04, 0.581E-04, 1.1167E-04" 3.61 74 age of intrusion K=3.0% 12247 1 15.4 0.2 biotite conventional K-Ar 38. MC-53 "4.962E-04, 0.581E-04, 1.1167E-04" 5.54 62 age of volcanism K=4.6% 12248 1 15.9 0.1 biotite conventional K-Ar 39. CALL-LX "4.962E-04, 0.581E-04, 1.1167E-04" 6.26 82 age of volcanism K=5.2% 12249 1 24.3 1.6 plagioclase conventional K-Ar 40. VV1-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.71 23 age not evaluated K=0.59% 12250 1 2.46 0.98 biotite conventional K-Ar 43. 9-8-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2297 2 WEIGHTED-MEAN AGE IS 2.99+/-0.20 M.Y. 12250 2 3.04 0.2 plagioclase conventional K-Ar 43. 9-8-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.02 16 WEIGHTED-MEAN AGE IS 2.99+/-0.20 M.Y. 12251 1 21.5 1.3 plagioclase conventional K-Ar 41. VV1-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 51 age not evaluated K=0.55% 12252 1 3.31 0.42 biotite conventional K-Ar 48. 13-113-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3345 4 WEIGHTED-MEAN AGE IS 2.99+/-0.20 M.Y. 12252 2 2.95 0.13 plagioclase conventional K-Ar 48. 13-113-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.022 24 WEIGHTED-MEAN AGE IS 2.99+/-0.20 M.Y. 12253 1 3.75 0.32 biotite conventional K-Ar 44. 9-85-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4134 6 WEIGHTED-MEAN AGE IS 3.14+/-0.15 M.Y. 12253 2 3.09 0.09 sanidine conventional K-Ar 44. 9-85-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5488 66 WEIGHTED-MEAN AGE IS 3.14+/-0.15 M.Y. 12254 1 2.51 0.05 biotite conventional K-Ar 52. 75G317 "4.962E-04, 0.581E-04, 1.1167E-04" 0.313 2834 "40AR-RAD=0.3090, 0.3169XE-10 MOL/GM" WEIGHTED-MEAN AGE IS 2.52+/-0.05 M.Y. 12255 1 2.54 0.05 biotite conventional K-Ar 61. 13-43-13 "4.962E-04, 0.581E-04, 1.1167E-04" 0.314 24 WEIGHTED-MEAN AGE IS 2.52+/-0.05 M.Y. 12256 1 3.56 0.1 whole rock conventional K-Ar 63. 8-191-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.883 0.0441 1246 age of volcanism "40AR-RAD=4.087, 4.736XE-12 MOL/GM; K20=0.883, 0.884, 0.880, 0.886%" 12257 1 5.72 0.17 biotite conventional K-Ar 64. 13-51-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.729 47 age of intrusion 12258 1 5.99 0.08 glass conventional K-Ar 65. 13-52-2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.3 0.3716 4355 age of intrusion "40AR-RAD=0.3688, 0.3744XE-10 MOL/GM; K20=4.35, 4.26, 4.32, 4.27%" 12259 1 5.98 0.06 glass conventional K-Ar 66. 13-52-3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.3 0.3698 4842 age of intrusion "40AR-RAD=0.3658, 0.3737XE-10 MOL/GM; K20=4.32, 4.32, 4.28, 4.28%" 12260 1 5.88 0.18 whole rock conventional K-Ar 67. 78-G-137 "4.962E-04, 0.581E-04, 1.1167E-04" 1.238 0.1049 38 age of volcanism 12261 1 5.25 0.23 whole rock conventional K-Ar 68. 78-G-133 "4.962E-04, 0.581E-04, 1.1167E-04" 1.45 0.1098 23 age of volcanism 12262 1 5.9 0.12 sanidine conventional K-Ar 69. 78-G-70 "4.962E-04, 0.581E-04, 1.1167E-04" 10.18 0.8655 83 age of volcanism 12263 1 5.6 0.17 whole rock conventional K-Ar 70. 78-G-135L "4.962E-04, 0.581E-04, 1.1167E-04" 1.907 0.154 70 age of volcanism 12264 1 5.53 0.22 whole rock conventional K-Ar 71. 78-G-131 "4.962E-04, 0.581E-04, 1.1167E-04" 1.299 0.1035 25 age of volcanism 12265 1 6.04 0.26 whole rock conventional K-Ar 72. 78-G-130 "4.962E-04, 0.581E-04, 1.1167E-04" 1.282 0.1117 23 age of volcanism 12266 1 4.37 0.27 sanidine conventional K-Ar 1. 74L-111 "4.962E-04, 0.581E-04, 1.1167E-04" 0.233 39 age of volcanism 12267 1 3.3 0.2 sanidine conventional K-Ar 2. 74L-113 "4.962E-04, 0.581E-04, 1.1167E-04" 0.191 42 age of volcanism 12268 1 9.87 1.52 whole rock conventional K-Ar 3. 74L-104A "4.962E-04, 0.581E-04, 1.1167E-04" 0.214 14 SPURIOUS AGE; BASALT IS PROBABLY AROUND 3 M.Y. OLD 12269 1 2.92 0.86 whole rock conventional K-Ar 4. 68L-202A "4.962E-04, 0.581E-04, 1.1167E-04" 0.058 9 age of volcanism 12270 1 3.34 0.16 glass conventional K-Ar 5. 68L-204B "4.962E-04, 0.581E-04, 1.1167E-04" 0.203 70 age of volcanism 12271 1 6.03 0.6 plagioclase conventional K-Ar 6. 74L-118B "4.962E-04, 0.581E-04, 1.1167E-04" 0.054 31 "SPURIOUS AGE, BASALT IS PROBABLY 2-3 M.Y. OLD" 12272 1 2.87 0.2 whole rock conventional K-Ar 7. 74L-16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.084 41 age of volcanism 12273 1 2.75 0.3 whole rock conventional K-Ar 8. 74L-117 "4.962E-04, 0.581E-04, 1.1167E-04" 0.062 19 age of volcanism 12274 1 2.65 0.15 whole rock conventional K-Ar 9. 68L-200C "4.962E-04, 0.581E-04, 1.1167E-04" 1.5 0.057 47 age of volcanism "K=1.50, 1.50, 1.51, 1.49%" 12275 1 2.73 0.16 biotite conventional K-Ar 11. 74L-134B "4.962E-04, 0.581E-04, 1.1167E-04" 0.311 36 age of volcanism 12275 2 2.51 0.25 plagioclase conventional K-Ar 10. 74L-134B "4.962E-04, 0.581E-04, 1.1167E-04" 0.037 24 minimum age of volcanism 12276 1 2.42 0.18 whole rock conventional K-Ar 12. 68L-216B "4.962E-04, 0.581E-04, 1.1167E-04" 0.051 30 age of volcanism 12277 1 1.56 0.17 whole rock conventional K-Ar 13. 68L-201B "4.962E-04, 0.581E-04, 1.1167E-04" 1.735 0.039 19 age of volcanism "K20=1.74, 1.75, 1.73, 1.72%" 12278 1 0.38 0.25 whole rock conventional K-Ar 14. 68L-218 "4.962E-04, 0.581E-04, 1.1167E-04" 0.003 3 age of volcanism 12279 1 843 34 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 32.3 98 "THIS IS A REDUCED AGE, LAVA IS AROUND 1070 M.Y OLD" 12280 1 913 40 pyroxenes conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.303 5.19 64 "THIS IS A REDUCED AGE, SILL IS PROBABLY AROUND 1070 M.Y. OLD" 12281 1 954 30 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.32 23.9 92 A SOMEWHAT REDUCED AGE; SILL IS PROBABLY AROUND 1070 M.Y. OLD 12281 2 907 35 pyroxenes 39Ar-40Ar total fusion (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 39AR-40AR TOTAL FUSION AGE; SEE ARTICLE FOR ANALYTICAL DATA THIS IS A REDUCED AGE; SILL IS PROBABLY AROUND 1070 M.Y. OLD 12282 1 904 100 whole rock 40Ar/36Ar-40K/36Ar isochron (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 7-POINT 40AR/36AR-40K/36AR ISOCHRON; SEE ARTICLE FOR ANALYTICAL DATA A DISTURBED AGE; SILL IS PROBABLY AROUND 1070 M.Y. OLD 12283 1 958 30 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 170.3 99 A REDUCED AGE; GNEISS IS PROBABLY AROUND 1700 M.Y. OLD 12289 1 3.1 0.03 plagioclase conventional K-Ar 76-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.194 52 age of intrusion 12290 1 12.4 0.41 plagioclase conventional K-Ar 26-Mar "4.962E-04, 0.581E-04, 1.1167E-04" 1.833 0.3282 59 age of volcanism 12291 1 14.9 0.85 plagioclase conventional K-Ar 11-May "4.962E-04, 0.581E-04, 1.1167E-04" 0.192 0.041 32 age of volcanism 12292 1 17.3 0.36 glass conventional K-Ar V-23 "4.962E-04, 0.581E-04, 1.1167E-04" 3.417 0.858 92 age of volcanism 12293 1 19.1 0.65 plagioclase conventional K-Ar U-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.468 0.13 57 age of volcanism 12294 1 19.8 0.38 plagioclase conventional K-Ar 5-9A "4.962E-04, 0.581E-04, 1.1167E-04" 0.872 0.25 81 age of volcanism 12295 1 18.1 0.5 plagioclase conventional K-Ar 5-9B "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.248 81 age of volcanism 12296 1 25.7 0.52 plagioclase conventional K-Ar TLR75-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.357 0.5183 63 age of volcanism 12297 1 1940 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04" 5.89 WEATHERED (ALTERED) BIOTITE K=4.89%; 40AR-RAD=1.19 PPM FRESH BIOTITE GIVES AN AGE OF AROUND 2500 M.Y. 12298 1 1860 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04" 4.61 WEATHERED (ALTERED) BIOTITE "K=3.83%, 40AR-RAD=0.864 PPM" FRESH BIOTITE GIVES AN AGE OF AROUND 2500 M.Y. 12299 1 1830 biotite conventional K-Ar 3A "4.72E-04, 0.585E-04, 1.19E-04" 5.63 WEATHERED (ALTERED) BIOTITE "K=4.67%, 40AR-RAD=1.028 PPM" FRESH BIOTITE GIVES AN AGE OF AROUND 2500 M.Y. 12300 1 1840 biotite conventional K-Ar 3B "4.72E-04, 0.585E-04, 1.19E-04" 6.43 WEATHERED (ALTERED) BIOTITE "K=5.34%, 40AR-RAD=1.187 PPM" FRESH BIOTITE GIVES AN AGE OF AROUND 2500 M.Y. 12301 1 2500.13 125 biotite conventional K-Ar KA-186 "4.76E-04, 0.589E-04, 1.18E-04*" 8.45 658 minimum age of metamorphic crystallization FRESH BIOTITE 12302 1 2521.91 125 biotite conventional K-Ar KA-14 "4.72E-04, 0.585E-04, 1.19E-04*" 8.29 656 minimum age of metamorphic crystallization FRESH BIOTITE 12303 1 2561.73 130 biotite conventional K-Ar KA-107 "4.72E-04, 0.585E-04, 1.19E-04*" 7.99 651 minimum age of metamorphic crystallization FRESH BIOTITE 12324 1 295.7 6 phlogopite conventional K-Ar EGL-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7 32.38 FINE FRACTION MAXIMUM AGE FOR THE INTRUSIVE IS 290 M.Y. 12324 2 285.9 6 phlogopite conventional K-Ar EGL-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7 31.21 FINE FRACTION MAXIMUM AGE FOR THE INTRUSIVE IS 290 M.Y. 12325 1 409.9 8 phlogopite conventional K-Ar EGL-2 "4.962E-04, 0.581E-04, 1.1167E-04" 7.55 50.05 COARSE FRACTION "SPURIOUS AGE, EXCESS RADIOGENIC ARGON PRESENT" 12325 2 405.5 8 phlogopite conventional K-Ar EGL-2 "4.962E-04, 0.581E-04, 1.1167E-04" 7.55 49.43 COARSE FRACTION "SPURIOUS AGE, EXCESS RADIOGENIC ARGON PRESENT" 12326 1 14.8 0.7 whole rock conventional K-Ar K/AR-2/UT-196 "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.2041 36 age of volcanism "S.A. NOSKER, 1981, UNPUBLISHED MASTER'S THESIS, UNIV. OF NEVADA, REPORTS AN AGE OF 15.0 M.Y. FOR THIS SAMPLE PLUS A SLIGHTLY DIFFERENT ARGON VALUE." 12327 1 13.4 0.5 sanidine conventional K-Ar K/AR-3/UT-213 "4.962E-04, 0.581E-04, 1.1167E-04" 11.06 2.1414 60 age of volcanism "S.A. NOSKER, 1981, UNPUBLISHED MASTER'S THESIS, UNIV. OF NEVADA, REPORTS AN AGE OF 14.4 M.Y. FOR THIS SAMPLE BUT ARGON AND POTASSIUM VALUES ARE DIFFERENT" 12328 1 17.3 0.7 whole rock conventional K-Ar K/AR-4/UT-201 "4.962E-04, 0.581E-04, 1.1167E-04" 1.37 0.344 42 age of volcanism "S.A. NOSKER, 1981, UNPUBLISHED MASTER'S THESIS, UNIV. OF NEVADA, REPORTS AN AGE OF 17.4 M.Y. FOR THIS SAMPLE PLUS A SLIGHTLY DIFFERENT ARGON VALUE" 12329 1 13.4 0.5 whole rock conventional K-Ar K/AR-5/AH-16 "4.962E-04, 0.581E-04, 1.1167E-04" 1.28 0.2468 44 age of volcanism "S.A. NOSKER, 1981, UNPUBLISHED MASTER'S THESIS, UNIV. OF NEVADA, REPORTS AN AGE OF 13.5 M.Y. FOR THIS SAMPLE PLUS A SLIGHTLY DIFFERENT ARGON VALUE" 12330 1 17.2 0.8 whole rock conventional K-Ar K/AR-7/AH-20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.77 0.1916 32 age of volcanism "S.A. NOSKER, 1981, UNPUBLISHED MASTER'S THESIS, UNIV. OF NEVADA, REPORTS AN AGE OF 17.5 M.Y. FOR THIS SAMPLE PLUS A SLIGHTLY DIFFERENT ARGON VALUE" 12371 1 31.8 3.2 plagioclase conventional K-Ar Apr-82 "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 17 age of volcanism K=0.41% 12372 1 22.7 5.9 plagioclase conventional K-Ar 3-26X "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 7 age not evaluated K=0.73% 12373 1 13.1 2.5 plagioclase conventional K-Ar PP-100 "4.962E-04, 0.581E-04, 1.1167E-04" 0.265 10 age of volcanism K=0.22% 12381 1 1326 10 hornblende 1. H79TM-99Z "4.962E-04, 0.581E-04, 1.1167E-04" 1.528 43.09 98 WEIGHTED AVERAGE AGE IS 1350+/-40 M.Y. 12381 2 1334 hornblende conventional K-Ar 1. H79TM-99Z "4.962E-04, 0.581E-04, 1.1167E-04" 1.528 43.49 98 WEIGHTED AVERAGE AGE IS 1350+/-40 M.Y. 12381 3 1371 hornblende conventional K-Ar 1. H79TM-99Z "4.962E-04, 0.581E-04, 1.1167E-04" 1.528 43.18 63 WEIGHTED AVERAGE AGE IS 1350+/-40 M.Y. 12382 1 439 32 hornblende conventional K-Ar 2. H79TM-97B "4.962E-04, 0.581E-04, 1.1167E-04" 0.52 4.105 89 DIKE IS PROBABLY MIDDLE PROTEROZOIC IN AGE; CALCULATED AGE IS A COOLING AGE 12383 1 231.4 7 biotite conventional K-Ar 3. H79TM-103 "4.962E-04, 0.581E-04, 1.1167E-04" 9.125 32.43 94 AUGEN GNEISS IS PRECAMBRIAN; CALCULATED AGE IS A COOLING AGE 12383 2 229.1 7 biotite conventional K-Ar 3. H79TM-103 "4.962E-04, 0.581E-04, 1.1167E-04" 9.125 32.09 79 AUGEN GNEISS IS PRECAMBRIAN; CALCULATED AGE IS A COOLING AGE 12384 1 165.6 5 hornblende conventional K-Ar 4. H79TM-486 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7085 1.769 73 age of intrusion CALCULATED AGE MAY BE A COOLING AGE--PLUTON COULD BE PRECAMBRIAN 12384 2 167.5 5 hornblende conventional K-Ar 4. H79TM-486 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7085 1.797 58 CALCULATED AGE MAY BE A COOLING AGE--PLUTON COULD BE PRECAMBRIAN 12384 3 96.5 3 biotite conventional K-Ar 4. H79TM-486 "4.962E-04, 0.581E-04, 1.1167E-04" 8.725 12.46 37 CALCULATED AGE IS A COOLING AGE 12384 4 103.5 3 biotite conventional K-Ar 4. H79TM-486 "4.962E-04, 0.581E-04, 1.1167E-04" 8.725 13.38 44 CALCULATED AGE IS A COOLING AGE 12385 1 101 3 biotite conventional K-Ar 5. H79TM-486A "4.962E-04, 0.581E-04, 1.1167E-04" 8.155 12.2 80 age of intrusion 12385 2 101.5 3 biotite conventional K-Ar 5. H79TM-486A "4.962E-04, 0.581E-04, 1.1167E-04" 8.155 12.26 89 age of intrusion 12386 1 104.6 3.2 hornblende conventional K-Ar 6. H79TM-121 "4.962E-04, 0.581E-04, 1.1167E-04" 0.832 1.29 63 age of intrusion 12386 2 107.3 3.2 hornblende conventional K-Ar 6. H79TM-121 "4.962E-04, 0.581E-04, 1.1167E-04" 0.832 1.324 57 maximum age of intrusion 12386 3 99.1 2.9 biotite conventional K-Ar 6. H79TM-121 "4.962E-04, 0.581E-04, 1.1167E-04" 8.007 11.75 81 minimum age of intrusion 12386 4 95.7 biotite conventional K-Ar 6. H79TM-121 "4.962E-04, 0.581E-04, 1.1167E-04" 8.007 11.33 87 minimum age of intrusion 12387 1 104.1 6 hornblende conventional K-Ar 7. H79TM-137 "4.962E-04, 0.581E-04, 1.1167E-04" 0.92 1.371 72 age of intrusion 12387 2 93 3.2 biotite conventional K-Ar 7. H79TM-137 "4.962E-04, 0.581E-04, 1.1167E-04" 8.56 11.17 95 minimum age of intrusion 12388 1 86.8 2.6 hornblende conventional K-Ar 8. H79TM-112 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4225 0.5084 51 age of intrusion 12389 1 72.4 2.6 biotite conventional K-Ar 9. H79AR-466 "4.962E-04, 0.581E-04, 1.1167E-04" 8.835 9.396 84 minimum age of intrusion 12390 1 20.2 1 biotite conventional K-Ar 10. H79MO-149 "4.962E-04, 0.581E-04, 1.1167E-04" 8.585 2.509 33 age of volcanism 12391 1 20 0.7 biotite conventional K-Ar 11. H79MO-157 "4.962E-04, 0.581E-04, 1.1167E-04" 8.253 2.388 65 age of volcanism 12392 1 18.1 0.6 whole rock conventional K-Ar 12. KH78-111 "4.962E-04, 0.581E-04, 1.1167E-04" 2.745 0.7182 63 age of volcanism 12393 1 18.1 0.6 sanidine conventional K-Ar 13. H79CH-299 "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 2.285 73 age of volcanism 12394 1 18.3 0.6 sanidine conventional K-Ar 14. H79LP-56 "4.962E-04, 0.581E-04, 1.1167E-04" 9.41 2.498 67 age of volcanism 12410 1 28.9 0.8 biotite conventional K-Ar 1. 74L-12 "4.72E-04, 0.585E-04, 1.19E-04" 3.43 69 age of intrusion 12410 2 30.1 1 hornblende conventional K-Ar 1. 74L-12 "4.72E-04, 0.585E-04, 1.19E-04" 0.27 59 age of intrusion 12411 1 31.9 1 plagioclase conventional K-Ar 2. 74L-4 "4.72E-04, 0.585E-04, 1.19E-04" 0.638 60 age of intrusion 12412 1 20.3 0.4 sericite conventional K-Ar 3. UHT-555 "4.72E-04, 0.585E-04, 1.19E-04" 2.77 83 SERICITE PLUS ABOUT 5% QUARTZ AND PYRITE TIME OF MINERALIZATION 12413 1 10.5 0.5 adularia conventional K-Ar 4. 6811 "4.72E-04, 0.585E-04, 1.19E-04" 1.89 56 "COARSE, CLEAR ADULARIA" TIME OF MINERALIZATION 12414 1 10.2 0.3 K feldspar conventional K-Ar 5. CB-17 "4.72E-04, 0.585E-04, 1.19E-04" 2.34 57 FINE-GRAINED INTERLOCKING K-FELDSPAR TIME OF MINERALIZATION 12415 1 17.43 0.5 K feldspar conventional K-Ar 6. IDA-78 "4.72E-04, 0.585E-04, 1.19E-04*" 15.11 3.81 75 FINE-GRAINED INTERLOCKING K-FELDSPAR TIME OF MINERALIZATION 12415 2 13.44 0.4 sericite conventional K-Ar 6. IDA-78 "4.72E-04, 0.585E-04, 1.19E-04*" 6.95 1.35 72 "SERICITE PLUS 10-15% IMPURITIES, MAINLY CHLORITE" AGE IS APPARENTLY TOO YOUNG 12418 1 21.3 0.6 sanidine conventional K-Ar 9. NB-BI "4.72E-04, 0.585E-04, 1.19E-04" 3.42 88 minimum age of intrusion 12418 2 23.6 0.7 biotite conventional K-Ar 9. NB-BI "4.72E-04, 0.585E-04, 1.19E-04" 3.1 78 age of intrusion 12419 1 22.4 0.6 sanidine conventional K-Ar 10. CS-21 "4.72E-04, 0.585E-04, 1.19E-04" 3.8 83 age of intrusion 12419 2 23.6 0.7 biotite conventional K-Ar 10. CS-21 "4.72E-04, 0.585E-04, 1.19E-04" 2.8 75 age of intrusion 12421 1 22.5 0.6 sanidine conventional K-Ar 12. 73L-103 "4.72E-04, 0.585E-04, 1.19E-04" 3.03 80 age of intrusion 12422 1 14.5 0.4 andesine conventional K-Ar 13. 73L-101 "4.72E-04, 0.585E-04, 1.19E-04" 2.16 71 minimum age of intrusion 12423 1 19.11 0.5 sanidine conventional K-Ar 14. 72L-47 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 2.44 68 age of intrusion 12423 2 18.96 0.4 biotite conventional K-Ar 14. 72L-47 "4.72E-04, 0.585E-04, 1.19E-04*" 9.11 2.5 72 age of intrusion 12438 1 3.6 0.06 phlogopite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 35-100 MESH SIZE FRACTION NO ANALYTICAL DATA GIVEN 12438 2 3.55 0.21 phlogopite 39Ar-40Ar total fusion 1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism 35-100 MESH SIZE FRACTION NO ANALYTICAL DATA GIVEN 12439 1 3.47 0.07 phlogopite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12439 2 3.42 0.07 sanidine conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12440 1 3.04 0.04 phlogopite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 60-100 MESH SIZE FRACTION NO ANALYTICAL DATA GIVEN PREFERRED AGE IS 3.59 M.Y. 12440 2 4.05 0.22 phlogopite 39Ar-40Ar total fusion 3 "4.962E-04, 0.581E-04, 1.1167E-04" 60-100 MESH SIZE FRACTION NO ANALYTICAL DATA GIVEN PREFERRED AGE IS 3.59 M.Y. 12440 3 3.68 0.18 phlogopite 39Ar-40Ar total fusion 3 "4.962E-04, 0.581E-04, 1.1167E-04" 100-200 MESH SIZE FRACTION NO ANALYTICAL DATA GIVEN PREFERRED AGE IS 3.59 M.Y. 12440 4 3.6 0.1 sanidine 39Ar-40Ar total fusion 3 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN PREFERRED AGE IS 3.59 M.Y. 12441 1 0.81 0.14 whole rock conventional K-Ar CNV-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.022 15 age of volcanism 12442 1 1.37 0.15 whole rock conventional K-Ar 68L-189 "4.962E-04, 0.581E-04, 1.1167E-04" 0.023 21 age of volcanism 12443 1 2.2 0.17 whole rock conventional K-Ar 68L-228 "4.962E-04, 0.581E-04, 1.1167E-04" 0.041 32 age of volcanism 12444 1 3.07 0.34 whole rock conventional K-Ar 68L-187 "4.962E-04, 0.581E-04, 1.1167E-04" 0.033 22 age of volcanism 12445 1 3.53 1.2 whole rock conventional K-Ar OMV-2WPA "4.962E-04, 0.581E-04, 1.1167E-04" 0.098 8 age of volcanism 12446 1 3.83 0.46 whole rock conventional K-Ar 1C2A "4.962E-04, 0.581E-04, 1.1167E-04" 0.132 18 age of volcanism 12447 1 4.53 0.18 whole rock conventional K-Ar 1C2B "4.962E-04, 0.581E-04, 1.1167E-04" 0.155 53 age of volcanism 12448 1 4.19 0.25 whole rock conventional K-Ar IL2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.078 47 age of volcanism 12449 1 4.12 0.24 whole rock conventional K-Ar 4C2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.128 48 age of volcanism 12450 1 4.32 0.44 whole rock conventional K-Ar 2C2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.165 25 age of volcanism 12451 1 4.47 0.23 whole rock conventional K-Ar 68L-196 "4.962E-04, 0.581E-04, 1.1167E-04" 0.127 58 age of volcanism 12452 1 4.52 0.34 whole rock conventional K-Ar GV-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.106 36 age of volcanism 12453 1 4.67 0.32 whole rock conventional K-Ar GMV-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.079 41 age of volcanism 12454 1 5.74 0.34 whole rock conventional K-Ar 6CV-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.122 47 age of volcanism 12455 1 5.94 0.4 Unk conventional K-Ar 68L-188 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1 56 age of volcanism 12456 1 8.34 0.5 whole rock conventional K-Ar CV-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.214 47 age of volcanism 12457 1 109 biotite conventional K-Ar RDB-68 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 14.17 78 age of intrusion 12458 1 107 biotite conventional K-Ar RDA-6 "4.962E-04, 0.581E-04, 1.1167E-04" 8.9 11.47 95 minimum age of intrusion 12459 1 810 20 whole rock conventional K-Ar B-8 "4.72E-04, 0.585E-04, 1.19E-04" 46.3 98 "THIS IS A REDUCED AGE, CAUSE OF LOW AGE IS NOT KNOWN" 12460 1 800.44 20 whole rock conventional K-Ar TB-6 "4.72E-04, 0.585E-04, 1.19E-04*" 3.33 48.3 95 "THIS IS A REDUCED AGE, CAUSE OF LOW AGE IS NOT KNOWN" 12466 1 781 20 whole rock conventional K-Ar B-4 "4.72E-04, 0.585E-04, 1.19E-04" 59.8 99 "THIS IS A REDUCED AGE, CAUSE OF LOW AGE IS NOT KNOWN" 12467 1 1.32 0.09 whole rock conventional K-Ar CC79-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.275 0.0242 20 age of volcanism K=1.058% 12468 1 2.53 0.52 whole rock conventional K-Ar DV79-8L "4.962E-04, 0.581E-04, 1.1167E-04" 1.02 0.0372 7 age of volcanism K=0.847% 12469 1 2.62 0.35 whole rock conventional K-Ar DV79-8U "4.962E-04, 0.581E-04, 1.1167E-04" 0.99 0.0374 10 age of volcanism K=0.822% 12533 1 0.55 0.01 sanidine conventional K-Ar 10. 78G175 "4.962E-04, 0.581E-04, 1.1167E-04" 10.64 0.0848 72 age of volcanism 12536 1 1.06 0.01 sanidine conventional K-Ar 16. 78G12 "4.962E-04, 0.581E-04, 1.1167E-04" 10.3 0.1576 91 age of volcanism 12538 1 2.1 0.02 sanidine conventional K-Ar 37. 79G10 "4.962E-04, 0.581E-04, 1.1167E-04" 9.43 0.2859 83 age of volcanism 12606 1 9.2 0.68 plagioclase conventional K-Ar 1. B-2/UT-283 "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 0.1696 19 age of volcanism 12607 1 7.73 0.44 plagioclase conventional K-Ar 2. B-13/AH-108 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 0.1748 26 age of volcanism 12608 1 10.8 1.1 plagioclase conventional K-Ar 3. B-22/AH-109 "4.962E-04, 0.581E-04, 1.1167E-04" 0.69 0.1292 14 age of volcanism 12609 1 5.55 0.69 whole rock conventional K-Ar 4. B-23/UT-284 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 0.1252 11 age of volcanism 12610 1 49.79 4.6 hornblende conventional K-Ar 1. 82-VP-2 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.201 0.1461 18 age of intrusion "K=0.167%, 40AR-RAD=0.000584 PPM" 12611 1 86.6 2.5 sericite conventional K-Ar 1. SF-R1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.78 12.489 94 GREEN SERICITE TIME OF CONTACT ALTERATION 12612 1 84.1 2.5 sericite conventional K-Ar 2. RF-R2K "4.962E-04, 0.581E-04, 1.1167E-04" 11.05 0.137 91 TIME OF HYDROTHERMAL ALTERATION 12613 1 79.8 2.4 muscovite conventional K-Ar 3. PM-18K "4.962E-04, 0.581E-04, 1.1167E-04" 11 0.1292 97 age of intrusion 12614 1 80.8 2.4 biotite conventional K-Ar 4. PGH-R20K "4.962E-04, 0.581E-04, 1.1167E-04" 9.17 0.1091 94 SECONDARY BIOTITE TIME OF ALTERATION AND MINERALIZATION 12615 1 7.62 0.4 whole rock conventional K-Ar 1. H-9-3A "4.962E-04, 0.581E-04, 1.1167E-04" 5.49 0.6038 46 minimum age of volcanism 12616 1 8.22 0.38 whole rock conventional K-Ar 2. H-9-6C "4.962E-04, 0.581E-04, 1.1167E-04" 4.81 0.5706 80 age of volcanism 12616 2 8 0.38 whole rock conventional K-Ar 2. H-9-6C "4.962E-04, 0.581E-04, 1.1167E-04" 4.81 0.5552 84 age of volcanism 12617 1 11.65 0.53 whole rock conventional K-Ar 3. H-9-10 "4.962E-04, 0.581E-04, 1.1167E-04" 5.17 0.8689 91 age of volcanism 12618 1 9.88 0.46 whole rock conventional K-Ar 4. H-9-11 "4.962E-04, 0.581E-04, 1.1167E-04" 4.02 0.5733 86 age of volcanism 12619 1 11.22 0.52 whole rock conventional K-Ar 5. H-9-15A "4.962E-04, 0.581E-04, 1.1167E-04" 5.12 0.8282 86 age of volcanism 12620 1 13.58 0.63 whole rock conventional K-Ar 6. H-9-26A "4.962E-04, 0.581E-04, 1.1167E-04" 5.04 0.9887 89 age of volcanism 12620 2 13.07 0.59 glass conventional K-Ar 6. H-9-26A "4.962E-04, 0.581E-04, 1.1167E-04" 5.7 1.0761 91 age of volcanism 12621 1 14.38 0.7 whole rock conventional K-Ar 7. H-9-41 "4.962E-04, 0.581E-04, 1.1167E-04" 5.06 1.0516 64 age of volcanism 12622 1 1.38 0.29 Unk conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12623 1 0.68 0.55 Unk conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12624 1 0.19 0.04 Unk conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12625 1 397 29 glauconite conventional K-Ar JH-5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.13 52.01 19 K=6.75% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12626 1 376 40 glauconite conventional K-Ar JH-7 "4.962E-04, 0.581E-04, 1.1167E-04" 7.04 42.37 13 K=5.84% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12627 1 409 14 glauconite conventional K-Ar JH-1A "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 51.89 75 SAMPLE BAKED FOR 15 HOURS AT 150-DEGREES C K=6.51% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON. MAY HAVE BEEN SOME LOSS OF ARGON ON BAKE-OUT 12627 2 449 15 glauconite conventional K-Ar JH-1B "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 57.57 70 SAMPLE BAKED FOR 15 HOURS AT 50-DEGREES C K=6.51% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12627 3 425 14 glauconite conventional K-Ar JH-1C "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 54.13 84 SAMPLE DEGASSED FOR 15 HOURS AT ROOM TEMPERATURE K=6.51% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12628 1 397 29 glauconite conventional K-Ar JH-5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.13 52.01 19 K=6.75% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12629 1 376 40 glauconite conventional K-Ar JH-7 "4.962E-04, 0.581E-04, 1.1167E-04" 7.04 42.37 13 K=5.84% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12630 1 409 14 glauconite conventional K-Ar JH-1A "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 51.89 75 SAMPLE BAKED FOR 15 HOURS AT 150-DEGREES C K=6.51% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON. MAY HAVE BEEN SOME LOSS OF ARGON ON BAKE-OUT 12630 2 449 15 glauconite conventional K-Ar JH-1B "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 57.57 70 SAMPLE BAKED FOR 15 HOURS AT 50-DEGREES C K=6.51% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12630 3 425 14 glauconite conventional K-Ar JH-1C "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 54.13 84 SAMPLE DEGASSED FOR 15 HOURS AT ROOM TEMPERATURE K=6.51% AGE IS TOO YOUNG--PROBABLY DUE TO LOSS OF RADIOGENIC ARGON 12633 1 5.3 0.7 whole rock conventional K-Ar 1. ALT20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.384 0.0294 4 age of volcanism 12634 1 5.6 0.6 whole rock conventional K-Ar 2. DG1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.27 0.0225 9 age of volcanism 12635 1 5.9 0.7 whole rock conventional K-Ar 3. ALT4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.19 0.0161 4 age of volcanism 12636 1 6 4.2 whole rock conventional K-Ar 4. ALT18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0208 1 age of volcanism 12637 1 6.3 4 whole rock conventional K-Ar 5. ALT19 "4.962E-04, 0.581E-04, 1.1167E-04" 0.167 0.015 2 age of volcanism 12638 1 6.6 1.2 whole rock conventional K-Ar 6. ALT6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.431 0.0407 6 age of volcanism 12639 1 6.7 2.5 whole rock conventional K-Ar 7. ALT12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.328 0.0315 4 age of volcanism 12640 1 6.8 0.7 whole rock conventional K-Ar 8. PRM-2-70 "4.962E-04, 0.581E-04, 1.1167E-04" 0.471 0.0472 13 age of volcanism 12641 1 7.1 2.5 whole rock conventional K-Ar 9. ALT11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.268 0.0275 3 age of volcanism 12642 1 7.8 4 whole rock conventional K-Ar 10. ALT8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.201 0.0227 3 age of volcanism 12643 1 7.8 4.3 whole rock conventional K-Ar 11. ALT1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.18 0.0203 2 age of volcanism 12644 1 8.5 1.3 whole rock conventional K-Ar 12. 7-78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.126 0.0155 6 age of volcanism 12645 1 8.5 1.3 whole rock conventional K-Ar 13. ALT10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.257 0.0316 7 age of volcanism 12646 1 9.5 2 whole rock conventional K-Ar 14. ALT9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.178 0.0245 5 age of volcanism 12647 1 2.9 2.5 whole rock conventional K-Ar 29. ALT26 "4.962E-04, 0.581E-04, 1.1167E-04" 0.226 0.0092 1 age of volcanism 12648 1 5.7 0.6 whole rock conventional K-Ar 15. ALT21 "4.962E-04, 0.581E-04, 1.1167E-04" 1.305 0.1066 13 age of volcanism 12649 1 8.2 0.2 whole rock conventional K-Ar 16. ALT22 "4.962E-04, 0.581E-04, 1.1167E-04" 1.367 0.1622 40 age of volcanism 12650 1 8.7 0.4 whole rock conventional K-Ar 17. ALT13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.276 0.1596 20 age of volcanism 12651 1 10.5 0.2 whole rock conventional K-Ar 18. 10-78 "4.962E-04, 0.581E-04, 1.1167E-04" 2.78 0.422 52 age of volcanism 12652 1 5.4 0.9 whole rock conventional K-Ar 19. ALT15 "4.962E-04, 0.581E-04, 1.1167E-04" 3.29 0.2564 4 age of volcanism 12653 1 5.8 4 plagioclase conventional K-Ar 21. M-5-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.32 0.0266 1 age of volcanism 12654 1 10.2 0.3 glass conventional K-Ar 30. S-5 "4.962E-04, 0.581E-04, 1.1167E-04" 3.47 0.5226 60 minimum age of volcanism OBSIDIAN 12655 1 1.9 0.9 glass conventional K-Ar 32. KFE-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.0131 2 age of volcanism OBSIDIAN 12656 1 15.1 0.8 glass conventional K-Ar 33. 39-78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.741 0.1619 31 age of volcanism OBSIDIAN 12657 1 2.3 0.4 glass conventional K-Ar 31. KFW-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.234 0.0407 7 age of volcanism OBSIDIAN 12658 1 7.7 4 plagioclase conventional K-Ar 27. ALT23 "4.962E-04, 0.581E-04, 1.1167E-04" 0.36 0.0399 2 age of volcanism 12659 1 0.29 0.2 whole rock conventional K-Ar TSV-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0091 2 age of volcanism "ANALYTICAL DATA SUPPLIED BY WILL CARR, USGS" 12660 1 0.23 0.02 whole rock conventional K-Ar TSV-283-80 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0059 3 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 12661 1 0.3 0.1 whole rock conventional K-Ar TSV-129-78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0076 2 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 12662 1 1.14 0.3 whole rock conventional K-Ar TSV-128 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0282 6 age of volcanism "ANALYTICAL DATA SUPPLIED BY WILL CARR, USGS" 12662 2 1.07 0.04 whole rock conventional K-Ar TSV-128 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0267 5 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 12663 1 1.09 0.3 whole rock conventional K-Ar TSV-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0284 97 age of volcanism "40AR-RAD=3.334 AND 2.342XE-12 MOL/GM; ANALYTICAL DATA SUPPLIED BY WILL CARR, USGS" 12664 1 1.07 0.4 whole rock conventional K-Ar TSV-2A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0258 635 age of volcanism "40AR-RAD=3.673, 1.625, 2.452XE-12 MOL/GM; ANALYTICAL DATA SUPPLIED BY WILL CARR" 12665 1 1.5 0.1 whole rock conventional K-Ar TSV-378-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0352 12 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 12666 1 1.11 0.3 whole rock conventional K-Ar TSV-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0268 76 age of volcanism "ANALYTICAL DATA SUPPLIED BY WILL CARR, USGS" 12667 1 3.85 0.13 whole rock conventional K-Ar CF79-24-8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0879 25 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 12668 1 3.64 0.13 whole rock conventional K-Ar CF79-26-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0925 39 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 12675 1 219 9 whole rock conventional K-Ar BAKER 10B "4.962E-04, 0.581E-04, 1.1167E-04" 0.148 0.4966 44 minimum age of metamorphic crystallization K=0.123% 12676 1 221 8 whole rock conventional K-Ar BAKER 10D "4.962E-04, 0.581E-04, 1.1167E-04" 1.19 4.026 88 minimum age of metamorphic crystallization K=0.987% 12677 1 277 9 muscovite conventional K-Ar NR-311 "4.962E-04, 0.581E-04, 1.1167E-04" 7.728 33.41 96 age of metamorphic crystallization K=6.415% 12677 2 279 9 hornblende conventional K-Ar NR-311 "4.962E-04, 0.581E-04, 1.1167E-04" 0.456 1.988 83 age of metamorphic crystallization K=0.3785% 12679 1 1189 20 whole rock conventional K-Ar GSC81-199 (79-1-133) "4.962E-04, 0.581E-04, 1.1167E-04" 4.64 99 K=3.85% REDUCED AGE; GRANITE PROBABLY FORMED 1500 M.Y. AGO 12680 1 1236 21 whole rock conventional K-Ar GSC81-200 (79-1-134) "4.962E-04, 0.581E-04, 1.1167E-04" 3.76 99 K=3.12% REDUCED AGE; GRANITE PROBABLY FORMED 1500 M.Y. AGO 12681 1 1554 27 whole rock conventional K-Ar GSC81-201 (79-2-70) "4.962E-04, 0.581E-04, 1.1167E-04" 3.29 99 age of intrusion K=2.73% 12682 1 0.94 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12683 1 1.5 0.3 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12684 1 3.8 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12685 1 0.38 0.25 Unk conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 12694 1 31.8 1.3 glass conventional K-Ar (NOT GIVEN) no decay constants given minimum age of volcanism NO ANALYTICAL DATA GIVEN 12695 1 26.98 1.1 sanidine conventional K-Ar D-G "4.72E-04, 0.585E-04, 1.19E-04*" 5.704 2.232 7171 age of volcanism K=4.735% 12696 1 26.53 1.1 anorthoclase conventional K-Ar TT "4.72E-04, 0.585E-04, 1.19E-04*" 5.126 1.972 5454 age of intrusion K=4.255% 12697 1 26.6 1.4 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 12698 1 34.4 1.2 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 12699 1 55.8 1.4 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 8.19 6.675 88 age of volcanism K=6.80% 12699 2 24.8 0.8 glass conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 3.9 1.4 50 K=3.24% THIS IS A SPURIOUS AGE. RADIOGENIC ARGON WAS PROBABLY LOST DURING HYDRATION OF THE GLASS 12701 1 126 4 biotite conventional K-Ar 485 "4.72E-04, 0.584E-04, 1.19E-04" 17.724 97 age of intrusion 12702 1 103 3 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04" 14.738 95 age of intrusion 12705 1 98.6 3 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 12.68 92 THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12705 2 105 3.2 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.893 1.385 73 minimum age of intrusion 12705 3 103 3.1 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.893 1.364 62 minimum age of intrusion HORNBLENDE FUSED WITH PYREX FLUX 12706 1 87.8 2.6 biotite conventional K-Ar 1A "4.962E-04, 0.581E-04, 1.1167E-04" 9.63 12.48 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12706 2 93.5 2.7 hornblende conventional K-Ar 1A "4.962E-04, 0.581E-04, 1.1167E-04" 0.947 1.309 78 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12707 1 71.1 2.1 biotite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.05 9.452 75 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12708 1 71 2.1 biotite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.92 9.303 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12709 1 68 2 biotite conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 9.145 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12710 1 70.3 2.1 biotite conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 8.966 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12711 1 71.4 2.1 biotite conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 8.76 9.18 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12711 2 70.5 2.1 hornblende conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.695 0.7191 53 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12712 1 65 2.6 hornblende conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.284 1.223 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12713 1 66.4 2 biotite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 9.03 8.793 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12713 2 74.8 2.2 hornblende conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.052 1.158 70 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12714 1 65.1 2 biotite conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 9.09 8.672 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THE MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12715 1 64.6 1.9 biotite conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 6.82 6.453 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12716 1 64.7 1.9 biotite conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 9.13 8.654 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12717 1 60.8 1.8 biotite conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 8.66 7.707 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12718 1 79.1 2.4 biotite conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 9.37 10.91 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12718 2 85.5 2.6 muscovite conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 10.31 12.99 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12719 1 66.6 2 biotite conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 9.17 8.95 84 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12720 1 64.6 1.9 biotite conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 8.507 83 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12721 1 65.3 2 biotite conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 8.966 82 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12722 1 113 3.4 hornblende conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 1.392 2.299 84 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12723 1 56.6 1.7 biotite conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 7.76 6.426 77 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12723 2 57.8 1.7 biotite conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 7.55 86 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12724 1 71.7 2.9 biotite conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 8.68 9.144 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12724 2 73.3 2.2 hornblende conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.259 1.356 65 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12725 1 70.8 2.8 biotite conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 9.122 95 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12726 1 64.2 1.9 biotite conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 8.33 7.835 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12727 1 71.8 2.2 biotite conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 7.63 8.049 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12727 2 118 3.5 hornblende conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.288 0.5059 43 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12728 1 64.9 1.9 biotite conventional K-Ar 22A "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 7.828 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12728 2 65 2 biotite conventional K-Ar 22A "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 7.841 79 REPLICATE A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THE MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12728 3 147 4.4 hornblende conventional K-Ar 22A "4.962E-04, 0.581E-04, 1.1167E-04" 0.357 0.7851 79 POSSIBLY A REDUCED AGE 12729 1 59.8 1.8 biotite conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 9.1 7.967 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12729 2 63.1 1.9 hornblende conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 1.655 1.531 86 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12730 1 58.5 1.8 biotite conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 7.655 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12731 1 73.3 2.2 biotite conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 9.11 9.808 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12731 2 70.6 2.1 hornblende conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 1.276 1.324 70 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12732 1 74.7 2.2 biotite conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 8.42 9.246 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12733 1 74.3 2.2 biotite conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 9.53 10.41 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12734 1 74.9 2.2 biotite conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 9.35 10.3 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12735 1 67.2 2 biotite conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 9.27 9.142 85 REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12736 1 77.5 2.3 biotite conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" 9.43 10.75 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12737 1 78.3 2.3 biotite conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5 10.94 79 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12737 2 75.2 2.3 hornblende conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 0.579 0.6402 58 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12738 1 77.2 2.3 biotite conventional K-Ar 31A "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 9.986 86 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12739 1 76.2 2.3 biotite conventional K-Ar 32 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 10.44 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12740 1 82.2 2.5 biotite conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 9.56 11.57 81 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12740 2 84.3 2.5 hornblende conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 0.635 0.789 70 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12741 1 74.1 2.2 biotite conventional K-Ar 34 "4.962E-04, 0.581E-04, 1.1167E-04" 8.55 9.313 72 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12742 1 83.2 2.5 biotite conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 10.67 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12743 1 69.4 2.1 biotite conventional K-Ar 36 "4.962E-04, 0.581E-04, 1.1167E-04" 9.06 9.223 80 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12744 1 71.8 2.2 biotite conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 8.97 9.454 92 A REDUCED AGE; AGE EFFECTED BY THERMAL EVENT(S) IN LATE CRETACEOUS OR EARLY TERTIARY 12745 1 63 1.9 biotite conventional K-Ar 38 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 8.509 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12746 1 70.8 2.1 biotite conventional K-Ar 39 "4.962E-04, 0.581E-04, 1.1167E-04" 9.14 9.498 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12747 1 69.6 2.1 biotite conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 8.9 9.098 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12747 2 75.8 2.3 hornblende conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 1.542 1.718 73 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12748 1 66.7 2 hornblende conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 1.49 1.457 80 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12748 2 66.3 2 hornblende conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 1.49 1.45 75 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12749 1 62.3 1.9 biotite conventional K-Ar 42 "4.962E-04, 0.581E-04, 1.1167E-04" 8.29 7.56 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12749 2 65.6 2 hornblende conventional K-Ar 42 "4.962E-04, 0.581E-04, 1.1167E-04" 1.25 1.202 79 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12750 1 60 1.8 biotite conventional K-Ar 43 "4.962E-04, 0.581E-04, 1.1167E-04" 9.18 8.067 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12751 1 72.8 2.2 biotite conventional K-Ar 44 "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 9.907 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12752 1 73 2.2 biotite conventional K-Ar 45 "4.962E-04, 0.581E-04, 1.1167E-04" 9.07 9.727 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12753 1 75.3 2.3 biotite conventional K-Ar 46 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 10.2 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12753 2 74.2 2.2 hornblende conventional K-Ar 46 "4.962E-04, 0.581E-04, 1.1167E-04" 1.267 1.383 68 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12754 1 68.3 2 biotite conventional K-Ar 47 "4.962E-04, 0.581E-04, 1.1167E-04" 8.21 8.228 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12755 1 70.5 2.1 biotite conventional K-Ar 48 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 9.53 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12756 1 74.5 2.2 biotite conventional K-Ar 49 "4.962E-04, 0.581E-04, 1.1167E-04" 9.32 10.21 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12757 1 71.4 2.1 biotite conventional K-Ar 50 "4.962E-04, 0.581E-04, 1.1167E-04" 9.43 9.891 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12757 2 67.1 3.4 hornblende conventional K-Ar 50 "4.962E-04, 0.581E-04, 1.1167E-04" 1.81 1.782 77 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12758 1 69.9 2.1 biotite conventional K-Ar 51 "4.962E-04, 0.581E-04, 1.1167E-04" 9.06 9.295 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12759 1 71 2.1 biotite conventional K-Ar 52 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 9.544 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12759 2 69 3.1 hornblende conventional K-Ar 52 "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 1.083 81 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12760 1 71.1 2.1 biotite conventional K-Ar 53 "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 9.485 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12761 1 70 2.1 biotite conventional K-Ar 54 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 9.453 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12761 2 66.5 2 hornblende conventional K-Ar 54 "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 0.8577 73 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12761 3 65.4 2 hornblende conventional K-Ar 54 "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 0.8432 74 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12762 1 70.5 2.8 biotite conventional K-Ar 55 "4.962E-04, 0.581E-04, 1.1167E-04" 8.05 8.337 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12762 2 70.7 2.8 biotite conventional K-Ar 55 "4.962E-04, 0.581E-04, 1.1167E-04" 8.05 8.361 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12763 1 69.3 2.8 biotite conventional K-Ar 56 "4.962E-04, 0.581E-04, 1.1167E-04" 8.41 8.558 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12764 1 70.1 2.1 biotite conventional K-Ar 57 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 9.526 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12765 1 65.3 2 hornblende conventional K-Ar 57A "4.962E-04, 0.581E-04, 1.1167E-04" 1.312 1.257 70 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12766 1 66.6 2 biotite conventional K-Ar 58 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5 9.284 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12767 1 67.2 2 biotite conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 9.03 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12767 2 73.9 2.2 hornblende conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 1.222 1.328 78 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12768 1 66.4 2 biotite conventional K-Ar 59A "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 8.093 87 A REDUCED AGE 12769 1 66.1 2 biotite conventional K-Ar 60 "4.962E-04, 0.581E-04, 1.1167E-04" 8.62 8.352 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12770 1 69.4 2 biotite conventional K-Ar 61 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 9.005 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12770 2 69.6 2.1 biotite conventional K-Ar 61 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 9.453 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12770 3 73.4 2.9 hornblende conventional K-Ar 61 "4.962E-04, 0.581E-04, 1.1167E-04" 0.984 1.062 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12771 1 69.5 2.1 biotite conventional K-Ar 62 "4.962E-04, 0.581E-04, 1.1167E-04" 8.88 9.057 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12772 1 69.4 2.1 biotite conventional K-Ar 63 "4.962E-04, 0.581E-04, 1.1167E-04" 9.24 9.408 86 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12773 1 81.3 2.4 biotite conventional K-Ar 64 "4.962E-04, 0.581E-04, 1.1167E-04" 9.33 11.17 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12774 1 79.9 2.4 biotite conventional K-Ar 65 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 10.88 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12775 1 72.4 2.9 biotite conventional K-Ar 66 "4.962E-04, 0.581E-04, 1.1167E-04" 9.4 10 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12776 1 140 5.6 hornblende conventional K-Ar 67 "4.962E-04, 0.581E-04, 1.1167E-04" 1.436 3.003 81 age not evaluated 12777 1 73.8 2.2 biotite conventional K-Ar 68 "4.962E-04, 0.581E-04, 1.1167E-04" 9.51 10.31 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12778 1 72.2 2.2 biotite conventional K-Ar 69 "4.962E-04, 0.581E-04, 1.1167E-04" 8.85 9.384 80 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12779 1 71.5 3.6 biotite conventional K-Ar 70 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5 9.97 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12780 1 72.4 2.2 biotite conventional K-Ar 71 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 9.516 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12781 1 83.4 2.5 biotite conventional K-Ar 72 "4.962E-04, 0.581E-04, 1.1167E-04" 8.71 10.71 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12781 2 169 11.8 hornblende conventional K-Ar 72 "4.962E-04, 0.581E-04, 1.1167E-04" 0.521 1.328 68 A REDUCED AGE 12782 1 86 2.6 biotite conventional K-Ar 73 "4.962E-04, 0.581E-04, 1.1167E-04" 8.92 11.31 91 PLUTON IS PROBABLY 75 M.Y. OLD 12783 1 76.1 2.3 biotite conventional K-Ar 73A "4.962E-04, 0.581E-04, 1.1167E-04" 9.19 10.28 88 age of intrusion 12784 1 74.8 2.2 biotite conventional K-Ar 73B "4.962E-04, 0.581E-04, 1.1167E-04" 8.86 9.742 88 minimum age of intrusion 12784 2 69.4 2.1 hornblende conventional K-Ar 73B "4.962E-04, 0.581E-04, 1.1167E-04" 0.632 0.6434 49 PLUTON IS PROBABLY 75 M.Y. OLD 12784 3 71.8 2.2 hornblende conventional K-Ar 73B "4.962E-04, 0.581E-04, 1.1167E-04" 0.632 0.6597 10 PLUTON IS PROBABLY 75 M.Y. OLD 12785 1 99.2 3 biotite conventional K-Ar 73C "4.962E-04, 0.581E-04, 1.1167E-04" 8.88 13.31 82 PLUTON IS THOUGHT TO BE 75 M.Y. OLD 12786 1 116 3.5 biotite conventional K-Ar 73D "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 15.88 55 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12786 2 199 6 hornblende conventional K-Ar 73D "4.962E-04, 0.581E-04, 1.1167E-04" 0.459 1.391 71 minimum age of intrusion 12787 1 73.7 2.2 biotite conventional K-Ar 74 "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 9.472 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12788 1 87.3 2.6 biotite conventional K-Ar 75 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 11.91 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12789 1 106 3.2 biotite conventional K-Ar 76 "4.962E-04, 0.581E-04, 1.1167E-04" 9.35 14.68 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12789 2 186 5.6 hornblende conventional K-Ar 76 "4.962E-04, 0.581E-04, 1.1167E-04" 0.704 1.985 77 minimum age of intrusion 12790 1 74.9 2.3 biotite conventional K-Ar 76A "4.962E-04, 0.581E-04, 1.1167E-04" 9.04 9.66 74 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12791 1 75 2.3 biotite conventional K-Ar 77 "4.962E-04, 0.581E-04, 1.1167E-04" 8.89 9.803 79 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12792 1 77.7 2.3 biotite conventional K-Ar 78 "4.962E-04, 0.581E-04, 1.1167E-04" 9.25 10.58 78 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12793 1 145 4.3 biotite conventional K-Ar 78A "4.962E-04, 0.581E-04, 1.1167E-04" 9.34 20.26 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12793 2 170 5.1 hornblende conventional K-Ar 78A "4.962E-04, 0.581E-04, 1.1167E-04" 0.43 1.105 47 minimum age of intrusion 12794 1 134 4 biotite conventional K-Ar 78B "4.962E-04, 0.581E-04, 1.1167E-04" 9.11 18.18 95 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12795 1 99.6 4 biotite conventional K-Ar 78C "4.962E-04, 0.581E-04, 1.1167E-04" 9 13.27 39 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12795 2 167 5 hornblende conventional K-Ar 78C "4.962E-04, 0.581E-04, 1.1167E-04" 0.855 2.152 87 minimum age of intrusion 12796 1 96.1 4.8 hornblende conventional K-Ar 79 "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 1.705 79 A REDUCED AGE 12797 1 78 2.3 biotite conventional K-Ar 79A "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 10.57 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12797 2 185 5.6 hornblende conventional K-Ar 79A "4.962E-04, 0.581E-04, 1.1167E-04" 0.898 2.524 87 minimum age of intrusion 12798 1 71.2 2.1 biotite conventional K-Ar 79B "4.962E-04, 0.581E-04, 1.1167E-04" 9.19 9.605 57 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12799 1 70 2.1 biotite conventional K-Ar 80 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 9.468 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12800 1 74 2.2 biotite conventional K-Ar 81 "4.962E-04, 0.581E-04, 1.1167E-04" 9.04 9.825 86 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12801 1 70.2 2.1 biotite conventional K-Ar 82 "4.962E-04, 0.581E-04, 1.1167E-04" 9.51 9.8 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12801 2 72.2 2.2 hornblende conventional K-Ar 82 "4.962E-04, 0.581E-04, 1.1167E-04" 1.089 1.155 64 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12802 1 71 2.1 biotite conventional K-Ar 83 "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 9.66 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12803 1 70.8 2.1 biotite conventional K-Ar 84 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 9.04 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12804 1 82 2.5 biotite conventional K-Ar 85 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 11.07 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12804 2 126 3.8 hornblende conventional K-Ar 85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.644 1.211 82 11% PYROXENE WITH THE HORNBLENDE MAY BE A REDUCED AGE 12804 3 197 15.8 hornblende conventional K-Ar 85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.55 1.651 55 minimum age of intrusion 15% PYROXENE WITH THE HORNBLENDE 12805 1 71.1 2.1 biotite conventional K-Ar 86 "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 9.484 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12806 1 70.5 2.1 biotite conventional K-Ar 87 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 9.037 96 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12807 1 73.9 2.2 biotite conventional K-Ar 88 "4.962E-04, 0.581E-04, 1.1167E-04" 9.24 10.03 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12807 2 72.7 2.2 muscovite conventional K-Ar 88 "4.962E-04, 0.581E-04, 1.1167E-04" 10.64 11.37 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12808 1 69.7 2.1 biotite conventional K-Ar 89 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 9.369 95 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12808 2 74.9 2.2 hornblende conventional K-Ar 89 "4.962E-04, 0.581E-04, 1.1167E-04" 1.209 1.332 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12809 1 72.2 2.2 biotite conventional K-Ar 90 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 9.708 96 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12809 2 71.1 3.6 hornblende conventional K-Ar 90 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 1.003 76 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12810 1 70 2.1 biotite conventional K-Ar 91 "4.962E-04, 0.581E-04, 1.1167E-04" 9.35 9.603 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12811 1 71.5 2.1 biotite conventional K-Ar 92 "4.962E-04, 0.581E-04, 1.1167E-04" 9.42 9.89 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12811 2 70.5 3.5 hornblende conventional K-Ar 92 "4.962E-04, 0.581E-04, 1.1167E-04" 0.763 0.7901 64 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12812 1 68.4 2.1 biotite conventional K-Ar 93 "4.962E-04, 0.581E-04, 1.1167E-04" 9.3 9.333 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12813 1 70.7 2.1 biotite conventional K-Ar 94 "4.962E-04, 0.581E-04, 1.1167E-04" 9.83 10.2 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12813 2 69.5 2.1 muscovite conventional K-Ar 94 "4.962E-04, 0.581E-04, 1.1167E-04" 10.75 10.97 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12814 1 73.6 3.2 hornblende conventional K-Ar 95 "4.962E-04, 0.581E-04, 1.1167E-04" 1.156 1.25 73 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12815 1 68.5 2.1 biotite conventional K-Ar 96 "4.962E-04, 0.581E-04, 1.1167E-04" 9.48 9.534 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12816 1 68.4 2.1 biotite conventional K-Ar 97 "4.962E-04, 0.581E-04, 1.1167E-04" 9.27 9.301 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12817 1 68.3 2.1 biotite conventional K-Ar 98 "4.962E-04, 0.581E-04, 1.1167E-04" 8.75 8.768 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12818 1 74.3 3 biotite conventional K-Ar 99 "4.962E-04, 0.581E-04, 1.1167E-04" 9.52 10.39 88 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12819 1 149 4.5 biotite conventional K-Ar 100 "4.962E-04, 0.581E-04, 1.1167E-04" 9.44 21.1 97 minimum age of intrusion 12820 1 71.4 2.1 biotite conventional K-Ar 100A "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 9.389 79 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT 12821 1 76.4 2.3 biotite conventional K-Ar 101 "4.962E-04, 0.581E-04, 1.1167E-04" 8.87 9.969 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12821 2 73.6 5.9 hornblende conventional K-Ar 101 "4.962E-04, 0.581E-04, 1.1167E-04" 0.568 0.6146 59 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12822 1 80 2.4 biotite conventional K-Ar 102 "4.962E-04, 0.581E-04, 1.1167E-04" 9.31 10.97 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12823 1 80.4 2.4 biotite conventional K-Ar 102A "4.962E-04, 0.581E-04, 1.1167E-04" 9.48 11.28 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12823 2 163 4.9 hornblende conventional K-Ar 102A "4.962E-04, 0.581E-04, 1.1167E-04" 1.061 2.608 60 minimum age of intrusion 12824 1 74.2 2.2 biotite conventional K-Ar 103 "4.962E-04, 0.581E-04, 1.1167E-04" 9.17 9.994 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12825 1 75 2.3 biotite conventional K-Ar 104 "4.962E-04, 0.581E-04, 1.1167E-04" 9.34 10.3 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12826 1 69.9 2.1 biotite conventional K-Ar 105 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 9.143 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12826 2 72.4 2.9 hornblende conventional K-Ar 105 "4.962E-04, 0.581E-04, 1.1167E-04" 0.725 0.7707 20 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12827 1 68.9 2.1 biotite conventional K-Ar 106 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 9.327 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12828 1 67.6 2 biotite conventional K-Ar 107 "4.962E-04, 0.581E-04, 1.1167E-04" 8.87 8.792 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12828 2 69.2 2.1 hornblende conventional K-Ar 107 "4.962E-04, 0.581E-04, 1.1167E-04" 1.061 1.007 69 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12829 1 70.1 2.1 biotite conventional K-Ar 108 "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 9.215 92 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12829 2 72.9 2.9 hornblende conventional K-Ar 108 "4.962E-04, 0.581E-04, 1.1167E-04" 0.926 0.9916 48 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12830 1 65 2 biotite conventional K-Ar 109 "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 8.817 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12831 1 66.2 2 biotite conventional K-Ar 110 "4.962E-04, 0.581E-04, 1.1167E-04" 9.64 9.354 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12832 1 69.5 2.8 biotite conventional K-Ar 111 "4.962E-04, 0.581E-04, 1.1167E-04" 9.01 9.187 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12832 2 71 2.1 muscovite conventional K-Ar 111 "4.962E-04, 0.581E-04, 1.1167E-04" 10.69 11.14 89 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12833 1 72.1 2.2 biotite conventional K-Ar 112 "4.962E-04, 0.581E-04, 1.1167E-04" 9.07 9.601 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12833 2 73.6 2.2 hornblende conventional K-Ar 112 "4.962E-04, 0.581E-04, 1.1167E-04" 1.059 1.145 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12834 1 59.1 1.8 biotite conventional K-Ar 112A "4.962E-04, 0.581E-04, 1.1167E-04" 8.92 7.716 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12835 1 68 2 biotite conventional K-Ar 113 "4.962E-04, 0.581E-04, 1.1167E-04" 9.48 9.451 54 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12836 1 71.6 2.1 biotite conventional K-Ar 114 "4.962E-04, 0.581E-04, 1.1167E-04" 9.62 10.12 96 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12837 1 69.2 2.1 biotite conventional K-Ar 115 "4.962E-04, 0.581E-04, 1.1167E-04" 9.12 9.264 84 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12838 1 70 2.1 biotite conventional K-Ar 116 "4.962E-04, 0.581E-04, 1.1167E-04" 9.29 9.55 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12839 1 70.1 2.1 biotite conventional K-Ar 116A "4.962E-04, 0.581E-04, 1.1167E-04" 9.15 9.412 91 A REDUCED AGE; GNEISS IS PROBABLY PRECAMBRIAN IN AGE 12840 1 69.7 2.1 biotite conventional K-Ar 117 "4.962E-04, 0.581E-04, 1.1167E-04" 9.15 9.358 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12841 1 70.1 2.1 biotite conventional K-Ar 118 "4.962E-04, 0.581E-04, 1.1167E-04" 9.11 9.381 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12842 1 72.6 2.2 biotite conventional K-Ar 119 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 9.546 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12843 1 70.5 2.1 biotite conventional K-Ar 120 "4.962E-04, 0.581E-04, 1.1167E-04" 9.18 9.499 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12844 1 67.7 2 biotite conventional K-Ar 121 "4.962E-04, 0.581E-04, 1.1167E-04" 9.06 9.003 86 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12845 1 71.5 2.1 biotite conventional K-Ar 122 "4.962E-04, 0.581E-04, 1.1167E-04" 9.52 9.996 91 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12846 1 80.7 3.2 biotite conventional K-Ar 123 "4.962E-04, 0.581E-04, 1.1167E-04" 9.13 10.85 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12847 1 116 3.5 biotite conventional K-Ar 123A "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 15.65 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12847 2 178 5.3 hornblende conventional K-Ar 123A "4.962E-04, 0.581E-04, 1.1167E-04" 0.564 15.15 63 minimum age of intrusion 12848 1 154 4.6 biotite conventional K-Ar 123B "4.962E-04, 0.581E-04, 1.1167E-04" 9.37 21.66 86 GRANODIORITE IS AT LEAST 175 M.Y. OLD 12848 2 168 5 hornblende conventional K-Ar 123B "4.962E-04, 0.581E-04, 1.1167E-04" 0.517 1.312 38 minimum age of intrusion 12849 1 71.5 2.1 biotite conventional K-Ar 124 "4.962E-04, 0.581E-04, 1.1167E-04" 9.72 10.21 87 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12850 1 68.2 2 biotite conventional K-Ar 125 "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 9.264 82 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12850 2 73.1 3.7 hornblende conventional K-Ar 125 "4.962E-04, 0.581E-04, 1.1167E-04" 0.916 0.9844 77 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12851 1 72.3 2.2 biotite conventional K-Ar 126 "4.962E-04, 0.581E-04, 1.1167E-04" 9.28 9.862 93 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12852 1 71 2.1 biotite conventional K-Ar 127 "4.962E-04, 0.581E-04, 1.1167E-04" 9.6 10.01 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12852 2 71.5 2.1 hornblende conventional K-Ar 127 "4.962E-04, 0.581E-04, 1.1167E-04" 0.727 0.7633 60 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12853 1 74.4 2.2 biotite conventional K-Ar 128 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 10.08 77 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12853 2 131 3.9 hornblende conventional K-Ar 128 "4.962E-04, 0.581E-04, 1.1167E-04" 0.769 1.502 72 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12854 1 68.1 2 biotite conventional K-Ar 129 "4.962E-04, 0.581E-04, 1.1167E-04" 9.1 9.094 90 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12854 2 71.2 2.1 muscovite conventional K-Ar 129 "4.962E-04, 0.581E-04, 1.1167E-04" 10.75 11.24 95 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12855 1 94.6 2.8 biotite conventional K-Ar 130 "4.962E-04, 0.581E-04, 1.1167E-04" 9.37 13.1 96 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12856 1 74 2.2 biotite conventional K-Ar 131 "4.962E-04, 0.581E-04, 1.1167E-04" 9.56 10.4 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12857 1 109 3.3 biotite conventional K-Ar 132 "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 14.6 85 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12858 1 78.5 2.4 biotite conventional K-Ar 133 "4.962E-04, 0.581E-04, 1.1167E-04" 9.31 10.75 94 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12858 2 109 6.5 hornblende conventional K-Ar 133 "4.962E-04, 0.581E-04, 1.1167E-04" 0.996 1.608 74 PROBABLY A REDUCED AGE 12859 1 126 3.8 biotite conventional K-Ar 133A "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 17.35 95 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12859 2 166 5 hornblende conventional K-Ar 133A "4.962E-04, 0.581E-04, 1.1167E-04" 0.649 1.628 63 minimum age of intrusion 12860 1 122 5.4 biotite conventional K-Ar 134 "4.962E-04, 0.581E-04, 1.1167E-04" 8.86 16.05 96 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12861 1 154 4.6 biotite conventional K-Ar 135 "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 21.62 95 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12862 1 163 4.9 biotite conventional K-Ar 136 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 21.31 97 minimum age of intrusion 12862 2 162 4.9 hornblende conventional K-Ar 136 "4.962E-04, 0.581E-04, 1.1167E-04" 0.635 1.551 69 minimum age of intrusion 12863 1 148 4.4 biotite conventional K-Ar 136A "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 19.59 83 A REDUCED AGE; THE K-AR ISOTOPIC SYSTEM OF THIS MINERAL HAS BEEN DISTURBED BY A THERMAL EVENT(S) 12863 2 183 5.5 hornblende conventional K-Ar 136A "4.962E-04, 0.581E-04, 1.1167E-04" 0.472 1.312 56 minimum age of intrusion 12997 1 75.39 1.06 hornblende 39Ar-40Ar incremental (plateau) D1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE, SEE ARTICLE FOR ANALYTICAL DATA" 12997 2 74.68 1.15 biotite 39Ar-40Ar incremental (plateau) D1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE, FOR ANALYTICAL DATA, SEE ARTICLE" 12998 1 78.27 0.47 hornblende 39Ar-40Ar incremental (plateau) D2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, SEE ARTICLE" 12998 2 73.92 0.27 biotite 39Ar-40Ar incremental (plateau) D2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU AGE; FOR ANALYTICAL DATA, SEE ARTICLE" 12999 1 79.98 0.86 hornblende 39Ar-40Ar incremental (plateau) D3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, SEE ARTICLE" 13000 1 87.51 1.86 hornblende 39Ar-40Ar incremental (plateau) D4 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, SEE ARTICLE" 13001 1 96.54 hornblende 39Ar-40Ar total fusion P2 "4.962E-04, 0.581E-04, 1.1167E-04" "40AR/39AR TOTAL GAS DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" SPURIOUS DATE 13002 1 79.88 0.77 hornblende 39Ar-40Ar incremental (plateau) P3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13002 2 75.84 0.96 biotite 39Ar-40Ar incremental (plateau) P3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13003 1 110.1 hornblende 39Ar-40Ar total fusion P4 "4.962E-04, 0.581E-04, 1.1167E-04" "40AR/39AR TOTAL-GAS DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" SPURIOUS AGE 13004 1 72.45 0.7 hornblende 39Ar-40Ar incremental (plateau) SM1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13004 2 69.1 0.47 biotite 39Ar-40Ar incremental (plateau) SM1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13005 1 72.89 0.71 hornblende 39Ar-40Ar incremental (plateau) SM2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13005 2 69.14 0.26 biotite 39Ar-40Ar incremental (plateau) SM2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13006 1 72.06 1.07 hornblende 39Ar-40Ar incremental (plateau) FR1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13006 2 68.79 0.38 biotite 39Ar-40Ar incremental (plateau) FR1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13007 1 70.22 0.43 hornblende 39Ar-40Ar incremental (plateau) PH-3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13007 2 65.7 0.8 biotite 39Ar-40Ar incremental (plateau) PH3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13008 1 70.36 0.62 hornblende 39Ar-40Ar incremental (plateau) PH2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13008 2 65.71 0.33 biotite 39Ar-40Ar incremental (plateau) PH2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13009 1 74.88 1.03 hornblende 39Ar-40Ar incremental (plateau) VP6 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13010 1 81.09 hornblende 39Ar-40Ar total fusion P5 "4.962E-04, 0.581E-04, 1.1167E-04" "40AR/39AR TOTAL-GAS DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" TOTAL-GAS DATE APPEARS TOO OLD 13010 2 72.71 0.7 biotite 39Ar-40Ar incremental (plateau) P5 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13011 1 76.08 0.32 hornblende 39Ar-40Ar incremental (plateau) VP3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13012 1 71.09 1.73 biotite 39Ar-40Ar incremental (plateau) VP2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13013 1 71.46 0.59 biotite 39Ar-40Ar incremental (plateau) A1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13014 1 73.43 0.64 biotite 39Ar-40Ar incremental (plateau) P6 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13014 2 74.86 0.19 hornblende 39Ar-40Ar incremental (plateau) P6 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13015 1 71.14 0.76 biotite 39Ar-40Ar incremental (plateau) TA1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13016 1 71.59 0.21 hornblende 39Ar-40Ar incremental (plateau) P7A "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13016 2 69.9 0.37 biotite 39Ar-40Ar incremental (plateau) P7A "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13017 1 71.41 0.73 hornblende 39Ar-40Ar incremental (plateau) P7B "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13017 2 69.06 0.69 biotite 39Ar-40Ar incremental (plateau) P7B "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13018 1 71.88 0.24 hornblende 39Ar-40Ar incremental (plateau) TM16 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13018 2 69.25 0.44 biotite 39Ar-40Ar incremental (plateau) TM16 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13019 1 70.98 0.48 hornblende 39Ar-40Ar incremental (plateau) P9 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13019 2 68.21 0.42 biotite 39Ar-40Ar incremental (plateau) P9 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13020 1 70.57 0.9 hornblende 39Ar-40Ar incremental (plateau) OL1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13020 2 68.37 0.33 biotite 39Ar-40Ar incremental (plateau) OL1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13021 1 68.28 0.47 biotite 39Ar-40Ar incremental (plateau) P10 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13022 1 69.08 0.43 biotite 39Ar-40Ar incremental (plateau) P11 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13023 1 70.65 0.44 hornblende 39Ar-40Ar incremental (plateau) STM2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13023 2 66.84 0.34 biotite 39Ar-40Ar incremental (plateau) STM2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13024 1 67.22 0.13 biotite 39Ar-40Ar incremental (plateau) STM1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13025 1 64.01 12 biotite STM3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated 13026 1 68.84 0.25 biotite 39Ar-40Ar incremental (plateau) P12 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13027 1 70.32 0.59 biotite 39Ar-40Ar incremental (plateau) TA2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13028 1 66.04 0.7 biotite 39Ar-40Ar incremental (plateau) STM4 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13029 1 66.8 0.42 biotite 39Ar-40Ar incremental (plateau) OL2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13030 1 60.58 0.36 biotite 39Ar-40Ar incremental (plateau) PR1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13031 1 66.72 0.24 biotite 39Ar-40Ar incremental (plateau) P13 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13032 1 66.72 biotite 39Ar-40Ar total fusion TM14A "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR TOTAL-GAS DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13033 1 65.39 0.8 muscovite 39Ar-40Ar total fusion S1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR TOTAL-GAS DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13034 1 67.21 0.8 muscovite 39Ar-40Ar incremental (plateau) PH1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13034 2 61.28 0.55 biotite 39Ar-40Ar incremental (plateau) PH1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13035 1 89.59 1.39 hornblende 39Ar-40Ar incremental (plateau) WR1A "4.962E-04, 0.581E-04, 1.1167E-04" "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" PROBABLY A SPURIOUS DATE 13035 2 76.71 1.01 biotite 39Ar-40Ar incremental (plateau) WR1A "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13036 1 92.8 3.95 hornblende 39Ar-40Ar incremental (plateau) WR1B "4.962E-04, 0.581E-04, 1.1167E-04" "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" SPURIOUS DATE 13036 2 75.56 0.94 biotite 39Ar-40Ar incremental (plateau) WR1B "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13037 1 72.18 biotite 39Ar-40Ar total fusion MCCARTNEY MOUNTAIN "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR TOTAL-GAS DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13038 1 72.64 1.16 hornblende 39Ar-40Ar incremental (plateau) MM1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.805 0.858 90 age not evaluated 13038 2 67.26 0.94 biotite conventional K-Ar MM1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.482 9.8526 95 age not evaluated 13039 1 69.92 0.88 hornblende conventional K-Ar TM7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.789 0.8099 74 age not evaluated 13039 2 65.44 0.86 biotite conventional K-Ar TM7 "4.962E-04, 0.581E-04, 1.1167E-04" 9.324 8.9438 89 age not evaluated 13040 1 70.82 1.73 hornblende conventional K-Ar TM8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.571 0.5933 40 age not evaluated 13040 2 70.37 3.07 biotite conventional K-Ar TM8 "4.962E-04, 0.581E-04, 1.1167E-04" 7.216 6.956 38 age not evaluated 13041 1 67.94 1.17 biotite conventional K-Ar TM9 "4.962E-04, 0.581E-04, 1.1167E-04" 6.661 6.6375 92 age not evaluated 13042 1 75.38 0.88 hornblende conventional K-Ar TM12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.843 0.9342 89 age not evaluated 13042 2 68.49 0.9 biotite conventional K-Ar TM12 "4.962E-04, 0.581E-04, 1.1167E-04" 9.269 9.3119 90 age not evaluated 13043 1 67.99 0.78 biotite conventional K-Ar TM13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 8.6157 88 age not evaluated 13044 1 72.53 1.05 biotite conventional K-Ar VP1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.263 8.8015 86 age not evaluated 13045 1 97.55 7.05 hornblende 39Ar-40Ar incremental (plateau) P1 "4.962E-04, 0.581E-04, 1.1167E-04" "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" AGE IS TOO OLD 13045 2 116.2 1.42 hornblende conventional K-Ar P1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.518 0.9017 77 K=0.430% SPURIOUS DATE 13046 1 68.65 0.49 biotite 39Ar-40Ar incremental (plateau) TM11 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13046 2 69.49 1.13 biotite conventional K-Ar TM11 "4.962E-04, 0.581E-04, 1.1167E-04" 8.717 8.8892 86 age not evaluated K=7.236% 13047 1 68.23 1.59 biotite 39Ar-40Ar incremental (plateau) TM10 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13047 2 66.46 1.07 biotite conventional K-Ar TM10 "4.962E-04, 0.581E-04, 1.1167E-04" 7.953 7.7504 78 age not evaluated K=6.602% 13048 1 68.86 0.61 biotite 39Ar-40Ar incremental (plateau) TM1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13048 2 66.07 0.77 biotite conventional K-Ar TM1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.162 8.8671 91 age not evaluated AVERAGE OF 2 ANALYSES IS 66.93+/-0.81 M.Y. 13048 3 67.78 0.84 biotite conventional K-Ar TM1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.162 9.1017 92 age not evaluated AVERAGE OF 2 ANALYSES IS 66.93+/-0.81 M.Y. 13049 1 67.48 0.46 biotite 39Ar-40Ar incremental (plateau) TM3 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13049 2 66.08 0.74 biotite conventional K-Ar TM3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.112 7.8531 91 age not evaluated 13050 1 69.36 1.11 biotite 39Ar-40Ar incremental (plateau) TM2 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13050 2 68.61 0.77 biotite conventional K-Ar TM2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.027 9.079 93 age not evaluated AVERAGE OF 2 ANALYSES IS 68.51+/-0.80 M.Y. 13050 3 68.4 0.83 biotite conventional K-Ar TM2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.1 9.1235 96 age not evaluated AVERAGE OF 2 ANALYSES IS 68.51+/-0.80 M.Y. 13051 1 68.19 1.03 biotite 39Ar-40Ar incremental (plateau) TM14B "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated "40AR/39AR PLATEAU DATE; FOR ANALYTICAL DATA, REFER TO ARTICLE" 13051 2 68.38 0.83 biotite conventional K-Ar TM14 "4.962E-04, 0.581E-04, 1.1167E-04" 7.942 7.9664 88 age not evaluated 13052 1 3.73 whole rock conventional K-Ar 826-13B "4.72E-04, 0.585E-04, 1.19E-04" 0.0355 13 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.534, 0.535%" 13053 1 4.05 whole rock conventional K-Ar 820-23 "4.72E-04, 0.585E-04, 1.19E-04" 0.07 16 age of volcanism LESS THAN 10% GLASS PRESENT "K=1.010, 0.970%" 13054 1 4.06 whole rock conventional K-Ar 820-232 "4.72E-04, 0.585E-04, 1.19E-04*" 1.196 0.0699 79 age of volcanism LESS THAN 10% GLASS PRESENT K=0.993% 13055 1 4.38 whole rock conventional K-Ar 821-11 "4.72E-04, 0.585E-04, 1.19E-04" 0.0325 6 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.422, 0.411%" 13056 1 4.56 whole rock conventional K-Ar 831-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.0712 17 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.877, 0.870%" 13057 1 4.49 whole rock conventional K-Ar 831-15 "4.72E-04, 0.585E-04, 1.19E-04" 0.0714 21 age of volcanism LESS THAN 10% GLASS PRESENT "K=0.893, 0.887%" 13058 1 25.7 0.8 plagioclase conventional K-Ar 1. CSP-17 "4.72E-04, 0.584E-04, 1.19E-04" 2.01 88 age of intrusion K=1.67% "ARMSTRONG, 1969, REPORTED AN AGE OF 39.5 M.Y. FOR APPARENTLY THE SAME INTRUSION. HIS AGE SEEMS TOO OLD." 13059 1 24.7 0.8 biotite conventional K-Ar 2. 855-525 "4.72E-04, 0.584E-04, 1.19E-04" 8.12 68 age of intrusion K=6.74% 13060 1 23.4 1 biotite conventional K-Ar 3. 855-432 "4.72E-04, 0.584E-04, 1.19E-04" 8.96 31 age of intrusion K=7.44% 13061 1 21.7 1 biotite conventional K-Ar 4. 855-514 "4.72E-04, 0.584E-04, 1.19E-04" 9.14 55 age of intrusion K=7.59% 13062 1 3.5 0.2 whole rock conventional K-Ar 7. 855-293 "4.72E-04, 0.584E-04, 1.19E-04" 0.89 43 age of volcanism K=0.74% 13063 1 4.7 0.3 plagioclase conventional K-Ar 12. 855-357 "4.72E-04, 0.584E-04, 1.19E-04" 2.6 45 age of volcanism K=2.16% 13064 1 3.3 0.3 whole rock conventional K-Ar 13. 855-343 "4.72E-04, 0.584E-04, 1.19E-04" 0.84 17 age of volcanism K=0.70% 13065 1 2.2 0.3 whole rock conventional K-Ar 9. 855-153 "4.72E-04, 0.584E-04, 1.19E-04" 0.89 12 age of volcanism K=0.74% 13066 1 1.9 0.05 whole rock conventional K-Ar 10. 855-112 "4.72E-04, 0.584E-04, 1.19E-04" 2.9 29 age of volcanism K=2.41% 13067 1 2.5 0.8 plagioclase conventional K-Ar 8. 855-133 "4.72E-04, 0.584E-04, 1.19E-04" 1.04 14 age of volcanism K=0.86% 13068 1 8.2 0.8 hornblende conventional K-Ar 5. 855-277 "4.72E-04, 0.584E-04, 1.19E-04" 0.55 23 age of volcanism K=0.46% 13069 1 1.8 0.1 whole rock conventional K-Ar 11. 855-176 "4.72E-04, 0.584E-04, 1.19E-04" 1.39 19 age of volcanism K=1.15% 13070 1 7.2 0.3 plagioclase conventional K-Ar 6. 855-117 "4.72E-04, 0.584E-04, 1.19E-04" 1.95 64 age of volcanism K=1.62% 13071 1 133.29 4 biotite conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.22 14.38 89 age of intrusion 13071 2 141.46 5 hornblende conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.35 2.86 91 age of intrusion 13072 1 81.95 4 biotite conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04*" 9.03 10.9 87 age of intrusion 13073 1 79.18 2 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04*" 8.77 10.22 83 age of intrusion 13074 1 156.26 4 biotite conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04*" 6.4 15.04 86 minimum age of intrusion 13075 1 154.83 4 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.67 20.18 76 PLUTON IS PROBABLY 170 M.Y. OLD 13075 2 160.83 4 hornblende conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 1.47 3.56 94 PLUTON IS PROBABLY 170 M.Y. OLD 13076 1 173.74 5 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04*" 6.6 17.33 70 age of intrusion 13077 1 165.65 4 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 6.75 16.86 85 PLUTON IS PROBABLY 170 M.Y. OLD 13078 1 174.96 5 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 6.93 18.33 96 PRIMARY AGE IS PROBABLY AROUND 180 M.Y. 13078 2 171.9 4 hornblende conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04*" 1.19 3.09 90 PRIMARY AGE IS PROBABLY AROUND 180 M.Y. 13079 1 182.42 4 hornblende conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 3.04 93 age of intrusion 13080 1 171.71 4 biotite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 7.75 20.1 96 PRIMARY AGE IS PROBABLY AROUND 180 M.Y. 13080 2 188.78 5 hornblende conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.89 2.55 92 age of intrusion 13081 1 178.65 5 hornblende conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04*" 0.81 2.19 93 age of intrusion 13082 1 126.65 7 augite-ferroaugite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 0.09 0.17 51 AGE IS TOO YOUNG 13082 2 167.08 4 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 9.34 23.54 92 PLUTON IS PROBABLY AROUND 170 M.Y. OLD 13083 1 174.94 4 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04*" 9.26 24.49 94 age of intrusion 13084 1 92 3 biotite conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 7.45 10.12 89 age of metamorphic crystallization 13085 1 75.39 4 biotite conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04*" 9.14 10.13 82 age of intrusion 13086 1 90.83 6 biotite conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04*" 8.15 10.93 39 age of metamorphic crystallization 13087 1 92.67 5 biotite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 7.48 10.24 71 age of intrusion 13087 2 121.29 9 microcline conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04*" 11.87 21.44 68 AGE APPEARS TO BE TOO OLD 13088 1 91.23 8 microcline conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04*" 13.65 18.39 93 minimum age of intrusion 13089 1 122.49 8 microcline conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04*" 12.55 22.9 93 minimum age of intrusion 13090 1 148.81 7 phlogopite conventional K-Ar 20 "4.72E-04, 0.585E-04, 1.19E-04*" 10.5 23.45 89 age of metamorphic crystallization 13091 1 114.99 7 microcline conventional K-Ar 21 "4.72E-04, 0.585E-04, 1.19E-04*" 12.8 21.88 92 minimum age of intrusion 13092 1 89.59 6 microcline conventional K-Ar 22 "4.72E-04, 0.585E-04, 1.19E-04*" 9.15 12.1 92 minimum age of intrusion 13093 1 83.14 9 microcline conventional K-Ar 23 "4.72E-04, 0.585E-04, 1.19E-04*" 10.62 13.01 89 minimum age of intrusion 13094 1 90.91 10 microcline conventional K-Ar 24 "4.72E-04, 0.585E-04, 1.19E-04*" 5.2 6.98 67 "LOW AGE, MATERIAL MAY COME FROM A TRIASSIC, XENOLITHIC BODY" 13095 1 98.63 9 microcline conventional K-Ar 25 "4.72E-04, 0.585E-04, 1.19E-04*" 10.99 16.04 87 minimum age of intrusion 13096 1 216.75 6 hornblende conventional K-Ar 26 "4.72E-04, 0.585E-04, 1.19E-04*" 1.14 3.78 84 "ROCK MAY BE A TRIASSIC, XENOLITHIC BODY" 13101 1 35 1.1 biotite conventional K-Ar AS-5 no decay constants given 7574 age of intrusion "K=6.62, 6.58%" 13104 1 34.3 1 biotite conventional K-Ar MAY-1B no decay constants given 6868 age of intrusion "K=6.03, 6.07%" 13105 1 34.1 1 biotite conventional K-Ar 2-May no decay constants given 7277 age of intrusion "K=6.12, 6.02%" 13106 1 35.4 1.1 biotite conventional K-Ar 3-May no decay constants given 6967 age of intrusion "K=6.88, 6.97%" 13108 1 31.6 0.9 biotite conventional K-Ar DE-5 no decay constants given 7.91 7074 minimum age of intrusion K=6.57% 13113 1 36 1.1 biotite conventional K-Ar AL-11 no decay constants given 6.48 6871 age of intrusion K=5.38% 13120 1 33.9 1 biotite conventional K-Ar CO-4 no decay constants given 8184 age of intrusion "K=7.13, 6.74%" 13123 1 115.72 biotite conventional K-Ar CL-1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.73 13.3 79 minimum age of intrusion K=6.42% 13123 2 124.09 hornblende conventional K-Ar CL-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.89 1.646 83 age of intrusion K=0.74% 13124 1 98.88 biotite conventional K-Ar WV-1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.44 12.35 85 K=7.01% A REDUCED AGE 13124 2 119.07 hornblende conventional K-Ar WV-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.737 1.306 74 age of intrusion K=0.612% 13125 1 90.8 biotite conventional K-Ar SL-36 "4.72E-04, 0.584E-04, 1.19E-04*" 7.22 9.68 84 K=5.99% A REDUCED AGE 13126 1 90.76 biotite conventional K-Ar SL-32 "4.72E-04, 0.584E-04, 1.19E-04*" 8.44 11.31 82 K=7.01% A REDUCED AGE 13126 2 110.64 hornblende conventional K-Ar SL-32 "4.72E-04, 0.584E-04, 1.19E-04*" 0.75 1.232 69 minimum age of intrusion K=0.62% 13127 1 92 biotite conventional K-Ar SL-25 "4.72E-04, 0.584E-04, 1.19E-04*" 8.5 11.55 84 K=7.06% A REDUCED AGE 13128 1 93.9 biotite conventional K-Ar SL-18 "4.72E-04, 0.584E-04, 1.19E-04*" 9.13 12.67 88 K=7.58% A REDUCED AGE 13128 2 93.32 hornblende conventional K-Ar SL-18 "4.72E-04, 0.584E-04, 1.19E-04*" 0.95 1.31 82 K=0.79% A REDUCED AGE 13129 1 84.89 biotite conventional K-Ar BCC-13 "4.72E-04, 0.584E-04, 1.19E-04*" 7.2 9.01 75 K=5.98% A REDUCED AGE 13129 2 94.5 hornblende conventional K-Ar BCC-13 "4.72E-04, 0.584E-04, 1.19E-04*" 0.92 1.285 70 K=0.76% A REDUCED AGE 13130 1 87.38 biotite conventional K-Ar BCC-14 "4.72E-04, 0.584E-04, 1.19E-04*" 6.47 8.34 20 K=5.37% A REDUCED AGE 13131 1 84.74 biotite conventional K-Ar HL-9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.99 11.23 76 K=7.46% A REDUCED AGE 13131 2 90.42 hornblende conventional K-Ar HL-9 "4.72E-04, 0.584E-04, 1.19E-04*" 1 1.335 78 K=0.83% A REDUCED AGE 13132 1 90.19 biotite conventional K-Ar KP-12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.93 11.89 69 K=7.41% A REDUCED AGE 13133 1 84.07 biotite conventional K-Ar HL-4 "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 10.63 85 minimum age of intrusion K=7.41% 13134 1 85.21 biotite conventional K-Ar HL-29 "4.72E-04, 0.584E-04, 1.19E-04*" 8.16 10.25 57 minimum age of intrusion K=6.77% 13135 1 89.17 biotite conventional K-Ar BCC-12 "4.72E-04, 0.584E-04, 1.19E-04*" 8.26 10.87 86 age of intrusion K=6.86% 13135 2 87.78 hornblende conventional K-Ar BCC-12 "4.72E-04, 0.584E-04, 1.19E-04*" 0.61 0.79 74 age of intrusion K=0.51% 13136 1 86.76 biotite conventional K-Ar BCA-20 "4.72E-04, 0.584E-04, 1.19E-04*" 8.55 10.94 58 age of intrusion K=7.10% 13136 2 89.15 hornblende conventional K-Ar BCA-20 "4.72E-04, 0.584E-04, 1.19E-04*" 0.76 1 78 age of intrusion K=0.63% 13137 1 83.57 biotite conventional K-Ar KP-5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.6 10.59 83 minimum age of intrusion K=7.14% 13138 1 87.57 biotite conventional K-Ar BCB-53 "4.72E-04, 0.584E-04, 1.19E-04*" 8.02 10.36 81 minimum age of intrusion K=6.66% 13139 1 78.82 biotite conventional K-Ar MG-1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.32 9.65 44 K=6.91% PROBABLY A REDUCED AGE 13139 2 85.74 hornblende conventional K-Ar MG-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.81 1.024 78 minimum age of intrusion K=0.67% 13140 1 77.93 biotite conventional K-Ar MG-2 "4.72E-04, 0.584E-04, 1.19E-04*" 8.53 9.78 32 age of intrusion K=7.08% 13141 1 76.48 biotite conventional K-Ar MT-5 "4.72E-04, 0.584E-04, 1.19E-04*" 8.58 9.65 90 age of intrusion K=7.12% 13142 1 75.94 biotite conventional K-Ar MT-6 "4.72E-04, 0.584E-04, 1.19E-04*" 8.06 9 91 age of intrusion K=6.69% 13143 1 89.18 biotite conventional K-Ar MT-2 "4.72E-04, 0.584E-04, 1.19E-04*" 8.54 11.24 85 age of intrusion K=7.09% 13143 2 86.84 hornblende conventional K-Ar MT-2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.73 0.935 72 age of intrusion K=0.61% 13144 1 82.3 biotite conventional K-Ar MT-1 "4.72E-04, 0.584E-04, 1.19E-04*" 8.1 9.82 61 K=6.72% A REDUCED AGE 13145 1 71.08 biotite conventional K-Ar MT-3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.46 8.83 82 K=7.02% A REDUCED AGE 13145 2 98.41 hornblende conventional K-Ar MT-3 "4.72E-04, 0.584E-04, 1.19E-04*" 1.23 1.791 80 K=1.02% PROBABLY A REDUCED AGE 13146 1 80.97 biotite conventional K-Ar MT-4 "4.72E-04, 0.584E-04, 1.19E-04*" 7.28 8.68 85 K=6.04% A REDUCED AGE 13146 2 100.98 hornblende conventional K-Ar MT-4 "4.72E-04, 0.584E-04, 1.19E-04*" 1.04 1.555 83 K=0.863% PROBABLY A REDUCED AGE 13147 1 90.01 biotite conventional K-Ar BP-5 "4.72E-04, 0.584E-04, 1.19E-04*" 7.88 10.47 80 age of intrusion K=6.54% 13148 1 88.8 biotite conventional K-Ar BP-4 "4.72E-04, 0.584E-04, 1.19E-04*" 9.05 11.86 82 age of intrusion K=7.51% 13149 1 82.87 biotite conventional K-Ar BP-9 "4.72E-04, 0.584E-04, 1.19E-04*" 8.69 10.61 85 minimum age of intrusion K=7.21% 13150 1 87.4 85 biotite conventional K-Ar BP-3 "4.72E-04, 0.584E-04, 1.19E-04*" 7.26 9.36 84 age of intrusion K=6.03% 13151 1 89.25 biotite conventional K-Ar MG-3 "4.72E-04, 0.584E-04, 1.19E-04*" 8.07 10.63 59 K=6.70% A REDUCED AGE 13151 2 99.92 hornblende conventional K-Ar MG-3 "4.72E-04, 0.584E-04, 1.19E-04*" 0.86 1.272 52 K=0.71% PROBABLY A REDUCED AGE 13152 1 80.32 biotite conventional K-Ar BP-1 "4.72E-04, 0.584E-04, 1.19E-04*" 7.89 9.33 71 K=6.55% A REDUCED AGE 13152 2 150.7 hornblende conventional K-Ar BP-1 "4.72E-04, 0.584E-04, 1.19E-04*" 0.51 1.154 69 K=0.42% PROBABLY A REDUCED AGE 13153 1 92.91 biotite conventional K-Ar BP-6 "4.72E-04, 0.584E-04, 1.19E-04*" 7.38 10.13 89 K=6.13% A REDUCED AGE 13153 2 173.39 hornblende conventional K-Ar BP-6 "4.72E-04, 0.584E-04, 1.19E-04*" 0.524 1.373 75 minimum age of intrusion K=0.435% 13154 1 134.2 biotite conventional K-Ar BP-7 "4.72E-04, 0.584E-04, 1.19E-04*" 6.99 14.02 90 K=5.80% A REDUCED AGE 13154 2 187.31 hornblende conventional K-Ar BP-7 "4.72E-04, 0.584E-04, 1.19E-04*" 0.714 2.029 78 age of intrusion 60-100 MESH K=0.593% 13154 3 184.63 hornblende conventional K-Ar BP-7 "4.72E-04, 0.584E-04, 1.19E-04*" 0.681 1.906 84 age of intrusion 150-200 MESH K=0.565% 13155 1 84.14 biotite conventional K-Ar BP-8 "4.72E-04, 0.584E-04, 1.19E-04*" 6.08 7.54 86 K=5.05% A REDUCED AGE 13156 1 126.11 biotite conventional K-Ar I-2107 "4.72E-04, 0.584E-04, 1.19E-04*" 7.7 14.48 93 K=6.39% A REDUCED AGE 13157 1 106.01 biotite conventional K-Ar BP-2 "4.72E-04, 0.584E-04, 1.19E-04*" 7.64 12.01 68 K=6.34% A REDUCED AGE 13157 2 154.41 hornblende conventional K-Ar BP-2 "4.72E-04, 0.584E-04, 1.19E-04*" 0.86 1.996 76 age of intrusion K=0.71% 13158 1 160.59 biotite conventional K-Ar I-305 "4.72E-04, 0.584E-04, 1.19E-04*" 8.35 20.19 96 age of intrusion K=6.93% 13159 1 157.92 biotite conventional K-Ar W-53 "4.72E-04, 0.584E-04, 1.19E-04*" 7.18 17.06 89 age of intrusion K=5.96% 13160 1 76.34 biotite conventional K-Ar W-90 "4.72E-04, 0.584E-04, 1.19E-04*" 9.38 10.53 72 minimum age of intrusion K=7.79% 13161 1 82.81 biotite conventional K-Ar I-2031 "4.72E-04, 0.584E-04, 1.19E-04*" 9.23 11.26 90 age of intrusion K=7.66% 13182 1 77 3 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 8.14 9.219 84 age of intrusion 13183 1 80.2 2.9 biotite conventional K-Ar AK110 "4.962E-04, 0.581E-04, 1.1167E-04" 10.3 69 age of intrusion 13184 1 79.1 2.9 biotite conventional K-Ar AK104 "4.962E-04, 0.581E-04, 1.1167E-04" 10.19 73 age of intrusion 13187 1 76.7 2.8 biotite conventional K-Ar AK114 "4.962E-04, 0.581E-04, 1.1167E-04" 10.53 68 age of intrusion 13190 1 69.2 2 biotite conventional K-Ar 69AH228 "4.962E-04, 0.581E-04, 1.1167E-04" 8.624 90 age of intrusion 13191 1 71.2 2 biotite conventional K-Ar 69AH283 "4.962E-04, 0.581E-04, 1.1167E-04" 9.563 90 age of intrusion 13192 1 78.8 2.9 biotite conventional K-Ar 77AH8 "4.962E-04, 0.581E-04, 1.1167E-04" 7.49 56 age of intrusion 13198 1 18.9 0.7 sanidine conventional K-Ar M502 "4.962E-04, 0.581E-04, 1.1167E-04" 1.799 73 age of volcanism 13199 1 21.1 0.6 sericite conventional K-Ar M600 "4.962E-04, 0.581E-04, 1.1167E-04" 8.24 2.52 82 K20% DETERMINED BY ISOTOPIC DILUTION AGES ARE TOO OLD; MINERALIZATION OCCURRED ABOUT 18-19 M.Y. AGO 13200 1 20.5 0.7 sericite conventional K-Ar M704 "4.962E-04, 0.581E-04, 1.1167E-04" 7.5 2.229 56 K20% DETERMINED BY ISOTOPE DILUTION AGES ARE TOO OLD; MINERALIZATION OCCURRED ABOUT 18-19 M.Y. AGO 13211 1 26.7 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13212 1 35.9 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13213 1 31.5 0.7 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism AVERAGE OF 18 K-FELDSPAR ANALYSES (NO ANALYTICAL DATA GIVEN) 13214 1 36.8 0.7 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13215 1 35.6 0.3 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism AVERAGE OF 4 K-FELDSPAR ANALYSES; NO ANALYTICAL DATA GIVEN 13216 1 36.2 0.4 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism AVERAGE OF 2 K-FELDSPAR ANALYSES; NO ANALYTICAL DATA GIVEN 13217 1 37.1 0.4 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism AVERAGE OF 2 K-FELDSPAR ANALYSES; NO ANALYTICAL DATA GIVEN 13218 1 36.6 0.7 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism "AVERAGE OF 6 K-FELDSPAR ANALYSES, NO ANALYTICAL DATA GIVEN" 13219 1 37.2 0.7 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13220 1 38.4 1.5 plagioclase conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13221 1 42.9 0.9 biotite conventional K-Ar (NOT GIVEN) no decay constants given minimum age of volcanism DETRITAL BIOTITE NO ANALYTICAL DATA GIVEN 13222 1 45.8 1.1 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13223 1 48.6 1.3 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13224 1 36.9 0.7 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13225 1 17.6 whole rock conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN AGE IS APPARENTLY TOO YOUNG 13226 1 22 whole rock conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 13227 1 22.5 0.4 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13228 1 26.2 0.5 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13229 1 26.3 0.5 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13230 1 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism 5 ANALYSES OF K-FELDSPAR AND AMPHIBOLE RANGING IN AGE FROM 34.6-35.6 M.Y. 13231 1 K feldspar conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion 4 ANALYSES OF K-FELDSPAR GAVE AGES RANGING FROM 34.3 TO 36.8 M.Y. 13232 1 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion 4 ANALYSES OF K-FELDSPAR AND BIOTITE GAVE AGES RANGING FROM 26.4 TO 32.8 M.Y. 13233 1 21.1 0.4 Unk conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13234 1 41.5 0.6 biotite conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 13235 1 Unk (NOT GIVEN) no decay constants given age of intrusion "3 ANALYSES OF WHOLE-ROCK OR PLAGIOCLASE GAVE AGES OF 32, 33, 40(?) M.Y." 40 M.Y. AGE IS PROBABLY TOO OLD 13236 1 28.7 1 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13237 1 33.3 0.6 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13238 1 16.3 0.6 whole rock conventional K-Ar (NOT GIVEN) no decay constants given age of volcanism NO ANALYTICAL DATA GIVEN 13239 1 17.59 1.2 whole rock conventional K-Ar LL87 no decay constants given* 4.19 1.066 53 age of volcanism K=3.48% 13240 1 42.82 2.1 whole rock conventional K-Ar WILLOW no decay constants given* 5.24 3.269 80 age of intrusion K=4.35% 13241 1 36.44 2.5 whole rock conventional K-Ar LL49 no decay constants given* 3.51 1.86 53 age of volcanism K=2.91% 13242 1 31.97 2.3 K feldspar conventional K-Ar LL48 no decay constants given* 5.78 2.684 46 age of volcanism K-FELDSPAR WITH SOME QUARTZ K=4.80% 13243 1 35.17 2.7 K feldspar conventional K-Ar MAVERICK no decay constants given* 5.28 2.7 35 age of intrusion K-FELDSPAR WITH SOME QUARTZ K=4.38% 13244 1 29.01 2.4 K feldspar conventional K-Ar LL46A no decay constants given* 6.19 2.606 20 age of volcanism K=5.14% 13244 2 29.58 2.5 whole rock conventional K-Ar LL46B no decay constants given* 2.2 0.9446 19 age of volcanism K=1.83% 13245 1 41.09 2.9 K feldspar conventional K-Ar INDIAN HEAD no decay constants given* 5.02 3.004 47 age of intrusion K=4.17% 13246 1 39.18 2.2 K feldspar conventional K-Ar BEE no decay constants given* 5.52 3.148 77 age of intrusion K=4.58% 13247 1 41.2 2.5 K feldspar conventional K-Ar 4320 no decay constants given* 5.17 3.102 68 age of intrusion K=4.29% 13248 1 26.02 1.9 K feldspar conventional K-Ar GOVERNMENT SPRINGS no decay constants given* 4.99 1.883 48 age of volcanism K-FELDSPAR WITH SOME QUARTZ K=4.14% 13249 1 26.67 1.9 K feldspar conventional K-Ar WILDHORSE no decay constants given* 4.04 1.563 44 age of volcanism K=3.35% 13250 1 27.26 1.9 K feldspar conventional K-Ar BURRO SPRING no decay constants given* 4.55 1.799 52 age of volcanism K=3.78% 13251 1 37.43 2.6 K feldspar conventional K-Ar STUDY BUTTE no decay constants given* 4.98 2.712 53 age of intrusion K=4.13% 13252 1 38.28 2.4 K feldspar conventional K-Ar SAWMILL no decay constants given* 4.24 2.362 64 age of intrusion K=3.52% 13253 1 23.36 1.4 K feldspar conventional K-Ar CHISOS no decay constants given* 5.14 1.74 72 age of volcanism K-FELDSPAR ETCHED WITH HF K=4.27% 13253 2 23.47 1.3 K feldspar conventional K-Ar CHISOS no decay constants given* 5.14 1.748 74 age of volcanism K-FELDSPAR ETCHED WITH HF K=4.27% 13254 1 34.49 2 K feldspar conventional K-Ar BURRO MESA no decay constants given* 3.71 1.86 69 age of volcanism K-FELDSPAR ETCHED WITH HF K=3.08% 13254 2 35.74 2.1 K feldspar conventional K-Ar BURRO MESA no decay constants given* 3.71 1.928 70 age of volcanism K-FELDSPAR ETCHED WITH HF K=3.08% 13255 1 68.07 0.78 whole rock conventional K-Ar E1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.8807 92 "K=2.3985, 2.3950%" AVERAGE OF 3 AGE DETERMINATIONS IS 66.94+/-1.92 M.Y. 13255 2 64.72 0.74 whole rock conventional K-Ar E1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.7363 93 "K=2.3985, 2.3950%" AVERAGE OF 3 AGE DETERMINATIONS IS 66.94+/-1.92 M.Y. 13255 3 68.03 0.76 whole rock conventional K-Ar E1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.8791 86 "K=2.3985, 2.3950%" AVERAGE OF 3 AGE DETERMINATIONS IS 66.94+/-1.92 M.Y. 13256 1 48.25 0.56 whole rock conventional K-Ar E2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.0338 71 age of volcanism "K=1.2203, 1.2219%" 13257 1 46.32 0.55 whole rock conventional K-Ar E3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8245 44 age of volcanism "K=1.0131, 1.0147, 1.0146%" 13258 1 47.3 0.53 whole rock conventional K-Ar E4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9762 81 age of volcanism "K=1.1747, 1.1764%" 13259 1 47.19 0.54 whole rock conventional K-Ar E5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9522 73 age of volcanism "K=1.1495, 1.1492%" 13260 1 46.56 0.53 biotite conventional K-Ar E6 "4.962E-04, 0.581E-04, 1.1167E-04" 5.7543 73 age of volcanism "K=7.0482, 7.0342%" 13261 1 70.02 0.79 muscovite conventional K-Ar TM4 "4.962E-04, 0.581E-04, 1.1167E-04" 11.118 90 "K=8.9724, 9.0020, 9.0116%" TIME OF MINERALIZATION; AVERAGE OF 2 AGE DETERMINATIONS IS 69.16+/-0.78 M.Y. 13261 2 68.3 0.77 muscovite conventional K-Ar TM4 "4.962E-04, 0.581E-04, 1.1167E-04" 10.85 92 "K=8.9724, 9.0020, 9.0116%" TIME OF MINERALIZATION; AVERAGE OF 2 AGE DETERMINATIONS IS 69.16+/-0.78 M.Y. 13262 1 60.48 0.68 whole rock conventional K-Ar TM5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.8738 63 age of intrusion "K=1.7598, 1.7567%" AVERAGE OF 3 AGE DETERMINATIONS IS 60.85+/-2.46 M.Y. 13262 2 58.65 0.79 whole rock conventional K-Ar TM5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.8163 53 age of intrusion "K=1.7598, 1.7567%" AVERAGE OF 3 AGE DETERMINATIONS IS 60.85+/-2.46 M.Y. 13262 3 63.51 0.71 whole rock conventional K-Ar TM5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.9693 62 age of intrusion "K=1.7598, 1.7567%" AVERAGE OF 3 AGE DETERMINATIONS IS 60.85+/-2.46 M.Y. 13263 1 46.37 0.59 whole rock conventional K-Ar TM6 "4.962E-04, 0.581E-04, 1.1167E-04" 3.1433 92 age of intrusion "K=3.8610, 3.8633%" AVERAGE OF 2 AGE DETERMINATIONS IS 45.92+/-0.57 M.Y. 13263 2 45.46 0.55 whole rock conventional K-Ar TM6 "4.962E-04, 0.581E-04, 1.1167E-04" 3.0808 91 age of intrusion "K=3.8610, 3.8633%" AVERAGE OF 2 AGE DETERMINATIONS IS 45.92+/-0.57 M.Y. 13264 1 50.64 0.72 whole rock conventional K-Ar TM15 "4.962E-04, 0.581E-04, 1.1167E-04" 2.119 1.5666 62 age of intrusion K=1.759% 13265 1 432.9 3.3 hornblende 39Ar-40Ar incremental (plateau) 1 "4.905E-04, 0.575E-04, 1.18E-04" 92 age of sedimentation SEE ARTICLE FOR ANALYTICAL DATA FOR 40-39AR 13266 1 427.8 3.5 hornblende 39Ar-40Ar incremental (plateau) 2 "4.905E-04, 0.575E-04, 1.18E-04" 83 age of intrusion SEE ARTICLE FOR ANALYTICAL DATA FOR 40-39AR 13267 1 160 3.5 hornblende conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04" 2.041 73 minimum age of intrusion 13268 1 20 2 hornblende conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04" 0.0946 18 age of intrusion 13269 1 48.2 6 biotite conventional K-Ar 3 "4.72E-04, 0.585E-04, 1.19E-04" 6.118 16 age of intrusion 13270 1 51.1 3 hornblende conventional K-Ar 4 "4.72E-04, 0.585E-04, 1.19E-04" 0.2148 43 minimum age of intrusion 13271 1 48.4 2 muscovite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04" 7.631 64 age of intrusion 13271 2 43.79 2 biotite conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 5.341 41 minimum age of intrusion 13272 1 24.1 3 biotite conventional K-Ar 6 "4.72E-04, 0.585E-04, 1.19E-04" 2.791 16 age of intrusion 13273 1 87.2 3 biotite conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04" 12.02 84 A REDUCED AGE 13273 2 188 6 hornblende conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04" 1.072 69 age of intrusion 13274 1 46.8 1 muscovite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04" 7.338 74 age of intrusion 13274 2 44.6 1 biotite conventional K-Ar 8 "4.72E-04, 0.585E-04, 1.19E-04" 5.978 63 age of intrusion 13275 1 30.6 1 biotite conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04" 4.293 92 minimum age of intrusion 13276 1 20.9 3 muscovite conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04" 2.591 17 age of intrusion 13276 2 18.93 1 hornblende conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04*" 0.423 0.1159 37 age of intrusion 13277 1 61 2 hornblende conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04" 0.6074 63 minimum age of intrusion 13278 1 25.96 1 biotite conventional K-Ar 12 "4.72E-04, 0.585E-04, 1.19E-04*" 8.43 3.174 47 age of intrusion 13279 1 165 5 biotite conventional K-Ar 13 "4.72E-04, 0.585E-04, 1.19E-04" 22.1 92 minimum age of intrusion 13280 1 279 8 hornblende conventional K-Ar 15 "4.72E-04, 0.585E-04, 1.19E-04" 2.812 89 age of intrusion 13281 1 136 4 hornblende conventional K-Ar 16 "4.72E-04, 0.585E-04, 1.19E-04" 0.6358 52 PROBABLY A REDUCED AGE 13282 1 23.5 0.7 muscovite conventional K-Ar 17 "4.72E-04, 0.585E-04, 1.19E-04" 3.092 18 age of intrusion 13283 1 225 6 hornblende conventional K-Ar 18 "4.72E-04, 0.585E-04, 1.19E-04" 1.132 90 age of intrusion 13284 1 284 7 hornblende conventional K-Ar 19 "4.72E-04, 0.585E-04, 1.19E-04" 6.153 95 age of intrusion 13285 1 10.9 0.6 whole rock conventional K-Ar 733C "4.962E-04, 0.581E-04, 1.1167E-04" 0.1662 17 age of volcanism 13286 1 15.4 0.2 sanidine conventional K-Ar 728A "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 1.1925 77 age of volcanism 13287 1 65.4 2.6 muscovite conventional K-Ar 837 "4.962E-04, 0.581E-04, 1.1167E-04" 10.75 10.3001 21 TIME OF MINERALIZATION 13288 1 67.8 2 muscovite conventional K-Ar 278A "4.962E-04, 0.581E-04, 1.1167E-04" 10.95 10.8991 79 TIME OF MINERALIZATION 13289 1 68.8 1.8 muscovite conventional K-Ar 923 "4.962E-04, 0.581E-04, 1.1167E-04" 10.8465 88 TIME OF MINERALIZATION 13290 1 72 2.1 muscovite conventional K-Ar 884 "4.962E-04, 0.581E-04, 1.1167E-04" 10.67 11.2823 77 age of intrusion 13291 1 76.3 3 biotite conventional K-Ar 999 "4.962E-04, 0.581E-04, 1.1167E-04" 9.06 10.1666 85 age of metamorphic crystallization 13292 1 126.9 3.8 sericite conventional K-Ar 79GM8B "4.962E-04, 0.581E-04, 1.1167E-04" 11.64 22.0225 91 AGE APPEARS TO BE TOO OLD; CAUSE IS UNKNOWN 13292 2 130.3 3.9 sericite conventional K-Ar 79GM8B "4.962E-04, 0.581E-04, 1.1167E-04" 11.64 22.655 88 AGE APPEARS TO BE TOO OLD; CAUSE IS UNKNOWN 13293 1 712 5 muscovite conventional K-Ar 735 "4.962E-04, 0.581E-04, 1.1167E-04" 10.62 133.42 98 "A HYBRID AGE, CAUSE IS UNKNOWN" 13294 1 822 6 muscovite conventional K-Ar 735-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.67 160.07 95 "A HYBRID AGE, CAUSE IS UNKNOWN" 13295 1 31.8 0.7 anorthoclase conventional K-Ar CHIN 445 "4.72E-04, 0.584E-04, 1.19E-04" 2.7395 9192 age of volcanism "K=4.786, 4.831%; 40AR-RAD=6.201, 6.079XE-6 CC/GM" 13296 1 31.7 3.1 hornblende conventional K-Ar CHIN 431F "4.72E-04, 0.584E-04, 1.19E-04" 0.6126 1719 age of volcanism "K=1.082, 1.075%; 40AR-RAD=1.281, 1.465XE-6 CC/GM" 13297 1 32.1 0.7 anorthoclase conventional K-Ar CHIN 209 "4.72E-04, 0.584E-04, 1.19E-04" 3.057 9394 age of volcanism "K=5.336, 5.305%; 40AR-RAD=6.927, 6.774XE-6 CC/GM" 13298 1 31.2 0.6 amphiboles conventional K-Ar SL2 "4.72E-04, 0.584E-04, 1.19E-04" 0.5457 6349 age of intrusion "K=0.9726, 0.9781%; 40AR-RAD=1.217, 1.229XE-6 CC/GM" 13299 1 47.1 2.3 biotite conventional K-Ar 2 no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 13300 1 23.72 1 whole rock conventional K-Ar 59 "4.72E-04, 0.584E-04, 1.19E-04*" 1.59 0.5466 1516 minimum age of intrusion "K=1.32%; RAD AR-40=1.21, 1.24XE-6 CC/GM" 13301 1 21.86 1 whole rock conventional K-Ar C20 "4.72E-04, 0.584E-04, 1.19E-04*" 2.05 0.6492 1819 minimum age of intrusion "K=1.70%; RAD AR-40=1.43, 1.48XE-6 CC/GM" 13302 1 23.91 1 whole rock conventional K-Ar C21 "4.72E-04, 0.584E-04, 1.19E-04*" 1.41 0.4886 2019 minimum age of intrusion "K=1.17%; RAD AR-40=1.05, 1.14XE-6 CC/GM" 13303 1 21.77 1 whole rock conventional K-Ar C29 "4.72E-04, 0.584E-04, 1.19E-04*" 1.3 0.41 1619 minimum age of intrusion "K=1.08%; RAD AR-40=0.931, 0.908XE-6 CC/GM" 13304 1 19.7 0.6 whole rock conventional K-Ar 188 "4.72E-04, 0.584E-04, 1.19E-04*" 2.59 0.7385 2128 minimum age of intrusion "MATRIX, NO PHENOCRYSTS" "K=2.15%; RAD AR-40=1.68, 1.63XE-6 CC/GM" 13304 2 19.74 0.5 K feldspar conventional K-Ar 188 "4.72E-04, 0.584E-04, 1.19E-04*" 2.53 0.7228 41 minimum age of intrusion PLAGIOCLASE AND ANORTHOCLASE PHENOCRYSTS K=2.10%; RAD AR-40=1.62XE-6 CC/GM 13304 3 20.75 0.4 biotite conventional K-Ar 188 "4.72E-04, 0.584E-04, 1.19E-04*" 7.84 2.356 68 minimum age of intrusion K=6.51%; RAD AR-40=5.28XE-6 CC/GM 13304 4 20.85 0.5 hornblende conventional K-Ar 188 "4.72E-04, 0.584E-04, 1.19E-04*" 1.33 0.4016 40 minimum age of intrusion K=1.10%; RAD AR-40=0.90XE-6 CC/GM 13305 1 19.43 0.5 whole rock conventional K-Ar W "4.72E-04, 0.584E-04, 1.19E-04*" 2.07 0.5823 2643 minimum age of intrusion MATRIX WITH NO PHENOCRYSTS "K=1.72%; RAD AR-40=1.28, 1.33XE-6 CC/GM" 13305 2 18 0.5 K feldspar conventional K-Ar W "4.72E-04, 0.584E-04, 1.19E-04*" 3.65 0.9526 5761 minimum age of intrusion PLAGIOCLASE AND ANORTHOCLASE "K=3.03%; RAD AR-40=2.19, 2.08XE-6 CC/GM" 13306 1 21.46 0.9 whole rock conventional K-Ar C62 "4.72E-04, 0.584E-04, 1.19E-04*" 2.9 0.9013 28 minimum age of intrusion K=2.41%; RAD AR-40=2.02XE-6 CC/GM 13307 1 18.21 1 whole rock conventional K-Ar C-199 "4.72E-04, 0.584E-04, 1.19E-04*" 3.41 0.8983 272919 minimum age of intrusion "K=2.83%; RAD AR-40=1.86, 2.23, 1.95XE-6 CC/GM" 13322 1 0.08 0 glass conventional K-Ar 1(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 4.85 0.0056 31 minimum age of volcanism SPURIOUS AGE 13323 1 0.18 0 glass conventional K-Ar 2(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 4.98 0.0131 30 minimum age of volcanism 13324 1 6.26 0.06 glass conventional K-Ar 3(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 3.46 0.376 82 minimum age of volcanism 13329 1 5.28 0.22 glass conventional K-Ar 8(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 4.14 0.379 12 age of volcanism 13331 1 5.99 0.06 glass conventional K-Ar 10(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 5 0.427 71 minimum age of volcanism 13333 1 8.48 0.08 glass conventional K-Ar 13(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 3.47 0.512 80 minimum age of intrusion 13336 1 8.06 0.08 glass conventional K-Ar 17(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 3.25 0.456 75 minimum age of intrusion 13341 1 24.3 0.3 glass conventional K-Ar 23(TABLE 3) "4.962E-04, 0.581E-04, 1.1167E-04" 4.23 1.8 97 minimum age of volcanism 13362 1 26.9 0.6 whole rock conventional K-Ar ESP-1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.786 2.645 85 age of volcanism "K=5.633% (MEAN OF 4 ANALYSES), 40AR-RAD VALUE IS MEAN OF 6 ANALYSES" 13363 1 25.1 0.6 whole rock conventional K-Ar ESP-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8766 0.3186 49 age of volcanism "K=0.7288, 0.7274, 0.7268%; 40AR-RAD=31.77, 31.94XE-12 MOL/G" 13364 1 34.3 0.8 whole rock conventional K-Ar ESP-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.137 0.5668 84 age of volcanism "K=0.9435% (MEAN OF 4 ANALYSES), 40AR-RAD. VALUE IS MEAN OF 3 ANALYSES" 13365 1 34.6 0.7 whole rock conventional K-Ar ESP-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.503 0.7567 82 age of volcanism "K=1.248% (MEAN OF 4 ANALYSES), 40AR-RAD. VALUE IS MEAN OF 4 ANALYSES" 13366 1 22.61 0.48 whole rock conventional K-Ar 75-96 "4.905E-04, 0.575E-04, 1.18E-04*" 8.11 2.657 9494 age of volcanism "K=6.73%; 40AR-RAD=268.0, 263.4XE-12 MOL/G" 13367 1 22.44 0.47 whole rock conventional K-Ar 75-27 "4.905E-04, 0.575E-04, 1.18E-04*" 3.42 1.112 8484 age of volcanism "K=2.84%; 40AR-RAD=112.2, 110.1XE-12 MOL/G" 13368 1 22.43 0.47 whole rock conventional K-Ar 75-28 "4.905E-04, 0.575E-04, 1.18E-04*" 3.61 1.173 9394 age of volcanism "K=3.00%, 40AR-RAD=117.4, 117.2XE-12 MOL/G" 13369 1 22.27 0.5 hornblende conventional K-Ar 75-85 "4.905E-04, 0.575E-04, 1.18E-04*" 0.958 0.309 5858 age of volcanism "K=0.795%; 40AR-RAD=31.0, 30.8XE-12 MOL/G" 13370 1 20.73 0.5 whole rock conventional K-Ar 75-29 "4.905E-04, 0.575E-04, 1.18E-04*" 11.54 3.464 53535958 age of volcanism K=9.58%; 40AR-RAD VALUE IS MEAN OF 4 ANALYSES 13371 1 22.04 0.45 biotite conventional K-Ar 73-141 "4.905E-04, 0.575E-04, 1.18E-04*" 8.18 2.612 7574 age of volcanism "K=6.79%; 40AR-RAD=261.9, 260.5XE-12 MOL/G" 13372 1 15.09 0.34 whole rock conventional K-Ar 73-140 "4.905E-04, 0.575E-04, 1.18E-04*" 9.95 2.17 7172 age of volcanism "K=8.26%, 40AR-RAD=217.5, 216.6XE-12 MOL/G" 13373 1 14.69 0.34 whole rock conventional K-Ar 74-87 "4.905E-04, 0.575E-04, 1.18E-04*" 10.55 2.24 6362 age of volcanism "K=8.76%; 40AR-RAD=225.5, 222.5XE-12 MOL/G" 13374 1 35.01 1.4 biotite conventional K-Ar 31-Jan "4.72E-04, 0.585E-04, 1.19E-04*" 7.31 3.72 86 age of volcanism 13374 2 34.15 2.2 hornblende conventional K-Ar 31-Jan "4.72E-04, 0.585E-04, 1.19E-04*" 0.82 0.407 94 age of volcanism 2% CLINOPYROXENE IN HORNBLENDE CONCENTRATE 13375 1 34.87 1.4 biotite conventional K-Ar 1-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 5.82 2.95 88 age of volcanism 13375 2 34.76 1.6 hornblende conventional K-Ar 1-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 1.12 0.566 84 age of volcanism 13376 1 33.14 1.3 biotite conventional K-Ar 2-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 4.03 88 age of intrusion 13377 1 35.25 1.4 biotite conventional K-Ar 3-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 7.65 3.92 79 age of intrusion 13377 2 35.85 2.4 hornblende conventional K-Ar 3-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 0.89 0.464 79 age of intrusion 13378 1 34.24 1.3 biotite conventional K-Ar 4-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 8.42 4.19 90 age of volcanism 13378 2 31.99 1.8 hornblende conventional K-Ar 4-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 1.02 0.474 79 age of volcanism 13379 1 31.92 2.7 plagioclase conventional K-Ar 5-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 0.55 0.255 56 minimum age of volcanism 13380 1 31.4 1.3 biotite conventional K-Ar 6-Feb "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13380 2 32.1 2.4 hornblende conventional K-Ar 6-Feb "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13380 3 32.9 4.3 plagioclase conventional K-Ar 6-Feb "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13381 1 33.2 1.3 biotite conventional K-Ar 7-Feb "4.72E-04, 0.585E-04, 1.19E-04" 3.976 83 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 13381 2 33.7 2.1 plagioclase conventional K-Ar 7-Feb "4.72E-04, 0.585E-04, 1.19E-04" 0.4709 88 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 13382 1 34.2 1.6 plagioclase conventional K-Ar 8-Feb "4.72E-04, 0.585E-04, 1.19E-04" 0.5141 85 age of volcanism "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, USGS" 13383 1 30.31 1.2 biotite conventional K-Ar 28-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 8.34 3.67 85 age of volcanism 13383 2 30.92 2.2 plagioclase conventional K-Ar 28-Feb "4.72E-04, 0.585E-04, 1.19E-04*" 0.96 0.431 69 age of volcanism 13384 1 28.33 1.1 biotite conventional K-Ar 1-Mar "4.72E-04, 0.585E-04, 1.19E-04*" 8.32 3.42 82 age of volcanism 13384 2 27.68 1.2 plagioclase conventional K-Ar 1-Mar "4.72E-04, 0.585E-04, 1.19E-04*" 1.98 0.795 91 age of volcanism 13385 1 29.15 1.4 biotite conventional K-Ar 2-Mar "4.72E-04, 0.585E-04, 1.19E-04*" 6.76 2.86 68 age of volcanism 13386 1 29.3 1.2 biotite conventional K-Ar 9-Mar "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13386 2 27.4 0.8 sanidine conventional K-Ar 9-Mar "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13387 1 29.09 1.2 biotite conventional K-Ar 3-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 7.84 3.31 82 age of volcanism 13387 2 27.57 2.3 plagioclase conventional K-Ar 3-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 0.71 0.284 44 age of volcanism 13387 3 32.58 2.3 hornblende conventional K-Ar 3-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.407 84 "SPURIOUS AGE, TOO OLD" 13387 4 32.42 2.3 hornblende conventional K-Ar 3-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 0.86 0.405 81 "SPURIOUS AGE, TOO OLD" 13388 1 28.66 0.8 biotite conventional K-Ar 67L-109 "4.72E-04, 0.585E-04, 1.19E-04*" 8.27 3.44 85 age of volcanism 13388 2 32.98 1.6 hornblende conventional K-Ar 67L-109 "4.72E-04, 0.585E-04, 1.19E-04*" 0.814 0.39 77 "SPURIOUS AGE, TOO OLD" 13389 1 29.4 1.1 biotite conventional K-Ar 4-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 8.74 3.73 88 age of volcanism 13389 2 26.8 2.2 plagioclase conventional K-Ar 4-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 0.8 0.311 43 age of volcanism 13390 1 26.19 1 biotite conventional K-Ar 5-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 3.35 90 age of volcanism 13391 1 29.75 1.2 biotite conventional K-Ar 8-Apr "4.72E-04, 0.585E-04, 1.19E-04*" 8.59 3.71 78 age of intrusion 13392 1 23.85 1 whole rock conventional K-Ar 1-May "4.72E-04, 0.585E-04, 1.19E-04*" 1.86 0.643 82 age of volcanism 13393 1 4.83 1.4 plagioclase conventional K-Ar 2-May "4.72E-04, 0.585E-04, 1.19E-04*" 0.575 0.04 40 age of volcanism 13394 1 5.49 0.7 plagioclase conventional K-Ar 3-May "4.72E-04, 0.585E-04, 1.19E-04*" 1.15 0.091 56 age of intrusion 13395 1 18.08 1.4 whole rock conventional K-Ar 4-May "4.72E-04, 0.585E-04, 1.19E-04*" 1.43 0.374 26 age of volcanism 13396 1 22.44 0.9 glass conventional K-Ar 6-May "4.72E-04, 0.585E-04, 1.19E-04*" 4.83 1.57 82 age of volcanism "NONHYDRATED OBSIDIAN ""APACHE TEARS""" "FISSION-TRACK AGE IS 21.2 M.Y. ON GLASS--G.A. IZETT, USGS" 13397 1 68.4 1.7 biotite conventional K-Ar 71-34 "4.962E-04, 0.581E-04, 1.1167E-04" 6.83 6.842 46 age of intrusion K=5.67% 13398 1 62.9 1.2 biotite conventional K-Ar 71-14 "4.962E-04, 0.581E-04, 1.1167E-04" 5.78 5.325 62 VERMICULITIZED BIOTITE K=4.80% "SPURIOUS AGE, TOO YOUNG" 13399 1 65.6 1.4 biotite conventional K-Ar 75-55 "4.962E-04, 0.581E-04, 1.1167E-04" 7.85 7.554 8687 "K=6.52%; 40AR-RAD=747.0, 763.8XE-12 MOL/G" A RESET AGE DUE TO THERMAL PULSE FROM WICKENBURG BATHOLITH 13400 1 26 0.6 biotite conventional K-Ar 75-54 "4.962E-04, 0.581E-04, 1.1167E-04" 7.96 3.0045 8989 age of volcanism "K=6.61%; 40AR-RAD=298.4, 302.5XE-12 MOL/G" 13401 1 18.2 0.4 biotite conventional K-Ar 72-44 "4.962E-04, 0.581E-04, 1.1167E-04" 7.28 1.914 56 age of intrusion K=6.04% 13402 1 17.1 0.4 whole rock conventional K-Ar 75-53 "4.962E-04, 0.581E-04, 1.1167E-04" 6.96 1.719 "K=5.78%; 40AR-RAD=170.3, 170.4, 172.1, 173.4, 173.3XE-12 MOL/G" POSSIBLE TIME OF FAULTING 13403 1 16.7 1.1 whole rock conventional K-Ar 72-60 "4.962E-04, 0.581E-04, 1.1167E-04" 2.46 0.5925 1115 age of volcanism "K=2.04%; 40AR-RAD=57.8, 60.7XE-12 MOL/G" 13404 1 16.3 0.3 whole rock conventional K-Ar 72-13 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 2.168 51 minimum age of volcanism K=7.64% 13405 1 16.2 0.5 whole rock conventional K-Ar 71-35A "4.962E-04, 0.581E-04, 1.1167E-04" 10.42 2.443 323031 age of intrusion "K=8.65%; 40AR-RAD=241.1, 243.8, 248.0XE-12 MOL/G" 13406 1 16.1 0.4 whole rock conventional K-Ar 71-35B "4.962E-04, 0.581E-04, 1.1167E-04" 9.77 2.2785 7470 age of intrusion ACID LEACHED "K=8.11%; 40AR-RAD=226.5, 229.2XE-12 MOL/G" 13407 1 16.1 0.4 whole rock conventional K-Ar 76-16 "4.962E-04, 0.581E-04, 1.1167E-04" 9.7 2.256 616060 minimum age of volcanism "K=8.05%; 40AR-RAD=223.5, 227.4, 225.8XE-12 MOL/G" 13408 1 13.5 0.3 whole rock conventional K-Ar 72-43 "4.962E-04, 0.581E-04, 1.1167E-04" 1.036 0.2021 3941 age of volcanism "K=0.860%, 40AR-RAD=19.54, 20.87XE-12 MOL/G" 13409 1 64.35 2.6 clay minerals conventional K-Ar MB314 "4.72E-04, 0.585E-04, 1.19E-04*" 3.292 3.105 4550 CLAY-SIZE FRACTION MAY BE THE APPROXIMATE TIME OF DIAGENESIS 13410 1 49.46 2 clay minerals conventional K-Ar MB642 "4.72E-04, 0.585E-04, 1.19E-04*" 3.597 2.597 4040 CLAY-SIZE FRACTION MAY BE THE APPROXIMATE TIME OF DIAGENESIS 13411 1 62.2 2.3 clay minerals conventional K-Ar MB886 "4.72E-04, 0.585E-04, 1.19E-04*" 5.443 4.959 4952 CLAY-SIZE FRACTION MAY BE THE APPROXIMATE TIME OF DIAGENESIS 13412 1 55.95 2.1 clay minerals conventional K-Ar MB912 "4.72E-04, 0.585E-04, 1.19E-04*" 5.333 4.363 6172 CLAY-SIZE FRACTION MAY BE THE APPROXIMATE TIME OF DIAGENESIS 13413 1 101.04 4 illite conventional K-Ar MS921 "4.72E-04, 0.585E-04, 1.19E-04*" 2.624 3.926 4871 age of sedimentation ILLITE+SMECTITE (50% ILLITE) "ANALYTICAL DATA FROM NADEAU, 1980 (PH.D. DISSERTATION)" 13414 1 218.85 8 illite conventional K-Ar MS86 "4.72E-04, 0.585E-04, 1.19E-04*" 3.242 10.86 7882 CLAY-SIZE FRACTION "ANALYTICAL DATA FROM NADEAU, 1980 (PH.D. DISSERTATION)" THE AGE OF DETRITAL ILLITE IN THE CRETACEOUS SKALE (MANCOS SHALE) 13415 1 41.28 1.7 clay minerals conventional K-Ar MB452 "4.72E-04, 0.585E-04, 1.19E-04*" 3.766 2.264 2120 CLAY-SIZE FRACTION MAY BE THE APPROXIMATE TIME OF DIAGENESIS 13493 1 27.62 1.1 biotite conventional K-Ar NS-11 "4.905E-04, 0.575E-04, 1.18E-04*" 6.956 2.787 4550 "K=5.817, 5.731%" A REDUCED AGE 13494 1 18.8 1.5 hornblende conventional K-Ar NS-6-95 "4.905E-04, 0.575E-04, 1.18E-04*" 0.64 0.1741 16 "K=0.526, 0.536%" A REDUCED AGE 13495 1 17.9 0.7 K feldspar conventional K-Ar NS-8-262 "4.905E-04, 0.575E-04, 1.18E-04*" 11.98 3.102 5039 "K=9.911, 9.888, 10.041%" A REDUCED AGE 13496 1 65.1 2 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 8.59 85 "A RESET AGE. SEE CALZIA AND MORTON, 1980" 13498 1 11 0.3 whole rock conventional K-Ar 1 AP76-186A "4.962E-04, 0.581E-04, 1.1167E-04" 1.49 0.2369 68 age of volcanism 13499 1 12.8 0.3 whole rock conventional K-Ar 2 AP76-37 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2085 52 age of volcanism 13500 1 12.1 0.3 whole rock conventional K-Ar 3 AP76-38 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3628 59 age of intrusion 13501 1 12.9 0.3 whole rock conventional K-Ar 4 AP76-40 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4513 39 age of volcanism 13502 1 17.6 0.6 whole rock conventional K-Ar 5 AP76-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9546 17 minimum age of volcanism 13503 1 19.2 0.7 whole rock conventional K-Ar 6 AP76-35 "4.962E-04, 0.581E-04, 1.1167E-04" 0.633 20 minimum age of volcanism 13504 1 20.3 0.7 whole rock conventional K-Ar 7 AP78-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.216 21 minimum age of volcanism ALTERATION MAY HAVE LOWERED THE AGE 13505 1 13.6 0.5 whole rock conventional K-Ar 8 AP78-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.609 15 minimum age of volcanism ALTERATION MAY HAVE LOWERED THE AGE 13506 1 13 2.1 whole rock conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13507 1 21 3.6 whole rock conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 13508 1 17.9 0.5 biotite conventional K-Ar 13 JSG-74-373 "4.962E-04, 0.581E-04, 1.1167E-04" 6.35 1.688 45 age of volcanism K=5.27% 13509 1 41.5 1.2 biotite conventional K-Ar 14 JSG-74-191 "4.962E-04, 0.581E-04, 1.1167E-04" 4.87 3.016 43 age of volcanism K=4.04% 13510 1 43.3 3.3 Unk conventional K-Ar 15 JSG-74-38-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.337 0.2199 21 K=0.280% AGE APPEARS TO BE TOO OLD. BASALT IS PROBABLY AROUND 20 M.Y. OLD 13511 1 168.4 11.8 hornblende conventional K-Ar MH-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 24 minimum age of intrusion "K=0.855%, 40AR/40K=0.01025" 13511 2 95.2 2.9 biotite conventional K-Ar MH-4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.421 51 "K=7.82%, 40AR/40K=0.00568" A RESET AGE 13512 1 57.9 4.3 hornblende conventional K-Ar MH-7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.825 22 "K=1.515%, 40AR/40K=0.00342" A RESET AGE 13513 1 87.6 3.1 hornblende conventional K-Ar MH-172 "4.962E-04, 0.581E-04, 1.1167E-04" 1.596 38 "K=1.325%, 40AR/40K=0.00521" A RESET AGE 13513 2 53.9 1.6 biotite conventional K-Ar MH-172 "4.962E-04, 0.581E-04, 1.1167E-04" 7.156 42 "K=5.940%, 40AR/40K=0.00318" A RESET AGE 13514 1 107.2 8 hornblende conventional K-Ar MH-100 "4.962E-04, 0.581E-04, 1.1167E-04" 0.801 28 minimum age of intrusion "K=0.665%, 40AR/40K=0.00642" 13515 1 104.5 3.7 hornblende conventional K-Ar MH-9 "4.962E-04, 0.581E-04, 1.1167E-04" 3.614 70 minimum age of intrusion MIXTURE OF 65% HORNBLENDE AND 35% BIOTITE "K=3.000%, 40AR/40K=0.00625" 13515 2 88.7 2.7 biotite conventional K-Ar MH-9 "4.962E-04, 0.581E-04, 1.1167E-04" 8.174 50 "K=6.785%, 40AR/40K=0.00528" A RESET AGE 13516 1 83.5 5.8 biotite conventional K-Ar MH-27 "4.962E-04, 0.581E-04, 1.1167E-04" 7.665 42 "K=6.363%, 40AR/40K=0.00496" A RESET AGE 13517 1 73.4 4.4 biotite conventional K-Ar MH-75 "4.962E-04, 0.581E-04, 1.1167E-04" 3.018 29 "BIOTITE, PARTLY ALTERED TO CHLORITE" "K=2.505%, 40AR/40K=0.00435" MAY REPRESENT THE APPROXIMATE TIME OF THRUST-FAULTING 13518 1 79.9 2.4 biotite conventional K-Ar 1-6D "4.962E-04, 0.581E-04, 1.1167E-04" 8.927 39 minimum age of intrusion "K=7.410%, 40AR/40K=0.00475" 13519 1 136.9 1.3 biotite conventional K-Ar IP "4.72E-04, 0.585E-04, 1.19E-04" 7.7 9080 minimum age of intrusion K=6.39% 13520 1 92.1 0.5 hornblende conventional K-Ar TP "4.72E-04, 0.585E-04, 1.19E-04" 1.69 7573 age of intrusion K=1.40% 13520 2 92.9 1.3 whole rock conventional K-Ar TP "4.72E-04, 0.585E-04, 1.19E-04" 5.52 8678 age of intrusion K=4.58% 13521 1 56.79 1.19 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 3.412 2.833 919092 "K=2.834, 2.830%; 40AR-RAD=285.9, 282.2, 281.8XE-12 MOL/G" "AGE OF ANDESITE BOULDER, NOT AGE OF GRAVEL" 13522 1 54.56 1.17 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 5.796 4.621 8988 "K=4.881, 4.807, 4.804, 4.752%; 40AR-RAD=464.2, 460.0XE-12 MOL/GM" "AGE OF LATITE BOULDER, NOT AGE OF GRAVEL" 13523 1 66.72 1.44 whole rock conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 2.142 2.096 8786 "K=1.781, 1.775%; 40AR-RAD=212.5, 206.7XE-12 MOL/G" "AGE OF ANDESITE BOULDER, NOT AGE OF GRAVEL" 13524 1 28.03 0.6 whole rock conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 6.71 2.728 9896 age of volcanism "K=5.583, 5.558%; 40AR-RAD=272.1, 273.5XE-12 MOL/G" 13525 1 21.9 1.92 whole rock conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.3268 age of volcanism "K=0.856, 0.855%; 40AR-RAD=34.40, 34.06, 28.55, 33.74, 32.63, 32.67XE-12 MOL/G" 13526 1 20.62 1.07 whole rock conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.647 0.1933 2222 age of volcanism "K=0.535, 0.539%; 40AR-RAD=19.36, 19.31XE-12 MOL/G" 13527 1 1.9 0.06 whole rock conventional K-Ar A. "4.962E-04, 0.581E-04, 1.1167E-04" 0.596 0.0163 4543 age of volcanism "K=0.494, 0.495%; 40AR-RAD=1.68, 1.59XE-12 MOL/G" "MCKEE AND MCKEE, 1972, REPORTED A K-AR AGE OF 11.8 M.Y. (RECALCULATED TO 12.1 M.Y.) FOR THIS BASALT--PROBABLY A SPURIOUS AGE" 13527 2 1.76 0.15 whole rock conventional K-Ar B. "4.962E-04, 0.581E-04, 1.1167E-04" 0.571 0.0146 1415 age of volcanism "K=0.473, 0.476%; 40AR-RAD=1.45, 1.46XE-12 MOL/G" "MCKEE AND MCKEE, 1972, REPORTED A K-AR AGE OF 11.8 M.Y. (RECALCULATED TO 12.1 M.Y) FOR THIS BASALT--PROBABLY A SPURIOUS AGE" 13528 1 11.4 0.27 whole rock conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.825 0.1359 5959 age of volcanism "K=0.683, 0.687%; 40AR-RAD=13.65, 13.52XE-12 MOL/G" 13529 1 12.1 0.4 whole rock conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.513 0.0899 3635 age of volcanism "K=0.421, 0.422, 0.428, 0.432%; 40AR-RAD=9.17, 8.81XE-12 MOL/G" 13530 1 10.01 0.23 whole rock conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 2.796 0.4039 76 age of volcanism "K=2.333, 2.310%" 13531 1 9.18 0.28 whole rock conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.778 0.1031 3737 age of volcanism "K=0.644, 0.648%; 40AR-RAD=10.31, 10.30XE-12 MOL/G" 13532 1 9.3 0.21 whole rock conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.564 0.2099 6868 age of volcanism "K=1.303, 1.292%; 40AR-RAD=21.18, 20.81XE-12 MOL/G" 13533 1 10.16 0.22 whole rock conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 1.63 0.2385 7575 age of volcanism "K=1.34, 1.35, 1.35, 1.36%; 40AR-RAD=23.87, 23.83XE-12 MOL/G" 13534 1 10.57 0.31 whole rock conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.27 0.1936 3833 age of volcanism "K=1.056, 1.052%; 40AR-RAD=19.36, 19.37XE-12 MOL/G" 13535 1 9.66 0.35 whole rock conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 1.144 0.1597 2725 age of intrusion "K=0.946, 0.955%; 40AR-RAD=16.09, 15.85XE-12 MOL/G" 13536 1 14.6 0.4 whole rock conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.629 0.1335 3941 age of volcanism "K=0.523, 0.522%; 40AR-RAD=13.1, 13.6XE-12 MOL/G" 13537 1 6.55 0.23 whole rock conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.0637 2627 age of volcanism "K=0.544, 0.557%; 40AR-RAD=6.31, 6.44, 6.36XE-12 MOL/G" 13538 1 8.1 0.3 whole rock conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.553 0.065 21 age of volcanism K=0.459% 13539 1 10.3 0.4 whole rock conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.983 0.146 28 "K=0.811, 0.822%" "AGE OF BASALT COBBLE, NOT THE GRAVEL BED" 13540 1 6.4 0.25 whole rock conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 0.595 0.0548 2726 age of volcanism "K=0.494, 0.493%; 40AR-RAD=5.52, 5.44XE-12 MOL/G" 13541 1 15.4 0.4 whole rock conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.752 0.1672 5756 age of volcanism "K=0.623, 0.626%; 40AR-RAD=16.77, 16.68XE-12 MOL/G" 13542 1 13.75 0.33 whole rock conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.669 0.1328 5353 age of volcanism "K=0.555%; 40AR-RAD=13.32, 13.24XE-12 MOL/G" 13543 1 12.1 1.3 whole rock conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.534 0.0936 18 age of volcanism "K=0.446, 0.441%" 13544 1 28.6 0.8 sanidine conventional K-Ar S292 "4.72E-04, 0.584E-04, 1.19E-04*" 9.54 3.96 63 age of volcanism 13545 1 28.43 0.8 sanidine conventional K-Ar S318 "4.72E-04, 0.584E-04, 1.19E-04*" 10.06 4.15 81 age of volcanism 13546 1 28.54 0.8 sanidine conventional K-Ar DS28 "4.72E-04, 0.584E-04, 1.19E-04*" 11.3 4.68 95 age of volcanism 13546 2 28.36 0.8 biotite conventional K-Ar DS28 "4.72E-04, 0.584E-04, 1.19E-04*" 8.31 3.42 73 age of volcanism 13546 3 27.19 1.9 hornblende conventional K-Ar DS28 "4.72E-04, 0.584E-04, 1.19E-04*" 0.89 0.351 68 minimum age of volcanism 13546 4 28.07 1.9 plagioclase conventional K-Ar DS28 "4.72E-04, 0.584E-04, 1.19E-04*" 0.82 0.334 86 age of volcanism 13547 1 27.49 2.7 biotite conventional K-Ar BC5793 "4.72E-04, 0.584E-04, 1.19E-04*" 8.4 3.35 72 age of volcanism 13548 1 27.48 1.4 sanidine conventional K-Ar S333 "4.72E-04, 0.584E-04, 1.19E-04*" 6.22 2.48 20 age of volcanism 13549 1 27.19 1 sanidine conventional K-Ar S332 "4.72E-04, 0.584E-04, 1.19E-04*" 9.38 3.7 49 age of volcanism 13550 1 27.97 0.8 sanidine conventional K-Ar DS10 "4.72E-04, 0.584E-04, 1.19E-04*" 8.6 3.49 95 maximum age of volcanism 13550 2 26.92 0.8 biotite conventional K-Ar DS10 "4.72E-04, 0.584E-04, 1.19E-04*" 5.66 2.21 80 age of volcanism 13550 3 26.47 1.8 hornblende conventional K-Ar DS10 "4.72E-04, 0.584E-04, 1.19E-04*" 0.87 0.334 68 age of volcanism 13550 4 26.5 1.8 plagioclase conventional K-Ar DS10 "4.72E-04, 0.584E-04, 1.19E-04*" 0.895 0.344 88 age of volcanism 13550 5 25.27 0.7 glass conventional K-Ar DS10 "4.72E-04, 0.584E-04, 1.19E-04*" 5.54 2.03 90 GLASS IS PROBABLY 26.4 M.Y. OLD 13551 1 19.73 0.8 sanidine conventional K-Ar DS29C "4.72E-04, 0.584E-04, 1.19E-04*" 9.7 2.77 93 minimum age of volcanism 13551 2 20.83 0.8 biotite conventional K-Ar DS29C "4.72E-04, 0.584E-04, 1.19E-04*" 8.29 2.5 62 age of volcanism 13551 3 20.8 0.8 hornblende conventional K-Ar DS29C "4.72E-04, 0.584E-04, 1.19E-04*" 0.81 0.244 74 age of volcanism 13551 4 21.45 0.8 plagioclase conventional K-Ar DS29C "4.72E-04, 0.584E-04, 1.19E-04*" 0.94 0.292 75 age of volcanism 13552 1 22.16 0.6 sanidine conventional K-Ar S342B "4.72E-04, 0.584E-04, 1.19E-04*" 7.26 2.33 95 age of volcanism 13552 2 22.52 0.6 sanidine conventional K-Ar S342B "4.72E-04, 0.584E-04, 1.19E-04*" 7.54 2.46 94 age of volcanism 13553 1 12.61 1.3 plagioclase conventional K-Ar S342A "4.72E-04, 0.584E-04, 1.19E-04*" 0.45 0.082 60 MAY BE A PRIMARY AGE 13553 2 16.01 0.9 plagioclase conventional K-Ar S342A "4.72E-04, 0.584E-04, 1.19E-04*" 0.34 0.0787 58 MAY BE A PRIMARY AGE 13560 1 1560 50 muscovite conventional K-Ar 2. UAKA-60-06 "4.962E-04, 0.581E-04, 1.1167E-04" 10.32 368.8 98 minimum age of intrusion K=8.57% 13561 1 1450 50 muscovite conventional K-Ar 2. UAKA-60-06 "4.962E-04, 0.581E-04, 1.1167E-04" 10.48 335.6 98 minimum age of intrusion K=8.70% 13562 1 1170 40 biotite conventional K-Ar 2. UAKA-60-06 "4.962E-04, 0.581E-04, 1.1167E-04" 8.41 198.2 96 minimum age of metamorphic crystallization K=6.98% 13563 1 1500 50 muscovite conventional K-Ar 3. UAKA-60-04 "4.962E-04, 0.581E-04, 1.1167E-04" 10.77 362.1 96 minimum age of intrusion K=8.94% 13564 1 1460 50 muscovite conventional K-Ar 5. UAKA-59-25 "4.962E-04, 0.581E-04, 1.1167E-04" 10.41 338.4 99 age of intrusion K=8.64% 13564 2 1340 50 biotite conventional K-Ar 5. UAKA-59-25 "4.962E-04, 0.581E-04, 1.1167E-04" 8.38 240 98 minimum age of intrusion K=6.96% 13565 1 1400 40 muscovite conventional K-Ar 6. UAKA-59-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.46 255.6 99 minimum age of metamorphic crystallization "K=7.05, 6.98%" 13566 1 1620 40 muscovite conventional K-Ar 6. UAKA-59-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.32 386.8 99 age of intrusion 13567 1 1390 40 biotite conventional K-Ar 7. UAKA-57-17 "4.962E-04, 0.581E-04, 1.1167E-04" 8.72 262.5 99 minimum age of intrusion K=7.24% 13568 1 1180 30 biotite conventional K-Ar 7. UAKA-57-18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.37 200.4 99 K=6.95% AGE APPEARS TOO YOUNG 13569 1 1180 40 biotite conventional K-Ar 7. UAKA-57-19 "4.962E-04, 0.581E-04, 1.1167E-04" 8.59 205.8 98 K=7.13% AGE APPEARS TO BE TOO YOUNG 13570 1 1050 30 biotite conventional K-Ar 7. UAKA-57-20 "4.962E-04, 0.581E-04, 1.1167E-04" 7.59 154.8 97 K=6.30% AGE APPEARS TO BE TOO YOUNG 13571 1 1390 40 biotite conventional K-Ar 8. UAKA-57-15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 261.5 95 minimum age of intrusion K=7.22% 13572 1 1375 30 muscovite conventional K-Ar 9. UAKA-59-14 "4.962E-04, 0.581E-04, 1.1167E-04" 8.84 262.3 100 minimum age of intrusion "K=7.33, 7.34%" 13573 1 1320 40 biotite conventional K-Ar 10. UAKA-21-57 "4.962E-04, 0.581E-04, 1.1167E-04" 9.023 252.1 99 minimum age of intrusion "K=7.485, 7.495%" 13574 1 1250 28 biotite conventional K-Ar 11. UAKA-60-07 "4.962E-04, 0.581E-04, 1.1167E-04" 9.463 245.9 99 minimum age of intrusion K=7.855% 13575 1 1150 30 biotite conventional K-Ar 12. UAKA-63-31 "4.962E-04, 0.581E-04, 1.1167E-04" 7.72 178 99 minimum age of intrusion K=6.41% 13576 1 1110 40 biotite conventional K-Ar 13. UAKA-57-06 "4.962E-04, 0.581E-04, 1.1167E-04" 7.4 162.8 87 minimum age of intrusion K=6.14% 13577 1 1080 30 biotite conventional K-Ar 14. UAKA-65-03 "4.962E-04, 0.581E-04, 1.1167E-04" 8.35 177 100 age of intrusion K=6.93% 13578 1 895 20 muscovite conventional K-Ar 15. UAKA-74-20 "4.962E-04, 0.581E-04, 1.1167E-04" 10.5 175 9898 "K=8.76, 8.68%; 40AR-RAD=17610, 17400XE-12 MOL/G" K-AR AGE HAS BEEN RESET 13579 1 875 30 biotite conventional K-Ar 16. PN-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 134.1 100 K=7.15% K-AR AGE HAS BEEN RESET 13580 1 766 25 biotite conventional K-Ar 17. UAKA-57-4 "4.962E-04, 0.581E-04, 1.1167E-04" 6.65 91.4 80 K=5.52% AGE HAS BEEN LOWERED BY THERMAL EFFECTS FROM NEARBY DIKE 13581 1 649 60 chlorite group conventional K-Ar 18. UAKA-57-22 "4.962E-04, 0.581E-04, 1.1167E-04" 1.46 16.3 100 K=1.21% THIS IS NOT THE AGE OF THE GRANITE 13582 1 577 17 biotite conventional K-Ar 19. UAKA-64-19 "4.962E-04, 0.581E-04, 1.1167E-04" 9.07 88.8 93 K=7.53% AGE IS TOO YOUNG 13583 1 325 6 chlorite group conventional K-Ar 20. UAKA-60-12 "4.962E-04, 0.581E-04, 1.1167E-04" 2.29 11.7 99 "K=1.92, 1.87%" THIS IS PROBABLY NOT A PRIMARY AGE 13584 1 167 4 whole rock conventional K-Ar 21. UAKA-72-57 "4.962E-04, 0.581E-04, 1.1167E-04" 4.46 11.22 94 "K=3.71, 3.68%" "AGE IS TOO YOUNG; EBERLY AND STANLEY, 1978, REPORTED A RB-SR AGE OF 1080 M.Y. FOR THIS GRANITE" 13585 1 155 5 plagioclase conventional K-Ar 22. UAKA-67-200 "4.962E-04, 0.581E-04, 1.1167E-04" 1.95 4.5 87 age of intrusion K=1.62% 13586 1 154 4 biotite conventional K-Ar 23 UAKA-73-65 "4.962E-04, 0.581E-04, 1.1167E-04" 6.11 14.12 949392 age of intrusion "K=5.06, 5.08%; 40AR-RAD=1410, 1416, 1411XE-12 MOL/G" 13587 1 141 3 biotite conventional K-Ar 24. UAKA-63-32 "4.962E-04, 0.581E-04, 1.1167E-04" 9.47 20 96 "K=7.85, 7.88%" "SPURIOUS AGE, TOO YOUNG" 13588 1 140 4 biotite conventional K-Ar 25. UAKA-73-20 "4.962E-04, 0.581E-04, 1.1167E-04" 8.1 17.02 92 "K=6.72%, 40AR-RAD=1700, 1700, 1705XE-12 MOL/G" AGE IS PROBABLY TOO YOUNG 13589 1 129 3 paragonite conventional K-Ar 26. UAKA-77-69 "4.962E-04, 0.581E-04, 1.1167E-04" 0.76 1.46 92 K=0.631% A PARTIALLY RESET AGE 13590 1 111 3 biotite conventional K-Ar 27. UAKA-72-25 "4.962E-04, 0.581E-04, 1.1167E-04" 6.93 11.43 94 age of intrusion "K=5.75, 5.78, 5.71%" 13591 1 100 2 hornblende conventional K-Ar 28. UAKA-73-49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.801 1.19 8988 age of intrusion "K=0.668, 0.662%; 40AR-RAD=120, 118XE-12 MOL/G" 13592 1 94.7 2 biotite conventional K-Ar 29. UAKA-76-114 "4.962E-04, 0.581E-04, 1.1167E-04" 7.97 11.15 919090 minimum age of intrusion "K=6.661, 6.596, 6.591%; 40AR-RAD=1118, 1114, 1113XE-12 MOL/G" 13593 1 74.1 2 whole rock conventional K-Ar 30. UAKA-74-24 "4.962E-04, 0.581E-04, 1.1167E-04" 1.79 1.953 96 minimum age of intrusion K=1.49% 13594 1 73.7 1.8 hornblende conventional K-Ar 31. UAKA-74-42 "4.962E-04, 0.581E-04, 1.1167E-04" 0.72 0.7789 8079 age of volcanism "K=0.598, 0.597%; 40AR-RAD=78.62, 77.15XE-12 MOL/G" 13595 1 70.5 1.7 biotite conventional K-Ar 32. UAKA-75-49 "4.962E-04, 0.581E-04, 1.1167E-04" 7.467 7.72 8989 age of intrusion "K=6.203, 6.192%; 40AR-RAD=773, 771XE-12 MOL/G" 13596 1 70.3 2.9 hornblende conventional K-Ar 33. SJR-HV78-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.46 1.504 6755 age of metamorphic crystallization "K=1.21%, 40AR-RAD=152.3, 148.5XE-12 MOL/G" 13597 1 70.3 1.7 biotite conventional K-Ar 34. UAKA-70-06 "4.962E-04, 0.581E-04, 1.1167E-04" 8.71 8.992 81 age of intrusion K=7.23% 13598 1 68.6 1.4 hornblende conventional K-Ar 35. UAKA-77-50 "4.962E-04, 0.581E-04, 1.1167E-04" 0.823 0.828 age of volcanism "K=0.689, 0.682, 0.677%; 40AR-RAD=82.97, 82.60, 82.84, 82.81XE-12 MOL/G" 13599 1 67.1 1.4 whole rock conventional K-Ar 36. UAKA-77-64 "4.962E-04, 0.581E-04, 1.1167E-04" 1.773 1.741 "K=1.475, 1.468%; 40AR-RAD=173.2, 174.3, 174.7XE-12 MOL/G" EITHER A COOLING AGE OR RESET AGE 13600 1 66.9 1.5 sericite conventional K-Ar 37. UAKA-73-158 "4.962E-04, 0.581E-04, 1.1167E-04" 7.208 7.067 9695 "K=5.967, 5.998%; 40AR-RAD=706.0, 707.4XE-12 MOL/G" AGE OF MINERALIZATION 13601 1 66.5 3.6 biotite conventional K-Ar 38. UAKA-66-03 "4.962E-04, 0.581E-04, 1.1167E-04" 7.51 7.318 22 age of intrusion K=6.23% 13602 1 66 2.2 biotite conventional K-Ar 39. L.HA-1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.25 6.0495 5941 "K=5.19%, 40AR-RAD=613.1, 596.8XE-12 MOL/G" A COOLING AGE OR RESET AGE 13603 1 65.8 1.6 biotite conventional K-Ar 40. UAKA-71-17 "4.962E-04, 0.581E-04, 1.1167E-04" 5.866 5.654 85 age of intrusion CHLORITIZED BIOTITE "K=4.881, 4.856%" 13604 1 64.6 1.5 muscovite conventional K-Ar 41. HVR-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.85 9.329 4623 age of later metamorphism "K=8.18%; 40AR-RAD=927.4, 938.4XE-12 MOL/G" 13605 1 62.8 1.3 whole rock conventional K-Ar 42. UAKA-71-18 "4.962E-04, 0.581E-04, 1.1167E-04" 2.155 1.981 minimum age of volcanism "K=1.786, 1.791%; 40AR-RAD=204.1, 200.8, 191.1, 196.5XE-12 MOL/G" 13606 1 62.5 1.3 biotite conventional K-Ar 43. UAKA-77-29 "4.962E-04, 0.581E-04, 1.1167E-04" 9.072 8.31 minimum age of intrusion "K=7.493, 7.573, 7.528%; 40AR-RAD=832.1, 825.2, 835.7XE-12 MOL/G" 13607 1 58.6 1.4 whole rock conventional K-Ar 44. UAKA-73-86 "4.962E-04, 0.581E-04, 1.1167E-04" 4.907 4.21 8585 minimum age of volcanism "K=4.056, 4.090%; 40AR-RAD=412.2, 429.8XE-12 MOL/G" 13608 1 57.6 1.2 hornblende conventional K-Ar 45. UAKA-75-61 "4.962E-04, 0.581E-04, 1.1167E-04" 1.478 1.245 86 age of later metamorphism "K=1.222, 1.231%" 13609 1 52.2 1.2 biotite conventional K-Ar 45. UAKA-75-61 "4.962E-04, 0.581E-04, 1.1167E-04" 7.069 5.364 59 age of later metamorphism "K=5.877, 5.859%" 13610 1 55.8 1.4 biotite conventional K-Ar 46. UAKA-69-10 "4.962E-04, 0.581E-04, 1.1167E-04" 9.32 7.6 82 age of intrusion K=7.74% 13611 1 55 1.2 biotite conventional K-Ar 47. UAKA-77-63 "4.962E-04, 0.581E-04, 1.1167E-04" 8.616 6.928 age of later metamorphism "K=7.139, 7.165%, 40AR-RAD=709.8, 697.8, 682.0, 681.4XE-12 MOL/G" 13612 1 52.8 1.1 biotite conventional K-Ar 50. UAKA-73-125 "4.962E-04, 0.581E-04, 1.1167E-04" 6.315 4.8725 7575 minimum age of intrusion BIOTITE SOMEWHAT CHLORITIZED "K=5.226, 5.258%; 40AR-RAD=481.6, 492.9XE-12 MOL/G" 13613 1 52.5 1.3 biotite conventional K-Ar 51. UAKA-75-99 "4.962E-04, 0.581E-04, 1.1167E-04" 9.086 6.9715 8989 age of intrusion "K=7.501, 7.582%; 40AR-RAD=694.2, 700.1XE-12 MOL/G" 13614 1 51 1.1 biotite conventional K-Ar 52. UAKA-77-65 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 6.4985 8786 age of later metamorphism "K=7.237, 7.252, 7.252%; 40AR-RAD=654.6, 645.1XE-12 MOL/G" 13615 1 50.8 1.1 whole rock conventional K-Ar 53. UAKA-77-60 "4.962E-04, 0.581E-04, 1.1167E-04" 2.292 1.702 age of volcanism "K=1.902, 1.904%; 40AR-RAD=171.2, 170.3, 169.0XE-12 MOL/G" 13616 1 47.8 1 sericite conventional K-Ar 54. UAKA-75-115 "4.962E-04, 0.581E-04, 1.1167E-04" 9.687 6.759 9898 "K=8.026, 8.056%; 40AR-RAD=666.4, 685.4XE-12 MOL/G" TIME OF MINERALIZATION 13617 1 47.5 1 biotite conventional K-Ar 55. UAKA-73-126 "4.962E-04, 0.581E-04, 1.1167E-04" 7.983 5.535 8686 age of later metamorphism "K=6.571, 6.683%; 40AR-RAD=554.3, 552.7XE-12 MOL/G" 13618 1 47 1 biotite conventional K-Ar 56. UAKA-72-63 "4.962E-04, 0.581E-04, 1.1167E-04" 8.67 5.937 86 "K=7.125, 7.170, 7.295%" POSSIBLY A RESET AGE 13619 1 40.1 1 biotite conventional K-Ar 56. UAKA-72-39 "4.962E-04, 0.581E-04, 1.1167E-04" 8.803 5.164 8686 "K=7.304, 7.300, 7.317%" POSSIBLY A RESET AGE 13620 1 44.1 1.3 biotite conventional K-Ar 57. HVR-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 5.483 4653 "K=7.09%; 40AR-RAD=546.3, 550.3XE-12 MOL/G" THIS IS NOT A PRIMARY AGE 13621 1 39.4 0.9 whole rock conventional K-Ar 58. UAKA-74-130 "4.962E-04, 0.581E-04, 1.1167E-04" 2.356 1.35 age of volcanism "K=1.946, 1.966%; 40AR-RAD=136.2, 136.0, 134.9, 133.0XE-12 MOL/G" 13622 1 30.3 0.6 muscovite conventional K-Ar 59. UAKA-73-70 "4.962E-04, 0.581E-04, 1.1167E-04" 10.44 4.59 7776 age of later metamorphism "K=8.686, 8.641%; 40AR-RAD=451.7, 466.2XE-12 MOL/G" "U-PB DATA SUGGESTS A JURASSIC AGE (HAXEL AND OTHERS, 1980)" 13623 1 30.1 1 biotite conventional K-Ar 60. UAKA-65-04 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 3.89 60 age of volcanism K=7.40% 13624 1 29.4 0.6 biotite conventional K-Ar 61. UAKA-73-25 "4.962E-04, 0.581E-04, 1.1167E-04" 8.112 3.464 9087 age of volcanism "K=6.707, 6.761%; 40AR-RAD=347.5, 345.4XE-12 MOL/G" 13625 1 28.6 1.9 hornblende conventional K-Ar 62. HLA-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.79 0.7805 81 maximum age of intrusion K=1.49% 13625 2 22.1 1.3 biotite conventional K-Ar 62. HLA-2 "4.962E-04, 0.581E-04, 1.1167E-04" 5.95 1.903 8286 minimum age of intrusion "K=4.94%; 40AR-RAD=182.1, 198.5XE-12 MOL/G" 13626 1 28.3 0.7 whole rock conventional K-Ar 63 GR-MY-1 "4.962E-04, 0.581E-04, 1.1167E-04" 3.49 1.433 8071 "K=2.90%; 40AR-RAD=149.5, 137.1XE-12 MOL/G" TIME OF FAULTING 13627 1 27.7 0.7 biotite conventional K-Ar 64. UAKA-63-36 "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 3.515 91 K=7.26% PROBABLY NOT A PRIMARY AGE 13628 1 27.41 0.66 whole rock conventional K-Ar 65. UAKA-73-26 "4.962E-04, 0.581E-04, 1.1167E-04" 2.089 0.827 8787 age of volcanism "K=1.715, 1.753%; 40AR-RAD=82.8, 82.6XE-12 MOL/G" 13629 1 25.8 1.6 whole rock conventional K-Ar 66. UAKA-68-09 "4.962E-04, 0.581E-04, 1.1167E-04" 1.836 0.686 27 age of volcanism "K=1.522, 1.525%" 13630 1 25.4 1.5 hornblende conventional K-Ar 67. UAKA-67-01 "4.962E-04, 0.581E-04, 1.1167E-04" 0.887 0.3256 22 age of volcanism K=0.736% 13631 1 25.33 0.54 biotite conventional K-Ar 68. UAKA-75-107 "4.962E-04, 0.581E-04, 1.1167E-04" 9.199 3.373 8584 "K=7.651, 7.622%; 40AR-RAD=338.0, 336.6XE-12 MOL/G" PROBABLY NOT A PRIMARY AGE 13632 1 24.95 0.69 biotite conventional K-Ar 69. UAKA-73-16 "4.962E-04, 0.581E-04, 1.1167E-04" 9.441 3.413 55 "K=7.810, 7.864%" PROBABLY NOT A PRIMARY AGE 13633 1 24.65 0.6 biotite conventional K-Ar 70. UAKA-74-129 "4.962E-04, 0.581E-04, 1.1167E-04" 9.021 3.222 8182 age of intrusion "K=7.453, 7.523%; 40AR-RAD=317.2, 327.1XE-12 MOL/G" 13634 1 24.35 0.73 biotite conventional K-Ar 71. UAKA-73-64 "4.962E-04, 0.581E-04, 1.1167E-04" 7.297 2.574 4647 "K=6.059, 6.054%; 40AR-RAD=259.1, 255.6XE-12 MOL/G" PROBABLY NOT A PRIMARY AGE 13635 1 23.7 0.7 biotite conventional K-Ar 72. UAKA-72-73 "4.962E-04, 0.581E-04, 1.1167E-04" 7.264 2.494 7877 age of volcanism "K=6.039, 6.022%; 40AR-RAD=253.5, 245.3XE-12 MOL/G" 13636 1 23.7 0.6 whole rock conventional K-Ar 73. UAKA-74-117 "4.962E-04, 0.581E-04, 1.1167E-04" 0.983 0.337 age of volcanism "K=0.814, 0.818%; 40AR-RAD=34.0, 33.7, 33.7, 33.5XE-12 MOL/G" 13637 1 23.6 0.62 biotite conventional K-Ar 74. UAKA-73-18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.446 2.888 6261 age of volcanism "K=6.976, 7.045%; 40AR-RAD=298.0, 279.6XE-12 MOL/G" 13638 1 23.3 2.7 whole rock conventional K-Ar 75. UAKA-70-05 "4.962E-04, 0.581E-04, 1.1167E-04" 1.072 0.3625 111310 age of volcanism "K=0.892, 0.888%; 40AR-RAD=29.07, 44.01, 35.66XE-12 MOL/G" 13639 1 22.8 0.55 biotite conventional K-Ar 76. UAKA-75-21 "4.962E-04, 0.581E-04, 1.1167E-04" 9.606 3.171 8383 "K=8.019, 7.901, 8.001%; 40AR-RAD=318.1, 316.1XE-12 MOL/G" PROBABLY NOT A PRIMARY AGE 13640 1 22.65 0.54 whole rock conventional K-Ar 77. UAKA-74-148 "4.962E-04, 0.581E-04, 1.1167E-04" 7.476 2.452 8888 age of volcanism "K=6.254, 6.158%; 40AR-RAD=246.5, 243.9XE-12 MOL/G" 13641 1 22.5 0.7 biotite conventional K-Ar 78. UAKA-67-23 "4.962E-04, 0.581E-04, 1.1167E-04" 8.3 2.7 43 age of volcanism "K=6.88, 6.90%" 13642 1 21.68 0.57 whole rock conventional K-Ar 79. UAKA-73-19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.307 0.4097 minimum age of volcanism "K=1.086, 1.083%; 40AR-RAD=39.8, 41.3, 41.8XE-12 MOL/G" 13643 1 21.37 0.53 whole rock conventional K-Ar 80. UAKA-75-04 "4.962E-04, 0.581E-04, 1.1167E-04" 0.996 0.3082 7676 age of volcanism "K=0.827, 0.827%; 40AR-RAD=30.85, 30.79XE-12 MOL/G" 13644 1 21.28 0.51 whole rock conventional K-Ar 81. UAKA-76-90 "4.962E-04, 0.581E-04, 1.1167E-04" 4.522 1.394 9090 age of volcanism "K=3.743, 3.764%; 40AR-RAD=138.1, 140.6XE-12 MOL/G" 13645 1 21.03 0.54 whole rock conventional K-Ar 82. UAKA-72-48 "4.962E-04, 0.581E-04, 1.1167E-04" 9.369 2.852 6565 minimum age of volcanism "K=7.764, 7.790%; 40AR-RAD=285.2 285.3XE-12 MOL/G" 13646 1 20.9 0.53 whole rock conventional K-Ar 83. UAKA-73-107 "4.962E-04, 0.581E-04, 1.1167E-04" 1.197 0.3624 6767 minimum age of volcanism "K=0.987, 1.002%; 40AR-RAD=36.45, 36.02XE-12 MOL/G" 13647 1 20.7 0.5 biotite conventional K-Ar 84. UAKA-75-06 "4.962E-04, 0.581E-04, 1.1167E-04" 8.282 2.479 7171 age of volcanism "K=6.902, 6.847%; 40AR-RAD=247.6, 248.2XE-12 MOL/G" 13648 1 20.7 0.5 whole rock conventional K-Ar 85. UAKA-73-33 "4.962E-04, 0.581E-04, 1.1167E-04" 0.693 0.208 37 minimum age of volcanism "K=0.578, 0.573%" 13649 1 20.6 0.62 biotite conventional K-Ar 86. UAKA-68-16 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 2.579 69 age of volcanism "K=7.183, 7.176%" 13650 1 20.44 0.45 whole rock conventional K-Ar 87. UAKA-74-39 "4.962E-04, 0.581E-04, 1.1167E-04" 0.608 0.18 6867 minimum age of volcanism "K=0.509, 0.507, 0.503, 0.501%; 40AR-RAD=18.25, 17.74XE-12 MOL/G" 13651 1 20.41 0.52 whole rock conventional K-Ar 88. UAKA-73-08 "4.962E-04, 0.581E-04, 1.1167E-04" 1.493 0.441 6566 minimum age of volcanism "K=1.233, 1.345%; 40AR-RAD=44.1, 44.1XE-12 MOL/G" 13652 1 20.36 0.4 whole rock conventional K-Ar 89. UAKA-73-31 "4.962E-04, 0.581E-04, 1.1167E-04" 3.931 1.157 6565 minimum age of volcanism "K=3.265, 3.260%; 40AR-RAD=116.2, 115.2XE-12 MOL/G" 13653 1 20.35 0.63 whole rock conventional K-Ar 90. UAKA-73-29 "4.962E-04, 0.581E-04, 1.1167E-04" 2.311 0.6815 4445 minimum age of volcanism "K=1.915, 1.921%; 40AR-RAD=67.4, 68.9XE-12 MOL/G" 13654 1 20 0.8 biotite conventional K-Ar 91. UAKA-64-21 "4.962E-04, 0.581E-04, 1.1167E-04" 8.55 2.479 63 age of volcanism "K=7.07, 7.13%" 13655 1 20 0.49 whole rock conventional K-Ar 92. UAKA-73-27 "4.962E-04, 0.581E-04, 1.1167E-04" 1.909 0.553 7575 minimum age of volcanism "K=1.599, 1.572%; 40AR-RAD=55.22, 55.37XE-12 MOL/G" 13656 1 19.98 0.58 biotite conventional K-Ar 93. UAKA-72-72 "4.962E-04, 0.581E-04, 1.1167E-04" 8.592 2.485 6768 age of intrusion "K=7.144, 7.120%; 40AR-RAD=251.7, 245.3XE-12 MOL/G" 13657 1 19.91 0.58 whole rock conventional K-Ar 94. UAKA-73-22 "4.962E-04, 0.581E-04, 1.1167E-04" 1.575 0.4536 4948 minimum age of volcanism "K=1.324, 1.290%; 40AR-RAD=45.96, 44.76XE-12 MOL/G" 13658 1 19.58 0.88 whole rock conventional K-Ar 95. UAKA-73-30 "4.962E-04, 0.581E-04, 1.1167E-04" 2.517 0.713 2826 minimum age of intrusion "K=2.083, 2.095%; 40AR-RAD=72.5, 70.1XE-12 MOL/G" 13659 1 19.58 0.53 biotite conventional K-Ar 96. UAKA-73-14 "4.962E-04, 0.581E-04, 1.1167E-04" 7.97 2.258 5655 age not evaluated "K=6.618, 6.614%; 40AR-RAD=220.7, 230.9XE-12 MOL/G" 13660 1 19.52 0.56 whole rock conventional K-Ar 97. UAKA-73-21 "4.962E-04, 0.581E-04, 1.1167E-04" 2.715 0.7667 5151 minimum age of volcanism "K=2.241, 2.267%; 40AR-RAD=77.04, 76.30XE-12 MOL/G" 13661 1 19.41 0.47 biotite conventional K-Ar 98. UAKA-74-38 "4.962E-04, 0.581E-04, 1.1167E-04" 8.898 2.5 8282 age of volcanism "K=7.387, 7.386%; 40AR-RAD=247.4, 252.5XE-12 MOL/G" 13662 1 19.4 0.47 biotite conventional K-Ar 99. UAKA-74-130 "4.962E-04, 0.581E-04, 1.1167E-04" 8.336 2.34 8484 age of volcanism "K=6.918, 6.922%; 40AR-RAD=234.1, 233.9XE-12 MOL/G" 13663 1 19.2 0.47 whole rock conventional K-Ar 100. UAKA-74-149 "4.962E-04, 0.581E-04, 1.1167E-04" 1.605 0.4456 7675 minimum age of volcanism "K=1.332, 1.331%; 40AR-RAD=45.07, 44.05XE-12 MOL/G" 13664 1 18.7 0.44 whole rock conventional K-Ar 101. UAKA-77-147 "4.962E-04, 0.581E-04, 1.1167E-04" 11.23 3.036 969696 minimum age of volcanism "K=9.330, 9.299, 9.328%; 40AR-RAD=302.3, 304.5, 304.0XE-12 MOL/G" 13665 1 18.4 0.5 biotite conventional K-Ar 102. UAKA-65-11 "4.962E-04, 0.581E-04, 1.1167E-04" 8.63 2.295 6878 age of volcanism "K=7.16%; 40AR-RAD=229.0, 230.0XE-12 MOL/G" 13665 2 18.8 1.5 plagioclase conventional K-Ar 100. UAKA-65-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.17 14 age of volcanism K=0.52% 13666 1 18.35 0.38 biotite conventional K-Ar 103. UAKA-73-109 "4.962E-04, 0.581E-04, 1.1167E-04" 9.166 2.4325 7777 minimum age of intrusion "K=7.583, 7.635%; 40AR-RAD=242.8, 243.7XE-12 MOL/G" 13667 1 18.31 0.46 whole rock conventional K-Ar 104. UAKA-77-145 "4.962E-04, 0.581E-04, 1.1167E-04" 1.291 0.3421 minimum age of volcanism "K=1.067, 1.068, 1.080%; 40AR-RAD=33.89, 34.24, 34.49XE-12 MOL/G" 13668 1 18.31 0.42 whole rock conventional K-Ar 105. UAKA-73-108 "4.962E-04, 0.581E-04, 1.1167E-04" 2.161 0.5726 6160 minimum age of volcanism "K=1.785, 1.803%; 40AR-RAD=58.30, 56.22XE-12 MOL/G" 13669 1 18.15 0.44 whole rock conventional K-Ar 106. UAKA-77-144 "4.962E-04, 0.581E-04, 1.1167E-04" 1.189 0.312 8382 minimum age of volcanism "K=0.987, 0.987%; 40AR-RAD=31.18, 31.22XE-12 MOL/G" 13670 1 18.01 0.43 whole rock conventional K-Ar 107. UAKA-77-148 "4.962E-04, 0.581E-04, 1.1167E-04" 12.86 3.35 minimum age of volcanism "K=10.715, 10.634, 10.676%; 40AR-RAD=329.2, 336.7, 339.1XE-12 MOL/G" 13671 1 17.98 0.43 biotite conventional K-Ar 108. UAKA-72-71 "4.962E-04, 0.581E-04, 1.1167E-04" 8.822 2.295 55 age of volcanism "K=7.282, 7.336, 7.350%" 13672 1 17.9 0.7 whole rock conventional K-Ar 109. UAKA-73-32 "4.962E-04, 0.581E-04, 1.1167E-04" 1.62 0.419 30 minimum age of volcanism "K=1.345, 1.345%" 13673 1 17.81 0.52 hornblende conventional K-Ar 110. UAKA-76-41 "4.962E-04, 0.581E-04, 1.1167E-04" 0.443 0.1142 4749 age of intrusion "K=0.370, 0.366%; 40AR-RAD=11.23, 11.60XE-12 MOL/G" 13674 1 17.71 0.43 sanidine conventional K-Ar 111. UAKA-77-149 "4.962E-04, 0.581E-04, 1.1167E-04" 11.16 2.86 age of volcanism "K=9.237, 9.280, 9.284%; 40AR-RAD=285.8, 286.0, 286.1, 286.2XE-12 MOL/G" 13675 1 17.4 0.5 whole rock conventional K-Ar 112. UAKA-72-42 "4.962E-04, 0.581E-04, 1.1167E-04" 7.84 1.976 4282 minimum age of volcanism "K=6.51%; 40AR-RAD=198.4, 196.7XE-12 MOL/G" 13676 1 17.24 0.43 whole rock conventional K-Ar 113. UAKA-74-37 "4.962E-04, 0.581E-04, 1.1167E-04" 1.623 0.4046 7273 minimum age of volcanism "K=1.345, 1.350%; 40AR-RAD=40.17, 40.75XE-12 MOL/G" 13677 1 16.87 0.42 whole rock conventional K-Ar 114. UAKA-73-94 "4.962E-04, 0.581E-04, 1.1167E-04" 1.858 0.453 72 minimum age of volcanism "K=1.542, 1.542%" 13678 1 16.46 0.5 biotite conventional K-Ar 115. UAKA-73-127 "4.962E-04, 0.581E-04, 1.1167E-04" 7.514 1.788 4546 "K=6.216, 6.258%; 40AR-RAD=178.1, 179.5XE-12 MOL/G" PROBABLY NOT A PRIMARY AGE 13679 1 16.28 0.4 whole rock conventional K-Ar 116. UAKA-74-04 "4.962E-04, 0.581E-04, 1.1167E-04" 1.356 0.3192 8282 minimum age of volcanism "K=1.127, 1.124%; 40AR-RAD=32.00, 31.83XE-12 MOL/G" 13680 1 16.16 0.95 whole rock conventional K-Ar 117. UAKA-68-06 "4.962E-04, 0.581E-04, 1.1167E-04" 2.108 0.4926 2524 minimum age of volcanism "K=1.726, 1.773%; 40AR-RAD=50.92, 47.61XE-12 MOL/G" 13681 1 16.14 0.75 whole rock conventional K-Ar 118. UAKA-68-07 "4.962E-04, 0.581E-04, 1.1167E-04" 2.011 0.4692 738 minimum age of volcanism "K=1.678, 1.660%; 40AR-RAD=48.82, 45.01XE-12 MOL/G" 13682 1 16.12 0.41 whole rock conventional K-Ar 119. UAKA-74-122 "4.962E-04, 0.581E-04, 1.1167E-04" 1.549 0.361 7070 minimum age of volcanism "K=1.278, 1.294%; 40AR-RAD=36.35, 35.84XE-12 MOL/G" 13683 1 15.71 0.4 whole rock conventional K-Ar 120. UAKA-72-40 "4.962E-04, 0.581E-04, 1.1167E-04" 4.889 1.11 65 minimum age of volcanism "K=4.037, 4.068, 4.068%" 13684 1 15.52 0.54 whole rock conventional K-Ar 121 UAKA-72-64 "4.962E-04, 0.581E-04, 1.1167E-04" 2.635 0.5905 minimum age of volcanism "K=2.182, 2.192%; 40AR-RAD=60.79, 59.05, 57.32XE-12 MOL/G" 13685 1 15.53 0.39 whole rock conventional K-Ar 122. UAKA-77-146 "4.962E-04, 0.581E-04, 1.1167E-04" 1.335 0.2994 6970 minimum age of volcanism "K=1.102, 1.113%; 40AR-RAD=29.48, 30.40XE-12 MOL/G" 13686 1 15.39 0.45 whole rock conventional K-Ar 123. UAKA-72-41 "4.962E-04, 0.581E-04, 1.1167E-04" 1.756 0.3906 47 minimum age of volcanism "K=1.450, 1.466%" 13687 1 15.01 0.42 whole rock conventional K-Ar 124. UAKA-73-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.691 0.15 53 minimum age of volcanism "K=0.571, 0.577%" 13688 1 14.78 0.4 whole rock conventional K-Ar 125. UAKA-77-151 "4.962E-04, 0.581E-04, 1.1167E-04" 1.697 0.3625 5858 minimum age of volcanism "K=1.404, 1.409, 1.414%; 40AR-RAD=36.23, 36.27XE-12 MOL/G" 13689 1 14.51 0.2 whole rock conventional K-Ar 126. UAKA-73-11 "4.962E-04, 0.581E-04, 1.1167E-04" 2.65 0.5555 minimum age of volcanism "K=2.196, 2.203%; 40AR-RAD=54.8, 55.4, 55.8, 56.2XE-12 MOL/G" 13690 1 14 0.32 whole rock conventional K-Ar 127. UAKA-79-55 "4.962E-04, 0.581E-04, 1.1167E-04" 1.634 0.3305 minimum age of volcanism "K=1.359, 1.352, 1.357%; 40AR-RAD=33.48, 32.77, 32.90XE-12 MOL/G" 13691 1 13.9 1.6 whole rock conventional K-Ar 128. UAKA-66-55 "4.962E-04, 0.581E-04, 1.1167E-04" 0.879 0.176 17 minimum age of volcanism "K=0.730, 0.729%" 13692 1 13.9 0.3 whole rock conventional K-Ar 129. UAKA-74-118 "4.962E-04, 0.581E-04, 1.1167E-04" 6.77 1.356 7777 minimum age of intrusion "K=5.65, 5.60%; 40AR-RAD=135.6, 135.7XE-12 MOL/G" 13693 1 13.56 0.5 whole rock conventional K-Ar 130. UAKA-65-10 "4.962E-04, 0.581E-04, 1.1167E-04" 2.19 0.4306 70 minimum age of volcanism "K=1.82, 1.83%" 13694 1 13.2 0.8 whole rock conventional K-Ar 132. UAKA-67-09 "4.962E-04, 0.581E-04, 1.1167E-04" 0.761 0.1456 30 minimum age of volcanism "K=0.630, 0.635%" 13695 1 13.1 1.6 whole rock conventional K-Ar 133. UAKA-66-28 "4.962E-04, 0.581E-04, 1.1167E-04" 1.86 0.3501 11 minimum age of volcanism "K=1.55, 1.53%" 13696 1 11.9 0.7 whole rock conventional K-Ar 134. UAKA-65-01 "4.962E-04, 0.581E-04, 1.1167E-04" 6.81 1.174 30 minimum age of intrusion K=5.65% 13697 1 11.2 0.9 whole rock conventional K-Ar 135. UAKA-66-05 "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 1.44 19 minimum age of intrusion K=7.41% 13698 1 10.52 0.61 whole rock conventional K-Ar 136. UAKA-73-139 "4.962E-04, 0.581E-04, 1.1167E-04" 1.095 0.1664 2120 minimum age of volcanism "K=0.917, 0.903%; 40AR-RAD=17.10, 16.18XE-12 MOL/G" 13699 1 10.02 0.35 whole rock conventional K-Ar 138. UAKA-74-36 "4.962E-04, 0.581E-04, 1.1167E-04" 0.585 0.0847 3737 minimum age of volcanism "K=0.484, 0.488%; 40AR-RAD=8.414, 8.534XE-12 MOL/G" 13700 1 9.62 0.38 whole rock conventional K-Ar 139. UAKA-70-13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.688 0.2342 3940 minimum age of volcanism "K=1.386, 1.386, 1.416, 1.417%; 40AR-RAD=23.21, 23.63XE-12 MOL/G" 13701 1 9.55 0.38 whole rock conventional K-Ar 140. UAKA-75-62 "4.962E-04, 0.581E-04, 1.1167E-04" 1.6 0.2206 minimum age of volcanism "K=1.336, 1.321%; 40AR-RAD=22.51, 22.03, 22.00, 21.70XE-12 MOL/G" 13702 1 8.87 0.26 whole rock conventional K-Ar 141. UAKA-76-89 "4.962E-04, 0.581E-04, 1.1167E-04" 1.394 0.1784 4848 minimum age of volcanism "K=1.164, 1.150%; 40AR-RAD=17.84, 17.85XE-12 MOL/G" 13703 1 8.8 0.36 whole rock conventional K-Ar 142. UAKA-74-82 "4.962E-04, 0.581E-04, 1.1167E-04" 0.793 0.1006 3231 minimum age of volcanism "K=0.658, 0.658%; 40AR-RAD=10.19, 9.94XE-12 MOL/G" 13704 1 8.24 0.21 whole rock conventional K-Ar 142. UAKA-74-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.496 0.059 7170 minimum age of volcanism "K=0.414, 0.412, 0.406, 0.415%; 40AR-RAD=5.87, 5.92XE-12 MOL/G" 13705 1 8.46 0.22 whole rock conventional K-Ar 143. UAKA-75-57 "4.962E-04, 0.581E-04, 1.1167E-04" 0.979 0.1195 5959 minimum age of volcanism "K=0.811, 0.816%; 40AR-RAD=12.0, 11.9XE-12 MOL/G" 13706 1 8.12 0.64 whole rock conventional K-Ar 144. UAKA-72-20 "4.962E-04, 0.581E-04, 1.1167E-04" 1.51 0.1763 201415 minimum age of volcanism "K=1.25%; 40AR-RAD=17.26, 17.70, 17.94XE-12 MOL/G" 13707 1 7.46 0.59 whole rock conventional K-Ar 145. UAKA-76-130 "4.962E-04, 0.581E-04, 1.1167E-04" 1.066 0.1147 minimum age of volcanism "K=0.889, 0.881%; 40AR-RAD=11.51, 11.45, 11.44XE-12 MOL/G" 13708 1 5.84 0.18 whole rock conventional K-Ar 146. UAKA-74-138 "4.962E-04, 0.581E-04, 1.1167E-04" 1.097 0.0923 minimum age of volcanism "K=0.909, 0.916, 0.908%; 40AR-RAD=9.35, 9.37, 9.18, 9.03XE-12 MOL/G" 13709 1 5.47 0.2 glass conventional K-Ar 147. UAKA-69-04 "4.962E-04, 0.581E-04, 1.1167E-04" 2.48 0.2158 21 age of volcanism K=2.06%; CALCULATED AGE IS AVERAGE OF 3 AGES FOR 3 DIFFERENT GLASS SAMPLES 13709 2 5.47 0.2 glass conventional K-Ar 147. UAKA-69-04 "4.962E-04, 0.581E-04, 1.1167E-04" 2.3 0.1769 10 minimum age of volcanism K=1.91%; CALCULATED AGE IS AVERAGE OF 3 AGES FOR 3 DIFFERENT GLASS SAMPLES 13709 3 5.47 0.2 glass conventional K-Ar 147. UAKA-69-04 "4.962E-04, 0.581E-04, 1.1167E-04" 2.523 0.191 2828 minimum age of volcanism "K=2.094%; 40AR-RAD=19.55, 18.66XE-12 MOL/G; CALCULATED AGE IS AVERAGE OF 3 AGES FOR 3 DIFFERENT GLASS SAMPLES" 13710 1 5.4 1 whole rock conventional K-Ar 148. UAKA-74-120 "4.962E-04, 0.581E-04, 1.1167E-04" 0.387 0.0304 minimum age of volcanism "K=0.320, 0.322%; 40AR-RAD=3.01, 3.01, 3.09XE-12 MOL/G" 13711 1 5.28 0.13 anorthoclase conventional K-Ar 149. UAKA-75-30 "4.962E-04, 0.581E-04, 1.1167E-04" 1.46 0.1145 6161 age of intrusion MEGACRYST "K=1.218, 1.197, 1.20, 1.24%; 40AR-RAD=11.4, 11.5XE-12 MOL/G" 13712 1 3.8 0.11 whole rock conventional K-Ar 150. UAKA-65-09 "4.962E-04, 0.581E-04, 1.1167E-04" 1.53 0.0838 3940 minimum age of volcanism "K=1.27%; 40AR-RAD=8.316, 8.440XE-12 MOL/G" 13713 1 3.79 0.46 whole rock conventional K-Ar 151. UAKA-64-08 "4.962E-04, 0.581E-04, 1.1167E-04" 1.518 0.0829 910 minimum age of volcanism "K=1.260, 1.260%; 40AR-RAD=7.941, 8.648XE-12 MOL/G" 13714 1 3.19 0.11 whole rock conventional K-Ar 152. UAKA-77-04 "4.962E-04, 0.581E-04, 1.1167E-04" 0.826 0.038 2931 minimum age of volcanism "K=0.683, 0.688, 0.687%; 40AR-RAD=3.69, 3.91XE-12 MOL/G" 13715 1 3.28 0.27 whole rock conventional K-Ar 153. UAKA-73-03 "4.962E-04, 0.581E-04, 1.1167E-04" 0.781 0.0368 minimum age of volcanism "K=0.648, 0.647%; 40AR-RAD=3.73, 3.71, 3.61XE-12 MOL/G" 13716 1 2.28 0.21 whole rock conventional K-Ar 153. UAKA-73-151 "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.021 1413 minimum age of volcanism "K=0.526, 0.536%; 40AR-RAD=2.14, 2.06XE-12 MOL/G" 13717 1 2.17 0.25 whole rock conventional K-Ar 153. UAKA-73-152 "4.962E-04, 0.581E-04, 1.1167E-04" 0.737 0.023 1111 minimum age of volcanism "K=0.613, 0.611%; 40AR-RAD=2.31, 2.28XE-12 MOL/G" 13718 1 2.08 0.18 whole rock conventional K-Ar 153. UAKA-73-149 "4.962E-04, 0.581E-04, 1.1167E-04" 0.645 0.0192 1517 minimum age of volcanism "K=0.534, 0.535%; 40AR-RAD=1.88, 1.96XE-12 MOL/G" 13719 1 1.92 0.42 whole rock conventional K-Ar 153. UAKA-73-09 "4.962E-04, 0.581E-04, 1.1167E-04" 1.069 0.0295 6 minimum age of volcanism "K=0.880, 0.894%" 13720 1 1.28 0.26 whole rock conventional K-Ar 153. UAKA-73-150 "4.962E-04, 0.581E-04, 1.1167E-04" 0.89 0.0164 66 minimum age of volcanism "K=0.742, 0.736%; 40AR-RAD=1.62, 1.66XE-12 MOL/G" 13721 1 2.67 0.2 whole rock conventional K-Ar 154. UAKA-73-04 "4.962E-04, 0.581E-04, 1.1167E-04" 0.648 0.0249 212 minimum age of volcanism "K=0.537, 0.539, 0.524, 0.519%; 40AR-RAD=2.54, 2.44XE-12 MOL/G" 13722 1 1.35 0.55 whole rock conventional K-Ar 154. UAKA-73-07 "4.962E-04, 0.581E-04, 1.1167E-04" 0.938 0.0182 34 minimum age of volcanism "K=0.774, 0.783%; 40AR-RAD=1.63, 2.01XE-12 MOL/G" 13723 1 1.72 0.46 whole rock conventional K-Ar 155. UAKA-73-05 "4.962E-04, 0.581E-04, 1.1167E-04" 1.084 0.0268 72 minimum age of volcanism "K=0.899, 0.901%; 40AR-RAD=2.77, 2.59XE-12 MOL/G" 13724 1 0.93 0.08 whole rock conventional K-Ar 156. UAKA-77-33 "4.962E-04, 0.581E-04, 1.1167E-04" 0.887 0.0119 minimum age of volcanism "K=0.738, 0.234%; 40AR-RAD=1.22, 1.20, 1.15XE-12 MOL/G" 13725 1 15.3 0.5 whole rock conventional K-Ar 1867 "4.962E-04, 0.581E-04, 1.1167E-04" 4.67 1.0366 57 K=3.88% THIS IS A THERMALLY REDUCED AGE 13726 1 19.1 1.3 biotite conventional K-Ar 1863 "4.962E-04, 0.581E-04, 1.1167E-04" 3.73 1.0294 24 K=3.10% THIS IS A THERMALLY REDUCED AGE 13727 1 18.5 3.3 hornblende conventional K-Ar 1892 "4.962E-04, 0.581E-04, 1.1167E-04" 3.65 0.9782 9 K=3.03% THIS IS A THERMALLY REDUCED AGE 13728 1 19.9 1.8 muscovite conventional K-Ar 1864 "4.962E-04, 0.581E-04, 1.1167E-04" 3.79 1.0938 18 K=3.15% THIS IS A THERMALLY REDUCED AGE 13729 1 21.1 4 biotite conventional K-Ar 1868 "4.962E-04, 0.581E-04, 1.1167E-04" 4.46 1.3621 6 K=3.70% THIS IS A THERMALLY REDUCED AGE 13730 1 15.5 1.2 muscovite conventional K-Ar 1869A "4.962E-04, 0.581E-04, 1.1167E-04" 6.01 1.3531 20 K=4.99% THIS IS A THERMALLY REDUCED AGE 13730 2 17.7 2.6 biotite conventional K-Ar 1869B "4.962E-04, 0.581E-04, 1.1167E-04" 7.174 1.8406 9 K=5.955% THIS IS A THERMALLY REDUCED AGE 13731 1 21.4 3.2 muscovite conventional K-Ar 1866A "4.962E-04, 0.581E-04, 1.1167E-04" 6.57 2.0291 13 K=5.45% THIS IS A THERMALLY REDUCED AGE 13731 2 26.5 6.6 biotite conventional K-Ar 1866B "4.962E-04, 0.581E-04, 1.1167E-04" 1.25 4.8131 7 K=1.04% THIS IS A THERMALLY REDUCED AGE 13732 1 16.2 1 biotite conventional K-Ar 1865 "4.962E-04, 0.581E-04, 1.1167E-04" 6.027 1.4125 23 K=5.003% THIS IS A THERMALLY REDUCED AGE 13733 1 29.9 5.4 biotite conventional K-Ar 1870B "4.962E-04, 0.581E-04, 1.1167E-04" 4.11 1.7792 10 K=3.41% THIS IS A THERMALLY REDUCED AGE 13734 1 41.8 1.3 hornblende conventional K-Ar 1870A "4.962E-04, 0.581E-04, 1.1167E-04" 1.39 5.68 50 K=1.15% THIS IS A THERMALLY REDUCED AGE 13735 1 50.2 5 hornblende conventional K-Ar 1873 "4.962E-04, 0.581E-04, 1.1167E-04" 0.701 0.5139 24 K=0.582% THIS IS A THERMALLY REDUCED AGE 13736 1 26.6 2.6 biotite conventional K-Ar 2033 "4.962E-04, 0.581E-04, 1.1167E-04" 8.11 3.1215 17 K=6.73% THIS IS A THERMALLY REDUCED AGE 13737 1 27 3.2 biotite conventional K-Ar 1990 "4.962E-04, 0.581E-04, 1.1167E-04" 6.52 2.5504 17 K=5.41% THIS IS A THERMALLY REDUCED AGE 13738 1 58.6 7 biotite conventional K-Ar 2012A "4.962E-04, 0.581E-04, 1.1167E-04" 8.37 7.1757 16 K=6.95% THIS IS A THERMALLY REDUCED AGE 13738 2 33.3 2.7 muscovite conventional K-Ar 2012B "4.962E-04, 0.581E-04, 1.1167E-04" 7.37 3.5677 20 K=6.12% THIS IS A THERMALLY REDUCED AGE 13739 1 50.9 3.6 hornblende conventional K-Ar 1985B "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 1.0022 26 K=1.12% THIS IS A THERMALLY REDUCED AGE 13740 1 135.2 6.8 biotite conventional K-Ar 2135 "4.962E-04, 0.581E-04, 1.1167E-04" 7.77 15.7025 36 K=6.45% THIS IS A THERMALLY REDUCED AGE 13741 1 25.7 1.7 biotite conventional K-Ar 1880 "4.962E-04, 0.581E-04, 1.1167E-04" 6.51 2.4275 28 age of volcanism K=5.40% 13742 1 27.6 4.7 plagioclase conventional K-Ar 1862 "4.962E-04, 0.581E-04, 1.1167E-04" 2.65 1.0616 11 minimum age of volcanism K=2.20% 13743 1 26 2.1 biotite conventional K-Ar 2022 "4.962E-04, 0.581E-04, 1.1167E-04" 7.35 2.7669 21 minimum age of volcanism K=6.10% 13744 1 31.8 3.2 biotite conventional K-Ar 2023 "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 4.0341 17 minimum age of volcanism K=7.26% 13745 1 17.1 0.8 whole rock conventional K-Ar 1871A "4.962E-04, 0.581E-04, 1.1167E-04" 12.82 3.1707 50 K=10.64%; VERY HIGH POTASSIUM VALUE FOR WHOLE-ROCK MATERIAL ANDESITE IS PROBABLY 18-19 M.Y. OLD 13746 1 18 0.8 whole rock conventional K-Ar 1871C "4.962E-04, 0.581E-04, 1.1167E-04" 11.077 2.8803 79 K=9.195%; VERY HIGH POTASSIUM VALUE FOR WHOLE-ROCK MATERIAL ANDESITE IS PROBABLY 18-19 M.Y. OLD 13747 1 18.7 0.6 whole rock conventional K-Ar 1861 "4.962E-04, 0.581E-04, 1.1167E-04" 5.76 1.5602 88 K=4.78% ANDESITE IS PROBABLY 18-19 M.Y OLD 13748 1 17.9 0.7 plagioclase conventional K-Ar 1860 "4.962E-04, 0.581E-04, 1.1167E-04" 7.58 1.9638 61 minimum age of volcanism K=6.29%; VERY HIGH POTASSIUM VALUE FOR PLAGIOCLASE 13749 1 17.3 0.9 whole rock conventional K-Ar 1884 "4.962E-04, 0.581E-04, 1.1167E-04" 12.93 3.2287 59 minimum age of volcanism K=10.73%; VERY HIGH POTASSIUM VALUE FOR WHOLE-ROCK MATERIAL 13750 1 17.1 0.5 plagioclase conventional K-Ar 1872 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 2.137 49 minimum age of volcanism K=7.18% 13751 1 15.9 2.8 plagioclase conventional K-Ar 1882 "4.962E-04, 0.581E-04, 1.1167E-04" 0.693 0.1588 7 age of volcanism K=0.575% 13752 1 19.1 0.6 plagioclase conventional K-Ar 2136 "4.962E-04, 0.581E-04, 1.1167E-04" 11.46 3.1645 46 age of volcanism K=9.51%; VERY HIGH POTASSIUM VALUE FOR PLAGIOCLASE 13753 1 24.7 4.4 whole rock conventional K-Ar 1877 "4.962E-04, 0.581E-04, 1.1167E-04" 4.23 1.5132 9 minimum age of metamorphic crystallization K=3.51% 13754 1 56.1 2 plagioclase conventional K-Ar 1887 "4.962E-04, 0.581E-04, 1.1167E-04" 4.3 3.5266 76 minimum age of volcanism K=3.57% 13847 1 159.6 5 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.64 18.347 50 minimum age of intrusion 13848 1 173.8 3 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.6392 64 age of intrusion 13849 1 40.9 0.6 biotite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.53 5.0784 76 age of volcanism 13850 1 39.2 0.6 biotite conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.45 4.8238 75 age of volcanism 13851 1 43.9 0.8 biotite conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 6.6 4.2241 67 age of intrusion 13852 1 134.9 4 hornblende conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.834 53 minimum age of intrusion "PROBABLY A REDUCED AGE, DUE TO THERMAL EFFECTS" 13853 1 14.2 0.6 muscovite conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 10.27 2.1103 34 COARSE MUSCOVITE "A REDUCED AGE, DUE TO THERMAL EFFECTS" 13854 1 13.8 0.4 whole rock conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 1.316 0.2626 48 age of volcanism 13855 1 12.1 0.3 whole rock conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 4.32 0.7533 51 age of volcanism HIGH POTASSIUM VALUE FOR WHOLE-ROCK BASALT 13856 1 12.7 0.2 whole rock conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 5.05 0.9299 72 age of volcanism HIGH POTASSIUM VALUE FOR WHOLE-ROCK BASALT 13857 1 39.4 0.5 biotite conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 4.9153 39 age of volcanism 13858 1 40.6 1.7 hornblende conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.173 0.6935 41 age of volcanism 13859 1 39 0.6 biotite conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6 4.8855 69 age of intrusion 13860 1 40.3 0.5 biotite conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 8.35 4.8963 76 age of intrusion 13861 1 41.8 0.5 biotite conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 5.0589 72 age of volcanism 13862 1 40.1 0.5 whole rock conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 2.195 1.2823 72 age of intrusion 13863 1 38.5 0.3 whole rock conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 2.355 1.3181 91 age of volcanism 13864 1 36.7 0.5 biotite conventional K-Ar 36 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 4.7503 66 age of intrusion 13865 1 38 0.5 biotite conventional K-Ar 39 "4.962E-04, 0.581E-04, 1.1167E-04" 7.48 4.139 71 age of volcanism 13866 1 21.4 2.5 whole rock conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 2.061 0.6387 25 age of volcanism 13867 1 13 whole rock conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 13868 1 39.5 0.8 biotite conventional K-Ar D1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 5.143 8585 age of intrusion "K=7.43%; 40AR-RAD=514.1, 514.5XE-12 MOL/GM" 13868 2 40 0.8 augite-ferroaugite conventional K-Ar D1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3445 0.2005 7877 age of intrusion "K=0.286%; 40AR-RAD=19.9, 20.2XE-12 MOL/GM" 13869 1 38 0.8 biotite conventional K-Ar D2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.78 5.415 8686 "K=8.12%; 40AR-RAD=539.4, 543.6XE-12 MOL/G" MAY BE THE AGE OF MINERALIZATION 13870 1 36.9 0.8 hornblende conventional K-Ar D3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.256 8080 age of intrusion K=1.043%; NO VALUES GIVEN FOR ARGON-40 13871 1 11.7 0.4 sanidine conventional K-Ar 9W-35-4-3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 1.46 86 age of intrusion 13872 1 14.4 0.4 whole rock conventional K-Ar RC-73-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.308 0.272 52 age of volcanism 13873 1 36.4 1.1 biotite conventional K-Ar RC-73-2A "4.962E-04, 0.581E-04, 1.1167E-04" 7.28 3.86 58 TUFF FORMED ABOUT 34 M.Y. AGO 13873 2 32.9 1 biotite conventional K-Ar RC-73-2A "4.962E-04, 0.581E-04, 1.1167E-04" 7.28 3.48 48 TUFF FORMED ABOUT 34 M.Y. AGO 13873 3 33.5 1 sanidine conventional K-Ar RC-73-2B "4.962E-04, 0.581E-04, 1.1167E-04" 12.22 5.95 100 TUFF FORMED ABOUT 34 M.Y. AGO 13873 4 33.3 1 sanidine conventional K-Ar RC-73-2B "4.962E-04, 0.581E-04, 1.1167E-04" 12.22 5.91 93 TUFF FORMED ABOUT 34 M.Y. AGO 13874 1 10.5 0.8 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13875 1 3.2 0.2 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13876 1 72.43 4 hornblende conventional K-Ar USGS 71700 "4.962E-04, 0.581E-04, 1.1167E-04*" 0.671 0.7139 35 age of intrusion 13895 1 50.5 0.8 sanidine conventional K-Ar MHS-64-76 "4.962E-04, 0.581E-04, 1.1167E-04" 11.23 8.275 96 age of intrusion 13896 1 50.5 1.2 sanidine conventional K-Ar MHS-294-79 "4.962E-04, 0.581E-04, 1.1167E-04" 13.87 10.21 60 age of intrusion 13897 1 48.8 1.7 sanidine conventional K-Ar MHS-256-79 "4.962E-04, 0.581E-04, 1.1167E-04" 6.12 4.36 87 age of intrusion 13898 1 38.3 0.6 sanidine conventional K-Ar MHS-71-76 "4.962E-04, 0.581E-04, 1.1167E-04" 12.28 6.833 84 age of intrusion 13900 1 29.1 1.8 whole rock conventional K-Ar DT78-20 "4.962E-04, 0.581E-04, 1.1167E-04" 1.154 0.487 61 minimum age of intrusion 13901 1 32.5 2 whole rock conventional K-Ar DT78-27B "4.962E-04, 0.581E-04, 1.1167E-04" 1.138 0.537 42 minimum age of intrusion 13902 1 27.9 1.6 whole rock conventional K-Ar DT78-28A "4.962E-04, 0.581E-04, 1.1167E-04" 1.305 0.528 45 minimum age of intrusion 13903 1 35.2 2.2 whole rock conventional K-Ar DT78-30A "4.962E-04, 0.581E-04, 1.1167E-04" 1.12 0.573 79 minimum age of volcanism 13904 1 43.4 1.9 plagioclase conventional K-Ar DT78-32A "4.962E-04, 0.581E-04, 1.1167E-04" 0.144 0.091 95 age of volcanism 13905 1 41.2 1.8 plagioclase conventional K-Ar DT78-26 "4.962E-04, 0.581E-04, 1.1167E-04" 0.202 0.1211 88 age of volcanism 13906 1 55.4 2.6 plagioclase conventional K-Ar DT78-27A "4.962E-04, 0.581E-04, 1.1167E-04" 0.238 0.193 92 A SPURIOUS AGE 13907 1 44.2 2.1 plagioclase conventional K-Ar DT78-36F "4.962E-04, 0.581E-04, 1.1167E-04" 0.221 0.1426 77 age of volcanism 13908 1 45 2.1 plagioclase conventional K-Ar DT78-31B "4.962E-04, 0.581E-04, 1.1167E-04" 0.201 0.132 91 age of volcanism 13909 1 41.7 3.1 plagioclase conventional K-Ar DT78-37A "4.962E-04, 0.581E-04, 1.1167E-04" 0.097 0.0589 96 age of volcanism 13910 1 44.4 2 plagioclase conventional K-Ar DT78-37B "4.962E-04, 0.581E-04, 1.1167E-04" 0.154 0.0997 78 age of volcanism 13911 1 39.4 2.4 hornblende conventional K-Ar VF78-115 "4.962E-04, 0.581E-04, 1.1167E-04" 0.175 0.1003 14 THE MEAN OF 4 DATES IS 42.0+/-2.4 M.Y. 13911 2 45.7 2.7 hornblende conventional K-Ar VF78-115 "4.962E-04, 0.581E-04, 1.1167E-04" 0.175 0.1167 23 THE MEAN OF 4 DATES IS 42.0+/-2.4 M.Y. 13911 3 41.7 2.4 hornblende conventional K-Ar VF78-115 "4.962E-04, 0.581E-04, 1.1167E-04" 0.175 0.1063 17 THE MEAN OF 4 DATES IS 42.0+/-2.4 M.Y. 13912 1 25 1 biotite conventional K-Ar CD-85 "4.72E-04, 0.585E-04, 1.19E-04" 7.505 54 age of volcanism K=6.230% 13913 1 23.5 0.9 biotite conventional K-Ar CD-75 "4.72E-04, 0.585E-04, 1.19E-04" 7.57 53 age of volcanism K=6.284% 13914 1 22.28 0.47 biotite conventional K-Ar CD-92 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 13915 1 22.2 0.47 biotite conventional K-Ar CD-77 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13916 1 20.39 0.43 plagioclase conventional K-Ar CD-72 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 13917 1 32 1 whole rock conventional K-Ar 779-8-3C "4.962E-04, 0.581E-04, 1.1167E-04" 1.313 0.6403 6967 minimum age of volcanism 35-60 MESH MATERIAL TREATED WITH DILUTE HF AND NITRIC ACID "40AR-RAD=6.00, 6.806XE-11 MOL/GM" 13918 1 32.7 1 whole rock conventional K-Ar 779-9-4A "4.962E-04, 0.581E-04, 1.1167E-04" 4.54 2.159 9185 minimum age of intrusion 35-60 MESH MATERIAL TREATED WITH DILUTE HF AND NITRIC ACID "40AR-RAD=2.156, 2.162XE-10 MOL/G" 13919 1 39.8 1.2 whole rock conventional K-Ar 779-14-25B "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 0.202 66 minimum age of intrusion 35-60 MESH MATERIAL TREATED WITH DILUTE HF AND NITRIC ACID "40AR-RAD=2.076, 1.970XE-11 MOL/G" 13920 1 11.8 0.6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.122 30 minimum age of volcanism 13921 1 8.15 0.3 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.553 0.065 21 minimum age of volcanism 13922 1 23.1 0.8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 1.488 65 minimum age of volcanism 13923 1 10 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.146 28 minimum age of volcanism 13924 1 12.4 0.6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.062 21 minimum age of volcanism 13925 1 12.2 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.107 28 minimum age of volcanism 13926 1 11.39 0.5 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.833 0.137 34 minimum age of volcanism 13927 1 14.7 0.6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.447 0.095 20 minimum age of volcanism 13928 1 7.02 0.4 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.602 0.061 6 minimum age of volcanism 13929 1 14.39 0.6 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 1.005 0.209 18 minimum age of volcanism 13930 1 50.7 3.1 whole rock conventional K-Ar 2. D78-SR-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.3256 19 age of volcanism 13931 1 12.2 1.7 whole rock conventional K-Ar 19. MH-20/UT-228 "4.962E-04, 0.581E-04, 1.1167E-04" 2.28 0.3983 10 age of volcanism 13932 1 10.7 0.5 whole rock conventional K-Ar 20. LCM/UT-240 "4.962E-04, 0.581E-04, 1.1167E-04" 0.965 0.1495 32 age of volcanism 13933 1 10.6 0.5 whole rock conventional K-Ar 21. MH-10/UT-227 "4.962E-04, 0.581E-04, 1.1167E-04" 0.956 0.1469 36 age of volcanism 13934 1 10.5 0.4 whole rock conventional K-Ar 22. LCM/AH-48 "4.962E-04, 0.581E-04, 1.1167E-04" 0.965 0.146 48 age of volcanism 13935 1 9.5 2.4 whole rock conventional K-Ar 23. MH-19/AH-47 "4.962E-04, 0.581E-04, 1.1167E-04" 0.945 0.13 5 age of volcanism 13936 1 9.3 0.87 hornblende conventional K-Ar 24. OMF-7A-3750/UT-224 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0309 15 age of intrusion 13937 1 61.7 3.5 whole rock conventional K-Ar 2. D78-RB-20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.497 0.4491 18 minimum age of volcanism 13938 1 61.5 1.6 whole rock conventional K-Ar 3. D78-RB-21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.621 0.5592 45 minimum age of volcanism 13939 1 59.9 1.7 whole rock conventional K-Ar 4. D78-RB-24 "4.962E-04, 0.581E-04, 1.1167E-04" 0.381 0.3342 36 minimum age of volcanism 13940 1 59.2 2.7 whole rock conventional K-Ar 5. D78-RB-25 "4.962E-04, 0.581E-04, 1.1167E-04" 0.38 0.3294 21 minimum age of volcanism 13941 1 163 4 hornblende conventional K-Ar 23. 72TNC80 "4.962E-04, 0.581E-04, 1.1167E-04" 0.415 1.0192 69 age of intrusion 13942 1 159 9 hornblende conventional K-Ar 24. 41TNC80 "4.962E-04, 0.581E-04, 1.1167E-04" 0.233 0.5506 40 age of intrusion 13943 1 147 4 hornblende conventional K-Ar 25. 63KFG "4.962E-04, 0.581E-04, 1.1167E-04" 0.7045 27 age of intrusion 13944 1 142 4 amphiboles conventional K-Ar 26. 78KJ7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7502 61 age of intrusion 13945 1 62.1 1 whole rock conventional K-Ar 8. D78-RB-15 "4.962E-04, 0.581E-04, 1.1167E-04" 1.453 1.3211 67 age of volcanism 13946 1 52.5 0.7 whole rock conventional K-Ar 9. D80-RB-31 "4.962E-04, 0.581E-04, 1.1167E-04" 0.125 0.0959 30 A SPURIOUS DATE 13947 1 15.8 0.5 whole rock conventional K-Ar 31C. 79OSJ90 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0903 43 age of volcanism 13948 1 22 8 Unk conventional K-Ar 23. 8F "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13949 1 5.9 0.6 Unk conventional K-Ar 28. 9F "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13950 1 5.5 0.5 plagioclase conventional K-Ar 16. M5-45 "4.962E-04, 0.581E-04, 1.1167E-04" 0.444 0.0349 7 age of volcanism 13951 1 16.2 1.8 whole rock conventional K-Ar 23. U-COUGAR "4.962E-04, 0.581E-04, 1.1167E-04" 0.286 0.0669 13 age of volcanism 13952 1 13.9 0.8 plagioclase conventional K-Ar 24. U-RI-85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.421 0.0838 26 age of volcanism 13953 1 11.5 0.5 plagioclase conventional K-Ar 25. UORI-112 "4.962E-04, 0.581E-04, 1.1167E-04" 0.251 0.0414 35 age of volcanism 13954 1 9.31 0.44 whole rock conventional K-Ar "26. U-BF-5, RI-136" "4.962E-04, 0.581E-04, 1.1167E-04" 0.91 0.1223 66 minimum age of intrusion 13955 1 8.93 0.34 whole rock conventional K-Ar 27. U-TMW-TOP "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 0.1726 61 age of volcanism 13956 1 8.39 0.36 whole rock conventional K-Ar 28. U-TPB-LO "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.0529 39 age of volcanism 13957 1 2.05 0.52 whole rock conventional K-Ar 29. U-FOLEY "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 0.0193 5 minimum age of volcanism 13958 1 21.3 1 Unk conventional K-Ar 30. OM-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 13959 1 18.7 0.9 Unk conventional K-Ar 31. OM-49 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 13960 1 17.3 0.7 Unk conventional K-Ar 32. OM-520 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 13961 1 24.7 2 whole rock conventional K-Ar 33. BB-16/AH-79 "4.962E-04, 0.581E-04, 1.1167E-04" 0.976 0.3489 17 A PROBABLE SPURIOUS DATE 13962 1 22 1 whole rock conventional K-Ar 34. BB-STACK/UT-199 "4.962E-04, 0.581E-04, 1.1167E-04" 0.651 0.2074 35 minimum age of volcanism 13963 1 21.9 2.9 whole rock conventional K-Ar 35. BB-30/UT-242 "4.962E-04, 0.581E-04, 1.1167E-04" 0.621 0.197 11 MAY BE A SPURIOUS DATE 13964 1 17 0.9 whole rock conventional K-Ar 36. T-14/UT-247 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8 0.1957 28 age of volcanism 13965 1 15.9 7.6 whole rock conventional K-Ar 37. BB-NSH/AH-62 "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 0.0668 3 MAY BE A SPURIOUS DATE 13966 1 15.6 0.6 whole rock conventional K-Ar 38. T-10/UT-254 "4.962E-04, 0.581E-04, 1.1167E-04" 1.33 0.2984 47 minimum age of volcanism 13967 1 14.1 0.8 whole rock conventional K-Ar 39. T-FIZZ/UT-250 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.1964 26 minimum age of volcanism 13968 1 12.4 2.5 whole rock conventional K-Ar 40. TMW1/AH-60 "4.962E-04, 0.581E-04, 1.1167E-04" 0.53 0.095 7 A PROBABLE SPURIOUS AGE 13969 1 10.2 1 whole rock conventional K-Ar 41A. MO-ENG-B/UT-232 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.034 14 age of volcanism 13969 2 9.6 1.5 whole rock conventional K-Ar 41B. MO-ENG-B/UT-241 "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0319 19 age of volcanism 13970 1 8.3 5.5 whole rock conventional K-Ar 42. BB-PAT-MT/AH-63 "4.962E-04, 0.581E-04, 1.1167E-04" 0.121 0.0145 2 MAY BE A SPURIOUS DATE 13971 1 8.1 2.3 whole rock conventional K-Ar 43. RI-28/AH-86 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.0734 5 minimum age of volcanism 13972 1 7.67 0.96 whole rock conventional K-Ar 44. MO-160/AH-49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.43 0.0476 11 minimum age of volcanism 13973 1 6.8 1.18 whole rock conventional K-Ar 45. MO-159/UT-220 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4 0.0392 8 minimum age of volcanism 13974 1 5.53 0.41 whole rock conventional K-Ar 46. P-324/AH-85 "4.962E-04, 0.581E-04, 1.1167E-04" 1.13 0.0903 19 minimum age of volcanism 13975 1 2.23 0.37 whole rock conventional K-Ar 47. MB-133/UT-222 "4.962E-04, 0.581E-04, 1.1167E-04" 0.521 0.0167 8 minimum age of volcanism 13976 1 1.98 0.25 whole rock conventional K-Ar 48. P-22/AH-73 "4.962E-04, 0.581E-04, 1.1167E-04" 0.86 0.0244 11 minimum age of volcanism 13977 1 0.98 0.34 whole rock conventional K-Ar 50. P-NOTCH/UT-239 "4.962E-04, 0.581E-04, 1.1167E-04" 1.04 0.0147 4 minimum age of volcanism 13978 1 0.97 0.46 whole rock conventional K-Ar 51. T-211/UT-251 "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 0.0115 3 minimum age of volcanism 13979 1 0.77 0.21 whole rock conventional K-Ar 52. T-208/AH-74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.75 0.0083 5 minimum age of volcanism 13980 1 0.56 0.16 whole rock conventional K-Ar 53. BB-TPBA/AH-64 "4.962E-04, 0.581E-04, 1.1167E-04" 1.42 0.0114 5 minimum age of volcanism 13981 1 0.17 0.48 whole rock conventional K-Ar 54. T-210/AH-75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.98 0.0024 1 age of volcanism 13982 1 21.7 0.8 whole rock conventional K-Ar 55. BO-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5163 44 MAY BE THE AGE OF INTRUSION 13983 1 13.4 1.2 whole rock conventional K-Ar 56. BR-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1945 89 MAY BE THE AGE OF INTRUSION 13984 1 30.9 0.4 plagioclase conventional K-Ar 72. GWW-111-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.445 0.1996 77 age of volcanism 13985 1 28.9 0.3 whole rock conventional K-Ar 73. GWW-76-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.435 0.1826 50 minimum age of volcanism 13986 1 26.5 0.3 whole rock conventional K-Ar 74. GWW-56-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.302 0.1161 50 minimum age of volcanism 13987 1 23.4 0.3 whole rock conventional K-Ar 75. GWW-191-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.207 0.0702 60 minimum age of volcanism 13988 1 14 0.3 whole rock conventional K-Ar 76. GWW-175-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.186 0.2392 54 minimum age of volcanism 13989 1 10.4 0.1 whole rock conventional K-Ar 77. GWW-87-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.62 0.2422 42 minimum age of volcanism 13990 1 7.8 0.1 whole rock conventional K-Ar 78. GWW-144-81 "4.962E-04, 0.581E-04, 1.1167E-04" 2.32 0.2598 71 minimum age of volcanism 13991 1 9.41 0.42 whole rock conventional K-Ar 79. RI-64/UT-280 "4.962E-04, 0.581E-04, 1.1167E-04" 1.67 0.2274 36 minimum age of volcanism 13992 1 7.8 0.77 whole rock conventional K-Ar 80. RI-62/AH-104 "4.962E-04, 0.581E-04, 1.1167E-04" 0.578 0.0651 14 minimum age of volcanism 13993 1 58 1.5 whole rock conventional K-Ar 5B. D78-SR-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.587 0.498 45 age of volcanism 13993 2 54.7 1.9 whole rock conventional K-Ar 5C. D78-SR-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.587 0.4692 48 age of volcanism 13994 1 58.2 0.2 whole rock conventional K-Ar 6B. D78-SR-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.39 0.3245 87 age of volcanism 13994 2 57.6 0.9 whole rock conventional K-Ar 6C. D78-SR-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.39 0.3211 82 age of volcanism 13995 1 56.8 1.9 whole rock conventional K-Ar 7B. D78-SR-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.334 0.2687 40 age of volcanism 13995 2 55.4 1.2 whole rock conventional K-Ar 7C. D78-SR-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.334 0.2641 59 age of volcanism 13996 1 52.8 1 whole rock conventional K-Ar 8. D78-SR-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.876 0.6762 62 minimum age of volcanism 13997 1 9.5 1.3 whole rock conventional K-Ar 38. DC-4/UT-277 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8 0.1089 10 age of volcanism 13998 1 6.3 0.22 whole rock conventional K-Ar 39. DC-114/UT-278 "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 0.1762 53 age of volcanism 13999 1 6 0.9 whole rock conventional K-Ar 40. DC-14/AH-101 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.0514 9 age of volcanism 14000 1 5.34 0.58 whole rock conventional K-Ar 41. DEVILS 440/AH-102 "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.0492 3 A SPURIOUS DATE 14001 1 55.8 1.5 whole rock conventional K-Ar 11B. D78-TM-8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.138 0.1125 44 minimum age of volcanism 14001 2 55.9 1.6 whole rock conventional K-Ar 11C. D78-TM-8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.138 0.1128 45 minimum age of volcanism 14002 1 54.8 1 whole rock conventional K-Ar 12. D78-TM-6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.448 1.1337 68 minimum age of volcanism 14003 1 52.9 1 whole rock conventional K-Ar 13. D78-TM-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.628 0.4735 58 minimum age of volcanism 14004 1 47.5 5.7 Unk conventional K-Ar 7. 108-WB "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 14005 1 41.1 2.8 Unk conventional K-Ar 8. 107-WB "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 14006 1 7.6 0.8 Unk conventional K-Ar 10. 101-WB "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 14007 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK1 "4.72E-04, 0.584E-04, 1.19E-04" 574 age of volcanism ROCK SLIGHTLY ALTERED 11-POINT WHOLE-ROCK ISOCHRON--40AR/36AR VERSUS 39AR/36AR 14007 2 14.5 0.3 whole rock 39Ar-40Ar total fusion NK1-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.4908 47 age of volcanism ROCK CHUNKS INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14007 3 13.9 0.2 whole rock 39Ar-40Ar total fusion NK1-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.477 42 age of volcanism 12-200 MESH RANGE INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14007 4 15 0.3 whole rock 39Ar-40Ar total fusion NK1-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2838 40 maximum age of volcanism 12-200 MESH RANGE (SAMPLE LISTED AS NK11-2I IN ONE PLACE--COMPILER) INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14008 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK11 "4.72E-04, 0.584E-04, 1.19E-04" 574 age of volcanism SOME ALTERATION OF PRIMARY MINERALS 11-POINT WHOLE-ROCK ISOCHRON--40AR/36AR VERSUS 39AR/36AR 14008 2 13.9 0.6 whole rock 39Ar-40Ar total fusion NK11-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2517 3 age of volcanism 12-200 MESH RANGE INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14008 3 16 0.7 whole rock 39Ar-40Ar total fusion NK11-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.1254 30 12-200 MESH RANGE INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA AGE IS PROBABLY TOO OLD 14008 4 14.8 1.5 whole rock 39Ar-40Ar total fusion NK11-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.195 45 maximum age of volcanism 12-200 MESH RANGE INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14008 5 13.7 0.2 whole rock 39Ar-40Ar total fusion NK11-1I "4.72E-04, 0.584E-04, 1.19E-04" 0.1236 27 minimum age of volcanism 12-200 MESH RANGE INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14009 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK14 "4.72E-04, 0.584E-04, 1.19E-04" 574 age of volcanism ROCK CONTAINS SIGNIFICANT SECONDARY MINERALS 11-POINT WHOLE-ROCK ISOCHRON--40AR/36AR VERSUS 39AR/36AR 14009 2 12.7 0.3 whole rock 39Ar-40Ar total fusion NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.0946 16 12-200 MESH RANGE; CONSIDERABLE SECONDARY MINERALS PRESENT INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA AGE IS APPARENTLY TOO YOUNG 14009 3 14.6 0.6 whole rock 39Ar-40Ar total fusion NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.1124 22 age of volcanism 12-200 MESH RANGE; CONSIDERABLE SECONDARY MINERALS PRESENT INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14009 4 22.1 20 whole rock conventional K-Ar NK14-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.2454 7 CHUNK-SIZE MATERIAL NO POTASSIUM VALUE GIVEN SPURIOUS AGE--TOO OLD 14010 1 14.3 0.3 whole rock 40Ar/36Ar-40K/36Ar isochron NK16 "4.72E-04, 0.584E-04, 1.19E-04" 574 age of volcanism SOME ALTERATION 11-POINT WHOLE-ROCK ISOCHRON--40AR/36AR VERSUS 39AR/36AR 14010 2 13.8 0.7 whole rock 39Ar-40Ar total fusion NK16-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2093 52 minimum age of volcanism 12-200 MESH RANGE INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14010 3 14.4 0.2 whole rock 39Ar-40Ar total fusion NK16-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.2044 34 age of volcanism 12-200 MESH RANGE (SAMPLE LISTED AS NK11-1I IN TABLE 1--COMPILER) INTEGRATED 40-39 DATA; SEE ARTICLE FOR STEP-HEATING DATA 14010 4 14.4 0.3 whole rock conventional K-Ar NK16-2I "4.72E-04, 0.584E-04, 1.19E-04" 0.0223 74 age of volcanism 12-200 MESH RANGE NO POTASSIUM VALUE GIVEN 14011 1 14 0.6 whole rock conventional K-Ar NK5-2 "4.72E-04, 0.584E-04, 1.19E-04" 0.29 36 age of volcanism 12-200 MESH RANGE NO POTASSIUM VALUE GIVEN "WATKINS AND BAKSI, 1974, REPORTED AN AGE OF 13.4 M.Y. FOR THIS LAVA FLOW" 14012 1 374 14 whole rock conventional K-Ar (NONE GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "AN APPROXIMATE AGE FOR THE META-BENTONITE(?). THIS AGE ALSO REPORTED IN USGS OPEN-FILE REPORT 78-668, 1978" 14016 1 346 12 whole rock conventional K-Ar (NONE GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "MINIMUM AGE FOR META-IGNEOUS ROCK. THIS AGE ALSO GIVEN IN USGS OPEN-FILE REPORT 78-668, 1978" 14018 1 159 6 whole rock conventional K-Ar (NONE GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN "A SPURIOUS AGE; AGE IS PROBABLY AROUND 355 M.Y.; THIS AGE ALSO REPORTED IN USGS OPEN-FILE REPORT 78-668, 1978" 14020 1 784 16 whole rock conventional K-Ar TRD5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.517 7.31 91 K=0.429% SPURIOUS AGE--TOO OLD; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14021 1 905 18 whole rock conventional K-Ar TRD6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.307 5.2 89 K=0.255% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14021 2 1145 25 pyroxenes conventional K-Ar TRD6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.139 3.189 89 A MIXTURE OF PYROXENE AND OLIVINE K=0.115% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14021 3 796 18 plagioclase conventional K-Ar TRD6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.477 6.87 80 K=0.396% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14022 1 595 12 whole rock conventional K-Ar TRD7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.582 5.9 94 K=0.483% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14023 1 693 14 whole rock conventional K-Ar TRD8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.488 5.93 91 K=0.405% SPURIOUS AGE; THE DIKE IS PROBABLY AROUND 190 M.Y. OLD 14024 1 1500 30 whole rock conventional K-Ar TRD12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.516 17.36 95 K=0.428% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14025 1 703 12 whole rock conventional K-Ar TRD16 "4.962E-04, 0.581E-04, 1.1167E-04" 6.98 4691 "K=0.443, 0.494%; 40AR-RAD=7.13, 6.83XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14026 1 729 12 whole rock conventional K-Ar TRD24A "4.962E-04, 0.581E-04, 1.1167E-04" 6.31 90 "K=0.392, 0.418%" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14026 2 633 14 pyroxenes conventional K-Ar TRD24A "4.962E-04, 0.581E-04, 1.1167E-04" 0.205 2.235 83 PYROXENE-OLIVINE MIXTURE K=0.170% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14026 3 679 14 plagioclase conventional K-Ar TRD24A "4.962E-04, 0.581E-04, 1.1167E-04" 0.666 7.9 92 K=0.553% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14027 1 583 12 whole rock conventional K-Ar TRD25 "4.962E-04, 0.581E-04, 1.1167E-04" 0.567 5.62 96 K=0.471% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14028 1 484 11 whole rock conventional K-Ar TRD27 "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 3.51 81 K=0.365% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14029 1 578 13 whole rock conventional K-Ar TRD28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.443 4.345 75 K=0.368% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14030 1 304 7 whole rock conventional K-Ar D4 "4.962E-04, 0.581E-04, 1.1167E-04" 2.632 81 "K=0.456, 0.462%" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14031 1 284 5 whole rock conventional K-Ar D5 "4.962E-04, 0.581E-04, 1.1167E-04" 2.1985 6982 "K=0.406, 0.418%; 40AR=2.161, 2.236XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14032 1 247 6 whole rock conventional K-Ar D6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.466 1.777 58 K=0.387% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14033 1 256 6 whole rock conventional K-Ar D9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.447 1.767 65 K=0.371% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14034 1 190 4 whole rock conventional K-Ar G2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.582 86 age of intrusion "K=0.451, 0.460%" 14035 1 211 3 whole rock conventional K-Ar G3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.8395 8887 "K=0.467, 0.481%; 40AR-RAD=1.824, 1.855XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14036 1 301 5 whole rock conventional K-Ar G8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9935 6264 "K=0.173, 0.177%; 40AR-RAD=0.977, 1.010XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14037 1 205 6 whole rock conventional K-Ar BI4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.584 5525 "K=0.144, 0.167%; 40AR-RAD=0.605, 0.563XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14038 1 435 7 whole rock conventional K-Ar JH3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.945 6270 "K=0.226, 0.230%; 40AR-RAD=1.929, 1.961XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M..Y. OLD 14039 1 1628 25 whole rock conventional K-Ar C3 "4.962E-04, 0.581E-04, 1.1167E-04" 11.34 9595 "K=0.253, 0.244, 0.245%; 40AR-RAD=11.28, 11.40XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14040 1 222 5 whole rock conventional K-Ar GR7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.448 5648 "K=0.109, 0.110%; 40AR-RAD=0.456, 0.440XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14041 1 194 3 whole rock conventional K-Ar R9 "4.962E-04, 0.581E-04, 1.1167E-04" 1.6675 7762 age of intrusion "K=0.469, 0.470, 0.468%; 40AR-RAD=1.667, 1.668XE-10 MOL/G" 14042 1 252 4 whole rock conventional K-Ar R18 "4.962E-04, 0.581E-04, 1.1167E-04" 2.3945 8476 "K=0.503, 0.522, 0.505%; 40AR-RAD=2.424, 2.365XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14043 1 196 4 whole rock conventional K-Ar N3 "4.962E-04, 0.581E-04, 1.1167E-04" 2.346 86 age of intrusion "K=0.655, 0.663, 0.645%" 14044 1 249 5 whole rock conventional K-Ar P2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.946 76 "K=0.202, 0.206%" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14045 1 227 5 whole rock conventional K-Ar JA9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.926 45 "K=0.211, 0.235, 0.217%" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14046 1 194 3 whole rock conventional K-Ar ME13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3095 8589 age of intrusion "K=0.377, 0.367, 0.361, 0.370%; 40AR-RAD=1.288, 1.331XE-10 MOL/G" 14047 1 222 4 whole rock conventional K-Ar T8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.833 8488 "K=0.438, 0.456%; 40AR-RAD=1.858, 1.808XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14048 1 192 4 whole rock conventional K-Ar JO7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.625 1.827 82 age of intrusion K=0.519% 14049 1 230 4 whole rock conventional K-Ar M8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.203 7571 "K=0.285, 0.281%; 40AR-RAD=1.192, 1.214XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14050 1 192 2 whole rock conventional K-Ar TA12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.656 796647 age of intrusion "K=0.185, 0.185, 0.190%; 40AR-RAD=0.669, 0.650, 0.649XE-10 MOL/G" 14051 1 509 7 whole rock conventional K-Ar B11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.466 3.9465 9189 "K=0.387%; 40AR-RAD=3.956, 3.937XE-10 MOL/G" SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14052 1 186 12 whole rock conventional K-Ar GGS4780 "4.962E-04, 0.581E-04, 1.1167E-04" 0.288 0.812 17 minimum age of intrusion K=0.239% 14053 1 202 15 whole rock conventional K-Ar GCS4820 "4.962E-04, 0.581E-04, 1.1167E-04" 0.251 0.772 15 K=0.208% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14054 1 209 14 whole rock conventional K-Ar GGS4850 "4.962E-04, 0.581E-04, 1.1167E-04" 0.36 1.151 16 K=0.299% SPURIOUS AGE; DIKE IS PROBABLY AROUND 190 M.Y. OLD 14055 1 391 10 whole rock conventional K-Ar TRD2A "4.962E-04, 0.581E-04, 1.1167E-04" 0.165 1.038 67 K=0.137% A COOLING AGE 14056 1 412 10 whole rock conventional K-Ar TRD1A "4.962E-04, 0.581E-04, 1.1167E-04" 0.154 1.026 61 K=0.128% A COOLING AGE 14057 1 279 6 hornblende conventional K-Ar WRG-1HH "4.962E-04, 0.581E-04, 1.1167E-04" 0.296 1.289 96 K=0.246% A COOLING AGE 14058 1 216 4 biotite conventional K-Ar JWS-1M "4.962E-04, 0.581E-04, 1.1167E-04" 8.26 27.35 92 K=6.86% A COOLING AGE (HYBRID AGE) 14059 1 270 5 biotite conventional K-Ar JWS-3CHLW "4.962E-04, 0.581E-04, 1.1167E-04" 9.44 39.53 98 K=7.84% A COOLING AGE 14060 1 480 17 whole rock conventional K-Ar GGS-153 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14061 1 230 35 whole rock conventional K-Ar GGS338 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN SPURIOUS AGE--TOO YOUNG 14062 1 425 14 whole rock conventional K-Ar GGS338 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14063 1 460 15 whole rock conventional K-Ar GGS651 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14064 1 165 6 whole rock conventional K-Ar GGS3127 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN PROBABLY A SPURIOUS AGE--TOO YOUNG 14065 1 195 11 whole rock conventional K-Ar GGS3128 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN 14066 1 298 whole rock conventional K-Ar GGS3201 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN MAY BE A SPURIOUS DATE--TOO YOUNG 14067 1 187 1.3 whole rock 39Ar-40Ar incremental (plateau) BBH-1 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR 40-39AR ANALYTICAL DATA; THIS IS A WEIGHTED PLATEAU AGE THE BEST AGE FOR THE BASALT IS 184 M.Y. 14067 2 192 15.4 whole rock 40Ar/36Ar-40K/36Ar isochron BBH-1 "4.962E-04, 0.581E-04, 1.1167E-04" 4-POINT ISOCHRON--40AR/36AR VERSUS 39AR/36AR; SEE ARTICLE FOR ANALYTICAL DATA THE BEST AGE FOR THE BASALT IS 184 M.Y. 14068 1 161 3.1 whole rock 39Ar-40Ar incremental (plateau) BBH-3 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR 40-39AR ANALYTICAL DATA; THIS IS A WEIGHTED PLATEAU AGE THE BEST AGE FOR THE BASALT IS 184 M.Y. 14068 2 167 2 whole rock 40Ar/36Ar-40K/36Ar isochron BBH-3 "4.962E-04, 0.581E-04, 1.1167E-04" 4-POINT ISOCHRON--40AR/36AR VERSUS 39AR/36AR; SEE ARTICLE FOR ANALYTICAL DATA THE BEST AGE FOR THE BASALT IS 184 M.Y. 14069 1 187 3.1 whole rock 39Ar-40Ar incremental (plateau) BBH-5 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR 40-39AR ANALYTICAL DATA; THIS IS A WEIGHTED PLATEAU AGE FOR 500-900C-DEGREES THE BEST AGE FOR THE BASALT IS 184 M.Y. 14069 2 183 2.6 whole rock 39Ar-40Ar incremental (plateau) BBH-5 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR 40-39AR ANALYTICAL DATA; THIS IS A WEIGHTED PLATEAU AGE FOR 500-1050C-DEGREES THE BEST AGE FOR THE BASALT IS 184 M.Y. 14069 3 184 3.3 whole rock 40Ar/36Ar-40K/36Ar isochron BBH-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 5-POINT ISOCHRON--40AR/36AR VERSUS 39AR/36AR FOR 500-900C-DEGREES; SEE ARTICLE FOR ANALYTICAL DATA 14069 4 175 1 whole rock 40Ar/36Ar-40K/36Ar isochron BBH-5 "4.962E-04, 0.581E-04, 1.1167E-04" 7-POINT ISOCHRON--40AR/36AR VERSUS 39AR/36AR FOR 500-1050C-DEGREES; SEE ARTICLE FOR ANALYTICAL DATA THE BEST AGE FOR THE BASALT IS 184 M.Y. 14070 1 109 4 whole rock conventional K-Ar B-5A "4.72E-04, 0.585E-04, 1.19E-04" 2.309 85 "THE BEST AGE FOR THIS BASALT IS 184 M.Y. (LANPHERE, 1983)" 14071 1 204 4.1 whole rock conventional K-Ar 1-Jan "4.962E-04, 0.581E-04, 1.1167E-04" 0.992 3.032 8580 "40AR-RAD=3.010, 3.054XE-10 MOL/G" "THE BEST AGE FOR THIS BASALT IS 184 M.Y. (LANPHERE, 1983)" 14072 1 162 3.2 whole rock conventional K-Ar 1-Jan "4.962E-04, 0.581E-04, 1.1167E-04" 0.355 0.8673 5655 "40AR-RAD=0.8702, 0.8643XE-10 MOL/G" "THE BEST AGE FOR THIS BASALT IS 184 M.Y. (LANPHERE, 1983)" 14073 1 186 3.7 whole rock conventional K-Ar 1-Jan "4.962E-04, 0.581E-04, 1.1167E-04" 0.259 0.7317 6064 "40AR-RAD=0.7266, 0.7368XE-10 MOL/G" "THE BEST AGE FOR THIS BASALT IS 184 M.Y. (LANPHERE, 1983)" 14074 1 334 4.8 Unk conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 14075 1 267 10 Unk conventional K-Ar (NOT GIVEN) no decay constants given minimum age of volcanism PROBABLY A WHOLE-ROCK SAMPLE NO ANALYTICAL DATA GIVEN 14076 1 172 whole rock conventional K-Ar 1 no decay constants given minimum age of volcanism NO ANALYTICAL DATA GIVEN 14076 2 148 whole rock conventional K-Ar 2 no decay constants given NO ANALYTICAL DATA GIVEN 14077 1 203 12 whole rock conventional K-Ar 1 no decay constants given NO ANALYTICAL DATA GIVEN 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14077 2 182 11 whole rock conventional K-Ar 2 no decay constants given NO ANALYTICAL DATA GIVEN 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14077 3 186 9 pyroxenes conventional K-Ar 3 no decay constants given NO ANALYTICAL DATA GIVEN 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14077 4 195 12 whole rock conventional K-Ar 4 no decay constants given NO ANALYTICAL DATA GIVEN 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14077 5 153 61 Unk conventional K-Ar 5 no decay constants given NO ANALYTICAL DATA GIVEN AGE IS TOO LOW; 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14078 1 181 72 pyroxenes conventional K-Ar 6 no decay constants given NO ANALYTICAL DATA GIVEN 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14078 2 129 60 pyroxenes conventional K-Ar 7 no decay constants given NO ANALYTICAL DATA GIVEN AGE IS TOO LOW; 5 K-AR AGES FOR THIS CORE CLUSTER AROUND 180-200 M.Y. 14079 1 171 3 K feldspar conventional K-Ar 1 no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 14079 2 169 3 K feldspar conventional K-Ar 2 no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 14097 1 16.7 0.3 muscovite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 2.5378 64 A RESET AGE 14098 1 4 0.5 muscovite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 10.34 2.0966 32 A RESET AGE 14099 1 11.2 1.1 muscovite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 10.59 1.7084 17 A RESET AGE 14100 1 322 27 hornblende conventional K-Ar 1. G-45 "4.962E-04, 0.581E-04, 1.1167E-04" 0.268 1.3596 16 minimum age of metamorphic crystallization 14101 1 273 5 biotite conventional K-Ar 2. G-48 "4.962E-04, 0.581E-04, 1.1167E-04" 7.38 31.361 92 PINK-RED-BLACK MICA (POSSIBLY ALTERED) MINIMUM AGE FOR METAMORPHIC EVENT IS 345 M.Y. 14102 1 113 3 mariposite conventional K-Ar 3. 311 "4.962E-04, 0.581E-04, 1.1167E-04" 10.1 16.944 90 "NEARLY PURE, MASSIVE GREEN MARIPOSITE (CHROMIAN PHENGITE)" MAY BE THE TIME OF GOLD MINERALIZATION 14103 1 345 9 hornblende conventional K-Ar 4. 342 "4.962E-04, 0.581E-04, 1.1167E-04" 0.869 4.7514 65 minimum age of metamorphic crystallization ABOUT 5% ALTERED PLAGIOCLASE PRESENT 14104 1 143 5 hornblende conventional K-Ar 5. 376 "4.962E-04, 0.581E-04, 1.1167E-04" 0.491 1.0488 38 minimum age of intrusion "IMPURITIES 4-5%, MAINLY EPIDOTE" 14105 1 112 3 mariposite conventional K-Ar 6. 504 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 15.265 98 PALE-GREEN MARIPOSITE WITH AROUND 1% SULFIDE MAY BE THE TIME OF GOLD MINERALIZATION 14106 1 18.7 0.3 whole rock conventional K-Ar CH-49(WR) "4.962E-04, 0.581E-04, 1.1167E-04" 2.32 0.628 62 age of volcanism 14107 1 13.7 0.2 sanidine conventional K-Ar CHNW-154(SAN) "4.962E-04, 0.581E-04, 1.1167E-04" 11.29 2.229 58 age of volcanism 14108 1 11.3 0.7 whole rock conventional K-Ar CHSE-135A(WR) "4.962E-04, 0.581E-04, 1.1167E-04" 1.181 0.1933 24 age of volcanism 14109 1 9.2 0.3 whole rock conventional K-Ar AP-19(WR) "4.962E-04, 0.581E-04, 1.1167E-04" 2.33 0.3079 39 age of volcanism 14110 1 8.6 0.3 whole rock conventional K-Ar MSMF(WR) "4.962E-04, 0.581E-04, 1.1167E-04" 1.166 0.1439 35 age of volcanism 14111 1 5.4 0.6 plagioclase conventional K-Ar CH-79(PLG) "4.962E-04, 0.581E-04, 1.1167E-04" 0.563 0.0436 15 age of volcanism 14115 1 11.8 0.3 whole rock conventional K-Ar UAKA79-119 "4.962E-04, 0.581E-04, 1.1167E-04" 1.079 0.1835 5455 age of volcanism "K=0.893, 0.892, 0.903%; 40AR-RAD=0.1815, 0.1820, 0.1836, 0.1848, 0.1834, 0.1837, 0.1854XE-10 MOL/G" 14116 1 3.9 0.2 whole rock conventional K-Ar UAKA79-120 "4.962E-04, 0.581E-04, 1.1167E-04" 1.063 0.0599 age of volcanism "K=0.882, 0.877, 0.880, 0.889%; 40AR-RAD=6.15, 6.03, 5.66, 6.11XE-12 MOL/G" 14117 1 5.2 0.1 whole rock conventional K-Ar UAKA79-121 "4.962E-04, 0.581E-04, 1.1167E-04" 0.828 6.16 age of intrusion "K=0.685, 0.687, 0.690%; 40AR-RAD=6.00, 6.18, 6.31XE-12 MOL/G" 14118 1 3 0.07 whole rock conventional K-Ar UAKA79-122 "4.962E-04, 0.581E-04, 1.1167E-04" 1.949 0.0832 5556 age of volcanism "K=1.616, 1.607, 1.630%; 40AR-RAD=8.302, 8.333XE-12 MOL/G" 14119 1 4.2 0.1 whole rock conventional K-Ar UAKA79-123 "4.962E-04, 0.581E-04, 1.1167E-04" 1.934 0.1176 83843334 age of volcanism "K=1.603, 1.611, 1.601%; 40AR-RAD=11.42, 11.79, 11.60, 12.22XE-12 MOL/G" 14120 1 28.1 0.6 whole rock conventional K-Ar UAKA79-124 "4.962E-04, 0.581E-04, 1.1167E-04" 3.783 1.544 97 age of volcanism "K=3.171, 3.123, 3.127%; 40AR-RAD=1.525, 1.550, 1.557XE-10 MOL/G" 14121 1 18.3 0.4 whole rock conventional K-Ar UAKA79-125 "4.962E-04, 0.581E-04, 1.1167E-04" 2.952 0.7805 8887 age of volcanism "K=2.451, 2.444, 2.457%; 40AR-RAD=0.7731, 0.7845, 0.7839XE-10 MOL/G" 14122 1 4.8 0.1 whole rock conventional K-Ar UAKA79-126 "4.962E-04, 0.581E-04, 1.1167E-04" 1.358 0.0943 age of volcanism "K=1.124, 1.123, 1.126, 1.127, 1.131, 1.133%; 40AR-RAD=9.37, 9.38, 9.54XE-12 MOL/G" 14123 1 3.1 0.1 whole rock conventional K-Ar UAKA79-127 "4.962E-04, 0.581E-04, 1.1167E-04" 1.475 0.0663 6766 age of volcanism "K=1.222, 1.222, 1.228%; 40AR-RAD=6.61, 6.62, 6.67XE-12 MOL/G" 14124 1 7.1 0.2 whole rock conventional K-Ar UAKA79-128 "4.962E-04, 0.581E-04, 1.1167E-04" 1.428 0.1457 7678 age of volcanism "K=1.184, 1.179, 1.194%; 40AR-RAD=0.1488, 0.1442, 0.1440XE-10 MOL/G" GEOCHRON OBTAINED AN AGE OF 13.5+/-0.9 M.Y. FOR THIS FLOW 14125 1 0.53 0.04 whole rock conventional K-Ar UAKA79-130 "4.962E-04, 0.581E-04, 1.1167E-04" 1.667 0.0128 1411 age of volcanism "K=1.384, 1.384, 1.383%; 40AR-RAD=1.131, 1.274, 1.429XE-12 MOL/G" 14126 1 1.2 0.06 whole rock conventional K-Ar UAKA79-132 "4.962E-04, 0.581E-04, 1.1167E-04" 1.655 0.0292 2423 age of volcanism "K=1.373, 1.374, 1.374%; 40AR-RAD=2.79, 3.05XE-12 MOL/G" 14127 1 4.5 0.1 whole rock conventional K-Ar UAKA79-139 "4.962E-04, 0.581E-04, 1.1167E-04" 1.67 0.1088 5657 age of volcanism "K=1.386, 1.389, 1.389, 1.389, 1.379%; 40AR-RAD=0.1075, 0.1081, 0.1107XE-10 MOL/G" 14128 1 0.55 0.03 whole rock conventional K-Ar D2719R "4.962E-04, 0.581E-04, 1.1167E-04" 1.71 0.0135 8 age of volcanism "K=1.403, 1.436%" "PREVIOUSLY DATED AT 2.68+/-0.35, 0.165+/-0.079, AND 0.131+/-0.013 M.Y. BY GEOCHRON AND MOBIL LABS" 14129 1 0.53 0.03 whole rock conventional K-Ar D2720R "4.962E-04, 0.581E-04, 1.1167E-04" 1.365 0.0105 10 age of volcanism "K=1.146, 1.121%" "PREVIOUSLY DATED AT 0.52+/-0.10, 0.144+/-0.077, AND 0.106+/0.086 M.Y. BY GEOCHRON AND MOBIL LABS" 14130 1 0.49 0.03 whole rock conventional K-Ar D2725R "4.962E-04, 0.581E-04, 1.1167E-04" 1.8 1.267 9 age of volcanism "K=1.503, 1.486%" "PREVIOUSLY DATED AT 1.91+/-0.10, 0.232+/-0.080, AND 0.154+/-0.119 M.Y. BY GEOCHRON AND MOBIL LABS" 14131 1 9.8 0.4 whole rock conventional K-Ar D2896R "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.1463 26 age of volcanism "K=0.822, 0.822, 0.872, 0.905%" PREVIOUSLY DATED AT 9.3 M.Y. BY MOBIL LAB AND 13.2 M.Y. BY GEOCHRON 14144 1 158.07 10 biotite conventional K-Ar 98-V "4.72E-04, 0.585E-04, 1.19E-04*" 5.76 13.7 52 age of volcanism K=4.78% 14145 1 20.4 0.6 whole rock conventional K-Ar CD-9 "4.962E-04, 0.581E-04, 1.1167E-04" 10.44 45 age of intrusion RADIOGENIC AR CONTENT NOT GIVEN 14146 1 19 1.2 plagioclase conventional K-Ar CD-2 "4.962E-04, 0.581E-04, 1.1167E-04" 5.43 28 age of intrusion RADIOGENIC AR CONTENT NOT GIVEN 14147 1 24.2 1 biotite conventional K-Ar 1. CY81-5 "4.962E-04, 0.581E-04, 1.1167E-04" 2.653 45 age of intrusion 14148 1 25.28 0.7 biotite conventional K-Ar 65I096 "4.72E-04, 0.585E-04, 1.19E-04*" 8.82 3.233 63 age of volcanism 14148 2 23.11 0.7 sanidine conventional K-Ar 65I094 "4.72E-04, 0.585E-04, 1.19E-04*" 6.66 2.23 89 AGE IS APPARENTLY TOO YOUNG 14149 1 26.41 0.8 biotite conventional K-Ar KA418 "4.72E-04, 0.585E-04, 1.19E-04*" 8.51 3.26 77 age of volcanism 14149 2 23.48 0.7 sanidine conventional K-Ar KA427 "4.72E-04, 0.585E-04, 1.19E-04*" 8.03 2.732 92 AGE IS APPARENTLY TOO YOUNG 14150 1 24.44 0.7 biotite conventional K-Ar 65I099 "4.72E-04, 0.585E-04, 1.19E-04*" 8.47 3 62 minimum age of volcanism 14151 1 27.2 0.8 biotite conventional K-Ar KA154 "4.72E-04, 0.585E-04, 1.19E-04*" 8.14 3.212 74 age of volcanism 14151 2 26.26 0.8 sanidine conventional K-Ar 65I095 "4.72E-04, 0.585E-04, 1.19E-04*" 8.68 3.305 97 minimum age of volcanism 14152 1 26.7 0.8 biotite conventional K-Ar 75I316 "4.72E-04, 0.585E-04, 1.19E-04" 3.178 87 age of volcanism 14153 1 27.4 0.8 biotite conventional K-Ar 75I310 "4.72E-04, 0.585E-04, 1.19E-04" 3.424 17 age of intrusion 14154 1 28.2 0.8 biotite conventional K-Ar 75I307 "4.72E-04, 0.585E-04, 1.19E-04" 3.59 81 age of volcanism 14155 1 26.5 0.8 biotite conventional K-Ar 75I314 "4.72E-04, 0.585E-04, 1.19E-04" 3.339 50 minimum age of volcanism 14156 1 80.98 1.6 biotite conventional K-Ar SC4 "4.72E-04, 0.585E-04, 1.19E-04*" 8.52 10.16 92 "K=7.05, 7.09%" A REDUCED AGE 14156 2 85.64 1.7 hornblende conventional K-Ar SC4 "4.72E-04, 0.585E-04, 1.19E-04*" 1.77 2.235 61 "K=1.47, 1.47%" A REDUCED AGE 14157 1 95.5 3.4 hornblende conventional K-Ar SC32A "4.72E-04, 0.585E-04, 1.19E-04*" 0.493 0.6961 27 "K=0.412, 0.407%" A REDUCED AGE 14158 1 93.62 2.5 hornblende conventional K-Ar SC41 "4.72E-04, 0.585E-04, 1.19E-04*" 0.764 1.057 37 A REDUCED AGE 14159 1 82.41 1.6 biotite conventional K-Ar 218 "4.72E-04, 0.585E-04, 1.19E-04*" 6.41 7.782 73 "K=5.28, 5.37%" A REDUCED AGE 14160 1 82.32 1.6 biotite conventional K-Ar 176 "4.72E-04, 0.585E-04, 1.19E-04*" 8.75 10.61 69 "K=7.28, 7.24%" A REDUCED AGE 14161 1 77.82 1.5 biotite conventional K-Ar 104 "4.72E-04, 0.585E-04, 1.19E-04*" 6.9 7.9 65 "K=5.83, 5.63%" A REDUCED AGE 14161 2 61.43 5.8 hornblende conventional K-Ar 104 "4.72E-04, 0.585E-04, 1.19E-04*" 0.243 0.2186 10 "K=0.195, 0.209%" A REDUCED AGE 14161 3 63.28 2 hornblende conventional K-Ar 104 "4.72E-04, 0.585E-04, 1.19E-04*" 0.243 0.2253 40 "K=0.195, 0.209%" A REDUCED AGE 14162 1 83.18 4.3 hornblende conventional K-Ar 241 "4.72E-04, 0.585E-04, 1.19E-04*" 0.648 0.7942 19 "K=0.535, 0.541%" A REDUCED AGE 14163 1 88.8 2.1 hornblende conventional K-Ar 107 "4.72E-04, 0.585E-04, 1.19E-04*" 0.555 0.7273 41 "K=0.451, 0.471%" A REDUCED AGE 14164 1 85.44 1.7 biotite conventional K-Ar DG "4.72E-04, 0.585E-04, 1.19E-04*" 4.81 6.059 57 age of intrusion "K=4.02, 3.96%" 14165 1 80.88 1.6 biotite conventional K-Ar SC10 "4.72E-04, 0.585E-04, 1.19E-04*" 8.37 9.968 78 age of intrusion "K=7.01, 6.89%" 14166 1 19.5 0.8 whole rock conventional K-Ar VHSW-3N "4.72E-04, 0.585E-04, 1.19E-04" 0.923 51 minimum age of volcanism 60-100 MESH 14166 2 22.2 1.1 plagioclase conventional K-Ar VHSW-3N "4.72E-04, 0.585E-04, 1.19E-04" 0.199 29 age of volcanism 60-100 MESH 14167 1 70.1 2.1 biotite conventional K-Ar VHSE-7N "4.72E-04, 0.585E-04, 1.19E-04" 9.36 73 age of intrusion 60-100 MESH 14168 1 25.2 1 plagioclase conventional K-Ar E-2N "4.72E-04, 0.585E-04, 1.19E-04" 0.295 44 age of volcanism 14171 1 55 2.2 K feldspar conventional K-Ar G199 "4.962E-04, 0.581E-04, 1.1167E-04" 3.15 2.532 57 maximum age of intrusion 40AR-40K ISOCHRON GAVE A DATE OF 52 M.Y. 14171 2 49.5 2 sericite conventional K-Ar G199 "4.962E-04, 0.581E-04, 1.1167E-04" 3.35 2.419 78 minimum age of intrusion 40AR-40K ISOCHRON GAVE A DATE OF 52 M.Y. 14171 3 51.7 1.9 K feldspar 40Ar-40K isochron G199 "4.962E-04, 0.581E-04, 1.1167E-04" 580 age of intrusion 4-POINT MINERAL ISOCHRON (40AR-40K ISOCHRON) 14171 4 51.7 1.9 sericite 40Ar-40K isochron G199 "4.962E-04, 0.581E-04, 1.1167E-04" 580 age of intrusion 4-POINT MINERAL ISOCHRON (40AR-40K ISOCHRON) 14172 1 52.7 2.1 K feldspar conventional K-Ar G200 "4.962E-04, 0.581E-04, 1.1167E-04" 7.21 5.546 49 age of intrusion 40AR-40K ISOCHRON GAVE A 52 M.Y. DATE 14172 2 57.2 2.3 chlorite group conventional K-Ar G200 "4.962E-04, 0.581E-04, 1.1167E-04" 0.407 0.3404 47 A QUESTIONABLE DATE; 40AR-40K ISOCHRON GAVE A 52 M.Y. DATE 14172 3 51.7 1.9 K feldspar 40Ar-40K isochron G200 "4.962E-04, 0.581E-04, 1.1167E-04" 580 age of intrusion 4-POINT MINERAL ISOCHRON (40AR-40K ISOCHRON) 14172 4 51.7 1.9 chlorite group 40Ar-40K isochron G200 "4.962E-04, 0.581E-04, 1.1167E-04" 580 age of intrusion 4-POINT MINERAL ISOCHRON (40AR-40K ISOCHRON) 14173 1 0.24 0.13 whole rock conventional K-Ar 71AHR134A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0028 5 age of volcanism 14174 1 0.36 0.06 whole rock conventional K-Ar 66AHR136B "4.962E-04, 0.581E-04, 1.1167E-04" 0.0042 16 age of volcanism 14175 1 0.65 0.18 whole rock conventional K-Ar 66AHR218A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0095 4 age of volcanism 14176 1 1.46 0.13 whole rock conventional K-Ar 66AHR217B "4.962E-04, 0.581E-04, 1.1167E-04" 0.0149 19 age of volcanism 14177 1 39.3 1 biotite conventional K-Ar 70APA47A "4.962E-04, 0.581E-04, 1.1167E-04" 7.93 4.534 61 age of volcanism 14178 1 62.1 1.8 hornblende conventional K-Ar 66APA242A "4.962E-04, 0.581E-04, 1.1167E-04" 0.8837 56 minimum age of volcanism 14178 2 64.4 1.9 sanidine conventional K-Ar 66APA242 "4.962E-04, 0.581E-04, 1.1167E-04" 5.894 92 age of volcanism 14179 1 64 2 whole rock conventional K-Ar 69ACY163B "4.962E-04, 0.581E-04, 1.1167E-04" 5.387 79 age of volcanism 14180 1 93.5 3 biotite conventional K-Ar 69APA219E "4.962E-04, 0.581E-04, 1.1167E-04" 11.02 87 age of intrusion 14181 1 104 3 biotite conventional K-Ar 70ACY162 "4.962E-04, 0.581E-04, 1.1167E-04" 8.17 12.57 87 age of intrusion 14182 1 104 3.1 hornblende conventional K-Ar 66AMM245 "4.962E-04, 0.581E-04, 1.1167E-04" 2.277 90 age of intrusion 14183 1 108 3.2 biotite conventional K-Ar 66AMM211 "4.962E-04, 0.581E-04, 1.1167E-04" 7.606 95 age of intrusion 14184 1 90.9 3 biotite conventional K-Ar 69APA187B "4.962E-04, 0.581E-04, 1.1167E-04" 8.009 76 age of volcanism 14185 1 221 7 hornblende conventional K-Ar 70APA13 "4.962E-04, 0.581E-04, 1.1167E-04" 3.055 91 minimum age of intrusion 14186 1 244 7 hornblende conventional K-Ar 69APA229A "4.962E-04, 0.581E-04, 1.1167E-04" 3.348 87 age of intrusion 14206 1 37.9 1.5 plagioclase conventional K-Ar 1845A "4.962E-04, 0.581E-04, 1.1167E-04" 4.72 2.591 82 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14206 2 59.4 8.3 biotite conventional K-Ar 1845B "4.962E-04, 0.581E-04, 1.1167E-04" 7.37 6.4013 16 THIS DATE IS PROBABLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14207 1 30.7 1.5 orthoclase conventional K-Ar 1846 "4.962E-04, 0.581E-04, 1.1167E-04" 9.37 4.1793 53 age not evaluated 14208 1 39.1 1.9 sericite conventional K-Ar 1847 "4.962E-04, 0.581E-04, 1.1167E-04" 4.71 2.6823 61 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14209 1 60.6 10.9 hornblende conventional K-Ar 1848A "4.962E-04, 0.581E-04, 1.1167E-04" 1.09 0.967 11 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14209 2 63.7 3.2 plagioclase conventional K-Ar 1848B "4.962E-04, 0.581E-04, 1.1167E-04" 1.88 1.7316 47 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14210 1 58.8 2.5 hornblende conventional K-Ar 1849 "4.962E-04, 0.581E-04, 1.1167E-04" 1.49 1.2946 30 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14211 1 56.9 1.7 biotite conventional K-Ar 1851 "4.962E-04, 0.581E-04, 1.1167E-04" 9.83 8.1656 68 THIS DATE IS POSSIBLY THE RESULT OF A GEOTHERMAL EVENT 14212 1 34.8 2.3 whole rock conventional K-Ar 1852 "4.962E-04, 0.581E-04, 1.1167E-04" 3.75 1.8935 29 minimum age of volcanism 14213 1 61.1 1.8 biotite conventional K-Ar 1853 "4.962E-04, 0.581E-04, 1.1167E-04" 4.57 4.0835 70 minimum age of metamorphic crystallization 14214 1 58.1 4.1 biotite conventional K-Ar 1854 "4.962E-04, 0.581E-04, 1.1167E-04" 8.05 6.834 25 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14215 1 62.7 1.9 sericite conventional K-Ar 1855 "4.962E-04, 0.581E-04, 1.1167E-04" 7.78 7.1426 80 minimum age of metamorphic crystallization 14216 1 62.5 2.5 biotite conventional K-Ar 1856 "4.962E-04, 0.581E-04, 1.1167E-04" 7.67 7.0247 67 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14217 1 70.6 2.8 hornblende conventional K-Ar 1857 "4.962E-04, 0.581E-04, 1.1167E-04" 0.43 0.4494 38 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14218 1 38.2 1.5 biotite conventional K-Ar 1858 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 4.9465 42 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14219 1 10.1 4.5 hornblende conventional K-Ar 1964 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.1871 3 age of intrusion 14220 1 52.4 2.6 biotite conventional K-Ar 1965 "4.962E-04, 0.581E-04, 1.1167E-04" 6.81 5.2106 32 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14221 1 21.7 2.8 hornblende conventional K-Ar 1966 "4.962E-04, 0.581E-04, 1.1167E-04" 3.47 1.0869 13 age of intrusion 14222 1 45.4 1.8 biotite conventional K-Ar 1967 "4.962E-04, 0.581E-04, 1.1167E-04" 7.34 4.859 45 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14223 1 62.3 3.4 biotite conventional K-Ar 1968 "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 8.1974 33 THIS DATE MAY BE A REDUCED DATE OR THE TIME OF INTRUSION 14224 1 51.2 2.8 hornblende conventional K-Ar 1969 "4.962E-04, 0.581E-04, 1.1167E-04" 1.31 0.9806 34 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14225 1 38.5 1.9 biotite conventional K-Ar 1970 "4.962E-04, 0.581E-04, 1.1167E-04" 4.83 2.7054 33 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14226 1 44.9 2.2 hornblende conventional K-Ar 1971 "4.962E-04, 0.581E-04, 1.1167E-04" 1.12 0.7328 35 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14227 1 62.4 4.7 muscovite conventional K-Ar 1972 "4.962E-04, 0.581E-04, 1.1167E-04" 7.73 7.0605 22 THIS DATE MAY BE A REDUCED AGE OR THE TIME OF INTRUSION 14228 1 79.3 5.6 biotite conventional K-Ar 1973A "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 9.6954 24 THIS DATE MAY BE A REDUCED DATE OR THE TIME OF INTRUSION 14228 2 25.5 1 orthoclase conventional K-Ar 1973B "4.962E-04, 0.581E-04, 1.1167E-04" 13.71 5.0612 57 age not evaluated 14229 1 54.6 4.4 biotite conventional K-Ar 1974 "4.962E-04, 0.581E-04, 1.1167E-04" 7.58 6.0405 19 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14230 1 86.6 2.6 hornblende conventional K-Ar 1975 "4.962E-04, 0.581E-04, 1.1167E-04" 0.93 1.1835 41 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14231 1 39.5 1.9 hornblende conventional K-Ar 1976 "4.962E-04, 0.581E-04, 1.1167E-04" 1.66 9.5556 38 age of intrusion 14232 1 56.2 2.8 biotite conventional K-Ar 1977 "4.962E-04, 0.581E-04, 1.1167E-04" 7.32 6.0165 51 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14233 1 54.4 2.1 biotite conventional K-Ar 1978A "4.962E-04, 0.581E-04, 1.1167E-04" 9.67 7.69 52 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14233 2 50.6 2 muscovite conventional K-Ar 1978B "4.962E-04, 0.581E-04, 1.1167E-04" 10.71 7.9085 50 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14234 1 68.3 4.1 biotite conventional K-Ar 1979 "4.962E-04, 0.581E-04, 1.1167E-04" 9.24 9.2513 31 THIS MAY BE A REDUCED AGE OR THE TIME OF INTRUSION 14235 1 68.2 3.4 biotite conventional K-Ar 1980 "4.962E-04, 0.581E-04, 1.1167E-04" 9.44 9.44 34 THIS DATE MAY BE A REDUCED DATE OR THE MINIMUM AGE FOR A METAMORPHIC EVENT 14236 1 90.1 3.6 plagioclase conventional K-Ar 1994 "4.962E-04, 0.581E-04, 1.1167E-04" 3.71 4.9307 46 age of intrusion 14237 1 59.1 2 biotite conventional K-Ar 1997 "4.962E-04, 0.581E-04, 1.1167E-04" 9.05 7.8192 38 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14238 1 107.3 3.2 biotite conventional K-Ar 1999 "4.962E-04, 0.581E-04, 1.1167E-04" 8.32 13.2426 73 minimum age of metamorphic crystallization 14239 1 42.7 1.7 biotite conventional K-Ar 2000A "4.962E-04, 0.581E-04, 1.1167E-04" 3.72 2.3144 36 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14239 2 64.8 3.9 hornblende conventional K-Ar 2000B "4.962E-04, 0.581E-04, 1.1167E-04" 0.4 0.3777 30 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14240 1 67.7 3.4 biotite conventional K-Ar 2034 "4.962E-04, 0.581E-04, 1.1167E-04" 7.52 7.46 37 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14241 1 55.2 7.8 biotite conventional K-Ar 2035 "4.962E-04, 0.581E-04, 1.1167E-04" 7.77 6.271 15 THIS DATE MAY BE A REDUCED DATE OR THE TIME OF INTRUSION 14242 1 76.8 5 hornblende conventional K-Ar 2036 "4.962E-04, 0.581E-04, 1.1167E-04" 1.12 1.2654 27 PROBABLY A REDUCED AGE 14243 1 80.5 5.2 biotite conventional K-Ar 2037 "4.962E-04, 0.581E-04, 1.1167E-04" 8.26 9.7892 28 THIS DATE COULD BE A REDUCED DATE OR THE TIME OF INTRUSION 14244 1 60.4 2.1 biotite conventional K-Ar 2038 "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 7.126 77 THIS DATE MAY BE A REDUCED DATE OR THE TIME OF INTRUSION 14245 1 59.1 8.9 whole rock conventional K-Ar 2061 "4.962E-04, 0.581E-04, 1.1167E-04" 2.84 2.4575 11 THIS DATE MAY BE A REDUCED DATE CAUSED BY THE THERMAL REGIME ASSOCIATED WITH THE FAULTING 14246 1 42.9 1.3 biotite conventional K-Ar 2062 "4.962E-04, 0.581E-04, 1.1167E-04" 5.83 3.6449 43 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14247 1 43.3 2.8 biotite conventional K-Ar 2072 "4.962E-04, 0.581E-04, 1.1167E-04" 6.16 3.8852 27 THIS DATE IS POSSIBLY THE RESULT OF A THERMAL REGIME ASSOCIATED WITH THRUST FAULTING 14248 1 52.5 1.6 biotite conventional K-Ar 2081 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 6.6307 71 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14249 1 67.1 2 biotite conventional K-Ar 2083 "4.962E-04, 0.581E-04, 1.1167E-04" 9.34 9.1841 69 age of intrusion 14250 1 115.9 9.3 hornblende conventional K-Ar 2084 "4.962E-04, 0.581E-04, 1.1167E-04" 0.65 1.1102 19 age of metamorphic crystallization 14251 1 23.5 1 whole rock conventional K-Ar 2103 "4.962E-04, 0.581E-04, 1.1167E-04" 8.47 2.8813 53 minimum age of volcanism 14252 1 433.9 15.2 biotite conventional K-Ar 2107 "4.962E-04, 0.581E-04, 1.1167E-04" 6.2 43.7906 89 DATE MAY BE RESULT OF GEOTHERMAL REGIME ACCOMPANYING FAULTING 14253 1 298.6 11.9 hornblende conventional K-Ar 2108 "4.962E-04, 0.581E-04, 1.1167E-04" 0.55 2.6171 37 THIS DATE MAY BE THE RESULT OF A GEOTHERMAL EVENT ACCOMPANYING THE FAULTING 14254 1 36.8 3.7 whole rock conventional K-Ar 2104 "4.962E-04, 0.581E-04, 1.1167E-04" 1.59 0.855 17 THIS DATE MAY INDICATE THE TIME OF FAULTING 14255 1 38.5 1.3 whole rock conventional K-Ar 2105 "4.962E-04, 0.581E-04, 1.1167E-04" 3.28 1.8336 39 age not evaluated 14256 1 122.4 17.1 hornblende conventional K-Ar 2106 "4.962E-04, 0.581E-04, 1.1167E-04" 0.61 1.1112 12 minimum age of metamorphic crystallization 14257 1 135.2 6.8 biotite conventional K-Ar 2135 "4.962E-04, 0.581E-04, 1.1167E-04" 7.77 15.7025 36 THIS DATE MAY BE A REDUCED AGE CAUSED BY THE THERMAL REGIME ASSOCIATED WITH THE FAULTING 14258 1 59.8 2 muscovite conventional K-Ar 2137 "4.962E-04, 0.581E-04, 1.1167E-04" 4 3.502 70 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14259 1 71 11 hornblende conventional K-Ar 2223 "4.962E-04, 0.581E-04, 1.1167E-04" 0.61 1.8819 11 THIS DATE MAY BE A REDUCED DATE OR THE TIME OF INTRUSION 14260 1 55.8 2 biotite conventional K-Ar 2224 "4.962E-04, 0.581E-04, 1.1167E-04" 9.31 7.59 39 THIS DATE MAY BE A REDUCED DATE OR THE TIME OF INTRUSION 14261 1 56.5 2.5 biotite conventional K-Ar 2225 "4.962E-04, 0.581E-04, 1.1167E-04" 9.82 8.1057 36 THIS DATE IS POSSIBLY THE RESULT OF A TERTIARY GEOTHERMAL EVENT 14262 1 159 6 biotite conventional K-Ar 1205 "4.962E-04, 0.581E-04, 1.1167E-04" 7.67 17.3204 51 age of intrusion 14310 1 32.8 1 whole rock conventional K-Ar 881-4-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 72 age of intrusion 14310 2 30.4 0.9 plagioclase conventional K-Ar 881-4-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.609 0.697 72 minimum age of intrusion 14311 1 31 1.5 hornblende conventional K-Ar 881-4-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.485 0.216 18 age of intrusion 14312 1 8.3 0.4 whole rock conventional K-Ar 781-31-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.744 0.0285 24 age meaning uncertain (analysis questionable) "THE POTASSIUM AND ARGON VALUES CALCULATE A DATE OF 2.7 M.Y., NOT 8.3 M.Y.--COMPILER)" 14313 1 12.7 0.7 whole rock conventional K-Ar 881-7-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2587 53 minimum age of intrusion 14315 1 74.3 2.7 biotite conventional K-Ar 2. USGS(D)-M547-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.18 88 minimum age of intrusion 14315 2 71.9 4.3 hornblende conventional K-Ar 2. USGS(D)-M547-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9618 82 THIS DATE SEEMS SLIGHTLY YOUNG 14316 1 70.5 1.7 biotite conventional K-Ar 4. USGS(D)-FG "4.962E-04, 0.581E-04, 1.1167E-04" 9.491 93 minimum age of intrusion 14316 2 70.6 3.2 hornblende conventional K-Ar 4. USGS(D)-FG "4.962E-04, 0.581E-04, 1.1167E-04" 0.5186 58 minimum age of intrusion 14317 1 71.3 2.4 biotite conventional K-Ar 5. USGS(D)-M121-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.196 96 minimum age of intrusion 14317 2 71.3 4.5 hornblende conventional K-Ar 5. USGS(D)-M121-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7382 65 minimum age of intrusion 14318 1 72 2.5 biotite conventional K-Ar 6. USGS(D)-M881-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.687 94 minimum age of intrusion 14319 1 72.2 2.6 biotite conventional K-Ar 7. USGS(D)-M1272-2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.683 92 minimum age of intrusion 14319 2 68.8 4.2 hornblende conventional K-Ar 7. USGS(D)-M1272-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8834 79 THIS DATE SEEMS SLIGHTLY YOUNG 14320 1 74.1 2.7 biotite conventional K-Ar 11. USGS(D)M1293-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.777 88 minimum age of intrusion 14321 1 71.3 2.4 biotite conventional K-Ar 12. USGS(D)-M744-2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.4 91 minimum age of intrusion 14322 1 71.7 2.6 biotite conventional K-Ar 13. USGS(D)-M1228-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.258 93 minimum age of intrusion 14323 1 72.3 2.6 biotite conventional K-Ar 14. USGS(D)-M1162-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.77 88 minimum age of intrusion 14324 1 66.8 2.4 biotite conventional K-Ar 15. USGS(D)-M516-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.946 78 age of intrusion 14325 1 64.6 2.1 biotite conventional K-Ar 16. USGS(D)-M500-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.038 91 age of intrusion 14326 1 64.9 2.2 biotite conventional K-Ar 17. USGS(D)-M32-1-4 "4.962E-04, 0.581E-04, 1.1167E-04" 7.877 88 age of intrusion 14327 1 64.4 2.2 whole rock conventional K-Ar 18. USGS(D)-M741-2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.724 87 minimum age of intrusion 14328 1 77.1 2.8 biotite conventional K-Ar 19. USGS(D)-M984-2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.548 88 minimum age of intrusion 14329 1 76.4 2.6 biotite conventional K-Ar 20. USGS(D)-DODGSON CREEK "4.962E-04, 0.581E-04, 1.1167E-04" 10.46 94 minimum age of intrusion 14329 2 95.9 2.8 hornblende conventional K-Ar 20. USGS(D)-DODGSON CREEK "4.962E-04, 0.581E-04, 1.1167E-04" 0.653 0.9258 94 POTASSIUM DETERMINED BY ISOTOPE DILUTION SPURIOUS DATE; TOO OLD 14329 3 98.8 2.8 hornblende conventional K-Ar 20. USGS(D)-DODGSON CREEK "4.962E-04, 0.581E-04, 1.1167E-04" 0.653 0.9547 84 POTASSIUM DETERMINED BY ISOTOPE DILUTION SPURIOUS DATE; TOO OLD 14330 1 47.8 1.7 whole rock conventional K-Ar V1. USGS(D)-M913-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.176 82 minimum age of volcanism 14331 1 47.6 1.7 whole rock conventional K-Ar V2. USGS(D)-M914-2 "4.962E-04, 0.581E-04, 1.1167E-04" 2.202 90 minimum age of volcanism 14332 1 48.8 1.8 whole rock conventional K-Ar V3. USGS(D)-M41-3-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8652 58 age of volcanism 14333 1 22.7 0.7 biotite conventional K-Ar GGN-S1 "4.72E-04, 0.585E-04, 1.19E-04" 2.9648 62 PLUTON FORMED 25-26 M.Y. AGO 14333 2 24.1 0.7 muscovite conventional K-Ar GGN-S1 "4.72E-04, 0.585E-04, 1.19E-04" 3.5017 75 PLUTON FORMED 25-26 M.Y. AGO 14334 1 24 0.7 biotite conventional K-Ar ML-61 "4.72E-04, 0.585E-04, 1.19E-04" 3.0743 79 PLUTON FORMED 25-26 M.Y. AGO 14334 2 22.3 0.7 hornblende conventional K-Ar ML-61 "4.72E-04, 0.585E-04, 1.19E-04" 0.3073 39 PLUTON FORMED 25-26 M.Y. AGO 14335 1 23.5 0.7 biotite conventional K-Ar ML-60 "4.72E-04, 0.585E-04, 1.19E-04" 3.184 78 PLUTON FORMED 25-26 M.Y. AGO 14335 2 36.8 1 hornblende conventional K-Ar ML-60 "4.72E-04, 0.585E-04, 1.19E-04" 0.579 53 SPURIOUS AGE; TOO OLD 14336 1 23.1 0.7 biotite conventional K-Ar BR-21 "4.72E-04, 0.585E-04, 1.19E-04" 2.5062 64 PLUTON FORMED 25-26 M.Y. AGO 14336 2 23.4 1.2 hornblende conventional K-Ar BR-21 "4.72E-04, 0.585E-04, 1.19E-04" 0.2079 20 PLUTON FORMED 25-26 M.Y. AGO 14337 1 23.2 0.7 biotite conventional K-Ar BR-16 "4.72E-04, 0.585E-04, 1.19E-04" 3.1314 67 PLUTON FORMED 25-26 M.Y. AGO 14338 1 20.6 0.6 biotite conventional K-Ar RC3-1 "4.72E-04, 0.585E-04, 1.19E-04" 2.6417 53 age of intrusion 14338 2 21.1 0.6 hornblende conventional K-Ar RC3-1 "4.72E-04, 0.585E-04, 1.19E-04" 0.2925 50 age of intrusion 14339 1 22.1 0.7 biotite conventional K-Ar RC-25 "4.72E-04, 0.585E-04, 1.19E-04" 2.7432 69 age of intrusion 14361 1 35.8 0.3 whole rock conventional K-Ar 336-77A "4.962E-04, 0.581E-04, 1.1167E-04" 0.1704 27 60-100 MESH FRACTION DATE TOO YOUNG; FORMATION FORMED FROM 40-45 M.Y. AGO 14361 2 31.9 0.4 whole rock conventional K-Ar 336-77B "4.962E-04, 0.581E-04, 1.1167E-04" 0.1444 12 100-200 MESH FRACTION DATE TOO YOUNG; FORMATION FORMED FROM 40-45 M.Y. AGO 14361 3 40.5 0.3 whole rock conventional K-Ar 336-77C "4.962E-04, 0.581E-04, 1.1167E-04" 0.195 3050 "60-100 MESH FRACTION, TREATED WITH HF, THEN NITRIC ACID" "40AR-RAD=1.956, 1.943XE-11 MOL/G" DATE PROBABLY YOUNG; FORMATION FORMED FROM 40-45 M.Y. AGO 14361 4 29.2 6.5 whole rock conventional K-Ar 336-77D "4.962E-04, 0.581E-04, 1.1167E-04" 0.1319 6 GROUND TO LESS THAN 60 MESH DATE TOO YOUNG; FORMATION FORMED FROM 40-45 M.Y. AGO 14362 1 43.2 3.1 whole rock conventional K-Ar 209-77A "4.962E-04, 0.581E-04, 1.1167E-04" 0.4882 13 age of volcanism 60-100 MESH FRACTION FORMATION PROBABLY FORMED FROM 40-45 M.Y. AGO 14362 2 40.8 2.7 whole rock conventional K-Ar 209-77B "4.962E-04, 0.581E-04, 1.1167E-04" 0.457 17 100-200 MESH FRACTION FORMATION PROBABLY FORMED FROM 40-45 M.Y. AGO; THIS DATE MAY BE SLIGHTLY YOUNG 14362 3 37.6 2.6 whole rock conventional K-Ar 209-77BCL "4.962E-04, 0.581E-04, 1.1167E-04" 0.4123 1424 100-200 MESH FRACTION CLEANED BY ULTRASONIC "40AR-RAD=3.835, 4.411XE-11 MOL/G" DATE TOO YOUNG; FORMATION PROBABLY FORMED FROM 40-45 M.Y. AGO 14362 4 39 0.8 whole rock conventional K-Ar 209-77C "4.962E-04, 0.581E-04, 1.1167E-04" 0.4629 21 "60-100 MESH FRACTION TREATED WITH HF, THEN NITRIC ACID" DATE IS APPARENTLY TOO YOUNG; FORMATION PROBABLY FORMED 40-45 M.Y. AGO 14362 5 33.8 1.8 whole rock conventional K-Ar 209-77D "4.962E-04, 0.581E-04, 1.1167E-04" 0.2845 1925 GROUND TO LESS THAN 60 MESH "40AR-RAD=3.220, 3.349XE-11 MOL/G" DATE TOO YOUNG; FORMATION PROBABLY FORMED FROM 40-45 M.Y. AGO 14363 1 37.7 0.4 whole rock conventional K-Ar 209-77DCL "4.962E-04, 0.581E-04, 1.1167E-04" 0.4104 32 "GROUND TO LESS THAN 60 MESH, THEN CLEANED BY ULTRASONIC" DATE APPARENTLY TOO YOUNG; FORMATION PROBABLY FORMED FROM 40-45 M.Y. AGO 14364 1 47.4 4.6 whole rock conventional K-Ar 250-77A "4.962E-04, 0.581E-04, 1.1167E-04" 0.1721 3225 minimum age of volcanism 60-100 MESH FRACTION "40AR-RAD=1.701, 1.741XE-11 MOL/G" 14364 2 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 250-77A "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism 60-100 MESH FRACTION "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14364 3 34.5 1.3 whole rock conventional K-Ar 250-77B "4.962E-04, 0.581E-04, 1.1167E-04" 0.1225 22 100-200 MESH FRACTION DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. OLD 14364 4 38.7 5.1 whole rock conventional K-Ar 250-77C "4.962E-04, 0.581E-04, 1.1167E-04" 0.1395 26 "60-100 MESH FRACTION TREATED WITH HF, THEN NITRIC ACID" DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. OLD 14364 5 33.2 3.5 whole rock conventional K-Ar 250-77D "4.962E-04, 0.581E-04, 1.1167E-04" 0.1121 14 GROUND TO LESS THAN 60 MESH DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. OLD. 14365 1 37 0.6 whole rock conventional K-Ar 250-77F "4.962E-04, 0.581E-04, 1.1167E-04" 0.1231 16 "GROUND TO LESS THAN 60 MESH, THEN MATERIAL OF SP. GR. 2.63+ FLOATED OFF" DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. AGO 14366 1 41 1.5 whole rock conventional K-Ar 400-76A "4.962E-04, 0.581E-04, 1.1167E-04" 0.5241 6640 60-100 MESH FRACTION "40AR-RAD=5.028, 5.454XE-11 MOL/G" DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. OLD 14366 2 46.9 0.7 whole rock conventional K-Ar 400-76B "4.962E-04, 0.581E-04, 1.1167E-04" 0.6299 68 minimum age of volcanism 100-200 MESH FRACTION 14366 3 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 400-76B "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism 100-200 MESH FRACTION "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14366 4 46.4 0.5 whole rock conventional K-Ar 400-76C "4.962E-04, 0.581E-04, 1.1167E-04" 0.601 44 minimum age of volcanism "60-100 MESH FRACTION TREATED WITH HF, THEN NITRIC ACID" 14366 5 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 400-76C "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism "60-100 MESH FRACTION TREATED WITH HF, THEN NITRIC ACID" "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14367 1 40.2 0.4 whole rock conventional K-Ar 400-76D "4.962E-04, 0.581E-04, 1.1167E-04" 0.5131 49 GROUND TO LESS THAN 60 MESH DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. OLD 14368 1 39.7 0.8 whole rock conventional K-Ar 140-75A "4.962E-04, 0.581E-04, 1.1167E-04" 0.661 72 40-100 MESH FRACTION DATE TOO YOUNG; BASALT IS PROBABLY 47-48 M.Y. OLD 14368 2 46.7 1.1 whole rock conventional K-Ar 140-75B "4.962E-04, 0.581E-04, 1.1167E-04" 0.7785 51 minimum age of volcanism 100-200 MESH FRACTION 14368 3 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 140-75B "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism 100-200 MESH FRACTION "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14368 4 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 140-75C "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism "60-100 MESH FRACTION TREATED WITH HF, THEN NITRIC ACID" "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14368 5 44.9 1.3 whole rock conventional K-Ar 140-75C "4.962E-04, 0.581E-04, 1.1167E-04" 0.8374 81 minimum age of volcanism "60-100 MESH FRACTION TREATED WITH HF, THEN NITRIC ACID" 14369 1 46.9 0.6 whole rock conventional K-Ar 143-78A "4.962E-04, 0.581E-04, 1.1167E-04" 0.7413 62 minimum age of volcanism 60-100 MESH FRACTION 14369 2 48.3 1.8 whole rock conventional K-Ar 143-78B "4.962E-04, 0.581E-04, 1.1167E-04" 0.7282 7679 age of volcanism 100-200 MESH FRACTION "40AR-RAD=7.545, 7.0199XE-11 MOL/GM" 14369 3 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 143-78A "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism 60-100 MESH FRACTION "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14369 4 47.4 0.7 whole rock 40Ar/36Ar-40K/36Ar isochron 143-78B "4.962E-04, 0.581E-04, 1.1167E-04" 593 age of volcanism 100-200 MESH FRACTION "7-POINT WHOLE-ROCK ""40AR-36AR VERSUS 40K-36AR"" ISOCHRON" 14397 1 5.9 Unk conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14398 1 5.78 0.08 glass conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14399 1 0.76 0.2 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14400 1 1550 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 14402 1 27.1 0.9 sanidine conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 3.212 85 age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14403 1 33.7 0.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 4.001 79 age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14404 1 16 0.3 glass conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14405 1 8.1 1.3 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0269 30 minimum age of intrusion ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14406 1 13.9 0.5 sanidine conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.113 87 age of volcanism NORMAL MAGNETISM ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14407 1 15.7 0.5 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.3571 63 minimum age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14408 1 30.6 1 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.7591 85 age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14409 1 25 1 sanidine conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14410 1 23.2 0.8 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14410 2 21.6 0.6 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism NO ANALYTICAL DATA GIVEN 14411 1 157.4 4.7 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN MAY ALSO BE A HYBRID DATE 14412 1 172 4.3 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 14413 1 58.8 2 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 6.179 90 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN, K-AR DATE ALSO LISTED AS 58.5 M.Y." 14414 1 33.7 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14417 1 56.5 1.2 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 14420 1 142 6 hornblende conventional K-Ar LCE-6 no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; DIORITE IS PROBABLY 162-163 M.Y. OLD 14420 2 142 3.4 hornblende conventional K-Ar LCE-6 no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; DIORITE IS PROBABLY 162-163 M.Y. OLD 14421 1 38.1 6.4 hornblende conventional K-Ar LC-9C no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; DIORITE IS PROBABLY 162-163 M.Y. OLD 14421 2 42.1 3.4 hornblende conventional K-Ar LC-9C no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; DIORITE IS PROBABLY 162-163 M.Y. OLD 14422 1 120 3 whole rock conventional K-Ar 13 no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; ROCK IS PROBABLY OLDER THAN 170 M.Y. 14422 2 123 3 whole rock conventional K-Ar 13 no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; ROCK IS PROBABLY OLDER THAN 170 M.Y. 14423 1 135 6 hornblende conventional K-Ar HC-3B no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; ROCK IS PROBABLY OLDER THAN 170 M.Y. 14424 1 66.7 11.9 whole rock conventional K-Ar EF-4 no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; KERATOPHYRE IS PROBABLY OLDER THAN 170 M.Y. 14424 2 55.8 11.3 whole rock conventional K-Ar EF-4 no decay constants given NO ANALYTICAL DATA GIVEN A REDUCED DATE; KERATOPHYRE IS PROBABLY OLDER THAN 170 M.Y. 14427 1 131.37 3.2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 9.8 19.226 84 age of intrusion 14427 2 131.13 3.2 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 0.407 0.797 48 age of intrusion 14428 1 2.41 0.12 whole rock conventional K-Ar CR5-77 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0125 4 age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14429 1 1.08 0.16 whole rock conventional K-Ar PSW-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0065 2 age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14430 1 48.9 2.1 hornblende conventional K-Ar 5212 (D2523H) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5664 72 age of intrusion ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14431 1 48.5 2 biotite conventional K-Ar 724 (D2520B) "4.962E-04, 0.581E-04, 1.1167E-04" 6.223 81 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN (DATED MATERIAL IS PROBABLY BIOTITE, NOT HORNBLENDE, AS LISTED--COMPILER)" RB-SR AGE OF 48.6+/-1.0 M.Y. ALSO LISTED 14432 1 53.9 1.3 hornblende conventional K-Ar 4356 (D2522H) "4.962E-04, 0.581E-04, 1.1167E-04" 0.9087 83 age of intrusion ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14433 1 67.6 1.6 hornblende conventional K-Ar 4309 (D2521H) "4.962E-04, 0.581E-04, 1.1167E-04" 1.085 88 age of intrusion ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14434 1 99.4 3.4 hornblende conventional K-Ar 1. (W-20-3) "4.962E-04, 0.581E-04, 1.1167E-04" 2.059 85 age of intrusion 14435 1 49.7 1.7 biotite conventional K-Ar 2. (LP-4) "4.962E-04, 0.581E-04, 1.1167E-04" 5.818 86 age of intrusion 14435 2 40 1.4 K feldspar conventional K-Ar 2. (LP-4) "4.962E-04, 0.581E-04, 1.1167E-04" 3.714 79 A REDUCED AGE; ISOTOPIC SYSTEM MAY HAVE BEEN EFFECTED BY THERMAL EVENT ASSOCIATED WITH MINERALIZATION 14436 1 38.6 1.1 biotite conventional K-Ar 3. (LP-2) "4.962E-04, 0.581E-04, 1.1167E-04" 6.406 3.655 81 POTASSIUM CONTENT DETERMINED BY ISOTOPE DILUTION--K. FUTA MAY BE THE TIME OF MINERALIZATION 14437 1 106 3 muscovite conventional K-Ar 4. (W-36-1) "4.962E-04, 0.581E-04, 1.1167E-04" 17.24 86 age of intrusion 14438 1 107 4 biotite conventional K-Ar 5. (W-36-2) "4.962E-04, 0.581E-04, 1.1167E-04" 14.52 94 age of intrusion 14439 1 171 14 hornblende conventional K-Ar 6. (W-36-3) "4.962E-04, 0.581E-04, 1.1167E-04" 0.6862 78 A SPURIOUS DATE; EXCESS RADIOGENIC ARGON PROBABLY PRESENT 14440 1 46.8 1.7 biotite conventional K-Ar 18. (W-36-4) "4.962E-04, 0.581E-04, 1.1167E-04" 6.06 87 age of intrusion 14441 1 46.3 1.7 biotite conventional K-Ar 19. (W-98-5) "4.962E-04, 0.581E-04, 1.1167E-04" 5.076 82 age of intrusion 14442 1 35.5 0.8 biotite conventional K-Ar 26. (W-11-4) "4.962E-04, 0.581E-04, 1.1167E-04" 8.19 4.226 85 age of volcanism 14442 2 36 0.8 biotite conventional K-Ar 26. (W-11-4) "4.962E-04, 0.581E-04, 1.1167E-04" 8.19 4.292 83 age of volcanism 14443 1 31.3 0.6 biotite conventional K-Ar 28. (AD-1) "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 3.778 85 age of volcanism 14444 1 34.9 0.6 biotite conventional K-Ar 29. (AD-2) "4.962E-04, 0.581E-04, 1.1167E-04" 7.42 3.764 73 age of volcanism 14445 1 803 16 hornblende conventional K-Ar 30. (AD-4) "4.962E-04, 0.581E-04, 1.1167E-04" 0.392 5.698 98 AN APPROXIMATE AGE OF EMPLACEMENT 14446 1 775 16 margarite conventional K-Ar 31. (AD-3) "4.962E-04, 0.581E-04, 1.1167E-04" 0.507 7.06 96 APPROXIMATE TIME OF CONTACT METAMORPHISM 14447 1 854 20 hornblende conventional K-Ar 32. (W-59-15) "4.962E-04, 0.581E-04, 1.1167E-04" 0.396 6.23 92 APPROXIMATE TIME OF INTRUSION 14451 1 15.8 0.5 hornblende conventional K-Ar M76-15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2199 39 minimum age of intrusion 14451 2 17.4 0.5 biotite conventional K-Ar M76-15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 2.2092 64 age of intrusion 14452 1 123.6 4 hornblende conventional K-Ar 76T30 "4.962E-04, 0.581E-04, 1.1167E-04" 0.631 1.1621 54 MAY BE A PRIMARY DATE OR A SPURIOUS DATE 14452 2 71.3 2 biotite conventional K-Ar 76T30 "4.962E-04, 0.581E-04, 1.1167E-04" 7.6858 65 MAY BE A REDUCED DATE OR A PRIMARY DATE 14453 1 66.8 2 biotite conventional K-Ar 77T40 "4.962E-04, 0.581E-04, 1.1167E-04" 9 2.0383 72 MAY BE THE TIME OF FORMATION OF THE SECONDARY BIOTITE 14454 1 3.96 0.16 plagioclase conventional K-Ar 22. (KA2310) "4.72E-04, 0.585E-04, 1.19E-04" 0.8704 25 age of volcanism 24-48 MESH FRACTION (COARSE-GRAINED) K=0.7225%; NO ARGON VALUE GIVEN 14455 1 4 1 plagioclase conventional K-Ar 30. (KA2319) "4.72E-04, 0.585E-04, 1.19E-04" 0.73 4 age of volcanism 60-120 MESH FRACTION K=0.6060%; NO ARGON VALUE GIVEN 14456 1 4.46 0.45 plagioclase conventional K-Ar 31. (KA2323) "4.72E-04, 0.585E-04, 1.19E-04" 0.7264 10 age of volcanism 60-120 MESH FRACTION K=0.6030%; NO ARGON VALUE GIVEN 14457 1 5.68 0.68 plagioclase conventional K-Ar 37. (KA2321) "4.72E-04, 0.585E-04, 1.19E-04" 0.9206 8 age of volcanism 24-48 MESH FRACTION (COARSE-GRAINED) K=0.7642%; NO ARGON VALUE GIVEN 14458 1 6 0.1 Unk conventional K-Ar 38-40 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14459 1 8.18 2 Unk conventional K-Ar 44 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14460 1 5.36 0.16 Unk conventional K-Ar "50, 51" "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14461 1 3.79 0.08 Unk conventional K-Ar 45-49 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14462 1 9.5 0.2 plagioclase conventional K-Ar TM-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0616 15 minimum age of volcanism 14462 2 10.4 0.2 whole rock conventional K-Ar TM-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4372 76 age of volcanism 14463 1 10.1 0.5 plagioclase conventional K-Ar MLC-52 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0706 11 age of volcanism 14463 2 10.1 0.2 whole rock conventional K-Ar MLC-52 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4196 66 age of volcanism 14464 1 11.3 0.2 plagioclase conventional K-Ar A-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1458 54 age of volcanism 14464 2 10.9 0.2 biotite conventional K-Ar A-7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.215 24 age of volcanism 14465 1 3.2 0.06 whole rock conventional K-Ar SNV-41 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2123 42 age of volcanism 14466 1 3.76 0.08 whole rock conventional K-Ar SNV-54 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1218 75 MINIMUM AGE OF DACITE PEBBLE 14467 1 4.03 0.12 biotite conventional K-Ar SNV-51 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4854 12 AGE OF DACITE PEBBLE 14468 1 4.5 0.4 hornblende conventional K-Ar 69-M-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.0838 14 age of volcanism 14468 2 4.4 0.4 biotite conventional K-Ar 69-M-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3351 13 age of volcanism 14469 1 3.4 0.06 whole rock conventional K-Ar KA-2755 "4.962E-04, 0.581E-04, 1.1167E-04" 2.14 0.1048 35 minimum age of volcanism 14470 1 11.7 0.1 sanidine conventional K-Ar KA-2916 "4.962E-04, 0.581E-04, 1.1167E-04" 8.125 1.658 98 age of volcanism 14471 1 4.42 0.44 whole rock conventional K-Ar 1. CH82-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.661 0.0421 11 age of volcanism 14472 1 0.36 0.13 whole rock conventional K-Ar 2. H-9-29 "4.962E-04, 0.581E-04, 1.1167E-04" 0.545 0.0029 3 age of volcanism 14473 1 0.76 0.38 whole rock conventional K-Ar 3. CH82-38 "4.962E-04, 0.581E-04, 1.1167E-04" 0.979 0.0107 1 age of volcanism 14474 1 9.16 0.88 whole rock conventional K-Ar 4. CH82-48 "4.962E-04, 0.581E-04, 1.1167E-04" 0.348 0.0459 15 age of volcanism 14475 1 9.37 0.74 whole rock conventional K-Ar 5. CH82-49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.558 0.0755 18 age of volcanism 14476 1 7.08 0.55 whole rock conventional K-Ar 6. CH82-50 "4.962E-04, 0.581E-04, 1.1167E-04" 0.394 0.0402 24 age of volcanism 14477 1 7.38 0.59 whole rock conventional K-Ar 7. CH82-52A "4.962E-04, 0.581E-04, 1.1167E-04" 0.399 0.0425 22 age of volcanism 14478 1 7.36 0.58 whole rock conventional K-Ar 8. CH82-52B "4.962E-04, 0.581E-04, 1.1167E-04" 0.402 0.0426 22 age of volcanism 14479 1 8.67 0.42 whole rock conventional K-Ar 9. H-9-52 "4.962E-04, 0.581E-04, 1.1167E-04" 1.23 0.1538 42 age of volcanism 14480 1 7.41 0.39 whole rock conventional K-Ar 10. H-9-56B "4.962E-04, 0.581E-04, 1.1167E-04" 0.711 0.076 54 age of volcanism 14481 1 3.2 0.16 whole rock conventional K-Ar 15. KT-80-57 "4.962E-04, 0.581E-04, 1.1167E-04" 2.4 0.1108 60 age of volcanism 14482 1 0.48 0.06 whole rock conventional K-Ar 16. 82-18 "4.962E-04, 0.581E-04, 1.1167E-04" 4.84 0.0332 8 age of volcanism 14483 1 0.1 0.01 whole rock conventional K-Ar 17. 82-19 "4.962E-04, 0.581E-04, 1.1167E-04" 3.74 0.0052 13 age of volcanism 14484 1 0.05 0.01 whole rock conventional K-Ar 18. 82-ANHY "4.962E-04, 0.581E-04, 1.1167E-04" 4.46 0.0031 5 age of volcanism 14490 1 4.7 0.4 sanidine conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14491 1 13 1.2 Unk conventional K-Ar (NOT GIVEN) no decay constants given minimum age of volcanism NO ANALYTICAL DATA GIVEN 14492 1 14.5 0.8 whole rock conventional K-Ar (NOT GIVEN) no decay constants given minimum age of volcanism NO ANALYTICAL DATA GIVEN 14493 1 15.5 0.7 Unk conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 14494 1 19.4 0.9 Unk conventional K-Ar (NOT GIVEN) no decay constants given minimum age of intrusion NO ANALYTICAL DATA GIVEN 14495 1 152 8 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 14496 1 76.2 1.3 hornblende conventional K-Ar 72AB74 "4.962E-04, 0.581E-04, 1.1167E-04" 0.548 0.6125 41 age of intrusion 14497 1 72.3 1.6 hornblende conventional K-Ar GB-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.528 0.5595 29 age of intrusion 14498 1 69.8 0.9 hornblende conventional K-Ar 83AB75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.516 0.5273 22 age of intrusion 14499 1 76.2 2.6 hornblende conventional K-Ar 74AB75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.495 0.5522 29 minimum age of volcanism PROBABLY A REDUCED AGE 14500 1 81.7 1.8 hornblende conventional K-Ar 54AB75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.494 0.5931 33 age of intrusion 14501 1 62.8 1.1 biotite conventional K-Ar CS-1-75 "4.962E-04, 0.581E-04, 1.1167E-04" 3.74 3.4441 64 BIOTITE IS CHLORITIZED MAY APPROXIMATE THE TIME OF MINERALIZATION 14502 1 62.5 1 muscovite conventional K-Ar D148-337 "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 9.5676 86 DATE MAY APPROXIMATE THE TIME OF MINERALIZATION 14503 1 25.5 0.2 whole rock conventional K-Ar AB49-73 "4.962E-04, 0.581E-04, 1.1167E-04" 1.78 0.6587 77 minimum age of intrusion 14504 1 634 11 muscovite 39Ar-40Ar incremental (plateau) SAMPLE 1 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR 40-39AR ANALYTICAL DATA THE TIME OF FORMATION OF THE GREISEN AND PROBABLY GRANITE EMPLACEMENT 14505 1 637 11 muscovite 39Ar-40Ar incremental (plateau) SAMPLE 2 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR 40-39AR ANALYTICAL DATA THE TIME OF FORMATION OF THE GREISEN AND PROBABLE GRANITE EMPLACEMENT 14506 1 32 0.7 hornblende conventional K-Ar SL2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.1752 5.466 6349 age of intrusion "K=0.973, 0.978%; 40AR-RAD=1.22, 1.23XE-6 CC/GM" 14507 1 32.3 0.7 K feldspar conventional K-Ar MGF-038 "4.962E-04, 0.581E-04, 1.1167E-04" 6.53 30.68 94 age of intrusion "K=5.42, 5.42, 5.43%; 40AR-RAD=7.01, 6.74XE-6 CC/GM" 14508 1 32.5 3.1 hornblende conventional K-Ar CHIN 431 "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 6.135 1719 age of volcanism "K=1.08, 1.08%; 40AR-RAD=1.28, 1.47XE-6 CC/GM" 14523 1 19.9 0.4 sanidine conventional K-Ar A (KA1168) "4.72E-04, 0.585E-04, 1.19E-04" 10.72 77 age of volcanism "K=8.90%, 40AR/40K=0.001170" 14524 1 25.7 0.5 biotite conventional K-Ar B (KA975) "4.72E-04, 0.585E-04, 1.19E-04" 6.84 86 age of volcanism "K=5.68%, 40AR/40K=0.001513" 14525 1 8.8 0.2 biotite conventional K-Ar C (KA961) "4.72E-04, 0.585E-04, 1.19E-04" 7.52 78 age of volcanism "K=6.24%, 40AR/40K=0.000518" 14526 1 8.9 0.2 biotite conventional K-Ar D (KA976) "4.72E-04, 0.585E-04, 1.19E-04" 7.9 80 age of volcanism "K=6.56%, 40AR/40K=0.000524" 14527 1 9 0.2 biotite conventional K-Ar E (KA977) "4.72E-04, 0.585E-04, 1.19E-04" 7.79 68 age of volcanism "K=6.47%, 40AR/40K=0.000527" 14528 1 3.5 0.1 whole rock conventional K-Ar F (KA1014) "4.72E-04, 0.585E-04, 1.19E-04" 1.24 27 age of volcanism "K=1.03%, 40AR/40K=0.000203" 14529 1 9.6 0.2 whole rock conventional K-Ar G (KA996) "4.72E-04, 0.585E-04, 1.19E-04" 2.19 74 age of volcanism K=1.82%; 40AR/40K=0.000561 14530 1 9.5 0.3 whole rock conventional K-Ar H (KA998) "4.72E-04, 0.585E-04, 1.19E-04" 2.42 28 age of volcanism "K=2.01%, 40AR/40K=0.000558" 14531 1 3.6 0.1 whole rock conventional K-Ar J (KA988) "4.72E-04, 0.585E-04, 1.19E-04" 1.94 84 age of volcanism "K=1.61%, 40AR/40K=0.000209" 14532 1 3.5 0.1 whole rock conventional K-Ar I (KA997) "4.72E-04, 0.585E-04, 1.19E-04" 2.77 48 age of volcanism "K=2.30%, 40AR/40K=0.000203" 14533 1 2.6 0.1 whole rock conventional K-Ar K (KA973) "4.72E-04, 0.585E-04, 1.19E-04" 2.4 53 age of volcanism "K=1.99%, 40AR/40K=0.000154" 14534 1 3.2 0.1 whole rock conventional K-Ar L (KA1013) "4.72E-04, 0.585E-04, 1.19E-04" 4.06 72 age of volcanism "K=3.37%, 40AR/40K=0.000186" 14535 1 10.8 1 whole rock conventional K-Ar M (KA968) "4.72E-04, 0.585E-04, 1.19E-04" 1.31 9 age of volcanism "K=1.09%, 40AR/40K=0.000631" 14536 1 10.9 0.2 sanidine conventional K-Ar N (KA982) "4.72E-04, 0.585E-04, 1.19E-04" 7.48 95 age of volcanism "K=6.21%, 40AR/40K=0.000639" 14552 1 21.2 0.9 sanidine conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14553 1 9.95 1.02 whole rock conventional K-Ar H-8-69D(1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.254 0.0365 17 minimum age of volcanism RADIOGENIC ARGON VALUE IS FROM HART'S 1982 DISSERTATION AVERAGE OF 3 AGES IS 9.94 M.Y. 14553 2 9.81 0.97 whole rock conventional K-Ar H-8-69D(2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.254 0.036 19 minimum age of volcanism RADIOGENIC ARGON VALUE IS FROM HART'S 1982 DISSERTATION AVERAGE OF 3 AGES IS 9.94 M.Y. 14553 3 10.06 0.95 whole rock conventional K-Ar H-8-69(3) "4.962E-04, 0.581E-04, 1.1167E-04" 0.254 0.0369 21 minimum age of volcanism RADIOGENIC ARGON VALUE IS FROM HART'S 1982 DISSERTATION AVERAGE OF 3 AGES IS 9.94 M.Y. 14554 1 4.96 0.93 whole rock conventional K-Ar H-8-28D "4.962E-04, 0.581E-04, 1.1167E-04" 0.252 0.018 5 minimum age of volcanism RADIOGENIC ARGON VALUE IS FROM HART'S 1982 DISSERTATION 14555 1 7.75 0.58 whole rock conventional K-Ar H-9-37A "4.962E-04, 0.581E-04, 1.1167E-04" 0.48 0.0537 22 minimum age of volcanism RADIOGENIC ARGON VALUE IS FROM HART'S 1982 DISSERTATION A K-AR AGE FOR A FLOW ABOVE THIS DATED FLOW IS 9.57 M.Y. WHICH MAKES THIS 7.75 M.Y. AGE QUESTIONABLE 14556 1 0.12 whole rock conventional K-Ar WB-74-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.16 0.0002 1 maximum age of volcanism 14557 1 0.39 0.14 whole rock conventional K-Ar 80168 "4.962E-04, 0.581E-04, 1.1167E-04" 0.24 0.0014 3 minimum age of volcanism 14558 1 0.41 0.46 whole rock conventional K-Ar H-9-130 "4.962E-04, 0.581E-04, 1.1167E-04" 0.275 0.0016 2 minimum age of volcanism 14559 1 0.45 0.15 whole rock conventional K-Ar 80163 "4.962E-04, 0.581E-04, 1.1167E-04" 0.142 0.0009 5 minimum age of volcanism 14560 1 0.59 0.16 whole rock conventional K-Ar U-237 "4.962E-04, 0.581E-04, 1.1167E-04" 0.212 0.0018 3 minimum age of volcanism 14561 1 0.99 0.24 whole rock conventional K-Ar KT80-90 "4.962E-04, 0.581E-04, 1.1167E-04" 0.21 0.003 4 minimum age of volcanism 14562 1 1.12 0.55 whole rock conventional K-Ar SM-75-69B "4.962E-04, 0.581E-04, 1.1167E-04" 0.11 0.0017 2 minimum age of volcanism 14563 1 2.69 0.51 whole rock conventional K-Ar H-9-111A "4.962E-04, 0.581E-04, 1.1167E-04" 0.088 0.0034 13 minimum age of volcanism 14564 1 3.58 0.2 whole rock conventional K-Ar H-9-103E "4.962E-04, 0.581E-04, 1.1167E-04" 1.28 0.066 59 minimum age of volcanism 14565 1 3.59 0.24 whole rock conventional K-Ar H-9-103D "4.962E-04, 0.581E-04, 1.1167E-04" 1.19 0.0615 27 minimum age of volcanism 14566 1 5.29 0.3 whole rock conventional K-Ar H-9-103A "4.962E-04, 0.581E-04, 1.1167E-04" 1.42 0.1083 49 minimum age of volcanism 14567 1 1.12 0.24 whole rock conventional K-Ar H-9-101A "4.962E-04, 0.581E-04, 1.1167E-04" 0.142 0.0023 7 minimum age of volcanism 14568 1 2.08 0.51 whole rock conventional K-Ar H-9-101B "4.962E-04, 0.581E-04, 1.1167E-04" 0.144 0.0043 4 minimum age of volcanism 14569 1 1.96 0.23 whole rock conventional K-Ar H-9-84B "4.962E-04, 0.581E-04, 1.1167E-04" 0.221 0.0063 16 minimum age of volcanism AGE MAY BE TOO OLD 14570 1 1.45 0.25 whole rock conventional K-Ar H-9-84A "4.962E-04, 0.581E-04, 1.1167E-04" 0.373 0.0078 6 minimum age of volcanism AGE MAY BE TOO YOUNG 14571 1 1.59 0.18 whole rock conventional K-Ar H-9-93 "4.962E-04, 0.581E-04, 1.1167E-04" 0.175 0.004 19 minimum age of volcanism 14572 1 4.75 0.36 whole rock conventional K-Ar H-9-91 "4.962E-04, 0.581E-04, 1.1167E-04" 0.294 0.0201 41 minimum age of volcanism 14573 1 5.88 0.46 whole rock conventional K-Ar H-9-76 "4.962E-04, 0.581E-04, 1.1167E-04" 0.345 0.0292 27 minimum age of volcanism 14574 1 4.22 0.58 whole rock conventional K-Ar H-8-91 "4.962E-04, 0.581E-04, 1.1167E-04" 0.295 0.018 8 minimum age of volcanism 14575 1 4.58 0.91 whole rock conventional K-Ar H-8-95 "4.962E-04, 0.581E-04, 1.1167E-04" 0.212 0.014 5 age of volcanism DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 2 DETERMINATIONS IS 4.40 M.Y. 14575 2 4.21 0.83 whole rock conventional K-Ar H-8-95 "4.962E-04, 0.581E-04, 1.1167E-04" 0.212 0.0129 5 age of volcanism DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 2 DETERMINATIONS IS 4.40 M.Y. 14576 1 4.63 0.64 whole rock conventional K-Ar H-8-96 "4.962E-04, 0.581E-04, 1.1167E-04" 0.147 0.0098 14 age of volcanism DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 3 DETERMINATIONS IS 4.96 M.Y. 14576 2 4.78 0.7 whole rock conventional K-Ar H-8-96 "4.962E-04, 0.581E-04, 1.1167E-04" 0.147 0.0101 12 age of volcanism DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 3 DETERMINATIONS IS 4.96 M.Y. 14576 3 5.48 0.74 whole rock conventional K-Ar H-8-96 "4.962E-04, 0.581E-04, 1.1167E-04" 0.147 0.0116 15 age of volcanism DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 3 DETERMINATIONS IS 4.96 M.Y. 14577 1 3.37 0.2 whole rock conventional K-Ar H-8-92 "4.962E-04, 0.581E-04, 1.1167E-04" 1.15 0.0559 48 minimum age of volcanism 14578 1 0.44 0.19 whole rock conventional K-Ar H-8-75A "4.962E-04, 0.581E-04, 1.1167E-04" 0.285 0.0018 2 minimum age of volcanism 14579 1 0.06 whole rock conventional K-Ar DC-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.351 maximum age of volcanism PRACTICALLY NO RADIOGENIC ARGON PRESENT 14580 1 2.47 0.26 whole rock conventional K-Ar H-8-78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.301 0.0107 15 minimum age of volcanism 14581 1 5.8 0.39 whole rock conventional K-Ar H-9-68A "4.962E-04, 0.581E-04, 1.1167E-04" 0.437 0.0365 36 minimum age of volcanism 14582 1 5.21 0.3 whole rock conventional K-Ar H-9-68B "4.962E-04, 0.581E-04, 1.1167E-04" 0.583 0.0438 42 minimum age of volcanism 14583 1 7.03 0.45 whole rock conventional K-Ar H-8-88 "4.962E-04, 0.581E-04, 1.1167E-04" 0.657 0.0667 27 minimum age of volcanism 14584 1 6.7 0.63 whole rock conventional K-Ar H-9-3D "4.962E-04, 0.581E-04, 1.1167E-04" 0.271 0.0262 20 minimum age of volcanism 14585 1 6.91 0.66 whole rock conventional K-Ar H-9-3B "4.962E-04, 0.581E-04, 1.1167E-04" 0.26 0.0259 20 minimum age of volcanism 14586 1 5.1 0.49 whole rock conventional K-Ar H-9-6B "4.962E-04, 0.581E-04, 1.1167E-04" 0.225 0.0165 25 minimum age of volcanism 14587 1 5.08 0.59 whole rock conventional K-Ar H-9-6A "4.962E-04, 0.581E-04, 1.1167E-04" 0.169 0.0124 20 minimum age of volcanism 14588 1 5.04 0.84 whole rock conventional K-Ar H-9-27 "4.962E-04, 0.581E-04, 1.1167E-04" 0.107 0.0078 12 minimum age of volcanism 14589 1 8.11 0.62 whole rock conventional K-Ar H-9-21C "4.962E-04, 0.581E-04, 1.1167E-04" 0.539 0.0631 20 minimum age of volcanism 14590 1 6.01 0.8 whole rock conventional K-Ar H-9-21E "4.962E-04, 0.581E-04, 1.1167E-04" 0.252 0.0218 9 minimum age of volcanism 14591 1 9.34 0.68 whole rock conventional K-Ar H-9-20C "4.962E-04, 0.581E-04, 1.1167E-04" 0.443 0.0597 26 minimum age of volcanism 14592 1 8.93 0.63 whole rock conventional K-Ar H-9-20E "4.962E-04, 0.581E-04, 1.1167E-04" 0.467 0.0602 27 minimum age of volcanism 14593 1 0.91 0.36 whole rock conventional K-Ar H-9-36A "4.962E-04, 0.581E-04, 1.1167E-04" 0.168 0.0022 2 age of volcanism 14594 1 1.25 0.28 whole rock conventional K-Ar H-9-36C "4.962E-04, 0.581E-04, 1.1167E-04" 0.378 0.0068 4 age of volcanism 14595 1 9.57 0.6 whole rock conventional K-Ar H-9-37C "4.962E-04, 0.581E-04, 1.1167E-04" 0.551 0.0761 33 minimum age of volcanism 14596 1 1.49 0.18 whole rock conventional K-Ar H-9-37D "4.962E-04, 0.581E-04, 1.1167E-04" 0.429 0.0092 9 minimum age of volcanism 14597 1 8.42 0.74 whole rock conventional K-Ar H-8-69G "4.962E-04, 0.581E-04, 1.1167E-04" 0.426 0.0518 16 minimum age of volcanism 14598 1 9.95 1.02 whole rock conventional K-Ar H-8-69D "4.962E-04, 0.581E-04, 1.1167E-04" 0.254 0.0365 17 age of volcanism ANALYTICAL DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 3 DETERMINATIONS IS 9.94 M.Y. 14598 2 9.81 0.97 whole rock conventional K-Ar H-8-69D "4.962E-04, 0.581E-04, 1.1167E-04" 0.254 0.036 19 age of volcanism ANALYTICAL DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 3 DETERMINATIONS IS 9.94 M.Y. 14598 3 10.06 0.95 whole rock conventional K-Ar H-8-69D "4.962E-04, 0.581E-04, 1.1167E-04" 0.254 0.0369 21 age of volcanism ANALYTICAL DATA FROM HART'S 1982 DISSERTATION AVERAGE OF 3 DETERMINATIONS IS 9.94 M.Y. 14599 1 7.58 0.7 whole rock conventional K-Ar H-B-36 "4.962E-04, 0.581E-04, 1.1167E-04" 0.291 0.0318 20 minimum age of volcanism 14600 1 8.21 0.85 whole rock conventional K-Ar H-8-34 "4.962E-04, 0.581E-04, 1.1167E-04" 0.315 0.0373 13 minimum age of volcanism 14601 1 4.06 0.41 whole rock conventional K-Ar H-8-47 "4.962E-04, 0.581E-04, 1.1167E-04" 0.332 0.0194 13 minimum age of volcanism 14602 1 4.09 0.34 whole rock conventional K-Ar H-8-45 "4.962E-04, 0.581E-04, 1.1167E-04" 0.391 0.0189 23 minimum age of volcanism 14603 1 4.49 0.38 whole rock conventional K-Ar H-8-42 "4.962E-04, 0.581E-04, 1.1167E-04" 0.446 0.0289 17 minimum age of volcanism 14604 1 0.44 0.16 whole rock conventional K-Ar H-9-42 "4.962E-04, 0.581E-04, 1.1167E-04" 0.262 0.0017 3 age of volcanism 14605 1 3.84 0.57 whole rock conventional K-Ar H-9-44 "4.962E-04, 0.581E-04, 1.1167E-04" 0.409 0.0226 6 minimum age of volcanism 14606 1 8.51 1.02 whole rock conventional K-Ar SM-75-12A "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 0.043 9 minimum age of volcanism 14607 1 10.18 1.72 whole rock conventional K-Ar HSR-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.304 0.0447 6 minimum age of volcanism 14608 1 9.87 1.1 whole rock conventional K-Ar H-8-29 "4.962E-04, 0.581E-04, 1.1167E-04" 0.352 0.0502 11 minimum age of volcanism 14609 1 7.05 0.61 whole rock conventional K-Ar H-8-28E "4.962E-04, 0.581E-04, 1.1167E-04" 0.372 0.0378 19 minimum age of volcanism 14610 1 8.14 0.65 whole rock conventional K-Ar H-8-28C "4.962E-04, 0.581E-04, 1.1167E-04" 0.398 0.0467 21 minimum age of volcanism 14611 1 1.22 0.11 whole rock conventional K-Ar H-8-50C "4.962E-04, 0.581E-04, 1.1167E-04" 0.413 0.0072 15 THIS AGE APPEARS TO BE TOO YOUNG 14612 1 1.55 0.11 whole rock conventional K-Ar H-8-50E "4.962E-04, 0.581E-04, 1.1167E-04" 0.429 0.0096 32 minimum age of volcanism 14613 1 0.03 whole rock conventional K-Ar H-8-57 "4.962E-04, 0.581E-04, 1.1167E-04" 1.26 maximum age of volcanism RADIOMETRIC ARGON NOT MEASUREABLE 14614 1 0.09 whole rock conventional K-Ar SM-75-9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.99 maximum age of volcanism RADIOMETRIC ARGON NOT MEASUREABLE 14615 1 0.15 whole rock conventional K-Ar JC-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.692 0.0011 1 maximum age of volcanism 14616 1 0.25 0.05 whole rock conventional K-Ar H-8-70 "4.962E-04, 0.581E-04, 1.1167E-04" 1.882 0.0068 4 age of volcanism 14617 1 1.86 0.19 whole rock conventional K-Ar H-9-49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.742 0.0199 10 minimum age of volcanism 14618 1 4.81 0.45 whole rock conventional K-Ar H-9-13A "4.962E-04, 0.581E-04, 1.1167E-04" 0.341 0.0236 16 minimum age of volcanism 14619 1 4.13 0.46 whole rock conventional K-Ar H-9-13B "4.962E-04, 0.581E-04, 1.1167E-04" 0.214 0.0127 18 minimum age of volcanism 14620 1 9.11 0.65 whole rock conventional K-Ar H-9-15B "4.962E-04, 0.581E-04, 1.1167E-04" 0.351 0.0462 38 minimum age of volcanism 14621 1 8.27 0.65 whole rock conventional K-Ar H-9-15D "4.962E-04, 0.581E-04, 1.1167E-04" 0.358 0.0427 24 minimum age of volcanism 14622 1 9.73 0.76 whole rock conventional K-Ar H-9-17A "4.962E-04, 0.581E-04, 1.1167E-04" 0.424 0.0595 22 minimum age of volcanism 14623 1 10.45 0.85 whole rock conventional K-Ar H-9-17F "4.962E-04, 0.581E-04, 1.1167E-04" 0.382 0.0577 22 minimum age of volcanism 14624 1 10.06 0.82 whole rock conventional K-Ar H-9-16A "4.962E-04, 0.581E-04, 1.1167E-04" 0.38 0.0552 21 minimum age of volcanism 14625 1 10.39 0.77 whole rock conventional K-Ar H-9-16E "4.962E-04, 0.581E-04, 1.1167E-04" 0.315 0.0472 37 minimum age of volcanism 14626 1 7.2 0.76 whole rock conventional K-Ar H-9-39 "4.962E-04, 0.581E-04, 1.1167E-04" 0.397 0.0412 11 minimum age of volcanism 14627 1 10.01 1.66 whole rock conventional K-Ar H-9-38 "4.962E-04, 0.581E-04, 1.1167E-04" 0.352 0.0509 6 minimum age of volcanism 14628 1 7.62 0.4 whole rock conventional K-Ar H-9-3A "4.962E-04, 0.581E-04, 1.1167E-04" 5.49 0.6037 46 minimum age of volcanism 14629 1 13.58 0.62 whole rock conventional K-Ar H-9-26A "4.962E-04, 0.581E-04, 1.1167E-04" 5.04 0.9887 89 minimum age of volcanism 14629 2 13.07 0.59 glass conventional K-Ar H-9-26A "4.962E-04, 0.581E-04, 1.1167E-04" 5.7 1.0761 90 A MINIMUM AGE 14629 3 11.83 0.55 K feldspar conventional K-Ar H-9-26A "4.962E-04, 0.581E-04, 1.1167E-04" 6.64 1.1341 78 25-80 MESH FRACTION SPURIOUS AGE; PROBABLY DUE TO INHOMOGENEITY IN THE SAMPLE 14629 4 12.59 0.6 K feldspar conventional K-Ar H-9-26A "4.962E-04, 0.581E-04, 1.1167E-04" 4.15 0.7548 76 120-180 MESH FRACTION SPURIOUS AGE; PROBABLY DUE TO INHOMOGENEITY IN THE SAMPLE 14630 1 8.22 0.38 whole rock conventional K-Ar H-9-6C "4.962E-04, 0.581E-04, 1.1167E-04" 4.81 0.5706 80 age of volcanism AVERAGE OF 2 DETERMINATIONS IS 8.11 M.Y. 14630 2 8 0.37 whole rock conventional K-Ar H-9-6C "4.962E-04, 0.581E-04, 1.1167E-04" 4.81 0.5552 84 AVERAGE OF 2 DETERMINATIONS IS 8.11 M.Y. 14631 1 7.66 0.6 whole rock conventional K-Ar H-9-108A "4.962E-04, 0.581E-04, 1.1167E-04" 0.309 0.0342 32 minimum age of volcanism 14632 1 9.44 1.06 whole rock conventional K-Ar WB-74-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.152 0.0207 31 "THE AVERAGE OF 3 DETERMINATIONS IS 9.20 M.Y., APPROXIMATE TIME OF EXTRUSION" 14632 2 9.3 1.01 whole rock conventional K-Ar WB-74-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.152 0.0204 43 "THE AVERAGE OF 3 DETERMINATIONS IS 9.20 M.Y., APPROXIMATE TIME OF EXTRUSION" 14632 3 8.86 0.95 whole rock conventional K-Ar WB-74-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.152 0.0194 49 "THE AVERAGE OF 3 DETERMINATIONS IS 9.20 M.Y., APPROXIMATE TIME OF EXTRUSION" 14633 1 7.07 0.69 whole rock conventional K-Ar H-9-138B "4.962E-04, 0.581E-04, 1.1167E-04" 0.196 0.02 27 minimum age of volcanism 14634 1 47.3 2 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 6.223 81 age of intrusion "ANALYTICAL DATA SUPPLIED BY R.F. MARVIN (DATED MATERIAL IS PROBABLY BIOTITE, NOT HORNBLENDE, AS LISTED--COMPILER)" "RB-SR AGE OF 49.7+/-1.0 M.Y. ALSO LISTED. THESE DATES (RECALCULATED) WERE ALSO PUBLISHED BY DOVER, 1983, USGS MAP I-1319" 14639 1 1.5 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN SARNA-WOJCICKI (1976) GAVE THIS AGE AS 1.49+/-0.75 M.Y. 14640 1 145 5 hornblende conventional K-Ar (NOT GIVEN) no decay constants given age of intrusion NO ANALYTICAL DATA GIVEN 14641 1 9.3 0.4 whole rock conventional K-Ar KA969 "4.72E-04, 0.585E-04, 1.19E-04" 1.72 21 minimum age of volcanism "40AR/40K=0.000546, K=1.43%" 14642 1 26.1 0.5 biotite conventional K-Ar KA975A "4.72E-04, 0.585E-04, 1.19E-04" 6.84 87 "40AR/40K=0.001538, K=5.68%" DATE IS TOO YOUNG 14643 1 11.5 0.4 whole rock conventional K-Ar KA994 "4.72E-04, 0.585E-04, 1.19E-04" 1.84 33 "K=1.53%, 40AR/40K=0.000674" DATE IS TOO YOUNG; LOVEJOY FORMATION HAS A MINIMUM AGE OF 23 M.Y. 14644 1 28.5 0.6 sanidine conventional K-Ar KA999 "4.72E-04, 0.585E-04, 1.19E-04" 11 99 "K=9.13%, 40AR/40K=0.001679" "AGE OF RHYOLITE BOULDER, NOT NECESSARILY THE AGE OF THE GRAVEL" 14645 1 29.5 0.6 sanidine conventional K-Ar KA1011 "4.72E-04, 0.585E-04, 1.19E-04" 10.7 96 age of volcanism "K=8.88%, 40AR/40K=0.001735" 14646 1 3.2 0.1 whole rock conventional K-Ar KA1070 "4.72E-04, 0.585E-04, 1.19E-04" 2.59 80 minimum age of volcanism "K=2.15%, 40AR/40K=0.000188" 14647 1 3.2 0.1 whole rock conventional K-Ar KA1071 "4.72E-04, 0.585E-04, 1.19E-04" 2.58 36 minimum age of volcanism "K=2.14%, 40AR/40K=0.000189" 14648 1 21.9 0.4 biotite conventional K-Ar KA1072 "4.72E-04, 0.585E-04, 1.19E-04" 7.88 74 age of volcanism "K=6.54%, 40AR/40K=0.001289" 14649 1 10.1 0.5 whole rock conventional K-Ar KA1073 "4.72E-04, 0.585E-04, 1.19E-04" 1.81 22 "K=1.50%, 40AR/40K=0.000590" DATE IS TOO YOUNG; LOVEJOY FORMATION HAS A MINIMUM AGE OF 23 M.Y. 14650 1 11.6 0.6 whole rock conventional K-Ar KA1075 "4.72E-04, 0.585E-04, 1.19E-04" 1.92 26 "K=1.59%, 40AR/40K=0.000682" DATE IS TOO YOUNG; LOVEJOY FORMATION HAS A MINIMUM AGE OF 23 M.Y. 14651 1 13.6 0.4 whole rock conventional K-Ar KA1076 "4.72E-04, 0.585E-04, 1.19E-04" 1.84 34 "K=1.53%, 40AR/40K=0.000795" DATE IS TOO YOUNG; LOVEJOY FORMATION HAS A MINIMUM AGE OF 23 M.Y. 14652 1 3.5 0.7 whole rock conventional K-Ar KA1077 "4.72E-04, 0.585E-04, 1.19E-04" 1.83 8 "K=1.52%, 40AR/40K=0.000206" DATE IS TOO YOUNG; LOVEJOY FORMATION HAS A MINIMUM AGE OF 23 M.Y. 14653 1 1.2 0.1 whole rock conventional K-Ar KA1078 "4.72E-04, 0.585E-04, 1.19E-04" 1.94 49 minimum age of volcanism "K=1.61%, 40AR/40K=0.000073" 14654 1 3.1 0.1 whole rock conventional K-Ar KA1092 "4.72E-04, 0.585E-04, 1.19E-04" 2.55 85 minimum age of volcanism "K=2.12%, 40AR/40K=0.000180" 14655 1 2.9 0.1 whole rock conventional K-Ar KA1093 "4.72E-04, 0.585E-04, 1.19E-04" 2.19 59 "K=1.82%, 40AR/40K=0.000167" AGE TOO YOUNG; ROCK IS PROBABLY 3.8 M.Y. OLD 14656 1 1.3 0.1 whole rock conventional K-Ar KA1094 "4.72E-04, 0.585E-04, 1.19E-04" 3.05 71 minimum age of volcanism "K=2.53%, 40AR/40K=0.000073" 14657 1 2.2 0.1 whole rock conventional K-Ar KA1096 "4.72E-04, 0.585E-04, 1.19E-04" 2.04 86 minimum age of volcanism "K=1.69%, 40AR/40K=0.000127" 14658 1 1.9 0.1 whole rock conventional K-Ar KA1097 "4.72E-04, 0.585E-04, 1.19E-04" 2.26 86 minimum age of volcanism "K=1.88%, 40AR/40K=0.000110" 14659 1 16.1 0.3 sanidine conventional K-Ar KA1098 "4.72E-04, 0.585E-04, 1.19E-04" 10.84 99 age of volcanism "K=9.00%, 40AR/40K=0.000944" 14660 1 21.1 0.4 sanidine conventional K-Ar KA1101 "4.72E-04, 0.585E-04, 1.19E-04" 10.29 99 age of volcanism "K=8.54%, 40AR/40K=0.001239" 14661 1 2.3 0.1 whole rock conventional K-Ar KA1102 "4.72E-04, 0.585E-04, 1.19E-04" 2.54 75 minimum age of volcanism "K=2.11%, 40AR/40K=0.000134" 14662 1 3.1 0.1 whole rock conventional K-Ar KA1103 "4.72E-04, 0.585E-04, 1.19E-04" 3.16 95 minimum age of volcanism "K=2.62%, 40AR/40K=0.000184" 14663 1 7.4 0.2 plagioclase conventional K-Ar KA1109 "4.72E-04, 0.585E-04, 1.19E-04" 0.76 78 age of volcanism "K=0.63%, 40AR/40K=0.000431" 14664 1 9 0.2 plagioclase conventional K-Ar KA1110 "4.72E-04, 0.585E-04, 1.19E-04" 1.05 85 age of volcanism "K=0.87%, 40AR/40K=0.000525" 14665 1 4.8 0.1 biotite conventional K-Ar KA1119 "4.72E-04, 0.585E-04, 1.19E-04" 7.89 62 age of volcanism "K=6.55%, 40AR/40K=0.000281" 14666 1 4.7 0.1 plagioclase conventional K-Ar KA1120 "4.72E-04, 0.585E-04, 1.19E-04" 0.83 46 age of volcanism "K=0.69%, 40AR/40K=0.000275" 14667 1 20.7 0.4 sanidine conventional K-Ar KA1121 "4.72E-04, 0.585E-04, 1.19E-04" 11.28 99 age of volcanism "K=9.36%, 40AR/40K=0.001217" 14668 1 33.2 0.7 plagioclase conventional K-Ar KA1122 "4.72E-04, 0.585E-04, 1.19E-04" 0.8 66 age of volcanism "K=0.66%, 40AR/40K=0.001958" 14669 1 23.1 0.5 sanidine conventional K-Ar KA1123 "4.72E-04, 0.585E-04, 1.19E-04" 11.07 99 age of volcanism "K=9.19%, 40AR/40K=0.001358" 14670 1 9.2 0.2 biotite conventional K-Ar KA1124 "4.72E-04, 0.585E-04, 1.19E-04" 7.85 75 age of volcanism "K=6.52%, 40AR/40K=0.000537" 14671 1 20.5 0.4 sanidine conventional K-Ar KA1126 "4.72E-04, 0.585E-04, 1.19E-04" 10.49 92 age of volcanism "K=8.71%, 40AR/40K=0.001207" 14671 2 29.9 0.6 biotite conventional K-Ar KA1190 "4.72E-04, 0.585E-04, 1.19E-04" 7.18 81 "K=5.96%, 40AR/40K=0.001760" AGE IS TOO OLD; ROCK IS PROBABLY AROUND 21 M.Y. OLD 14672 1 26.1 0.5 sanidine conventional K-Ar KA1127 "4.72E-04, 0.585E-04, 1.19E-04" 10.16 99 age of volcanism "K=8.43%, 40AR/40K=0.001533" 14673 1 23.4 0.5 sanidine conventional K-Ar KA1128 "4.72E-04, 0.585E-04, 1.19E-04" 10.36 99 age of volcanism "K=8.60%, 40AR/40K=0.001376" 14674 1 22.8 0.5 sanidine conventional K-Ar KA1129 "4.72E-04, 0.585E-04, 1.19E-04" 10.34 99 age of volcanism "K=8.58%, 40AR/40K=0.001337" 14675 1 22.6 0.6 Unk conventional K-Ar KA1130 "4.72E-04, 0.585E-04, 1.19E-04" 10.16 99 age of volcanism "K=8.43%, 40AR/40K=0.001328" 14676 1 33.2 0.7 sanidine conventional K-Ar KA1131 "4.72E-04, 0.585E-04, 1.19E-04" 8.04 96 age of volcanism "K=6.67%, 40AR/40K=0.001959" 14677 1 22.8 0.5 sanidine conventional K-Ar KA1132 "4.72E-04, 0.585E-04, 1.19E-04" 10.44 99 age of volcanism "K=8.67%, 40AR/40K=0.001342" 14678 1 28.7 0.6 plagioclase conventional K-Ar KA1133 "4.72E-04, 0.585E-04, 1.19E-04" 0.48 69 "K=0.40%, 40AR/40K=0.001692" DATE TOO YOUNG; AGE IS AROUND 32 M.Y. 14678 2 32.3 plagioclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.48 age of volcanism K=0.40% 14678 3 32.5 plagioclase conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 0.48 age of volcanism K=0.40% 14679 1 3 0.1 plagioclase conventional K-Ar KA1135 "4.72E-04, 0.585E-04, 1.19E-04" 0.93 31 age of volcanism "K=0.77%, 40AR/40K=0.000176" 14680 1 23.3 0.5 sanidine conventional K-Ar KA1163 "4.72E-04, 0.585E-04, 1.19E-04" 10.82 99 "K=8.98%, 40AR/40K=0.001367" DATE IS TOO YOUNG 14681 1 0.37 0.04 plagioclase conventional K-Ar KA1167 "4.72E-04, 0.585E-04, 1.19E-04" 0.66 8 age of volcanism "K=0.55%, 40AR/40K=0.000022" 14682 1 3.5 0.1 whole rock conventional K-Ar KA1186 "4.72E-04, 0.585E-04, 1.19E-04" 2.07 30 minimum age of volcanism "K=1.72%, 40AR/40K=0.000205" 14683 1 3.3 0.1 whole rock conventional K-Ar KA1187 "4.72E-04, 0.585E-04, 1.19E-04" 2.67 85 minimum age of volcanism "K=2.22%, 40AR/40K=0.000191" 14684 1 23.8 0.6 plagioclase conventional K-Ar KA1191 "4.72E-04, 0.585E-04, 1.19E-04" 0.42 47 age of volcanism "K=0.35%, 40AR/40K=0.001270" 14685 1 28.1 0.6 plagioclase conventional K-Ar KA1200 "4.72E-04, 0.585E-04, 1.19E-04" 1.25 73 age of volcanism "K=1.04%, 40AR/40K=0.001654" 14686 1 28.1 0.6 plagioclase conventional K-Ar KA1202 "4.72E-04, 0.585E-04, 1.19E-04" 1.14 82 age of volcanism "K=0.95%, 40AR/40K=0.001656" 14687 1 22.2 0.4 sanidine conventional K-Ar KA1234 "4.72E-04, 0.585E-04, 1.19E-04" 10.41 99 age of volcanism "K=8.64%, 40AR/40K=0.001302" 14688 1 26 0.5 sanidine conventional K-Ar KA1235 "4.72E-04, 0.585E-04, 1.19E-04" 7.34 82 age of volcanism "K=6.09%, 40AR/40K=0.001527" 14689 1 53.5 1.1 plagioclase conventional K-Ar KA1253 "4.72E-04, 0.585E-04, 1.19E-04" 0.53 60 "K=0.44%, 40AR/40K=0.003173" A COMPOSITE AGE OF PEBBLES 14725 1 86.79 2 whole rock conventional K-Ar 2948 no decay constants given* 0.412 0.5274 7 age not evaluated MATERIAL DATED WAS NOT IDENTIFIED "K=0.344, 0.340%" 14726 1 108.42 2.3 whole rock conventional K-Ar 2950 no decay constants given* 0.423 0.6805 46 age not evaluated MATERIAL DATED WAS NOT IDENTIFIED "K=0.351, 0.352%" 14727 1 134.64 2.6 whole rock conventional K-Ar 2949 no decay constants given* 2.78 5.595 87 age not evaluated MATERIAL DATED WAS NOT IDENTIFIED "K=2.31, 2.31%" 14728 1 95.33 2 whole rock conventional K-Ar 3051-4 no decay constants given* 2.46 3.467 67 MATERIAL DATED WAS NOT IDENTIFIED "K=2.04, 2.04%" "POSSIBLE AGE OF CLAST, NOT ""TRABUCO"" FORMATION" 14729 1 103.76 2 whole rock conventional K-Ar 3051-6 no decay constants given* 2.42 3.721 68 MATERIAL DATED WAS NOT IDENTIFIED "K=2.01, 2.01%" "POSSIBLE AGE OF CLAST, NOT ""TRABUCO"" FORMATION" 14729 1 103.76 2 whole rock conventional K-Ar 3051-6 no decay constants given* 2.42 3.721 68 MATERIAL DATED WAS NOT IDENTIFIED "K=2.01, 2.01%" "POSSIBLE AGE OF CLAST, NOT ""TRABUCO"" FORMATION" 14730 1 120.19 2.3 whole rock conventional K-Ar 3053-9 no decay constants given* 2.99 5.35 79 MATERIAL DATED WAS NOT IDENTIFIED "K=2.48, 2.48%" "POSSIBLE AGE OF CLAST, NOT ""TRABUCO"" FORMATION" 14731 1 119.89 2 whole rock conventional K-Ar 3054-4 no decay constants given* 3.07 5.479 65 MATERIAL DATED WAS NOT IDENTIFIED "K=2.28, 2.81%" "POSSIBLE AGE OF CLAST, NOT ""TRABUCO"" FORMATION" 14732 1 107.03 2 biotite conventional K-Ar 3054-10 no decay constants given* 8.22 13.05 83 age of intrusion MATERIAL DATED WAS NOT IDENTIFIED "K=6.85, 6.80%" "CLAST AGE, NOT AGE OF ""TRABUCO"" FORMATION" 14732 2 103.45 2 biotite conventional K-Ar 3054-10 no decay constants given* 8.22 12.6 92 age of intrusion MATERIAL DATED WAS NOT IDENTIFIED "K=6.85, 6.80%" "CLAST AGE, NOT AGE OF ""TRABUCO"" FORMATION" 14733 1 101.08 2 biotite conventional K-Ar 3055-1 no decay constants given* 7.69 11.51 88 age of intrusion MATERIAL DATED WAS NOT IDENTIFIED "K=6.38, 6.38%" "CLAST AGE, NOT AGE OF ""TRABUCO"" FORMATION" 14751 1 32.6 0.7 K feldspar conventional K-Ar CHIN 445 "4.962E-04, 0.581E-04, 1.1167E-04" 5.79 27.4 9192 age of volcanism "K=4.79, 4.83%; 40AR-RAD=6.20, 6.08XE-6 CC/GM" 14752 1 32.8 0.7 K feldspar conventional K-Ar CHIN 209 "4.962E-04, 0.581E-04, 1.1167E-04" 6.415 30.56 9394 age of volcanism "K=5.34, 5.31%; 40AR-RAD=6.93, 6.77XE-6 CC/GM" 14758 1 297.28 35 hornblende conventional K-Ar 982-117 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3124 1.4535 73 "K=0.2296, 0.2890%" THE POSSIBLE AGE OF A METAMORPHIC EVENT 14759 1 150.04 3 whole rock conventional K-Ar 982-215 "4.72E-04, 0.585E-04, 1.19E-04*" 0.9646 2.1727 87 "K=0.8011, 0.8004%" AGE MAY INDICATE A THERMAL EVENT AT THIS TIME 14760 1 149.41 4 hornblende conventional K-Ar 982-201 "4.72E-04, 0.585E-04, 1.19E-04*" 0.2394 0.5369 80 "K=0.1969, 0.2005%" AGE MAY INDICATE A THERMAL EVENT AT THIS TIME 14761 1 188.67 2 hornblende conventional K-Ar 982-206 "4.72E-04, 0.585E-04, 1.19E-04*" 0.5505 1.5763 73 minimum age of metamorphic crystallization "K=0.4587, 0.4553%" 14762 1 187.46 2 hornblende conventional K-Ar 982-258 "4.72E-04, 0.585E-04, 1.19E-04*" 0.3503 0.9963 86 minimum age of metamorphic crystallization "K=0.2910, 0.2905%" 14763 1 175.85 12 hornblende conventional K-Ar 982-292 "4.72E-04, 0.585E-04, 1.19E-04*" 0.1605 0.4268 50 "K=0.1304, 0.1361%" PROBABLY A REDUCED AGE 14764 1 151.1 2 biotite conventional K-Ar 982-278A "4.72E-04, 0.585E-04, 1.19E-04*" 5.804 13.1695 82 AGE MAY INDICATE A THERMAL EVENT AT THIS TIME 14765 1 193.35 6 hornblende conventional K-Ar 21 (982-226) "4.72E-04, 0.585E-04, 1.19E-04*" 0.225 0.6611 56 age not evaluated "K=0.1845, 0.1891% (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER)" 14766 1 138.04 6 whole rock conventional K-Ar 23 (982-11) "4.72E-04, 0.585E-04, 1.19E-04*" 1.0918 2.255 88 age not evaluated K=0.9063% (ANALYTICAL DATA FROM 1978 PH.D. DISSERTATION--COMPILER) 14767 1 152.72 8 hornblende conventional K-Ar 24. (982-A-11) "4.72E-04, 0.585E-04, 1.19E-04*" 0.8811 2.0217 79 age not evaluated K=0.7314% (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER) 14768 1 133.05 6 hornblende conventional K-Ar 25 (982-53) "4.72E-04, 0.585E-04, 1.19E-04*" 0.5195 1.0327 68 age not evaluated K=0.4312 (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER) 14769 1 130.89 6 hornblende conventional K-Ar 30 (982-208) "4.72E-04, 0.585E-04, 1.19E-04*" 0.6145 1.201 78 age not evaluated K=0.5101% (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER) 14770 1 53.8 12 hornblende conventional K-Ar 31 (982-267) "4.72E-04, 0.585E-04, 1.19E-04*" 0.1983 0.1559 21 age not evaluated HORNBLENDE-PYROXENE MIXTURE K=0.1646% (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER) 14771 1 228.33 149 hornblende conventional K-Ar 31 (982-267-1) "4.72E-04, 0.585E-04, 1.19E-04*" 0.046 0.1612 18 age not evaluated HORNBLENDE-PYROXENE MIXTURE K=0.0382% (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER) 14772 1 156.61 8 hornblende conventional K-Ar 33 (982-P-3) "4.72E-04, 0.585E-04, 1.19E-04*" 0.3472 0.8178 81 age not evaluated K=0.2882% (ANALYTICAL DATA TAKEN FROM 1978 PH.D. DISSERTATION--COMPILER) 14773 1 8.7 0.4 whole rock conventional K-Ar 44. (ST-68-21) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14775 1 119.9 6 biotite conventional K-Ar 45. (P-BP-1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14776 1 114.7 6 muscovite conventional K-Ar 45. (P-BP-2) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14777 1 147 7 hornblende conventional K-Ar 45. (P-S-5) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14778 1 146.4 7 whole rock conventional K-Ar 45. (P-B) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14779 1 144.4 7 whole rock conventional K-Ar 45. (P-OB-2) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14780 1 132.7 13 whole rock conventional K-Ar 45. (DRP-4-STA 31+00) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14781 1 123 7 whole rock conventional K-Ar 45. (P-D-2A) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14782 1 122.9 6 Unk conventional K-Ar 45. (P-34) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14783 1 116.8 6 whole rock conventional K-Ar 45. (P-4A) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14784 1 110.7 6 whole rock conventional K-Ar 45. (P-26A) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14785 1 188.3 18 hornblende conventional K-Ar 45. (P-1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14786 1 120.9 6 hornblende conventional K-Ar 45. (P-A-2) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14787 1 109.6 6 whole rock conventional K-Ar 45. (P-A-1) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14788 1 120.9 6 whole rock conventional K-Ar 45. (P-OB-3) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14792 1 167 hornblende conventional K-Ar 53. (CO-8) "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 14793 1 149 biotite conventional K-Ar 55. (C-37) "4.962E-04, 0.581E-04, 1.1167E-04" PROBABLY A HYBRID DATE 14793 2 154 hornblende conventional K-Ar 55. (C-37) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN PROBABLY A HYBRID DATE 14795 1 148.4 1.1 hornblende conventional K-Ar 57. (778-9B) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14796 1 124.6 0.8 biotite conventional K-Ar 58. (778-9C) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14796 2 126.7 0.8 hornblende conventional K-Ar 58. (778-9C) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14797 1 124.9 biotite conventional K-Ar 59. (778-9C) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14797 2 124.9 hornblende conventional K-Ar 59. (778-10A) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14798 1 125.8 0.8 biotite conventional K-Ar 60. (778-10C) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14798 2 118.4 0.7 hornblende conventional K-Ar 60. (778-10C) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14799 1 124.3 0.8 hornblende conventional K-Ar 61. (778-10E) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14800 1 144.3 0.9 biotite conventional K-Ar 62. (778-10H) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14800 2 160.4 1 hornblende conventional K-Ar 62. (778-10H) "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14801 1 3.9 Unk conventional K-Ar 64 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated NO ANALYTICAL DATA GIVEN 14802 1 1820 whole rock 39Ar-40Ar total fusion 1 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1470 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14803 1 1960 whole rock 39Ar-40Ar total fusion 31-Jan "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1440 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14807 1 2240 whole rock 39Ar-40Ar total fusion 28-Feb "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 2040 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14811 1 2160 whole rock 39Ar-40Ar total fusion 6 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1950 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14812 1 1470 whole rock 39Ar-40Ar total fusion 30-Jun "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1170 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14813 1 1940 whole rock 39Ar-40Ar total fusion 1-Jul "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1490 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14814 1 1560 whole rock 39Ar-40Ar total fusion 31-Jul "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1040 M.Y. FROM 40-39AR SPECTRA SHOWS POSSIBLE RESPONSE TO A 1 B.Y. OLD THERMAL EVENT 14814 2 1420 K feldspar 39Ar-40Ar total fusion 31-Jul "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1190 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14814 3 2200 plagioclase 39Ar-40Ar total fusion 31-Jul "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1020 M.Y. FROM 40-39AR SPECTRA SHOWS POSSIBLE RESPONSE TO A 1 B.Y. OLD THERMAL EVENT 14815 1 1330 whole rock 39Ar-40Ar total fusion 1-Aug "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN; CALCULATED AGE APPEARS SPURIOUS IN RELATION TO AGES GIVEN BY FELDSPARS INFERRED MINIMUM AGE OF 1080 M.Y. FROM 40-39AR SPECTRA SHOWS POSSIBLE RESPONSE TO A 1 B.Y. OLD THERMAL EVENT 14815 2 1630 K feldspar 39Ar-40Ar total fusion 1-Aug "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1270 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14815 3 2080 plagioclase 39Ar-40Ar total fusion 1-Aug "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1260 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14816 1 1810 whole rock 39Ar-40Ar total fusion 9 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1810 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14816 2 1670 K feldspar 39Ar-40Ar total fusion 9 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1290 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14816 3 2360 plagioclase 39Ar-40Ar total fusion 9 "4.962E-04, 0.581E-04, 1.1167E-04" age not evaluated ANALYTICAL DATA NOT GIVEN INFERRED MINIMUM AGE OF 1390 M.Y. FROM 40-39AR SPECTRA SHOWS SOME RESPONSE TO POSSIBLE 1 B.Y. OLD THERMAL EVENT 14851 1 3.34 Unk conventional K-Ar KA1933 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 14852 1 32.2 0.7 K feldspar conventional K-Ar A53D "4.962E-04, 0.581E-04, 1.1167E-04" 7.32 3.356 "K=6.05, 6.05, 6.08, 6.12%; 40AR-RAD=6.90, 7.59, 7.33, 7.67, 7.78, 7.66, 7.72XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14853 1 32.3 0.7 K feldspar conventional K-Ar B6A "4.962E-04, 0.581E-04, 1.1167E-04" 7.26 3.399 "K=6.00, 6.03, 6.02, 6.09, 5.99%; 40AR-RAD=7.55, 7.84, 7.68, 7.34, 7.60, 7.46, 7.68, 7.80XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY., UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14854 1 31.6 2.1 K feldspar conventional K-Ar B11A "4.962E-04, 0.581E-04, 1.1167E-04" 7.43 3.406 "K=6.22, 6.22, 6.16, 6.23, 6.02, 6.16%; 40AR-RAD=8.23, 7.34, 7.33XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14855 1 31.2 1.5 whole rock conventional K-Ar C2A "4.962E-04, 0.581E-04, 1.1167E-04" 7.56 3.429 "K=6.35, 6.28, 6.23, 6.25%; 40AR-RAD=7.90, 7.76, 7.92, 7.16XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14856 1 32.9 0.7 K feldspar conventional K-Ar 23-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.09 3.391 8283 "K=5.87, 5.90%; 40AR-RAD=7.56, 7.64XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14857 1 31.5 0.7 K feldspar conventional K-Ar B34B "4.962E-04, 0.581E-04, 1.1167E-04" 7.02 3.21 9492 "K=5.80, 5.86%; 40AR-RAD=7.31, 7.08XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14858 1 33.1 0.7 K feldspar conventional K-Ar B34C "4.962E-04, 0.581E-04, 1.1167E-04" 6.99 3.358 8681 "K=5.75, 5.85%; 40AR-RAD=7.43, 7.62XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14859 1 31.7 0.7 K feldspar conventional K-Ar B34D "4.962E-04, 0.581E-04, 1.1167E-04" 7.05 3.237 9085 "K=5.88, 5.82%; 40AR-RAD=7.30, 7.21XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14860 1 33.3 0.7 K feldspar conventional K-Ar B34E "4.962E-04, 0.581E-04, 1.1167E-04" 7.04 3.405 8789 "K=5.78, 5.90%; 40AR-RAD= 7.78, 7.48XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14861 1 32.3 0.7 K feldspar conventional K-Ar B34F "4.962E-04, 0.581E-04, 1.1167E-04" 7.1 3.333 9291 "K=5.93, 5.86%; 40AR-RAD=7.51, 7.43XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14862 1 33.5 0.7 K feldspar conventional K-Ar B34G "4.962E-04, 0.581E-04, 1.1167E-04" 5.96 2.905 9089 "K=5.00, 4.90%; 40AR-RAD=6.63, 6.39XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14863 1 36 0.8 hornblende conventional K-Ar B34H "4.962E-04, 0.581E-04, 1.1167E-04" 1.003 0.0522 26 "K=0.828, 0.838%; 40AR-RAD=6.63, 6.39XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" THIS DATE APPEARS TO BE TOO OLD; AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14864 1 31.8 0.7 K feldspar conventional K-Ar B32B "4.962E-04, 0.581E-04, 1.1167E-04" 6.99 3.226 9392 "K=5.83, 5.77%; 40AR-RAD=7.30, 7.16XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14865 1 33.1 0.7 K feldspar conventional K-Ar B32C "4.962E-04, 0.581E-04, 1.1167E-04" 7.13 3.429 8992 "K=5.88, 5.95%; 40AR-RAD=7.71, 7.66XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14866 1 31.7 0.7 K feldspar conventional K-Ar B32D "4.962E-04, 0.581E-04, 1.1167E-04" 7.07 3.253 9493 "K=5.87, 5.87%; 40AR-RAD=7.35, 7.23XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14867 1 32.6 0.7 K feldspar conventional K-Ar B32F "4.962E-04, 0.581E-04, 1.1167E-04" 6.91 3.28 9393 "K=5.77, 5.66, 5.79%; 40AR-RAD=7.47, 7.23XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14868 1 32 1.7 K feldspar conventional K-Ar B32G "4.962E-04, 0.581E-04, 1.1167E-04" 6.8 3.162 "K=5.62, 5.67%; 40AR-RAD= 7.12, 6.70, 7.44XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14869 1 32.2 1.2 K feldspar conventional K-Ar B32H "4.962E-04, 0.581E-04, 1.1167E-04" 7.43 3.475 "K=6.22, 6.12%; 40AR-RAD=7.91, 7.48, 7.97XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14870 1 32.3 0.7 K feldspar conventional K-Ar B32I "4.962E-04, 0.581E-04, 1.1167E-04" 7.38 3.46 9490 "K=6.16, 6.10%; 40AR-RAD=7.85, 7.66XE-6 SCC/GM (ANALYTICAL DATA SUPPLIED BY C.D. HENRY, UNIV. OF TEXAS AT AUSTIN)" AVERAGE OF 18 K-FELDSPAR AGES IS 32.3+/-0.7 M.Y. 14871 1 11.14 0.2 sanidine conventional K-Ar JMP-1 "4.72E-04, 0.585E-04, 1.19E-04*" 6.23 1.002 70 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14872 1 44.71 0.8 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 5.338 74 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14873 1 13.8 0.5 sanidine conventional K-Ar BE-27 "4.962E-04, 0.581E-04, 1.1167E-04" 0.8263 80 age of volcanism ANALYTICAL DATA SUPPLIED BY R.F. MARVIN 14874 1 9.7 1.5 plagioclase conventional K-Ar JK-A "4.72E-04, 0.585E-04, 1.19E-04" 0.1967 20 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14875 1 9.4 2 plagioclase conventional K-Ar JK-B "4.72E-04, 0.585E-04, 1.19E-04" 0.2113 16 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975." 14876 1 10.97 0.7 sanidine conventional K-Ar BN-A "4.72E-04, 0.585E-04, 1.19E-04*" 7.85 1.244 38 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14877 1 11.97 0.2 sanidine conventional K-Ar PS-C "4.72E-04, 0.585E-04, 1.19E-04*" 9.62 1.663 76 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14878 1 13.46 0.2 sanidine conventional K-Ar PS-A "4.72E-04, 0.585E-04, 1.19E-04*" 9.6 1.8675 75 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14879 1 14.19 0.4 sanidine conventional K-Ar PS-1 "4.72E-04, 0.585E-04, 1.19E-04*" 7.86 1.612 60 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14880 1 11.44 0.6 sanidine conventional K-Ar RYN-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.21 1.522 44 age of volcanism "ANALYTICAL DATA TAKEN FROM W.M. NEILL'S STUDENT RESEARCH PROJECT, STANFORD UNIV., 1975" 14881 1 9.55 0.2 sanidine conventional K-Ar SF-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.63 1.19 74 age of volcanism 14882 1 10.7 1.3 plagioclase conventional K-Ar CAS-6 "4.72E-04, 0.585E-04, 1.19E-04" 0.1384 25 THIS DATE IS APPARENTLY TOO OLD 14883 1 10.11 0.1 sanidine conventional K-Ar CAS-1 "4.72E-04, 0.585E-04, 1.19E-04*" 9.46 1.381 81 age of volcanism 14884 1 10.98 0.6 plagioclase conventional K-Ar BEN-1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.276 0.2023 42 age of volcanism 14949 1 108.2 biotite 39Ar-40Ar incremental (plateau) PCP-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling TOTAL GAS AGE=105.7 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14949 2 143.8 0.7 amphiboles 39Ar-40Ar incremental (plateau) PCP-1 "4.962E-04, 0.581E-04, 1.1167E-04" FERROHASTINGSITE TOTAL GAS AGE=171.0 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA THIS AGE IS RELATED TO REGIONAL METAMORPHISM DURING THE JURASSIC 14957 1 99.2 biotite 39Ar-40Ar incremental (plateau) PCP-4 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling TOTAL GAS AGE=97.2 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14957 2 487.6 amphiboles 39Ar-40Ar total fusion PCP-4 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism FERROHASTINGSITE SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14963 1 126.3 biotite 39Ar-40Ar total fusion PCP-10 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14963 2 1152.3 amphiboles 39Ar-40Ar total fusion PCP-10 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism FERROHASTINGSITE SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14964 1 98.6 biotite 39Ar-40Ar incremental (plateau) PCP-11 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling TOTAL GAS AGE=97.5 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14965 1 987.1 amphiboles 39Ar-40Ar total fusion PCP-12 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism FERROHASTINGSITE SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14966 1 90.4 biotite 39Ar-40Ar incremental (plateau) PCP-13 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling TOTAL GAS AGE=90.4 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14967 1 1450 hornblende 39Ar-40Ar incremental (plateau) PCM-1 "4.962E-04, 0.581E-04, 1.1167E-04" TOTAL GAS AGE=1588.5 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA TOTAL GAS AGE IS PROBABLY SPURIOUS; PLATEAU AGE PROBABLY INDICATES END OF PROTEROZOIC METAMORPHIC PERIOD 14968 1 167.4 biotite 39Ar-40Ar total fusion PCI-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14969 1 90.7 hornblende 39Ar-40Ar incremental (plateau) MZP-1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion TOTAL GAS AGE=90.7 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14974 1 80.7 biotite 39Ar-40Ar total fusion MZP-12 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14974 2 90.6 hornblende 39Ar-40Ar incremental (plateau) MZP-12 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion TOTAL GAS AGE=90.3 M.Y.; SEE ARTICLE FOR COMPLETE ANALYTICAL DATA 14976 1 3.4 0.2 biotite conventional K-Ar 1. ES102 "4.962E-04, 0.581E-04, 1.1167E-04" 7.99 0.3929 32 age of volcanism 14977 1 2.5 0.3 whole rock conventional K-Ar 2. ES179 "4.962E-04, 0.581E-04, 1.1167E-04" 2.047 0.0745 8 minimum age of volcanism 14978 1 3.7 0.7 whole rock conventional K-Ar 3. ES219 "4.962E-04, 0.581E-04, 1.1167E-04" 1.164 0.0619 6 minimum age of volcanism 14979 1 7.4 0.4 whole rock conventional K-Ar 4. ES442 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.0829 4 minimum age of volcanism 14980 1 7.5 0.3 whole rock conventional K-Ar 5. ES443 "4.962E-04, 0.581E-04, 1.1167E-04" 2.146 0.2325 8 minimum age of volcanism 14981 1 4.2 0.3 whole rock conventional K-Ar 6. ES449 "4.962E-04, 0.581E-04, 1.1167E-04" 2.164 0.1321 7 minimum age of volcanism 14982 1 4.6 0.5 whole rock conventional K-Ar 7. ES458 "4.962E-04, 0.581E-04, 1.1167E-04" 1.375 0.0923 7 minimum age of volcanism 14983 1 4 0.3 whole rock conventional K-Ar 8. ES459 "4.962E-04, 0.581E-04, 1.1167E-04" 1.075 0.0618 14 minimum age of volcanism 14984 1 25.9 0.8 biotite conventional K-Ar 1. 79-RA-100 "4.962E-04, 0.581E-04, 1.1167E-04" 7.37 2.7635 49 age of volcanism 14985 1 5.2 0.8 hornblende conventional K-Ar 2. 79-RA-43 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.0467 4 age of intrusion 14986 1 4.7 0.2 biotite conventional K-Ar 3. 79-RA-46 "4.962E-04, 0.581E-04, 1.1167E-04" 8.67 0.5814 76 age of volcanism 14987 1 6.3 0.5 K feldspar conventional K-Ar 4. 80-P-26 "4.962E-04, 0.581E-04, 1.1167E-04" 9.19 0.0841 6 THERE IS SOME QUESTION AS TO THE INTERPRETATION OF THIS AGE 14988 1 4 0.2 biotite conventional K-Ar 5. 75-K-54 "4.962E-04, 0.581E-04, 1.1167E-04" 8.51 0.4946 33 age of intrusion 14989 1 10.6 0.4 biotite conventional K-Ar 6. 80-DJ-66 "4.962E-04, 0.581E-04, 1.1167E-04" 7.59 1.2192 27 age of volcanism 14990 1 5.8 0.5 hornblende conventional K-Ar 7. LPA "4.962E-04, 0.581E-04, 1.1167E-04" 0.778 0.0653 21 age of volcanism 14991 1 9.4 0.8 hornblende conventional K-Ar 8. 1-94-9J "4.962E-04, 0.581E-04, 1.1167E-04" 7.66 0.1044 11 age of volcanism 14992 1 7.8 0.3 biotite conventional K-Ar 9. 4-23-10J "4.962E-04, 0.581E-04, 1.1167E-04" 8.24 0.9255 38 age of volcanism 14993 1 18.4 1.8 hornblende conventional K-Ar 10. 4-23-9J "4.962E-04, 0.581E-04, 1.1167E-04" 0.634 0.1169 10 age of volcanism 14994 1 10.1 0.4 biotite conventional K-Ar 11. 4-7-35J "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 1.2088 40 age of volcanism 14995 1 12.8 0.4 alunite conventional K-Ar 12. 61581-4 "4.962E-04, 0.581E-04, 1.1167E-04" 7.78 1.4358 65 TIME OF MINERALIZATION 14996 1 15 0.5 whole rock conventional K-Ar 13. 210-2 "4.962E-04, 0.581E-04, 1.1167E-04" 3.26 0.7076 15 minimum age of volcanism 14997 1 15.7 0.5 whole rock conventional K-Ar 14. 149-6 "4.962E-04, 0.581E-04, 1.1167E-04" 3.48 0.7873 49 minimum age of volcanism 14998 1 15.8 0.5 whole rock conventional K-Ar 15. 145-14 "4.962E-04, 0.581E-04, 1.1167E-04" 2.365 0.5413 44 minimum age of volcanism 14999 1 12 0.6 biotite conventional K-Ar 16. 1-115-30J "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 1.4393 35 age of volcanism 15000 1 69.8 2.5 biotite conventional K-Ar CG-2-305/325 "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 9.218 71 minimum age of intrusion K=7.463% 15001 1 68.6 2.5 biotite conventional K-Ar CG-2-275/279 "4.962E-04, 0.581E-04, 1.1167E-04" 8.76 8.823 41 minimum age of intrusion K=7.272% 15002 1 64.2 2.3 muscovite conventional K-Ar CG-10-618/625 "4.962E-04, 0.581E-04, 1.1167E-04" 10.75 10.12 61 K=8.924% THIS MAY BE THE TIME OF MINERALIZATION 15037 1 3.09 1.2 whole rock conventional K-Ar 14 "4.72E-04, 0.585E-04, 1.19E-04*" 1.54 0.0686 5 minimum age of volcanism 15038 1 2.91 0.5 whole rock conventional K-Ar F-158 "4.72E-04, 0.585E-04, 1.19E-04*" 1.28 0.0537 11 minimum age of volcanism 15039 1 6.61 3.2 whole rock conventional K-Ar W-352 "4.72E-04, 0.585E-04, 1.19E-04*" 0.629 0.06 4 ROCK MAY HAVE CONSIDERABLE DEVITRIFIED GLASS AGE IS APPARENTLY SPURIOUS--TOO OLD 15040 1 3.6 0.1 K feldspar conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 6.5 0.3368 40 age of intrusion 15040 2 7.01 3.9 pyroxenes conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.126 0.0127 5 ROCK IS PROBABLY 3.5 M.Y. OLD 15097 1 646 16 hornblende conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.296 3.363 93 ROCK PROBABLY CRYSTALLIZED 630 M.Y. AGO 15098 1 630 14 hornblende conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.885 9.695 90 age of intrusion ROCK PROBABLY CRYSTALLIZED 630 M.Y. AGO 15099 1 612 12 hornblende conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.971 10.21 94 ROCK PROBABLY CRYSTALLIZED 630 M.Y. AGO 15100 1 394 8 hornblende conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.163 7.378 94 K-AR AGE IS A REDUCED AGE; ROCK PROBABLY CRYSTALLIZED 630 M.Y. AGO 15101 1 886 22 hornblende conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.342 5.725 93 "AGE MAY BE A MINIMUM FOR THIS ROCK, OR THE AGE MAY BE SPURIOUS AND THE ROCK IS AROUND 630 M.Y. OLD" 15102 1 377 6 hornblende conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 1.354 8.184 95 THIS AGE IS A REDUCED AGE; ROCK IS PROBABLY 630 M.Y. OLD 15169 1 9.9 0.3 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN THE AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15169 2 9.3 0.3 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN THE AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15169 3 9.2 0.8 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN THE AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15169 4 9.5 0.3 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN THE AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15170 1 10 0.4 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15170 2 9.7 0.3 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15170 3 9.8 0.3 whole rock conventional K-Ar CA-1 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN AVERAGE AGE OF 8 DETERMINATIONS IS 9.6 M.Y. 15171 1 11.3 1 whole rock conventional K-Ar A1031(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15172 1 8.1 0.5 whole rock conventional K-Ar A1032(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15173 1 8.7 1.3 whole rock conventional K-Ar A1033(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15174 1 10.7 1.1 whole rock conventional K-Ar A1034(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15175 1 10.5 0.7 whole rock conventional K-Ar CA-11(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15176 1 10.8 0.8 whole rock conventional K-Ar CA-12 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15177 1 10.4 1.5 whole rock conventional K-Ar A1035(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15178 1 14.1 3 whole rock conventional K-Ar CA-13(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15178 2 9.1 2.1 whole rock conventional K-Ar CA-13(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15179 1 11 0.3 whole rock conventional K-Ar A1036(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15180 1 10.9 0.3 whole rock conventional K-Ar CA-18(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15180 2 11.2 0.3 whole rock conventional K-Ar CA-18(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15181 1 10.3 0.5 whole rock conventional K-Ar A1038(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15182 1 12.1 0.4 whole rock conventional K-Ar CA-19(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15182 2 12.9 0.4 whole rock conventional K-Ar CA-19(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15183 1 11.3 0.3 whole rock conventional K-Ar A-1039 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15184 1 10.8 2 whole rock conventional K-Ar CA-20(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15185 1 11.6 1 whole rock conventional K-Ar CA-21(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15186 1 11.9 0.4 whole rock conventional K-Ar CA-22(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15186 2 13.2 1 whole rock conventional K-Ar CA-22(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15187 1 12.7 1 whole rock conventional K-Ar A1041(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15188 1 13.1 0.7 whole rock conventional K-Ar CA-24(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15189 1 15 0.8 whole rock conventional K-Ar A1043(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15190 1 12.6 0.4 whole rock conventional K-Ar CA-27 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15191 1 13.6 0.4 whole rock conventional K-Ar CA-29 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15192 1 13.6 0.6 whole rock conventional K-Ar CA-30 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15193 1 12.1 0.4 whole rock conventional K-Ar CA-31(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15194 1 16.2 0.6 whole rock conventional K-Ar CA-39 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15195 1 13.3 3.6 whole rock conventional K-Ar A-1171 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15196 1 8.6 0.9 whole rock conventional K-Ar CA-54 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15197 1 10.5 2.5 whole rock conventional K-Ar A-1057 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15198 1 12 6.1 whole rock conventional K-Ar CA-61 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15199 1 14.5 0.6 whole rock conventional K-Ar CA-62 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15200 1 14.7 0.5 whole rock conventional K-Ar CA-63 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15201 1 12.9 0.3 whole rock conventional K-Ar CA-64 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15202 1 12.4 0.3 whole rock conventional K-Ar CA-65 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15203 1 15.3 0.4 whole rock conventional K-Ar CA-71 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15204 1 15.4 0.4 whole rock conventional K-Ar CA-72 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15205 1 15.3 0.4 whole rock conventional K-Ar CA-73 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15206 1 8.5 0.3 whole rock conventional K-Ar A2001 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15207 1 7.9 0.3 whole rock conventional K-Ar A2002 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15208 1 11.3 0.3 whole rock conventional K-Ar A2003 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15209 1 8.1 0.6 whole rock conventional K-Ar A2006 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15210 1 12 0.4 whole rock conventional K-Ar A2009 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15211 1 9.1 0.3 whole rock conventional K-Ar A2011 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15212 1 10.5 1.5 whole rock conventional K-Ar A2012 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15213 1 8.6 0.3 whole rock conventional K-Ar A2014 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15214 1 10.9 1 whole rock conventional K-Ar A2016 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15215 1 10.9 0.3 whole rock conventional K-Ar A2017 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15216 1 11.2 0.3 whole rock conventional K-Ar A2018 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15217 1 10.4 0.3 whole rock conventional K-Ar A2019 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15218 1 14.4 0.4 whole rock conventional K-Ar A2021 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15219 1 13.8 0.4 whole rock conventional K-Ar A2022 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15220 1 14.5 0.4 whole rock conventional K-Ar A2027 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15221 1 14.5 0.4 whole rock conventional K-Ar A2028 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15222 1 14.2 0.4 whole rock conventional K-Ar A2029 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15223 1 14.3 0.4 whole rock conventional K-Ar A2032 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15224 1 15.3 0.5 whole rock conventional K-Ar A2033 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15225 1 15.3 0.5 whole rock conventional K-Ar A2034 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15226 1 12.5 0.4 whole rock conventional K-Ar A2036 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15227 1 14.6 0.4 whole rock conventional K-Ar A2037 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15228 1 14 0.4 whole rock conventional K-Ar A2038 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15229 1 16.3 0.5 whole rock conventional K-Ar A2039 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15230 1 15.2 0.5 whole rock conventional K-Ar A2040 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15231 1 13.2 0.4 whole rock conventional K-Ar A2041 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15232 1 14.6 0.4 whole rock conventional K-Ar A2043 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15233 1 11.5 0.4 whole rock conventional K-Ar A2045 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15234 1 14 0.4 whole rock conventional K-Ar A2046 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15235 1 13.7 0.4 whole rock conventional K-Ar A2048 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15236 1 12.7 0.4 whole rock conventional K-Ar A2049 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15237 1 12.9 0.4 whole rock conventional K-Ar A2050 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15238 1 13.3 0.4 whole rock conventional K-Ar A2051 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15239 1 16.1 1.6 whole rock conventional K-Ar A2054 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15240 1 13.6 0.6 whole rock conventional K-Ar A2055 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15241 1 12.7 0.6 whole rock conventional K-Ar A2056 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15242 1 13.9 0.8 whole rock conventional K-Ar A2057 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15243 1 13.5 0.9 whole rock conventional K-Ar A2063 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15244 1 13.6 1.1 whole rock conventional K-Ar A2064 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15245 1 12.8 0.9 whole rock conventional K-Ar A2065 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15246 1 12.1 0.7 whole rock conventional K-Ar A2066 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15247 1 16 1.4 whole rock conventional K-Ar A2067 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15248 1 9.5 0.3 whole rock conventional K-Ar A4003 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15249 1 10 4.1 whole rock conventional K-Ar A4004 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15249 2 7.7 4.3 whole rock conventional K-Ar A4004 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15250 1 9.3 4.5 whole rock conventional K-Ar A4006 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN AVERAGE AGE OF 3 DETERMINATIONS IS 10.2 M.Y. 15250 2 10.3 3.2 whole rock conventional K-Ar A4006 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN AVERAGE AGE OF 3 DETERMINATIONS IS 10.2 M.Y. 15250 3 10.9 0.5 whole rock conventional K-Ar A4006 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN AVERAGE AGE OF 3 DETERMINATIONS IS 10.2 M.Y. 15251 1 11 3.4 whole rock conventional K-Ar A4008 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15252 1 11.9 3.3 whole rock conventional K-Ar A4009 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15253 1 11 1.6 whole rock conventional K-Ar A4011 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15254 1 10.4 0.6 whole rock conventional K-Ar A4012 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15254 2 12.8 3.2 whole rock conventional K-Ar A4012 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15255 1 17 3.6 whole rock conventional K-Ar A4013 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15256 1 15.8 2.9 whole rock conventional K-Ar A4014 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15256 2 1.3 0.7 whole rock conventional K-Ar A4014 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN (AGE LOOKS TOO YOUNG; MAY BE A PRINTING ERROR--COMPILER) 15257 1 14.1 3 whole rock conventional K-Ar A4202 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15258 1 12.7 0.3 whole rock conventional K-Ar A4017 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15259 1 14.4 0.3 whole rock conventional K-Ar A4212 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15260 1 13.1 1.3 whole rock conventional K-Ar A4019 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15261 1 15 0.3 whole rock conventional K-Ar A4213 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15262 1 11.9 1.4 whole rock conventional K-Ar A4023(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15263 1 13.6 0.4 whole rock conventional K-Ar A4214(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15264 1 13.2 1.3 whole rock conventional K-Ar A4026(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15265 1 13.9 0.3 whole rock conventional K-Ar A4215(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15266 1 15.3 1.4 whole rock conventional K-Ar A4027 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15267 1 13.4 0.5 whole rock conventional K-Ar A4028 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15268 1 14.7 0.3 whole rock conventional K-Ar A4217(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15269 1 15 1.3 whole rock conventional K-Ar A4029 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15270 1 15.5 1.6 whole rock conventional K-Ar A4030 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15271 1 14.9 0.3 whole rock conventional K-Ar A4218 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15272 1 14.4 1.4 whole rock conventional K-Ar A4031 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15273 1 14.5 0.3 whole rock conventional K-Ar A4219 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15274 1 13.9 0.5 whole rock conventional K-Ar A4032(?) no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15275 1 13.9 1.9 whole rock conventional K-Ar A4033 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15276 1 13.8 0.4 whole rock conventional K-Ar A4035 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15277 1 14.1 0.3 whole rock conventional K-Ar A4040 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15278 1 14 0.3 whole rock conventional K-Ar A4041 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15279 1 11.6 1.9 whole rock conventional K-Ar A4047 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15280 1 11 1.5 whole rock conventional K-Ar A4048 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15281 1 13.2 1.5 whole rock conventional K-Ar A4055 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15282 1 15 1.8 whole rock conventional K-Ar A4060 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15283 1 15.2 1.4 whole rock conventional K-Ar A4061 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15284 1 14.3 0.3 whole rock conventional K-Ar A4224 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15285 1 15.7 1.4 whole rock conventional K-Ar A4062 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15286 1 14.4 0.3 whole rock conventional K-Ar A4225 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15287 1 15.5 1.3 whole rock conventional K-Ar A4063 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15288 1 12 2.9 whole rock conventional K-Ar A5008 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15289 1 11.9 3.6 whole rock conventional K-Ar A5009 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15290 1 11.7 2.6 whole rock conventional K-Ar A5010 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15291 1 12.8 3.1 whole rock conventional K-Ar A5011 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15292 1 17.8 6.5 whole rock conventional K-Ar A5013 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15293 1 14.5 2.7 whole rock conventional K-Ar A5014 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15294 1 14.9 1.5 whole rock conventional K-Ar A5021 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15295 1 14.5 1.3 whole rock conventional K-Ar A5022 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15296 1 14.6 1.9 whole rock conventional K-Ar A5023 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15297 1 15.5 1.1 whole rock conventional K-Ar A5025 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15298 1 14.7 1.2 whole rock conventional K-Ar A5027 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15299 1 13.7 2 whole rock conventional K-Ar A5028 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15300 1 15.6 2.1 whole rock conventional K-Ar A5029 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15301 1 15.6 1.5 whole rock conventional K-Ar A5030 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15302 1 13.3 1.5 whole rock conventional K-Ar A5032 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15303 1 15.9 1.2 whole rock conventional K-Ar A5033 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15304 1 16.6 1.2 whole rock conventional K-Ar A5058 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15305 1 14.1 1.1 whole rock conventional K-Ar A5059 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15306 1 13.5 2.1 whole rock conventional K-Ar A5060 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15307 1 13.6 0.3 whole rock conventional K-Ar A5061 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15308 1 15.5 0.3 whole rock conventional K-Ar A5062 no decay constants given age not evaluated NO ANALYTICAL DATA GIVEN 15309 1 309.06 30.8 tremolite conventional K-Ar 55ATR109 "4.72E-04, 0.585E-04, 1.19E-04*" 0.03 0.1456 30 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15310 1 90 2.7 biotite conventional K-Ar 71 F 17 "4.72E-04, 0.585E-04, 1.19E-04" 12.81 85 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15311 1 180 5.4 muscovite conventional K-Ar 72 E 56B "4.72E-04, 0.585E-04, 1.19E-04" 30.72 88 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978." 15312 1 126 3.8 muscovite conventional K-Ar 72 E 100R "4.72E-04, 0.585E-04, 1.19E-04" 19.74 93 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15313 1 93.6 2.8 biotite conventional K-Ar 72 E 222 "4.72E-04, 0.585E-04, 1.19E-04" 12.21 93 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15313 2 97.9 2.9 muscovite conventional K-Ar 72 E 222 "4.72E-04, 0.585E-04, 1.19E-04" 16.26 95 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15314 1 292.14 57.4 actinolite conventional K-Ar 72 F 10ARG2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.032 0.1461 15 K20 VALUE IS AVERAGE OF 8 DETERMINATIONS RANGING FROM 0.028-0.042% "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15314 2 295.09 57.8 actinolite conventional K-Ar 72 F 10ARG2 "4.72E-04, 0.585E-04, 1.19E-04*" 0.032 0.1477 17 K20 VALUE IS AVERAGE OF 8 DETERMINATIONS RANGING FROM 0.028-0.042% "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15315 1 96.4 2.9 biotite conventional K-Ar 72 C 211 "4.72E-04, 0.585E-04, 1.19E-04" 13.42 81 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15316 1 87.3 2.6 biotite conventional K-Ar 72 PE 92 "4.72E-04, 0.585E-04, 1.19E-04" 11.14 85 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15316 2 85.8 2.6 biotite conventional K-Ar 72 PE 92 "4.72E-04, 0.585E-04, 1.19E-04" 10.95 81 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15316 3 113 3.4 muscovite conventional K-Ar 72 PE 92 "4.72E-04, 0.585E-04, 1.19E-04" 18.91 96 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15317 1 97.8 2.9 biotite conventional K-Ar 73 ABE 10B "4.72E-04, 0.585E-04, 1.19E-04" 9.338 69 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15317 2 113 3.4 hornblende conventional K-Ar 73 ABE 108 "4.72E-04, 0.585E-04, 1.19E-04" 0.3063 51 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15318 1 102 3.1 biotite conventional K-Ar 73 ATR 15.2 "4.72E-04, 0.585E-04, 1.19E-04" 13.65 90 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15318 2 115 3.5 muscovite conventional K-Ar 73 ATR 15.2 "4.72E-04, 0.585E-04, 1.19E-04" 18.36 90 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15319 1 113 3.4 muscovite conventional K-Ar 73 ATR 20.2 "4.72E-04, 0.585E-04, 1.19E-04" 17.4 95 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15320 1 167 8.3 actinolite conventional K-Ar 73 ATR 45.2 "4.72E-04, 0.585E-04, 1.19E-04" 0.3411 60 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15320 2 170 8.5 actinolite conventional K-Ar 73 ATR 45.2 "4.72E-04, 0.585E-04, 1.19E-04" 0.3482 60 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15320 3 114 3.4 muscovite conventional K-Ar 73 ATR 45.2 "4.72E-04, 0.585E-04, 1.19E-04" 16.2 91 IMPURE MUSCOVITE "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15321 1 102 3.1 biotite conventional K-Ar 73 ATR 105.4 "4.72E-04, 0.585E-04, 1.19E-04" 12.78 75 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15321 2 112 3.4 muscovite conventional K-Ar 73 ATR 105.4 "4.72E-04, 0.585E-04, 1.19E-04" 19.03 85 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15322 1 110 3.3 muscovite conventional K-Ar 73 B 33 "4.72E-04, 0.585E-04, 1.19E-04" 18.87 88 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15323 1 200 12 tremolite conventional K-Ar 73 G 64 "4.72E-04, 0.585E-04, 1.19E-04" 40.49 53 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15324 1 106 3.2 muscovite conventional K-Ar 73 BE 58 "4.72E-04, 0.585E-04, 1.19E-04" 14.07 89 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15325 1 136 4.1 muscovite conventional K-Ar 73 PE 32 "4.72E-04, 0.585E-04, 1.19E-04" 21.29 90 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15326 1 102 3 biotite conventional K-Ar 73 RR 6EF "4.72E-04, 0.585E-04, 1.19E-04" 14.72 89 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15326 2 103 3 biotite conventional K-Ar 73 RR 6EF "4.72E-04, 0.585E-04, 1.19E-04" 14.92 93 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15326 3 112 3.3 muscovite conventional K-Ar 73 RR 6EF "4.72E-04, 0.585E-04, 1.19E-04" 19.02 93 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15327 1 587 58 glaucophane-crossite conventional K-Ar 73 RR 7G "4.72E-04, 0.585E-04, 1.19E-04" 0.3867 52 "A REDUCED AGE; GLAUCOPHANE PROBABLY FORMED 636 M.Y. (OR MORE) AGO. CALCULATED AGE ALSO REPORTED BY TURNER, FORBES AND MAYFIELD, 1978" 15327 2 125 3.7 muscovite conventional K-Ar 73 RR 7G "4.72E-04, 0.585E-04, 1.19E-04" 9.631 65 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15327 3 636 38 glaucophane-crossite 40Ar-40K isochron 73 RR 7G "4.72E-04, 0.585E-04, 1.19E-04" 0.3867 52 636 maximum age of volcanism 7-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15327 4 695 glaucophane-crossite 40Ar-40K isochron 73 RR 7G "4.72E-04, 0.585E-04, 1.19E-04" 0.3867 52 637 6-POINT 40AR-40K ISOCHRON "THIS AGE REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15327 5 633 glaucophane-crossite 40Ar-40K isochron 73 RR 7G "4.72E-04, 0.585E-04, 1.19E-04" 0.3867 52 638 5-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978." 15328 1 128 3.8 muscovite conventional K-Ar 73 RR 10-1C "4.72E-04, 0.585E-04, 1.19E-04" 19.02 88 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15329 1 129 3.9 biotite conventional K-Ar 73 RR 18F "4.72E-04, 0.585E-04, 1.19E-04" 18 91 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15329 2 127 3.8 muscovite conventional K-Ar 73 RR 18F "4.72E-04, 0.585E-04, 1.19E-04" 21.03 85 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15330 1 566.16 67 glaucophane-crossite conventional K-Ar 73 RR 31C "4.72E-04, 0.585E-04, 1.19E-04*" 0.028 0.2681 57 minimum age of metamorphic crystallization IMPURE GLAUCOPHANE K20 VALUE IS AVERAGE OF 6 DETERMINATIONS RANGING FROM 0.23-0.31% "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15331 1 162.76 6.4 actinolite conventional K-Ar 73 RR 45C "4.72E-04, 0.585E-04, 1.19E-04*" 0.111 0.2722 42 K20 VALUE IS AVERAGE OF 8 DETERMINATIONS RANGING FROM 0.106-0.115% "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15332 1 611 30.5 glaucophane-crossite conventional K-Ar 73 RR 52 "4.72E-04, 0.585E-04, 1.19E-04" 0.3705 67 "AVERAGE MINIMUM AGE OF 630 M.Y. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15332 2 649 32.5 glaucophane-crossite conventional K-Ar 73 RR 52 "4.72E-04, 0.585E-04, 1.19E-04" 0.3979 69 "AVERAGE MINIMUM AGE OF 630 M.Y. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15332 3 636 38 glaucophane-crossite 40Ar-40K isochron 73 RR 52 "4.72E-04, 0.585E-04, 1.19E-04" 0.3705 67 636 maximum age of volcanism 7-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15332 4 695 glaucophane-crossite 40Ar-40K isochron 73 RR 52 "4.72E-04, 0.585E-04, 1.19E-04" 0.3705 67 637 6-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15332 5 633 glaucophane-crossite 40Ar-40K isochron 73 RR 52 "4.72E-04, 0.585E-04, 1.19E-04" 0.3705 67 638 5-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES AND MAYFIELD, 1978" 15333 1 1690 84.5 glaucophane-crossite conventional K-Ar 73 RR 54 "4.72E-04, 0.585E-04, 1.19E-04" 1.508 82 "SPURIOUS AGE; TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15333 2 1680 84 glaucophane-crossite conventional K-Ar 73 RR 54 "4.72E-04, 0.585E-04, 1.19E-04" 1.496 83 "SPURIOUS AGE; TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15334 1 345 17.3 actinolite conventional K-Ar 73 RR 75-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.3973 64 IMPURE ACTINOLITE "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15335 1 314 15.7 actinolite conventional K-Ar 74 ABE 21B "4.72E-04, 0.585E-04, 1.19E-04" 0.2245 16 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15336 1 97.7 2.9 phlogopite conventional K-Ar 74 ABE 222F "4.72E-04, 0.585E-04, 1.19E-04" 14.54 87 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15337 1 622 31.1 actinolite conventional K-Ar 74 AF 144-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.9916 65 minimum age of metamorphic crystallization "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15337 2 636 38 actinolite 40Ar-40K isochron 74 AF 144-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.9916 65 636 minimum age of metamorphic crystallization 7-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15337 3 695 actinolite 40Ar-40K isochron 74 AF 144-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.9916 65 637 6-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15337 4 633 actinolite 40Ar-40K isochron 74 AF 144-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.9916 65 638 5-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15338 1 638 38.3 muscovite conventional K-Ar 74 AF 145-1 "4.72E-04, 0.585E-04, 1.19E-04" 104.9 98 minimum age of metamorphic crystallization "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15338 2 634 25.4 muscovite conventional K-Ar 74 AF 145-1 "4.72E-04, 0.585E-04, 1.19E-04" 104.2 97 minimum age of metamorphic crystallization "PUBLISHED 10.539% K20 VALUE IS WRONG, 9.352% IS RIGHT--COMPILER" "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15338 3 636 38 muscovite 40Ar-40K isochron 74 AF 145-1 "4.72E-04, 0.585E-04, 1.19E-04" 104.9 98 636 minimum age of metamorphic crystallization 7-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15339 1 719 21.6 hornblende conventional K-Ar 74 AF 145-5 "4.72E-04, 0.585E-04, 1.19E-04" 9.576 96 age of metamorphic crystallization "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15339 2 636 38 hornblende 40Ar-40K isochron 74 AF 145-5 "4.72E-04, 0.585E-04, 1.19E-04" 9.576 96 636 minimum age of metamorphic crystallization 7-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15339 3 695 hornblende 40Ar-40K isochron 74 AF 145-5 "4.72E-04, 0.585E-04, 1.19E-04" 9.576 96 637 6-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15340 1 753 45.2 glaucophane-crossite conventional K-Ar 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.7119 79 age of metamorphic crystallization "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15340 2 758 45.5 glaucophane-crossite conventional K-Ar 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.7175 69 age of metamorphic crystallization "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15340 3 636 38 glaucophane-crossite 40Ar-40K isochron 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.7119 79 636 minimum age of metamorphic crystallization "7-POINT 40AR-40K ISOCHRON DESCRIBED BY TURNER, FORBES, AND MAYFIELD, 1978" 15340 4 695 glaucophane-crossite 40Ar-40K isochron 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.7119 79 637 "6-POINT 40AR-40K ISOCHRON DESCRIBED BY TURNER, FORBES, AND MAYFIELD, 1978" 15340 5 633 glaucophane-crossite 40Ar-40K isochron 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 0.7119 79 638 "5-POINT 40AR-40K ISOCHRON DESCRIBED BY TURNER, FORBES, AND MAYFIELD, 1978" 15341 1 196 5.9 paragonite conventional K-Ar 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 1.137 36 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15341 2 186 5.6 paragonite conventional K-Ar 74 AF 155-13 "4.72E-04, 0.585E-04, 1.19E-04" 1.08 19 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15342 1 651 39.1 actinolite conventional K-Ar 74 ATR 129.7 "4.72E-04, 0.585E-04, 1.19E-04" 1.009 61 age of metamorphic crystallization "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15342 2 636 38 actinolite 40Ar-40K isochron 74 ATR 129.7 "4.72E-04, 0.585E-04, 1.19E-04" 1.009 61 636 minimum age of metamorphic crystallization 7-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15342 3 695 actinolite 40Ar-40K isochron 74 ATR 129.7 "4.72E-04, 0.585E-04, 1.19E-04" 1.009 61 637 6-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15342 4 633 actinolite 40Ar-40K isochron 74 ATR 129.7 "4.72E-04, 0.585E-04, 1.19E-04" 1.009 61 638 5-POINT 40AR-40K ISOCHRON "THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15343 1 111 3.3 biotite conventional K-Ar 74 ATR 150.3 "4.72E-04, 0.585E-04, 1.19E-04" 14.99 94 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15343 2 111 3.3 muscovite conventional K-Ar 74 ATR 150.3 "4.72E-04, 0.585E-04, 1.19E-04" 17.62 79 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15344 1 427 29.9 actinolite conventional K-Ar 74 AWM 309 "4.72E-04, 0.585E-04, 1.19E-04" 0.5335 50 "REDUCED AGE; ARGON LOST DUE TO A CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15345 1 113 3.5 biotite conventional K-Ar 74 AWM 1535.3 "4.72E-04, 0.585E-04, 1.19E-04" 14.94 92 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15345 2 117 3.5 muscovite conventional K-Ar 74 AWM 1535.3 "4.72E-04, 0.585E-04, 1.19E-04" 18.83 94 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15346 1 93.6 2.8 biotite conventional K-Ar 74 PE 2B "4.72E-04, 0.585E-04, 1.19E-04" 13.3 90 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15346 2 104 3.1 muscovite conventional K-Ar 74 PE 2B "4.72E-04, 0.585E-04, 1.19E-04" 17.43 95 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15347 1 118 3.5 muscovite conventional K-Ar 74 PE 121 "4.72E-04, 0.585E-04, 1.19E-04" 13.63 87 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15348 1 100 3 biotite conventional K-Ar 75 AWM 3 "4.72E-04, 0.585E-04, 1.19E-04" 14.22 94 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15348 2 115 3.4 muscovite conventional K-Ar 75 AWM 3 "4.72E-04, 0.585E-04, 1.19E-04" 18.33 92 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15349 1 160 4.8 muscovite conventional K-Ar 75 AWM 1500 "4.72E-04, 0.585E-04, 1.19E-04" 26.6 89 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE IS REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15350 1 246.29 14.5 actinolite conventional K-Ar 74 AWM 1745.5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.262 0.9954 81 K20 VALUE IS AVERAGE OF 8 DETERMINATIONS RANGING FROM 0.250-0.280% "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15351 1 2534.06 510 glaucophane-crossite conventional K-Ar A-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.012 0.9581 45 K20 VALUE IS AVERAGE OF 6 DETERMINATIONS RANGING FROM 0.011-0.013% "SPURIOUS AGE--TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15351 2 2526.8 514 glaucophane-crossite conventional K-Ar A-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.012 0.953 67 K20 VALUE IS AVERAGE OF 6 DETERMINATIONS RANGING FROM 0.011-0.013% "SPURIOUS AGE--TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15351 3 2532.5 510 glaucophane-crossite conventional K-Ar A-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.012 0.957 63 K20 VALUE IS AVERAGE OF 6 DETERMINATIONS RANGING FROM 0.011-0.013% "SPURIOUS AGE--TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15351 4 234 7 paragonite conventional K-Ar A-1 CNM "4.72E-04, 0.585E-04, 1.19E-04" 1.586 32 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15352 1 1270 254 glaucophane-crossite conventional K-Ar A-2 "4.72E-04, 0.585E-04, 1.19E-04" 0.7501 84 "SPURIOUS AGE--TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15352 2 213 6 paragonite conventional K-Ar A-2 "4.72E-04, 0.585E-04, 1.19E-04" 1.837 48 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15353 1 1430 357 glaucophane-crossite conventional K-Ar A-3 "4.72E-04, 0.585E-04, 1.19E-04" 0.4741 77 "SPURIOUS AGE--TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15353 2 217 6.5 paragonite conventional K-Ar A-3 "4.72E-04, 0.585E-04, 1.19E-04" 2.175 78 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15354 1 117 3.5 muscovite conventional K-Ar 75 AWM 1501.1 "4.72E-04, 0.585E-04, 1.19E-04" 19.17 88 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15355 1 397.66 15.5 actinolite conventional K-Ar 75 AWM 1502 "4.72E-04, 0.585E-04, 1.19E-04*" 0.077 0.4932 38 K20 VALUE IS AVERAGE OF 8 DETERMINATIONS RANGING FROM 0.076-0.083% "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15356 1 106 3.2 muscovite conventional K-Ar 75 AWM 1503.1 "4.72E-04, 0.585E-04, 1.19E-04" 16.04 89 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15357 1 1330 133 glaucophane-crossite conventional K-Ar C-2 "4.72E-04, 0.585E-04, 1.19E-04" 1.26 87 "SPURIOUS AGE--TOO OLD. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15358 1 122 3.7 muscovite conventional K-Ar 66 ATR 39 "4.72E-04, 0.585E-04, 1.19E-04" 18.34 91 "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE PUBLISHED BY MAYFIELD, 1975, USGS PROF. PAPER 975, P. 64-65. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15359 1 108.5 3.3 muscovite conventional K-Ar 66 APA 131 "4.72E-04, 0.585E-04, 1.19E-04" 16.71 95 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE PUBLISHED BY MAYFIELD, 1975, USGS PROF. PAPER 975, P. 64-65. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND MAYFIELD, 1978" 15360 1 88 4 biotite conventional K-Ar 62 ABE 264 "4.72E-04, 0.585E-04, 1.19E-04" 8.85 94 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO PUBLISHED BY BROSGE AND REISER, 1971, USGS OPEN-FILE REPORT 479, AND BY TURNER, FORBES, AND MAYFIELD, 1978" 15360 2 92 5 muscovite conventional K-Ar 62 ABE 264 "4.72E-04, 0.585E-04, 1.19E-04" 10.3 96 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO PUBLISHED BY BROSGE AND REISER, 1971, USGS OPEN-FILE REPORT 479, AND BY TURNER, FORBES, AND MAYFIELD, 1978" 15361 1 86 4 biotite conventional K-Ar 62 ARR 192 "4.72E-04, 0.585E-04, 1.19E-04" 9.1 96 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO PUBLISHED BY BROSGE AND REISER, 1971, USGS OPEN-FILE REPORT 479, AND BY TURNER, FORBES, AND MAYFIELD, 1978" 15362 1 98.8 2.2 muscovite conventional K-Ar 60 ATR 134 "4.72E-04, 0.585E-04, 1.19E-04" 15.76 91 "AGE IS RELATED TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO PUBLISHED BY PESSEL, GARLAND, TAILLEUR, AND EAKINS, 1973, ALASKA STATE DIVISION OF GEOLOGICAL SURVEYS, OPEN-FILE REPORT 28, AND BY TURNER, FORBES, AND MAYFIELD, 1978" 15363 1 309.06 30.8 tremolite conventional K-Ar 55 ATR 109 "4.72E-04, 0.585E-04, 1.19E-04*" 0.03 0.1456 30 K20 VALUE IS THE AVERAGE OF 8 DETERMINATIONS RANGING FROM 0.025-0.032% "REDUCED AGE; ARGON LOST DUE TO CRETACEOUS THERMAL EVENT. THIS AGE ALSO REPORTED BY TURNER, FORBES, AND DILLON, 1979" 15364 1 57.8 1.7 biotite conventional K-Ar 1. (75ACY92) "4.962E-04, 0.581E-04, 1.1167E-04" 7.54 6.218 49 age of intrusion 15365 1 58.6 1.8 biotite conventional K-Ar 2. (75ACY146) "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 7.583 89 age of intrusion 15366 1 56.3 1.7 biotite conventional K-Ar 4. (75ACY2) "4.962E-04, 0.581E-04, 1.1167E-04" 8.68 6.97 78 age of intrusion 15367 1 58.6 1.8 biotite conventional K-Ar 6. (75ACY7) "4.962E-04, 0.581E-04, 1.1167E-04" 5.35 4.468 60 age of intrusion 15368 1 50.4 2 hornblende conventional K-Ar 7. (75ASJ520) "4.962E-04, 0.581E-04, 1.1167E-04" 0.555 0.4077 56 age of volcanism 15369 1 51.3 2.5 whole rock conventional K-Ar 8. (75ASJ521B) "4.962E-04, 0.581E-04, 1.1167E-04" 2.348 1.757 34 age of volcanism POTASSIUM VALUE IS AVERAGE OF 4 DETERMINATIONS 15370 1 144 4.3 biotite conventional K-Ar 9. (73ACY109) "4.962E-04, 0.581E-04, 1.1167E-04" 8.68 18.79 92 minimum age of intrusion 15370 2 154 4.6 hornblende conventional K-Ar 9.(73ACY109) "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 1.365 63 age of intrusion 15371 1 54.8 1.6 biotite conventional K-Ar 12. (73ACY101) "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 6.783 83 age of intrusion 15372 1 56.3 2.5 whole rock conventional K-Ar 13. (75ASJ526) "4.962E-04, 0.581E-04, 1.1167E-04" 0.843 0.6942 31 age of volcanism 15373 1 143 4.3 biotite conventional K-Ar 14. (62AE4) "4.962E-04, 0.581E-04, 1.1167E-04" 6.21 13.33 91 age of intrusion 15373 2 146 4.4 muscovite conventional K-Ar 14. (62AE4) "4.962E-04, 0.581E-04, 1.1167E-04" 9.77 21.49 92 age of intrusion 15374 1 61.7 1.9 biotite conventional K-Ar 20. (73ACY95) "4.962E-04, 0.581E-04, 1.1167E-04" 9.64 8.705 94 age not evaluated 15374 2 71.3 2.1 hornblende conventional K-Ar 20. (73ACY95) "4.962E-04, 0.581E-04, 1.1167E-04" 1.024 1.071 88 age not evaluated 15375 1 67.8 2 biotite conventional K-Ar 21. (73ACY114) "4.962E-04, 0.581E-04, 1.1167E-04" 9.7 9.643 88 A REDUCED AGE; INTRUSIVE IS JURASSIC IN AGE 15376 1 135 4 muscovite conventional K-Ar 22. (73ACY115) "4.962E-04, 0.581E-04, 1.1167E-04" 9.91 19.98 93 A REDUCED AGE; PLUTON IS AROUND 145 M.Y. OLD 15376 2 99.4 3 biotite conventional K-Ar 22. (73ACY115) "4.962E-04, 0.581E-04, 1.1167E-04" 9.62 14.16 97 REDUCED AGE; PLUTON IS AROUND 145 M.Y. OLD 15377 1 61.7 1.9 biotite conventional K-Ar 23. (73ACY94) "4.962E-04, 0.581E-04, 1.1167E-04" 9.46 8.593 81 age of intrusion 15377 2 61 1.8 hornblende conventional K-Ar 23. (73ACY94) "4.962E-04, 0.581E-04, 1.1167E-04" 0.97 0.8669 71 age of intrusion 15378 1 67.2 2 muscovite conventional K-Ar 24. (75ACY135) "4.962E-04, 0.581E-04, 1.1167E-04" 10.64 10.21 72 age of intrusion 15378 2 65 2 biotite conventional K-Ar 24. (75ACY135) "4.962E-04, 0.581E-04, 1.1167E-04" 9.68 9.025 67 age of intrusion 15379 1 67.4 2 biotite conventional K-Ar 25. (73ACY97) "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 8.594 83 age of intrusion 15379 2 71.8 2.2 hornblende conventional K-Ar 25. (73ACY97) "4.962E-04, 0.581E-04, 1.1167E-04" 0.918 0.9669 72 age of intrusion 15380 1 129 3.9 muscovite conventional K-Ar 26. (74ACY146) "4.962E-04, 0.581E-04, 1.1167E-04" 3.46 6.68 69 REDUCED AGE; PLUTON IS AROUND 145 M.Y. OLD 15381 1 168 5 biotite conventional K-Ar 27. (74ACY149) "4.962E-04, 0.581E-04, 1.1167E-04" 8.06 20.44 89 age of intrusion 15382 1 73.1 2.2 hornblende conventional K-Ar 28. (60ACZ40) "4.962E-04, 0.581E-04, 1.1167E-04" 0.759 0.8153 74 age of intrusion 15383 1 69 2.1 biotite conventional K-Ar 29. (66ACZW2) "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 8.711 89 age of intrusion 15383 2 73.3 2.2 hornblende conventional K-Ar 29. (66ACZW2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 0.9475 86 age of intrusion 15384 1 72 2.2 biotite conventional K-Ar 30. (66ACZW4) "4.962E-04, 0.581E-04, 1.1167E-04" 7.22 7.624 91 age of intrusion 15384 2 74.4 2.2 hornblende conventional K-Ar 30. (66ACZW4) "4.962E-04, 0.581E-04, 1.1167E-04" 0.492 0.5374 41 age of intrusion 15385 1 134 4 muscovite conventional K-Ar 31. (74ACY151) "4.962E-04, 0.581E-04, 1.1167E-04" 10.58 21.23 95 A REDUCED AGE; PLUTON IS AROUND 145 M.Y. OLD 15386 1 88.9 4.4 actinolite conventional K-Ar 32. (73ACY17) "4.962E-04, 0.581E-04, 1.1167E-04" 0.032 0.0419 6 minimum age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION 15387 1 59 1.8 muscovite conventional K-Ar 33. (73ACY85) "4.962E-04, 0.581E-04, 1.1167E-04" 8.34 7.189 85 A REDUCED AGE 15388 1 65.9 3 muscovite conventional K-Ar 34. (73ACY27) "4.962E-04, 0.581E-04, 1.1167E-04" 8.86 8.554 89 A REDUCED AGE 15389 1 59.6 1.8 muscovite conventional K-Ar 35. (73ACY11A) "4.962E-04, 0.581E-04, 1.1167E-04" 9.1 7.928 84 A REDUCED AGE 15390 1 91 4.6 actinolite conventional K-Ar 36. (74ASJ100A) "4.962E-04, 0.581E-04, 1.1167E-04" 0.029 0.039 10 minimum age of intrusion POTASSIUM DETERMINED BY ISOTOPE DILUTION 15391 1 67.5 2.4 biotite conventional K-Ar 37. (76ACY19) "4.962E-04, 0.581E-04, 1.1167E-04" 1.078 1.067 45 age of metamorphic crystallization 15392 1 83.4 2.2 biotite conventional K-Ar 1. (66APA129) "4.72E-04, 0.585E-04, 1.19E-04" 8.876 94 age of volcanism 15393 1 107 2.8 biotite conventional K-Ar 2. (66AMM110) "4.72E-04, 0.585E-04, 1.19E-04" 15.02 84 minimum age of intrusion 15394 1 110 3 biotite conventional K-Ar 3. (66AMM126) "4.72E-04, 0.585E-04, 1.19E-04" 13.96 92 minimum age of metamorphic crystallization 15395 1 81.5 3 hornblende conventional K-Ar 63APA216 "4.72E-04, 0.585E-04, 1.19E-04" 0.7003 46 age of intrusion 15396 1 81.9 3 hornblende conventional K-Ar 63APA229 "4.72E-04, 0.585E-04, 1.19E-04" 0.836 73 age of intrusion 15397 1 80.6 2 biotite conventional K-Ar 64APA96 "4.72E-04, 0.585E-04, 1.19E-04" 9.065 94 age of intrusion 15398 1 99.4 2.4 biotite conventional K-Ar 64APA92 "4.72E-04, 0.585E-04, 1.19E-04" 13.32 95 age of intrusion 15399 1 98.6 2.9 biotite conventional K-Ar 64APA95 "4.72E-04, 0.585E-04, 1.19E-04" 10.33 92 age of intrusion 15400 1 103.32 5 hornblende conventional K-Ar 61APA118 "4.72E-04, 0.585E-04, 1.19E-04*" 1.36 2.082 77 age of intrusion 15401 1 17.7 1 natroalunite conventional K-Ar M48B "4.962E-04, 0.581E-04, 1.1167E-04" 1.116 28 TIME OF FORMATION 15402 1 13.9 0.9 natroalunite conventional K-Ar M682 "4.962E-04, 0.581E-04, 1.1167E-04" 0.172 31 TIME OF FORMATION 15403 1 12.6 2.5 natroalunite conventional K-Ar M778 "4.962E-04, 0.581E-04, 1.1167E-04" 0.546 10 TIME OF FORMATION 15404 1 23.2 1.2 alunite conventional K-Ar M804 "4.962E-04, 0.581E-04, 1.1167E-04" 1.582 68 TIME OF FORMATION 15405 1 61 1 biotite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.82 7.7917 87 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15406 1 63.2 1 biotite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.91 8.1586 87 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15407 1 61.1 1 biotite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.53 7.5556 88 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15408 1 61.7 0.7 biotite conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.38 8.4747 93 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15409 1 59.9 0.7 biotite conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6305 71 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15410 1 61 0.7 biotite conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 8.3526 76 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15411 1 59.2 0.7 biotite conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 7.7796 71 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15412 1 61.9 0.7 biotite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 8.0594 59 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15413 1 64.4 0.7 biotite conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6417 69 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15414 1 57.8 0.7 biotite conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 7.9524 73 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15415 1 61.2 0.7 biotite conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6551 68 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15416 1 59.9 0.6 biotite conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 8.1572 75 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15417 1 55.7 0.7 biotite conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 7.9159 64 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15418 1 61 0.5 biotite conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 8.85 7.8995 95 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15419 1 59.9 0.7 biotite conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 8.1531 68 ROCK PROBABLY FORMED 60-65 M.Y. AGO 15420 1 63.6 0.7 biotite conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7996 71 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15421 1 63 0.7 biotite conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 8.5543 72 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15422 1 67.9 1 biotite conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 9.2 8.9417 94 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15423 1 65.1 0.7 biotite conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 9.4421 59 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15424 1 62.1 0.6 biotite conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 9.23 8.4 96 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15425 1 59.7 0.7 biotite conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 7.6554 62 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS. TIME OF MINERALIZATION 15426 1 58.5 0.7 biotite conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 7.4159 74 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS. TIME OF MINERALIZATION 15427 1 61.9 0.9 muscovite conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5791 60 TIME OF MINERALIZATION 15428 1 60.8 0.7 muscovite conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5764 75 TIME OF MINERALIZATION 15429 1 61 0.6 muscovite conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5201 73 TIME OF MINERALIZATION 15430 1 61.8 0.7 muscovite conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 9.6979 70 TIME OF MINERALIZATION 15431 1 62.4 0.7 muscovite conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 9.791 77 TIME OF MINERALIZATION 15432 1 60.5 0.7 muscovite conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 9.4319 71 TIME OF MINERALIZATION 15433 1 59.5 0.9 muscovite conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 9.3088 66 TIME OF MINERALIZATION 15434 1 63 0.7 muscovite conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" 9.3843 74 TIME OF MINERALIZATION 15435 1 61.1 0.6 muscovite conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 9.4989 76 TIME OF MINERALIZATION 15436 1 64.2 0.8 muscovite conventional K-Ar 32 "4.962E-04, 0.581E-04, 1.1167E-04" 9.6896 74 TIME OF MINERALIZATION 15437 1 57.3 0.7 biotite conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 7.3648 67 TIME OF FORMATION 15438 1 821 50 hornblende conventional K-Ar 34 "4.962E-04, 0.581E-04, 1.1167E-04" 7.5243 33 MAY BE A REDUCED AGE 15439 1 994 10 biotite conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 141.296 47 MAY BE A REDUCED AGE 15440 1 1079 39 biotite conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 7.52 157.505 98 minimum age of intrusion 15441 1 66.1 1 biotite conventional K-Ar 38 "4.962E-04, 0.581E-04, 1.1167E-04" 8.72 8.3613 88 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15442 1 1106 10 biotite conventional K-Ar 39 "4.962E-04, 0.581E-04, 1.1167E-04" 203.816 97 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15443 1 920 9 biotite conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 155.235 96 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15444 1 914 9 biotite conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 147.782 96 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15445 1 60.9 0.7 biotite conventional K-Ar 42 "4.962E-04, 0.581E-04, 1.1167E-04" 8.4456 73 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15446 1 361 4 biotite conventional K-Ar 43 "4.962E-04, 0.581E-04, 1.1167E-04" 53.596 94 PRECAMBRIAN AGE HAS BEEN RESET BY LATE CRETACEOUS-PALEOCENE THERMAL EVENTS 15447 1 1422 14 biotite conventional K-Ar 44 "4.962E-04, 0.581E-04, 1.1167E-04" 286.666 96 age of intrusion 15448 1 119.8 1 biotite conventional K-Ar 45 "4.962E-04, 0.581E-04, 1.1167E-04" 8.57 15.278 97 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15449 1 57.2 0.6 biotite conventional K-Ar 46 "4.962E-04, 0.581E-04, 1.1167E-04" 7.96 6.5884 67 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15450 1 759 8 biotite conventional K-Ar 47 "4.962E-04, 0.581E-04, 1.1167E-04" 103.775 95 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15451 1 90 5 biotite conventional K-Ar 48 "4.962E-04, 0.581E-04, 1.1167E-04" 11.976 11 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15452 1 683 7 biotite conventional K-Ar 49 "4.962E-04, 0.581E-04, 1.1167E-04" 85.923 85 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15453 1 129.2 1.3 biotite conventional K-Ar 50 "4.962E-04, 0.581E-04, 1.1167E-04" 17.234 68 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15454 1 1870 12 biotite conventional K-Ar 51 "4.962E-04, 0.581E-04, 1.1167E-04" 419.112 97 AGE MAY BE A PRIMARY AGE; AGE IS AT LEAST AROUND 1600 M.Y. 15455 1 71.3 3 biotite conventional K-Ar 52 "4.962E-04, 0.581E-04, 1.1167E-04" 9.5098 18 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15456 1 234.6 2.3 biotite conventional K-Ar 53 "4.962E-04, 0.581E-04, 1.1167E-04" 30.731 69 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15457 1 521 5 biotite conventional K-Ar 54 "4.962E-04, 0.581E-04, 1.1167E-04" 9.01 77.336 96 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15458 1 799 8 biotite conventional K-Ar 55 "4.962E-04, 0.581E-04, 1.1167E-04" 133.507 92 RESET AGE; PLUTON IS AROUND 1600 M.Y. OLD 15459 1 1271 12 muscovite conventional K-Ar 56 "4.962E-04, 0.581E-04, 1.1167E-04" 272.065 98 minimum age of intrusion 15460 1 1072 10 biotite conventional K-Ar 57 "4.962E-04, 0.581E-04, 1.1167E-04" 200.776 95 PROBABLY A RESET AGE 15461 1 820.5 8 biotite conventional K-Ar 58 "4.962E-04, 0.581E-04, 1.1167E-04" 136.256 97 RESET AGE; ROCK IS PROBABLY AROUND 1650 M.Y. OLD 15462 1 619 6 muscovite conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 10.36 108.613 99 RESET AGE; ROCK IS PRECAMBRIAN BUT PRIMARY AGE IS NOT KNOWN 15463 1 71.7 2 muscovite conventional K-Ar 60 "4.962E-04, 0.581E-04, 1.1167E-04" 10.14 10.6 89 RESET AGE; ROCK IS PRECAMBRIAN BUT PRIMARY AGE IS NOT KNOWN 15463 2 62.3 1 biotite conventional K-Ar 61 "4.962E-04, 0.581E-04, 1.1167E-04" 9.05 8.1625 89 RESET AGE; ROCK IS PRECAMBRIAN BUT PRIMARY AGE IS NOT KNOWN 15464 1 160.1 biotite conventional K-Ar 1B (59AGZM26) "4.76E-04, 0.589E-04, 1.18E-04*" 4.09 9.858 10 BATHOLITH IS 160-165 M.Y. OLD 15466 1 174.08 biotite conventional K-Ar 3. (59AGZM58) "4.76E-04, 0.589E-04, 1.18E-04*" 6.75 17.76 11 BATHOLITH IS 160-165 M.Y. OLD 15467 1 163.53 biotite conventional K-Ar 4. (59AGZM25-I) "4.76E-04, 0.589E-04, 1.18E-04*" 3.99 9.833 10 PROBABLY IMPURE BIOTITE CONCENTRATE--COMPILER BOULDER PROBABLY FORMED 160 M.Y. AGO 15468 1 159.33 biotite conventional K-Ar 5. (59AGZM25-II) "4.76E-04, 0.589E-04, 1.18E-04*" 5.75 13.79 10 BOULDER PROBABLY FORMED 160-165 YEARS AGO 15469 1 162.63 biotite conventional K-Ar 6. (59AGZM25-III) "4.76E-04, 0.589E-04, 1.18E-04*" 2.41 5.905 10 PROBABLY AN IMPURE BIOTITE CONCENTRATE PROBABLE AGE OF THE BOULDER 15470 1 160 6 biotite conventional K-Ar 62ALE1 "4.72E-04, 0.585E-04, 1.19E-04" 21.56 40AR-RAD. VALUE IS AVERAGE OF 9 DETERMINATIONS BATHOLITH FORMED ABOUT 70 M.Y. AGO 15470 2 168 6 hornblende conventional K-Ar 62ALE1 "4.72E-04, 0.585E-04, 1.19E-04" 2.469 77 age of intrusion 15471 1 170 6 biotite conventional K-Ar 62ALE5 "4.72E-04, 0.585E-04, 1.19E-04" 14.75 68 age of intrusion 15471 2 168 6 hornblende conventional K-Ar 62ALE5 "4.72E-04, 0.585E-04, 1.19E-04" 1.229 58 age of intrusion 15472 1 153 6 biotite conventional K-Ar 62ALEBE "4.72E-04, 0.585E-04, 1.19E-04" 13.43 83 minimum age of intrusion BOULDER MAY BE FROM THE 70 M.Y. OLD BATHOLITH 15472 2 156 6 hornblende conventional K-Ar 62ALEBE "4.72E-04, 0.585E-04, 1.19E-04" 1.708 74 minimum age of intrusion BOULDER MAY BE FROM THE 70 M.Y. OLD BATHOLITH 15473 1 166 6 biotite conventional K-Ar 59AGZ-M26 "4.72E-04, 0.585E-04, 1.19E-04" 11.12 82 age of intrusion "PREVIOUS DETERMINATIONS FOR THIS BIOTITE GAVE 169 AND 157 M.Y.--GRANTZ AND OTHERS, 1963" 15473 2 159 6 hornblende conventional K-Ar 59AGZ-M26 "4.72E-04, 0.585E-04, 1.19E-04" 1.227 68 minimum age of intrusion 15473 3 159 6 hornblende conventional K-Ar 59AGZ-M26 "4.72E-04, 0.585E-04, 1.19E-04" 1.225 77 minimum age of intrusion 15474 1 163 6 hornblende conventional K-Ar 59AGZ-M58 "4.72E-04, 0.585E-04, 1.19E-04" 0.7627 69 minimum age of intrusion "A K-AR BIOTITE AGE OF 170 M.Y. WAS REPORTED BY GRANTZ AND OTHERS, 1963" 15491 1 65.2 3.9 hornblende conventional K-Ar 1. 80AMI 12B "4.962E-04, 0.581E-04, 1.1167E-04" 0.6392 3529 age of volcanism 40AR-RAD=0.6920 AND 0.5865XE-10 MOL/GM 15492 1 154 6 biotite conventional K-Ar 2. 80APA 15A "4.962E-04, 0.581E-04, 1.1167E-04" 10.44 7679 minimum age of intrusion 40AR-RAD=10.33 AND 10.55XE-10 MOL/GM 15493 1 166 7 biotite conventional K-Ar 3. 80AML 25 "4.962E-04, 0.581E-04, 1.1167E-04" 5.818 7068 minimum age of intrusion MAY BE AN IMPURE BIOTITE CONCENTRATE 40AR-RAD=5.645 AND 5.990XE-10 MOL/GM 15493 2 173 9 hornblende conventional K-Ar 3. 80AML 25 "4.962E-04, 0.581E-04, 1.1167E-04" 1.7295 6242 age of intrusion 40AR-RAD=1.730 AND 1.729XE-10 MOL/GM 15494 1 134 4 muscovite conventional K-Ar 1. 79APA 551 "4.962E-04, 0.581E-04, 1.1167E-04" 9.895 19.85 89 RESET AGE; ISOTOPIC SYSTEMS AFFECTED BY CRETACEOUS THERMAL EVENTS 15495 1 136 4.1 muscovite conventional K-Ar 2. 79APA 526 "4.962E-04, 0.581E-04, 1.1167E-04" 8.805 17.96 91 RESET AGE; ISOTOPIC SYSTEMS AFFECTED BY CRETACEOUS THERMAL EVENTS 15496 1 151 4.5 hornblende conventional K-Ar 3. 79APA 552A "4.962E-04, 0.581E-04, 1.1167E-04" 0.27 0.6106 55 age of intrusion 15497 1 172 5.2 hornblende conventional K-Ar 4. 79APA 525A "4.962E-04, 0.581E-04, 1.1167E-04" 0.12 0.3111 29 age of metamorphic crystallization 15498 1 269 8 hornblende conventional K-Ar 5. 79APA 521C "4.962E-04, 0.581E-04, 1.1167E-04" 0.214 0.8954 56 "A SPURIOUS AGE, PROBABLY; DIKE IS PROBABLY JURASSIC IN AGE" 15499 1 112 3.4 biotite conventional K-Ar 6. 79APA 548 "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 15.62 85 age of intrusion 15500 1 121 3.8 hornblende conventional K-Ar 1. 65APA44 "4.72E-04, 0.585E-04, 1.19E-04" 1.39 93 age of intrusion "TURNER, FORBES, AND DILLON, 1979, ALSO REPORT THIS AGE BUT THOUGHT IT WAS A REDUCED AGE. THEY ALSO PUBLISHED SAMPLE NUMBER AS 66APA44" 15501 1 85.2 2.2 biotite conventional K-Ar 2. 65APA91 "4.72E-04, 0.585E-04, 1.19E-04" 9.511 91 age of volcanism 15502 1 122 3 hornblende conventional K-Ar 3. 65AMM143 "4.72E-04, 0.585E-04, 1.19E-04" 0.9036 76 age of intrusion 15503 1 117 4.3 hornblende conventional K-Ar 4. 65APA52A "4.72E-04, 0.585E-04, 1.19E-04" 0.4847 67 age of intrusion 15504 1 125 3.3 hornblende conventional K-Ar 5. 66APA7 "4.72E-04, 0.585E-04, 1.19E-04" 1.919 90 age of intrusion 15505 1 155 6 plagioclase conventional K-Ar 63ABE202 "4.72E-04, 0.585E-04, 1.19E-04" 2.677 69 minimum age of intrusion PARTLY ALTERED PLAGIOCLASE (CHLORITE AND ILLITE) 15506 1 168 8 hornblende conventional K-Ar 63ARR151 "4.72E-04, 0.585E-04, 1.19E-04" 0.6503 51 minimum age of intrusion 15511 1 5.5 0.16 biotite conventional K-Ar 116B "4.72E-04, 0.585E-04, 1.19E-04*" 7.841 0.622 27 age of volcanism K=6.509% 15512 1 5.6 0.11 biotite conventional K-Ar 117B "4.72E-04, 0.585E-04, 1.19E-04*" 8.332 0.6733 48 age of volcanism K=6.916% 15513 1 6.48 0.13 biotite conventional K-Ar 113B "4.72E-04, 0.585E-04, 1.19E-04*" 8.64 0.8071 58 age of volcanism K=7.172% 15514 1 6.5 0.13 biotite conventional K-Ar 114B "4.72E-04, 0.585E-04, 1.19E-04*" 8.021 0.752 54 age of volcanism K=6.658% 15515 1 6.65 0.13 biotite conventional K-Ar 115B "4.72E-04, 0.585E-04, 1.19E-04*" 8.874 0.8515 50 age of volcanism K=7.366% 15516 1 8.4 0.16 biotite conventional K-Ar 119B "4.72E-04, 0.585E-04, 1.19E-04*" 8.419 1.0205 49 age of volcanism K=6.989% 15517 1 7.78 0.3 whole rock conventional K-Ar 121W/R "4.72E-04, 0.585E-04, 1.19E-04*" 1.055 0.1185 22 minimum age of volcanism K=0.876% 15518 1 7.97 0.15 biotite conventional K-Ar 124B "4.72E-04, 0.585E-04, 1.19E-04*" 7.977 0.9169 55 age of volcanism K=6.622% 15519 1 8.22 0.16 biotite conventional K-Ar 125B "4.72E-04, 0.585E-04, 1.19E-04*" 8.16 0.9681 52 age of volcanism K=6.774% 15520 1 94 1.9 hornblende conventional K-Ar 1 SKAR12 "4.962E-04, 0.581E-04, 1.1167E-04" 1.055 1.465 82 age of uplift and cooling K=0.876% 15520 2 88.8 2 biotite conventional K-Ar 1 SKAR13 "4.962E-04, 0.581E-04, 1.1167E-04" 9.181 12.02 83 age of uplift and cooling K=7.621% 15521 1 92.2 1.3 hornblende conventional K-Ar 2 SKAR18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.963 1.311 87 age of uplift and cooling K=0.799% 15521 2 89.4 1.3 biotite conventional K-Ar 2 SKAR11 "4.962E-04, 0.581E-04, 1.1167E-04" 9.228 12.17 88 age of uplift and cooling K=7.660% 15522 1 93.5 1.5 biotite conventional K-Ar 3 SKAR27 "4.962E-04, 0.581E-04, 1.1167E-04" 8.8 12.16 94 age of uplift and cooling K=7.305% 15523 1 91.2 2.6 hornblende conventional K-Ar 4 SKAR25 "4.962E-04, 0.581E-04, 1.1167E-04" 1.832 2.466 43 K=1.521% PROBABLY A RESET AGE 15523 2 82.7 1.4 biotite conventional K-Ar 4 SKAR24 "4.962E-04, 0.581E-04, 1.1167E-04" 8.264 10.06 98 K=6.860% PROBABLY A RESET AGE 15524 1 82.8 1.8 biotite conventional K-Ar 5 SKAR30 "4.962E-04, 0.581E-04, 1.1167E-04" 8.372 10.21 95 K=6.950% A RESET AGE 15525 1 82.8 1.7 hornblende conventional K-Ar 6 SKAR17 "4.962E-04, 0.581E-04, 1.1167E-04" 2.119 2.585 86 K=1.759% PROBABLY A RESET AGE 15525 2 82.5 1.3 biotite conventional K-Ar 6 SKAR16 "4.962E-04, 0.581E-04, 1.1167E-04" 8.651 10.51 90 K=7.181% PROBABLY A RESET AGE 15526 1 89.5 1.2 hornblende conventional K-Ar 7 SKAR14 "4.962E-04, 0.581E-04, 1.1167E-04" 1.942 2.563 91 K=1.612% A RESET AGE 15526 2 86 1.4 biotite conventional K-Ar 7 SKAR15 "4.962E-04, 0.581E-04, 1.1167E-04" 7.121 9.026 89 K=5.911% A RESET AGE 15527 1 5.64 0.23 anorthoclase conventional K-Ar ID/BE-10C "4.962E-04, 0.581E-04, 1.1167E-04" 9.47 0.7699 47 age of volcanism K=7.86% "THIS AGE ALSO REPORTED BY EVANS AND BROWN, 1981" 15528 1 4.77 0.29 sanidine conventional K-Ar ID/BE-21A "4.962E-04, 0.581E-04, 1.1167E-04" 7.46 0.5123 25 age of volcanism K=6.19% "THIS AGE ALSO REPORTED BY EVANS AND BROWN, 1981" 15529 1 5.81 0.69 anorthoclase conventional K-Ar ID/BE-115 "4.962E-04, 0.581E-04, 1.1167E-04" 5.52 0.4626 12 age of volcanism K=4.58% "THIS AGE ALSO REPORTED BY EVANS AND BROWN, 1981" 15530 1 29.6 1.4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 2.272 0.98 age of volcanism K=1.886% 15539 1 165 3 hornblende conventional K-Ar PP580 "4.962E-04, 0.581E-04, 1.1167E-04" 0.1667 0.4147 43 age of metamorphic crystallization K=0.1384% 15540 1 147 6 hornblende conventional K-Ar K20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.3006 0.6605 51 minimum age of intrusion K=0.2495% 15541 1 127 6 hornblende conventional K-Ar D26 "4.962E-04, 0.581E-04, 1.1167E-04" 0.6134 1.164 50 minimum age of intrusion K=0.5092% 15566 1 11.4 0.2 whole rock conventional K-Ar KSW-317 "4.962E-04, 0.581E-04, 1.1167E-04" 2.252 0.37 49 age of volcanism 15566 2 11.6 0.2 whole rock conventional K-Ar KSW-317 "4.962E-04, 0.581E-04, 1.1167E-04" 2.252 0.3786 50 age of volcanism 15567 1 12 0.3 whole rock conventional K-Ar KSW-413 "4.962E-04, 0.581E-04, 1.1167E-04" 1.508 0.2593 82 age of volcanism 15568 1 12.7 0.3 whole rock conventional K-Ar KSW-392 "4.962E-04, 0.581E-04, 1.1167E-04" 0.297 0.0553 76 age of volcanism 15569 1 13.4 0.3 sanidine conventional K-Ar KSW-412 "4.962E-04, 0.581E-04, 1.1167E-04" 9.57 1.0823 80 age of volcanism 15570 1 12.5 0.2 glass conventional K-Ar KSW-284 "4.962E-04, 0.581E-04, 1.1167E-04" 4.76 0.8627 70 minimum age of volcanism GLASS IS HYDRATED--RADIOGENIC ARGON LOST--AGE REDUCED 15571 1 13.3 0.2 sanidine conventional K-Ar KSW-352 "4.962E-04, 0.581E-04, 1.1167E-04" 8.84 1.6743 86 age of volcanism 15572 1 13.4 0.3 sanidine conventional K-Ar KSW-347 "4.962E-04, 0.581E-04, 1.1167E-04" 10.02 1.9146 46 age of volcanism 15573 1 13.3 0.3 whole rock conventional K-Ar KSW-365 "4.962E-04, 0.581E-04, 1.1167E-04" 2.383 0.4524 51 age of volcanism 15574 1 13.5 0.4 whole rock conventional K-Ar KSW-364 "4.962E-04, 0.581E-04, 1.1167E-04" 3.575 0.6913 76 age of volcanism 15575 1 13.8 0.3 sanidine conventional K-Ar KSW-367 "4.962E-04, 0.581E-04, 1.1167E-04" 7.81 1.0538 59 minimum age of volcanism 15576 1 14.4 0.3 sanidine conventional K-Ar KSW-368 "4.962E-04, 0.581E-04, 1.1167E-04" 7.87 1.5824 79 age of volcanism 15577 1 13.9 0.2 sanidine conventional K-Ar KSW-330 "4.962E-04, 0.581E-04, 1.1167E-04" 6.6 1.3134 95 age of volcanism 15578 1 14.1 0.3 sanidine conventional K-Ar KSW-361 "4.962E-04, 0.581E-04, 1.1167E-04" 5.62 1.1308 71 age of volcanism 15579 1 14.1 0.2 anorthoclase conventional K-Ar KSW-298 "4.962E-04, 0.581E-04, 1.1167E-04" 4.99 1.015 88 age of volcanism "ALSO CALLED ""SANIDINE""" 15580 1 14.1 0.2 sanidine conventional K-Ar KSW-206 "4.962E-04, 0.581E-04, 1.1167E-04" 7.21 1.4564 94 age of volcanism 15581 1 14 0.2 sanidine conventional K-Ar KSW-198 "4.962E-04, 0.581E-04, 1.1167E-04" 7.09 1.4134 76 age of volcanism 15582 1 14.2 0.2 sanidine conventional K-Ar KSW-246 "4.962E-04, 0.581E-04, 1.1167E-04" 7.14 1.4952 97 age of volcanism 15583 1 13.6 0.2 sanidine conventional K-Ar KSW-301 "4.962E-04, 0.581E-04, 1.1167E-04" 7.14 1.2291 82 age of volcanism 15584 1 14.2 0.2 sanidine conventional K-Ar KSW-268 "4.962E-04, 0.581E-04, 1.1167E-04" 6.9 1.3915 38 age of volcanism 15585 1 14.7 0.2 sanidine conventional K-Ar KSW-240 "4.962E-04, 0.581E-04, 1.1167E-04" 7.65 1.6124 88 age of volcanism 15586 1 15.5 0.2 sanidine conventional K-Ar KSW-29 "4.962E-04, 0.581E-04, 1.1167E-04" 6.2 1.3906 97 age of volcanism 15586 2 15.8 0.2 sanidine conventional K-Ar KSW-29 "4.962E-04, 0.581E-04, 1.1167E-04" 6.2 1.4 94 age of volcanism 15587 1 15.6 0.4 whole rock conventional K-Ar KSW-370 "4.962E-04, 0.581E-04, 1.1167E-04" 1.858 0.418 65 age of volcanism 15588 1 191 8 plagioclase conventional K-Ar N.J. L-10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.428 age of volcanism PLAGIOCLASE ETCHED WITH HNO3 ACID 15589 1 190 7 plagioclase conventional K-Ar N.J. L-20 "4.962E-04, 0.581E-04, 1.1167E-04" 1.285 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 194 M.Y. AGO; AVERAGE OF 5 DATES 15589 2 191 8 plagioclase conventional K-Ar N.J. L-20 "4.962E-04, 0.581E-04, 1.1167E-04" 1.294 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 194 M.Y. AGO; AVERAGE OF 5 DATES 15589 3 198 8 plagioclase conventional K-Ar N.J. L-20 "4.962E-04, 0.581E-04, 1.1167E-04" 1.343 PLAGIOCLASE ETCHED IN HNO3 ACID FLOW FORMED 194 M.Y. AGO; AVERAGE OF 5 DATES 15590 1 197 8 plagioclase conventional K-Ar N.J. L-21 "4.962E-04, 0.581E-04, 1.1167E-04" 2.186 PLAGIOCLASE ETCHED IN HNO3 ACID FLOW FORMED 194 M.Y. AGO; AVERAGE OF 5 DATES 15590 2 194 12 plagioclase conventional K-Ar N.J. L-21 "4.962E-04, 0.581E-04, 1.1167E-04" 2.151 PLAGIOCLASE ETCHED IN HNO3 ACID FLOW FORMED 194 M.Y. AGO; AVERAGE OF 5 DATES 15591 1 185 20 plagioclase conventional K-Ar N.J. L-31 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5354 PLAGIOCLASE ETCHED IN HNO3 ACID FLOW FORMED 185 M.Y. AGO; AVERAGE OF 4 DATES 15591 2 190 8 plagioclase conventional K-Ar N.J. L-31 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5533 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 185 M.Y. AGO; AVERAGE OF 4 DATES 15592 1 185 11 plagioclase conventional K-Ar N.J. L-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.6425 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 185 M.Y. AGO; AVERAGE OF 4 DATES 15592 2 181 9 plagioclase conventional K-Ar N.J. L-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.6291 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 185 M.Y. AGO; AVERAGE OF 4 DATES 15593 1 186 8 plagioclase CT L-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.365 1.022 age of volcanism PLAGIOCLASE ETCHED IN HNO3 ACID 15593 2 186 3 whole rock conventional K-Ar CT C-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.363 1.013 minimum age of volcanism CALCULATED AGE IS AVERAGE OF 10 WHOLE-ROCK DETERMINATIONS 15593 3 187 10 whole rock 39Ar-40Ar incremental (plateau) CT-L11 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism FIRST STEP OF 40-39AR ANALYSIS GAVE AGE OF 166+/-11 M.Y. SEE ARTICLE FOR ANALYTICAL DATA FOR 40-39AR ANALYSIS 15594 1 230 15 plagioclase conventional K-Ar CT L-30 "4.962E-04, 0.581E-04, 1.1167E-04" 1.646 "PLAGIOCLASE ETCHED WITH HNO3 ACID, ABUNDANT SERICITE FOUND IN PLAGIOCLASE" SPURIOUS AGE; EXCESS ARGON PROBABLY PRESENT; ARGON INTRODUCED BY HYDROTHERMAL SOLUTIONS 15594 2 231 18 plagioclase conventional K-Ar CT L-30 "4.962E-04, 0.581E-04, 1.1167E-04" 1.651 "PLAGIOCLASE ETCHED BY HNO3 ACID, ABUNDANT SERICITE FOUND IN PLAGIOCLASE" SPURIOUS AGE; EXCESS ARGON PROBABLY PRESENT; ARGON INTRODUCED BY HYDROTHERMAL SOLUTIONS 15594 3 279 14 whole rock conventional K-Ar CT-L30 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7719 SPURIOUS AGE; EXCESS ARGON PROBABLY PRESENT; ARGON INTRODUCED BY HYDROTHERMAL SOLUTIONS 15595 1 191 7 plagioclase conventional K-Ar CT L-20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7764 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 189 M.Y. AGO; AVERAGE OF 2 DATES 15596 1 186 7 plagioclase conventional K-Ar MA L-20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.937 PLAGIOCLASE ETCHED WITH HNO3 ACID FLOW FORMED 189 M.Y. AGO; AVERAGE OF 2 DATES 15597 1 205 4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" "40AR-RAD=2.793, 2.865, 2.887, 2.918XE-10 MOL/GM; CALCULATED AGE IS AVERAGE OF 200, 205, 206, AND 208 M.Y. DATES" AGE IS APPARENTLY SLIGHTLY OLD; FLOW PROBABLY FORMED 195-200 M.Y. AGO 15598 1 183 7 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 2.981 AGE IS APPARENTLY TOO YOUNG; FLOW PROBABLY FORMED 195-200 M.Y. AGO 15599 1 171 6 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 40AR-RAD=1.575 AND 1.499XE-10 MOL/GM; CALCULATED AGE IS AVERAGE OF 175 AND 167 M.Y. DATES AGE IS APPARENTLY TOO YOUNG; FLOW PROBABLY FORMED 195-200 M.Y. AGO 15600 1 193 8 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 2.017 minimum age of volcanism 15601 1 198 3 whole rock conventional K-Ar CT-L31 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "40AR-RAD=1.580, 1.597, 1.575, 1.624, 1.584, 1.642, AND 1.602XE-10 MOL/GM; CALCULATED AGE IS AVERAGE OF 190, 192, 189, 197, 193, 199, 195 M.Y. DATES" 15601 2 whole rock 39Ar-40Ar incremental (plateau) CT-L31 "4.962E-04, 0.581E-04, 1.1167E-04" NO PLATEAU AGE DETERMINED; SEE ARTICLE FOR ANALYTICAL DATA FOR 40-39AR ANALYSIS FLOW PROBABLY FORMED 195-200 M.Y. AGO 15602 1 196 4 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism "40AR-RAD=1.803, 1.704, 1.749, AND 1.776XE-10 MOL/GM; CALCULATED AGE IS AVERAGE OF 200, 190, 197, AND 197 M.Y. DATES" 15603 1 287 12 muscovite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 41.9 AGE GIVEN BY DETRITAL MUSCOVITE IN THE PORTLAND ARKOSE 15603 2 288 12 muscovite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 42.08 AGE GIVEN BY DETRITAL MUSCOVITE IN THE PORTLAND ARKOSE 15603 3 221 8 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 6.559 IMPURE BIOTITE OR VERY WEATHERED BIOTITE AGE GIVEN BY DETRITAL BIOTITE FROM PORTLAND ARKOSE 15603 4 225 8 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 6.693 IMPURE BIOTITE OR VERY WEATHERED BIOTITE AGE GIVEN BY DETRITAL BIOTITE FROM PORTLAND ARKOSE 15603 5 208 8 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 1.874 AGE GIVEN BY DETRITAL PLAGIOCLASE FROM PORTLAND ARKOSE 15604 1 164 6 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 3.02 7.452 A SPURIOUSLY LOW AGE FOR HORNFELS IN EAST BERLIN FM 15604 2 168 7 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 3.02 7.666 A SPURIOUSLY LOW AGE FOR HORNFELS IN EAST BERLIN FM 15605 1 277 10 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 8.299 AGE GIVEN BY DETRITAL AND DIAGENETIC COMPONENTS OF EAST BERLIN SHALE (OR MUDSTONE) 15605 2 279 10 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 8.389 AGE GIVEN BY DETRITAL AND DIAGENETIC COMPONENTS OF EAST BERLIN SHALE (OR MUDSTONE) 15606 1 227 18 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.19 4.15 AGE GIVEN BY DETRITAL AND DIAGENETIC COMPONENTS OF EAST BERLIN SHALE (OR MUDSTONE) 15606 2 245 18 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 1.19 4.507 AGE GIVEN BY DETRITAL AND DIAGENETIC COMPONENTS OF EAST BERLIN SHALE (OR MUDSTONE) 15607 1 180 8 whole rock conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 7.96 21.6 AGE GIVEN BY DETRITAL AND DIAGENETIC COMPONENTS OF EAST BERLIN SHALE (OR MUDSTONE) 15608 1 239 10 muscovite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 9.32 34.31 AGE GIVEN BY DETRITAL MUSCOVITE IN ARKOSE OF SHUTTLE MEADOW FM 15608 2 207 8 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 3.87 12.18 AGE GIVEN BY DETRITAL BIOTITE IN ARKOSE OF SHUTTLE MEADOW FM 15608 3 190 8 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.98 2.789 AGE GIVEN BY DETRITAL PLAGIOCLASE IN ARKOSE OF SHUTTLE MEADOW FM 15609 1 252 12 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.561 2.182 AGE GIVEN BY DETRITAL PLAGIOCLASE IN THE ARKOSE OF NEW HAVEN FM 15609 2 254 12 K feldspar conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 12.84 50.42 PLUTONIC K-FELDSPAR AGE GIVEN BY DETRITAL K-FELDSPAR IN THE ARKOSE OF NEW HAVEN FM 15610 1 233 10 muscovite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 10 35.7 AGE GIVEN BY DETRITAL MUSCOVITE IN THE ARKOSE OF NEW HAVEN FM 15610 2 196 8 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 6.75 20.12 AGE GIVEN BY DETRITAL BIOTITE IN THE ARKOSE OF NEW HAVEN FM 15611 1 206 22 plagioclase conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 0.678 2.124 AGE GIVEN BY DETRITAL PLAGIOCLASE IN THE ARKOSE OF NEW HAVEN FM 15611 2 251 10 K feldspar conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 13.56 52.47 PLUTONIC K-FELDSPAR AGE GIVEN BY DETRITAL K-FELDSPAR IN THE ARKOSE OF NEW HAVEN FM 15612 1 260 10 muscovite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 9.79 39.44 AGE GIVEN BY DETRITAL MUSCOVITE IN THE ARKOSE OF NEW HAVEN FM 15612 2 226 8 biotite conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 5.43 18.83 AGE GIVEN BY DETRITAL BIOTITE IN THE ARKOSE OF NEW HAVEN FM 15612 3 230 10 K feldspar conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" 14.6 51.58 PLUTONIC K-FELDSPAR AGE GIVEN BY DETRITAL K-FELDSPAR IN THE ARKOSE OF NEW HAVEN FM 15613 1 392 3 hornblende conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.182 1.1483 56 STOCK IS 400 M.Y. OLD. THIS ARTICLE WAS ALSO PUBLISHED IN 1981 (81-00030) 15614 1 23.8 0.8 biotite conventional K-Ar 1. 81AM176 "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 2.861 55 age of volcanism 15615 1 22 0.7 biotite conventional K-Ar 2. 81AM96 "4.962E-04, 0.581E-04, 1.1167E-04" 8.11 2.587 54 age of volcanism 15616 1 21.9 0.7 biotite conventional K-Ar 3. 83AM82 "4.962E-04, 0.581E-04, 1.1167E-04" 8.24 2.61 80 age of volcanism 15617 1 21.8 0.7 hornblende conventional K-Ar 4. AA1128 "4.962E-04, 0.581E-04, 1.1167E-04" 0.777 0.246 38 age of volcanism (SAMPLE NUMBER AA1127 SHOWN ON MAP--COMPILER) 15618 1 21.7 0.7 biotite conventional K-Ar 5. 81AM183 "4.962E-04, 0.581E-04, 1.1167E-04" 8.14 2.555 54 age of volcanism 15619 1 20.7 0.6 biotite conventional K-Ar 6. 81AG206 "4.962E-04, 0.581E-04, 1.1167E-04" 8.51 2.556 42 age of volcanism 15620 1 19.5 0.6 biotite conventional K-Ar 7. 81AG239 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 2.474 2971 age of volcanism SAMPLE NUMBER IS 81AG230 ON MAP--COMPILER 15621 1 18.7 0.5 sanidine conventional K-Ar 8. AK2091 "4.962E-04, 0.581E-04, 1.1167E-04" 5.7 1.539 2773 age of volcanism 15622 1 18.4 0.9 plagioclase conventional K-Ar 9. 82AM61 "4.962E-04, 0.581E-04, 1.1167E-04" 0.891 0.236 50 minimum age of volcanism ANDESINE(?) 15623 1 18.3 0.6 plagioclase conventional K-Ar 10. 81AM57 "4.962E-04, 0.581E-04, 1.1167E-04" 1.194 0.318 38 age of volcanism 15624 1 16.7 0.8 hornblende conventional K-Ar 11. AK2087 "4.962E-04, 0.581E-04, 1.1167E-04" 0.519 0.125 20 age of volcanism 15625 1 16.1 0.7 whole rock conventional K-Ar 12. AK2100 "4.962E-04, 0.581E-04, 1.1167E-04" 2.89 0.672 55 minimum age of volcanism 15626 1 14.4 0.7 whole rock conventional K-Ar 13. 81AM204 "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.125 14 minimum age of volcanism 15627 1 375 8 whole rock 39Ar-40Ar incremental (plateau) 6. P-64-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR ADDITIONAL ANALYTICAL DATA FOR WEIGHT-AVERAGE PLATEAU AGE 15627 2 376 whole rock 39Ar-40Ar total fusion 6. P-64-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion SEE ARTICLE FOR ADDITIONAL ANALYTICAL DATA FOR TOTAL GAS AGE 15628 1 305 whole rock 39Ar-40Ar total fusion 5. P-64-27 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization SEE ARTICLE FOR ADDITIONAL ANALYTICAL DATA FOR TOTAL GAS AGE DIKE PROBABLY FORMED 376 M.Y. AGO; ABOVE AGE IS A REDUCED AGE 15629 1 414 8 whole rock 39Ar-40Ar incremental (plateau) 2. PA-74-7 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion SEE ARTICLE FOR ADDITIONAL ANALYTICAL DATA ON WEIGHT-AVERAGE PLATEAU AGE 15629 2 390 whole rock 39Ar-40Ar total fusion 2. PA-74-7 "4.962E-04, 0.581E-04, 1.1167E-04" SEE ARTICLE FOR ADDITIONAL ANALYTICAL DATA ON TOTAL GAS AGE PLATEAU AGE IS 414 M.Y. 15630 1 299 whole rock 39Ar-40Ar total fusion 3. PA-74-9 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization SEE ARTICLE FOR ANALYTICAL INFORMATION ON TOTAL GAS AGE DIKE MAY BE 414 M.Y. OLD 15631 1 293 6 whole rock 39Ar-40Ar incremental (plateau) 15. PA-74-3 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization SEE ARTICLE FOR ANALYTICAL DATA FOR WEIGHT-AVERAGE PLATEAU AGE DIKE MAY BE AROUND 400 M.Y. OLD 15631 2 300 whole rock 39Ar-40Ar total fusion 15. PA-74-3 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization SEE ARTICLE FOR ANALYTICAL DATA FOR TOTAL GAS AGE DIKE MAY BE AROUND 400 M.Y. OLD 15632 1 298 whole rock 39Ar-40Ar total fusion 16. PA-74-4 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization SEE ARTICLE FOR ANALYTICAL DATA FOR TOTAL GAS AGE DIKE MAY BE AROUND 400 M.Y. OLD 15633 1 2.14 0.15 whole rock conventional K-Ar 1. 79H1A "4.962E-04, 0.581E-04, 1.1167E-04" 0.87 0.0269 6 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.722% AGE IS TOO OLD; ROCK IS PROBABLY AROUND 0.99 M.Y. OLD 15633 2 0.95 0.04 whole rock conventional K-Ar 3. 79H1A1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.87 0.0119 13 age of volcanism "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.722% 15634 1 2.55 0.21 whole rock conventional K-Ar 2. 791A2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.845 0.0311 5 UNCRUSHED CHUNKS OF ROCK MAY HAVE BEEN FUSED K=0.7014% AGE IS TOO OLD; LAVA IS PROBABLY AROUND 0.99 M.Y. OLD 15635 1 8.94 0.84 whole rock conventional K-Ar 4. 79H2-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7 0.0903 5 UNCRUSHED CHUNKS OF ROCKS WERE FUSED K=0.581% AGE IS TOO OLD; ROCK IS PROBABLY AROUND 1.57 M.Y. OLD 15636 1 1.57 0.16 whole rock conventional K-Ar 5. 79H2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.505 0.0115 5 age of volcanism "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.419% 15637 1 0.47 0.07 whole rock conventional K-Ar 6. 79H3A "4.962E-04, 0.581E-04, 1.1167E-04" 1.065 0.0072 3 age of volcanism "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.884% 15638 1 1.12 0.06 whole rock conventional K-Ar 7. 79H4-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.5 0.0081 8 K=0.415% AGE TOO YOUNG; ROCK IS PROBABLY 2.1 M.Y. OLD 15639 1 1.64 0.18 whole rock conventional K-Ar 8. 79H5-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.73 0.0172 4 age of intrusion "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.606% 15640 1 4.18 1.67 whole rock conventional K-Ar 9. 79H6-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.54 0.0325 1 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.448% THIS AGE IS TOO OLD; ROCK IS PROBABLY AROUND 1.4 M.Y. OLD 15641 1 1.01 0.08 whole rock conventional K-Ar 10. 79H7-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.0068 6 "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.390% THIS AGE IS TOO YOUNG; ROCK IS PROBABLY AROUND 1.4 M.Y. OLD 15642 1 1.23 0.05 whole rock conventional K-Ar 11. 79H7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.0078 14 "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.365% THIS AGE IS TOO YOUNG; ROCK IS PROBABLY AROUND 1.4 M.Y. OLD 15643 1 0.92 0.05 whole rock conventional K-Ar 12. 79H8-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.72 0.0096 7 age of volcanism "10-30 MESH, ROCK LEACHED WITH CONCENTRATED ACETIC ACID" K=0.598% 15644 1 1.52 0.07 whole rock conventional K-Ar 13. 79H8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.0146 10 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.556% THIS AGE IS TOO OLD; ROCK IS PROBABLY AROUND 0.9 M.Y. OLD 15645 1 3.87 0.28 whole rock conventional K-Ar 14. 79H9-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.53 0.0296 7 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.440% THIS AGE IS TOO OLD; ROCK IS PROBABLY AROUND 1.9 M.Y. OLD 15646 1 1.92 0.16 whole rock conventional K-Ar 15. 79H9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.475 0.0131 8 age of volcanism "10-30 MESH, ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID" K=0.394% 15647 1 1.04 0.07 whole rock conventional K-Ar 16. 79H10-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.73 0.0109 7 age of volcanism "10-30 MESH, ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID" K=0.606% 15648 1 1.09 0.06 whole rock conventional K-Ar 17. 79H10-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.705 0.0111 8 age of volcanism "10-30 MESH, ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID" K=0.585% 15649 1 1.36 0.09 whole rock conventional K-Ar 18. 79H17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.735 0.0144 8 age of volcanism "10-30 MESH, ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID" K=0.610% 15650 1 34.92 4.31 whole rock conventional K-Ar 19. 79H17-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7 0.3554 4 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.581% THIS AGE IS TOO OLD; ROCK IS PROBABLY AROUND 1.4 M.Y. OLD 15651 1 0.61 0.12 whole rock conventional K-Ar 20. 79H18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.0056 2 age of intrusion 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.523% 15652 1 1.37 0.11 whole rock conventional K-Ar 21. 79H19 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.0116 6 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.490% 15653 1 0.88 0.11 whole rock conventional K-Ar 22. 79H20-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.685 0.0088 4 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.569% 15654 1 2.18 0.18 whole rock conventional K-Ar 23. 80H1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.479 0.0151 6 age of volcanism 10-30 MESH ROCK LEACHED WITH CONCENTRATED ACETIC ACID K=0.398% 15655 1 2.06 0.24 whole rock conventional K-Ar 24. 80H4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.31 0.0094 4 age of volcanism 10-30 MESH ROCK LEACHED WITH CONCENTRATED ACETIC ACID K=0.26% 15656 1 7.61 0.21 whole rock conventional K-Ar 25. 80H6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.48 0.0532 2 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.40% THIS AGE IS TOO OLD; BASALT IS PROBABLY ABOUT 1.7 M.Y. OLD 15657 1 1.26 0.17 whole rock conventional K-Ar 26. 80H7-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.52 0.0094 4 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.432% 15657 2 6.05 0.17 whole rock conventional K-Ar 27. 80H7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.505 0.044 24 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.419% THIS AGE IS TOO OLD; BASALT IS PROBABLY ABOUT 1.3 M.Y. OLD 15658 1 7.07 0.76 whole rock conventional K-Ar 28. 80H9-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.295 0.0301 5 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.245% 15659 1 7.24 0.29 whole rock conventional K-Ar 29. 80H9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.31 0.0329 13 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.26% 15660 1 1.58 0.13 whole rock conventional K-Ar 30. 80H11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.0101 6 minimum age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.365% 15661 1 2.67 0.1 whole rock conventional K-Ar 31. 80H12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.51 0.0197 16 minimum age of volcanism 10-30 MESH ROCKS WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.423% 15662 1 7.34 0.39 whole rock conventional K-Ar 32. 80H13 "4.962E-04, 0.581E-04, 1.1167E-04" 0.744 0.079 30 UNCRUSHED CHUNKS OF ROCK K=0.618% SPURIOUS AGE; ROCK IS PROBABLY 1-2 M.Y. OLD 15663 1 1.08 0.14 whole rock conventional K-Ar 33. 80H14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.0104 4 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.556% 15664 1 0.78 0.04 whole rock conventional K-Ar 34. 80H15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.955 0.0108 11 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.793% 15665 1 1.6 0.23 whole rock conventional K-Ar 35. 80H16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.655 0.0151 6 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.544% 15666 1 1.36 0.11 whole rock conventional K-Ar 36. 80H17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.475 0.0093 7 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.394% 15667 1 4.52 0.13 whole rock conventional K-Ar 37. 80H18 "4.962E-04, 0.581E-04, 1.1167E-04" 0.535 0.0349 22 UNCRUSHED CHUNKS OF ROCK WERE FUSED K=0.444% THIS AGE IS TOO OLD; ROCK IS PROBABLY AROUND 1.6 M.Y. OLD 15668 1 1.67 0.09 whole rock conventional K-Ar 38. 80H19 "4.962E-04, 0.581E-04, 1.1167E-04" 0.505 0.0121 10 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.419% 15669 1 1.81 0.11 whole rock conventional K-Ar 39. 80H20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.46 0.012 12 age of volcanism 10-30 MESH ROCK WAS LEACHED WITH CONCENTRATED ACETIC ACID K=0.382% 15673 1 86 biotite conventional K-Ar MP-82 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN THIS IS A REDUCED AGE; ROCK IS PROBABLY 98 M.Y. OLD 15673 2 95 hornblende conventional K-Ar MP-82 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15674 1 89 biotite conventional K-Ar MP-455 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN A REDUCED AGE; ROCK IS PROBABLY AROUND 100 M.Y. OLD 15674 2 85 hornblende conventional K-Ar MP-455 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN A REDUCED AGE; ROCK IS PROBABLY AROUND 100 M.Y. OLD 15675 1 6.3 0.2 sanidine conventional K-Ar 1. (LABCAN081) "4.962E-04, 0.581E-04, 1.1167E-04" 6.58 0.6015 45 age of volcanism SANIDINE PHENOCRYSTS FROM GLASSY PUMICE FRAGMENTS 15676 1 6.3 0.2 sanidine conventional K-Ar 2 (83G-SPEAR) "4.962E-04, 0.581E-04, 1.1167E-04" 6.66 0.6018 41 age of volcanism 15677 1 55 1.7 muscovite conventional K-Ar OP799 "4.962E-04, 0.581E-04, 1.1167E-04" 7.53 6.052 85 "LISTED AS ""WHITE MICA CONCENTRATE""" MINIMUM AGE OF THRUSTING; THRUSTING PROBABLY ENDED ABOUT 59 M.Y. AGO 15677 2 54.9 2 muscovite conventional K-Ar OP799 "4.962E-04, 0.581E-04, 1.1167E-04" 7.53 6.046 76 "LISTED AS ""WHITE MICA CONCENTRATE""" MINIMUM AGE OF THRUSTING; THRUSTING PROBABLY ENDED ABOUT 59 M.Y. AGO 15677 3 59 muscovite OP799 "4.962E-04, 0.581E-04, 1.1167E-04" 7.53 6.052 85 641 "LISTED AS ""WHITE MICA CONCENTRATE""" 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15677 4 59 muscovite OP799 "4.962E-04, 0.581E-04, 1.1167E-04" 7.53 6.046 76 641 "LISTED AS ""WHITE MICA CONCENTRATE""" 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15678 1 58.6 2.2 biotite conventional K-Ar OP799A "4.962E-04, 0.581E-04, 1.1167E-04" 3.213 2.753 66 IMPURE BIOTITE AND WHITE MICA CONCENTRATE AGE OF THRUSTING AND METAMORPHISM 15678 2 59 biotite OP799A "4.962E-04, 0.581E-04, 1.1167E-04" 3.213 2.753 66 641 IMPURE BIOTITE AND WHITE MICA CONCENTRATE 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15679 1 54.5 2 biotite conventional K-Ar OP799B "4.962E-04, 0.581E-04, 1.1167E-04" 4.003 3.189 81 BIOTITE AND WHITE MICA CONCENTRATE MINIMUM AGE OF THRUSTING; THRUSTING PROBABLY ENDED ABOUT 59 M.Y. AGO 15679 2 59 biotite OP799B "4.962E-04, 0.581E-04, 1.1167E-04" 4.003 3.189 81 641 BIOTITE AND WHITE MICA CONCENTRATE 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15680 1 58.3 2.2 whole rock conventional K-Ar OP799E "4.962E-04, 0.581E-04, 1.1167E-04" 2.246 1.916 70 AGE OF THRUSTING AND METAMORPHISM 15680 2 58.3 1.9 whole rock conventional K-Ar OP799E "4.962E-04, 0.581E-04, 1.1167E-04" 2.246 1.917 80 AGE OF THRUSTING AND METAMORPHISM 15680 3 59 whole rock OP799E "4.962E-04, 0.581E-04, 1.1167E-04" 2.246 1.916 70 641 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15680 4 59 whole rock OP799E "4.962E-04, 0.581E-04, 1.1167E-04" 2.246 1.917 80 641 age of intrusion 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15681 1 59.9 1.9 biotite conventional K-Ar OP799H "4.962E-04, 0.581E-04, 1.1167E-04" 3.483 3.052 66 AGE OF THRUSTING AND METAMORPHISM 15681 2 59 biotite OP799H "4.962E-04, 0.581E-04, 1.1167E-04" 3.483 3.052 66 641 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15682 1 59.7 2 biotite conventional K-Ar OP799I-1 "4.962E-04, 0.581E-04, 1.1167E-04" 5.72 4.997 87 AGE OF THRUSTING AND METAMORPHISM 15682 2 59 biotite OP799I-1 "4.962E-04, 0.581E-04, 1.1167E-04" 5.72 4.997 87 641 8-POINT K-AR ISOCHRON AGE OF THRUSTING AND METAMORPHISM 15683 1 32.3 1 biotite conventional K-Ar GH46A "4.962E-04, 0.581E-04, 1.1167E-04" 9.28 4.36 76 A REDUCED AGE 15683 2 59.4 2 hornblende conventional K-Ar GH46B "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.524 53 APPROXIMATE AGE OF END OF THRUSTING AND METAMORPHISM 15684 1 70.2 2.2 whole rock conventional K-Ar PR90 "4.962E-04, 0.581E-04, 1.1167E-04" 2.336 2.407 90 age of metamorphic crystallization 15685 1 72.1 2.3 whole rock conventional K-Ar PR91 "4.962E-04, 0.581E-04, 1.1167E-04" 3.07 3.249 64 age of metamorphic crystallization 15686 1 35.9 1.2 whole rock conventional K-Ar PR92 "4.962E-04, 0.581E-04, 1.1167E-04" 2.44 1.275 56 THIS IS A REDUCED AGE; PHYLLITE PROBABLY FORMED 60-70 M.Y. AGO 15687 1 39.2 1.8 whole rock conventional K-Ar PR93 "4.962E-04, 0.581E-04, 1.1167E-04" 1.944 1.109 62 THIS IS A REDUCED AGE; PHYLLITE PROBABLY FORMED 60-70 M.Y. AGO 15688 1 160.21 8 hornblende conventional K-Ar DR-998 "4.72E-04, 0.585E-04, 1.19E-04*" 0.257 0.6199 55 age of intrusion 15689 1 147.56 7 hornblende conventional K-Ar DR-1062 "4.72E-04, 0.585E-04, 1.19E-04*" 0.249 0.5512 55 age of intrusion 15690 1 179 8 hornblende conventional K-Ar ABC-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.207 0.5608 9 age of intrusion "AGE OF CLAST, NOT CONGLOMERATE" 15691 1 145.31 4 hornblende conventional K-Ar ABC-4 "4.72E-04, 0.585E-04, 1.19E-04*" 0.098 0.2135 52 age of intrusion "AGE OF CLASTS, NOT CONGLOMERATE" 15692 1 189.71 7 hornblende conventional K-Ar ABI-1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.25 0.72 54 age of intrusion "AGE OF CLAST, NOT CONGLOMERATE" 15693 1 82.2 3 hornblende conventional K-Ar OC-3 "4.72E-04, 0.585E-04, 1.19E-04*" 0.239 0.199 22 age of intrusion "AGE OF CLAST, NOT CONGLOMERATE" 15694 1 137.68 4 hornblende conventional K-Ar DR-1169A "4.72E-04, 0.585E-04, 1.19E-04*" 0.204 0.4202 55 age of intrusion 15695 1 168.12 6 hornblende conventional K-Ar DR-1182C "4.72E-04, 0.585E-04, 1.19E-04*" 0.19 0.482 26 age of intrusion 15696 1 211.69 10 hornblende conventional K-Ar DR-1189C "4.72E-04, 0.585E-04, 1.19E-04*" 0.107 0.346 41 age of intrusion 15697 1 156 2 muscovite conventional K-Ar 1. (672) "4.962E-04, 0.581E-04, 1.1167E-04" 22.625 9691 age of metamorphic crystallization "K=8.09, 7.95%; 40AR-RAD=50.8 AND 50.6XE-6 SCC/GM" 15698 1 151 2 muscovite conventional K-Ar 2. (1210) "4.962E-04, 0.581E-04, 1.1167E-04" 22.98 9592 age of metamorphic crystallization "K=8.46, 8.39%; 40AR-RAD=51.0 AND 52.0XE-6 SCC/GM" 15699 1 151 3 amphiboles conventional K-Ar 3. (65) "4.962E-04, 0.581E-04, 1.1167E-04" 0.8099 7785 age of metamorphic crystallization "K=0.300, 0.295%; 40AR-RAD=1.82 AND 1.81XE-6 SCC/GM" 15700 1 141 2 muscovite conventional K-Ar 4. (77) "4.962E-04, 0.581E-04, 1.1167E-04" 21.285 9597 age of metamorphic crystallization "K=8.37, 8.37%; 40AR-RAD=48.5 AND 46.9XE-6 SCC/GM" 15701 1 153 2 muscovite conventional K-Ar 5. (967M) "4.962E-04, 0.581E-04, 1.1167E-04" 21.13 9190 age of metamorphic crystallization "K=7.75, 7.55%; 40AR-RAD=47.8 AND 46.9XE-6 SCC/GM" 15702 1 151 2 muscovite conventional K-Ar 6. (967M2) "4.962E-04, 0.581E-04, 1.1167E-04" 23.335 9392 age of metamorphic crystallization "K=8.74, 8.36%; 40AR-RAD=53.0 AND 51.6XE-6 SCC/GM" 15702 2 142 3 tremolite conventional K-Ar 6. (967M2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5912 7351 minimum age of metamorphic crystallization "K=0.232, 0.228%; 40AR-RAD=1.33 AND 1.32XE-6 SCC/GM" 15703 1 151 2 muscovite conventional K-Ar 7. (XX) "4.962E-04, 0.581E-04, 1.1167E-04" 22.285 9594 age of metamorphic crystallization "K=8.23, 8.11%; 40AR-RAD=50.5 AND 49.4XE-6 SCC/GM" 15703 2 168 9 whole rock conventional K-Ar 7. (XX) "4.962E-04, 0.581E-04, 1.1167E-04" 0.334 0.8478 7875 age not evaluated K=0.277%; 40AR-RAD=1.97 AND 1.83XE-6 SCC/GM 15704 1 153 2 muscovite conventional K-Ar 8. (XY) "4.962E-04, 0.581E-04, 1.1167E-04" 22.175 9391 age of metamorphic crystallization "K=8.04, 7.99%; 40AR-RAD=48.8 AND 50.6XE-6 SCC/GM" 15704 2 158 3 whole rock conventional K-Ar 8. (XY) "4.962E-04, 0.581E-04, 1.1167E-04" 3.69 80 age of metamorphic crystallization "K=1.27, 1.30%; 40AR-RAD=8.27XE-6 SCC/GM" 15705 1 141 2 muscovite conventional K-Ar 9. (1340) "4.962E-04, 0.581E-04, 1.1167E-04" 22.375 9487 age of metamorphic crystallization "K=8.80, 8.76%; 40AR-RAD=49.4 AND 50.9XE-6 SCC/GM" 15705 2 146 4 amphiboles conventional K-Ar 9. (1340) "4.962E-04, 0.581E-04, 1.1167E-04" 0.2008 54 age of metamorphic crystallization BLUE AMPHIBOLE 1 "K=0.075, 0.077%; 40AR-RAD=0.45XE-6 SCC/GM" 15705 3 136 4 amphiboles conventional K-Ar 9. (1340) "4.962E-04, 0.581E-04, 1.1167E-04" 0.2075 6060 minimum age of metamorphic crystallization BLUE AMPHIBOLE 2 "K=0.086, 0.083%; 40AR-RAD=0.47 AND 0.46XE-6 SCC/GM" 15705 4 125 23 whole rock conventional K-Ar 9. (1340) "4.962E-04, 0.581E-04, 1.1167E-04" 2.459 80 age not evaluated "K=0.952, 1.23%; 40AR-RAD=5.51XE-6 SCC/GM" 15706 1 159 3 muscovite conventional K-Ar 10. (T) "4.962E-04, 0.581E-04, 1.1167E-04" 24.135 9190 age of metamorphic crystallization "K=8.42, 8.35%; 40AR-RAD=54.2 AND 54.0XE-6 SCC/GM" 15707 1 149 2 muscovite conventional K-Ar 11. (U) "4.962E-04, 0.581E-04, 1.1167E-04" 22.245 9588 age of metamorphic crystallization "K=8.26, 8.30%; 40AR-RAD=49.1 AND 50.6XE-6 SCC/GM" 15708 1 144 2 muscovite conventional K-Ar 12. (1060) "4.962E-04, 0.581E-04, 1.1167E-04" 22.31 9490 age of metamorphic crystallization "K=8.65, 8.50%; 40AR-RAD=50.0 AND 50.0XE-6 SCC/GM" 15709 1 152 2 muscovite conventional K-Ar 13. (ZZP) "4.962E-04, 0.581E-04, 1.1167E-04" 19.5 9290 age of metamorphic crystallization "K=7.04, 7.12%; 40AR-RAD=43.7 AND 43.7XE-6 SCC/GM" 15709 2 142 3 whole rock conventional K-Ar 13. (ZZP) "4.962E-04, 0.581E-04, 1.1167E-04" 0.406 56 age of metamorphic crystallization "K=0.158, 0.160%; 40AR-RAD=0.91XE-6 SCC/GM" 15710 1 159 3 actinolite conventional K-Ar 14. (M585) "4.962E-04, 0.581E-04, 1.1167E-04" 1.0106 8279 age of metamorphic crystallization "K=0.350, 0.353%; 40AR-RAD=0.350 AND 0.353XE-6 SCC/GM" 15711 1 143 2 muscovite conventional K-Ar 15. (M558) "4.962E-04, 0.581E-04, 1.1167E-04" 21.105 9396 age of metamorphic crystallization "K=8.18, 8.18%; 40AR-RAD=46.8 AND 47.8XE-6 SCC/GM" 15712 1 155 2 muscovite conventional K-Ar 16. (L-640) "4.962E-04, 0.581E-04, 1.1167E-04" 23.915 9395 age of metamorphic crystallization "K=8.42, 8.57%; 40AR-RAD=54.1 AND 53.1XE-6 SCC/GM" 15712 2 136 3 amphiboles conventional K-Ar 16. (L-640) "4.962E-04, 0.581E-04, 1.1167E-04" 0.9058 7278 BLUE AMPHIBOLE "K=0.368, 0.372%; 40AR-RAD=2.01 AND 2.05XE-6 SCC/GM" THIS AGE SEEMS TOO YOUNG 15713 1 150 2 muscovite conventional K-Ar 17. (L-855) "4.962E-04, 0.581E-04, 1.1167E-04" 27.8 9591 age of metamorphic crystallization "K=8.29, 8.47%; 40AR-RAD=50.7 AND 51.5XE-6 SCC/GM" 15713 2 148 3 actinolite conventional K-Ar 17. (L-855) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5466 6767 age of metamorphic crystallization "K=0.206, 0.204%; 40AR-RAD=1.20 AND 1.25XE-6 SCC/GM" 15714 1 122 3 amphiboles conventional K-Ar 18. (L-642) "4.962E-04, 0.581E-04, 1.1167E-04" 1.722 7272 BLUE AMPHIBOLE "K=0.789, 0.790%; 40AR-RAD=3.90 AND 3.82XE-6 SCC/GM" THIS AGE SEEMS TOO YOUNG--CAUSE UNKNOWN 15715 1 137 3 amphiboles conventional K-Ar 19. (L-820) "4.962E-04, 0.581E-04, 1.1167E-04" 0.4504 7578 minimum age of metamorphic crystallization BLUE AMPHIBOLE "K=0.386, 0.385%; 40AR-RAD=2.12 AND 2.14XE-6 SCC/GM" 15716 1 143 3 amphiboles conventional K-Ar 20. (L-822) "4.962E-04, 0.581E-04, 1.1167E-04" 0.6336 7167 age of metamorphic crystallization BLUE AMPHIBOLE "K=0.244, 0.246%; 40AR-RAD=1.42 AND 1.42XE-6 SCC/GM" 15717 1 98 16 amphiboles conventional K-Ar 21. (L-856) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0663 2512 age not evaluated BLUE AMPHIBOLE (UNUSUALLY LOW POTASSIUM CONTENT--COMPILER) "K=0.039, 0.037%; 40AR-RAD=0.165 AND 0.132XE-6 SCC/GM" 15718 1 108 4 amphiboles conventional K-Ar 22. (L-865) "4.962E-04, 0.581E-04, 1.1167E-04" 0.2557 2836 BLUE AMPHIBOLE THIS AGE SEEMS TOO YOUNG--CAUSE UNKNOWN 15719 1 135 3 whole rock conventional K-Ar 23. (L-859) "4.962E-04, 0.581E-04, 1.1167E-04" 2.633 79 minimum age of metamorphic crystallization "K=1.08, 1.08%; 40AR-RAD=5.90XE-6 SCC/GM" 15720 1 130 3 whole rock conventional K-Ar 24. (L-860) "4.962E-04, 0.581E-04, 1.1167E-04" 4.9975 8486 minimum age of metamorphic crystallization "K=2.15, 2.13%; 40AR-RAD=11.4 AND 11.0XE-6 SCC/GM" 15721 1 141 5 whole rock conventional K-Ar 25. (L-861) "4.962E-04, 0.581E-04, 1.1167E-04" 3.311 82 minimum age of metamorphic crystallization "K=1.35, 1.30, 1.26%; 40AR-RAD= 7.42XE-6 SCC/GM" 15722 1 110 9 amphiboles conventional K-Ar 26. (L-863) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0754 913 age not evaluated BLUE AMPHIBOLE (UNUSUALLY LOW POTASSIUM CONTENT--COMPILER) "K=0.038, 0.039%; 40AR-RAD=0.173 AND 0.165XE-6 SCC/GM" 15723 1 125 2 whole rock conventional K-Ar 27 (L-44B) "4.962E-04, 0.581E-04, 1.1167E-04" 0.4685 4741 minimum age of metamorphic crystallization "K=0.210, 0.207%; 40AR-RAD=1.03 AND 1.07XE-6 SCC/GM" 15724 1 132 2 whole rock conventional K-Ar 28. (L-46B) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5556 5156 minimum age of metamorphic crystallization "K=0.233, 0.235%; 40AR-RAD=1.22 AND 1.27XE-6 SCC/GM" 15725 1 126 5 whole rock conventional K-Ar 29. (L-50) "4.962E-04, 0.581E-04, 1.1167E-04" 1.412 5659 minimum age of metamorphic crystallization "K=0.625, 0.623%; 40AR-RAD=3.27 AND 3.06XE-6 SCC/GM" 15726 1 122 2 whole rock conventional K-Ar 30. (L-84) "4.962E-04, 0.581E-04, 1.1167E-04" 2.1305 8379 minimum age of metamorphic crystallization "K=0.975, 0.977; 40AR-RAD=4.83 AND 4.72XE-6 SCC/GM" 15727 1 123 2 whole rock conventional K-Ar 31. (L-86) "4.962E-04, 0.581E-04, 1.1167E-04" 4.0425 7985 minimum age of metamorphic crystallization "K=1.83, 1.83%; 40AR-RAD=9.13 AND 8.99XE-6 SCC/GM" 15728 1 122 2 whole rock conventional K-Ar 32. (L-87) "4.962E-04, 0.581E-04, 1.1167E-04" 3.496 8787 minimum age of metamorphic crystallization "K=1.60, 1.60%; 40AR-RAD=7.77 AND 7.90XE-6 SCC/GM" 15729 1 121 2 whole rock conventional K-Ar 33. (L-105) "4.962E-04, 0.581E-04, 1.1167E-04" 2.389 7974 minimum age of metamorphic crystallization "K=1.09, 1.11%; 40AR-RAD=5.42 AND 5.29XE-6 SCC/GM" 15730 1 124 2 whole rock conventional K-Ar 34. (L-125) "4.962E-04, 0.581E-04, 1.1167E-04" 2.102 81 minimum age of metamorphic crystallization "K=0.958, 0.934%; 40AR-RAD=4.71XE-6 SCC/GM" 15731 1 126 3 whole rock conventional K-Ar 35. (L-130) "4.962E-04, 0.581E-04, 1.1167E-04" 2.7735 8584 minimum age of metamorphic crystallization "K=1.22, 1.23%; 40AR-RAD=6.14 AND 6.29XE-6 SCC/GM" 15732 1 132 3 whole rock conventional K-Ar 36. (L-136) "4.962E-04, 0.581E-04, 1.1167E-04" 1.3205 8285 minimum age of metamorphic crystallization "K=0.975, 0.983%; 40AR-RAD=5.17 AND 5.23XE-6 SCC/GM" 15733 1 130 3 whole rock conventional K-Ar 37. (J-1329) "4.962E-04, 0.581E-04, 1.1167E-04" 3.4445 8178 minimum age of metamorphic crystallization "K=1.48, 1.47%; 40AR-RAD=7.64 AND 7.80XE-6 SCC/GM" 15734 1 159 5 actinolite conventional K-Ar 38. (J-532A) "4.962E-04, 0.581E-04, 1.1167E-04" 0.2514 5533 age not evaluated "K=0.088, 0.086%; 40AR-RAD=0.554 AND 0.573XE-6 SCC/GM" 15735 1 158 5 actinolite conventional K-Ar 39. (J-532B) "4.962E-04, 0.581E-04, 1.1167E-04" 0.2459 37 age not evaluated "K=0.086, 0.086%; 40AR-RAD=0.551XE-6 SCC/GM" 15736 1 122 2 whole rock conventional K-Ar 40. (F-13) "4.962E-04, 0.581E-04, 1.1167E-04" 4.035 8586 minimum age of metamorphic crystallization "K=1.86, 1.86%; 40AR-RAD=9.19 AND 9.12XE-6 SCC/GM" 15737 1 125 3 whole rock conventional K-Ar 41. (F-16) "4.962E-04, 0.581E-04, 1.1167E-04" 2.8955 8785 minimum age of metamorphic crystallization "K=1.29, 1.29%; 40AR-RAD=6.37 AND 6.61XE-6 SCC/GM" 15738 1 113 2 whole rock conventional K-Ar 42. (F-17) "4.962E-04, 0.581E-04, 1.1167E-04" 4.7965 8080 minimum age of metamorphic crystallization "K=2.37, 2.36%; 40AR-RAD=10.7 AND 10.8XE-6 SCC/GM" 15739 1 158 3 whole rock conventional K-Ar 43. (F-19) "4.962E-04, 0.581E-04, 1.1167E-04" 4.64 8786 age not evaluated "K=1.63, 1.62%; 40AR-RAD=10.4 AND 10.4XE-6 SCC/GM" 15740 1 117 2 whole rock conventional K-Ar 44. (F-21) "4.962E-04, 0.581E-04, 1.1167E-04" 2.4025 8080 minimum age of metamorphic crystallization "K=1.14, 1.15%; 40AR-RAD=5.37 AND 5.40XE-6 SCC/GM" 15741 1 130 6 whole rock conventional K-Ar 45. (F-23) "4.962E-04, 0.581E-04, 1.1167E-04" 2.4095 7981 minimum age of metamorphic crystallization "K=1.03, 1.03%; 40AR-RAD=5.21 AND 5.59XE-6 SCC/GM" 15742 1 125 2 whole rock conventional K-Ar 46. (F-25) "4.962E-04, 0.581E-04, 1.1167E-04" 1.883 7880 minimum age of metamorphic crystallization "K=0.838, 0.845%; 40AR-RAD=4.17 AND 4.27XE-6 SCC/GM" 15743 1 62 20 whole rock conventional K-Ar 47. (F-9) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0098 23 "K=0.0093, 0.0086%; 40AR-RAD=0.021 AND 0.023XE-6 SCC/GM (UNUSUALLY LOW K-CONTENT FOR A WHOLE-ROCK--COMPILER)" MAY BE A REDUCED AGE 15744 1 113 13 whole rock conventional K-Ar 48. (F-10) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0964 1116 "K=0.0471, 0.0478%; 40AR-RAD=0.199 AND 0.233XE-6 SCC/GM" MAY BE A REDUCED AGE 15745 1 133 3 whole rock conventional K-Ar 49. (F-20) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5599 6162 minimum age of metamorphic crystallization "K=0.238, 0.229%; 40AR-RAD=1.23 AND 1.28XE-6 SCC/GM" 15746 1 131 6 whole rock conventional K-Ar 50. (F-22) "4.962E-04, 0.581E-04, 1.1167E-04" 2.967 2027 minimum age of metamorphic crystallization "K=1.26, 1.25%; 40AR-RAD=6.85 AND 6.45XE-6 SCC/GM" 15747 1 141 3 whole rock conventional K-Ar 51. (F-24) "4.962E-04, 0.581E-04, 1.1167E-04" 4.842 3354 minimum age of metamorphic crystallization "K=1.90, 1.90%; 40AR-RAD=10.7 AND 11.0XE-6 SCC/GM" 15748 1 79 3 whole rock conventional K-Ar 52. (F-26) "4.962E-04, 0.581E-04, 1.1167E-04" 0.3019 2730 "K=0.221, 0.210; 40AR-RAD=0.714 AND 0.639XE-6 SCC/GM" MAY BE A REDUCED AGE 15749 1 162 31 whole rock conventional K-Ar 53. (F-27) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0912 816 age not evaluated "K=0.0303, 0.0317%; 40AR-RAD=0.177 AND 0.232XE-6 SCC/GM" 15750 1 89 13 whole rock conventional K-Ar 54. (F-28) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0723 1721 "K=0.0491, 0.0421%; 40AR-RAD=0.151 AND 0.173XE-6 SCC/GM" MAY BE A REDUCED AGE 15751 1 143 7 hornblende conventional K-Ar 55. (C-123) "4.962E-04, 0.581E-04, 1.1167E-04" 0.4397 4245 "K=0.171, 0.169%; 40AR-RAD=1.02 AND 0.951XE-6 SCC/GM" THIS AGE MAY DATE A LATER THERMAL EVENT 15752 1 143 3 hornblende conventional K-Ar 56. (C-136) "4.962E-04, 0.581E-04, 1.1167E-04" 0.3679 4234 "K=0.143, 0.143%; 40AR-RAD=0.3677 AND 0.3681XE-6 SCC/GM" THIS AGE MAY DATE A LATER THERMAL EVENT 15753 1 144 3 hornblende conventional K-Ar 57. (C-151) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5288 4945 "K=0.202, 0.205%; 40AR-RAD=1.21 AND 1.16XE-6 SCC/GM" THIS AGE MAY DATE A LATER THERMAL EVENT 15754 1 166 3 hornblende conventional K-Ar 58. (F-8) "4.962E-04, 0.581E-04, 1.1167E-04" 0.4908 5454 age of intrusion "K=0.164, 0.161%; 40AR-RAD=1.09 AND 1.11XE-6 SCC/GM" 15755 1 121 28 whole rock conventional K-Ar 59. (F-14) "4.962E-04, 0.581E-04, 1.1167E-04" 0.0203 54 age not evaluated "K=0.0101, 0.0086%; 40AR-RAD=0.052 AND 0.039XE-6 SCC/GM (AN UNUSUALLY LOW K-CONTENT FOR A WHOLE-ROCK--COMPILER)" 15756 1 162 3 hornblende conventional K-Ar 60. (M-529) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5221 4341 age of metamorphic crystallization "K=0.178, 0.178%; 40AR-RAD=1.17 AND 1.17XE-6 SCC/GM" 15757 1 48.5 0.3 biotite conventional K-Ar 48480-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15758 1 50.3 0.4 biotite conventional K-Ar 5KF28L-3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.13 5.97 83 age of volcanism 15759 1 49.5 0.3 biotite conventional K-Ar 49480-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 6.2 93 age of intrusion 15760 1 46.7 0.4 biotite conventional K-Ar M82681-2 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15760 2 38 0.4 hornblende conventional K-Ar MB2681-2 "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN AGE APPEARS TOO YOUNG--SPURIOUS 15761 1 49.4 0.3 hornblende conventional K-Ar M91780-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.966 0.696 70 age of intrusion 15762 1 50.3 0.3 biotite conventional K-Ar M82980-10 "4.962E-04, 0.581E-04, 1.1167E-04" 7.02 5.16 65 age of intrusion 15763 1 49.6 0.3 biotite conventional K-Ar M91780-2 "4.962E-04, 0.581E-04, 1.1167E-04" 9.38 6.79 83 age of intrusion 15764 1 49.5 1.2 biotite conventional K-Ar 5-340 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6 6.21 53 age of intrusion 15764 2 45.3 1.1 hornblende conventional K-Ar 5-340 "4.962E-04, 0.581E-04, 1.1167E-04" 1 0.66 38 AGE IS TOO YOUNG--SPURIOUS 15765 1 49.4 1.2 biotite conventional K-Ar 5-341 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 6.29 56 age of intrusion 15766 1 52.5 1.3 biotite conventional K-Ar S-351 "4.962E-04, 0.581E-04, 1.1167E-04" 8.15 6.26 44 age of intrusion 15767 1 45.2 1.1 biotite conventional K-Ar LWH-54453 "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 5.91 57 age of intrusion 15767 2 47.7 1.2 hornblende conventional K-Ar LWH-54453 "4.962E-04, 0.581E-04, 1.1167E-04" 0.678 0.471 28 age of intrusion 15768 1 49.6 1.2 biotite conventional K-Ar I-51G "4.962E-04, 0.581E-04, 1.1167E-04" 8.62 6.24 55 age of intrusion 15769 1 49.9 0.3 biotite conventional K-Ar FM91780-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.29 6.04 78 age of intrusion 15770 1 51.1 1.3 biotite conventional K-Ar BA-82-54E "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 6.69 68 age of intrusion 15771 1 61.3 2.3 biotite conventional K-Ar A65677 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion WEATHERED BIOTITE NO ANALYTICAL DATA GIVEN 15772 1 55.7 2 sericite conventional K-Ar A-56471 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15773 1 57.7 2.1 muscovite conventional K-Ar A-56470 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15774 1 58.8 2.2 biotite conventional K-Ar 465679 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15775 1 49.9 0.3 biotite conventional K-Ar RWHNE985C "4.962E-04, 0.581E-04, 1.1167E-04" 9.03 6.57 73 minimum age of intrusion 15776 1 53.4 1.3 biotite conventional K-Ar HOL-39 "4.962E-04, 0.581E-04, 1.1167E-04" 9.53 7.44 75 age of intrusion 15777 1 54.5 0.4 biotite conventional K-Ar K-51B "4.962E-04, 0.581E-04, 1.1167E-04" 8.4 6.68 93 age of intrusion 15778 1 57.4 1.4 biotite conventional K-Ar HOL-276 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 7.77 80 THIS IS PROBABLY A REDUCED AGE 15778 2 75.2 1.9 hornblende conventional K-Ar HOL-276 "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 1.5 57 age of metamorphic crystallization 15779 1 71.1 2 hornblende conventional K-Ar K-52B "4.962E-04, 0.581E-04, 1.1167E-04" 0.998 1.04 17 age of intrusion 15780 1 48.9 1.2 biotite conventional K-Ar HOL-277 "4.962E-04, 0.581E-04, 1.1167E-04" 9.42 6.71 52 THIS IS PROBABLY A REDUCED AGE 15780 2 72.1 1.8 hornblende conventional K-Ar HOL-277 "4.962E-04, 0.581E-04, 1.1167E-04" 1.32 1.39 59 age of intrusion 15781 1 51.2 1.8 K feldspar conventional K-Ar 1. KELLER "4.962E-04, 0.581E-04, 1.1167E-04" 10.32 90 minimum age of intrusion "K=11.46, 11.45%; 40AR-RAD=23.136XE-6 CC/GM" 15782 1 46.9 1.6 K feldspar conventional K-Ar 2. SILVER DYKE "4.962E-04, 0.581E-04, 1.1167E-04" 9.281 66 minimum age of intrusion "K=11.33, 11.21%; 40AR-RAD=20.801XE-6 CC/GM" 15783 1 86 biotite conventional K-Ar MP-82 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15783 2 95 hornblende conventional K-Ar MP-82 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15784 1 89 biotite conventional K-Ar MP-455 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15784 2 85 hornblende conventional K-Ar MP-455 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15785 1 125 4 whole rock conventional K-Ar FR6 "4.72E-04, 0.584E-04, 1.19E-04" 2.9 50 minimum age of metamorphic crystallization "K=1.27, 1.25%; 40AR-RAD=6.50XE-6 CC/GM" 15786 1 127 4 whole rock conventional K-Ar 9 "4.72E-04, 0.584E-04, 1.19E-04" 2.784 48 minimum age of metamorphic crystallization "K=1.21, 1.21%; 40AR-RAD=6.24XE-6 CC/GM" 15787 1 123 4 whole rock conventional K-Ar FR101 "4.72E-04, 0.584E-04, 1.19E-04" 2.405 61 minimum age of metamorphic crystallization "K=1.08, 1.08%; 40AR-RAD=5.39XE-6 CC/GM" 15788 1 136 4 whole rock conventional K-Ar PP2 "4.72E-04, 0.584E-04, 1.19E-04" 1.682 60 minimum age of metamorphic crystallization "K=0.672, 0.669%; 40AR-RAD=3.77XE-6 CC/GM" 15789 1 155 3 whole rock conventional K-Ar CMSV(6) "4.72E-04, 0.584E-04, 1.19E-04" 5.868 82 age of metamorphic crystallization "K=2.05, 2.03%; 40AR-RAD=13.15XE-6 CC/GM" 15790 1 145 3 common micas conventional K-Ar 969CM "4.72E-04, 0.584E-04, 1.19E-04" 20.68 85 age of metamorphic crystallization "K=7.75, 7.71%; 40AR-RAD=46.35XE-6 CC/GM" 15791 1 151 3 common micas conventional K-Ar 198 "4.72E-04, 0.584E-04, 1.19E-04" 16.53 88 age of metamorphic crystallization "K=6.00, 5.97%; 40AR-RAD=37.05XE-6 CC/GM" 15792 1 118.99 3 amphiboles conventional K-Ar 199 "4.72E-04, 0.584E-04, 1.19E-04*" 1.693 2.998 6052 "K=1.405%; 40AR-RAD=6.79, 6.65XE-6 CC/GM" THIS AGE APPEARS TO BE TOO YOUNG 15792 2 150 3 common micas conventional K-Ar 199 "4.72E-04, 0.584E-04, 1.19E-04" 23.31 928985 age of metamorphic crystallization "K=8.42, 8.47%; 40AR-RAD=51.7, 52.4, 52.6XE-6 CC/GM" 15793 1 107.64 2 whole rock conventional K-Ar 197 "4.72E-04, 0.584E-04, 1.19E-04*" 1.26 2.012 50 minimum age of metamorphic crystallization K=1.05%; 40AR-RAD=4.51XE-6 CC/GM 15794 1 95.67 2 whole rock conventional K-Ar 914 "4.72E-04, 0.584E-04, 1.19E-04*" 1.795 2.539 76 minimum age of metamorphic crystallization K=1.490%; 40AR-RAD=5.69XE-6 CC/GM 15795 1 104 2 whole rock conventional K-Ar 401 "4.72E-04, 0.584E-04, 1.19E-04" 2.793 58 minimum age of metamorphic crystallization "K=1.46, 1.48%; 40AR-RAD=6.26XE-6 CC/GM" 15796 1 108 2 whole rock conventional K-Ar 420 "4.72E-04, 0.584E-04, 1.19E-04" 2.967 62 minimum age of metamorphic crystallization "K=1.48, 1.49, 1.51%; 40AR-RAD=6.65XE-6 CC/GM" 15797 1 109 2 whole rock conventional K-Ar 653 "4.72E-04, 0.584E-04, 1.19E-04" 2.726 52 minimum age of metamorphic crystallization "K=1.35, 1.37%; 40AR-RAD=6.11XE-6 CC/GM" 15798 1 113.5 2 whole rock conventional K-Ar 1160 "4.72E-04, 0.584E-04, 1.19E-04" 2.981 72 minimum age of metamorphic crystallization "K=1.43, 1.43%; 40AR-RAD=6.68XE-6 CC/GM" 15799 1 105 2 whole rock conventional K-Ar 1816 "4.72E-04, 0.584E-04, 1.19E-04" 1.896 60 minimum age of metamorphic crystallization "K=0.981, 0.991%; 40AR-RAD=4.25XE-6 CC/GM" 15800 1 115 2 whole rock conventional K-Ar 1844 "4.72E-04, 0.584E-04, 1.19E-04" 2.566 72 minimum age of metamorphic crystallization "K=1.21, 1.21%; 40AR-RAD=5.75XE-6 CC/GM" 15801 1 111.5 2 whole rock conventional K-Ar 1858 "4.72E-04, 0.584E-04, 1.19E-04" 2.329 66 minimum age of metamorphic crystallization "K=1.14, 1.14%; 40AR-RAD=5.22XE-6 CC/GM" 15802 1 124 2 whole rock conventional K-Ar 1875 "4.72E-04, 0.584E-04, 1.19E-04" 2.37 6773 minimum age of metamorphic crystallization "K=1.04, 1.03%; 40AR-RAD=5.36, 5.26XE-6 CC/GM" 15803 1 136 3 whole rock conventional K-Ar 1886 "4.72E-04, 0.584E-04, 1.19E-04" 1.276 45 minimum age of metamorphic crystallization "K=0.52, 0.50%; 40AR-RAD=2.86XE-6 CC/GM" 15804 1 114 2 whole rock conventional K-Ar 1895 "4.72E-04, 0.584E-04, 1.19E-04" 2.74 80 minimum age of metamorphic crystallization "K=1.31, 1.31%; 40AR-RAD=6.14XE-6 CC/GM" 15805 1 121 2 whole rock conventional K-Ar 1915 "4.72E-04, 0.584E-04, 1.19E-04" 2.026 47 minimum age of metamorphic crystallization "K=0.91, 0.91%; 40AR-RAD=4.54XE-6 CC/GM" 15806 1 119 2 whole rock conventional K-Ar 1925 "4.72E-04, 0.584E-04, 1.19E-04" 2.035 5355 minimum age of metamorphic crystallization "K=0.93, 0.93%; 40AR-RAD=4.60, 4.52XE-6 CC/GM" 15807 1 143 3 whole rock conventional K-Ar 1944 "4.72E-04, 0.584E-04, 1.19E-04" 4.922 79 minimum age of metamorphic crystallization "K=1.85, 1.86%; 40AR-RAD=11.03XE-6 CC/GM" 15808 1 104 2 whole rock conventional K-Ar 2035 "4.72E-04, 0.584E-04, 1.19E-04" 1.956 2954 minimum age of metamorphic crystallization "K=1.03, 1.02%; 40AR-RAD=4.50, 4.27XE-6 CC/GM" 15809 1 122 2 whole rock conventional K-Ar 2057 "4.72E-04, 0.585E-04, 1.19E-04" 1.865 73 minimum age of metamorphic crystallization "K=0.82, 0.84%; 40AR-RAD=4.18XE-6 CC/GM" 15810 1 148 3 common micas conventional K-Ar G19M "4.72E-04, 0.585E-04, 1.19E-04" 18.87 94 age of metamorphic crystallization "K=6.76, 7.00%; 40AR-RAD=42.28XE-6 CC/GM" 15811 1 147 3 muscovite conventional K-Ar GRS-1M "4.72E-04, 0.585E-04, 1.19E-04" 22.96 91 age of metamorphic crystallization "K=8.34, 8.47, 8.39%; 40AR-RAD=51.45XE-6 CC/GM" 15812 1 143 3 common micas conventional K-Ar 563M "4.72E-04, 0.584E-04, 1.19E-04" 20.41 91 age of metamorphic crystallization "K=7.88, 7.45, 7.85%; 40AR-RAD=45.75XE-6 CC/GM" 15812 2 143 3 amphiboles conventional K-Ar 563G "4.72E-04, 0.584E-04, 1.19E-04" 0.6052 2528 age of metamorphic crystallization "K=0.229, 0.227%; 40AR-RAD=1.379, 1.334XE-6 CC/GM" 15813 1 83 2 whole rock conventional K-Ar AR-1 "4.72E-04, 0.584E-04, 1.19E-04" 1.78 56 "K=1.18, 1.22, 1.20; 40AR-RAD=3.99XE-6 CC/GM" A VERY MINIMUM AGE FOR THE ROCK 15814 1 122 3 amphiboles conventional K-Ar X-111G "4.72E-04, 0.584E-04, 1.19E-04" 0.3806 36 age of metamorphic crystallization "K=0.169, 0.170%; 40AR-RAD=0.853XE-10 CC/GM" 15814 2 115 3 common micas conventional K-Ar X-111M "4.72E-04, 0.584E-04, 1.19E-04" 11.88 4064 age of metamorphic crystallization "K=5.40, 5.80, 5.61; 40AR-RAD=27.12, 26.13XE-6 CC/GM" 15815 1 110 2 whole rock conventional K-Ar DR185 "4.72E-04, 0.584E-04, 1.19E-04" 2.677 6971 minimum age of metamorphic crystallization "K=1.35, 1.30%; 40AR-RAD=5.70 AND 6.30XE-6 CC/GM" 15816 1 111 2 whole rock conventional K-Ar DR202B "4.72E-04, 0.584E-04, 1.19E-04" 2.626 5269 minimum age of metamorphic crystallization "K=1.30, 1.28%; 40AR-RAD=5.54 AND 6.23XE-6 CC/GM" 15817 1 76 2 whole rock conventional K-Ar DR203A "4.72E-04, 0.584E-04, 1.19E-04" 2.902 726368 "K=2.10, 2.08%; 40AR-RAD=6.23, 6.88, 6.40XE-6 CC/GM" A VERY MINIMUM AGE FOR THE ROCK 15818 1 106 2 whole rock conventional K-Ar DR55 "4.72E-04, 0.584E-04, 1.19E-04" 3.4915 6119 minimum age of metamorphic crystallization "K=1.81, 1.79%; 40AR-RAD=7.78 AND 7.87XE-6 CC/GM" 15819 1 116 2 whole rock conventional K-Ar DR291 "4.72E-04, 0.584E-04, 1.19E-04" 1.9635 6777 minimum age of metamorphic crystallization "K=0.933, 0.914%; 40AR-RAD=4.28 AND 4.52XE-6 CC/GM" 15820 1 93 2 whole rock conventional K-Ar DR7 "4.72E-04, 0.584E-04, 1.19E-04" 2.818 7262 minimum age of metamorphic crystallization "K=1.67, 1.63%; 40AR-RAD=6.47 AND 6.16XE-6 CC/GM" 15821 1 90 2 whole rock conventional K-Ar DR8 "4.72E-04, 0.584E-04, 1.19E-04" 3.0185 6880 minimum age of metamorphic crystallization "K=1.84, 1.85%; 40AR-RAD=6.33 AND 7.20XE-6 CC/GM" 15822 1 90 3 whole rock conventional K-Ar DR79 "4.72E-04, 0.584E-04, 1.19E-04" 2.409 325672 minimum age of metamorphic crystallization "K=1.48, 1.47%; 40AR-RAD=5.16, 5.34, AND 5.70XE-6 CC/GM" 15823 1 88 2 whole rock conventional K-Ar DR249 "4.72E-04, 0.584E-04, 1.19E-04" 3.0785 5071 minimum age of metamorphic crystallization "K=1.90, 1.92%; 40AR-RAD=6.91 AND 6.89XE-6 CC/GM" 15824 1 141 3 common micas conventional K-Ar 175A-MS "4.72E-04, 0.584E-04, 1.19E-04" 21.02 81 age of metamorphic crystallization "K=8.04, 8.06, 8.14%; 40AR-RAD=47.12XE-6 CC/GM" 15825 1 142 3 common micas conventional K-Ar GR-1M "4.72E-04, 0.584E-04, 1.19E-04" 21.025 7787 age of metamorphic crystallization "K=7.99, 7.98%; 40AR-RAD=47.34 AND 46.90XE-6 CC/GM" 15826 1 73.8 2 whole rock conventional K-Ar W-69-22 "4.72E-04, 0.584E-04, 1.19E-04" 1.664 40 minimum age of metamorphic crystallization "K=1.24, 1.24%; 40AR-RAD=3.73XE-6 CC/GM" 15827 1 87.7 2 whole rock conventional K-Ar W-69-59 "4.72E-04, 0.584E-04, 1.19E-04" 1.981 69 minimum age of metamorphic crystallization "K=1.23, 1.25%; 40AR-RAD=4.44XE-6 CC/GM" 15828 1 70.4 1.4 whole rock conventional K-Ar W-69-226 "4.72E-04, 0.584E-04, 1.19E-04" 1.851 72 minimum age of metamorphic crystallization "K=1.46, 1.44%; 40AR-RAD=4.15XE-6 CC/GM" 15829 1 109 3 hornblende conventional K-Ar 5A "4.72E-04, 0.584E-04, 1.19E-04" 0.526 3527 age of metamorphic crystallization "K=0.265, 0.263%; 40AR-RAD=1.176 AND 1.182XE-6 CC/GM" 15830 1 105 2 whole rock conventional K-Ar 509 "4.72E-04, 0.584E-04, 1.19E-04" 1.446 62 minimum age of metamorphic crystallization "K=0.750, 0.750%; 40AR-RAD=3.24XE-6 CC/GM" 15831 1 107 2 common micas conventional K-Ar 69-147M "4.72E-04, 0.584E-04, 1.19E-04" 11.36 8583 age of metamorphic crystallization "K=5.81, 5.80%; 40AR-RAD=25.46 AND 25.47XE-6 CC/GM" 15831 2 95.1 2.5 amphiboles conventional K-Ar 69-147G "4.72E-04, 0.584E-04, 1.19E-04" 0.4573 366143 "K=0.265, 0.264, 0.260%; 40AR-RAD=0.979, 1.069, 1.027XE-6 CC/GM" A REDUCED AGE 15832 1 102 9 whole rock conventional K-Ar 4-10R "4.72E-04, 0.584E-04, 1.19E-04" 0.2445 12 minimum age of metamorphic crystallization "K=0.132, 0.129%; 40AR-RAD=0.548XE-6 CC/GM" 15833 1 91 1.8 whole rock conventional K-Ar 4-12R "4.72E-04, 0.584E-04, 1.19E-04" 0.5749 4956 minimum age of metamorphic crystallization "K=0.350, 0.350, 0.339%; 40AR-RAD=1.280 AND 1.297XE-6 CC/GM" 15844 1 1100 biotite conventional K-Ar (NOT GIVEN) no decay constants given "DATA FROM SCOTT, R.W., AND MCELROY, M.N., 1964, PRECAMBRIAN-PALEOZOIC CONTACT IN TWO WELLS IN NW KANSAS: STATE GEOLOGICAL SURVEY OF KANSAS BULL. 170, PART 2, 15P." NO ANALYTICAL DATA GIVEN THIS IS A REDUCED AGE 15845 1 1240 biotite conventional K-Ar (NOT GIVEN) no decay constants given "DATA FROM SCOTT, R.W., AND MCELROY, M.N., 1964, PRECAMBRIAN-PALEOZOIC CONTACT IN TWO WELLS IN NW KANSAS: STATE GEOLOGICAL SURVEY OF KANSAS BULL. 170, PART 2, 15P." NO ANALYTICAL DATA GIVEN A HYBRED AGE 15846 1 1080 Unk conventional K-Ar (NOT GIVEN) "4.962E-04, 0.581E-04, 1.1167E-04" NO ANALYTICAL DATA GIVEN A HYBRID AGE 15847 1 900 Unk conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN AGE IS TOO YOUNG--SPURIOUS 15849 1 1100 biotite conventional K-Ar (NOT GIVEN) no decay constants given NO ANALYTICAL DATA GIVEN A HYBRED AGE 15851 1 2.4 Unk conventional K-Ar 1. (62) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN AGE MAY BE TOO OLD 15852 1 2.2 Unk conventional K-Ar 2 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15853 1 2 Unk conventional K-Ar 3. (64) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15854 1 1.89 Unk conventional K-Ar 4. (16) "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15855 1 1.8 Unk conventional K-Ar 5 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15856 1 1.76 Unk conventional K-Ar 6. (67) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15857 1 1.74 Unk conventional K-Ar 7 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15858 1 1.69 Unk conventional K-Ar 8. (10) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN AGE OF FORMATION 15859 1 1.66 hornblende conventional K-Ar 9 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15860 1 1.59 Unk conventional K-Ar 10 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15861 1 1.55 Unk conventional K-Ar 11 "4.72E-04, 0.585E-04, 1.19E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15862 1 1.5 Unk conventional K-Ar 12. (141) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15863 1 1.4 Unk conventional K-Ar 13. (1 AND 68) "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15864 1 1165 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 15865 1 1260 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04" age of intrusion NO ANALYTICAL DATA GIVEN 15866 1 1200 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 15867 1 1460 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04" age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 15868 1 1290 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.583E-04" minimum age of metamorphic crystallization NO ANALYTICAL DATA GIVEN 15876 1 9.4 0.5 alunite conventional K-Ar M256 "4.962E-04, 0.581E-04, 1.1167E-04" 1.234 49 TIME OF ALUNITE ALTERATION 15877 1 9.18 0.33 alunite conventional K-Ar M79-S-10 (BKA-3896) "4.962E-04, 0.581E-04, 1.1167E-04" 1.042 67 TIME OF ALUNITE ALTERATION 15879 1 22.8 0.65 whole rock conventional K-Ar M657 (KAA3842) "4.962E-04, 0.581E-04, 1.1167E-04" 1.254 91 age of volcanism 15880 1 13.8 0.5 sanidine conventional K-Ar BE-27 (D2767S) "4.962E-04, 0.581E-04, 1.1167E-04" 4.14 0.8263 80 age of volcanism 15881 1 13.9 0.5 sanidine conventional K-Ar BE-574 (D2768S) "4.962E-04, 0.581E-04, 1.1167E-04" 5.55 1.113 87 age of volcanism 15882 1 15.7 0.5 plagioclase conventional K-Ar OM-5 (D2769PL) "4.962E-04, 0.581E-04, 1.1167E-04" 1.57 0.3571 63 age of volcanism 15883 1 15.8 0.6 sanidine conventional K-Ar LG-2 (D2770S) "4.962E-04, 0.581E-04, 1.1167E-04" 6.61 1.515 82 age of volcanism 15884 1 8.1 1.3 plagioclase conventional K-Ar OM-12 (D2771PL) "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.0269 30 age of volcanism 15885 1 30.6 1 whole rock conventional K-Ar OM-57 (D2773R) "4.962E-04, 0.581E-04, 1.1167E-04" 1.71 0.7591 85 age of volcanism 15886 1 16 0.3 glass conventional K-Ar OC-77-BE-96 (7A231-2) "4.962E-04, 0.581E-04, 1.1167E-04" 5.18 1.195 8451 age of volcanism 40AR-RAD=1.19 AND 1.20XE-10 MOL/GM 15887 1 2.55 0.58 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.0222 6 age of volcanism 15888 1 13.5 0.2 biotite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 6.43 1.2586 44 age of volcanism 15889 1 16.5 0.4 whole rock conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.622 0.1488 18 age of volcanism 15890 1 18.1 0.5 plagioclase conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.508 0.1331 72 age of volcanism 15891 1 18.1 0.5 hornblende conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.477 0.1254 27 age of intrusion 15892 1 18.9 1.3 whole rock conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 5.23 1.4292 8 age of volcanism 15893 1 23.1 0.2 sanidine conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 11.33 3.7852 74 age of volcanism 15894 1 19.1 0.4 sanidine conventional K-Ar A "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15895 1 21.2 0.4 whole rock conventional K-Ar B "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15896 1 19.4 0.4 whole rock conventional K-Ar C "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15897 1 23.7 0.5 whole rock conventional K-Ar D "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15898 1 22.6 0.5 whole rock conventional K-Ar E "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15899 1 22.2 0.5 whole rock conventional K-Ar F "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15900 1 21.8 0.5 whole rock conventional K-Ar G "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15901 1 20.4 0.4 whole rock conventional K-Ar H "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism GROUNDMASS FRACTION WAS DATED NO ANALYTICAL DATA GIVEN 15902 1 23.1 0.5 biotite conventional K-Ar I "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN BIOTITE AND SANIDINE GAVE CONCORDANT AGES. 15903 1 17.3 0.4 sanidine conventional K-Ar J "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15904 1 16.2 whole rock conventional K-Ar A "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism WHOLE-ROCK GROUNDMASS NO ANALYTICAL DATA GIVEN 15904 2 16.6 plagioclase conventional K-Ar A "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15905 1 22.8 whole rock conventional K-Ar B "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism WHOLE-ROCK GROUNDMASS NO ANALYTICAL DATA GIVEN 15906 1 23.2 biotite conventional K-Ar C "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15907 1 24.9 biotite conventional K-Ar D "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15908 1 25.6 whole rock conventional K-Ar E "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism WHOLE-ROCK GROUNDMASS NO ANALYTICAL DATA GIVEN 15909 1 25.9 whole rock conventional K-Ar F "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism WHOLE-ROCK GROUNDMASS NO ANALYTICAL DATA GIVEN 15910 1 26.7 whole rock conventional K-Ar G "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism WHOLE-ROCK GROUNDMASS NO ANALYTICAL DATA GIVEN 15910 2 28.7 plagioclase conventional K-Ar G "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 15917 1 72 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN WEATHERING MAY HAVE REDUCED THE K-AR AGE 15918 1 80 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15919 1 81 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15920 1 80 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15921 1 84 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15922 1 72 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15923 1 76 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" NO ANALYTICAL DATA GIVEN PROBABLY A REDUCED AGE 15923 2 85 5 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15924 1 81 5 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15924 2 84 5 hornblende conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN 15925 1 4.03 0.12 whole rock conventional K-Ar 1 (JKM67-4-13A) "4.72E-04, 0.585E-04, 1.19E-04" 0.1031 33 age of volcanism (ANALYTICAL DATA IS FROM UNPUBLISHED SOURCES--COMPILER) 15926 1 5.18 0.15 biotite conventional K-Ar 2 (JFM67-4-18D) "4.72E-04, 0.585E-04, 1.19E-04" 0.6432 41 age of volcanism (ANALYTICAL DATA IS FROM UNPUBLISHED SOURCES--COMPILER) 15927 1 5.88 0.2 biotite conventional K-Ar 3 (JFM67-4-20G) "4.72E-04, 0.585E-04, 1.19E-04" 0.7042 54 age of volcanism (ANALYTICAL DATA IS FROM UNPUBLISHED SOURCES--COMPILER) 15928 1 36.4 2.3 hornblende conventional K-Ar SL-210-74 "4.72E-04, 0.585E-04, 1.19E-04" 0.3473 53 age of volcanism 15929 1 32.6 2.1 plagioclase conventional K-Ar SL-39A-74 "4.72E-04, 0.585E-04, 1.19E-04" 0.3199 69 age of volcanism 15930 1 73.4 2.5 biotite conventional K-Ar HL-24-72 "4.72E-04, 0.585E-04, 1.19E-04" 8.131 92 age of intrusion 15931 1 34.8 1.2 biotite conventional K-Ar SL-57-73 "4.72E-04, 0.585E-04, 1.19E-04" 3.908 84 age of intrusion 15931 2 32.5 1.2 sanidine conventional K-Ar SL-57-73 "4.72E-04, 0.585E-04, 1.19E-04" 3.593 87 minimum age of intrusion 15932 1 137.37 5 biotite conventional K-Ar 63APA177 "4.72E-04, 0.585E-04, 1.19E-04*" 2.64 5.425 72 age of volcanism 15933 1 83.52 3 hornblende conventional K-Ar 63APA216 "4.72E-04, 0.585E-04, 1.19E-04*" 0.569 0.7003 46 age of intrusion 15934 1 83.86 3 hornblende conventional K-Ar 63APA229 "4.72E-04, 0.585E-04, 1.19E-04*" 0.715 0.8836 73 age of intrusion 15939 1 5.29 0.35 whole rock conventional K-Ar WH-68-3 "4.72E-04, 0.585E-04, 1.19E-04*" 2.23 0.17 19 age of volcanism 15940 1 4.15 0.15 whole rock conventional K-Ar WH-68-1 "4.72E-04, 0.585E-04, 1.19E-04*" 1.77 0.1058 27 age of volcanism 15941 1 0.19 0.04 whole rock conventional K-Ar KA1923 "4.72E-04, 0.585E-04, 1.19E-04" 1.65 5 age of volcanism K=1.37% 15942 1 0.15 0.05 biotite conventional K-Ar KA2006R "4.72E-04, 0.585E-04, 1.19E-04" 8.19 3 age of volcanism K=6.8% 15943 1 0.28 0.07 whole rock conventional K-Ar KA2012 "4.72E-04, 0.585E-04, 1.19E-04" 1.38 4 age of volcanism K=1.15% 15944 1 0.44 0.04 whole rock conventional K-Ar KA2098 "4.72E-04, 0.585E-04, 1.19E-04" 2.24 4 age of volcanism K=1.86% 15961 1 304 12 magnesite conventional K-Ar 1. IMC-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.112 5.297 36 A MIXTURE OF MAGNESITE AND TALC "K=0.923%, 40AR-RAD=0.02117 PPM" SPURIOUS AGE--TOO OLD 15962 1 12.6 0.5 leonite conventional K-Ar 2. INC-2B "4.962E-04, 0.581E-04, 1.1167E-04" 22.356 4.061 28 A POTASSIUM MAGNESIUM SULFATE (HYDRATED) MINERAL "K=18.558%, 40AR-RAD=0.01623 PPM" AGE SEEMS TOO YOUNG TO DATE MINERAL FORMATION 15963 1 220 7 langbeinite conventional K-Ar 3. IMC 3A "4.962E-04, 0.581E-04, 1.1167E-04" 22.676 76.41 88 A POTASSIUM MAGNESIUM SULFATE MINERAL "K=18.823%, 40AR-RAD=0.3054 PPM" APPROXIMATE TIME OF MINERAL FORMATION 15963 2 188 6 langbeinite conventional K-Ar 3. IMC-3B "4.962E-04, 0.581E-04, 1.1167E-04" 22.254 63.4 89 A POTASSIUM MAGNESIUM SULFATE MINERAL "K=18.473%, 40AR-RAD=0.2534 PPM" APPROXIMATE TIME OF MINERAL FORMATION 15964 1 103 4 kieserite conventional K-Ar 4. IMC-4 "4.962E-04, 0.581E-04, 1.1167E-04" 5.032 7.656 67 A HYDRATED MAGNESIUM SULFATE MINERAL "K=4.177%, 40AR-RAD=0.03060 PPM" AGE APPEARS TO BE TOO YOUNG 15965 1 180 6 sylvite conventional K-Ar 5. IMC-5B "4.962E-04, 0.581E-04, 1.1167E-04" 63.609 173.6 90 K=52.802%; 40AR-RAD=0.6940 PPM APPROXIMATE TIME OF MINERAL FORMATION 15966 1 261 9 biotite conventional K-Ar S-915 "4.962E-04, 0.581E-04, 1.1167E-04" 8.868 37.37 7218 age of volcanism "K=7.329, 7.393%; 40AR-RAD=0.1435, 0.1552 PPM" 15967 1 257 9 biotite conventional K-Ar 72982 "4.962E-04, 0.581E-04, 1.1167E-04" 8.925 35.53 8285 age of volcanism "K=7.434, 7.383%; 40AR-RAD=0.1438, 0.1402 PPM" 15967 2 251 4 biotite conventional K-Ar 72982 "4.962E-04, 0.581E-04, 1.1167E-04" 9.086 35.18 79 age of volcanism "K=7.542%, 40AR-RAD=0.1406 PPM" 15968 1 1.88 0.05 whole rock conventional K-Ar 1. 79TF0004 "4.962E-04, 0.581E-04, 1.1167E-04" 1.54 0.0417 9 age of volcanism 15968 2 1.68 0.06 whole rock conventional K-Ar 1. 79TF0004 "4.962E-04, 0.581E-04, 1.1167E-04" 1.54 0.0373 6 minimum age of volcanism 15969 1 2.7 0.03 whole rock conventional K-Ar 2. 79SWC0010A "4.962E-04, 0.581E-04, 1.1167E-04" 1.69 0.0667 44 age of volcanism 15970 1 8.18 0.06 whole rock conventional K-Ar 3. 79EF0016A "4.962E-04, 0.581E-04, 1.1167E-04" 1.3 0.1535 66 age of volcanism 15971 1 0.79 0.06 whole rock conventional K-Ar C24 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.0088 9 age of volcanism 15971 2 0.63 0.06 whole rock conventional K-Ar 4. 79ZM0078 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.007 4 age of volcanism 15972 1 1.3 0.03 whole rock conventional K-Ar 5. 79SGV1111A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0201 23 AGES RANGE FROM 1.14-1.35 M.Y. FOR FOUR DETERMATIONS 15972 2 1.25 0.05 whole rock conventional K-Ar 5. 79SGV1111A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0194 11 age of volcanism AGES RANGE FROM 1.14-1.35 M.Y. FOR FOUR DETERMINATIONS 15972 3 1.35 0.05 whole rock conventional K-Ar 5. 79SGV1111A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0205 19 age of volcanism AGES RANGE FROM 1.14-1.35 M.Y. FOR FOUR DETERMINATIONS 15972 4 1.14 0.05 whole rock conventional K-Ar 5. 79SGV1111A "4.962E-04, 0.581E-04, 1.1167E-04" 0.0177 9 minimum age of volcanism AGES RANGE FROM 1.14-1.35 M.Y. FOR FOUR DETERMINATIONS 15973 1 0.4 0.05 whole rock conventional K-Ar 6. 79SGV1085 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.0058 5 age of intrusion AGES RANGE FROM 0.40-0.52 M.Y. FOR THREE DETERMINATIONS 15973 2 0.43 0.04 whole rock conventional K-Ar 6. 79SGV1085 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.0063 7 age of intrusion AGES RANGE FROM 0.40-0.52 M.Y. FOR THREE DETERMINATIONS 15973 3 0.52 0.04 whole rock conventional K-Ar 6. 79SGV1085 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.0076 19 age of intrusion AGES RANGE FROM 0.40-0.52 M.Y. FOR THREE DETERMINATIONS 15974 1 2.56 0.07 whole rock conventional K-Ar 7. 79ZZL1085 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.0287 27 age of volcanism AGES RANGE FROM 2.40-3.28 M.Y. FOR 3 DETERMINATIONS 15974 2 3.28 0.21 whole rock conventional K-Ar 7. 79ZZL1085 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.0368 17 age of volcanism AGES RANGE FROM 2.40-3.28 M.Y. FOR 3 DETERMINATIONS 15974 3 2.4 0.05 whole rock conventional K-Ar 7. 79ZZL1085 "4.962E-04, 0.581E-04, 1.1167E-04" 0.78 0.0269 14 age of volcanism AGES RANGE FROM 2.40-3.28 M.Y. FOR 3 DETERMINATIONS 15975 1 2.56 0.11 whole rock conventional K-Ar 8. 79ZM0086 "4.962E-04, 0.581E-04, 1.1167E-04" 1.32 0.0489 36 age of volcanism 15975 2 2.24 0.1 whole rock conventional K-Ar 8. 79ZM0086 "4.962E-04, 0.581E-04, 1.1167E-04" 1.32 0.0426 34 minimum age of volcanism 15976 1 6.25 0.39 whole rock conventional K-Ar 9. 79ZZL1089 "4.962E-04, 0.581E-04, 1.1167E-04" 0.26 0.0238 10 age of volcanism 15976 2 6.09 0.29 whole rock conventional K-Ar 9. 79ZZL1089 "4.962E-04, 0.581E-04, 1.1167E-04" 0.26 0.0231 14 minimum age of volcanism 15977 1 10.52 0.12 whole rock conventional K-Ar 10. 81MH14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.1449 56 age of volcanism 15977 2 10.54 0.11 whole rock conventional K-Ar 10. 81MH14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.1452 60 age of volcanism 15978 1 7.65 0.1 whole rock conventional K-Ar 11. 80CF0022A "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.0996 48 AGES RANGE FROM 7.65-9.64 M.Y. FOR 4 DETERMINATIONS 15978 2 9.64 0.11 whole rock conventional K-Ar 11. 80CF0022A "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.1256 68 AGES RANGE FROM 7.65-9.64 M.Y. FOR 4 DETERMINATIONS 15978 3 8.66 0.09 whole rock conventional K-Ar 11. 80CF0022A "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.1128 44 age of volcanism AGES RANGE FROM 7.65-9.64 M.Y. FOR 4 DETERMINATIONS 15978 4 9.63 0.07 whole rock conventional K-Ar 11. 80CF0022A "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.1255 48 age of volcanism AGES RANGE FROM 7.65-9.64 M.Y. FOR 4 DETERMINATIONS 15979 1 11.15 0.12 whole rock conventional K-Ar 12. 81MH21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.98 0.1581 67 age of volcanism 15979 2 11.32 0.12 whole rock conventional K-Ar 12. 81MH21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.98 0.1605 54 age of volcanism 15980 1 6.31 0.12 whole rock conventional K-Ar 13. 79LP1108 "4.962E-04, 0.581E-04, 1.1167E-04" 1.22 0.1108 53 age of volcanism 15980 2 6.11 0.22 whole rock conventional K-Ar 13. 79LP1108 "4.962E-04, 0.581E-04, 1.1167E-04" 1.22 0.1072 42 age of volcanism 15981 1 1.48 0.15 whole rock conventional K-Ar 14. 79LP1109 "4.962E-04, 0.581E-04, 1.1167E-04" 0.81 0.0172 14 age of intrusion 15981 2 1.3 0.13 whole rock conventional K-Ar 14. 79LP1109 "4.962E-04, 0.581E-04, 1.1167E-04" 0.81 0.0152 6 age of intrusion 15982 1 1.48 0.05 whole rock conventional K-Ar 15. 79RH1032 "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 0.0227 22 AGES RANGE FROM 1.09-1.48 M.Y. FOR 3 DETERMINATIONS 15982 2 1.09 0.06 whole rock conventional K-Ar 15. 79RH1032 "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 0.0168 19 AGES RANGE FROM 1.09-1.48 M.Y. FOR 3 DETERMINATIONS 15982 3 1.14 0.06 whole rock conventional K-Ar 15. 79RH1032 "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 0.0175 16 AGES RANGE FROM 1.09-1.48 M.Y. FOR 3 DETERMINATIONS 15983 1 5.44 0.19 whole rock conventional K-Ar 16. 82MH1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.55 0.0431 6 age of volcanism 15984 1 1.22 0.04 whole rock conventional K-Ar 17. 82MH2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.05 0.0184 8 age of volcanism 15984 2 1.02 0.04 whole rock conventional K-Ar 17. 82MH2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.05 0.0155 9 age of volcanism 15985 1 0.15 0.02 whole rock conventional K-Ar 18. 82MH12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.002 2 age of volcanism 15986 1 0.49 0.06 whole rock conventional K-Ar 19. 81MH10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.09 0.0077 5 AGES RANGE FROM 0.49-0.65 M.Y. FOR 3 DETERMINATIONS 15986 2 0.65 0.05 whole rock conventional K-Ar 19. 81MH10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.09 0.0101 16 AGES RANGE FROM 0.49-0.65 M.Y. FOR 3 DETERMINATIONS 15986 3 0.63 0.07 whole rock conventional K-Ar 19. 81MH10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.09 0.0098 9 AGES RANGE FROM 0.49-0.65 M.Y. FOR 3 DETERMINATIONS 15987 1 0.45 0.06 whole rock conventional K-Ar 20. 79ZZ1048 "4.962E-04, 0.581E-04, 1.1167E-04" 1.56 0.0102 5 minimum age of volcanism 15987 2 0.52 0.05 whole rock conventional K-Ar 20. 79ZZ1048 "4.962E-04, 0.581E-04, 1.1167E-04" 1.56 0.0116 8 age of volcanism 15988 1 0.42 0.04 whole rock conventional K-Ar 21. 81MH29 "4.962E-04, 0.581E-04, 1.1167E-04" 1.45 0.0089 7 age of volcanism 15988 2 0.36 0.03 whole rock conventional K-Ar 21. 81MH29 "4.962E-04, 0.581E-04, 1.1167E-04" 1.45 0.0075 9 minimum age of volcanism 15989 1 0.57 0.1 whole rock conventional K-Ar 22. 81MH28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.0079 12 AGES RANGE FROM 0.29-0.82 M.Y. FOR 4 DETERMINATIONS 15989 2 0.29 0.08 whole rock conventional K-Ar 22. 81MH28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.004 6 AGES RANGE FROM 0.29-0.82 M.Y. FOR 4 DETERMINATIONS 15989 3 0.82 0.13 whole rock conventional K-Ar 22. 81MH28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.0114 9 AGES RANGE FROM 0.29-0.82 M.Y. FOR 4 DETERMINATIONS 15989 4 0.57 0.05 whole rock conventional K-Ar 22. 81MH28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.0078 3 AGES RANGE FROM 0.29-0.82 M.Y. FOR 4 DETERMINATIONS 15990 1 8.75 0.18 whole rock conventional K-Ar 23. 79LH1058A "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.0846 27 age of intrusion 15990 2 8.6 0.14 whole rock conventional K-Ar 23. 79LH1058A "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.0832 27 age of intrusion 15991 1 5.26 0.44 plagioclase conventional K-Ar 24. 79IC2039A "4.962E-04, 0.581E-04, 1.1167E-04" 0.51 0.0387 6 age of intrusion 15992 1 158.84 5 hornblende conventional K-Ar 29 "4.72E-04, 0.584E-04, 1.19E-04*" 0.722 1.726 85 minimum age of intrusion K=0.599% 15993 1 166.76 5 hornblende conventional K-Ar 140 "4.72E-04, 0.585E-04, 1.19E-04*" 0.685 1.723 82 minimum age of intrusion K=0.569% 15994 1 166.32 5 hornblende conventional K-Ar 270 "4.72E-04, 0.585E-04, 1.19E-04*" 1.265 3.173 84 minimum age of intrusion K=1.05% 15995 1 181.21 5 hornblende conventional K-Ar 279 "4.72E-04, 0.585E-04, 1.19E-04*" 0.587 1.611 79 minimum age of intrusion K=0.487% 15996 1 159.51 4 biotite conventional K-Ar W-77 "4.72E-04, 0.585E-04, 1.19E-04*" 8.12 19.497 90 K=6.740% PROBABLY A REDUCED AGE 15997 1 134 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" minimum age of intrusion NO ANALYTICAL DATA GIVEN MAY BE A RESET AGE 15998 1 23.1 1 K feldspar conventional K-Ar 14. GW-2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.523 1.523 38 minimum age of intrusion K=3.771%; 40AR-RAD=0.006087 PPM 15999 1 15.6 0.7 biotite conventional K-Ar 15. R-8 "4.962E-04, 0.581E-04, 1.1167E-04" 7.223 1.637 35 age of intrusion K=5.996%; 40AR-RAD=0.006544 PPM 16000 1 56.5 2.3 K feldspar conventional K-Ar 2. AWL-7-83 "4.962E-04, 0.581E-04, 1.1167E-04" 3.226 2.674 64 minimum age of intrusion K=2.678%; 40AR-RAD=0.010687 PPM 16001 1 27 1.1 biotite conventional K-Ar 3. AWL-11-83 "4.962E-04, 0.581E-04, 1.1167E-04" 8.592 3.378 40 age of intrusion K=7.132%; 40AR-RAD=0.01350 PPM 16002 1 27.9 1.4 whole rock conventional K-Ar 1. AWL-2-82 "4.962E-04, 0.581E-04, 1.1167E-04" 1.737 0.7046 47 minimum age of intrusion K=1.442%; 40AR-RAD=0.002816 PPM 16003 1 23.8 1 biotite conventional K-Ar 4. VCK-83-NM-002 "4.962E-04, 0.581E-04, 1.1167E-04" 7.989 2.765 49 age of intrusion K=6.632%; 40AR-RAD=0.01105 PPM 16004 1 27.2 1.1 whole rock conventional K-Ar 5. VCK-82-NM-004 "4.962E-04, 0.581E-04, 1.1167E-04" 5.281 2.086 65 age of intrusion K=4.384%; 40AR-RAD=0.008339 PPM (THIS ROCK HAS A HIGH POTASSIUM VALUE--COMPILER) 16005 1 29.3 1.2 whole rock conventional K-Ar 6. VCK-82-NM-010 "4.962E-04, 0.581E-04, 1.1167E-04" 4.599 1.964 55 age of intrusion K=3.818%; 40AR-RAD=0.007849 PPM (THIS ROCK HAS A HIGH POTASSIUM VALUE--COMPILER) 16006 1 29.7 1.7 hornblende conventional K-Ar 7. VCK-82-NM-024 "4.962E-04, 0.581E-04, 1.1167E-04" 0.849 0.3663 18 age of intrusion K=0.705%; 40AR-RAD=0.001464 PPM 16007 1 23.9 1.2 whole rock conventional K-Ar 8. VCK-82-NM-048 "4.962E-04, 0.581E-04, 1.1167E-04" 1.829 0.6345 56 age of intrusion K=1.518%; 40AR-RAD=0.002536 PPM 16008 1 35.4 2.1 whole rock conventional K-Ar 9. VCK-82-NM-049 "4.962E-04, 0.581E-04, 1.1167E-04" 0.611 0.3158 23 age of intrusion 16009 1 9.4 0.7 whole rock conventional K-Ar 10. VCK-82-NM-050 "4.962E-04, 0.581E-04, 1.1167E-04" 1.529 0.2084 28 age of intrusion K=1.269%; 40AR-RAD=0.000833 PPM 16010 1 8 0.8 whole rock conventional K-Ar 11. VCK-82-NM-051 "4.962E-04, 0.581E-04, 1.1167E-04" 0.669 0.0773 14 age of intrusion K=0.555%; 40AR-RAD=0.000309 PPM 16011 1 14.5 0.9 whole rock conventional K-Ar 12. VCK-82-NM-056 "4.962E-04, 0.581E-04, 1.1167E-04" 1.535 0.3228 38 age of intrusion K=1.274%; 40AR-RAD=0.001290 PPM 16012 1 23.9 1.6 hornblende conventional K-Ar 13. VCK-82-NM-057 "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 0.2324 18 age of intrusion K=0.556%; 40AR-RAD=0.000929 PPM 16013 1 28.89 1 whole rock conventional K-Ar RHG "4.72E-04, 0.585E-04, 1.19E-04*" 3.89 1.631 35 minimum age of intrusion K=3.23%; 40AR-RAD=0.00652 PPM 16014 1 30.77 1 whole rock conventional K-Ar RD62-62 "4.72E-04, 0.585E-04, 1.19E-04*" 1.12 0.5004 25 minimum age of intrusion K=0.93%; 40AR-RAD=0.00200 PPM 16015 1 104.63 10 biotite conventional K-Ar RB62-190 "4.72E-04, 0.585E-04, 1.19E-04*" 2.42 3.753 13 minimum age of intrusion CHLORITIZED BIOTITE--LOW K VALUE K=2.01%; 40AR-RAD=0.0150 PPM 16015 2 113.79 25 biotite conventional K-Ar RD62-190 "4.72E-04, 0.585E-04, 1.19E-04*" 1.524 2.577 27 minimum age of intrusion CHLORITIZED BIOTITE (LOW K VALUE) K=1.265%; 40AR-RAD=0.0103 PPM 16016 1 128.56 6 whole rock conventional K-Ar CS-1 "4.72E-04, 0.585E-04, 1.19E-04*" 2.217 4.253 44 age of metamorphic crystallization K=1.84%; 40AR-RAD=0.0170 PPM 16017 1 141.73 10 whole rock conventional K-Ar 62-173 "4.72E-04, 0.585E-04, 1.19E-04*" 1.921 4.078 46 age of metamorphic crystallization K=1.595%; 40AR-RAD=0.0163 PPM. 16018 1 155.53 12 hornblende conventional K-Ar CB-14 "4.72E-04, 0.585E-04, 1.19E-04*" 1.102 2.577 66 age of intrusion K=0.915%; 40AR-RAD=0.0103 PPM 16019 1 134.17 15 amphiboles conventional K-Ar 62-82 "4.72E-04, 0.585E-04, 1.19E-04*" 0.0973 0.1952 29 age of intrusion K=0.0808%; 40AR-RAD=0.00078 PPM 16020 1 135 4 hornblende conventional K-Ar 65-60 "4.72E-04, 0.585E-04, 1.19E-04" 0.388 0.668 64 age of intrusion "(*), K=0.322%; 40AR-RAD=0.00267 PPM" 16021 1 144.87 7 biotite conventional K-Ar ERR-1 "4.72E-04, 0.585E-04, 1.19E-04*" 3.4333 7.456 46 minimum age of intrusion IMPURE BIOTITE?--LOW K VALUE--COMPILER) K=2.85%; 40AR-RAD=0.0298 PPM 16021 2 145 4 biotite conventional K-Ar ERR-1 "4.72E-04, 0.585E-04, 1.19E-04" 4.385 8.177 89 age of intrusion (IMPURE BIOTITE?--LOW K VALUE--COMPILER) "(*), K=3.64%; 40AR-RAD=0.03268 PPM" 16022 1 280.38 20 hornblende conventional K-Ar Q-11 "4.72E-04, 0.585E-04, 1.19E-04*" 1.1 4.804 24 K=0.91%; 40AR-RAD= 0.0192 PPM SPURIOUS DATE--TOO OLD 16023 1 150 4 whole rock conventional K-Ar 18-25-7 "4.72E-04, 0.585E-04, 1.19E-04*" 0.22 0.4954 40 age of volcanism K=0.18%; 40AR-RAD=0.00198 PPM 16024 1 290.78 25 hornblende conventional K-Ar 35-B "4.72E-04, 0.585E-04, 1.19E-04*" 0.223 1.013 6 age of intrusion K=0.185%; 40AR-RAD=0.00405 PPM 16025 1 219.36 5 whole rock conventional K-Ar 16-28-5 "4.72E-04, 0.585E-04, 1.19E-04*" 0.43 1.444 32 age of intrusion K=0.36%; 40AR-RAD=0.00577 PPM 16026 1 67.1 1.7 biotite conventional K-Ar 6. (SR6-73) "4.962E-04, 0.581E-04, 1.1167E-04" 8.81 8.871 77 minimum age of intrusion PLUTON MAY BE 90 M.Y. OLD 16027 1 78.7 2 biotite conventional K-Ar 7. (SR8-73) "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 11.099 94 minimum age of intrusion PLUTON MAY BE 90 M.Y. OLD 16028 1 74.8 1.9 biotite conventional K-Ar 8. (SR9-73) "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 10.307 70 minimum age of intrusion PLUTON MAY BE 90 M.Y. OLD 16029 1 71.1 1.8 biotite conventional K-Ar 10. (SR11-73) "4.962E-04, 0.581E-04, 1.1167E-04" 7.22 7.722 75 minimum age of intrusion PLUTON MAY BE 90 M.Y. OLD 16030 1 18.2 0.5 biotite conventional K-Ar 15. (SR17-73) "4.962E-04, 0.581E-04, 1.1167E-04" 8.77 2.367 50 age not evaluated PROBABLY A SPURIOUS AGE; PLUTON MAY BE 90 M.Y. OLD 16030 2 74.2 1.9 hornblende conventional K-Ar 17. (SR17-73) "4.962E-04, 0.581E-04, 1.1167E-04" 1.62 1.812 44 minimum age of intrusion PLUTON MAY BE 90 M.Y. OLD 16031 1 139.5 3.5 biotite conventional K-Ar 17. (SR19-73) "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 18.44 91 age of intrusion 16031 2 127.4 8 hornblende conventional K-Ar 17. (SR19-73) "4.962E-04, 0.581E-04, 1.1167E-04" 0.55 1.072 28 minimum age of intrusion 16032 1 74.8 1.9 biotite conventional K-Ar 18. (SR20-73) "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 9.548 87 minimum age of intrusion PLUTON MAY BE AROUND 180 M.Y. OLD 16033 1 112.7 2.8 biotite conventional K-Ar 27. (C-203) "4.962E-04, 0.581E-04, 1.1167E-04" 8.11 13.898 79 age of intrusion 16034 1 89 2.3 biotite conventional K-Ar 28. (C-204) "4.962E-04, 0.581E-04, 1.1167E-04" 6.9 9.283 92 minimum age of intrusion MAY BE A REDUCED AGE 16035 1 13.5 0.7 whole rock conventional K-Ar 5. CH82-9 "4.962E-04, 0.581E-04, 1.1167E-04" 1.406 0.2733 82 age of intrusion 16036 1 14.4 0.8 whole rock conventional K-Ar 6. CH82-11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.714 0.3577 51 age of intrusion 16037 1 19.6 0.9 whole rock conventional K-Ar 7. CH82-13 "4.962E-04, 0.581E-04, 1.1167E-04" 3.428 0.972 85 age of volcanism 16038 1 12.4 0.7 whole rock conventional K-Ar 22. CH82-61 "4.962E-04, 0.581E-04, 1.1167E-04" 1.515 0.2715 65 minimum age of volcanism 16038 2 15.9 0.8 whole rock conventional K-Ar 22. CH82-61 "4.962E-04, 0.581E-04, 1.1167E-04" 1.515 0.3483 68 age of volcanism 16039 1 15.9 0.9 whole rock conventional K-Ar 1. CH83-3A "4.962E-04, 0.581E-04, 1.1167E-04" 0.677 0.1559 36 age of volcanism 16040 1 14.3 0.9 whole rock conventional K-Ar 8. CH82-17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.401 0.146 43 16041 1 13.3 0.6 whole rock conventional K-Ar 17. H9-47 "4.962E-04, 0.581E-04, 1.1167E-04" 0.963 0.1851 77 age of volcanism 16041 2 15 0.9 whole rock conventional K-Ar 17. H9-47 "4.962E-04, 0.581E-04, 1.1167E-04" 0.963 0.283 25 maximum age of volcanism LOW PERCENT-RADIOGENIC VALUE 16042 1 12.2 1.3 whole rock conventional K-Ar 18. CH82-26 "4.962E-04, 0.581E-04, 1.1167E-04" 1.537 0.2717 10 age of volcanism 16043 1 27.7 1.4 whole rock conventional K-Ar 19. CH82-34 "4.962E-04, 0.581E-04, 1.1167E-04" 1.884 0.7582 89 age of volcanism 16044 1 15.7 0.7 whole rock conventional K-Ar 19. CH82-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.2163 60 age of volcanism 16044 2 16.5 0.8 whole rock conventional K-Ar 19. CH82-32 "4.962E-04, 0.581E-04, 1.1167E-04" 0.95 0.2267 53 age of volcanism 16045 1 13.5 1 whole rock conventional K-Ar 20. CH82-42 "4.962E-04, 0.581E-04, 1.1167E-04" 0.39 0.0761 34 age of volcanism 16046 1 16.6 0.9 whole rock conventional K-Ar 2. CH83-4A "4.962E-04, 0.581E-04, 1.1167E-04" 1.4 0.3368 59 age of volcanism 16047 1 15.4 1 whole rock conventional K-Ar 3. CH83-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1 0.222 29 age of volcanism 16048 1 11.4 0.9 whole rock conventional K-Ar 9. CH83-22 "4.962E-04, 0.581E-04, 1.1167E-04" 1.551 0.2446 16 age of volcanism 16048 2 11.3 0.9 whole rock conventional K-Ar 9. CH83-22 "4.962E-04, 0.581E-04, 1.1167E-04" 1.551 0.254 17 age of volcanism 16049 1 14.5 1.1 whole rock conventional K-Ar 21. CH82-58 "4.962E-04, 0.581E-04, 1.1167E-04" 1.223 0.2568 19 minimum age of intrusion 16050 1 12.7 0.8 whole rock conventional K-Ar 23. CH82-65B "4.962E-04, 0.581E-04, 1.1167E-04" 0.669 0.1229 55 age of volcanism 16051 1 11.9 0.7 whole rock conventional K-Ar 4. CH82-20A "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.1037 28 age of volcanism 16051 2 12.5 0.7 whole rock conventional K-Ar 4. CH82-20A "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.1091 26 age of volcanism 16052 1 14.8 0.8 whole rock conventional K-Ar 10. CH82-23A "4.962E-04, 0.581E-04, 1.1167E-04" 0.616 0.1319 53 age of volcanism 16053 1 23.7 1.3 whole rock conventional K-Ar 11. CH82-24A "4.962E-04, 0.581E-04, 1.1167E-04" 1.99 0.6839 57 age of volcanism 16054 1 18.1 1.1 whole rock conventional K-Ar 11. CH82-24E "4.962E-04, 0.581E-04, 1.1167E-04" 0.586 0.1537 45 age of volcanism 16055 1 14.8 0.8 whole rock conventional K-Ar 12. CH83-60B "4.962E-04, 0.581E-04, 1.1167E-04" 0.592 0.1265 48 age of volcanism 16056 1 17 1.1 whole rock conventional K-Ar 12. CH83-60F "4.962E-04, 0.581E-04, 1.1167E-04" 0.41 0.101 51 age of volcanism 16057 1 17.3 1 whole rock conventional K-Ar 13. CH83-59 "4.962E-04, 0.581E-04, 1.1167E-04" 0.56 0.1298 47 age of volcanism 16058 1 11.3 0.8 whole rock conventional K-Ar 14. CH83-55 "4.962E-04, 0.581E-04, 1.1167E-04" 1.093 0.1786 28 age of volcanism 16059 1 11.5 0.7 whole rock conventional K-Ar 15. CH83-48 "4.962E-04, 0.581E-04, 1.1167E-04" 1.186 0.197 47 age of volcanism 16060 1 11.9 0.7 whole rock conventional K-Ar 16. CH83-41 "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 0.1404 36 age of volcanism 16132 1 1210 30 plagioclase 39Ar-40Ar incremental (plateau) L-2-1905 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism NO ANALYTICAL DATA GIVEN 16133 1 plagioclase 39Ar-40Ar incremental (plateau) SCH-1-3200 "4.962E-04, 0.581E-04, 1.1167E-04" 40-39AR RELEASE PATTERN WAS VERY COMPLICATED; NO PLATEAU AGE DETERMINED; NO ANALYTICAL DATA GIVEN ROCK ESTIMATED TO BE 1300-1400 M.Y. OLD 16134 1 1238 30 plagioclase 39Ar-40Ar incremental (plateau) PKM-98-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion NO ANALYTICAL DATA GIVEN 16135 1 K feldspar 39Ar-40Ar incremental (plateau) FQ-50-1 no decay constants given 40-39AR RELEASE PATTERN NOT DIFINITIVE; NO ANALYTICAL DATA GIVEN PLUTON IS PROBABLY AROUND 1240 M.Y. OLD 16136 1 plagioclase FQ-11-2 no decay constants given NO ANALYTICAL DATA GIVEN; 40-39AR RELEASE PATTERN WAS STRANGE THIS ROCK IS PROBABLY AROUND 1240 M.Y. OLD 16137 1 plagioclase 39Ar-40Ar incremental (plateau) FQ-95-1 no decay constants given 40-39AR RELEASE PATTERN NOT DEFINITIVE; NO ANALYTICAL DATA GIVEN PLUTON IS PROBABLY AROUND 1240 M.Y. OLD 16138 1 0.96 0.03 whole rock conventional K-Ar SM-79-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.18 0.0302 15 age of volcanism 16139 1 1.1 0.04 whole rock conventional K-Ar SM-79-2 "4.962E-04, 0.581E-04, 1.1167E-04" 2.55 0.0404 30 age of volcanism 16140 1 0.81 0.05 whole rock conventional K-Ar SM-79-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.955 0.0111 8 age of volcanism 16143 1 0.07 0.01 whole rock conventional K-Ar 76G031 "4.962E-04, 0.581E-04, 1.1167E-04" 1.104 52 age of volcanism AVERAGE OF 2 DETERMINATIONS--0.086 AND 0.046 M.Y. 16144 1 0.54 0.1 whole rock conventional K-Ar 76G032 "4.962E-04, 0.581E-04, 1.1167E-04" 0.628 23 age of volcanism AVERAGE OF 2 DETERMINATIONS--0.622 AND 0.553 M.Y. 16190 1 1127 hornblende 39Ar-40Ar total fusion GM-1H "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of metamorphic crystallization TOTAL-GAS 40-39AR AGE; SEE ARTICLE FOR ANALYTICAL DATA GNEISS PROBABLY FORMED DURING THE GRENVILLE OROGENY 16191 1 928 hornblende 39Ar-40Ar total fusion GM-1B "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling TOTAL-GAS 40-39AR AGE; SEE ARTICLE FOR ANALYTICAL DATA GNEISS PROBABLY FORMED DURING THE GRENVILLE OROGENY 16191 2 837.9 8.1 biotite 39Ar-40Ar incremental (plateau) GM-1B "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling 40-39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA; TOTAL GAS AGE IS 795 M.Y. GNEISS PROBABLY FORMED DURING THE GRENVILLE OROGENY 16192 1 916.5 8.8 hornblende 39Ar-40Ar incremental (plateau) GM-2H "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL GAS AGE IS 995 M.Y." GNEISS PROBABLY FORMED DURING THE GRENVILLE OROGENY 16192 2 788.8 5.1 biotite 39Ar-40Ar incremental (plateau) GM-2B "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 789 M.Y." GNEISS PROBABLY FORMED DURING THE GRENVILLE OROGENY 16193 1 717.1 6.2 biotite 39Ar-40Ar incremental (plateau) GM-2G "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 709 M.Y." GNEISS PROBABLY FORMED DURING THE GRENVILLE OROGENY 16194 1 436.5 4.1 biotite 39Ar-40Ar incremental (plateau) GM-4 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 435 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16195 1 446.5 4.2 biotite 39Ar-40Ar incremental (plateau) GM-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 443 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16196 1 355.2 4.8 hornblende 39Ar-40Ar incremental (plateau) GM-20 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 342 M.Y." AMPHIBOLITE WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16197 1 368.5 4.3 hornblende 39Ar-40Ar incremental (plateau) GM-26 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 379 M.Y." AMPHIBOLITE WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16198 1 376.1 5 hornblende 39Ar-40Ar incremental (plateau) GM-28H "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 384 M.Y." AMPHIBOLITE WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16198 2 377.3 4.2 biotite 39Ar-40Ar incremental (plateau) GM-28B "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 371 M.Y." AMPHIBOLITE WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16199 1 363 2.7 biotite 39Ar-40Ar incremental (plateau) GM-29 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 362 M.Y." GNEISS WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16200 1 379.6 4.2 biotite 39Ar-40Ar incremental (plateau) BM-4 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 372 M.Y." GNEISS WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16201 1 362.9 4.1 biotite 39Ar-40Ar incremental (plateau) BM-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 360 M.Y." GNEISS WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16202 1 351 2.7 biotite 39Ar-40Ar incremental (plateau) BM-6 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 340 M.Y." GNEISS WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16203 1 356.5 3.8 biotite 39Ar-40Ar incremental (plateau) BM-7 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 356 M.Y." GNEISS WAS INVOLVED IN THE ACADIAN OROGENY--376 M.Y. AGO 16204 1 421.6 4.6 biotite 39Ar-40Ar incremental (plateau) BM-10H "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 413 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16205 1 466.5 5.1 hornblende 39Ar-40Ar incremental (plateau) BM-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 503 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16206 1 446.6 6.2 hornblende 39Ar-40Ar incremental (plateau) BM-12 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 480 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16207 1 397.7 3 biotite 39Ar-40Ar incremental (plateau) BM-16B "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 394 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16207 2 415.4 4.6 hornblende 39Ar-40Ar incremental (plateau) BM-16H "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 415 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16208 1 402.1 4.4 biotite 39Ar-40Ar incremental (plateau) BM-14LB "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 398 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16208 2 404 4.5 hornblende 39Ar-40Ar incremental (plateau) BM-14 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 407 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16209 1 406.2 4.5 hornblende 39Ar-40Ar incremental (plateau) BM-19 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 411 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16210 1 364.2 4.1 hornblende 39Ar-40Ar incremental (plateau) BM-13 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling "40-39AR PLATEAU AGE, SEE ARTICLE FOR ANALYTICAL DATA; TOTAL-GAS AGE IS 363 M.Y." GNEISS WAS INVOLVED IN THE TACONIC OROGENY--465 M.Y. AGO 16211 1 403 14 muscovite conventional K-Ar PW21-4 "4.962E-04, 0.581E-04, 1.1167E-04" 3.784 24.61 81 age of uplift and cooling -200 MESH FRACTION K=3.141%; 40AR-RAD=0.09836 PPM PHYLLITE MAY HAVE FORMED ABOUT 465 M.Y. AGO 16212 1 443 16 muscovite conventional K-Ar PW21-12 "4.962E-04, 0.581E-04, 1.1167E-04" 5.138 37.13 82 age of uplift and cooling (-200 MESH FRACTION) K=4.265%; 40AR-RAD=0.1484 PPM 16213 1 375 13 muscovite conventional K-Ar PW13-47 "4.962E-04, 0.581E-04, 1.1167E-04" 7.079 42.51 86 age of uplift and cooling (-200 MESH FRACTION) K=7.079%; 40AR-RAD=0.1699 PPM 16214 1 395 14 biotite conventional K-Ar WT-86 "4.962E-04, 0.581E-04, 1.1167E-04" 7.599 48.36 91 age of uplift and cooling K=6.308%; 40AR-RAD=0.1933 PPM 16215 1 414 15 biotite conventional K-Ar EL-15 "4.962E-04, 0.581E-04, 1.1167E-04" 9.027 60.57 71 age of uplift and cooling K=7.493%; 40AR-RAD=0.2421 PPM 16216 1 13.9 0.4 plagioclase conventional K-Ar DT81A3 (69A172) "4.72E-04, 0.585E-04, 1.19E-04" 0.0256 20 age of volcanism 16217 1 15.6 0.6 plagioclase conventional K-Ar DT81D1 (70A94) "4.72E-04, 0.585E-04, 1.19E-04" 0.0189 6 age of volcanism 16218 1 15.2 0.4 plagioclase conventional K-Ar DT89A3 (70A91) "4.72E-04, 0.585E-04, 1.19E-04*" 0.128 0.0281 40 age of volcanism 16219 1 14.6 0.7 plagioclase conventional K-Ar DT89A4 (70A92) "4.72E-04, 0.585E-04, 1.19E-04" 0.0262 30 age of volcanism 16220 1 15.5 0.8 plagioclase conventional K-Ar DT89A5 (70A93) "4.72E-04, 0.585E-04, 1.19E-04" 0.0254 8 age of volcanism 16268 1 3.88 0.09 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.354 0.1317 68 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44." 16269 1 3.86 0.12 whole rock conventional K-Ar 1A "4.962E-04, 0.581E-04, 1.1167E-04" 1.725 0.096 66 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16269 2 3.83 0.12 whole rock conventional K-Ar 1AR "4.962E-04, 0.581E-04, 1.1167E-04" 1.725 0.0952 66 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16270 1 6.47 0.18 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.994 0.1861 56 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16271 1 7.55 0.17 whole rock conventional K-Ar 2A "4.962E-04, 0.581E-04, 1.1167E-04" 1.414 0.154 63 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44." 16272 1 4.48 0.15 whole rock conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.972 0.1274 42 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44." 16273 1 4.24 0.17 whole rock conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 2.296 0.1406 66 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16274 1 0.33 0.05 whole rock conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 1.927 0.0092 11 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHER, 1985, ISOCHRON/WEST, NO. 44" 16275 1 0.56 0.08 whole rock conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.076 0.0087 20 age of volcanism "THIS AGE ALSO REPORTED BY WELLS AND OTHERS, 1985, GSA BULL., V. 96, P. 1518-1529 AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44." 16276 1 0.58 0.16 whole rock conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 1.762 0.0146 6 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16277 1 0.17 0.06 whole rock conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 1.934 0.0046 3 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16278 1 0.16 0.04 whole rock conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 2.118 0.0047 4 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16278 2 0.17 0.04 whole rock conventional K-Ar 14R "4.962E-04, 0.581E-04, 1.1167E-04" 2.118 0.0052 6 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, ISOCHRON/WEST, NO. 44" 16279 1 0.32 0.09 whole rock conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 1.724 0.0077 3 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16280 1 0.13 0.06 whole rock conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.849 0.0341 2 age of volcanism "THIS AGE LISTED AS 0.14+/-0.04 M.Y. BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529. AGE OF 0.13 M.Y. ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44." 16281 1 0.46 0.08 whole rock conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 2.049 0.0138 6 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529 AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44." 16282 1 0.63 0.11 whole rock conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 1.882 0.017 15 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16283 1 0.75 0.22 whole rock conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 1.896 0.0206 8 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529 AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16284 1 0.39 0.08 whole rock conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 2.079 0.0117 3 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529 AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16285 1 0.06 0.03 whole rock conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 2.148 0.0019 3 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529 AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16286 1 0.33 0.03 whole rock conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 2.019 0.0097 8 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16287 1 0.99 0.07 whole rock conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 1.596 0.0227 5 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529, AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16288 1 0.33 0.16 whole rock conventional K-Ar 36 "4.962E-04, 0.581E-04, 1.1167E-04" 1.628 0.0078 2 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1984, ISOCHRON/WEST, NO. 44" 16289 1 0.25 0.05 whole rock conventional K-Ar 37 "4.962E-04, 0.581E-04, 1.1167E-04" 1.917 0.0069 4 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529, AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16290 1 0.67 0.13 whole rock conventional K-Ar 40 "4.962E-04, 0.581E-04, 1.1167E-04" 1.827 0.0177 8 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16291 1 0.27 0.1 whole rock conventional K-Ar 41 "4.962E-04, 0.581E-04, 1.1167E-04" 1.927 0.0074 2 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16291 2 0.26 0.12 whole rock conventional K-Ar 41R "4.962E-04, 0.581E-04, 1.1167E-04" 1.927 0.0072 2 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16292 1 0.27 0.07 whole rock conventional K-Ar 42 "4.962E-04, 0.581E-04, 1.1167E-04" 1.906 0.0073 3 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16293 1 0.32 0.02 whole rock conventional K-Ar 43 "4.962E-04, 0.581E-04, 1.1167E-04" 1.943 0.009 12 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16294 1 0.27 0.05 whole rock conventional K-Ar 51 "4.962E-04, 0.581E-04, 1.1167E-04" 1.843 0.007 3 age of volcanism "THIS AGE ALSO REPORTED BY WELLS ETAL., 1985, GSA BULL., V. 96, P. 1518-1529, AND BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16295 1 0.7 0.06 whole rock conventional K-Ar 55 "4.962E-04, 0.581E-04, 1.1167E-04" 1.915 0.0193 7 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16296 1 0.17 0.04 whole rock conventional K-Ar 56 "4.962E-04, 0.581E-04, 1.1167E-04" 1.836 0.0045 5 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16297 1 3.64 0.16 whole rock conventional K-Ar 59 "4.962E-04, 0.581E-04, 1.1167E-04" 1.721 0.0902 62 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16298 1 0.85 0.05 whole rock conventional K-Ar 62 "4.962E-04, 0.581E-04, 1.1167E-04" 1.689 0.0207 30 age of volcanism "AGE ALSO LISTED BY TURRIN AND OTHERS, 1985, ISOCHRON/WEST, NO. 44" 16308 1 1342 10 muscovite conventional K-Ar 67-MC-82 "4.962E-04, 0.581E-04, 1.1167E-04" 300 99 minimum age of metamorphic crystallization 16309 1 1357 10 muscovite conventional K-Ar 67-MC-84 "4.962E-04, 0.581E-04, 1.1167E-04" 305 89 minimum age of metamorphic crystallization 16310 1 1681 12 hornblende conventional K-Ar 72-MC-130C "4.962E-04, 0.581E-04, 1.1167E-04" 22.6 90 age of metamorphic crystallization 16311 1 78.3 2.9 whole rock conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 9.107 7683 age of volcanism "K=6.419, 6.340%; 40AR-RAD=0.03578 AND 0.03702PPM" THIS IS A MINIMUM AGE; MATERIAL IS SOMEWHAT ALTERED 16312 1 91.3 3.4 biotite conventional K-Ar (NOT GIVEN) "4.72E-04, 0.585E-04, 1.19E-04" 9.94 6368 age of volcanism "K=5.950, 5.950%; 40AR-RAD=0.03777 AND 0.04170 PPM" 16313 1 0.3 0.12 whole rock conventional K-Ar 7572317-A "4.962E-04, 0.581E-04, 1.1167E-04" 1.422 0.006 3 WEIGHTED MEAN OF 5 AGE DETERMINATIONS IS 0.053+/-0.044 M.Y. 16314 1 0.1 0.12 whole rock conventional K-Ar 7572317-B "4.962E-04, 0.581E-04, 1.1167E-04" 1.264 0.0019 1 WEIGHTED MEAN OF 5 AGE DETERMINATIONS IS 0.053+/-0.044 M.Y. 16315 1 0.09 0.12 whole rock conventional K-Ar 509-49-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.653 0.0022 1 WEIGHTED MEAN OF 5 AGE DETERMINATIONS IS 0.053+/-0.044 M.Y. 16315 2 0.06 0.07 whole rock conventional K-Ar 509-49-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.653 0.0014 1 WEIGHTED MEAN OF 5 AGE DETERMINATIONS IS 0.053+/-0.044 M.Y. 16316 1 124 8 hornblende conventional K-Ar C80-14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.151 0.2774 24 minimum age of intrusion K=0.125% 16317 1 107 5 hornblende conventional K-Ar F80-6A "4.962E-04, 0.581E-04, 1.1167E-04" 1 1.5921 33 minimum age of metamorphic crystallization IMPURE HORNBLENDE SEPARATE K=0.830% 16318 1 135 6 hornblende conventional K-Ar C80-43B "4.962E-04, 0.581E-04, 1.1167E-04" 0.16 0.3224 41 minimum age of intrusion 16319 1 121 8 hornblende conventional K-Ar C80-28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.17 0.3069 23 minimum age of metamorphic crystallization 16320 1 191 7 hornblende conventional K-Ar W80-25B "4.962E-04, 0.581E-04, 1.1167E-04" 0.27 0.7821 57 minimum age of intrusion 16321 1 194 7 hornblende conventional K-Ar W80-48 "4.962E-04, 0.581E-04, 1.1167E-04" 0.16 0.4719 49 minimum age of intrusion 16322 1 189 8 hornblende conventional K-Ar W80-17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.249 0.7167 44 minimum age of intrusion 16371 1 158.66 3 biotite conventional K-Ar 1. (KA840) "4.72E-04, 0.585E-04, 1.19E-04*" 6.14 14.66 75 age of intrusion 16372 1 165.65 4 biotite conventional K-Ar 2. (KA902) "4.72E-04, 0.585E-04, 1.19E-04*" 6.75 16.86 86 age of intrusion 16373 1 4.4 0.2 biotite conventional K-Ar 3. (6I091) "4.72E-04, 0.585E-04, 1.19E-04*" 7.3 0.462 28 age of volcanism 16374 1 3.6 0.2 sanidine conventional K-Ar 4. (6I090) "4.72E-04, 0.585E-04, 1.19E-04*" 9.2 0.48 62 minimum age of volcanism 16375 1 5.8 0.2 biotite conventional K-Ar 6I021 "4.72E-04, 0.585E-04, 1.19E-04*" 5.3 0.447 26 age of volcanism 16397 1 47.1 5.6 plagioclase conventional K-Ar 1. (L-73-1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.1784 44 minimum age of volcanism ANALYTICAL DATA OBTAINED FROM R.F. MARVIN (USGS)--COMPILER 16397 2 50.8 1.7 sanidine conventional K-Ar 1. (L-73-1) "4.962E-04, 0.581E-04, 1.1167E-04" 6.551 76 age of volcanism ANALYTICAL DATA OBTAINED FROM R.F. MARVIN (USGS)--COMPILER 16398 1 50.3 3.1 plagioclase conventional K-Ar 2. (L-73-5) "4.962E-04, 0.581E-04, 1.1167E-04" 0.5493 41 age of volcanism ANALYTICAL DATA OBTAINED FROM R.F. MARVIN (USGS)--COMPILER 16398 2 46.4 1.5 whole rock conventional K-Ar 2. (L-73-5) "4.962E-04, 0.581E-04, 1.1167E-04" 2.093 83 minimum age of volcanism GROUNDMASS THAT FLOATED IN BROMOFORM ANALYTICAL DATA OBTAINED FROM R.F. MARVIN (USGS)--COMPILER 16399 1 43.5 3 plagioclase conventional K-Ar 3. (L-72-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.2718 47 minimum age of volcanism ANALYTICAL DATA OBTAINED FROM R.F. MARVIN (USGS)--COMPILER LATITE IS PROBABLY 48-50 M.Y. OLD 16399 2 72.4 12.8 hornblende conventional K-Ar 3. (L-72-2) "4.962E-04, 0.581E-04, 1.1167E-04" 0.1485 34 ANALYTICAL DATA OBTAINED FROM R.F. MARVIN (USGS)--COMPILER "SPURIOUS AGE, LATITE IS PROBABLY 48-50 M.Y. OLD." 16450 1 105 6 hornblende conventional K-Ar B-0377 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16451 1 136 5 biotite conventional K-Ar B-0306 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16452 1 128 5 biotite conventional K-Ar B-0299 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16453 1 109 4 biotite conventional K-Ar B-0298 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16454 1 77 15 plagioclase conventional K-Ar F-0384 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16455 1 126 7 biotite conventional K-Ar B-0378 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16456 1 62.9 1.8 biotite conventional K-Ar B-0379 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16457 1 18.8 1.2 biotite conventional K-Ar B-0297 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16458 1 159 15 chlorite group conventional K-Ar B-0296 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16459 1 168 15 tremolite conventional K-Ar A-0385 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16460 1 76 2 biotite conventional K-Ar B-0295 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16461 1 27.5 2.5 biotite conventional K-Ar B-0382 "4.72E-04, 0.585E-04, 1.19E-04" age of volcanism NO ANALYTICAL DATA GIVEN 16462 1 163 7 biotite conventional K-Ar B-0304 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16463 1 98.5 4 biotite conventional K-Ar B-0303 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16464 1 70.3 3 biotite conventional K-Ar B-0302 "4.72E-04, 0.585E-04, 1.19E-04" age not evaluated NO ANALYTICAL DATA GIVEN 16465 1 26.48 1.1 muscovite conventional K-Ar PED-4-58 "4.76E-04, 0.589E-04, 1.18E-04*" 9.61 3.69 46 age of uplift and cooling K=7.98% 16466 1 0.01 0 sanidine conventional K-Ar 5G201 "4.72E-04, 0.585E-04, 1.19E-04" 0.0012 24 age of volcanism 16466 2 0.01 0 sanidine conventional K-Ar 5G201 "4.72E-04, 0.585E-04, 1.19E-04" 0.0011 9 age of volcanism 16467 1 30.19 0.9 muscovite conventional K-Ar PED-4A-58 "4.76E-04, 0.589E-04, 1.18E-04*" 10.06 4.41 73 age of uplift and cooling K=8.35% 16467 2 25.39 1 biotite conventional K-Ar PED-4A-58 "4.76E-04, 0.589E-04, 1.18E-04*" 8.53 3.14 48 age of uplift and cooling K=7.08% 16468 1 24.83 1 muscovite conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 8.85 3.185 1166 age of uplift and cooling "K=7.35%, 40AR-RAD=3.03 AND 3.34XE-10 MOL/GM" 16468 2 25.65 1 biotite conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 6.91 2.57 66 age of uplift and cooling K=5.74% 16468 3 27.5 0.8 K feldspar conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 13.36 5.33 94 age of uplift and cooling K=11.09% 16468 4 29.95 1 plagioclase conventional K-Ar PED-18-62L "4.76E-04, 0.589E-04, 1.18E-04*" 3.22 1.4 76 age of uplift and cooling PLAGIOCLASE SPECIFIC GRAVITY 2.580-2.630; 3% QUARTZ PRESENT K=2.67% 16470 1 28.25 0.9 biotite conventional K-Ar PED-18-62D "4.76E-04, 0.589E-04, 1.18E-04*" 9.22 3.78 74 age of uplift and cooling K=7.65% 16471 1 27.66 1 muscovite conventional K-Ar PED-29-60 "4.76E-04, 0.589E-04, 1.18E-04*" 10.34 4.15 54 age of uplift and cooling K=8.58% 16472 1 76.3 2.7 sanidine conventional K-Ar 3. DMT80-60 "4.962E-04, 0.581E-04, 1.1167E-04" 8.467 96 age of volcanism 16473 1 33.5 1.1 muscovite conventional K-Ar PED-30-60 "4.76E-04, 0.589E-04, 1.18E-04*" 10.56 5.14 68 K=8.77% THIS IS PROBABLY A COOLING AGE 16474 1 47.88 2.1 muscovite conventional K-Ar PED-15-59 "4.76E-04, 0.589E-04, 1.18E-04*" 10.05 7.02 42 minimum age of intrusion K=8.34% 16475 1 77.2 2.8 sanidine conventional K-Ar 1. DMT80-66 "4.962E-04, 0.581E-04, 1.1167E-04" 7.949 85 age of volcanism 16476 1 77.3 2.9 sanidine conventional K-Ar 2. DMT80-64 "4.962E-04, 0.581E-04, 1.1167E-04" 8.386 94 age of volcanism 16477 1 300 5 muscovite 39Ar-40Ar incremental (plateau) 1 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 394 M.Y. OLD 16481 1 263 5 biotite 39Ar-40Ar incremental (plateau) 5 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 394 M.Y. OLD 16482 1 273 5 biotite 39Ar-40Ar incremental (plateau) 6 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE PLUS POSSIBLE DEUTERIC EFFECTS; PLUTON IS 394 M.Y. OLD. 16485 1 296 5 muscovite 39Ar-40Ar incremental (plateau) 8 "4.962E-04, 0.581E-04, 1.1167E-04" A 40-39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; PLUTON IS 394 M.Y. OLD. 16488 1 306 5 biotite 39Ar-40Ar incremental (plateau) 11 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 381 M.Y. OLD 16489 1 297 5 biotite 39Ar-40Ar incremental (plateau) 12 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 381 M.Y. OLD 16493 1 301 5 muscovite 39Ar-40Ar incremental (plateau) 16 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 381 M.Y. OLD 16493 2 297 5 biotite 39Ar-40Ar incremental (plateau) 16 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 381 M.Y. OLD 16494 1 352 5 hornblende 39Ar-40Ar incremental (plateau) 17 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 381 M.Y. OLD 16496 1 288 5 muscovite 39Ar-40Ar incremental (plateau) 19 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE; STOCK IS 387 M.Y. OLD 16496 2 278 5 biotite 39Ar-40Ar incremental (plateau) 19 "4.962E-04, 0.581E-04, 1.1167E-04" A 40/39AR PLATEAU AGE; SEE ARTICLE FOR ANALYTICAL DATA A COOLING AGE PLUS POSSIBLE EFFECTS FROM DEUTERIC ALTERATION; STOCK IS 387 M.Y. OLD 16500 1 1.56 0.05 whole rock conventional K-Ar UAKA82-190 "4.962E-04, 0.581E-04, 1.1167E-04" 2.471 0.0553 60 age of volcanism groundmass only 16501 1 1.3 0.05 whole rock conventional K-Ar UAKA82-191 "4.962E-04, 0.581E-04, 1.1167E-04" 0.959 0.0179 55 age of volcanism groundmass only 16502 1 1.19 0.04 whole rock conventional K-Ar UAKA82-192 "4.962E-04, 0.581E-04, 1.1167E-04" 1.687 0.0289 66 age of volcanism groundmass only 16503 1 0.67 0.02 whole rock conventional K-Ar UAKA82-197 "4.962E-04, 0.581E-04, 1.1167E-04" 1.805 0.0174 67 age of volcanism groundmass only 16504 1 1.05 0.04 whole rock conventional K-Ar UAKA82-193 "4.962E-04, 0.581E-04, 1.1167E-04" 2.142 0.0322 55 age of volcanism groundmass only 16505 1 1.98 0.6 whole rock conventional K-Ar UAKA82-194 "4.962E-04, 0.581E-04, 1.1167E-04" 1.27 0.0363 52 age of volcanism groundmass only 16506 1 0.31 0.07 whole rock conventional K-Ar UAKA82-195 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9765 0.0043 95 age of volcanism groundmass only 16507 1 1.04 0.05 whole rock conventional K-Ar UAKA82-196 "4.962E-04, 0.581E-04, 1.1167E-04" 2.754 0.0413 67 age of volcanism groundmass only 16508 1 44.27 2.6 hornblende conventional K-Ar 1 "4.72E-04, 0.585E-04, 1.19E-04*" 0.685 0.442 70 age of volcanism 16509 1 62 1.8 biotite conventional K-Ar 75089 "4.72E-04, 0.585E-04, 1.19E-04*" 7.504 6.8198 84 age of intrusion 16510 1 60.7 1.8 biotite conventional K-Ar 75092 "4.72E-04, 0.585E-04, 1.19E-04*" 8.248 7.3335 92 age of intrusion 16511 1 60.2 1.8 biotite conventional K-Ar 75088 "4.72E-04, 0.585E-04, 1.19E-04*" 6.51 5.7404 90 age of intrusion 16512 1 59.2 1.8 biotite conventional K-Ar 75086 "4.72E-04, 0.585E-04, 1.19E-04*" 6.339 5.4958 91 age of intrusion 16513 1 37.61 1 biotite conventional K-Ar PW-1 "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 4.388 61 age of intrusion 16514 1 36.37 0.9 biotite conventional K-Ar PW-2 "4.72E-04, 0.585E-04, 1.19E-04*" 8.19 4.332 59 age of intrusion 16515 1 37.1 1 biotite conventional K-Ar PW-8 "4.72E-04, 0.585E-04, 1.19E-04*" 8.26 4.457 81 age of intrusion 16515 2 35.32 1.2 hornblende conventional K-Ar PW-8 "4.72E-04, 0.585E-04, 1.19E-04*" 0.622 0.3194 48 age of intrusion 16516 1 37.07 0.9 biotite conventional K-Ar PW-9 "4.72E-04, 0.585E-04, 1.19E-04*" 8.02 4.325 85 age of intrusion 16518 1 119.85 3.3 biotite conventional K-Ar 1 "0.572x10-10, 4.963x10-10, 1.167x10-4" 8.52 15.2 89 age of intrusion "Decay constants: 0.572x10-10, 4.963x10-10, 1.167x10-4" 16519 1 13.02 0.5 biotite conventional K-Ar 35 "0.572x10-10, 4.963x10-10, 1.167x10-4" 8.45 1.59 77 age of intrusion 16520 1 3.65 0 biotite conventional K-Ar 77AWs 152 "4.962E-04, 0.581E-04, 1.1167E-04" 8.5 0.4442 23 age of intrusion 16521 1 3.67 0 biotite conventional K-Ar 77AWs 251 "4.962E-04, 0.581E-04, 1.1167E-04" 8.16 0.4304 21 age of intrusion 16522 1 6.53 0 K feldspar conventional K-Ar 77AWs 96B "4.962E-04, 0.581E-04, 1.1167E-04" 14.07 1.323 48 age of intrusion 16523 1 7.37 0 biotite conventional K-Ar 77AWs 180 "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 0.965 19 age of intrusion 16524 1 9.86 0 hornblende conventional K-Ar 77AWs 100 "4.962E-04, 0.581E-04, 1.1167E-04" 0.531 0.0756 24 age of intrusion 16524 2 7.78 0 biotite conventional K-Ar 77AWs 100 "4.962E-04, 0.581E-04, 1.1167E-04" 9.11 1.0228 41 "Age too young, loss of Ar from biotite" 16525 1 6.03 0 biotite conventional K-Ar 77AWs 125 "4.962E-04, 0.581E-04, 1.1167E-04" 8.97 0.779 55 age of intrusion 16526 1 7.65 0 biotite conventional K-Ar 77AWs 179 "4.962E-04, 0.581E-04, 1.1167E-04" 9.01 0.994 18 age of intrusion 16527 1 21.29 0 biotite conventional K-Ar 77AWs 137 "4.962E-04, 0.581E-04, 1.1167E-04" 5.56 1.713 31 age of intrusion 16528 1 21.18 0 sericite conventional K-Ar 77AWs 183 "4.962E-04, 0.581E-04, 1.1167E-04" 2.514 0.7707 66 age of intrusion 16529 1 27.1 0 hornblende conventional K-Ar 77AMs 001 "4.962E-04, 0.581E-04, 1.1167E-04" 0.343 0.1345 23 age of volcanism 16530 1 36.3 hornblende conventional K-Ar 77AWs 30 "4.962E-04, 0.581E-04, 1.1167E-04" 1.76 0.1683 32 age of intrusion 16531 1 34.95 10 hornblende 77AWs 40 "4.962E-04, 0.581E-04, 1.1167E-04" 0.467 0.2372 30 age of intrusion 16532 1 37.8 hornblende conventional K-Ar 77AWs 46 "4.962E-04, 0.581E-04, 1.1167E-04" 0.311 0.1711 20 age of intrusion 16533 1 34.5 biotite conventional K-Ar 77AWs 74 "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 4.254 59 age of volcanism 16534 1 10.1 hornblende conventional K-Ar 77AWs 134 "4.962E-04, 0.581E-04, 1.1167E-04" 0.389 0.0567 8 age of intrusion 16535 1 92.4 0.9 biotite conventional K-Ar Umiat #1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.145 11.1 88 age of volcanism 16536 1 93.6 1.2 biotite conventional K-Ar Umiat #1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.71 9.28 59 age of volcanism 16537 1 93.3 0.9 biotite conventional K-Ar Simpson "4.962E-04, 0.581E-04, 1.1167E-04" 8.785 12.11 94 age of volcanism 16538 1 91.5 0.9 biotite conventional K-Ar Simpson "4.962E-04, 0.581E-04, 1.1167E-04" 8.285 11.2 85 age of volcanism 16539 1 93 0.9 biotite conventional K-Ar Simpson "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 11.96 94 age of volcanism 16544 1 156 5 muscovite conventional K-Ar 80-19-4 "4.962E-04, 0.581E-04, 1.1167E-04" 9.48 22.322 86 age of metamorphic crystallization "the avg K-Ar date is older than the avg Rb-Sr date, this may suggest the presence of inherited Ar" 16547 1 162 6 muscovite conventional K-Ar 80-91-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.35 20.329 94 age of metamorphic crystallization "The avg K-Ar date is older than the avg Rb-Sr date, this may suggest the presence of inherited Ar" 16548 1 141 5 muscovite conventional K-Ar 80-41-4 "4.962E-04, 0.581E-04, 1.1167E-04" 7.65 16.194 94 age of metamorphic crystallization "The avg K-Ar date is older than the avg Rb-Sr date, this mat suggest the presence of inherited Ar" 16549 1 122 4 paragonite conventional K-Ar 80-118-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.816 1.487 57 age of metamorphic crystallization "The avg K-Ar date is older than the avg Rb-Sr date, this may suggest the presence of inherited Ar" 16550 1 164 6 glaucophane-crossite conventional K-Ar 80-117-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.136 0.336 57 age of metamorphic crystallization "The avg K-Ar date is older than the avg Rb-Sr date, this may suggest the presence of inherited Ar" 16551 1 194 7 actinolite conventional K-Ar 80-151-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.176 0.519 61 age of metamorphic crystallization "The avg K-Ar date is older than the avg Rb-Sr date, this may suggest the presence of inherited Ar" 16552 1 175 7 glaucophane-crossite conventional K-Ar 67-ASn-595 "4.962E-04, 0.581E-04, 1.1167E-04" 0.089 0.237 61 age of metamorphic crystallization "The avg K-Ar date is older than avg Rb-Sr date, this may suggest the presence of inherited Ar" 16573 1 0.49 0.03 whole rock conventional K-Ar UAKA82-184 "4.962E-04, 0.581E-04, 1.1167E-04" 1.784 0.0125 80 age of volcanism groundmass 16574 1 1.47 0.06 whole rock conventional K-Ar UAKA82-96 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9298 0.0197 67 age of volcanism groundmass 16575 1 1.53 0.21 whole rock conventional K-Ar UAKA80-131 "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.0227 69 age of volcanism groundmass 16576 1 1.65 0.09 whole rock conventional K-Ar UAKA82-183 "4.962E-04, 0.581E-04, 1.1167E-04" 0.9184 0.0218 82 age of volcanism groundmass 16577 1 1.74 0.15 whole rock conventional K-Ar UAKA80-132 "4.962E-04, 0.581E-04, 1.1167E-04" 1.284 0.0321 72 groundmass Magnetostratigraphic correlations and other isotopic ages suggest an age of about 1.60 Ma. 16578 1 1.78 0.22 whole rock conventional K-Ar UAKA80-133 "4.962E-04, 0.581E-04, 1.1167E-04" 1.063 0.0273 51 age of volcanism groundmass 16579 1 1.83 0.21 whole rock conventional K-Ar UAKA80-134 "4.962E-04, 0.581E-04, 1.1167E-04" 1.621 0.0427 62 age of volcanism groundmass 16580 1 2 0.11 whole rock conventional K-Ar UAKA82-185 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7068 0.0205 82 age of volcanism groundmass 16581 1 2.05 0.1 whole rock conventional K-Ar UAKA82-95 "4.962E-04, 0.581E-04, 1.1167E-04" 1.137 0.0335 79 age of volcanism groundmass 16582 1 8.66 0.19 whole rock conventional K-Ar UAKA80-135 "4.962E-04, 0.581E-04, 1.1167E-04" 3.974 0.4967 11 age of volcanism groundmass 16583 1 8.97 0.19 whole rock conventional K-Ar UAKA80-136 "4.962E-04, 0.581E-04, 1.1167E-04" 1.605 0.2078 39 age of volcanism groundmass 16584 1 0.5 0.03 whole rock conventional K-Ar 705MC "4.962E-04, 0.581E-04, 1.1167E-04" 1.52 0.009 4 age of volcanism 16585 1 1.27 0.07 whole rock conventional K-Ar 706GP "4.962E-04, 0.581E-04, 1.1167E-04" 1.34 0.0204 3 age of volcanism 16586 1 0.91 0.02 whole rock conventional K-Ar 709WK "4.962E-04, 0.581E-04, 1.1167E-04" 1.28 0.0139 10 age of volcanism 16587 1 1.3 0.04 whole rock conventional K-Ar 712GP "4.962E-04, 0.581E-04, 1.1167E-04" 1.24 0.0192 9 age of volcanism 16588 1 1.01 0.02 whole rock conventional K-Ar 716SM "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 0.0145 17 age of volcanism 16589 1 1 0.02 whole rock conventional K-Ar 719V "4.962E-04, 0.581E-04, 1.1167E-04" 1.12 0.0134 15 age of volcanism 16590 1 1.56 0.03 whole rock conventional K-Ar 717MR "4.962E-04, 0.581E-04, 1.1167E-04" 0.68 0.0128 15 age of volcanism 16591 1 5.31 0.11 whole rock conventional K-Ar 771 "4.962E-04, 0.581E-04, 1.1167E-04" 0.73 0.0467 25 age of volcanism 16592 1 6.52 0.12 whole rock conventional K-Ar 801C "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 0.0834 18 age of volcanism 16593 1 0.76 0.02 whole rock conventional K-Ar 708WK "4.962E-04, 0.581E-04, 1.1167E-04" 1.97 0.018 24 age of volcanism 16594 1 0.61 0.01 whole rock conventional K-Ar 713SN "4.962E-04, 0.581E-04, 1.1167E-04" 1.57 0.0115 16 age of volcanism 16595 1 75.4 0.3 hornblende 39Ar-40Ar incremental (plateau) 87M4(1) "4.962E-04, 0.581E-04, 1.1167E-04" 0.6 age reset by thermal event 14 steps 16596 1 30.3 0.3 biotite 39Ar-40Ar incremental (plateau) 87M2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.3 age reset by thermal event 9 steps 16597 1 33.3 0.9 biotite 39Ar-40Ar incremental (plateau) 87M18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.2 age reset by thermal event 11 steps 16597 2 21.4 0.8 K feldspar 39Ar-40Ar incremental (plateau) 87M18 "4.962E-04, 0.581E-04, 1.1167E-04" 5.4 age meaning uncertain (geologic factors) 22 steps 16598 1 49.5 0.6 muscovite 39Ar-40Ar incremental (plateau) 86MM25 "4.962E-04, 0.581E-04, 1.1167E-04" 2.7 age reset by thermal event 11 steps 16599 1 48.8 5.2 muscovite 39Ar-40Ar incremental (plateau) MM87-8 "4.962E-04, 0.581E-04, 1.1167E-04" 9.9 age reset by thermal event 12 steps 16600 1 52.4 1.2 biotite 39Ar-40Ar incremental (plateau) MM87-7 "4.962E-04, 0.581E-04, 1.1167E-04" 7.7 age reset by thermal event 11 steps 16601 1 46.8 2.2 biotite 39Ar-40Ar incremental (plateau) 86MM23 "4.962E-04, 0.581E-04, 1.1167E-04" 7.4 age reset by thermal event 10 steps 16601 2 21.6 0.4 K feldspar 39Ar-40Ar incremental (plateau) 86MM23 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6 age meaning uncertain (geologic factors) 23 steps 16602 1 55.7 0.4 biotite 39Ar-40Ar incremental (plateau) 87D9 "4.962E-04, 0.581E-04, 1.1167E-04" 8.9 age reset by thermal event 11 steps 16602 2 20.9 0.8 K feldspar 39Ar-40Ar incremental (plateau) 87D9 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 age meaning uncertain (geologic factors) 22 steps 16603 1 47.9 1.2 biotite 39Ar-40Ar incremental (plateau) 87D20 "4.962E-04, 0.581E-04, 1.1167E-04" 5.5 age reset by thermal event 11 steps 16603 2 26.6 0.3 K feldspar 39Ar-40Ar incremental (plateau) 87D20 "4.962E-04, 0.581E-04, 1.1167E-04" 4.8 age meaning uncertain (geologic factors) 22 steps 16604 1 295 30.3 hornblende 39Ar-40Ar incremental (plateau) 86NP1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.1 15 steps Sample may not have been significantly outgassed during Late Cretaceous metamorphism. 16605 1 22.2 2 K feldspar 39Ar-40Ar incremental (plateau) 87P7 "4.962E-04, 0.581E-04, 1.1167E-04" 6.5 age meaning uncertain (geologic factors) 26 steps 16606 1 18.5 1 K feldspar 39Ar-40Ar incremental (plateau) 87P5 "4.962E-04, 0.581E-04, 1.1167E-04" 11.2 age meaning uncertain (geologic factors) 29 steps 16607 1 129 5 hornblende 39Ar-40Ar incremental (plateau) 87G30 "4.962E-04, 0.581E-04, 1.1167E-04" 0.6 age reset by thermal event 20 steps 16608 1 55.4 0.7 muscovite 39Ar-40Ar incremental (plateau) 87G16 "4.962E-04, 0.581E-04, 1.1167E-04" 5.6 age reset by thermal event 10 steps 16609 1 45.5 3.8 biotite 39Ar-40Ar incremental (plateau) 87G29 "4.962E-04, 0.581E-04, 1.1167E-04" 8.1 age reset by thermal event 11 steps 16610 1 37.1 3.4 biotite 39Ar-40Ar incremental (plateau) 87G36 "4.962E-04, 0.581E-04, 1.1167E-04" 8.4 age reset by thermal event 10 steps 16610 2 21.3 0.3 K feldspar 39Ar-40Ar incremental (plateau) 87G36 "4.962E-04, 0.581E-04, 1.1167E-04" 5.5 age meaning uncertain (geologic factors) 25 steps 16617 1 4.62 0.2 whole rock conventional K-Ar 1041 "4.72E-04, 0.585E-04, 1.19E-04*" 0.834 0.0555 9 age of volcanism 16618 1 4.87 0.2 whole rock conventional K-Ar 1044 "4.72E-04, 0.585E-04, 1.19E-04*" 1.547 0.1087 36 age of volcanism 16619 1 4.96 0.2 whole rock conventional K-Ar 91352 "4.72E-04, 0.585E-04, 1.19E-04*" 1.157 0.0828 16 age of volcanism 16620 1 6.26 0.3 whole rock conventional K-Ar 1004 "4.72E-04, 0.585E-04, 1.19E-04*" 1.177 0.1062 8 age of volcanism 16621 1 4.58 0.2 whole rock conventional K-Ar 1006 "4.72E-04, 0.585E-04, 1.19E-04*" 1.447 0.0956 5 age of volcanism 16622 1 5.68 0.2 whole rock conventional K-Ar 1031 "4.72E-04, 0.585E-04, 1.19E-04*" 0.706 0.0578 9 age of volcanism 16623 1 8.05 0.3 whole rock conventional K-Ar 1023 "4.72E-04, 0.585E-04, 1.19E-04*" 0.877 0.1019 7 age of volcanism 16624 1 10.37 0.4 whole rock conventional K-Ar 91347 "4.72E-04, 0.585E-04, 1.19E-04*" 0.607 0.0909 46 age of volcanism 16625 1 10.66 0.4 whole rock conventional K-Ar 1022 "4.72E-04, 0.585E-04, 1.19E-04*" 0.8 0.1231 13 age of volcanism 16626 1 11.32 0.5 whole rock conventional K-Ar 1034 "4.72E-04, 0.585E-04, 1.19E-04*" 0.914 0.1494 19 age of volcanism 16627 1 11.86 0.5 whole rock conventional K-Ar 1008 "4.72E-04, 0.585E-04, 1.19E-04*" 0.691 0.1184 36 age of volcanism 16628 1 13.47 0.5 whole rock conventional K-Ar 1045 "4.72E-04, 0.585E-04, 1.19E-04*" 1.111 0.2162 33 age of volcanism 16629 1 13.43 0.5 whole rock conventional K-Ar 1138 "4.72E-04, 0.585E-04, 1.19E-04*" 1.245 0.2416 26 age of volcanism 16630 1 13.65 0.5 whole rock conventional K-Ar 1139 "4.72E-04, 0.585E-04, 1.19E-04*" 0.622 0.1227 11 age of volcanism 16631 1 13.77 0.5 whole rock conventional K-Ar 91354 "4.72E-04, 0.585E-04, 1.19E-04*" 1.515 0.3014 24 age of volcanism 16632 1 13.86 0.5 whole rock conventional K-Ar 91350 "4.72E-04, 0.585E-04, 1.19E-04*" 0.825 0.1653 50 age of volcanism 16633 1 14.32 0.6 whole rock conventional K-Ar 1042 "4.72E-04, 0.585E-04, 1.19E-04*" 1.725 0.357 29 age of volcanism 16634 1 14.99 0.5 biotite conventional K-Ar 91351 "4.72E-04, 0.585E-04, 1.19E-04*" 7.06 1.5304 31 age of volcanism 16635 1 15.18 0.5 biotite conventional K-Ar 91340 "4.72E-04, 0.585E-04, 1.19E-04*" 8.635 1.8956 53 age of volcanism 16636 1 18.92 0.6 hornblende conventional K-Ar 91349 "4.72E-04, 0.585E-04, 1.19E-04*" 1.017 0.2785 29 age of volcanism 16638 1 53.68 0.97 illite conventional K-Ar 1149-10 "4.962E-04, 0.581E-04, 1.1167E-04" 5.975 4.685 66 Age reflects diagentic episode responsible for the formation of authigenic minerals in the upper Jurassic Morrison Fm. 16639 1 55.48 0.99 illite conventional K-Ar DH-jmb-16 "4.962E-04, 0.581E-04, 1.1167E-04" 7.258 5.936 76 Age reflects diagentic episode responsible for the formation of authigenic minerals in the upper Jurassic Morrison Fm. 16640 1 55.48 0.99 illite conventional K-Ar PR-jmb-19 "4.962E-04, 0.581E-04, 1.1167E-04" 6.88 5.579 78 Age reflects diagentic episode responsible for the formation of authigenic minerals in the upper Jurassic Morrison Fm. 16641 1 29.69 0.56 illite conventional K-Ar S6-001 "4.962E-04, 0.581E-04, 1.1167E-04" 1.761 0.759 24 Age reflects diagentic episode responsible for the formation of authigenic minerals in the upper Jurassic Morrison Fm. 16642 1 33.79 0.6 illite conventional K-Ar S6-002 "4.962E-04, 0.581E-04, 1.1167E-04" 4.172 2.048 43 Age reflects diagentic episode responsible for the formation of authigenic minerals in the upper Jurassic Morrison Fm. 16692 1 26.12 0.1 sanidine 39Ar-40Ar total fusion 85L-29-C "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 700-1050 16692 2 26.15 0.12 biotite 39Ar-40Ar total fusion 85L-29-C "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 800-1080 16692 3 26.41 0.08 biotite 39Ar-40Ar total fusion 85L-29-F "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 730-1075 16693 1 26.53 0.11 biotite 39Ar-40Ar total fusion SJ85-73 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 1035-fuse 16694 1 26.3 0.09 biotite 39Ar-40Ar total fusion 85L-37 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 720-fuse 16695 1 26.69 0.16 Unk 39Ar-40Ar total fusion 85S-129 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 680-fuse 16696 1 26.86 0.12 biotite 39Ar-40Ar total fusion 82COLE-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 500-fuse 16697 1 27.17 0.12 biotite 39Ar-40Ar total fusion 82COLE-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 600-1175 16698 1 27.61 0.21 biotite 39Ar-40Ar total fusion 82COLE-11 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Temperature heating steps in degrees celcius: 675-fuse 16717 1 30.3 1 hornblende conventional K-Ar A "4.962E-04, 0.581E-04, 1.1167E-04" 1.47 0.6465 32 age of intrusion 16718 1 23.4 0.4 biotite conventional K-Ar B "4.962E-04, 0.581E-04, 1.1167E-04" 9.4 3.1796 75 age of metamorphic crystallization 16719 1 109.5 10 hornblende conventional K-Ar C "4.962E-04, 0.581E-04, 1.1167E-04" 0.298 0.4842 13 age of metamorphic crystallization 16720 1 81.6 3 hornblende conventional K-Ar D "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.724 51 age of metamorphic crystallization 16721 1 223.5 7 hornblende conventional K-Ar E "4.962E-04, 0.581E-04, 1.1167E-04" 0.465 1.5886 65 age of metamorphic crystallization 16722 1 194.4 6 hornblende conventional K-Ar F "4.962E-04, 0.581E-04, 1.1167E-04" 0.65 1.9189 64 age of metamorphic crystallization 16723 1 13.3 1 biotite conventional K-Ar G "4.962E-04, 0.581E-04, 1.1167E-04" 8.07 1.5487 27 age meaning uncertain (geologic factors) 16723 2 38.1 1.7 hornblende conventional K-Ar G "4.962E-04, 0.581E-04, 1.1167E-04" 1.36 0.7518 39 age of metamorphic crystallization 16724 1 15.5 0.4 biotite conventional K-Ar H "4.962E-04, 0.581E-04, 1.1167E-04" 7.7 1.7199 51 age of metamorphic crystallization 16725 1 153.9 0.9 muscovite conventional K-Ar I "4.962E-04, 0.581E-04, 1.1167E-04" 10.06 23.275 87 age of intrusion 16726 1 14.1 0.6 sanidine conventional K-Ar F-8830 "4.962E-04, 0.581E-04, 1.1167E-04" 8.25 73 age of volcanism 16728 1 30.9 0.3 whole rock conventional K-Ar SCV 16 "4.962E-04, 0.581E-04, 1.1167E-04" 1.338 85 age of volcanism 16729 1 28.7 0.3 whole rock conventional K-Ar SCV 28 "4.962E-04, 0.581E-04, 1.1167E-04" 1.675 97 age of volcanism 16730 1 26 0.3 whole rock conventional K-Ar SCV 53 "4.962E-04, 0.581E-04, 1.1167E-04" 2.181 65 age of volcanism 16732 1 36.6 1.1 biotite conventional K-Ar 7438 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16732 2 34.8 1.7 hornblende conventional K-Ar 7438 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16732 3 36.3 0.3 hornblende 39Ar-40Ar incremental (plateau) 7438 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16732 4 29 orthoclase 39Ar-40Ar incremental (plateau) 7438 "4.962E-04, 0.581E-04, 1.1167E-04" age too young 16733 1 41.1 1.2 hornblende conventional K-Ar 7569 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16733 2 34.8 0.8 biotite conventional K-Ar 7569 "4.962E-04, 0.581E-04, 1.1167E-04" "age too young, loss of Ar" 16733 3 37.1 0.3 hornblende 39Ar-40Ar incremental (plateau) 7569 "4.962E-04, 0.581E-04, 1.1167E-04" Ar-release spectrum indicates excess Ar. 16733 4 34.4 0.3 biotite 39Ar-40Ar incremental (plateau) 7569 "4.962E-04, 0.581E-04, 1.1167E-04" age meaning uncertain (analysis questionable) Total gas age 16734 1 36.9 1.1 hornblende conventional K-Ar 7570 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16734 2 34.5 0.8 biotite conventional K-Ar 7570 "4.962E-04, 0.581E-04, 1.1167E-04" "Age too young, Ar leaked." 16734 3 36.4 hornblende 39Ar-40Ar incremental (plateau) 7570 "4.962E-04, 0.581E-04, 1.1167E-04" "Discordant Ar-release spectrum, age is total gas age" 16734 4 34.5 0.3 biotite 39Ar-40Ar incremental (plateau) 7570 "4.962E-04, 0.581E-04, 1.1167E-04" "Nearly concordant Ar-release spectrum, age is total gas age" 16734 5 34 orthoclase 39Ar-40Ar incremental (plateau) 7570 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16735 1 35.4 0.3 hornblende 39Ar-40Ar incremental (plateau) 7574 "4.962E-04, 0.581E-04, 1.1167E-04" Ar-release spectrum indicates excess Ar. Total gas age given as 36.1 m.y. 16735 2 34.6 0.3 biotite 39Ar-40Ar incremental (plateau) 7574 "4.962E-04, 0.581E-04, 1.1167E-04" Age based on Ar-release spectrum plateau. Total gas age given as 34.5 m.y. 16735 3 32 orthoclase 39Ar-40Ar incremental (plateau) 7574 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 16736 1 33.9 biotite conventional K-Ar 7723 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism 16736 2 35.7 0.3 hornblende 39Ar-40Ar incremental (plateau) 7723 "4.962E-04, 0.581E-04, 1.1167E-04" maximum age of volcanism Max closure age. Total gas age 36.7 Ma 16736 3 33.6 0.3 biotite 39Ar-40Ar incremental (plateau) 7723 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 16737 1 37.2 1.7 hornblende conventional K-Ar 7435 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16737 2 36 1.1 biotite conventional K-Ar 7435 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16737 3 36.1 0.3 hornblende 39Ar-40Ar incremental (plateau) 7435 "4.962E-04, 0.581E-04, 1.1167E-04" Age based on Ar-release spectrum plateau. Total gas age is 37.2 Ma 16737 4 34 0.3 biotite 39Ar-40Ar incremental (plateau) 7435 "4.962E-04, 0.581E-04, 1.1167E-04" Age based on Ar-release spectrum plateau. Total gas age is 33.9 Ma 16738 1 33.2 0.7 biotite conventional K-Ar 7788 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16739 1 115 6 hornblende conventional K-Ar 7457 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 16739 2 46.3 1.4 biotite conventional K-Ar 7457 "4.962E-04, 0.581E-04, 1.1167E-04" Age is erroniously young 16741 1 5.13 0.15 plagioclase conventional K-Ar R8-1-17-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.011 0.0748 55 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16742 1 5.44 0.14 plagioclase conventional K-Ar R8-1-24-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 0.0831 74 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16743 1 5.74 0.1 plagioclase conventional K-Ar R8-1-28-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.022 0.1672 67 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16744 1 5.61 0.15 plagioclase conventional K-Ar R8-1-29-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.319 0.1067 49 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16745 1 5.8 0.13 plagioclase conventional K-Ar R9-1-48-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.435 0.1199 76 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16746 1 5.94 0.14 plagioclase conventional K-Ar R9-1-56-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.491 0.1277 66 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16747 1 5.76 0.14 plagioclase conventional K-Ar R9-1-57-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.655 0.1374 67 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16748 1 4.03 0.12 plagioclase conventional K-Ar R8-1-2-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.771 0.1028 71 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16749 1 4.64 0.14 plagioclase conventional K-Ar R8-1-13-LN "4.962E-04, 0.581E-04, 1.1167E-04" 0.992 0.0662 68 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16750 1 3.99 0.1 plagioclase conventional K-Ar R8-1-18-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.186 0.0681 75 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16751 1 4.15 0.13 plagioclase conventional K-Ar R8-1-19-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.055 0.064 67 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16752 1 3 0.08 plagioclase conventional K-Ar R8-1-27-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.227 0.0963 50 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16753 1 3.76 0.11 plagioclase conventional K-Ar R9-1-46-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.927 0.1045 38 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16754 1 3.95 0.12 plagioclase conventional K-Ar R9-1-58-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.645 0.0935 58 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16755 1 4.39 0.18 plagioclase conventional K-Ar R8-1-16-LN "4.962E-04, 0.581E-04, 1.1167E-04" 4.358 0.2753 86 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16756 1 4.24 0.06 plagioclase conventional K-Ar R8-1-43-LN "4.962E-04, 0.581E-04, 1.1167E-04" 5.868 0.3587 64 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16757 1 14.1 0.14 plagioclase conventional K-Ar N9-SD-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.073 0.4212 83 age of volcanism age was obtained from groundmass separates. feldspar phenocrysts and megacrysts were removed from samples prior to analysis. 16758 1 30.9 1 whole rock conventional K-Ar BJS-5 "4.962E-04, 0.581E-04, 1.1167E-04" 3.06 1.371 39 age of volcanism 16759 1 35.2 1.1 whole rock conventional K-Ar BJS-10 "4.962E-04, 0.581E-04, 1.1167E-04" 2.86 1.4265 39 age of volcanism 16760 1 37.1 1 biotite conventional K-Ar BJS-6 "4.962E-04, 0.581E-04, 1.1167E-04" 7.67 4.1347 44 age of volcanism 16761 1 38.9 0.3 biotite conventional K-Ar BJS-3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.87 5.0149 83 age of volcanism 16762 1 43.3 0.4 biotite conventional K-Ar BJS-1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.63 4.1847 74 age of volcanism 16763 1 15.7 0.6 sanidine conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.27 1.71 85 age of volcanism 16765 1 13.5 0.4 muscovite conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.7 1.3087 age of intrusion 16766 1 14 0.4 muscovite conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.5 0.9088 age of intrusion 16767 1 13.6 0.4 muscovite conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 1.7009 age of intrusion 16768 1 13.7 0.4 muscovite conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 6.8 1.3452 age of intrusion 16769 1 12.9 0.4 adularia conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 12.62 2.3453 age of intrusion 16770 1 13.1 0.4 adularia conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 13.39 2.5313 age of intrusion 16771 1 15.9 1 alunite conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.08 0.2476 age of intrusion 16772 1 14.9 0.6 sericite conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 3.2 0.6916 age of intrusion 16773 1 16.3 0.5 alunite conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.3048 age of intrusion 16774 1 15.4 1 alunite conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.33 0.0732 age of intrusion 16775 1 15 0.6 alunite conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.24 0.2696 age of intrusion 16776 1 10 0.8 alunite conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 1.18 0.1697 age of intrusion 16777 1 9.3 0.5 alunite conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 5.04 0.6788 age of intrusion 16778 1 9.4 0.8 alunite conventional K-Ar 14a "4.962E-04, 0.581E-04, 1.1167E-04" 4.12 0.5595 age of intrusion 16779 1 16 1.6 alunite conventional K-Ar 14b "4.962E-04, 0.581E-04, 1.1167E-04" 3.47 0.8055 age of intrusion 16780 1 13.8 0.4 alunite conventional K-Ar 15a "4.962E-04, 0.581E-04, 1.1167E-04" 1.33 0.2654 age of intrusion 16781 1 14.1 0.7 alunite conventional K-Ar 15b "4.962E-04, 0.581E-04, 1.1167E-04" 0.86 0.1756 age of intrusion 16782 1 14.3 0.5 plagioclase conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.0968 age of intrusion 16783 1 15 1.6 plagioclase conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.513 0.1149 age of intrusion 16784 1 13.3 0.6 K feldspar conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 4.21 0.8578 age of intrusion 16785 1 13.5 0.4 whole rock conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 1.15 0.2954 Age likely has been reset 16786 1 13.7 0.5 whole rock conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 1.167 0.2306 Age likely has been reset 16787 1 16.6 0.6 hornblende conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.535 0.1283 age of intrusion 16788 1 20.1 1.4 hornblende conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.755 0.2269 age of intrusion 16789 1 18.1 0.8 hornblende conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 0.618 0.162 age of intrusion 16790 1 13.6 0.6 plagioclase conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 0.617 0.1214 age of volcanism 16790 2 10.6 0.4 whole rock conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 1.27 0.1935 age of volcanism 16791 1 13.2 1.3 plagioclase conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 0.5547 age of volcanism 16791 2 14.3 0.5 whole rock conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 1.7 0.3511 age of volcanism 16792 1 13.3 0.7 plagioclase conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 0.317 0.0608 age of volcanism 16793 1 13.6 0.8 plagioclase conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 0.635 0.1246 age of volcanism 16794 1 13.4 0.4 feldspar conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 2.286 0.4418 age of intrusion 16795 1 11.6 0.4 feldspar conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 2.75 0.461 age of intrusion 16796 1 8.6 0.3 whole rock conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" 0.725 0.09 age of intrusion 16797 1 16.1 0.7 alunite conventional K-Ar PM1112-1 "4.962E-04, 0.581E-04, 1.1167E-04" 4.81 1.15 18 age of intrusion The age was obtained on a qtz-alunite rib in porphyritic andesite 16798 1 24.3 1 biotite conventional K-Ar 34981-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.96 2.8 61 age of volcanism 16799 1 16.6 0.7 biotite conventional K-Ar 35014-1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.49 1.56 54 age of volcanism 16800 1 14.9 0.7 biotite conventional K-Ar 35053-2 "4.962E-04, 0.581E-04, 1.1167E-04" 5.94 1.28 24 age of volcanism 16801 1 14.3 0.6 biotite conventional K-Ar 35099-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.83 1.62 29 age of volcanism 16802 1 95.8 3.5 biotite conventional K-Ar 35010-2 "4.962E-04, 0.581E-04, 1.1167E-04" 7.842 11.106 78 age of volcanism 16803 1 93.1 3.4 biotite conventional K-Ar 35015-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.255 11.349 73 age of volcanism 16804 1 96.9 3.6 biotite conventional K-Ar 35017-3 "4.962E-04, 0.581E-04, 1.1167E-04" 6.056 8.679 50 age of volcanism 16805 1 22.1 0.3 sanidine conventional K-Ar 139-RRC "4.962E-04, 0.581E-04, 1.1167E-04" 7.44 2.382 68 age of volcanism 16806 1 23.6 0.4 sanidine conventional K-Ar 048-MC "4.962E-04, 0.581E-04, 1.1167E-04" 11.96 4.096 51 age of volcanism 16807 1 23.5 0.4 sanidine conventional K-Ar 514-ADW "4.962E-04, 0.581E-04, 1.1167E-04" 10.88 3.702 60 age of volcanism 16808 1 23.5 0.4 sanidine conventional K-Ar 497-TC "4.962E-04, 0.581E-04, 1.1167E-04" 11.14 3.79 64 age of volcanism 16809 1 23.9 0.5 sanidine conventional K-Ar 024-MC "4.962E-04, 0.581E-04, 1.1167E-04" 11.03 3.814 69 age of volcanism 16810 1 25 0.5 sanidine conventional K-Ar 005-MC "4.962E-04, 0.581E-04, 1.1167E-04" 11.32 4.103 59 age of volcanism 16811 1 25.9 0.5 sanidine conventional K-Ar 657-SC-S "4.962E-04, 0.581E-04, 1.1167E-04" 11.06 4.158 68 age of volcanism 16811 2 26.6 0.6 biotite conventional K-Ar 657-SC-S "4.962E-04, 0.581E-04, 1.1167E-04" 8.12 3.129 67 age of volcanism 16812 1 26.5 0.5 sanidine conventional K-Ar 641-NPC "4.962E-04, 0.581E-04, 1.1167E-04" 11.01 4.235 70 age of volcanism 16813 1 25.8 0.5 sanidine conventional K-Ar 618-SS "4.962E-04, 0.581E-04, 1.1167E-04" 10.78 4.024 60 age of volcanism 16814 1 26.3 1 sanidine conventional K-Ar 451-ACK "4.962E-04, 0.581E-04, 1.1167E-04" 10.83 3.958 43 age of volcanism 16815 1 26.5 0.4 sanidine conventional K-Ar 723-SP-S "4.962E-04, 0.581E-04, 1.1167E-04" 11.07 4.256 38 age of volcanism 16815 2 27.2 0.6 biotite conventional K-Ar 723-SP-S "4.962E-04, 0.581E-04, 1.1167E-04" 8.47 4.698 58 age of volcanism 16816 1 26.8 0.6 sanidine conventional K-Ar 720-SP-S "4.962E-04, 0.581E-04, 1.1167E-04" 9.53 3.704 76 age of volcanism 16816 2 25.5 0.6 biotite conventional K-Ar 720-SP-S "4.962E-04, 0.581E-04, 1.1167E-04" 7.5 2.767 76 age of volcanism 16817 1 27.3 1.1 sanidine conventional K-Ar 217-SP "4.962E-04, 0.581E-04, 1.1167E-04" 10.63 4.35 35 age of volcanism 16818 1 26.8 0.5 sanidine conventional K-Ar K-Ar-RM-2 "4.962E-04, 0.581E-04, 1.1167E-04" 11.18 4.349 50 age of volcanism 16818 2 24.4 0.6 biotite conventional K-Ar K-Ar-RM-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.36 3.267 81 minimum age of volcanism 16819 1 27.3 0.5 sanidine conventional K-Ar 367-RC-S "4.962E-04, 0.581E-04, 1.1167E-04" 11.2 4.431 32 age of volcanism 16819 2 27 0.8 biotite conventional K-Ar 367-RC-B "4.962E-04, 0.581E-04, 1.1167E-04" 8.09 3.168 83 age of volcanism 16820 1 27.7 0.7 sanidine conventional K-Ar 550-CC "4.962E-04, 0.581E-04, 1.1167E-04" 10.9 4.388 60 age of volcanism 16821 1 29.6 0.6 sanidine conventional K-Ar 368RC "4.962E-04, 0.581E-04, 1.1167E-04" 9.81 2.168 32 age of volcanism 16822 1 32.3 0.7 sanidine conventional K-Ar 701-DC "4.962E-04, 0.581E-04, 1.1167E-04" 7.78 3.646 59 age of volcanism 16823 1 26.6 1.1 sanidine conventional K-Ar 380-MZ-S "4.962E-04, 0.581E-04, 1.1167E-04" 10.79 4.03 25 age of intrusion 16823 2 26.5 0.7 biotite conventional K-Ar 380-MZ-S "4.962E-04, 0.581E-04, 1.1167E-04" 8.35 3.213 74 age of intrusion 16824 1 21.7 0.4 sanidine conventional K-Ar 527-CC "4.962E-04, 0.581E-04, 1.1167E-04" 10.93 3.437 62 age of intrusion 16825 1 23.7 0.4 sanidine conventional K-Ar 490-NBC-S "4.962E-04, 0.581E-04, 1.1167E-04" 11.4 3.914 69 age of intrusion 16825 2 25.2 0.5 biotite conventional K-Ar 490-NBC-S "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 3.102 59 age of intrusion 16826 1 15.1 0.4 whole rock conventional K-Ar HOG-MOB "4.962E-04, 0.581E-04, 1.1167E-04" 4.73 1.0357 88 age of volcanism 16827 1 15.2 0.4 alunite conventional K-Ar HR-56 "4.962E-04, 0.581E-04, 1.1167E-04" 10.76 2.3663 53 age of intrusion 16828 1 15.7 0.4 adularia conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 13.34 3.037 32 age of intrusion 16829 1 15.3 0.5 whole rock conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.72 1.042 38 age of volcanism 16830 1 10.46 0.23 plagioclase conventional K-Ar F8-24-100-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.152 0.1738 61 age of volcanism 16831 1 9.11 0.3 plagioclase conventional K-Ar F8-24-88-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.369 0.3111 41 age of volcanism 16832 1 8.53 0.22 plagioclase conventional K-Ar F8-24-90-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.176 0.2677 78 age of volcanism 16833 1 8.49 0.2 plagioclase conventional K-Ar F8-24-85-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.498 0.3056 80 age of volcanism 16834 1 10.21 0.23 plagioclase conventional K-Ar 88-24-146-LN "4.962E-04, 0.581E-04, 1.1167E-04" 2.691 0.3963 89 age of volcanism 16835 1 6.02 0.39 plagioclase conventional K-Ar 87-10-129-LN "4.962E-04, 0.581E-04, 1.1167E-04" 0.775 0.0665 10 age of volcanism 16836 1 5.89 0.18 plagioclase conventional K-Ar F7-38-13-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.123 0.0953 53 age of volcanism 16837 1 5.73 0.13 plagioclase conventional K-Ar 87-38-142-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.129 0.0933 49 age of volcanism 16838 1 5.42 0.13 plagioclase conventional K-Ar 87-38-143-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.53 0.1195 44 age of volcanism 16839 1 4.74 0.12 plagioclase conventional K-Ar 87-57-131-LN "4.962E-04, 0.581E-04, 1.1167E-04" 0.9797 0.0693 46 age of volcanism 16840 1 5.16 0.14 plagioclase conventional K-Ar 87-57-132-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.055 0.0784 36 age of volcanism 16841 1 5.43 0.16 plagioclase conventional K-Ar F8-42-82-LN "4.962E-04, 0.581E-04, 1.1167E-04" 1.528 0.1197 53 age of volcanism 16842 1 74.2 1.9 sericite conventional K-Ar 82-DJ-58A "4.962E-04, 0.581E-04, 1.1167E-04" 10.96 11.947 88 age of intrusion 16843 1 68 1.6 muscovite conventional K-Ar 82-DJ-208 "4.962E-04, 0.581E-04, 1.1167E-04" 10.81 10.787 60 age of intrusion 16844 1 220.9 6.6 hornblende conventional K-Ar 82-DJ-167 "4.962E-04, 0.581E-04, 1.1167E-04" 1.075 3.6369 76 age of intrusion 16845 1 0.14 0.01 whole rock 39Ar-40Ar total fusion Dec-81 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16846 1 0.14 0.01 whole rock 39Ar-40Ar total fusion Jan-84 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16847 1 0.14 0.01 whole rock 39Ar-40Ar total fusion Feb-82 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16848 1 0.14 0.01 whole rock 39Ar-40Ar total fusion Mar-82 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16849 1 0.14 0.01 whole rock 39Ar-40Ar total fusion Apr-82 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16850 1 0.14 0.01 whole rock 39Ar-40Ar total fusion 223 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16851 1 0.14 0.01 whole rock 39Ar-40Ar total fusion 211 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism analysis is from the total fusion of individual whole-rock grains Age given here in the data bank is a weighted average 16852 1 42.9 1.2 K feldspar conventional K-Ar HR79-104 "4.962E-04, 0.581E-04, 1.1167E-04" 14.6 9.1286 87 Age considered young due to Ar loss 16853 1 55.7 2.2 K feldspar conventional K-Ar HR81-1 "4.962E-04, 0.581E-04, 1.1167E-04" 15.4 12.55 54 Age considered young due to Ar loss 16854 1 63.4 2.3 K feldspar conventional K-Ar HR80-10 "4.962E-04, 0.581E-04, 1.1167E-04" 12.03 11.174 64 Age considered young due to Ar loss 16855 1 67.2 2.1 muscovite conventional K-Ar RD82-2 "4.962E-04, 0.581E-04, 1.1167E-04" 5.04 4.9623 91 age of metamorphic crystallization 16856 1 70.8 2.1 muscovite conventional K-Ar HR80-7 "4.962E-04, 0.581E-04, 1.1167E-04" 6.56 6.8236 77 age of intrusion 16857 1 71.9 2.1 muscovite conventional K-Ar HR81-2 "4.962E-04, 0.581E-04, 1.1167E-04" 10.64 11.241 91 age of intrusion 16858 1 78.3 2.4 muscovite conventional K-Ar POI-127 "4.962E-04, 0.581E-04, 1.1167E-04" 4.89 5.6369 50 age of metamorphic crystallization 16859 1 81.7 2.4 biotite conventional K-Ar SP80-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.04 9.671 74 age of intrusion 16860 1 85.3 2.5 muscovite conventional K-Ar HR79-56 "4.962E-04, 0.581E-04, 1.1167E-04" 10.59 13.312 93 age of metamorphic crystallization 16861 1 94.6 2.8 muscovite conventional K-Ar RD82-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.25 14.339 93 age of volcanism 16862 1 97.6 3 muscovite conventional K-Ar RD304-275 "4.962E-04, 0.581E-04, 1.1167E-04" 4.74 6.8444 62 age of intrusion 16863 1 97.7 2.9 Unk conventional K-Ar SAC85-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 1.2717 54 age of intrusion analyzed minerals included pyrophyllite+qtz+white mica 16864 1 103.4 10 chlorite group conventional K-Ar HM85-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.05 0.0766 9 age of intrusion 16865 1 23 0.9 biotite conventional K-Ar GAD-4 "4.962E-04, 0.581E-04, 1.1167E-04" 8.578 2.8575 54 age of volcanism 16866 1 20.1 0.6 whole rock conventional K-Ar 87-DJ-8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.251 0.3637 70 age of volcanism 16867 1 19.3 0.9 whole rock conventional K-Ar GAD-16 "4.962E-04, 0.581E-04, 1.1167E-04" 3.39 0.9468 29 age of volcanism 16868 1 18.2 1 whole rock conventional K-Ar GAD-14 "4.962E-04, 0.581E-04, 1.1167E-04" 2.409 0.5405 31 age of volcanism 16869 1 17.9 0.9 whole rock conventional K-Ar GAD-13 "4.962E-04, 0.581E-04, 1.1167E-04" 2.59 0.6713 28 age of volcanism 16869 2 17.6 0.7 whole rock conventional K-Ar GAD-13 "4.962E-04, 0.581E-04, 1.1167E-04" 2.91 0.892 71 age of volcanism 16870 1 17.6 0.9 whole rock conventional K-Ar GAD-15 "4.962E-04, 0.581E-04, 1.1167E-04" 1.938 0.4918 42 age of volcanism 16871 1 17.3 0.9 whole rock conventional K-Ar GAD-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.153 0.5382 39 age of volcanism 16871 2 15.5 0.6 whole rock conventional K-Ar GAD-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.27 0.614 91 minimum age of volcanism 16872 1 15.6 0.8 whole rock conventional K-Ar GAD-3 "4.962E-04, 0.581E-04, 1.1167E-04" 2.793 0.6315 50 age of volcanism 16873 1 19.2 0.6 biotite conventional K-Ar 87-DJ-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.82 2.1777 70 age of volcanism 16874 1 12.1 0.3 whole rock conventional K-Ar 87-DJ-146 "4.962E-04, 0.581E-04, 1.1167E-04" 2.24 0.3912 44 age of volcanism 16875 1 22.1 1.1 alunite conventional K-Ar GAD-7 "4.962E-04, 0.581E-04, 1.1167E-04" 2.169 0.6922 17 maximum age of volcanism age indicates time of alteration 16876 1 22 1.1 sericite conventional K-Ar GAD-18 "4.962E-04, 0.581E-04, 1.1167E-04" 2.585 0.822 36 age of volcanism age indicates time of alteration 16877 1 20 0.9 alunite conventional K-Ar GAD-2 "4.962E-04, 0.581E-04, 1.1167E-04" 5.85 1.7178 28 age of volcanism age indicates time of alteration 16878 1 19.2 0.8 alunite conventional K-Ar GAD-5 "4.962E-04, 0.581E-04, 1.1167E-04" 6.83 2.288 44 age of volcanism age indicates time of alteration 16879 1 18.9 0.8 alunite conventional K-Ar JF-5-2-1 "4.962E-04, 0.581E-04, 1.1167E-04" 5.562 1.5615 29 age of volcanism age indicates time of alteration 16880 1 18.8 0.8 alunite conventional K-Ar GAD-12 "4.962E-04, 0.581E-04, 1.1167E-04" 4.851 1.3203 42 age of volcanism age indicates time of alteration 16881 1 17.6 0.7 alunite conventional K-Ar JF-5-2-11 "4.962E-04, 0.581E-04, 1.1167E-04" 9.066 2.3085 56 age of volcanism age indicates time of alteration 16882 1 18.3 0.8 alunite conventional K-Ar GDA "4.962E-04, 0.581E-04, 1.1167E-04" 4.611 1.2018 40 age of volcanism age indicates time of alteration 16883 1 35.8 biotite conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 7.864 7 age of volcanism 16884 1 35.7 biotite conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 6.725 6 age of volcanism 16885 1 32.5 whole rock conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 4.198 10 age of volcanism 16886 1 32.6 whole rock conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 3.964 9 age of volcanism 16887 1 32.3 whole rock conventional K-Ar 88 "4.962E-04, 0.581E-04, 1.1167E-04" 4.025 15 age of volcanism 16888 1 30.5 biotite conventional K-Ar 67 "4.962E-04, 0.581E-04, 1.1167E-04" 7.914 7 age of volcanism 16888 2 30.3 whole rock conventional K-Ar 67 "4.962E-04, 0.581E-04, 1.1167E-04" 4.256 50 age of volcanism biotite free 16889 1 29.2 whole rock conventional K-Ar 79 "4.962E-04, 0.581E-04, 1.1167E-04" 4.033 63 age of volcanism 16889 2 28.1 whole rock conventional K-Ar 79 "4.962E-04, 0.581E-04, 1.1167E-04" 4.015 65 age of volcanism 16890 1 12.9 0.4 adularia conventional K-Ar CN85-9 "4.962E-04, 0.581E-04, 1.1167E-04" 12.62 2.3453 54 age of intrusion 16891 1 13.1 0.4 adularia conventional K-Ar CN85-25 "4.962E-04, 0.581E-04, 1.1167E-04" 13.39 2.5313 59 age of intrusion 16892 1 14.1 0.4 muscovite conventional K-Ar NB-3A "4.962E-04, 0.581E-04, 1.1167E-04" 3.72 0.759 45 age of intrusion 16893 1 13.5 0.4 muscovite conventional K-Ar CNS84-10 "4.962E-04, 0.581E-04, 1.1167E-04" 6.7 1.3087 43 age of intrusion 16894 1 13.6 0.4 muscovite conventional K-Ar 72524 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 1.7009 68 age of intrusion 16895 1 13.7 0.4 muscovite conventional K-Ar CN84-4 "4.962E-04, 0.581E-04, 1.1167E-04" 6.8 1.3452 78 age of intrusion 16896 1 14 0.4 muscovite conventional K-Ar CN85-46 "4.962E-04, 0.581E-04, 1.1167E-04" 4.5 0.9088 43 age of intrusion 16897 1 9.3 0.5 alunite conventional K-Ar RC84-3 "4.962E-04, 0.581E-04, 1.1167E-04" 5.04 0.6788 26 age of intrusion 16898 1 9.4 0.8 alunite conventional K-Ar VC84-5C "4.962E-04, 0.581E-04, 1.1167E-04" 4.12 0.5595 12 age of intrusion 16899 1 10 0.8 alunite conventional K-Ar VC84-11A "4.962E-04, 0.581E-04, 1.1167E-04" 1.18 0.1697 15 age of intrusion 16900 1 13.8 0.4 alunite conventional K-Ar VC85-17A "4.962E-04, 0.581E-04, 1.1167E-04" 1.33 0.2654 23 age of intrusion 16901 1 14.1 0.7 alunite conventional K-Ar VC85-17 "4.962E-04, 0.581E-04, 1.1167E-04" 0.86 0.1756 13 age of intrusion 16902 1 14.9 0.6 muscovite conventional K-Ar CN83-38 "4.962E-04, 0.581E-04, 1.1167E-04" 3.2 0.6916 58 age of intrusion 16903 1 15 0.6 alunite conventional K-Ar CN82-62A "4.962E-04, 0.581E-04, 1.1167E-04" 1.24 0.2696 18 age of intrusion 16904 1 15.4 1 alunite conventional K-Ar CN82-64 "4.962E-04, 0.581E-04, 1.1167E-04" 0.33 0.0732 5 age of intrusion 16905 1 15.9 1 alunite conventional K-Ar CNS84-7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.08 0.2476 16 age of intrusion 16906 1 16 1.6 alunite conventional K-Ar VC84-5B "4.962E-04, 0.581E-04, 1.1167E-04" 3.47 0.8055 29 age of intrusion 16907 1 16.3 0.5 alunite conventional K-Ar CN83-50 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.3048 19 age of intrusion 16908 1 13.3 0.6 plagioclase conventional K-Ar CN83-11 "4.962E-04, 0.581E-04, 1.1167E-04" 4.21 0.8578 43 age of intrusion 16909 1 14.3 0.5 plagioclase conventional K-Ar CN83-6A "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.0968 25 age of intrusion 16910 1 15 1.6 plagioclase conventional K-Ar CN83-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.51 0.1149 21 age of intrusion 16911 1 16.9 1.8 plagioclase conventional K-Ar CN83-6A "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.1212 25 age of intrusion 16912 1 13.6 0.6 plagioclase conventional K-Ar CN84-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.1214 11 age of volcanism 16912 2 10.6 0.4 whole rock conventional K-Ar CN84-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.27 0.1935 26 minimum age of volcanism 16913 1 13.2 1.3 plagioclase conventional K-Ar CN84-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 0.0555 8 age of volcanism 16913 2 14.3 0.5 whole rock conventional K-Ar CN84-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.7 0.3511 62 age of volcanism 16914 1 13.6 0.8 plagioclase conventional K-Ar CN85-40 "4.962E-04, 0.581E-04, 1.1167E-04" 0.64 0.1246 8 age of volcanism 16915 1 13.3 0.7 plagioclase conventional K-Ar CN85-41 "4.962E-04, 0.581E-04, 1.1167E-04" 0.32 0.0608 10 age of volcanism 16916 1 20.1 1.4 hornblende conventional K-Ar CN83-20 "4.962E-04, 0.581E-04, 1.1167E-04" 0.76 0.2269 26 age of volcanism 16917 1 18.1 0.8 hornblende conventional K-Ar CN85-52 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.162 10 age of volcanism 16918 1 16.6 0.6 hornblende conventional K-Ar CN83-61 "4.962E-04, 0.581E-04, 1.1167E-04" 0.54 0.1283 14 age of volcanism 16919 1 14.4 0.4 biotite conventional K-Ar tunnel "4.962E-04, 0.581E-04, 1.1167E-04" 7.5 1.607 62 age of intrusion 16920 1 14.7 0.4 plagioclase conventional K-Ar C7A "4.962E-04, 0.581E-04, 1.1167E-04" 1.11 0.242 37 age of intrusion 16921 1 13.9 0.5 K feldspar conventional K-Ar EX896 "4.962E-04, 0.581E-04, 1.1167E-04" 9.33 1.924 38 age of intrusion 16921 2 13 0.8 hornblende conventional K-Ar EX896 "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.0912 20 age of intrusion chloritized hbl 16921 3 10.8 0.8 plagioclase conventional K-Ar EX896 "4.962E-04, 0.581E-04, 1.1167E-04" 1.59 0.255 17 minimum age of intrusion 16922 1 12.4 1.1 hornblende conventional K-Ar peak "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.0899 15 age of intrusion chloritized hbl 16923 1 11.6 0.4 plagioclase conventional K-Ar CN85-51 "4.962E-04, 0.581E-04, 1.1167E-04" 2.75 0.0461 38 age of intrusion 16924 1 84.9 4 hornblende conventional K-Ar CN83-21 "4.962E-04, 0.581E-04, 1.1167E-04" 0.76 0.9792 54 age not evaluated 16924 2 60.6 2.2 K feldspar conventional K-Ar CN83-21 "4.962E-04, 0.581E-04, 1.1167E-04" 14 0.1283 89 age not evaluated 16925 1 8.6 0.3 whole rock conventional K-Ar CN85-50 "4.962E-04, 0.581E-04, 1.1167E-04" 0.73 0.09 43 age of intrusion 16926 1 6.1 0.3 adularia conventional K-Ar willard "4.962E-04, 0.581E-04, 1.1167E-04" 15.6 1.3637 45 age of intrusion 16927 1 6.5 0.2 alunite conventional K-Ar SCO-AL "4.962E-04, 0.581E-04, 1.1167E-04" 9.45 0.8898 25 age of intrusion 16937 1 6.2 0.2 sanidine conventional K-Ar DN-CST "4.962E-04, 0.581E-04, 1.1167E-04" 6.61 0.5875 76 minimum age of volcanism "Young age attributed to insufficient fusion timees and inadequately high fusion temps, such that not all the 40Ar* was expelled from the melt." 16938 1 7.3 0.3 sanidine conventional K-Ar 3DN8-18A "4.962E-04, 0.581E-04, 1.1167E-04" 6.76 0.7067 40 minimum age of volcanism "Young age attributed to insufficient fusion timees and inadequately high fusion temps, such that not all the 40Ar* was expelled from the melt." 16939 1 7.54 0.03 sanidine 39Ar-40Ar incremental (plateau) BH86N33 "4.962E-04, 0.581E-04, 1.1167E-04" 94 age of volcanism % of radiogenic Ar was averaged by compiler 16940 1 7.61 0.03 sanidine 39Ar-40Ar incremental (plateau) BH86N9 "4.962E-04, 0.581E-04, 1.1167E-04" 94 age of volcanism % of radiogenic Ar was averaged by compiler 16941 1 7.53 0.19 sanidine 39Ar-40Ar incremental (plateau) 83G SPEAR "4.962E-04, 0.581E-04, 1.1167E-04" 91 age of volcanism % of radiogenic Ar was averaged by compiler one step in the analysis was rejected as too old (detrital contaminant suspected). 16942 1 7.69 0.13 sanidine 39Ar-40Ar incremental (plateau) LABCAN081 "4.962E-04, 0.581E-04, 1.1167E-04" 96 age of volcanism sample obtained from pumice fragment % of radiogenic Ar was averaged by compiler. Anomolously low value of 44.6% not included. 16952 1 18.9 0.9 whole rock conventional K-Ar 84-DJ-232 "4.962E-04, 0.581E-04, 1.1167E-04" 1.58 0.4271 6 age of volcanism 16953 1 24.9 0.6 biotite conventional K-Ar 83-DJ-97 "4.962E-04, 0.581E-04, 1.1167E-04" 8.07 2.9102 74 age of volcanism 16954 1 25.6 0.8 biotite conventional K-Ar 85-DJ-169 "4.962E-04, 0.581E-04, 1.1167E-04" 7.73 2.8719 71 age of volcanism 16955 1 24.1 0.7 biotite conventional K-Ar 84-DJ-126 "4.962E-04, 0.581E-04, 1.1167E-04" 8.51 2.9678 67 age of volcanism 16956 1 24.4 0.7 biotite conventional K-Ar 84-DJ-58 "4.962E-04, 0.581E-04, 1.1167E-04" 8.56 3.0203 76 age of volcanism 16957 1 21.8 0.7 sanidine conventional K-Ar 85-DJ-58 "4.962E-04, 0.581E-04, 1.1167E-04" 9.77 3.0786 81 age of volcanism 16958 1 18 0.5 alunite conventional K-Ar FMC-2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.82 1.2538 50 age of volcanism 16959 1 17.1 0.5 biotite conventional K-Ar P8698 "4.962E-04, 0.581E-04, 1.1167E-04" 7.72 1.9041 58 age of volcanism 16960 1 18.7 0.6 biotite conventional K-Ar 84-DJ-114 "4.962E-04, 0.581E-04, 1.1167E-04" 8.55 2.1378 63 age of volcanism 16961 1 14.2 0.8 hornblende conventional K-Ar 84-DJ-127 "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.0963 6 age of volcanism 16962 1 16.2 0.5 biotite conventional K-Ar 84-DJ-231 "4.962E-04, 0.581E-04, 1.1167E-04" 8.7 2.0435 46 age of intrusion 16963 1 23.2 0.7 sanidine conventional K-Ar 85-DJ-14 "4.962E-04, 0.581E-04, 1.1167E-04" 9.82 3.3043 65 age of volcanism 16964 1 23.2 0.7 biotite conventional K-Ar 85-DJ-13 "4.962E-04, 0.581E-04, 1.1167E-04" 8.77 2.9423 61 age of volcanism 16965 1 16.3 0.5 biotite conventional K-Ar 85-DJ-166 "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 1.9594 23 age of intrusion 16966 1 17.4 0.5 sericite conventional K-Ar 82-DJ-56 "4.962E-04, 0.581E-04, 1.1167E-04" 7.83 1.9676 47 age of intrusion 16967 1 23.6 0.7 biotite conventional K-Ar 85-DJ-151 "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 2.9042 70 age of volcanism 16968 1 22.3 0.7 sanidine conventional K-Ar 85-DJ-133 "4.962E-04, 0.581E-04, 1.1167E-04" 7.67 2.4794 72 age of volcanism 16969 1 22.9 0.7 biotite conventional K-Ar 85-DJ-125 "4.962E-04, 0.581E-04, 1.1167E-04" 8.71 2.8923 62 age of volcanism 16970 1 18.9 0.6 hornblende conventional K-Ar 85-DJ-67 "4.962E-04, 0.581E-04, 1.1167E-04" 0.753 0.2057 13 age of volcanism 16971 1 22.5 0.7 biotite conventional K-Ar 85-DJ-126 "4.962E-04, 0.581E-04, 1.1167E-04" 8.43 2.7455 56 age of volcanism 16972 1 20.2 0.8 hornblende conventional K-Ar WBS-67 "4.962E-04, 0.581E-04, 1.1167E-04" 0.817 2.3871 16 age of volcanism 16973 1 26.3 0.8 biotite conventional K-Ar RH-CM-36 "4.962E-04, 0.581E-04, 1.1167E-04" 8.8 3.3573 81 age of volcanism 16974 1 29.6 0.9 biotite conventional K-Ar RH-CM-35 "4.962E-04, 0.581E-04, 1.1167E-04" 4.32 1.8535 61 age of volcanism 16975 1 29.1 0.9 biotite conventional K-Ar RH-CM-34 "4.962E-04, 0.581E-04, 1.1167E-04" 8.71 3.6814 76 age of volcanism 16976 1 26 0.8 biotite conventional K-Ar WCS-61A "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 3.2089 50 age of volcanism 16977 1 29.1 0.9 biotite conventional K-Ar WOSS-34A "4.962E-04, 0.581E-04, 1.1167E-04" 8.11 3.4287 72 age of volcanism 16978 1 26.4 0.8 biotite conventional K-Ar WOSS-54A "4.962E-04, 0.581E-04, 1.1167E-04" 8.22 3.1428 59 age of volcanism 16979 1 26.7 0.8 biotite conventional K-Ar WCRS-21A "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 3.3894 61 age of volcanism 16980 1 7.2 0.3 whole rock conventional K-Ar 15158-31J "4.962E-04, 0.581E-04, 1.1167E-04" 1.727 1.7936 29 age of volcanism 16981 1 20 0.5 biotite conventional K-Ar 1-9-8J "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 2.6001 39 age of volcanism 16982 1 19.2 0.6 K feldspar conventional K-Ar 1-9-4J "4.962E-04, 0.581E-04, 1.1167E-04" 1.46 0.4054 26 age of volcanism 16983 1 11.8 0.6 hornblende conventional K-Ar 1-63-4Z "4.962E-04, 0.581E-04, 1.1167E-04" 1.088 1.8457 6 age of volcanism 16984 1 16.6 0.6 biotite conventional K-Ar 1-78-9J "4.962E-04, 0.581E-04, 1.1167E-04" 8.59 2.0666 33 age of volcanism 16985 1 30 0.9 biotite conventional K-Ar WI-391 "4.962E-04, 0.581E-04, 1.1167E-04" 8.65 3.7701 65 age of volcanism 16986 1 22.3 0.7 biotite conventional K-Ar WI-390 "4.962E-04, 0.581E-04, 1.1167E-04" 7.85 2.5338 47 age of volcanism 16987 1 22.5 0.7 biotite conventional K-Ar 15354-104 "4.962E-04, 0.581E-04, 1.1167E-04" 8.9 2.9011 38 age of volcanism 16988 1 17.1 0.5 whole rock conventional K-Ar 15354-25 "4.962E-04, 0.581E-04, 1.1167E-04" 3.11 0.7688 51 age of volcanism 16989 1 20.9 0.5 adularia conventional K-Ar Golden King "4.962E-04, 0.581E-04, 1.1167E-04" 15.9 4.8116 88 age of intrusion 16990 1 20.3 0.6 biotite conventional K-Ar 15327-72 "4.962E-04, 0.581E-04, 1.1167E-04" 8.52 2.4982 51 age of volcanism 16991 1 20.5 0.6 whole rock conventional K-Ar 11928-8 "4.962E-04, 0.581E-04, 1.1167E-04" 2.974 0.8833 42 age of volcanism 16992 1 28.3 0.9 biotite conventional K-Ar MCK DOM "4.962E-04, 0.581E-04, 1.1167E-04" 8.3 3.4186 75 age of volcanism 16993 1 27 0.8 biotite conventional K-Ar MJ-82-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.09 3.1331 74 age of volcanism 16994 1 25.8 0.8 biotite conventional K-Ar MJ-82-14 "4.962E-04, 0.581E-04, 1.1167E-04" 5.51 2.0583 25 age of volcanism 16995 1 25.5 0.8 biotite conventional K-Ar JEF-TOP "4.962E-04, 0.581E-04, 1.1167E-04" 8.46 3.1275 61 age of volcanism 16996 1 25.7 0.7 sanidine conventional K-Ar TING-83-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.76 4.0127 89 age of volcanism 16997 1 9.5 0.4 alunite conventional K-Ar RM-900-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.36 1.2841 17 age of intrusion 16998 1 9.8 0.2 alunite conventional K-Ar RM-32-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 1.3033 56 age of intrusion 16999 1 10.2 0.2 alunite conventional K-Ar RM-27-2 "4.962E-04, 0.581E-04, 1.1167E-04" 11.05 1.6268 60 age of intrusion 17000 1 28.2 0.8 biotite conventional K-Ar RH-TP-78 "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 3.3624 74 age of volcanism 17001 1 26.2 0.8 biotite conventional K-Ar RH-TP-228 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 3.3294 63 age of intrusion 17002 1 23.9 0.8 biotite conventional K-Ar RH-TP-337 "4.962E-04, 0.581E-04, 1.1167E-04" 8.44 2.9189 34 age of volcanism 17003 1 27.1 0.7 biotite conventional K-Ar RH-TP-102 "4.962E-04, 0.581E-04, 1.1167E-04" 7.74 3.0377 69 age of volcanism 17004 1 25.7 0.8 biotite conventional K-Ar RH-TP-378 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 3.108 57 age of volcanism 17005 1 26.4 0.8 biotite conventional K-Ar RH-TP-149 "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 3.2987 75 age of volcanism 17006 1 29.6 0.9 biotite conventional K-Ar RH-TP-545 "4.962E-04, 0.581E-04, 1.1167E-04" 7.8 3.3497 78 age of volcanism 17007 1 29.3 0.9 biotite conventional K-Ar RH-TP-475 "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 3.5223 63 age of intrusion 17008 1 26.2 0.8 biotite conventional K-Ar RH-TP-346 "4.962E-04, 0.581E-04, 1.1167E-04" 9.02 3.4313 72 age of intrusion 17009 1 25.1 0.8 biotite conventional K-Ar BTP-3ab "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 3.259 61 age of volcanism 17010 1 20 0.6 biotite conventional K-Ar TC8359 "4.962E-04, 0.581E-04, 1.1167E-04" 7.91 2.2904 33 age of volcanism 17011 1 24.6 0.7 K feldspar conventional K-Ar TC8360 "4.962E-04, 0.581E-04, 1.1167E-04" 5.09 1.8149 74 age of volcanism 17012 1 25.9 0.8 biotite conventional K-Ar T2163-15K "4.962E-04, 0.581E-04, 1.1167E-04" 8.21 3.0788 46 age of intrusion 17013 1 35.3 1.1 biotite conventional K-Ar RH-AR-125 "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 4.4249 80 age of volcanism 17014 1 33.7 1.1 biotite conventional K-Ar RH-AR-42 "4.962E-04, 0.581E-04, 1.1167E-04" 8.76 4.2867 91 age of volcanism 17015 1 34.3 1.1 biotite conventional K-Ar RH-AR-121 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 4.3271 84 age of volcanism 17077 1 13.9 0.3 biotite conventional K-Ar JN85BM-2 "4.962E-04, 0.581E-04, 1.1167E-04" 8.47 1.705 68 age of intrusion 17078 1 13.8 0.2 biotite conventional K-Ar JN85BM-3 "4.962E-04, 0.581E-04, 1.1167E-04" 8.61 1.72 58 age of intrusion 17079 1 10.7 0.2 whole rock conventional K-Ar 102887-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.81 0.2799 69 age of volcanism 17080 1 8.2 0.4 biotite conventional K-Ar R85-BIB "4.962E-04, 0.581E-04, 1.1167E-04" 7.98 0.9434 10 age of volcanism 17080 2 8.7 0.2 feldspar conventional K-Ar R85-BIB "4.962E-04, 0.581E-04, 1.1167E-04" 1.05 0.1317 55 age of volcanism 17080 3 7.7 0.1 feldspar conventional K-Ar R85-BIB "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 0.118 56 age of volcanism feldspar (backpicked) 17081 1 51.6 1.3 muscovite conventional K-Ar 83-89 "4.962E-04, 0.581E-04, 1.1167E-04" 9.55 7.187 71 age reset by thermal event 17081 2 46 1.2 biotite conventional K-Ar 83-89 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 5.724 59 age reset by thermal event 17082 1 45.2 0.3 muscovite conventional K-Ar JN85B-3 "4.962E-04, 0.581E-04, 1.1167E-04" 9.87 6.503 87 age reset by thermal event 17082 2 44.3 muscovite conventional K-Ar JN85B-3 "4.962E-04, 0.581E-04, 1.1167E-04" 9.87 6.372 79 age reset by thermal event 17082 3 48.6 0.3 biotite conventional K-Ar JN85B-3 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 6.529 90 age reset by thermal event 17082 4 49.2 0.4 biotite conventional K-Ar JN85B-3 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 6.61 80 age reset by thermal event 17083 1 26.1 1.7 hornblende conventional K-Ar 2-489 "4.962E-04, 0.581E-04, 1.1167E-04" 0.853 0.3223 28 age meaning uncertain (geologic factors) 17083 2 16.6 1.2 biotite conventional K-Ar 2-489 "4.962E-04, 0.581E-04, 1.1167E-04" 7.14 1.718 29 age meaning uncertain (geologic factors) 17121 1 200 7 polyhalite conventional K-Ar E9-84 "4.962E-04, 0.581E-04, 1.1167E-04" 14.94 45.374 93 Age of Deposition 17122 1 212 7 polyhalite conventional K-Ar E9-59 "4.962E-04, 0.581E-04, 1.1167E-04" 14.32 46.224 86 Age of Deposition 17123 1 216 7 polyhalite conventional K-Ar E9-15 "4.962E-04, 0.581E-04, 1.1167E-04" 14.88 48.977 77 Age of Deposition 17124 1 198 7 polyhalite conventional K-Ar MCC-M121 "4.962E-04, 0.581E-04, 1.1167E-04" 15.02 45.111 91 Age of Deposition 17125 1 212 7 polyhalite conventional K-Ar 2S/638.2 "4.962E-04, 0.581E-04, 1.1167E-04" 13.61 43.948 89 Age of Deposition 17126 1 174 6 polyhalite conventional K-Ar E9-99 "4.962E-04, 0.581E-04, 1.1167E-04" 14.16 37.142 90 Polyhalite & Sylvite & Halite "Age too young, Argon loss" 17127 1 154 5 polyhalite conventional K-Ar A8-18 "4.962E-04, 0.581E-04, 1.1167E-04" 14.68 33.84 87 Polyhalite & Sylvite "Age too young, Argon loss" 17128 1 21.4 0.8 polyhalite conventional K-Ar MB-76-22 "4.962E-04, 0.581E-04, 1.1167E-04" 14.63 4.5199 32 Age of Deposition 17129 1 10.6 1.5 whole rock conventional K-Ar 188 c25 minimum age of volcanism 17129 2 10.8 1.5 whole rock conventional K-Ar 188 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism 17130 1 33.2 1.5 biotite conventional K-Ar 190 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17130 2 33.9 1.5 biotite conventional K-Ar 190 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17131 1 32.2 1.5 biotite conventional K-Ar 191 "4.83E-04, 0.585E-04" age of volcanism 17131 2 32.6 1.5 biotite conventional K-Ar 191 "4.83E-04, 0.585E-04" age of volcanism 17132 1 36.5 1.5 biotite conventional K-Ar 192 "4.83E-04, 0.585E-04" age of volcanism 17132 2 37.7 1.5 biotite conventional K-Ar 192 "4.83E-04, 0.585E-04" age of volcanism 17132 3 31.8 1.5 whole rock conventional K-Ar 192 "4.83E-04, 0.585E-04" Ar leak likely 17132 4 31.9 1.5 whole rock conventional K-Ar 192 "4.83E-04, 0.585E-04" Ar leak likely 17136 1 2.24 0.12 biotite 39Ar-40Ar total fusion M-3 "4.962E-04, 0.581E-04, 1.1167E-04" 21 age of volcanism 17137 1 2.44 0.26 biotite 39Ar-40Ar total fusion T-1 "4.962E-04, 0.581E-04, 1.1167E-04" 9 age of volcanism 17138 1 72.4 3.1 sanidine conventional K-Ar jkr-54a "4.962E-04, 0.581E-04, 1.1167E-04" 3.83 4.057 79 age of volcanism 17138 2 76.1 2.8 biotite conventional K-Ar jkr-54b "4.962E-04, 0.581E-04, 1.1167E-04" 7.692 8.618 78 age of volcanism 17138 3 73.2 2.7 biotite conventional K-Ar jkr-54c "4.962E-04, 0.581E-04, 1.1167E-04" 7.642 7.933 76 age of volcanism 17138 4 74.4 2.6 sanidine conventional K-Ar jkr-54d "4.962E-04, 0.581E-04, 1.1167E-04" 12.124 13.259 89 age of volcanism 17139 1 75 2.7 sanidine conventional K-Ar jkr-62a "4.962E-04, 0.581E-04, 1.1167E-04" 11.293 13.015 94 age of volcanism 17140 1 69.8 2.5 sanidine conventional K-Ar jkr-93a "4.962E-04, 0.581E-04, 1.1167E-04" 11.252 11.538 84 age of volcanism 17141 1 9.56 0.24 whole rock conventional K-Ar D-212 "4.962E-04, 0.581E-04, 1.1167E-04" 1.125 1551 63 age of volcanism groundmass only 17142 1 10.67 0.3 whole rock conventional K-Ar D-209 "4.962E-04, 0.581E-04, 1.1167E-04" 0.424 1024 43 age of volcanism groundmass only 17143 1 10.3 0.3 whole rock conventional K-Ar D-83-49 "4.962E-04, 0.581E-04, 1.1167E-04" 1.096 1625 46 age of volcanism groundmass only 17144 1 10.3 0.3 whole rock conventional K-Ar 7-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.964 0.1432 45 age of volcanism groundmass only 17145 1 10.17 0.24 whole rock conventional K-Ar 15-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 2.168 0.3182 81 age of volcanism groundmass only 17146 1 14.05 0.33 whole rock conventional K-Ar 33-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 1.209 2453 74 age of volcanism groundmass only 17147 1 10.4 0.3 plagioclase conventional K-Ar 30-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 1.335 2007 77 age of volcanism 17148 1 3.98 0.18 biotite conventional K-Ar 16-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 7.379 0.423 23 age of volcanism 17149 1 9.93 0.2 plagioclase conventional K-Ar 11a-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.797 0.1141 59 age of volcanism 17150 1 12.4 0.4 plagioclase conventional K-Ar 11b-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.194 0.0347 54 age of volcanism 17151 1 11.9 0.3 plagioclase conventional K-Ar 55-84-MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.727 0.125 54 age of volcanism 17152 1 10.57 0.26 whole rock conventional K-Ar p-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.815 0.1242 74 age of volcanism groundmass only 17153 1 13.9 0.4 feldspar conventional K-Ar 16a-85-MJA MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.654 0.1311 45 age of volcanism 17154 1 10.9 0.3 feldspar conventional K-Ar 16b-85-MJA MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.875 0.1379 56 age of volcanism 17155 1 10.59 0.31 feldspar conventional K-Ar 15-85-MJA MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.562 0.0857 42 age of volcanism groundmass / feldspar 17156 1 6.73 0.18 feldspar conventional K-Ar tm-11-13-1 MJA "4.962E-04, 0.581E-04, 1.1167E-04" 0.977 0.0948 56 age of volcanism groundmass / feldspar 17158 1 28.41 1.2 alunite conventional K-Ar 109 MJA "4.962E-04, 0.581E-04, 1.1167E-04" 4.666 19.22 age of volcanism 17159 1 26.99 1.1 sanidine conventional K-Ar 136 "4.962E-04, 0.581E-04, 1.1167E-04" 7.514 2.94 age of volcanism 17168 1 77.2 2.8 sanidine conventional K-Ar dmt80-66 "4.962E-04, 0.581E-04, 1.1167E-04" 7 7.949 85 age of volcanism 17169 1 77.3 2.9 sanidine conventional K-Ar dmt80-64 "4.962E-04, 0.581E-04, 1.1167E-04" 7.38 8.386 94 age of volcanism 17170 1 76.3 2.7 sanidine conventional K-Ar dmt80-60 "4.962E-04, 0.581E-04, 1.1167E-04" 7.55 8.467 96 age of volcanism 17171 1 3.73 0.09 whole rock conventional K-Ar mt9 "4.962E-04, 0.581E-04, 1.1167E-04" 2.887 0.1553 60 age of volcanism Groundmass 17172 1 3.26 0.31 whole rock conventional K-Ar mt138 "4.962E-04, 0.581E-04, 1.1167E-04" 1.095 0.0513 10 age of volcanism Groundmass 17172 2 Unk conventional K-Ar mt138 "4.962E-04, 0.581E-04, 1.1167E-04" Groundmass 17173 1 2.89 0.07 whole rock conventional K-Ar mt7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.868 0.0778 67 age of volcanism Groundmass 17174 1 2.01 0.05 whole rock conventional K-Ar mt22 "4.962E-04, 0.581E-04, 1.1167E-04" 2.032 0.0589 56 age of volcanism Groundmass 17175 1 2.37 0.14 biotite conventional K-Ar mt135 "4.962E-04, 0.581E-04, 1.1167E-04" 8.208 0.28 14 age of volcanism 17176 1 1.5 0.06 plagioclase conventional K-Ar mt38 "4.962E-04, 0.581E-04, 1.1167E-04" 1.054 0.0228 59 age of volcanism 17177 1 2.6 0.05 whole rock conventional K-Ar 7/12/1999 "4.962E-04, 0.581E-04, 1.1167E-04" 3.721 0.1394 70 age of volcanism groundmass 17177 2 Unk conventional K-Ar 7/12/1999 "4.962E-04, 0.581E-04, 1.1167E-04" groundmass 17178 1 2.52 0.07 whole rock conventional K-Ar mt97 "4.962E-04, 0.581E-04, 1.1167E-04" 4.427 0.1603 51 age of volcanism groundmass 17179 1 2.79 0.05 whole rock conventional K-Ar mt3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.052 0.1628 80 age of volcanism groundmass 17180 1 2.87 0.08 whole rock conventional K-Ar mt79 "4.962E-04, 0.581E-04, 1.1167E-04" 3.781 0.156 37 age of volcanism groundmass 17181 1 2.88 0.12 biotite conventional K-Ar mt1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.011 0.3322 24 age of volcanism 17182 1 2.87 0.08 whole rock conventional K-Ar mt79 "4.962E-04, 0.581E-04, 1.1167E-04" 3.781 0.156 37 age of volcanism Groundmass 17182 2 Unk conventional K-Ar mt79 "4.962E-04, 0.581E-04, 1.1167E-04" Groundmass 17183 1 2.79 0.05 whole rock conventional K-Ar mt3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.052 0.1628 80 age of volcanism Groundmass 17184 1 2.64 0.08 whole rock conventional K-Ar mt27 "4.962E-04, 0.581E-04, 1.1167E-04" 3.881 0.1477 34 age of volcanism Groundmass 17185 1 3.03 0.11 biotite conventional K-Ar mt144 "4.962E-04, 0.581E-04, 1.1167E-04" 8.557 0.733 37 age of volcanism 17186 1 3.3 0.08 whole rock conventional K-Ar mt18 "4.962E-04, 0.581E-04, 1.1167E-04" 3.682 0.1748 63 age of volcanism Groundmass 17190 1 0.35 0.02 sanidine conventional K-Ar 1815 "4.962E-04, 0.581E-04, 1.1167E-04" 10.82 0.0539 25 age of volcanism 17191 1 1.11 0.02 sanidine conventional K-Ar 1838 "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 0.1647 45 age of volcanism 17192 1 0.43 0.05 sanidine conventional K-Ar 1839 "4.962E-04, 0.581E-04, 1.1167E-04" 10.079 0.0631 8 age of volcanism 17193 1 1.34 0.29 whole rock conventional K-Ar 2658 "4.962E-04, 0.581E-04, 1.1167E-04" 1.624 0.0314 5 0 Age may not be precise 17194 1 0.26 0.04 sanidine conventional K-Ar 2668 "4.962E-04, 0.581E-04, 1.1167E-04" 10.674 0.0401 7 age of volcanism Age may not be precise 17195 1 0.53 0.03 sanidine conventional K-Ar 2669 "4.962E-04, 0.581E-04, 1.1167E-04" 11.272 0.0853 15 age of volcanism Age may not be precise 17196 1 1.05 0.03 whole rock conventional K-Ar 2703r2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.609 0.0243 30 age of volcanism Age may not be precise 17197 1 1.33 0.53 whole rock conventional K-Ar 2704 "4.962E-04, 0.581E-04, 1.1167E-04" 1.362 0.0261 3 age of volcanism Age may not be precise 17198 1 1.46 0.06 whole rock conventional K-Ar 2705 "4.962E-04, 0.581E-04, 1.1167E-04" 1.4 0.0294 25 age of volcanism 17199 1 0.84 0.05 whole rock conventional K-Ar 2716r2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.389 0.0167 17 age of volcanism 17200 1 0.47 0.04 sanidine conventional K-Ar 2723 "4.962E-04, 0.581E-04, 1.1167E-04" 10.604 0.0721 12 age of volcanism 17201 1 1.02 0.04 whole rock conventional K-Ar 2844 "4.962E-04, 0.581E-04, 1.1167E-04" 4.551 0.0671 28 age of volcanism 17202 1 0.35 0.02 sanidine conventional K-Ar 2866 "4.962E-04, 0.581E-04, 1.1167E-04" 10.488 0.0522 47 age of volcanism 17203 1 0.92 0.03 whole rock conventional K-Ar 2867 "4.962E-04, 0.581E-04, 1.1167E-04" 3.438 0.0459 27 age of volcanism 17204 1 1.06 0.02 sanidine conventional K-Ar 2868 "4.962E-04, 0.581E-04, 1.1167E-04" 11.056 0.1694 63 age of volcanism 17205 1 0.64 0.03 whole rock conventional K-Ar 2890 "4.962E-04, 0.581E-04, 1.1167E-04" 4.74 0.0434 19 age of volcanism 17206 1 0.6 0.02 sanidine conventional K-Ar 2911 "4.962E-04, 0.581E-04, 1.1167E-04" 9.211 0.0793 44 age of volcanism 17207 1 0.56 0.02 whole rock conventional K-Ar 2922 "4.962E-04, 0.581E-04, 1.1167E-04" 4.736 0.0383 38 age of volcanism 17208 1 0.4 0.04 whole rock conventional K-Ar 2961 "4.962E-04, 0.581E-04, 1.1167E-04" 3.44 0.0199 9 age of volcanism 17209 1 1.71 0.21 whole rock conventional K-Ar 2968 "4.962E-04, 0.581E-04, 1.1167E-04" 1.286 0.0316 8 age of volcanism 17210 1 1.66 0.1 whole rock conventional K-Ar 2969 "4.962E-04, 0.581E-04, 1.1167E-04" 1.548 0.037 16 0 Age may not be precise 17211 1 0.61 0.02 sanidine conventional K-Ar 2972 "4.962E-04, 0.581E-04, 1.1167E-04" 11.22 0.0984 55 age of volcanism 17212 1 1.2 0.3 biotite conventional K-Ar 2973 "4.962E-04, 0.581E-04, 1.1167E-04" 7.449 0.1276 5 age of volcanism 17213 1 0.86 0.02 sanidine conventional K-Ar 2974 "4.962E-04, 0.581E-04, 1.1167E-04" 11.208 0.1394 51 age of volcanism 17214 1 0.41 0.06 sanidine conventional K-Ar 2975 "4.962E-04, 0.581E-04, 1.1167E-04" 11.245 0.0661 7 age of volcanism 17215 1 1.15 0.02 sanidine conventional K-Ar 2976 "4.962E-04, 0.581E-04, 1.1167E-04" 10.499 0.1738 80 age of volcanism 17216 1 0.52 0.06 whole rock conventional K-Ar 2978 "4.962E-04, 0.581E-04, 1.1167E-04" 2.818 0.0211 9 age of volcanism 17217 1 0.56 0.02 sanidine conventional K-Ar 2980 "4.962E-04, 0.581E-04, 1.1167E-04" 11.216 0.0874 72 age of volcanism 17218 1 0.5 0.02 sanidine conventional K-Ar 2982 "4.962E-04, 0.581E-04, 1.1167E-04" 10.363 0.0751 39 age of volcanism 17219 1 1.45 0.12 whole rock conventional K-Ar 2983 "4.962E-04, 0.581E-04, 1.1167E-04" 1.793 0.0374 12 0 Age may not be precise 17220 1 0.48 0.03 whole rock conventional K-Ar 2984 "4.962E-04, 0.581E-04, 1.1167E-04" 2.596 0.0178 14 age of volcanism 17221 1 1 0.05 whole rock conventional K-Ar 2985 "4.962E-04, 0.581E-04, 1.1167E-04" 1.515 0.0218 21 age of volcanism 17222 1 1.96 0.06 whole rock conventional K-Ar 2986 "4.962E-04, 0.581E-04, 1.1167E-04" 1.205 0.0339 31 age of volcanism 17223 1 2.06 0.02 sanidine conventional K-Ar 2987 "4.962E-04, 0.581E-04, 1.1167E-04" 11.197 0.3319 84 age of volcanism 17223 2 Unk conventional K-Ar 2987 "4.962E-04, 0.581E-04, 1.1167E-04" 17224 1 0.98 0.09 whole rock conventional K-Ar 2988 "4.962E-04, 0.581E-04, 1.1167E-04" 2.746 0.0389 10 age of volcanism 17225 1 0.44 0.08 whole rock conventional K-Ar 2989 "4.962E-04, 0.581E-04, 1.1167E-04" 1.056 0.0067 5 0 Age may not be precise 17226 1 0.57 0.02 sanidine conventional K-Ar 2990 "4.962E-04, 0.581E-04, 1.1167E-04" 11.798 0.0974 43 age of volcanism 17227 1 1.66 0.12 whole rock conventional K-Ar 2991r3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.472 0.0113 13 Age may not be precise 17228 1 0.93 0.05 whole rock conventional K-Ar 2992 "4.962E-04, 0.581E-04, 1.1167E-04" 1.44 0.0194 17 age of volcanism Age may not be precise 17229 1 0.6 0.02 sanidine conventional K-Ar 2993 "4.962E-04, 0.581E-04, 1.1167E-04" 11.667 0.1004 30 age of volcanism Age may not be precise 17230 1 0.59 0.02 sanidine conventional K-Ar 2994 "4.962E-04, 0.581E-04, 1.1167E-04" 10.561 0.0891 52 age of volcanism Age may not be precise 17231 1 0.44 0.03 whole rock conventional K-Ar 2996 "4.962E-04, 0.581E-04, 1.1167E-04" 2.568 0.0162 20 age of volcanism Age may not be precise 17232 1 0.83 0.03 whole rock conventional K-Ar 2998 "4.962E-04, 0.581E-04, 1.1167E-04" 2.535 0.0302 29 age of volcanism Age may not be precise 17233 1 0.88 0.02 whole rock conventional K-Ar 2999 "4.962E-04, 0.581E-04, 1.1167E-04" 2.679 0.0338 44 age of volcanism Age may not be precise 17234 1 0.9 0.04 whole rock conventional K-Ar 3000 "4.962E-04, 0.581E-04, 1.1167E-04" 3.513 0.0453 24 age of volcanism Age may not be precise 17235 1 0.81 0.06 whole rock conventional K-Ar 3001 "4.962E-04, 0.581E-04, 1.1167E-04" 3.155 0.037 13 age of volcanism Age may not be precise 17236 1 1.06 0.03 whole rock conventional K-Ar 3153 "4.962E-04, 0.581E-04, 1.1167E-04" 2.59 0.0395 20 age of volcanism Age may not be precise 17237 1 1.11 0.02 sanidine conventional K-Ar 3154 "4.962E-04, 0.581E-04, 1.1167E-04" 11.024 0.1764 64 age of volcanism Age may not be precise 17238 1 1.98 0.35 whole rock conventional K-Ar 3155 "4.962E-04, 0.581E-04, 1.1167E-04" 1.942 0.0553 6 age of volcanism Age may not be precise 17239 1 0.82 0.02 sanidine conventional K-Ar 3185 "4.962E-04, 0.581E-04, 1.1167E-04" 11.992 0.1405 73 age of volcanism Age may not be precise 17240 1 0.89 0.03 whole rock conventional K-Ar 3197 "4.962E-04, 0.581E-04, 1.1167E-04" 2.818 0.0361 27 age of volcanism Age may not be precise 17241 1 0.97 0.03 whole rock conventional K-Ar 3202 "4.962E-04, 0.581E-04, 1.1167E-04" 2.015 0.0279 36 age of volcanism Age may not be precise 17242 1 0.53 0.02 sanidine conventional K-Ar 3204 "4.962E-04, 0.581E-04, 1.1167E-04" 10.894 0.0809 64 age of volcanism Age may not be precise 17251 1 3.9 0.2 whole rock conventional K-Ar mo-84-8a "4.962E-04, 0.581E-04, 1.1167E-04" 0.685 0.0382 9 age of volcanism 17252 1 3.4 0.1 whole rock conventional K-Ar kv-84-7a "4.962E-04, 0.581E-04, 1.1167E-04" 2.727 0.1329 0 age of volcanism 17253 1 3 0.1 whole rock conventional K-Ar kv902 "4.962E-04, 0.581E-04, 1.1167E-04" 2.585 0.1098 11 age of volcanism 17254 1 12.2 0.4 whole rock conventional K-Ar Lp-81-7a "4.962E-04, 0.581E-04, 1.1167E-04" 1.36 0.24 55 age of volcanism 17255 1 11.8 0.2 whole rock conventional K-Ar kv-84-5a "4.962E-04, 0.581E-04, 1.1167E-04" 1.706 0.2917 23 age of volcanism 17256 1 12.8 0.7 whole rock conventional K-Ar LP-84-4a "4.962E-04, 0.581E-04, 1.1167E-04" 0.557 0.1033 23 age of volcanism 17257 1 11.5 0.1 whole rock conventional K-Ar kv-84-3a "4.962E-04, 0.581E-04, 1.1167E-04" 1.907 0.3157 40 age of volcanism 17258 1 10.6 0.2 whole rock conventional K-Ar kv-84-1a "4.962E-04, 0.581E-04, 1.1167E-04" 2.404 0.3689 28 age of volcanism 17259 1 11.5 1 whole rock conventional K-Ar LP-84-2a "4.962E-04, 0.581E-04, 1.1167E-04" 1.982 0.3303 36 age of volcanism 17262 1 112.9 3 common micas conventional K-Ar 311 "4.962E-04, 0.581E-04, 1.1167E-04" 10.1 16.944 90 age of intrusion 17263 1 4 common micas conventional K-Ar 378A "4.962E-04, 0.581E-04, 1.1167E-04" 10.63 19.145 96 age of intrusion 17264 1 143.7 4 common micas conventional K-Ar B900 "4.962E-04, 0.581E-04, 1.1167E-04" 10.57 22.764 99 age of intrusion 17266 1 111.6 3 common micas conventional K-Ar 504 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 15.265 98 age of intrusion 17267 1 112.5 3 common micas conventional K-Ar 551 "4.962E-04, 0.581E-04, 1.1167E-04" 8.99 15.019 93 age of intrusion 17268 1 126.7 3 common micas conventional K-Ar AR1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.34 0.6472 51 age of intrusion 17269 1 34.7 1.2 biotite conventional K-Ar CM-1-77 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17270 1 16.3 0.4 sanidine conventional K-Ar CR-1-74 "4.962E-04, 0.581E-04, 1.1167E-04" CT140 RESET BY THERMAL EVENT. 17270 2 15.3 0.6 sanidine conventional K-Ar CR-1-74 "4.962E-04, 0.581E-04, 1.1167E-04" CT140 RESET BY THERMAL EVENT. 17271 1 34.2 0.8 biotite conventional K-Ar CR-2-73 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17271 2 32 0.8 sanidine conventional K-Ar T-2-73 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17272 1 29.2 1 sanidine conventional K-Ar H-9-77 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17273 1 29.7 1.5 biotite conventional K-Ar UP-Ttc "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17274 1 25.7 1.7 biotite conventional K-Ar UP-G-15B "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17274 2 28.7 1 biotite conventional K-Ar UP-G-15B "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17275 1 27.4 1.3 biotite conventional K-Ar UP-G-26 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17275 2 37.7 1.5 plagioclase conventional K-Ar UP-G-26 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17276 1 30.1 1 biotite conventional K-Ar UP-G-58 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17277 1 30.5 1.5 biotite conventional K-Ar UP-G-73 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17278 1 28.5 1 biotite conventional K-Ar HM-16-81 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17279 1 28.6 1 biotite conventional K-Ar UP-G23 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17279 2 28.5 1 sanidine conventional K-Ar UP-G23 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17280 1 28 1 biotite conventional K-Ar MM-1A-74 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17280 2 27.1 0.9 sanidine conventional K-Ar MM-1A-74 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17281 1 26.9 0.9 sanidine conventional K-Ar MM-2-74 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17282 1 27.7 0.9 sanidine conventional K-Ar MM-3-74 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17283 1 27.4 0.9 sanidine conventional K-Ar MM-4-74 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17284 1 27.3 1.5 sanidine conventional K-Ar UP-G-48 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17284 2 26.1 0.9 sanidine conventional K-Ar UP-G-48 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17285 1 28.8 1 biotite conventional K-Ar UP-G24 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17285 2 28.2 1 sanidine conventional K-Ar UP-G24 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17286 1 27.7 0.9 sanidine conventional K-Ar RR-1-75 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17288 1 24.9 5.6 sphene conventional K-Ar GR-129A "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17289 1 30.6 1 biotite conventional K-Ar UP-G51 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17289 2 27.3 1.3 sanidine conventional K-Ar UP-G51 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17291 1 28 1 sanidine conventional K-Ar WL-1-79 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17294 1 28.1 1 biotite conventional K-Ar MR-5-76 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17297 1 28.4 0.8 sanidine conventional K-Ar UP-G84 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17298 1 27.7 2 biotite conventional K-Ar UP-ARS "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17300 1 27.7 0.9 sanidine conventional K-Ar WL-2A-79 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17301 1 1 0.1 whole rock conventional K-Ar SS-1-77 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17302 1 13.7 1.4 whole rock conventional K-Ar SS-2-77 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17303 1 18.3 0.7 whole rock conventional K-Ar W-105-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17304 1 19 1.2 whole rock conventional K-Ar BL-25-3B-81 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17305 1 19 0.7 whole rock conventional K-Ar BL-209-81 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17306 1 21.1 0.7 biotite conventional K-Ar W-50-79 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17308 1 18.7 0.9 plagioclase conventional K-Ar W-59-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17308 2 19.3 0.7 biotite conventional K-Ar W-59-80 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17315 1 139 7 whole rock conventional K-Ar LOC10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.73 3.6 79 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17316 1 125 13 whole rock conventional K-Ar C-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.1 2.044 32 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17317 1 128 10 whole rock conventional K-Ar E-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 2.288 32 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17318 1 140 8 whole rock conventional K-Ar FRONTENECK CREEK "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 1.027 65 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17319 1 121 23 whole rock conventional K-Ar TF3A "4.962E-04, 0.581E-04, 1.1167E-04" 1.05 1.877 58 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17320 1 130 13 whole rock conventional K-Ar D4B "4.962E-04, 0.581E-04, 1.1167E-04" 3.13 6.085 87 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17321 1 113 11 whole rock conventional K-Ar PORTLAND POINT "4.962E-04, 0.581E-04, 1.1167E-04" 0.61 1.022 64 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17322 1 176 17 whole rock conventional K-Ar MANHEIM DIKE "4.962E-04, 0.581E-04, 1.1167E-04" 2.14 5.687 81 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17323 1 146 8 whole rock conventional K-Ar ITHACA (CASCADILLA) "4.962E-04, 0.581E-04, 1.1167E-04" 1.6 3.491 85 CT 140 AGE OF ENEPLACEMENT IS MOST LIKELY 143 M.Y. 17325 1 332.38 phlogopite conventional K-Ar 1 "4.8E-04, 0.58E-04*" 9.809 51.541 CT 140 Sample badly weathered. 17326 1 366.76 biotite conventional K-Ar 2 "4.8E-04, 0.58E-04*" 6.025 35.278 age of metamorphic crystallization 17327 1 386 biotite conventional K-Ar 3 "4.8E-04, 0.58E-04*" 4.603 28.523 age of metamorphic crystallization 17328 1 357 phlogopite conventional K-Ar 4 "4.8E-04, 0.58E-04*" 8.543 48.539 age of metamorphic crystallization 17329 1 384 biotite conventional K-Ar 5 "4.8E-04, 0.58E-04*" 9.266 57.046 age of intrusion 17330 1 372 muscovite conventional K-Ar 6 "4.8E-04, 0.58E-04*" 10.23 60.799 age of intrusion 17331 1 378 biotite conventional K-Ar 7 "4.8E-04, 0.58E-04*" 9.351 56.545 age of intrusion 17331 2 379 muscovite conventional K-Ar 8 "4.8E-04, 0.58E-04*" 10.206 62 age of intrusion 17332 1 409 biotite conventional K-Ar 9 "4.8E-04, 0.58E-04*" 8.061 53.293 age of metamorphic crystallization 17333 1 449 biotite conventional K-Ar 10 "4.8E-04, 0.58E-04*" 6.965 51.166 age of metamorphic crystallization 17357 1 29.7 1.2 hornblende Not given "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion Hornbleude "No analytical data given: (Parke Snavely, Jr. U.S. Geological Survey)" 17358 1 2.8 0.06 whole rock conventional K-Ar 55-1 "4.962E-04, 0.581E-04, 1.1167E-04" 23233 0.8994 37 age of volcanism All avg by compiler 17359 1 3 0.9 whole rock conventional K-Ar s5-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.164 0.0071 1 age of volcanism 17360 1 3.44 0.13 whole rock conventional K-Ar s5-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.932 0.0415 14 age of volcanism All avg by comp 17361 1 3.62 0.12 plagioclase conventional K-Ar s5-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.352 0.0181 25 age of volcanism All avg by comp 17361 2 3.61 0.14 whole rock conventional K-Ar s5-8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.178 0.0095 9 age of volcanism All avg by comp 17363 1 3.68 0.08 whole rock conventional K-Ar s5-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.137 0.0602 48 age of volcanism All avg by comp 17364 1 4.47 0.28 plagioclase conventional K-Ar s5-12 "4.962E-04, 0.581E-04, 1.1167E-04" 0.216 0.0142 11 age of volcanism All avg by comp 17365 1 4.56 0.57 plagioclase conventional K-Ar s5-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.074 0.0048 13 age of volcanism All avg by comp 17366 1 5.78 0.12 plagioclase conventional K-Ar s5-7 "4.962E-04, 0.581E-04, 1.1167E-04" 0.557 0.0462 33 age of volcanism All avg by comp 17367 1 6.16 0.13 whole rock conventional K-Ar s5-9 "4.962E-04, 0.581E-04, 1.1167E-04" 0.917 0.0815 37 age of volcanism All avg by comp 17368 1 6.88 0.6 plagioclase conventional K-Ar s5-10 "4.962E-04, 0.581E-04, 1.1167E-04" 0.132 0.013 17 age of volcanism All avg by comp 17369 1 5.34 0.58 whole rock conventional K-Ar Devil 440 "4.962E-04, 0.581E-04, 1.1167E-04" 0.639 0.0492 87 age of intrusion 17370 1 9.5 1.3 whole rock conventional K-Ar DC-4 "4.962E-04, 0.581E-04, 1.1167E-04" 0.795 0.1089 90 age of volcanism 17371 1 6.3 0.22 whole rock conventional K-Ar DC-114 "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 0.1762 37 age of volcanism 17372 1 6 0.9 whole rock conventional K-Ar DC-14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.0514 91 age of volcanism 17373 1 13.8 0.8 plagioclase conventional K-Ar Ri-85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.426 0.0838 74 age of volcanism 17374 1 12.4 2.5 whole rock conventional K-Ar Tmwl "4.962E-04, 0.581E-04, 1.1167E-04" 0.53 0.095 93 age of intrusion 17375 1 13.2 0.7 whole rock conventional K-Ar Ri-22 "4.962E-04, 0.581E-04, 1.1167E-04" 1.591 0.3029 72 age of volcanism 17376 1 16.2 1.8 whole rock conventional K-Ar Cougar "4.962E-04, 0.581E-04, 1.1167E-04" 0.286 0.0669 87 age of volcanism 17377 1 9.31 0.44 whole rock conventional K-Ar Ri-136 "4.962E-04, 0.581E-04, 1.1167E-04" 0.91 0.1223 66 age of volcanism 17378 1 7.8 0.77 whole rock conventional K-Ar Ri-62 "4.962E-04, 0.581E-04, 1.1167E-04" 0.578 0.0651 86 age of volcanism 17379 1 9.41 0.42 whole rock conventional K-Ar Ri-64 "4.962E-04, 0.581E-04, 1.1167E-04" 1.675 0.2274 64 age of volcanism 17380 1 11.4 0.5 plagioclase conventional K-Ar Ri-112 "4.962E-04, 0.581E-04, 1.1167E-04" 0.251 0.0414 65 age of volcanism 17381 1 8.8 0.34 whole rock conventional K-Ar Tmw-top "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 0.1726 39 age of volcanism 17382 1 8.34 0.36 whole rock conventional K-Ar Tpb-Lo "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.0529 61 age of volcanism 17383 1 2.03 0.52 whole rock conventional K-Ar Foley Ridge "4.962E-04, 0.581E-04, 1.1167E-04" 0.66 0.0193 95 age of volcanism 17384 1 6.8 1.18 whole rock conventional K-Ar Mo-159 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4 0.0392 92 age of volcanism 17385 1 7.67 0.96 whole rock conventional K-Ar Mo-160 "4.962E-04, 0.581E-04, 1.1167E-04" 0.43 0.0476 89 age of volcanism 17386 1 10.2 1 whole rock conventional K-Ar Mo-eng-b "4.962E-04, 0.581E-04, 1.1167E-04" 0.23 0.034 86 age of volcanism 17387 1 2.23 0.37 whole rock conventional K-Ar Mb-133 "4.962E-04, 0.581E-04, 1.1167E-04" 0.521 0.0167 91 age of volcanism 17388 1 24.7 2 whole rock conventional K-Ar bb-16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.976 0.3489 83 age of intrusion 17389 1 21.9 2.9 whole rock conventional K-Ar bb-30 "4.962E-04, 0.581E-04, 1.1167E-04" 0.621 0.197 89 age of intrusion 17390 1 22 1 whole rock conventional K-Ar bb-35 "4.962E-04, 0.581E-04, 1.1167E-04" 0.651 0.2074 65 age of volcanism 17391 1 8.3 5.5 whole rock conventional K-Ar bb-pat "4.962E-04, 0.581E-04, 1.1167E-04" 0.121 0.0145 98 age of intrusion 17392 1 15.9 7.6 whole rock conventional K-Ar bb-nsh "4.962E-04, 0.581E-04, 1.1167E-04" 0.29 0.0668 97 age of intrusion 17393 1 5.81 0.3 whole rock conventional K-Ar bb-ppat "4.962E-04, 0.581E-04, 1.1167E-04" 1.097 0.0918 70 age of volcanism 17394 1 0.56 0.16 whole rock conventional K-Ar bb-tpba "4.962E-04, 0.581E-04, 1.1167E-04" 1.422 0.0114 95 age of volcanism 17395 1 21.3 1 plagioclase conventional K-Ar Om-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.41 0.1264 66 age of intrusion 17396 1 17.3 0.7 whole rock conventional K-Ar Om-49 "4.962E-04, 0.581E-04, 1.1167E-04" 0.91 0.2282 53 age of intrusion 17397 1 18.7 0.9 plagioclase conventional K-Ar Om-520 "4.962E-04, 0.581E-04, 1.1167E-04" 616 0.1667 67 age of intrusion 17398 1 15.6 0.6 whole rock conventional K-Ar T-10 "4.962E-04, 0.581E-04, 1.1167E-04" 1.326 0.2984 53 age of volcanism 17399 1 17 0.9 whole rock conventional K-Ar t-14 "4.962E-04, 0.581E-04, 1.1167E-04" 0.795 0.1957 72 age of volcanism 17400 1 13.5 1.1 whole rock conventional K-Ar p-624 "4.962E-04, 0.581E-04, 1.1167E-04" 1.072 0.2095 82 age of volcanism 17401 1 13.1 0.6 whole rock conventional K-Ar p-626 "4.962E-04, 0.581E-04, 1.1167E-04" 1.048 0.1985 68 age of volcanism 17402 1 14.1 0.8 whole rock conventional K-Ar T-fizz "4.962E-04, 0.581E-04, 1.1167E-04" 0.964 0.1964 74 age of intrusion 17403 1 17.3 0.8 whole rock conventional K-Ar P-509 "4.962E-04, 0.581E-04, 1.1167E-04" 0.807 0.2022 62 age of volcanism 17404 1 4.32 0.4 whole rock conventional K-Ar P-616 "4.962E-04, 0.581E-04, 1.1167E-04" 1.506 0.0937 85 age of volcanism 17405 1 5.56 0.34 whole rock conventional K-Ar P-phl "4.962E-04, 0.581E-04, 1.1167E-04" 1.085 0.0869 76 age of volcanism 17406 1 5.53 0.41 whole rock conventional K-Ar P-324 "4.962E-04, 0.581E-04, 1.1167E-04" 1.133 0.0903 81 age of volcanism 17407 1 1.98 0.25 whole rock conventional K-Ar P-22 "4.962E-04, 0.581E-04, 1.1167E-04" 0.856 0.0244 89 age of volcanism 17408 1 0.98 0.34 whole rock conventional K-Ar P-notch "4.962E-04, 0.581E-04, 1.1167E-04" 1.04 0.0147 96 age of volcanism 17409 1 0.77 0.2 whole rock conventional K-Ar T-208 "4.962E-04, 0.581E-04, 1.1167E-04" 0.747 0.0083 95 age of volcanism 17410 1 0.17 0.48 whole rock conventional K-Ar T-210 "4.962E-04, 0.581E-04, 1.1167E-04" 0.976 0.0024 99 age of volcanism 17411 1 0.97 0.46 whole rock conventional K-Ar T-211 "4.962E-04, 0.581E-04, 1.1167E-04" 0.819 0.0115 97 age of volcanism 17412 1 8.1 2.3 whole rock conventional K-Ar Ri-28 "4.962E-04, 0.581E-04, 1.1167E-04" 0.627 0.0734 95 age of intrusion 17417 1 430 whole rock conventional K-Ar Shale "4.962E-04, 0.581E-04, 1.1167E-04" 2.778 CT140The age for the shale may not be age of deposition for it contains a mixture of detrital and authigenic material. 17418 1 340 whole rock conventional K-Ar Mylonite "4.962E-04, 0.581E-04, 1.1167E-04" 2.482 "CT140 Young age is result of Ar, caused by heat and strain of nearby faults." 17432 1 34.8 4.9 plagioclase conventional K-Ar wp-468 "4.962E-04, 0.581E-04, 1.1167E-04" 0.32 0.162 44 age of volcanism 17433 1 34.5 1 biotite conventional K-Ar wp-473 "4.962E-04, 0.581E-04, 1.1167E-04" 7.65 3.841 67 age of volcanism 17434 1 38.8 1.4 biotite conventional K-Ar wp-469 "4.962E-04, 0.581E-04, 1.1167E-04" 7.48 4.22 73 age of volcanism 17434 2 37.2 2.3 plagioclase conventional K-Ar wp-469 "4.962E-04, 0.581E-04, 1.1167E-04" 0.62 0.3351 56 age of volcanism 17435 1 33.6 1.2 biotite conventional K-Ar wp-422 "4.962E-04, 0.581E-04, 1.1167E-04" 8.29 4.043 79 age of volcanism 17435 2 30.9 0.7 sanidine conventional K-Ar wp-422 "4.962E-04, 0.581E-04, 1.1167E-04" 11.63 5.225 92 age of volcanism 17436 1 38.5 1.4 biotite conventional K-Ar wp-421 "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 4.602 79 age of volcanism 17436 2 32 2.1 plagioclase conventional K-Ar wp-421 "4.962E-04, 0.581E-04, 1.1167E-04" 0.52 0.2414 71 age of volcanism 17437 1 29.9 1.1 biotite conventional K-Ar wp-480 "4.962E-04, 0.581E-04, 1.1167E-04" 8.73 3.787 71 age of volcanism 17438 1 34.9 1.3 biotite conventional K-Ar wp-479 "4.962E-04, 0.581E-04, 1.1167E-04" 8.83 4.473 83 age of volcanism 17438 2 32.7 1.2 sanidine conventional K-Ar wp-479 "4.962E-04, 0.581E-04, 1.1167E-04" 8.76 4.165 86 age of volcanism 17439 1 34.3 1.2 biotite conventional K-Ar wp-381 "4.962E-04, 0.581E-04, 1.1167E-04" 6.65 3.311 22 age of volcanism 17439 2 33.3 0.9 sanidine conventional K-Ar wp-381 "4.962E-04, 0.581E-04, 1.1167E-04" 11.16 5.402 88 age of volcanism 17440 1 32.8 3.3 plagioclase conventional K-Ar wp-461 "4.962E-04, 0.581E-04, 1.1167E-04" 0.4 0.1881 45 age of volcanism 17441 1 37.8 2.2 hornblende conventional K-Ar wp-435 "4.962E-04, 0.581E-04, 1.1167E-04" 0.88 0.4871 84 age of volcanism 17441 2 Unk conventional K-Ar wp-435 17441 3 37.7 2.4 plagioclase conventional K-Ar wp-435 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.3455 85 age of volcanism 17442 1 74.6 5 plagioclase conventional K-Ar wp-434 "4.962E-04, 0.581E-04, 1.1167E-04" 0.49 0.5372 79 age of volcanism 17443 1 33.6 1.2 biotite conventional K-Ar wp-478 "4.962E-04, 0.581E-04, 1.1167E-04" 7.86 3.84 72 age of volcanism 17444 1 35.4 1.3 biotite conventional K-Ar wp-485 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 4.605 82 age of volcanism 17444 2 30.6 1.1 sanidine conventional K-Ar wp-485 "4.962E-04, 0.581E-04, 1.1167E-04" 11.51 5.111 79 age of volcanism k2o % avg by comp 17444 3 35.2 2.2 plagioclase conventional K-Ar wp-485 "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.2402 75 age of volcanism 17445 1 35.2 1.3 biotite conventional K-Ar wp-433 "4.962E-04, 0.581E-04, 1.1167E-04" 8.81 4.503 67 age of volcanism 17446 1 23.2 0.8 biotite conventional K-Ar wp-483 "4.962E-04, 0.581E-04, 1.1167E-04" 3.13 1.051 63 age of intrusion 17447 1 36 1.3 biotite conventional K-Ar wp-475 "4.962E-04, 0.581E-04, 1.1167E-04" 8.22 4.302 75 age of intrusion 17448 1 33.6 1.4 biotite conventional K-Ar FGN-1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.398 3.027 37 age of intrusion K20% avg by comp 17449 1 23.5 1 biotite conventional K-Ar LE-T1m "4.962E-04, 0.581E-04, 1.1167E-04" 8.857 3.168 52 age of intrusion K20% avg by comp 17450 1 23.3 1.2 hornblende conventional K-Ar thmp-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.593 0.5314 58 age of intrusion K20% avg by comp 17451 1 23.3 0.8 biotite conventional K-Ar wp-482 "4.962E-04, 0.581E-04, 1.1167E-04" 8.42 2.849 64 age of intrusion 17452 1 23.8 0.9 biotite conventional K-Ar wp-481 "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 2.852 68 age of intrusion 17453 1 10.4 0.5 biotite conventional K-Ar mr-79-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.69 1.3082 62 age of intrusion 17453 2 11.8 0.6 hornblende conventional K-Ar mr-79-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.93 0.1588 69 age of intrusion 17454 1 9.06 0.34 whole rock conventional K-Ar mr-79-5 "4.962E-04, 0.581E-04, 1.1167E-04" 4.94 0.6462 50 age of intrusion 17455 1 9.63 0.55 whole rock conventional K-Ar mr-79-152 "4.962E-04, 0.581E-04, 1.1167E-04" 5.23 0.727 74 age of intrusion 17456 1 94.9 hornblende 39Ar-40Ar total fusion m81pr-82 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "8 heating steps from 650"" 1050""C" 17456 2 96.4 2.9 hornblende conventional K-Ar m81pr-82 "4.962E-04, 0.581E-04, 1.1167E-04" 0.89 1.269 63 age of volcanism 17458 1 37.5 2.6 biotite conventional K-Ar m80pr-28 "4.962E-04, 0.581E-04, 1.1167E-04" 2.15 1.172 24 age of volcanism Low K20 and radiogenic Ar make interp of data difficult. 17459 1 54.6 1.6 hornblende conventional K-Ar m82pr-79 "4.962E-04, 0.581E-04, 1.1167E-04" 0.838 0.669 48 age of intrusion Low K20 and radiogenic Ar make interp of data difficult. 17460 1 63.9 1.9 biotite conventional K-Ar m80pr-26 "4.962E-04, 0.581E-04, 1.1167E-04" 8.67 8.109 81 Age assignment has no meaning 17460 2 157 hornblende 39Ar-40Ar total fusion m80pr-26 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion "8 heating steps from 650""-1070""c" "Age of m/m fairly sound, some disturbance of hbl is assumed" 17460 3 170.3 5.1 hornblende conventional K-Ar m80pr-26 "4.962E-04, 0.581E-04, 1.1167E-04" 0.385 9.889 72 age of metamorphic crystallization 17461 1 83.4 2.5 muscovite conventional K-Ar m80pr-14 "4.962E-04, 0.581E-04, 1.1167E-04" 9.38 11.524 93 age of metamorphic crystallization 17462 1 179.7 9 hornblende conventional K-Ar m80pr-43 "4.962E-04, 0.581E-04, 1.1167E-04" 0.26 0.706 61 age of metamorphic crystallization 17464 1 188 6 hornblende conventional K-Ar 584 "4.962E-04, 0.581E-04, 1.1167E-04" 1.535 4.378 95 age of intrusion 17465 1 182 6 plagioclase conventional K-Ar 202 "4.962E-04, 0.581E-04, 1.1167E-04" 1.005 2.77 72 age of intrusion 17488 1 55.8 3.6 hornblende conventional K-Ar N.A. "4.962E-04, 0.581E-04, 1.1167E-04" 0.347 0.2823 21 age of metamorphic crystallization 17489 1 54 0.7 hornblende conventional K-Ar N.A. "4.962E-04, 0.581E-04, 1.1167E-04" 0.554 3.633 45 age of metamorphic crystallization 17490 1 28.1 2.7 whole rock conventional K-Ar kk0904855 "4.962E-04, 0.581E-04, 1.1167E-04" 0.344 0.1403 18 age of volcanism Data presented is the avg of two analyses. 17491 1 26.6 2.3 whole rock conventional K-Ar BP0816851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.426 0.164 38 age of volcanism Data presented is the avg of two analyses. 17492 1 27.9 1.9 whole rock conventional K-Ar MM0903851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.603 0.2436 27 age of volcanism Data presented is the avg of two analyses. 17493 1 28.5 1.8 whole rock conventional K-Ar mk8586 "4.962E-04, 0.581E-04, 1.1167E-04" 0.743 0.3068 55 age of volcanism Data presented is the avg of two analyses. 17494 1 16.1 1.8 whole rock conventional K-Ar mk85817 "4.962E-04, 0.581E-04, 1.1167E-04" 0.488 0.1133 16 age of volcanism Data presented is the avg of two analyses. 17495 1 27 1.8 whole rock conventional K-Ar mk85814 "4.962E-04, 0.581E-04, 1.1167E-04" 0.691 0.2702 45 age of volcanism Data presented is the avg of two analyses. 17495 2 Unk conventional K-Ar mk85814 Data presented is the avg of two analyses. 17496 1 22.1 1.3 whole rock conventional K-Ar mk8578 "4.962E-04, 0.581E-04, 1.1167E-04" 1.184 0.6324 60 age of volcanism Data presented is the avg of two analyses. 17497 1 30.1 2.2 whole rock conventional K-Ar mk98415 "4.962E-04, 0.581E-04, 1.1167E-04" 0.476 0.2006 27 age of volcanism Data presented is the avg of two analyses. 17498 1 19.1 1.4 whole rock conventional K-Ar cc1827851 "4.962E-04, 0.581E-04, 1.1167E-04" 4.308 0.2225 51 age of volcanism Data presented is the avg of two analyses. 17499 1 32.7 1.5 whole rock conventional K-Ar tw061985D "4.962E-04, 0.581E-04, 1.1167E-04" 2.564 1.218 66 age of volcanism Data presented is the avg of two analyses. 17500 1 35.5 1.6 whole rock conventional K-Ar cc0712852 "4.962E-04, 0.581E-04, 1.1167E-04" 2.705 1.395 82 age of volcanism Data presented is the avg of two analyses. 17501 1 20.8 1.2 whole rock conventional K-Ar mk8597 "4.962E-04, 0.581E-04, 1.1167E-04" 1.168 0.3522 54 age of volcanism Data presented is the avg of two analyses. 17502 1 37.3 2.2 whole rock conventional K-Ar bp0604851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.657 0.3564 46 age of volcanism Data presented is the avg of two analyses. 17503 1 33.9 1.7 whole rock conventional K-Ar mk8589 "4.962E-04, 0.581E-04, 1.1167E-04" 1.327 0.652 68 age of volcanism Data presented is the avg of two analyses. 17504 1 36.3 2.2 whole rock conventional K-Ar bp0814851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.647 0.342 41 age of volcanism Data presented is the avg of two analyses. 17505 1 32.9 2.6 whole rock conventional K-Ar BP0814856 "4.962E-04, 0.581E-04, 1.1167E-04" 0.38 0.1812 39 age of volcanism Data presented is the avg of two analyses. 17506 1 35.8 1.7 whole rock conventional K-Ar Hs0515852 "4.962E-04, 0.581E-04, 1.1167E-04" 1.958 1.018 64 age of volcanism Data presented is the avg of two analyses. 17507 1 23.2 1.7 whole rock conventional K-Ar HSRH14623 "4.962E-04, 0.581E-04, 1.1167E-04" 0.669 0.225 17 age of volcanism Data presented is the avg of two analyses. 17508 1 2.88 0.05 whole rock conventional K-Ar JA84057 "4.962E-04, 0.581E-04, 1.1167E-04" 0.963 0.3999 67 age of volcanism 17509 1 4.22 0.05 whole rock conventional K-Ar JA84015 "4.962E-04, 0.581E-04, 1.1167E-04" 1.542 0.0937 62 age of volcanism 17510 1 4.06 0.05 whole rock conventional K-Ar JA84017 "4.962E-04, 0.581E-04, 1.1167E-04" 4.266 0.2496 85 age of volcanism 17511 1 34.5 0.5 whole rock conventional K-Ar BPL004842 "4.962E-04, 0.581E-04, 1.1167E-04" 0.243 0.1219 63 age of volcanism 17512 1 20.7 0.3 whole rock conventional K-Ar HS0612851 "4.962E-04, 0.581E-04, 1.1167E-04" 1.193 0.3576 44 age of volcanism 17513 1 19.9 0.4 whole rock conventional K-Ar MK85546 "4.962E-04, 0.581E-04, 1.1167E-04" 0.427 0.1229 48 age of volcanism 17514 1 15.7 0.2 whole rock conventional K-Ar MK85635 "4.962E-04, 0.581E-04, 1.1167E-04" 2.214 0.5014 47 age of volcanism 17515 1 25.5 0.4 whole rock conventional K-Ar MK85627 "4.962E-04, 0.581E-04, 1.1167E-04" 1.088 0.4023 72 age of volcanism 17516 1 4.8 0.1 whole rock conventional K-Ar MK85523 "4.962E-04, 0.581E-04, 1.1167E-04" 0.964 0.0669 62 age of volcanism 17517 1 4.9 0.01 whole rock conventional K-Ar MK8551 "4.962E-04, 0.581E-04, 1.1167E-04" 0.994 0.0708 47 age of volcanism 17518 1 12.9 0.3 whole rock conventional K-Ar MK8555 "4.962E-04, 0.581E-04, 1.1167E-04" 0.648 0.1212 35 age of volcanism 17519 1 35.7 1.6 whole rock conventional K-Ar BP0619851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.989 0.513 94 age of volcanism 17520 1 24.4 1.2 whole rock conventional K-Ar BP0516851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.524 0.1852 58 age of volcanism Data presented is the avg of two analyses. 17521 1 23.6 1.2 whole rock conventional K-Ar MM0904851 "4.962E-04, 0.581E-04, 1.1167E-04" 0.952 0.3258 77 age of volcanism Data presented is the avg of two analyses. 17522 1 38.8 1.9 whole rock conventional K-Ar HS0116853 "4.962E-04, 0.581E-04, 1.1167E-04" 0.597 0.3369 54 age of volcanism Data presented is the avg of two analyses. 17523 1 38.3 1.9 whole rock conventional K-Ar HS0117851A "4.962E-04, 0.581E-04, 1.1167E-04" 1.205 0.6714 78 age of volcanism Data presented is the avg of two analyses. 17524 1 4 0.4 whole rock conventional K-Ar JA85001 "4.962E-04, 0.581E-04, 1.1167E-04" 1.026 0.0589 18 age of volcanism Data presented is the avg of two analyses. 17525 1 4.69 0.17 biotite conventional K-Ar uaka87-89 "4.962E-04, 0.581E-04, 1.1167E-04" 7.455 62 age of volcanism Data from the mean of 4 analyses. 17526 1 10.28 0.28 hornblende conventional K-Ar uaka87-90 "4.962E-04, 0.581E-04, 1.1167E-04" 0.279 69 age of volcanism Data from the mean of 4 analyses. 17527 1 11.12 0.36 plagioclase conventional K-Ar uaka87-91 "4.962E-04, 0.581E-04, 1.1167E-04" 0.245 47 age of volcanism Data from the mean of 5 analyses. 17528 1 4.72 0.28 hornblende conventional K-Ar uaka87-92 "4.962E-04, 0.581E-04, 1.1167E-04" 0.519 80 age of volcanism Data from the mean of 4 analyses. 17529 1 7.41 0.36 hornblende conventional K-Ar uaka87-93 "4.962E-04, 0.581E-04, 1.1167E-04" 0.163 83 age of volcanism Data from the mean of 4 analyses. 17530 1 8.79 0.2 hornblende conventional K-Ar uaka87-94 "4.962E-04, 0.581E-04, 1.1167E-04" 1.025 41 age of volcanism Data from the mean of 4 analyses. 17531 1 10.53 0.37 hornblende conventional K-Ar uaka87-96 "4.962E-04, 0.581E-04, 1.1167E-04" 0.292 69 age of volcanism Data from the mean of 4 analyses. 17532 1 9.25 0.25 hornblende conventional K-Ar uaka87-97 "4.962E-04, 0.581E-04, 1.1167E-04" 0.276 0.0368 60 age of volcanism Data from the mean of 4 analyses. 17533 1 11.28 0.37 hornblende conventional K-Ar uaka87-98 "4.962E-04, 0.581E-04, 1.1167E-04" 0.308 62 age of volcanism Data from the mean of 4 analyses. 17534 1 7.82 0.3 hornblende conventional K-Ar uaka87-197 "4.962E-04, 0.581E-04, 1.1167E-04" 0.307 53 age of volcanism Data from the mean of 3 analyses. 17582 1 494 18 sanidine conventional K-Ar usgs(D)TT64-15 "4.962E-04, 0.581E-04, 1.1167E-04" 9.75 79.7 98 age of volcanism 17583 1 469 11 K feldspar conventional K-Ar usgs(D)TT64-17 "4.962E-04, 0.581E-04, 1.1167E-04" 10.31 79.46 99 age of volcanism 17584 1 501 18 K feldspar conventional K-Ar usgs(D)TT64-3a "4.962E-04, 0.581E-04, 1.1167E-04" 6.51 53.41 98 age of volcanism 17587 1 391 16 biotite conventional K-Ar cc-3 "4.962E-04, 0.581E-04, 1.1167E-04" 6.61 41.52 97 age of intrusion 17588 1 111 4 whole rock conventional K-Ar usgs(D)ccc-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.4 2.309 85 age of volcanism 17589 1 97 4.3 whole rock conventional K-Ar usgs(D)ccc-16 "4.962E-04, 0.581E-04, 1.1167E-04" 0.63 0.8968 83 minimum age of volcanism 17625 1 50.5 0.8 sanidine conventional K-Ar 64-76 "4.962E-04, 0.581E-04, 1.1167E-04" 11.23 8.275 96 age of volcanism 17626 1 38.3 0.6 sanidine conventional K-Ar 71-76 "4.962E-04, 0.581E-04, 1.1167E-04" 12.28 6.833 84 age of volcanism 17627 1 50.5 1.2 sanidine conventional K-Ar 294-79 "4.962E-04, 0.581E-04, 1.1167E-04" 13.87 10.21 60 age of volcanism 17628 1 48.8 1.7 sanidine conventional K-Ar 256-79 "4.962E-04, 0.581E-04, 1.1167E-04" 6.12 4.36 87 age of volcanism 17670 1 145 whole rock conventional K-Ar TR 434A "4.962E-04, 0.581E-04, 1.1167E-04" 17 age of intrusion 17671 1 153 whole rock conventional K-Ar TR 442 "4.962E-04, 0.581E-04, 1.1167E-04" 30 age of intrusion 17672 1 150 whole rock conventional K-Ar TR 437 "4.962E-04, 0.581E-04, 1.1167E-04" 27 age of intrusion 17673 1 146 whole rock conventional K-Ar TR 443 "4.962E-04, 0.581E-04, 1.1167E-04" 37 age of intrusion 17679 1 4.5 0.29 whole rock conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 0.08 86 age of volcanism 17682 1 371 9.4 whole rock 39Ar-40Ar total fusion 75-15 "4.962E-04, 0.581E-04, 1.1167E-04" 95 age of metamorphic crystallization 17683 1 442 11.8 whole rock 39Ar-40Ar total fusion 75-17 "4.962E-04, 0.581E-04, 1.1167E-04" 91 CT140 May reflect inherited Ar ages of detrital muscovite grains. 17684 1 392 10.6 whole rock 39Ar-40Ar total fusion 75-161 "4.962E-04, 0.581E-04, 1.1167E-04" 89 age of metamorphic crystallization 17685 1 440 11.3 whole rock 39Ar-40Ar total fusion 75-124 "4.962E-04, 0.581E-04, 1.1167E-04" 88 CT140 May reflect inherited Ar ages of detrital muscovite grains. 17686 1 387 10.3 whole rock 39Ar-40Ar total fusion 77-1 "4.962E-04, 0.581E-04, 1.1167E-04" 77 age of metamorphic crystallization 17687 1 350 9.7 whole rock 39Ar-40Ar total fusion 77-7 "4.962E-04, 0.581E-04, 1.1167E-04" 94 age of metamorphic crystallization 17688 1 0.05 0.02 whole rock conventional K-Ar 1A "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 0.009 2 age of volcanism 17689 1 0.1 0 whole rock conventional K-Ar 2A "4.962E-04, 0.581E-04, 1.1167E-04" 1.15 0.0016 0 maximum age of volcanism 17689 2 0.1 0.09 whole rock conventional K-Ar 2A "4.962E-04, 0.581E-04, 1.1167E-04" 1.15 0.0017 1 age of volcanism 17690 1 0.2 0.1 whole rock conventional K-Ar 4A "4.962E-04, 0.581E-04, 1.1167E-04" 0.551 0.0015 1 age of volcanism 17690 2 0.4 0.1 whole rock conventional K-Ar 4A "4.962E-04, 0.581E-04, 1.1167E-04" 0.551 0.0032 3 age of volcanism 17691 1 0.07 0 whole rock conventional K-Ar 5B "4.962E-04, 0.581E-04, 1.1167E-04" 1.16 0.0012 0 maximum age of volcanism 17691 2 0.06 0 whole rock conventional K-Ar 5B "4.962E-04, 0.581E-04, 1.1167E-04" 1.16 0.0009 0 maximum age of volcanism 17692 1 0.04 0 whole rock conventional K-Ar 6A "4.962E-04, 0.581E-04, 1.1167E-04" 0.91 0.0004 0 maximum age of volcanism 17693 1 0.14 0 whole rock conventional K-Ar 7A "4.962E-04, 0.581E-04, 1.1167E-04" 0.403 0.0008 0 maximum age of volcanism 17694 1 0.09 0 whole rock conventional K-Ar 8A "4.962E-04, 0.581E-04, 1.1167E-04" 1.01 0.0013 0 maximum age of volcanism 17694 2 0.07 0 whole rock conventional K-Ar 8A "4.962E-04, 0.581E-04, 1.1167E-04" 1.01 0.0006 0 maximum age of volcanism 17695 1 0.83 0.06 whole rock conventional K-Ar 9D "4.962E-04, 0.581E-04, 1.1167E-04" 1.39 0.0166 27 age of volcanism 17696 1 0.13 0.13 whole rock conventional K-Ar 10A "4.962E-04, 0.581E-04, 1.1167E-04" 1.66 0.003 1 age of volcanism 17696 2 20 0.15 whole rock conventional K-Ar 10A "4.962E-04, 0.581E-04, 1.1167E-04" 1.66 0.004 1 age of volcanism 17697 1 3.44 0.22 whole rock conventional K-Ar 12B "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.0511 38 age of volcanism 17698 1 1.05 0.07 whole rock conventional K-Ar 13C "4.962E-04, 0.581E-04, 1.1167E-04" 1.9 0.0288 28 age of volcanism 17699 1 4.23 0.25 whole rock conventional K-Ar 14A "4.962E-04, 0.581E-04, 1.1167E-04" 1.37 0.0835 43 age of volcanism 17700 1 4.79 0.28 whole rock conventional K-Ar 14B "4.962E-04, 0.581E-04, 1.1167E-04" 0.554 0.0383 49 age of volcanism 17701 1 3.45 0.2 whole rock conventional K-Ar 15B "4.962E-04, 0.581E-04, 1.1167E-04" 1.12 0.558 58 age of volcanism 17702 1 0.36 0.04 whole rock conventional K-Ar 16A "4.962E-04, 0.581E-04, 1.1167E-04" 0.966 0.005 9 age of volcanism 17703 1 0.38 0.06 whole rock conventional K-Ar 17A "4.962E-04, 0.581E-04, 1.1167E-04" 0.912 0.0049 6 age of volcanism 17704 1 6.73 0.38 whole rock conventional K-Ar 18B "4.962E-04, 0.581E-04, 1.1167E-04" 1.03 0.1006 60 age of volcanism 17705 1 23 1.2 whole rock conventional K-Ar 20A "4.962E-04, 0.581E-04, 1.1167E-04" 2.22 0.762 81 age of volcanism 17706 1 33.2 1.5 whole rock conventional K-Ar 21A "4.962E-04, 0.581E-04, 1.1167E-04" 4.09 1.974 98 age of volcanism 17730 1 30.2 1 phlogopite conventional K-Ar 77cyp "4.962E-04, 0.581E-04, 1.1167E-04" 8.74 3.83 59 age of volcanism Decay const: =(0.5720*10 to the -10 yr -1) (LB= 4.963*10to the -10 yr-1) 17730 2 2836 0.4 phlogopite 39Ar-40Ar total fusion 77cyp "4.962E-04, 0.581E-04, 1.1167E-04" 67 age of volcanism Decay const: =(0.5720*10 to the -10 yr -1) (LB= 4.963*10to the -10 yr-1) 17730 3 26.5 0.5 rasvumite 39Ar-40Ar total fusion 77cyp "4.962E-04, 0.581E-04, 1.1167E-04" 65 age of volcanism Decay const: =(0.5720*10 to the -10 yr -1) (LB= 4.963*10to the -10 yr-1) 17730 4 29.4 0.5 bartonite 39Ar-40Ar total fusion 77cyp "4.962E-04, 0.581E-04, 1.1167E-04" 77 age of volcanism Decay const: =(0.5720*10 to the -10 yr -1) (LB= 4.963*10to the -10 yr-1) 17731 1 83 biotite conventional K-Ar 9-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 8.5 10.477 91 minimum age of intrusion 17732 1 79.7 biotite conventional K-Ar 3-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 6.8 7.9721 88 age of intrusion 17733 1 81.4 1.8 biotite conventional K-Ar 20-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 6.82 8.1714 83 minimum age of intrusion 17733 2 88.9 2.9 hornblende conventional K-Ar 20-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 2.114 2.7733 74 minimum age of intrusion 17734 1 82.1 2.1 biotite conventional K-Ar 8-133 "4.962E-04, 0.581E-04, 1.1167E-04" 2.28 2.7522 72 minimum age of intrusion 17735 1 81.7 1.8 biotite conventional K-Ar 8-132 "4.962E-04, 0.581E-04, 1.1167E-04" 8.59 10.332 89 minimum age of intrusion 17736 1 76.5 1.9 biotite conventional K-Ar 8-138 "4.962E-04, 0.581E-04, 1.1167E-04" 7.21 8.1112 49 minimum age of intrusion 17736 2 81.6 2.2 hornblende conventional K-Ar 8-138 "4.962E-04, 0.581E-04, 1.1167E-04" 0.814 0.9783 51 minimum age of intrusion 17737 1 81.8 1.9 biotite conventional K-Ar 8-109 "4.962E-04, 0.581E-04, 1.1167E-04" 9.26 11.153 78 minimum age of intrusion 17737 2 92.7 3.1 augite-ferroaugite conventional K-Ar 8-109 "4.962E-04, 0.581E-04, 1.1167E-04" 0.882 1.208 59 minimum age of intrusion 17738 1 83.4 1.8 biotite conventional K-Ar 8-110 "4.962E-04, 0.581E-04, 1.1167E-04" 8.03 9.8653 93 minimum age of intrusion 17739 1 69.5 1.7 biotite conventional K-Ar 27-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 7.36 7.5063 58 minimum age of intrusion Lilely xllization age of 180 Ma. 17739 2 126.9 4.3 hornblende conventional K-Ar 27-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 0.784 1.4578 59 minimum age of intrusion Lilely xllization age of 180 Ma. 17740 1 83.4 3.1 biotite conventional K-Ar 8-127 "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 10.804 85 minimum age of intrusion Lilely xllization age of 105 Ma. 17740 2 84 3.5 hornblende conventional K-Ar 8-127 "4.962E-04, 0.581E-04, 1.1167E-04" 1.053 1.3027 28 minimum age of intrusion Lilely xllization age of 105 Ma. 17741 1 85.7 1.9 biotite conventional K-Ar 8-125b "4.962E-04, 0.581E-04, 1.1167E-04" 9.14 11.541 87 minimum age of intrusion 17742 1 83.1 2 biotite conventional K-Ar Jul-38 "4.962E-04, 0.581E-04, 1.1167E-04" 6.33 7.7501 79 age of intrusion 17743 1 87.9 2 biotite conventional K-Ar Jul-36 "4.962E-04, 0.581E-04, 1.1167E-04" 7.45 9.661 87 minimum age of intrusion 17743 2 78.8 8.3 hornblende conventional K-Ar Jul-36 "4.962E-04, 0.581E-04, 1.1167E-04" 1.06 1.2296 9 minimum age of intrusion 17744 1 77.6 2.1 biotite conventional K-Ar 8-224 "4.962E-04, 0.581E-04, 1.1167E-04" 8.35 9.5326 92 minimum age of intrusion 17745 1 77.2 1.7 biotite conventional K-Ar Jul-45 "4.962E-04, 0.581E-04, 1.1167E-04" 8.01 9.0932 88 minimum age of intrusion Likely xllization age betw 149-123 Ma. 17746 1 72.5 5.4 biotite conventional K-Ar Jul-44 "4.962E-04, 0.581E-04, 1.1167E-04" 7.44 7.9123 69 age of intrusion 17747 1 77.1 2 biotite conventional K-Ar Jul-43 "4.962E-04, 0.581E-04, 1.1167E-04" 2.98 3.3874 65 age of intrusion 17747 2 75.4 2.7 hornblende conventional K-Ar Jul-43 "4.962E-04, 0.581E-04, 1.1167E-04" 0.767 0.8502 47 age of intrusion 17748 1 80.9 1.8 biotite conventional K-Ar 8-231 "4.962E-04, 0.581E-04, 1.1167E-04" 8.98 10.695 88 minimum age of intrusion 17748 2 86 4.9 hornblende conventional K-Ar 8-231 "4.962E-04, 0.581E-04, 1.1167E-04" 2.98 3.7812 18 minimum age of intrusion 17748 3 79.8 1.8 biotite conventional K-Ar 8-232 "4.962E-04, 0.581E-04, 1.1167E-04" 6.53 7.6707 81 minimum age of intrusion Likely xllization age bet 149-123 Ma. 17749 1 79.8 1.8 biotite conventional K-Ar 8-232 "4.962E-04, 0.581E-04, 1.1167E-04" 6.53 7.6707 81 minimum age of intrusion Likely xllization age bet 149-123 Ma. 17749 2 85.7 4.3 hornblende conventional K-Ar 8-232 "4.962E-04, 0.581E-04, 1.1167E-04" 1.41 1.7825 50 minimum age of intrusion Likely xllization age bet 149-123 Ma. 17750 1 73.5 1.4 biotite conventional K-Ar Jul-55 "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 9.4887 68 minimum age of intrusion 17750 2 121.9 0.8 hornblende conventional K-Ar Jul-55 "4.962E-04, 0.581E-04, 1.1167E-04" 1.954 3.548 97 minimum age of intrusion 17751 1 78.4 1.9 biotite conventional K-Ar 6-Sep "4.962E-04, 0.581E-04, 1.1167E-04" 7.78 8.9699 81 minimum age of intrusion 17751 2 94.5 9.8 hornblende conventional K-Ar 6-Sep "4.962E-04, 0.581E-04, 1.1167E-04" 1.07 1.4929 80 minimum age of intrusion 17752 1 89.7 2 biotite conventional K-Ar Aug-73 "4.962E-04, 0.581E-04, 1.1167E-04" 7.6 10.066 82 minimum age of intrusion 17752 2 94 2.5 hornblende conventional K-Ar Aug-73 "4.962E-04, 0.581E-04, 1.1167E-04" 1.276 1.7716 34 minimum age of intrusion 17753 1 75.3 1.8 biotite conventional K-Ar 16-Sep "4.962E-04, 0.581E-04, 1.1167E-04" 7.05 7.8022 59 minimum age of intrusion Likely age of xllization is 160 Ma. 17753 2 102.1 3.6 hornblende conventional K-Ar 16-Sep "4.962E-04, 0.581E-04, 1.1167E-04" 1.555 2.3636 46 minimum age of intrusion Likely age of xllization is 160 Ma. 17754 1 80.3 1.8 biotite conventional K-Ar Aug-27 "4.962E-04, 0.581E-04, 1.1167E-04" 8.2 9.6962 74 minimum age of intrusion 17755 1 85.1 1.9 biotite conventional K-Ar Aug-34 "4.962E-04, 0.581E-04, 1.1167E-04" 7.71 9.6745 80 minimum age of intrusion 17755 2 125.8 4 hornblende conventional K-Ar Aug-34 "4.962E-04, 0.581E-04, 1.1167E-04" 1.038 1.9472 66 minimum age of intrusion 17756 1 81.1 1.7 biotite conventional K-Ar Aug-65 "4.962E-04, 0.581E-04, 1.1167E-04" 9.12 10.885 87 minimum age of intrusion 17762 1 100.6 0.7 biotite conventional K-Ar LE-1104 "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 12.63 65 age of intrusion 17762 2 114.3 0.7 hornblende conventional K-Ar LE-1104 "4.962E-04, 0.581E-04, 1.1167E-04" 0.905 1.537 85 age of intrusion 17765 1 10.2 0.1 whole rock cp-214 "4.962E-04, 0.581E-04, 1.1167E-04" 2.501 0.3695 79 age of volcanism 17767 1 33.9 2.7 hornblende conventional K-Ar d63b "4.962E-04, 0.581E-04, 1.1167E-04" 0.275 0.1354 8 age of volcanism 17768 1 31.1 1.3 hornblende conventional K-Ar d113b "4.962E-04, 0.581E-04, 1.1167E-04" 0.295 0.1331 14 age of volcanism 17769 1 28.8 1.1 hornblende conventional K-Ar 699-15a "4.962E-04, 0.581E-04, 1.1167E-04" 0.305 0.1276 19 age of volcanism 17770 1 26.3 1 biotite conventional K-Ar d27b "4.962E-04, 0.581E-04, 1.1167E-04" 8.23 3.136 49 age of volcanism 17771 1 25.4 1 biotite conventional K-Ar d79b "4.962E-04, 0.581E-04, 1.1167E-04" 7.69 2.828 26 age of volcanism 17772 1 17.3 0.06 biotite conventional K-Ar 1011 "4.962E-04, 0.581E-04, 1.1167E-04" 8.72 2.187 45 age of volcanism 17773 1 15.8 0.5 whole rock conventional K-Ar d302b "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 0.2732 19 age of volcanism 17774 1 15.7 0.5 whole rock conventional K-Ar d144b "4.962E-04, 0.581E-04, 1.1167E-04" 0.54 0.1206 26 age of volcanism 17775 1 15.7 0.4 whole rock conventional K-Ar d474b "4.962E-04, 0.581E-04, 1.1167E-04" 1.2 0.2732 19 age of volcanism 17776 1 14.1 0.4 whole rock conventional K-Ar d418b "4.962E-04, 0.581E-04, 1.1167E-04" 0.474 0.0969 39 age of volcanism 17777 1 15.5 0.5 biotite conventional K-Ar d53b "4.962E-04, 0.581E-04, 1.1167E-04" 8.16 1.828 37 age of volcanism 17778 1 15.9 0.5 biotite conventional K-Ar d54b "4.962E-04, 0.581E-04, 1.1167E-04" 7.95 1.829 53 age of volcanism 17779 1 16 0.5 biotite conventional K-Ar bt-1 "4.962E-04, 0.581E-04, 1.1167E-04" 7.78 1.795 68 age of volcanism 17780 1 14.5 0.4 biotite conventional K-Ar d398b "4.962E-04, 0.581E-04, 1.1167E-04" 7.21 1.506 46 age of volcanism 17781 1 14.1 0.4 whole rock conventional K-Ar d235b "4.962E-04, 0.581E-04, 1.1167E-04" 1.49 0.3036 75 age of volcanism 17782 1 14 0.4 whole rock conventional K-Ar d173b "4.962E-04, 0.581E-04, 1.1167E-04" 0.759 0.1535 40 age of volcanism 17783 1 7.3 0.3 whole rock conventional K-Ar bc-1 "4.962E-04, 0.581E-04, 1.1167E-04" 4.7 0.4949 29 age of volcanism 17784 1 7.9 0.2 whole rock conventional K-Ar sh-1 "4.962E-04, 0.581E-04, 1.1167E-04" 4.91 0.5589 85 age of volcanism 17785 1 9.2 0.3 whole rock conventional K-Ar oh-1 "4.962E-04, 0.581E-04, 1.1167E-04" 4.89 0.6498 82 age of volcanism 17786 1 26.6 1.1 hornblende conventional K-Ar 433 "4.962E-04, 0.581E-04, 1.1167E-04" 0.44 0.1695 22 age of volcanism 17787 1 28.7 1.1 hornblende conventional K-Ar 966-15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.56 0.2335 25 age of volcanism 17788 1 1300 20 biotite 39Ar-40Ar incremental (plateau) fd-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17788 2 928 6 K feldspar 39Ar-40Ar incremental (plateau) fd-1 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17789 1 140 20 biotite 39Ar-40Ar incremental (plateau) sm1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism 17789 2 185 K feldspar 39Ar-40Ar incremental (plateau) sm1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism 17790 1 132 1 biotite 39Ar-40Ar incremental (plateau) sm5 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17791 1 175 hornblende 39Ar-40Ar incremental (plateau) clm2 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17791 2 132 9 biotite 39Ar-40Ar incremental (plateau) clm2 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17791 3 K feldspar 39Ar-40Ar incremental (plateau) clm2 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age range from 73-125 Ma 17792 1 K feldspar 39Ar-40Ar incremental (plateau) clmp1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age range from 80-160 Ma 17792 2 87 1 biotite 39Ar-40Ar incremental (plateau) clmp1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17793 1 hornblende 39Ar-40Ar incremental (plateau) tmjk5 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion Age between 1200-1400 Ma 17793 2 K feldspar 39Ar-40Ar incremental (plateau) tmjk5 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age gradient from 160 to 630 Ma 17793 3 172 3 biotite 39Ar-40Ar incremental (plateau) tmjk5 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17794 1 K feldspar 39Ar-40Ar incremental (plateau) tmjw1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age gradient from 92-220 Ma 17794 2 124 1 biotite 39Ar-40Ar incremental (plateau) tmjw1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17795 1 73 1 biotite 39Ar-40Ar incremental (plateau) stl1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17795 2 K feldspar 39Ar-40Ar incremental (plateau) stl1 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion Age gradient from 57-73 Ma 17796 1 18 1 K feldspar 39Ar-40Ar incremental (plateau) scm-11 "4.962E-04, 0.581E-04, 1.1167E-04" CT140 Minimum age of mylonitization. 17796 2 20 0.3 biotite 39Ar-40Ar incremental (plateau) scm-11 "4.962E-04, 0.581E-04, 1.1167E-04" CT140 Onset of mylonitization. 17797 1 88 4 hornblende 39Ar-40Ar incremental (plateau) scm-10 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion CT140 Onset of mylonitization. 17798 1 22 2 hornblende 39Ar-40Ar incremental (plateau) scm-16 "4.962E-04, 0.581E-04, 1.1167E-04" Age of mylonitization. 17798 2 16.8 0.6 biotite 39Ar-40Ar incremental (plateau) scm-16 "4.962E-04, 0.581E-04, 1.1167E-04" Age of mylonitization. 17798 3 K feldspar 39Ar-40Ar incremental (plateau) scm-16 "4.962E-04, 0.581E-04, 1.1167E-04" Mylonitization age gradient of 14-20 Ma 17799 1 23.5 0.9 hornblende 39Ar-40Ar incremental (plateau) scm-17 "4.962E-04, 0.581E-04, 1.1167E-04" Age of mylonitization. 17800 1 23.3 1.7 hornblende 39Ar-40Ar incremental (plateau) scm-20 "4.962E-04, 0.581E-04, 1.1167E-04" Age of mylonitization. 17800 2 K feldspar 39Ar-40Ar incremental (plateau) scm-20 "4.962E-04, 0.581E-04, 1.1167E-04" Min age of mylonitization betw 17-18 Ma 17801 1 80 2 hornblende 39Ar-40Ar incremental (plateau) chm-26 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17802 1 65 4 hornblende 39Ar-40Ar incremental (plateau) chm-21 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17803 1 hornblende 39Ar-40Ar incremental (plateau) chm-6 "4.962E-04, 0.581E-04, 1.1167E-04" Age gradient from 30 to 40 Ma. Gradient due to either cooling during the Tertiary or partial 40Ar loss younger than 30 Ma. 17804 1 18.1 0.6 biotite 39Ar-40Ar incremental (plateau) chm-22 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17804 2 31 2 hornblende 39Ar-40Ar incremental (plateau) chm-22 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17805 1 18.5 0.6 biotite 39Ar-40Ar incremental (plateau) chm-24 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17805 2 24 2 hornblende 39Ar-40Ar incremental (plateau) chm-24 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17806 1 17.6 0.5 biotite 39Ar-40Ar incremental (plateau) chm-7 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17806 2 23 2 hornblende 39Ar-40Ar incremental (plateau) chm-7 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17807 1 18.4 0.7 biotite 39Ar-40Ar incremental (plateau) chm-5 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17807 2 22 2 hornblende 39Ar-40Ar incremental (plateau) chm-5 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17808 1 16 2 K feldspar 39Ar-40Ar incremental (plateau) chm-9 "4.962E-04, 0.581E-04, 1.1167E-04" This is a min age due to excess Ar in their diffusion domains. 17808 2 24.2 1 biotite 39Ar-40Ar incremental (plateau) chm-9 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17808 3 hornblende 39Ar-40Ar incremental (plateau) chm-9 "4.962E-04, 0.581E-04, 1.1167E-04" Age between 65-110 Ma. Sample closed to Argon loss during the Cretaceous. 17809 1 hornblende 39Ar-40Ar incremental (plateau) chm-2 "4.962E-04, 0.581E-04, 1.1167E-04" Age betw 27-104 Ma Sample closed to Argon loss during the Cretaceous. 17810 1 K feldspar 39Ar-40Ar incremental (plateau) chm-8 "4.962E-04, 0.581E-04, 1.1167E-04" Age gradient between 16-20 Ma. Min age due to excess Ar in their large diffusion domains. 17810 2 45 hornblende 39Ar-40Ar incremental (plateau) chm-8 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17811 1 52 1 K feldspar 39Ar-40Ar incremental (plateau) chm-10 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17811 2 66.5 0.4 biotite 39Ar-40Ar incremental (plateau) chm-10 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17812 1 K feldspar 39Ar-40Ar incremental (plateau) 81-142 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age gradient betw 20-49 Ma. 17812 2 57.8 1.4 biotite 39Ar-40Ar incremental (plateau) 81-142 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 17813 1 21 K feldspar 39Ar-40Ar incremental (plateau) chm1 "4.962E-04, 0.581E-04, 1.1167E-04" "This is a min age, due to excess Ar in their large diffusion domains." 17813 2 36.5 0.8 biotite 39Ar-40Ar incremental (plateau) chm1 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17814 1 24.6 0.4 K feldspar 39Ar-40Ar incremental (plateau) 81-140 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17814 2 19.5 0.7 biotite 39Ar-40Ar incremental (plateau) 81-140 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17815 1 16 2 K feldspar 39Ar-40Ar incremental (plateau) chm3 "4.962E-04, 0.581E-04, 1.1167E-04" This is a min age due to excess Ar in their large diffusion domains. 17815 2 17 0.2 biotite 39Ar-40Ar incremental (plateau) chm3 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17816 1 K feldspar 39Ar-40Ar incremental (plateau) chp "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age gradient from 17-38 Ma. 17817 1 K feldspar 39Ar-40Ar incremental (plateau) chm-27 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age gradient from 17-22 Ma. 17818 1 K feldspar 39Ar-40Ar incremental (plateau) mh155 "4.962E-04, 0.581E-04, 1.1167E-04" Disturbed age spectra w/min ages of 82-120 Ma. Due to partial outgassing of Kf. 17818 2 1290 40 hornblende 39Ar-40Ar incremental (plateau) mh155 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization 17818 3 581 31 biotite 39Ar-40Ar incremental (plateau) mh155 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17819 1 1050 hornblende 39Ar-40Ar incremental (plateau) mh29 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization 17820 1 K feldspar 39Ar-40Ar incremental (plateau) mh9 "4.962E-04, 0.581E-04, 1.1167E-04" Disturbed age spectra w/min ages of 82-120 Ma. Due to partial outgassing of Kf. 17820 2 1210 hornblende 39Ar-40Ar incremental (plateau) mh9 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization . 17821 1 hornblende 39Ar-40Ar incremental (plateau) mh67 "4.962E-04, 0.581E-04, 1.1167E-04" "Age gradient from 70-140 Ma, age may be result of cooling after early cretaceous heating." 17822 1 581 31 biotite 39Ar-40Ar incremental (plateau) mh10 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17822 2 K feldspar 39Ar-40Ar incremental (plateau) mh10 "4.962E-04, 0.581E-04, 1.1167E-04" Disturbed age spectra w/min ages of 82-120 Ma. Due to partial outgassing of Kf. 17823 1 62.3 1.5 biotite 39Ar-40Ar incremental (plateau) mh6 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17824 1 59 4 K feldspar 39Ar-40Ar incremental (plateau) mh16 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17824 2 59 4 biotite 39Ar-40Ar incremental (plateau) mh16 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17825 1 K feldspar 39Ar-40Ar incremental (plateau) mh310 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age range betw 18-22 Ma. 17825 2 21.5 0.4 biotite 39Ar-40Ar incremental (plateau) mh310 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17826 1 28 K feldspar 39Ar-40Ar incremental (plateau) mh20 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17827 1 K feldspar 39Ar-40Ar incremental (plateau) mh154 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion Age range between 50-75 Ma. 17828 1 312 5 biotite 39Ar-40Ar incremental (plateau) bk7a "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion 17829 1 K feldspar 39Ar-40Ar incremental (plateau) bw25 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of intrusion Age gradient from 70 to >200 Ma. 17830 1 K feldspar 39Ar-40Ar incremental (plateau) kh78-100 "4.962E-04, 0.581E-04, 1.1167E-04" "Plateau age of 130 +- 3 Ma, follow by an age gradient to 1350 Ma." 17832 1 34 glass conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17833 1 10 glass conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17834 1 44 33 glass conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17835 1 57 23 glass conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17836 1 101 33 glass conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17837 1 88 28 glass conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17837 2 100 glass conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17839 1 100 glass conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17840 1 72 31 glass conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17841 1 300 glass conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17842 1 90 7 glass conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17843 1 244 30 glass conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17844 1 78 1 glass conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17845 1 77 10 glass conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17846 1 117 8 glass conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17847 1 144 19 glass conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17848 1 179 3 glass conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17849 1 148 5 glass conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17850 1 399 4 glass conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17851 1 102 11 glass conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17852 1 770 glass conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17853 1 730 glass conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17854 1 580 glass conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17855 1 490 glass conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "Age reported is-x10 to the 3 yrs, not m.y." 17856 1 74.2 1.2 hornblende conventional K-Ar 39-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.085 1.1827 69 CT140 Age of thermal event. 17856 2 74.9 2.2 hornblende conventional K-Ar 39-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.209 1.332 85 CT140 Age of thermal event. 17856 3 69.7 2.1 biotite conventional K-Ar 39-3 "4.962E-04, 0.581E-04, 1.1167E-04" 9.16 9.369 95 CT140 Age of thermal event. 17857 1 72.7 1.3 hornblende conventional K-Ar 37-1 LM "4.962E-04, 0.581E-04, 1.1167E-04" 0.94 0.9759 71 CT140 Age of thermal event. 17857 2 71 1.2 biotite conventional K-Ar 37-1 LM "4.962E-04, 0.581E-04, 1.1167E-04" 7.55 7.8469 73 CT140 Age of thermal event. 17857 3 68 4 feldspar conventional K-Ar 37-1 LM "4.962E-04, 0.581E-04, 1.1167E-04" 13.41 13.3696 42 CT140 Age of thermal event. 17863 1 19.2 0.6 sanidine conventional K-Ar Bristol "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17863 2 20.1 0.5 biotite conventional K-Ar Bristol "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17863 3 16.5 0.4 sanidine conventional K-Ar Bristol "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17863 4 18 0.5 sanidine conventional K-Ar Bristol "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17864 1 16.2 0.4 sanidine conventional K-Ar Marble "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17865 1 18.6 0.6 sanidine conventional K-Ar Piute "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17866 1 17.5 0.4 sanidine conventional K-Ar Ship "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17867 1 19.8 plagioclase conventional K-Ar 6-Aug "4.962E-04, 0.581E-04, 1.1167E-04" 1.135 0.3257 64 age of volcanism 17868 1 19.9 whole rock conventional K-Ar 2-Dec "4.962E-04, 0.581E-04, 1.1167E-04" 1.585 0.4562 64 age of volcanism 17869 1 20.2 whole rock conventional K-Ar ag-3 "4.962E-04, 0.581E-04, 1.1167E-04" 3.475 1.0145 69 age of volcanism 17870 1 20 sanidine conventional K-Ar 11-1a "4.962E-04, 0.581E-04, 1.1167E-04" 6.425 1.862 56 age of volcanism 17871 1 3.2 0.1 whole rock conventional K-Ar bad-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.55 0.0705 14 age of volcanism 17872 1 2.9 0.2 whole rock conventional K-Ar Bad-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.46 0.0605 12 age of volcanism 17873 1 3.3 0.2 whole rock conventional K-Ar Bad-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.846 0.0397 11 age of volcanism 17874 1 4.3 0.7 whole rock conventional K-Ar Tad-3 "4.962E-04, 0.581E-04, 1.1167E-04" 0.228 0.014 4 age of volcanism 17875 1 7.4 0.3 whole rock conventional K-Ar Tad-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.635 0.0678 16 age of volcanism 17876 1 6.4 0.4 whole rock conventional K-Ar Tad-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.888 0.1737 11 age of volcanism 17877 1 6.9 0.6 whole rock conventional K-Ar Tad-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.53 0.1518 6 age of volcanism 17878 1 2.1 0.3 whole rock conventional K-Ar Tad-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.459 0.0448 4 age of volcanism 17879 1 2.8 0.5 whole rock conventional K-Ar Bad-4 "4.962E-04, 0.581E-04, 1.1167E-04" 2.143 0.0867 7 age of volcanism 17880 1 4.1 0.2 whole rock conventional K-Ar Bad-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.197 0.0707 20 age of volcanism 17881 1 3 0.5 whole rock conventional K-Ar Gad-8 "4.962E-04, 0.581E-04, 1.1167E-04" 0.189 0.008 2 age of volcanism 17882 1 3.8 0.3 whole rock conventional K-Ar Gad-7 "4.962E-04, 0.581E-04, 1.1167E-04" 3.05 0.1655 7 age of volcanism 17883 1 0.17 0.07 whole rock conventional K-Ar yad-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.712 0.0042 1 age of volcanism 17884 1 3.1 0.1 whole rock conventional K-Ar yad-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.344 0.1043 29 age of volcanism 17885 1 2.5 0.2 whole rock conventional K-Ar yad-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.117 0.04 7 age of volcanism 17886 1 4.6 0.2 whole rock conventional K-Ar yad-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.906 0.0597 32 age of volcanism 17887 1 2.3 0.1 whole rock conventional K-Ar gad-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.83 0.0597 27 age of volcanism 17888 1 1.8 0.5 whole rock conventional K-Ar gad-4 "4.962E-04, 0.581E-04, 1.1167E-04" 1.151 0.0296 3 age of volcanism 17889 1 3.4 0.2 whole rock conventional K-Ar gad-9 "4.962E-04, 0.581E-04, 1.1167E-04" 1.645 0.0811 19 age of volcanism 17890 1 3.9 0.2 whole rock conventional K-Ar gad-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.615 0.0915 38 age of volcanism 17891 1 11.4 0.3 whole rock conventional K-Ar gad-5 "4.962E-04, 0.581E-04, 1.1167E-04" 2.209 0.3624 82 age of volcanism 17892 1 1.3 0.3 whole rock conventional K-Ar gad-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.291 0.0055 1 age of volcanism 17893 1 10.4 0.4 whole rock conventional K-Ar RAD-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.237 0.1859 27 age of volcanism 17894 1 4.9 0.5 whole rock conventional K-Ar RAD-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.391 0.0273 6 age of volcanism 17895 1 10.9 0.4 whole rock conventional K-Ar GAD-10 "4.962E-04, 0.581E-04, 1.1167E-04" 2.155 0.3403 35 age of volcanism 17896 1 10 0.4 whole rock conventional K-Ar GAD-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.789 0.2575 35 age of volcanism 17897 1 11.8 0.6 whole rock conventional K-Ar GAD-11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.954 0.3321 27 age of volcanism 17898 1 10.1 0.6 whole rock conventional K-Ar GAD-6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.542 0.0792 18 age of volcanism 17899 1 16.3 6 whole rock conventional K-Ar RAD-3 "4.962E-04, 0.581E-04, 1.1167E-04" 1.448 0.342 47 age of volcanism 17922 1 0.74 0.01 sanidine conventional K-Ar 79g145 "4.962E-04, 0.581E-04, 1.1167E-04" 10.07 0.1074 73 age of volcanism 17923 1 0.75 0.02 sanidine conventional K-Ar 79g145-2 "4.962E-04, 0.581E-04, 1.1167E-04" 10.01 0.1082 54 age of volcanism 17924 1 0.74 0.01 sanidine conventional K-Ar 80g24 "4.962E-04, 0.581E-04, 1.1167E-04" 10.82 0.1154 45 age of volcanism 17925 1 0.71 0.01 sanidine conventional K-Ar 80g245 "4.962E-04, 0.581E-04, 1.1167E-04" 10.93 0.1123 38 age of volcanism 17926 1 0.73 0.01 sanidine conventional K-Ar 80g21 "4.962E-04, 0.581E-04, 1.1167E-04" 11.02 0.1165 40 age of volcanism 17927 1 0.76 0.03 sanidine conventional K-Ar 64g001 "4.962E-04, 0.581E-04, 1.1167E-04" 10.63 0.118 62 age of volcanism 17928 1 0.73 0.03 sanidine conventional K-Ar 64g002 "4.962E-04, 0.581E-04, 1.1167E-04" 10.69 0.1154 56 age of volcanism 17929 1 0.75 0.01 sanidine conventional K-Ar b-105 "4.962E-04, 0.581E-04, 1.1167E-04" 9.87 0.1033 61 age of volcanism 17930 1 0.74 0.01 sanidine conventional K-Ar b-109 "4.962E-04, 0.581E-04, 1.1167E-04" 10.4 0.1078 43 age of volcanism 17931 1 1.14 0.6 biotite conventional K-Ar 79g14b "4.962E-04, 0.581E-04, 1.1167E-04" 6.92 0.1135 2 age of volcanism 17932 1 1.36 0.13 plagioclase conventional K-Ar 79g14pq "4.962E-04, 0.581E-04, 1.1167E-04" 0.9 0.1754 11 maximum age of volcanism Plag and qtz. 17933 1 0.66 0.04 plagioclase conventional K-Ar 80g21p "4.962E-04, 0.581E-04, 1.1167E-04" 0.83 0.0801 7 age of volcanism 17934 1 0.71 0.01 sanidine conventional K-Ar 79g885 "4.962E-04, 0.581E-04, 1.1167E-04" 10.97 0.1124 66 age of volcanism 17935 1 0.76 0.02 sanidine conventional K-Ar 79g885-1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.96 0.1205 60 age of volcanism 17936 1 0.74 0.01 sanidine conventional K-Ar 79g885-2 "4.962E-04, 0.581E-04, 1.1167E-04" 10.96 0.1173 50 age of volcanism 17937 1 0.75 0.01 sanidine conventional K-Ar 79g945 "4.962E-04, 0.581E-04, 1.1167E-04" 11.24 0.1216 53 age of volcanism 17938 1 0.69 0.03 sanidine conventional K-Ar 64g003 "4.962E-04, 0.581E-04, 1.1167E-04" 10.94 0.116 42 age of volcanism 17939 1 0.7 0.01 sanidine conventional K-Ar b-96 "4.962E-04, 0.581E-04, 1.1167E-04" 9.09 0.0886 77 age of volcanism 17940 1 0.74 0.54 plagioclase conventional K-Ar 79g88p "4.962E-04, 0.581E-04, 1.1167E-04" 1.309 0.0139 10 age of volcanism 17941 1 0.93 0.31 glass conventional K-Ar 77g88g "4.962E-04, 0.581E-04, 1.1167E-04" 5.09 0.0679 2 age of volcanism 17942 1 1.1 0.52 biotite conventional K-Ar 77g88b "4.962E-04, 0.581E-04, 1.1167E-04" 6.5 0.1243 2 age of volcanism 17943 1 0.34 0.25 biotite conventional K-Ar 77g88b "4.962E-04, 0.581E-04, 1.1167E-04" 6.28 0.0311 1 age of volcanism 17944 1 0.83 0.1 plagioclase conventional K-Ar 77g94p "4.962E-04, 0.581E-04, 1.1167E-04" 1.16 0.1408 4 age of volcanism 17945 1 0.84 0.07 sanidine conventional K-Ar s41 "4.962E-04, 0.581E-04, 1.1167E-04" 8.676 0.1054 71 age of volcanism (CT131 68-00049) Age modified using 77 decay constants. 17946 1 0.71 0.01 sanidine conventional K-Ar s41 "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 0.081 42 age of volcanism (CT131 68-00049) Age modified using 77 decay constants. 17947 1 0.73 0.02 sanidine conventional K-Ar s40 "4.962E-04, 0.581E-04, 1.1167E-04" 8.471 0.0866 80 age of volcanism (CT131 68-00049) Age modified using 77 decay constants. 17948 1 0.74 0.01 sanidine conventional K-Ar s39 "4.962E-04, 0.581E-04, 1.1167E-04" 8.555 0.0913 53 age of volcanism (CT131 68-00049) Age modified using 77 decay constants. 17949 1 73.7 3.6 hornblende 40Ar/36Ar-39Ar/36Ar isochron ra82 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17950 1 72.8 0.2 muscovite 40Ar/36Ar-39Ar/36Ar isochron ra83 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17951 1 71.7 0.3 muscovite 40Ar/36Ar-39Ar/36Ar isochron ra100 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17952 1 55.3 0.4 muscovite 40Ar/36Ar-39Ar/36Ar isochron ef503 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17953 1 60.8 0.6 muscovite 40Ar/36Ar-39Ar/36Ar isochron ef463 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17954 1 58.9 2.5 hornblende 40Ar/36Ar-39Ar/36Ar isochron ef5 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17955 1 60.3 2.6 hornblende 40Ar/36Ar-39Ar/36Ar isochron ef4 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17956 1 73.4 3 hornblende 40Ar/36Ar-39Ar/36Ar isochron ef23a "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17957 1 58.1 0.8 muscovite 40Ar/36Ar-39Ar/36Ar isochron ef421 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17958 1 55.9 0.2 muscovite 40Ar/36Ar-39Ar/36Ar isochron ef525 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17959 1 55.3 2.4 hornblende 40Ar/36Ar-39Ar/36Ar isochron br224 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17960 1 84.6 2.2 hornblende 40Ar/36Ar-39Ar/36Ar isochron pr19 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17961 1 74.6 0.3 hornblende 40Ar/36Ar-39Ar/36Ar isochron or235a "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17962 1 52.1 0.4 muscovite 40Ar/36Ar-39Ar/36Ar isochron or230b "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17963 1 40.6 0.9 muscovite 40Ar/36Ar-39Ar/36Ar isochron or178m "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17964 1 47.7 2 hornblende 40Ar/36Ar-39Ar/36Ar isochron ug812 "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17965 1 49.7 0.2 muscovite 40Ar/36Ar-39Ar/36Ar isochron ug805 "4.962E-04, 0.581E-04, 1.1167E-04" age of metamorphic crystallization "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17965 2 38.5 1.2 biotite 40Ar/36Ar-39Ar/36Ar isochron ug805b "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism "The author gave plateau ages for each sample, however, the plateaus were irregular generally due to exess radiogenic argon. For this reason, ages cited in NGDB are the isochron derived ages." 17972 1 11.7 0.7 whole rock conventional K-Ar 742-45 "4.962E-04, 0.581E-04, 1.1167E-04" 1.243 0.2104 62 age of volcanism 17973 1 10 2 whole rock conventional K-Ar Dike 4 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 17986 1 108 3 muscovite conventional K-Ar fd-64 "4.962E-04, 0.581E-04, 1.1167E-04" 5.32 8.484 88 age of intrusion Variety of mica called mariposite. 17987 1 116 3 muscovite conventional K-Ar fd-55 "4.962E-04, 0.581E-04, 1.1167E-04" 7.71 13.28 92 age of intrusion Variety of mica called mariposite. 17988 1 116 3 muscovite conventional K-Ar fd-65 "4.962E-04, 0.581E-04, 1.1167E-04" 8.79 15.2 93 age of intrusion Variety of mica called mariposite. 17989 1 127 4 muscovite conventional K-Ar fd-66 "4.962E-04, 0.581E-04, 1.1167E-04" 9.87 18.7 77 age of intrusion Variety of mica called mariposite. 17990 1 182 10 hornblende conventional K-Ar wa-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.22 0.72 30 minimum age of intrusion 17991 1 286 12 hornblende conventional K-Ar wa-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 1.613 63 minimum age of metamorphic crystallization 17992 1 273 11 hornblende conventional K-Ar a-1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.33 1.44 81 minimum age of metamorphic crystallization 17993 1 280 10 hornblende conventional K-Ar a-2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.39 1.706 87 minimum age of metamorphic crystallization 17994 1 309 12 hornblende conventional K-Ar a-3 "4.962E-04, 0.581E-04, 1.1167E-04" 7.1 35.17 95 minimum age of metamorphic crystallization 17995 1 329 13 muscovite conventional K-Ar a-4 "4.962E-04, 0.581E-04, 1.1167E-04" 7.2 38.41 93 minimum age of metamorphic crystallization 17996 1 135 5 biotite conventional K-Ar wa-5 "4.962E-04, 0.581E-04, 1.1167E-04" 1.6 3.44 82 0 CT120 17997 1 132 5 biotite conventional K-Ar a-5 "4.962E-04, 0.581E-04, 1.1167E-04" 8.4 17.12 96 age of intrusion CT120 17997 2 128 5 hornblende conventional K-Ar a-5 "4.962E-04, 0.581E-04, 1.1167E-04" 0.47 0.917 69 age of intrusion CT120 17998 1 0.48 0.11 plagioclase conventional K-Ar c84-40 "4.962E-04, 0.581E-04, 1.1167E-04" 2.116 age of volcanism 17999 1 0.23 0.08 plagioclase conventional K-Ar c84-41 "4.962E-04, 0.581E-04, 1.1167E-04" 2.352 age of volcanism 18000 1 0.28 0.3 plagioclase conventional K-Ar sg-1c "4.962E-04, 0.581E-04, 1.1167E-04" 0.916 age of volcanism 18001 1 19.31 0.02 biotite 39Ar-40Ar total fusion 87cs-brb8 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism Biotite % 40Ar ranges from 80.5-87.9. Age given to 1c for avg of 3 analyses. 18002 1 17.72 1.4 biotite 39Ar-40Ar total fusion 86cs-rb7 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism % 40Ar ranges from 14.7-29.3. Age given to 1c for avg of 11 analyses. 18002 2 16.3 0.6 biotite 39Ar-40Ar total fusion 86cs-brb7 "4.962E-04, 0.581E-04, 1.1167E-04" 6.37 age of volcanism 40Ar (rad) ranges from 1.458-1.514 E-10 moles/g and % 40Ar ranges from 80.5-87.9 (3 analyses). 18003 1 15.8 0.4 sanidine conventional K-Ar 86cs-bcc1 "4.962E-04, 0.581E-04, 1.1167E-04" 10.3 age of volcanism 40Ar (rad) ranges from 2.313-2.374 E-10 moles/g and % 40Ar ranges from 63.8-69.0 (3 analyses). 18003 2 14.6 biotite conventional K-Ar 86cs-bcc1 "4.962E-04, 0.581E-04, 1.1167E-04*" 8.35 age meaning uncertain (geologic factors) 40Ar (rad) ranges from 1.743-1.774 E-10 moles/g and % 40Ar ranges from 61.4-68.1 (2 analyses). No age given; author notes ages anomalously young. 18004 1 15.5 0.08 biotite conventional K-Ar cs8307 "4.962E-04, 0.581E-04, 1.1167E-04" 8.78 age of volcanism 40Ar (rad) ranges from 1.948-1.970. E-10 moles/g and % 40Ar ranges from 78.0-85.7 (2 analyses). 18005 1 14.8 0.15 biotite conventional K-Ar rht1348 "4.962E-04, 0.581E-04, 1.1167E-04" 7.15 age of volcanism 40Ar (rad) ranges from 3*3478.-3*4354. E-10 moles/g and % 40Ar ranges from 65.0-71.0 (2 analyses). 18006 1 14.8 0.1 biotite conventional K-Ar None "4.962E-04, 0.581E-04, 1.1167E-04" 7.99 1.7 74 age of volcanism 40Ar (rad) ranges from . E-10 moles/g and % 40Ar ranges from (2 analyses). 18007 1 14.81 0.06 biotite 39Ar-40Ar total fusion ka449 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 40Ar (rad) ranges from . E-10 moles/g and % 40Ar ranges from 57.6-93.5 (6 analyses). 18008 1 14 0.09 biotite 39Ar-40Ar total fusion cs-8309 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism 40Ar (rad) ranges from . E-10 moles/g and % 40Ar ranges from 52.2-60.0 (4 analyses). 18008 2 14 0.1 biotite conventional K-Ar cs-8309 "4.962E-04, 0.581E-04, 1.1167E-04" 7.97 age of volcanism 40Ar (rad) ranges from 1.610-1.620. E-10 moles/g and % 40Ar ranges from 58.9-59.7 (2 analyses). 18009 1 biotite conventional K-Ar rht1343 "4.962E-04, 0.581E-04, 1.1167E-04" 7.13 age meaning uncertain (geologic factors) 40Ar (rad) ranges from 2*9075.-3*2152. E-10 moles/g and % 40Ar ranges from 29.0-43.0 (2 analyses). 18010 1 13.4 0.2 biotite conventional K-Ar des7017 "4.962E-04, 0.581E-04, 1.1167E-04" 7.2 age of volcanism 40Ar (rad) ranges from 1.378-1.409. E-10 moles/g and % 40Ar ranges from 38.0-38.3 (2 analyses). 18010 2 13.4 0.2 sanidine conventional K-Ar des7017 "4.962E-04, 0.581E-04, 1.1167E-04" 0.413 age of volcanism 40Ar (rad) ranges from .08008-.08086. E-10 moles/g and % 40Ar ranges from 19.6-29.7 (2 analyses). 18011 1 6.17 0.13 whole rock conventional K-Ar km86-34 "4.962E-04, 0.581E-04, 1.1167E-04" 0.742 0.6599 33 age of volcanism 18012 1 5.67 0.17 whole rock conventional K-Ar km86-51 "4.962E-04, 0.581E-04, 1.1167E-04" 0.386 0.0315 39 age of volcanism 18013 1 2.77 0.16 whole rock conventional K-Ar km86-56 "4.962E-04, 0.581E-04, 1.1167E-04" 0.208 0.0077 19 age of volcanism 18013 2 2.65 0.13 whole rock conventional K-Ar km86-56 "4.962E-04, 0.581E-04, 1.1167E-04" 0.208 0.0079 19 age of volcanism 18014 1 5.69 0.3 whole rock conventional K-Ar km86-72 "4.962E-04, 0.581E-04, 1.1167E-04" 0.2 0.0164 25 age of volcanism 18015 1 2 0.04 whole rock conventional K-Ar km86-78 "4.962E-04, 0.581E-04, 1.1167E-04" 1.267 0.0366 24 age of volcanism 18016 1 2.73 0.06 whole rock conventional K-Ar km86-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.374 0.0543 22 age of volcanism 18017 1 7.32 0.24 whole rock conventional K-Ar km86-96 "4.962E-04, 0.581E-04, 1.1167E-04" 2.282 0.241 41 age of volcanism 18018 1 3.24 0.05 whole rock conventional K-Ar km87-11 "4.962E-04, 0.581E-04, 1.1167E-04" 1.412 0.0658 21 age of volcanism 18019 1 5.33 0.1 whole rock conventional K-Ar km87-50 "4.962E-04, 0.581E-04, 1.1167E-04" 0.627 0.0482 38 age of volcanism 18020 1 10.96 0.18 whole rock conventional K-Ar km87-53 "4.962E-04, 0.581E-04, 1.1167E-04" 0.628 0.0993 58 age of volcanism 18021 1 4.98 0.22 whole rock conventional K-Ar km87-128 "4.962E-04, 0.581E-04, 1.1167E-04" 0.237 0.017 27 age of volcanism 18032 1 21.04 0.3 sanidine 39Ar-40Ar incremental (plateau) m80-br "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 9 heating steps from 825'c to 1180'c. 18032 2 19.81 0.44 biotite 39Ar-40Ar incremental (plateau) m80-br "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 10 heating steps from 560'c to 1130'c. 18033 1 19.93 0.41 sanidine 39Ar-40Ar incremental (plateau) jp83-i40 "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 9 heating steps from 825'c to 1180'c. 18034 1 19.17 0.27 sanidine 39Ar-40Ar incremental (plateau) p81-mh "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 9 heating steps from 800'c to 1140'c. 18035 1 18.61 0.39 sanidine 39Ar-40Ar incremental (plateau) jn87-ki (a) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 22 heating steps from 700'c to 1450'c. 18035 2 18.23 0.57 sanidine 39Ar-40Ar incremental (plateau) jn87-ki (b) "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 16 heating steps from 750'c to 1225'c. 18035 3 18.51 0.1 sanidine 39Ar-40Ar total fusion jn87-ki "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 5 analyses. 18035 4 17.96 0.84 biotite 39Ar-40Ar total fusion jn87-ki "4.962E-04, 0.581E-04, 1.1167E-04" age of volcanism The derived age is the mean of 6 analyses. 18035 5 16.42 hornblende 39Ar-40Ar total fusion jn87-ki "4.962E-04, 0.581E-04, 1.1167E-04" minimum age of volcanism The derived age is the mean of 3 analyses. 18042 1 13.9 0.4 adularia conventional K-Ar mk-127 "4.962E-04, 0.581E-04, 1.1167E-04" 14.68 2.934 77 age of intrusion 18042 2 13.6 0.4 adularia conventional K-Ar mk-127 "4.962E-04, 0.581E-04, 1.1167E-04" 14.51 2.866 75 age of intrusion 18043 1 16.2 0.5 whole rock conventional K-Ar sk-178 "4.962E-04, 0.581E-04, 1.1167E-04" 1.122 0.2639 43 age of volcanism 18044 1 0.43 0.04 whole rock conventional K-Ar ml49 "4.962E-04, 0.581E-04, 1.1167E-04" 4.42 0.0269 12 age of volcanism 18045 1 0.61 0.03 whole rock conventional K-Ar sm51 "4.962E-04, 0.581E-04, 1.1167E-04" 4.63 0.0412 68 age of volcanism 18046 1 0.95 0.14 whole rock conventional K-Ar 56b1 "4.962E-04, 0.581E-04, 1.1167E-04" 3.18 0.0443 6 age of volcanism 18047 1 0.21 0.05 whole rock conventional K-Ar 263c1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.14 0.0065 3 age of volcanism 18048 1 0.09 0.05 whole rock conventional K-Ar 366w "4.962E-04, 0.581E-04, 1.1167E-04" 0.85 0.0011 2 age of volcanism 18049 1 0.08 0.04 whole rock conventional K-Ar sm25 "4.962E-04, 0.581E-04, 1.1167E-04" 0.85 0.001 1 age of volcanism 18054 1 0.69 0.02 glass conventional K-Ar 72g001 "4.962E-04, 0.581E-04, 1.1167E-04" 5.1 0.0519 44 age of volcanism 18055 1 0.68 0.03 glass conventional K-Ar 72g002 "4.962E-04, 0.581E-04, 1.1167E-04" 5.24 0.0507 17 age of volcanism 18056 1 0.68 0.03 glass conventional K-Ar 72g003 "4.962E-04, 0.581E-04, 1.1167E-04" 5.25 0.0513 35 age of volcanism 18057 1 0.69 0.01 glass conventional K-Ar 72g004 "4.962E-04, 0.581E-04, 1.1167E-04" 5.22 0.0506 57 age of volcanism 18058 1 0.33 0.01 sanidine conventional K-Ar 72g005 "4.962E-04, 0.581E-04, 1.1167E-04" 10.96 0.0526 48 age of volcanism 18059 1 0.75 0.02 glass conventional K-Ar 72g006 "4.962E-04, 0.581E-04, 1.1167E-04" 5.02 0.0528 45 age of volcanism 18060 1 0.11 0.01 sanidine conventional K-Ar 72g007 "4.962E-04, 0.581E-04, 1.1167E-04" 10.88 0.0172 64 age of volcanism 18061 1 0.1 0.01 sanidine conventional K-Ar 72g008 "4.962E-04, 0.581E-04, 1.1167E-04" 11.24 0.0159 34 age of volcanism 18062 1 0.11 0 sanidine conventional K-Ar 72g009 "4.962E-04, 0.581E-04, 1.1167E-04" 11.32 0.0174 34 age of volcanism 18063 1 0.69 0.01 glass conventional K-Ar 72g010 "4.962E-04, 0.581E-04, 1.1167E-04" 5.07 0.0497 53 age of volcanism 18064 1 0.48 0.01 sanidine conventional K-Ar 72g011 "4.962E-04, 0.581E-04, 1.1167E-04" 10.64 0.0729 40 age of volcanism 18065 1 0.52 0.01 sanidine conventional K-Ar 72g012 "4.962E-04, 0.581E-04, 1.1167E-04" 10.45 0.0773 76 age of volcanism 18066 1 0.68 0.01 glass conventional K-Ar 72g013 "4.962E-04, 0.581E-04, 1.1167E-04" 5.14 0.0504 42 age of volcanism 18067 1 0.65 0.01 glass conventional K-Ar 72g014 "4.962E-04, 0.581E-04, 1.1167E-04" 5.15 0.0472 35 age of volcanism 18068 1 0.15 0.07 whole rock conventional K-Ar 72g015 "4.962E-04, 0.581E-04, 1.1167E-04" 1.65 0.0037 3 age of volcanism 18069 1 0.15 0.03 whole rock conventional K-Ar 72g016 "4.962E-04, 0.581E-04, 1.1167E-04" 1.66 0.0037 9 age of volcanism 18070 1 0.12 0 sanidine conventional K-Ar 72g017 "4.962E-04, 0.581E-04, 1.1167E-04" 10.63 0.0173 32 age of volcanism 18071 1 0.23 0.08 whole rock conventional K-Ar 73g001 "4.962E-04, 0.581E-04, 1.1167E-04" 2.13 0.007 3 age of volcanism 18072 1 149 0.02 whole rock conventional K-Ar 73g008 "4.962E-04, 0.581E-04, 1.1167E-04" 2 0.0043 9 age of volcanism 18073 1 0.11 0.01 whole rock conventional K-Ar 73g009 "4.962E-04, 0.581E-04, 1.1167E-04" 1.63 0.0027 13 age of volcanism 18074 1 2.95 0.09 whole rock conventional K-Ar 73g010 "4.962E-04, 0.581E-04, 1.1167E-04" 3.01 0.1279 70 age of volcanism 18075 1 0.13 0.03 whole rock conventional K-Ar 73g012 "4.962E-04, 0.581E-04, 1.1167E-04" 2.26 0.0048 6 age of volcanism 18075 2 0.21 0.03 whole rock conventional K-Ar 73g012 "4.962E-04, 0.581E-04, 1.1167E-04" 2.3 0.0108 6 age of volcanism 18076 1 0.06 0.01 whole rock conventional K-Ar 73g014 "4.962E-04, 0.581E-04, 1.1167E-04" 1.82 0.0019 4 age of volcanism 18077 1 1.96 0.06 sanidine conventional K-Ar 73g016 "4.962E-04, 0.581E-04, 1.1167E-04" 9.75 0.2775 62 age of volcanism 18078 1 0.36 0.01 sanidine conventional K-Ar 73g017 "4.962E-04, 0.581E-04, 1.1167E-04" 11.34 0.0581 58 age of volcanism 18078 2 0.52 0.11 biotite conventional K-Ar 73g017 "4.962E-04, 0.581E-04, 1.1167E-04" 8.93 0.0664 5 age of volcanism 18079 1 0.15 0.03 biotite conventional K-Ar 73g018 "4.962E-04, 0.581E-04, 1.1167E-04" 8.6 0.0142 3 age of volcanism 18080 1 0.14 0.08 biotite conventional K-Ar 73g019 "4.962E-04, 0.581E-04, 1.1167E-04" 7.12 0.0146 3 age of volcanism 18081 1 0.1 0.01 whole rock conventional K-Ar 73g021 "4.962E-04, 0.581E-04, 1.1167E-04" 1.57 0.0023 5 age of volcanism 18082 1 0.13 0.07 biotite conventional K-Ar 73g022 "4.962E-04, 0.581E-04, 1.1167E-04" 8.5 0.0158 3 age of volcanism 18083 1 0.05 0.01 sanidine conventional K-Ar 73g023 "4.962E-04, 0.581E-04, 1.1167E-04" 7.76 0.0058 9 age of volcanism 18083 2 0.1 0.03 biotite conventional K-Ar 73g023 "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 0.014 3 age of volcanism 18084 1 0.12 0.04 biotite conventional K-Ar 73g024 "4.962E-04, 0.581E-04, 1.1167E-04" 8.22 0.0144 2 age of volcanism 18085 1 0.09 0.01 whole rock conventional K-Ar 73g025 "4.962E-04, 0.581E-04, 1.1167E-04" 2.63 0.0037 7 age of volcanism 18086 1 0.53 0.01 sanidine conventional K-Ar 74g001 "4.962E-04, 0.581E-04, 1.1167E-04" 10.62 0.0783 61 age of volcanism 18086 2 0.65 0.04 biotite conventional K-Ar 74g001 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 0.0695 8 age of volcanism 18087 1 0.51 0.01 sanidine conventional K-Ar 74g002 "4.962E-04, 0.581E-04, 1.1167E-04" 10.6 0.077 67 age of volcanism 18087 2 0.73 0.09 biotite conventional K-Ar 74g002 "4.962E-04, 0.581E-04, 1.1167E-04" 8.48 0.0887 9 age of volcanism 18088 1 0.33 0.02 sanidine conventional K-Ar 74g003 "4.962E-04, 0.581E-04, 1.1167E-04" 9.72 0.0423 7 age of volcanism 18089 1 0.26 0.05 biotite conventional K-Ar 74g004 "4.962E-04, 0.581E-04, 1.1167E-04" 8.12 0.0392 4 age of volcanism 18090 1 0.21 0.04 biotite conventional K-Ar 74g005 "4.962E-04, 0.581E-04, 1.1167E-04" 8.17 0.0297 5 age of volcanism 18091 1 0.1 0.01 whole rock conventional K-Ar 74g006 "4.962E-04, 0.581E-04, 1.1167E-04" 3.91 0.0057 25 age of volcanism 18092 1 0.21 0.02 anorthoclase conventional K-Ar 74g009 "4.962E-04, 0.581E-04, 1.1167E-04" 2.69 0.0063 13 age of volcanism 18092 2 0.19 0.04 biotite conventional K-Ar 74g009 "4.962E-04, 0.581E-04, 1.1167E-04" 7.82 0.0235 3 age of volcanism 18093 1 0.24 0.03 whole rock conventional K-Ar 74g011 "4.962E-04, 0.581E-04, 1.1167E-04" 0.997 0.0036 5 age of volcanism 18094 1 0.29 0.03 glass conventional K-Ar 509-27-6 "4.962E-04, 0.581E-04, 1.1167E-04" 4.85 0.0201 20 age of volcanism 18107 1 85.5 2.1 biotite conventional K-Ar mp-82 "4.962E-04, 0.581E-04, 1.1167E-04" 9.21 11.583 81 age of intrusion 18107 2 95.2 2.8 hornblende conventional K-Ar mp-82 "4.962E-04, 0.581E-04, 1.1167E-04" 1.17 1.625 71 age of intrusion 18108 1 88.7 2.2 biotite conventional K-Ar mp-455 "4.962E-04, 0.581E-04, 1.1167E-04" 9.3 12.15 65 age of intrusion 18108 2 85.1 2.5 hornblende conventional K-Ar mp-455 "4.962E-04, 0.581E-04, 1.1167E-04" 1 1.253 63 age of intrusion 18109 1 84.2 2.1 biotite conventional K-Ar mp-789 "4.962E-04, 0.581E-04, 1.1167E-04" 9.43 11.683 79 age of intrusion 18109 2 87.4 2.6 hornblende conventional K-Ar mp-789 "4.962E-04, 0.581E-04, 1.1167E-04" 0.82 1.057 38 age of intrusion 18110 1 3.6 0.06 phlogopite conventional K-Ar vmp-76-21 "4.962E-04, 0.581E-04, 1.1167E-04" 9.83 0.5105 25 age of volcanism 18110 2 3.55 0.21 phlogopite 39Ar-40Ar total fusion vmp-76-21 "4.962E-04, 0.581E-04, 1.1167E-04" 18 age of volcanism 18111 1 3.04 0.04 phlogopite conventional K-Ar mp-841a "4.962E-04, 0.581E-04, 1.1167E-04" 8.8 0.3859 33 age of volcanism 18111 2 4.05 0.22 phlogopite 39Ar-40Ar total fusion mp-841a "4.962E-04, 0.581E-04, 1.1167E-04" 19 age of volcanism 18111 3 3.68 0.18 phlogopite 39Ar-40Ar total fusion mp-841a "4.962E-04, 0.581E-04, 1.1167E-04" 21 age of volcanism 18111 4 3.6 0.1 sanidine 39Ar-40Ar total fusion mp-841a "4.962E-04, 0.581E-04, 1.1167E-04" 40 age of volcanism 18112 1 66.4 0.9 muscovite 39Ar-40Ar total fusion mc-3m-29 "4.962E-04, 0.581E-04, 1.1167E-04" "material inherited from source rock, maximum age for unit" "On the basis of mica Ar retention dates, praluminous granites of the Idaho batholith and northern Nev are the likely soources for the Montgomery Creek micas." 18112 2 77.3 1.9 muscovite 39Ar-40Ar total fusion mc-3m-30 "4.962E-04, 0.581E-04, 1.1167E-04" "material inherited from source rock, maximum age for unit" "On the basis of mica Ar retention dates, praluminous granites of the Idaho batholith and northern Nev are the likely soources for the Montgomery Creek micas." 18112 3 61.2 0.6 muscovite 39Ar-40Ar total fusion mc-3m-31 "4.962E-04, 0.581E-04, 1.1167E-04" "material inherited from source rock, maximum age for unit" "On the basis of mica Ar retention dates, praluminous granites of the Idaho batholith and northern Nev are the likely soources for the Montgomery Creek micas." 18112 4 41.7 4.1 muscovite 39Ar-40Ar total fusion mc-3b-33 "4.962E-04, 0.581E-04, 1.1167E-04" "material inherited from source rock, maximum age for unit" "On the basis of mica Ar retention dates, praluminous granites of the Idaho batholith and northern Nev are the likely soources for the Montgomery Creek micas." 18112 5 66.2 8.5 muscovite 39Ar-40Ar total fusion mc-4b-06 "4.962E-04, 0.581E-04, 1.1167E-04" "material inherited from source rock, maximum age for unit" "On the basis of mica Ar retention dates, praluminous granites of the Idaho batholith and northern Nev are the likely soources for the Montgomery Creek micas." 18112 6 82.4 9.4 muscovite 39Ar-40Ar total fusion mc-4b-07 "4.962E-04, 0.581E-04, 1.1167E-04" "material inherited from source rock, maximum age for unit" "On the basis of mica Ar retention dates, praluminous granites of the Idaho batholith and northern Nev are the likely soources for the Montgomery Creek micas." 18113 1 160.2 3.8 biotite conventional K-Ar cd-61 "4.962E-04, 0.581E-04, 1.1167E-04" 7.98 19.11 84 age of intrusion 18114 1 153.2 4.1 biotite conventional K-Ar cd-100 "4.962E-04, 0.581E-04, 1.1167E-04" 9.317 21.41 96 age of intrusion 18115 1 78.5 1.6 biotite conventional K-Ar cd-118 "4.962E-04, 0.581E-04, 1.1167E-04" 8.827 10.06 74 minimum age of intrusion 18115 2 78.8 1.8 biotite conventional K-Ar cd-118 "4.962E-04, 0.581E-04, 1.1167E-04" 8.827 10.28 78 minimum age of intrusion 18115 3 157.1 3.1 muscovite conventional K-Ar cd-118 "4.962E-04, 0.581E-04, 1.1167E-04" 10.307 24.06 97 age of intrusion 18116 1 168 3.2 muscovite conventional K-Ar cd-117 "4.962E-04, 0.581E-04, 1.1167E-04" 10.298 25.93 97 age of intrusion 18116 2 132.6 1.7 Unk conventional K-Ar cd-117 "4.962E-04, 0.581E-04, 1.1167E-04" 9.047 17.91 94 minimum age of intrusion 18117 1 208.8 4.6 hornblende conventional K-Ar cd-64 "4.962E-04, 0.581E-04, 1.1167E-04" 0.958 3.127 81 age of intrusion 18118 1 167.3 2.7 hornblende conventional K-Ar cd-116 "4.962E-04, 0.581E-04, 1.1167E-04" 0.534 1.35 56 age of intrusion 18118 2 166.7 3.2 hornblende conventional K-Ar cd-116 "4.962E-04, 0.581E-04, 1.1167E-04" 0.534 1.341 81 age of intrusion 18119 1 163 2.8 hornblende 39Ar-40Ar incremental (plateau) pp6 "4.962E-04, 0.581E-04, 1.1167E-04" 0.277 CT140 A mean age of 161.1+-1.7 dates the cooling followiing amphibolite facies M/M. 18119 2 160.6 2.2 hornblende 39Ar-40Ar incremental (plateau) pp13 "4.962E-04, 0.581E-04, 1.1167E-04" 0.458 CT140 A mean age of 161.1+-1.7 dates the cooling followiing amphibolite facies M/M. 18119 3 161.8 2.2 hornblende 39Ar-40Ar incremental (plateau) pp1 "4.962E-04, 0.581E-04, 1.1167E-04" 0.447 CT140 A mean age of 161.1+-1.7 dates the cooling followiing amphibolite facies M/M. 18120 1 12.2 0.1 adularia conventional K-Ar sg87bol-2 "4.962E-04, 0.581E-04, 1.1167E-04" 15.57 2.755 71 CT140 Date refers to age of mineralization. 18121 1 13.5 0.1 adularia conventional K-Ar sg875bm-1 "4.962E-04, 0.581E-04, 1.1167E-04" 15.68 3.072 8 CT140 Date refers to age of mineralization. 18122 1 13.5 0.1 adularia conventional K-Ar sg87bq-1 "4.962E-04, 0.581E-04, 1.1167E-04" 14.64 2.866 83 CT140 Date refers to age of mineralization. 18123 1 1.1 0.1 whole rock conventional K-Ar usgs(D) TSV-228-79 "4.962E-04, 0.581E-04, 1.1167E-04" 2.34 0.0036 1 age of volcanism 18124 1 14.9 0.5 biotite conventional K-Ar usgs(D) TSV-399-82 "4.962E-04, 0.581E-04, 1.1167E-04" 8.14 1.752 38 age of volcanism 18125 1 4 0.1 whole rock conventional K-Ar usgs(D) TSV-383-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.5 0.0856 20 minimum age of volcanism 18126 1 19.8 1.4 plagioclase conventional K-Ar 28-7 "4.962E-04, 0.581E-04, 1.1167E-04" 1.14 0.3257 64 age of volcanism 18127 1 20 1 sanidine conventional K-Ar 11-1a "4.962E-04, 0.581E-04, 1.1167E-04" 6.43 1.862 56 age of volcanism 18128 1 19.9 0.7 whole rock conventional K-Ar 2-Dec "4.962E-04, 0.581E-04, 1.1167E-04" 1.59 0.4562 64 age of volcanism 18129 1 20.2 1.3 whole rock conventional K-Ar ag-3 "4.962E-04, 0.581E-04, 1.1167E-04" 3.48 1.0145 69 age of volcanism K2O% avg by comp. 18130 1 11.1 0.3 whole rock conventional K-Ar USGS(D)A3-38 "4.962E-04, 0.581E-04, 1.1167E-04" 13.83 2.219 59 minimum age of volcanism The calculated wh-rk age is anamalously young. 18131 1 71.2 2.6 biotite conventional K-Ar USGS(D)H80GM-227 "4.962E-04, 0.581E-04, 1.1167E-04" 8.42 8.81 80 The age is probably a reduced age (cooling age) and may represent a period of tectonic uplift in the Granite Mtn. 18132 1 70.9 2.6 biotite conventional K-Ar USGS(D)H80GM-225 "4.962E-04, 0.581E-04, 1.1167E-04" 8.87 9.231 85 K2O % avg by comp. The age is probably a reduced age (cooling age) and may represent a period of tectonic uplift in the Granite Mtn. 18133 1 74.2 4.5 hornblende conventional K-Ar USGS(D)H80GM-435 "4.962E-04, 0.581E-04, 1.1167E-04" 0.87 0.9427 70 K2O % avg by comp. Age is reduced representing subsequent uplift and cooling of the pluton. 18134 1 173 10 hornblende conventional K-Ar USGS(D)H80MM-223 "4.962E-04, 0.581E-04, 1.1167E-04" 0.99 2.579 81 age of intrusion (CT140) A K-Ar age of 152 Ma has been obtained on coesisting biotite by M.A pernokas. 18135 1 159 6 biotite conventional K-Ar USGS(G)H80Co-424 "4.962E-04, 0.581E-04, 1.1167E-04" 8.96 21.38 91 age of intrusion 18136 1 18.6 0.6 sanidine conventional K-Ar "4.962E-04, 0.581E-04, 1.1167E-04" 8.37 2.253 81 age of volcanism 18137 1 192 5 muscovite conventional K-Ar USGS(D)K478-62 "4.962E-04, 0.581E-04, 1.1167E-04" 10.85 31.73 85 minimum age of intrusion 18138 1 21.3 1.7 hornblende conventional K-Ar USGS(D)H80Cal-147 "4.962E-04, 0.581E-04, 1.1167E-04" 0.84 0.2596 35 age of intrusion 18139 1 61.3 1.4 muscovite conventional K-Ar USGS(D)H791M-270 "4.962E-04, 0.581E-04, 1.1167E-04" 10.81 9.696 79 minimum age of intrusion 18140 1 66.9 2.3 biotite conventional K-Ar USGS(D)KH78-30b "4.962E-04, 0.581E-04, 1.1167E-04" 9.13 8.951 87 "CT140 Age is not age of xllization, but age of uplift and cooling." 18141 1 71 2.6 biotite conventional K-Ar USGS(D)PS78-9 "4.962E-04, 0.581E-04, 1.1167E-04" 9.08 9.455 88 age of metamorphic crystallization K2O avg by comp. 18141 2 72.3 1.7 muscovite conventional K-Ar USGS(D)PS78-9 "4.962E-04, 0.581E-04, 1.1167E-04" 10.52 11.18 85 age of metamorphic crystallization K2O% avg by comp. 18142 1 68.7 2.5 biotite conventional K-Ar USGS(D)OW79(CM) "4.962E-04, 0.581E-04, 1.1167E-04" 9.18 9.245 90 18142 2 68.5 1.6 muscovite conventional K-Ar USGS(D)OW79(CM) "4.962E-04, 0.581E-04, 1.1167E-04" 10.42 10.47 89 age of metamorphic crystallization 18143 1 64.1 2.2 biotite conventional K-Ar USGS(D)KH78-10 "4.962E-04, 0.581E-04, 1.1167E-04" 8.89 8.351 94 minimum age of intrusion 18144 1 17.9 0.6 biotite conventional K-Ar USGS(D)BJ80Ch-199 "4.962E-04, 0.581E-04, 1.1167E-04" 8.31 2.155 66 minimum age of volcanism 18144 2 20.7 1.3 hornblende conventional K-Ar USGS(D)BJ80Ch-199 "4.962E-04, 0.581E-04, 1.1167E-04" 0.68 0.2022 23 minimum age of volcanism 18145 1 17.2 0.6 biotite conventional K-Ar USGS(D)H80Ch-307 "4.962E-04, 0.581E-04, 1.1167E-04" 8.89 2.217 59 minimum age of intrusion 18146 1 24.5 0.7 sericite conventional K-Ar USGS(D)WWM-300 "4.962E-04, 0.581E-04, 1.1167E-04" 8.317 2.956 51 Age probably reflects time of mineralization and is a min age for the pluton. 18147 1 47.6 1.1 feldspar conventional K-Ar USGS(D)MWC-43-76 "4.962E-04, 0.581E-04, 1.1167E-04" 6.73 4.677 82 age of metamorphic crystallization Material is a mixture of kf and plag. Age probably reflects time of mineralization and is a min age for the pluton. 18148 1 61.7 2.2 biotite conventional K-Ar USGS(D)BJ80LM-119 "4.962E-04, 0.581E-04, 1.1167E-04" 9.4 8.489 87 Age reflects uplift and cooling. 18149 1 65.9 2.4 biotite conventional K-Ar USGS(D)H80LM-374 "4.962E-04, 0.581E-04, 1.1167E-04" 9.05 8.749 89 Age reflects uplift and cooling. 18150 1 56.1 1.3 muscovite conventional K-Ar USGS(D)H79BM-6 "4.962E-04, 0.581E-04, 1.1167E-04" 10.58 8.679 85 age of intrusion 18151 1 74.6 2.7 biotite conventional K-Ar 80FP-69 "4.962E-04, 0.581E-04, 1.1167E-04" 8.39 9.201 89 age of intrusion 18152 1 156 6 biotite conventional K-Ar USGS(D)363-DL-64 "4.962E-04, 0.581E-04, 1.1167E-04" 9.22 21.63 92 age of intrusion 18152 2 167 11 amphiboles conventional K-Ar USGS(D)363-DL-64 "4.962E-04, 0.581E-04, 1.1167E-04" 0.57 1.434 41 maximum age of intrusion 18153 1 157 6 biotite conventional K-Ar USGS(D)345-DL-66 "4.962E-04, 0.581E-04, 1.1167E-04" 7.59 17.91 95 minimum age of intrusion K2O% avg by compiler 18154 1 15.6 0.5 glass conventional K-Ar USGS(D)75fb144 "4.962E-04, 0.581E-04, 1.1167E-04" 4.82 1.085 79 age of volcanism 18155 1 25.2 0.9 biotite conventional K-Ar USGS(D)Tr "4.962E-04, 0.581E-04, 1.1167E-04" 7.54 2.758 53 age of volcanism K2O% avg by comp 18156 1 17.8 0.6 plagioclase conventional K-Ar USGS(D)Tg-hbl "4.962E-04, 0.581E-04, 1.1167E-04" 2.32 0.598 80 age of volcanism 18156 2 17.7 1.1 hornblende conventional K-Ar USGS(D)Tg-hbl "4.962E-04, 0.581E-04, 1.1167E-04" 0.73 0.1856 57 age of volcanism 18157 1 16.1 0.6 whole rock conventional K-Ar USGS(D)TV-8 "4.962E-04, 0.581E-04, 1.1167E-04" 2.47 0.5741 76 age of volcanism K2O % avg by comp 18158 1 24.8 0.9 biotite conventional K-Ar "4.962E-04, 0.581E-04, 1.1167E-04" 8.08 2.908 62 age of volcanism 18159 1 25.3 0.9 biotite conventional K-Ar USGS(D)Candelaria "4.962E-04, 0.581E-04, 1.1167E-04" 7.95 2.913 38 age of volcanism 18160 1 2.8 0.1 whole rock conventional K-Ar USGS(D)Qb-1 "4.962E-04, 0.581E-04, 1.1167E-04" 2.64 0.1072 35 age of volcanism 18161 1 2.9 1 whole rock conventional K-Ar USGS(D)Qb-2 "4.962E-04, 0.581E-04, 1.1167E-04" 2.54 0.1074 34 age of volcanism 18162 1 22.8 0.8 biotite conventional K-Ar USGS(D)Candelaria #20 "4.962E-04, 0.581E-04, 1.1167E-04" 6.85 2.262 29 age of volcanism 18163 1 26.5 0.9 biotite conventional K-Ar USGS(D)77fp-109 "4.962E-04, 0.581E-04, 1.1167E-04" 7.93 3.042 86 age of intrusion K2O % avg by comp 18164 1 26.8 1 adularia conventional K-Ar USGS(D)84dj43 "4.962E-04, 0.581E-04, 1.1167E-04" 15.6 6.05 94 age of intrusion 18165 1 26.2 0.9 biotite conventional K-Ar USGS(D)84dj33 "4.962E-04, 0.581E-04, 1.1167E-04" 8.29 3.154 66 age of volcanism 18166 1 153 9 hornblende conventional K-Ar USGS(D)77fp-83 "4.962E-04, 0.581E-04, 1.1167E-04" 0.94 2.166 82 minimum age of volcanism K2O % avg by comp. 18166 2 99.1 3.4 pyroxenes conventional K-Ar USGS(D)77fp-83 "4.962E-04, 0.581E-04, 1.1167E-04" 1.28 1.868 86 Cretaceous or Tertiary igneous activity reset the K-Ar system in the pyroxene. 18167 1 158 9 amphiboles conventional K-Ar USGS(D)77FP-85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.91 2.147 89 age of intrusion Mineral is more specifically kaersutite. 18168 1 119 4 hornblende - pyroxene conventional K-Ar USGS(D)77FP-86 "4.962E-04, 0.581E-04, 1.1167E-04" 1.18 2.082 87 minimum age of intrusion Material was a hbl-pyx concentrate. 18169 1 442 16 biotite conventional K-Ar USGS(D)77FP-23 "4.962E-04, 0.581E-04, 1.1167E-04" 5.28 38.01 96 age of intrusion 18170 1 3.6 0.1 whole rock conventional K-Ar USGS(D)VH-1-126 "4.962E-04, 0.581E-04, 1.1167E-04" 1.54 0.0809 31 age of volcanism 18171 1 0.57 0.03 whole rock conventional K-Ar USGS(D)LC12-8-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.62 0.0133 5 age of volcanism 18172 1 4.2 0.5 plagioclase conventional K-Ar USGS(D)LC12-11-20v "4.962E-04, 0.581E-04, 1.1167E-04" 0.39 0.0236 6 age of volcanism 18173 1 5.3 0.2 whole rock conventional K-Ar USGS(D)RE9-28-2 "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 0.1033 51 age of volcanism 18174 1 35.1 1.3 biotite conventional K-Ar USGS(D)SP-4-84 "4.962E-04, 0.581E-04, 1.1167E-04" 8.28 4.225 83 age of volcanism 18175 1 27.2 1 whole rock conventional K-Ar USGS(D)F-78-15 "4.962E-04, 0.581E-04, 1.1167E-04" 2.88 1.135 74 minimum age of volcanism 18176 1 98.4 3.3 biotite conventional K-Ar USGS(D)GR-1 "4.962E-04, 0.581E-04, 1.1167E-04" 8.95 13.02 81 age of intrusion 18177 1 2.7 0.2 whole rock conventional K-Ar USGS(D)TSV-413-82 "4.962E-04, 0.581E-04, 1.1167E-04" 2.05 0.0799 20 age of volcanism 18179 1 8.9 0.3 whole rock conventional K-Ar USGS(D)TSV-167-79 "4.962E-04, 0.581E-04, 1.1167E-04" 4.48 0.565 84 age of volcanism 18181 1 10.4 0.4 biotite conventional K-Ar USGS(D)TSV-65a "4.962E-04, 0.581E-04, 1.1167E-04" 7.83 1.17 44 age of volcanism K2O % avg by comp. 18181 2 9.6 0.3 sanidine conventional K-Ar USGS(D)TSV-65a "4.962E-04, 0.581E-04, 1.1167E-04" 5.23 0.7271 64 age of volcanism K2O % avg by comp. 18182 1 8.1 0.4 whole rock conventional K-Ar USGS(D)BF-380A "4.962E-04, 0.581E-04, 1.1167E-04" 1.27 0.1478 37 maximum age of volcanism 18183 1 9 0.3 whole rock conventional K-Ar USGS(D)BF-383 "4.962E-04, 0.581E-04, 1.1167E-04" 1.78 0.2317 60 age of volcanism 18184 1 10.3 0.4 whole rock conventional K-Ar USGS(D)BF-380 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.1912 29 age of volcanism 18185 1 7.5 0.3 whole rock conventional K-Ar USGS(D)BF-379 "4.962E-04, 0.581E-04, 1.1167E-04" 2.34 0.2538 53 age of volcanism 18186 1 14.6 0.9 hornblende conventional K-Ar USGS(D)BF-522 "4.962E-04, 0.581E-04, 1.1167E-04" 0.87 0.1839 36 CT140 Age is reduced and reflects a time of Miocene volcanism. 18187 1 16.3 0.4 muscovite conventional K-Ar USGS(D)TSV-296-80 "4.962E-04, 0.581E-04, 1.1167E-04" 10.64 2.51 64 CT140 Age is reduced age. 18188 1 10 0.4 biotite conventional K-Ar USGS(D)BF-591 "4.962E-04, 0.581E-04, 1.1167E-04" 7.5 1.08 54 age of volcanism 18189 1 13.9 0.5 biotite conventional K-Ar USGS(D)TSV-262-79 "4.962E-04, 0.581E-04, 1.1167E-04" 8.54 1.712 54 age of volcanism 18190 1 13.9 0.5 biotite conventional K-Ar USGS(D)TSV-260-79 "4.962E-04, 0.581E-04, 1.1167E-04" 8.39 1.683 57 age of volcanism 18191 1 13.9 0.5 biotite conventional K-Ar USGS(D)TSV-305-80 "4.962E-04, 0.581E-04, 1.1167E-04" 8.35 1.674 68 age of volcanism 18192 1 1.07 0.04 whole rock conventional K-Ar USGS(D)TSV-128-78 "4.962E-04, 0.581E-04, 1.1167E-04" 1.73 0.0267 5 age of volcanism 18193 1 10 0.4 whole rock conventional K-Ar USGS(D)TSV-168-79 "4.962E-04, 0.581E-04, 1.1167E-04" 1.97 0.2835 70 age of volcanism 18194 1 11.3 0.4 whole rock conventional K-Ar USGS(D)VH-2-1200 "4.962E-04, 0.581E-04, 1.1167E-04" 1.6 0.2605 76 maximum age of volcanism 18195 1 1.5 0.1 whole rock conventional K-Ar USGS(D)TSV-378-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.64 0.0352 12 age of volcanism 18196 1 3.85 0.13 whole rock conventional K-Ar USGS(D)CF79-24-8 "4.962E-04, 0.581E-04, 1.1167E-04" 1.59 0.0879 25 age of volcanism 18197 1 3.64 0.13 whole rock conventional K-Ar USGS(D)CF79-26-1 "4.962E-04, 0.581E-04, 1.1167E-04" 1.77 0.0925 39 age of volcanism 18199 1 0.23 0.04 whole rock conventional K-Ar USGS(D)TSV-283-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.81 0.0059 3 age of volcanism 18200 1 0.3 0.1 whole rock conventional K-Ar USGS(D)TSV-129-78 "4.962E-04, 0.581E-04, 1.1167E-04" 1.87 0.0075 25 age of volcanism 18201 1 3.2 0.1 biotite conventional K-Ar "4.962E-04, 0.581E-04, 1.1167E-04" 8.58 0.3911 30 age of volcanism 18202 1 10.1 0.3 biotite conventional K-Ar USGS(D)SW-6-79 "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 1.255 81 age of volcanism 18203 1 3.81 0.14 biotite conventional K-Ar USGS(D)83-3-19A "4.962E-04, 0.581E-04, 1.1167E-04" 8.86 0.4863 43 age of volcanism 18203 2 3.22 0.12 sanidine conventional K-Ar USGS(D)83-3-19A "4.962E-04, 0.581E-04, 1.1167E-04" 9.5 0.4405 76 age of volcanism K2O average by comp. 18206 1 11.2 0.5 whole rock conventional K-Ar USGS(D)TSV-382-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.35 0.2183 29 age of volcanism 18207 1 9.6 0.4 whole rock conventional K-Ar USGS(D)TSV-372-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.94 0.2708 41 age of volcanism 18208 1 9.9 0.4 whole rock conventional K-Ar USGS(D)TSV-370-81 "4.962E-04, 0.581E-04, 1.1167E-04" 2.71 0.3847 55 age of volcanism 18209 1 9.3 0.3 whole rock conventional K-Ar USGS(D)TSV-214-79 "4.962E-04, 0.581E-04, 1.1167E-04" 5.07 0.6819 26 age of volcanism 18210 1 8.1 0.3 whole rock conventional K-Ar USGU(D)Velh-784 "4.962E-04, 0.581E-04, 1.1167E-04" 1.36 0.159 58 age of volcanism 18211 1 8.5 0.3 whole rock conventional K-Ar USGS(D)TSV-309-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.87 0.229 41 age of volcanism 18212 1 6.3 0.2 whole rock conventional K-Ar USGS(D)TSV-293-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.29 0.118 42 age of volcanism 18213 1 13.8 0.5 whole rock conventional K-Ar USGS(D)TSV-381-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.25 0.2491 40 age of volcanism 18217 1 264.3 8 sericite conventional K-Ar 81MI "4.962E-04, 0.581E-04, 1.1167E-04" 1.61 0.6599 74 Sericite-qtz CT140 ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18218 1 236.7 5 sericite conventional K-Ar M78-47 "4.962E-04, 0.581E-04, 1.1167E-04" 2.06 0.7502 93 Sericite-qtz feldspar CT140 ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18219 1 235.1 5 sericite conventional K-Ar M78-36 "4.962E-04, 0.581E-04, 1.1167E-04" 0.48 0.1735 86 Sericite-qtz plag CT140 ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18220 1 252.3 7 sericite conventional K-Ar M78-43 "4.962E-04, 0.581E-04, 1.1167E-04" 1.25 0.4874 68 Sericite-qtz CT140 ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18221 1 289.6 4 sericite conventional K-Ar M78-37 "4.962E-04, 0.581E-04, 1.1167E-04" 0.28 0.1266 66 Sericite-qtz Ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18222 1 279.1 3 sericite conventional K-Ar M78-59 "4.962E-04, 0.581E-04, 1.1167E-04" 0.59 0.2564 85 Sericite-qtz Ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18223 1 265.2 3 sericite conventional K-Ar IM78-48 "4.962E-04, 0.581E-04, 1.1167E-04" 1.37 0.5636 88 Sericite-qtz Ages indicate a later alteration and mineralizing event about 260 Ma during the Early Permian. 18230 1 24 0.6 feldspar conventional K-Ar UAKA 85-70 "4.962E-04, 0.581E-04, 1.1167E-04" 8.036 2.788 87 age of volcanism 18231 1 19.6 0.5 biotite conventional K-Ar UAKA 82-104 "4.962E-04, 0.581E-04, 1.1167E-04" 8.602 2.433 64 age of volcanism 18232 1 20.3 0.5 biotite conventional K-Ar UAKA 83-7 "4.962E-04, 0.581E-04, 1.1167E-04" 7.316 2.153 51 age of volcanism 18233 1 20.1 0.5 biotite conventional K-Ar UAKA 76-133 "4.962E-04, 0.581E-04, 1.1167E-04" 7.479 2.176 43 age of volcanism Chloritized biotite 18233 2 23.4 0.6 hornblende conventional K-Ar UAKA 76-133 "4.962E-04, 0.581E-04, 1.1167E-04" 0.683 0.2312 47 age of volcanism 18233 3 25.6 0.6 plagioclase conventional K-Ar UAKA 76-133 "4.962E-04, 0.581E-04, 1.1167E-04" 0.944 0.3498 "sample contains excess radiogenic argon, age is too old" 18234 1 25.4 0.6 feldspar conventional K-Ar UAKA 83-73 "4.962E-04, 0.581E-04, 1.1167E-04" 3.442 1.265 85 age of volcanism Groundmass feldspar 18235 1 22.1 0.5 feldspar conventional K-Ar UAKA 81-11 "4.962E-04, 0.581E-04, 1.1167E-04" 0.941 0.3007 60 age of volcanism Groundmass feldspar 18236 1 22.5 0.5 feldspar conventional K-Ar UAKA 81-28 "4.962E-04, 0.581E-04, 1.1167E-04" 4.774 1.558 92 age of volcanism 18237 1 22.8 0.5 feldspar conventional K-Ar UAKA 76-96 "4.962E-04, 0.581E-04, 1.1167E-04" 2.154 0.7106 88 age of volcanism Groundmass feldspar 18238 1 27.4 0.7 biotite conventional K-Ar UAKA 85-69 "4.962E-04, 0.581E-04, 1.1167E-04" 8.187 3.258 62 age of volcanism 18239 1 24.4 0.5 feldspar conventional K-Ar UAKA 78-62 "4.962E-04, 0.581E-04, 1.1167E-04" 4.929 1.744 93 age of volcanism 18240 1 25.1 0.5 feldspar conventional K-Ar UAKA 78-60 "4.962E-04, 0.581E-04, 1.1167E-04" 5.816 2.112 91 age of volcanism 18241 1 25.5 0.6 feldspar conventional K-Ar UAKA 83-75 "4.962E-04, 0.581E-04, 1.1167E-04" 2.301 0.8461 86 age of volcanism Groundmass feldspar 18242 1 25.1 0.6 feldspar conventional K-Ar UAKA 78-83 "4.962E-04, 0.581E-04, 1.1167E-04" 4.495 1.635 60 age of volcanism Groundmass feldspar 18243 1 27.3 0.6 feldspar conventional K-Ar UAKA 78-41 "4.962E-04, 0.581E-04, 1.1167E-04" 2.38 0.9418 84 age of volcanism Groundmass feldspar 18244 1 34.4 0.8 biotite conventional K-Ar UAKA 87-182 "4.962E-04, 0.581E-04, 1.1167E-04" 8.747 4.372 83 age of volcanism 18245 1 19.2 0.5 biotite conventional K-Ar UAKA 87-146 "4.962E-04, 0.581E-04, 1.1167E-04" 7.055 1.959 59 age of volcanism 18247 1 25.1 0.5 biotite conventional K-Ar UAKA 76-127 "4.962E-04, 0.581E-04, 1.1167E-04" 7.704 2.816 87 age of volcanism 18248 1 1090 40 biotite conventional K-Ar USGS(D) KH78-100 "4.962E-04, 0.581E-04, 1.1167E-04" 9.05 195.9 97 minimum age of intrusion 18250 1 1510 90 hornblende conventional K-Ar USGS(D) H80Hu-344 "4.962E-04, 0.581E-04, 1.1167E-04" 0.905 30.91 97 age of intrusion 18251 1 22 0.8 biotite conventional K-Ar USGS(D) 735 "4.962E-04, 0.581E-04, 1.1167E-04" 7.455 2.379 69 age of volcanism 18252 1 22.1 0.8 biotite conventional K-Ar E-210-79 "4.962E-04, 0.581E-04, 1.1167E-04" 8.14 2.608 78 minimum age of volcanism 18253 1 23.9 0.9 biotite conventional K-Ar E-191B "4.962E-04, 0.581E-04, 1.1167E-04" 6.92 2.392 79 minimum age of volcanism 18254 1 12.4 0.8 whole rock conventional K-Ar USGS(D) Route 89-285.2 "4.962E-04, 0.581E-04, 1.1167E-04" 0.815 0.1463 47 age of volcanism 18255 1 22.3 0.8 whole rock conventional K-Ar USGS(D) PP-8 "4.962E-04, 0.581E-04, 1.1167E-04" 4.28 1.381 82 age of volcanism 18257 1 37.1 1.3 biotite conventional K-Ar USGS(D) 81D83 "4.962E-04, 0.581E-04, 1.1167E-04" 9.285 5.013 74 age of intrusion 18258 1 62.6 2.8 hornblende conventional K-Ar USGS(D) 84D31 "4.962E-04, 0.581E-04, 1.1167E-04" 0.735 0.6741 65 age of intrusion 18259 1 26.6 3.1 hornblende conventional K-Ar USGS(D) 78T105 "4.962E-04, 0.581E-04, 1.1167E-04" 0.69 0.2757 64 age of volcanism 18260 1 22 2.1 plagioclase conventional K-Ar USGS(D) 78T104 "4.962E-04, 0.581E-04, 1.1167E-04" 1.1025 0.3507 61 minimum age of volcanism 18261 1 26.1 0.9 K feldspar conventional K-Ar USGS(D) 78T106 "4.962E-04, 0.581E-04, 1.1167E-04" 9.735 3.683 70 age of volcanism 18262 1 8 0.5 whole rock conventional K-Ar USGS(D) 81D135 "4.962E-04, 0.581E-04, 1.1167E-04" 0.96 0.1112 54 age of volcanism 18264 1 1340 30 muscovite conventional K-Ar USGS(D) 79D299 "4.962E-04, 0.581E-04, 1.1167E-04" 10.255 291.9 95 age of intrusion 18267 1 34.2 1.2 biotite conventional K-Ar USGS(D) 78D81 "4.962E-04, 0.581E-04, 1.1167E-04" 7.32 3.64 85 age of intrusion 18267 2 32.7 2 hornblende conventional K-Ar USGS(D) 78D81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.925 0.439 63 age of intrusion 18269 1 25.7 0.9 biotite conventional K-Ar USGS(D) 78D147 "4.962E-04, 0.581E-04, 1.1167E-04" 8.355 3.116 66 age of volcanism 18270 1 32 1.1 biotite conventional K-Ar USGS(D) 78D132 "4.962E-04, 0.581E-04, 1.1167E-04" 6.105 2.836 76 age of volcanism 18272 1 28.7 1 biotite conventional K-Ar USGS(D) 78D152 "4.962E-04, 0.581E-04, 1.1167E-04" 3.645 1.519 64 age of volcanism Impure biotite concentrate 18273 1 33.5 1.9 hornblende conventional K-Ar USGS(D) 84D85 "4.962E-04, 0.581E-04, 1.1167E-04" 0.76 0.3702 62 age of volcanism 18274 1 9 0.4 whole rock conventional K-Ar USGS(D) 83D44a "4.962E-04, 0.581E-04, 1.1167E-04" 0.83 0.1079 46 age of volcanism 18275 1 27.4 1 sanidine conventional K-Ar USGS(D) 84D103 "4.962E-04, 0.581E-04, 1.1167E-04" 5.385 2.139 74 age of volcanism 18276 1 74.3 2.7 biotite conventional K-Ar USGS(D) 83D130 "4.962E-04, 0.581E-04, 1.1167E-04" 7.515 8.205 81 age of volcanism 18277 1 34.1 1.2 biotite conventional K-Ar USGS(D) 83D144 "4.962E-04, 0.581E-04, 1.1167E-04" 8.575 4.254 79 age of volcanism 18278 1 19.3 0.7 whole rock conventional K-Ar USGS(D) 82R198 "4.962E-04, 0.581E-04, 1.1167E-04" 3.45 0.9664 74 age of volcanism 18279 1 24.1 0.9 sanidine conventional K-Ar USGS(D) E-28-84 "4.962E-04, 0.581E-04, 1.1167E-04" 7.58 2.651 71 age of volcanism 18280 1 22.9 0.8 sanidine conventional K-Ar USGS(D) E-119-83 "4.962E-04, 0.581E-04, 1.1167E-04" 4.08 1.356 84 age of volcanism 18281 1 9.8 0.4 glass conventional K-Ar USGS(D) 82M87 "4.962E-04, 0.581E-04, 1.1167E-04" 1.125 0.159 57 minimum age of volcanism 18282 1 34.3 1.2 biotite conventional K-Ar USGS(D) 83D104 "4.962E-04, 0.581E-04, 1.1167E-04" 7.385 3.684 79 age of volcanism 18282 2 34.2 2.1 hornblende conventional K-Ar USGS(D) 83D104 "4.962E-04, 0.581E-04, 1.1167E-04" 0.75 0.373 77 age of volcanism 18283 1 73.6 2.6 biotite conventional K-Ar USGS(D) 83D88 "4.962E-04, 0.581E-04, 1.1167E-04" 8.62 9.316 95 age of volcanism 18284 1 36.7 1.3 hornblende conventional K-Ar MHS-114-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.525 0.8155 68 age of volcanism 18285 1 32.3 1.5 hornblende conventional K-Ar MHS-133-80 "4.962E-04, 0.581E-04, 1.1167E-04" 1.27 0.5965 67 age of volcanism 18286 1 7.7 0.5 hornblende conventional K-Ar MHS-18-81 "4.962E-04, 0.581E-04, 1.1167E-04" 0.545 0.0603 34 age of volcanism 18287 1 8.1 0.6 hornblende conventional K-Ar MHS-67-80 "4.962E-04, 0.581E-04, 1.1167E-04" 0.535 0.0624 29 age of volcanism 18288 1 25.3 0.9 hornblende conventional K-Ar MHS-86-81 "4.962E-04, 0.581E-04, 1.1167E-04" 1.215 0.4457 74 age of volcanism 18291 1 16.1 0.7 adularia conventional K-Ar USGS(D) Fanny-A "4.962E-04, 0.581E-04, 1.1167E-04" 14.405 3.346 86 minimum age of mineralization 18292 1 26.3 1.7 sanidine conventional K-Ar IPE-A1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.12 2.338 84 age of volcanism 18293 1 25.9 0.9 sanidine conventional K-Ar TP-83-43 "4.962E-04, 0.581E-04, 1.1167E-04" 7.72 2.894 88 age of volcanism 18294 1 25.9 2.1 sanidine conventional K-Ar 82-101 "4.962E-04, 0.581E-04, 1.1167E-04" 6.94 2.606 84 age of volcanism 18295 1 27.1 3.8 sanidine conventional K-Ar TP-83-38 "4.962E-04, 0.581E-04, 1.1167E-04" 4.225 1.661 67 age meaning uncertain (analysis questionable) Original sanidine separate 18295 2 25 0.9 sanidine conventional K-Ar TP-83-38 "4.962E-04, 0.581E-04, 1.1167E-04" 6.85 2.479 60 age of volcanism Up-graded sanidine separate 18296 1 25.7 0.9 sanidine conventional K-Ar TP-83-45 "4.962E-04, 0.581E-04, 1.1167E-04" 6.235 2.325 87 age of volcanism 18297 1 29.2 1.6 sanidine conventional K-Ar USGS(D) TP-83-24 "4.962E-04, 0.581E-04, 1.1167E-04" 8.66 3.666 92 age meaning uncertain (analysis questionable) 18298 1 21.4 1.3 sanidine conventional K-Ar TP-38-41 "4.962E-04, 0.581E-04, 1.1167E-04" 6.05 1.873 88 age meaning uncertain (analysis questionable) Original sanidine separate 18298 2 27.3 1 sanidine conventional K-Ar TP-38-41 "4.962E-04, 0.581E-04, 1.1167E-04" 7.96 3.156 85 age of volcanism Up-graded sanidine separate 18299 1 26.6 1 sanidine conventional K-Ar TP-83-44 "4.962E-04, 0.581E-04, 1.1167E-04" 7.01 2.699 88 age of volcanism 18300 1 25.7 0.9 sanidine conventional K-Ar TP-83-42 "4.962E-04, 0.581E-04, 1.1167E-04" 4.605 1.716 88 age of volcanism 18301 1 41 7.4 whole rock conventional K-Ar USGS(D) 84-039 "4.962E-04, 0.581E-04, 1.1167E-04" 0.165 0.0985 23 minimum age of volcanism Very low potassium content in basalt 18302 1 36 3.1 whole rock conventional K-Ar USGS(D) 84-031 "4.962E-04, 0.581E-04, 1.1167E-04" 2.5 1.309 77 minimum age of intrusion 18303 1 22.6 0.8 K feldspar conventional K-Ar USGS(D) 84-064 "4.962E-04, 0.581E-04, 1.1167E-04" 8.64 2.836 80 minimum age of volcanism 18304 1 40.8 1.5 biotite conventional K-Ar MS-18 "4.962E-04, 0.581E-04, 1.1167E-04" 8.625 5.127 86 age of volcanism 18305 1 31.8 1.1 biotite conventional K-Ar USGS(D) AC-8-A-80 "4.962E-04, 0.581E-04, 1.1167E-04" 8.045 3.718 82 age of volcanism 18306 1 61.6 2.2 hornblende conventional K-Ar USGS(D) 78525 "4.962E-04, 0.581E-04, 1.1167E-04" 1.52 1.372 85 age of intrusion 18307 1 31.7 1.1 biotite conventional K-Ar USGS(D) Wm-2-77 "4.962E-04, 0.581E-04, 1.1167E-04" 8.015 3.687 59 age of volcanism 18307 2 27.1 0.9 sanidine conventional K-Ar USGS(D) Wm-2-77 "4.962E-04, 0.581E-04, 1.1167E-04" 8.17 3.212 85 minimum age of volcanism 18308 1 50 1.8 biotite conventional K-Ar USGS(D) T-1-83 "4.962E-04, 0.581E-04, 1.1167E-04" 8.855 6.466 82 age of volcanism 18309 1 1410 50 biotite conventional K-Ar USGS(D) R-75-78 "4.962E-04, 0.581E-04, 1.1167E-04" 5.34 164.3 99 age of metamorphic crystallization 18310 1 72.5 4.7 hornblende conventional K-Ar USGS(D) R-34A-78 "4.962E-04, 0.581E-04, 1.1167E-04" 0.585 0.6232 74 age of intrusion 18311 1 1380 45 biotite conventional K-Ar USGS(D) R-229-78 "4.962E-04, 0.581E-04, 1.1167E-04" 7.69 228.8 96 age of intrusion 18312 1 21.3 0.7 biotite conventional K-Ar USGS(D) T-1-79 "4.962E-04, 0.581E-04, 1.1167E-04" 8.775 2.712 83 age of volcanism 18313 1 22.6 0.8 whole rock conventional K-Ar USGS(D) SR-6-79 "4.962E-04, 0.581E-04, 1.1167E-04" 4.87 1.594 77 minimum age of volcanism 18314 1 33.1 1.1 biotite conventional K-Ar USGS(D) SR-59-78 "4.962E-04, 0.581E-04, 1.1167E-04" 7.825 3.763 88 age of volcanism 18314 2 20.3 0.7 sanidine conventional K-Ar USGS(D) SR-59-78 "4.962E-04, 0.581E-04, 1.1167E-04" 7.56 2.216 86 age meaning uncertain (analysis questionable) 18315 1 33.8 1.1 biotite conventional K-Ar USGS(D) SR-109-78 "4.962E-04, 0.581E-04, 1.1167E-04" 7.025 3.456 79 age of volcanism 18316 1 33.3 1.1 biotite conventional K-Ar USGS(D) SR-4-79 "4.962E-04, 0.581E-04, 1.1167E-04" 7.825 3.788 78 age of volcanism 18317 1 34.4 1.2 biotite conventional K-Ar USGS(D) SR-SE-1-RR "4.962E-04, 0.581E-04, 1.1167E-04" 7.99 3.993 78 age of volcanism 18318 1 34.5 1.6 sanidine conventional K-Ar USGS(D) T-24-78 "4.962E-04, 0.581E-04, 1.1167E-04" 7.755 3.891 76 age of volcanism 18319 1 34.4 2.2 hornblende conventional K-Ar USGS(D) CP-24-79 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7 0.3502 51 age of volcanism 18320 1 33.3 1.1 biotite conventional K-Ar USGS(D) CP-74-79 "4.962E-04, 0.581E-04, 1.1167E-04" 7.95 3.851 76 age of volcanism 18321 1 32.4 1.1 biotite conventional K-Ar USGS(D) SR-2-79 "4.962E-04, 0.581E-04, 1.1167E-04" 7.655 3.606 90 age of volcanism Golden colored biotite 18322 1 59.8 4.4 hornblende conventional K-Ar USGS(D) 77D197 "4.962E-04, 0.581E-04, 1.1167E-04" 0.35 0.3061 59 age of intrusion 18323 1 35.7 1.2 biotite conventional K-Ar USGS(D) 77D8 "4.962E-04, 0.581E-04, 1.1167E-04" 7.88 4.091 81 age of volcanism 18324 1 4460 300 plagioclase conventional K-Ar USGS(D) GH-MG-75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.56 156.4 99 "sample contains excess radiogenic argon, age is too old" 18324 2 4460 450 augite-ferroaugite conventional K-Ar USGS(D) GH-MG-75 "4.962E-04, 0.581E-04, 1.1167E-04" 0.33 93.18 98 "sample contains excess radiogenic argon, age is too old" 18325 1 31.5 1.1 plagioclase conventional K-Ar USGS(D) SF-138-77 "4.962E-04, 0.581E-04, 1.1167E-04" 1.125 0.5149 74 age of volcanism 18326 1 33.7 1.1 biotite conventional K-Ar USGS(D) AH-2-77 "4.962E-04, 0.581E-04, 1.1167E-04" 6.72 3.294 77 age of volcanism 18326 2 36.9 8 hornblende conventional K-Ar USGS(D) AH-2-77 "4.962E-04, 0.581E-04, 1.1167E-04" 0.7125 0.3811 42 maximum age of volcanism 18328 1 31.6 1.1 biotite conventional K-Ar USGS(D) 76T142 "4.962E-04, 0.581E-04, 1.1167E-04" 8.305 3.807 70 age of volcanism 18329 1 17.9 0.6 whole rock conventional K-Ar USGS(D) 76T151 "4.962E-04, 0.581E-04, 1.1167E-04" 3.55 0.9189 87 age of volcanism 18331 1 34.9 1.3 biotite conventional K-Ar USGS(D) 81D154 "4.962E-04, 0.581E-04, 1.1167E-04" 4.4 2.233 53 age of intrusion Biotite-chlorite mixture 18332 1 31.7 1.1 whole rock conventional K-Ar USGS(D) 83D180 "4.962E-04, 0.581E-04, 1.1167E-04" 3.54 1.629 80 minimum age of volcanism 18355 1 157 6 biotite conventional K-Ar 1 63ALe 14b "4.72E-04, 0.585E-04, 1.19E-04" 3.97 9.633 90 "material inherited from source rock, maximum age for unit" 18356 1 142 5 hornblende conventional K-Ar 2 AGz 213 "4.962E-04, 0.581E-04, 1.1167E-04" 0.67 1.46 83 age of intrusion 18357 1 141 5 hornblende conventional K-Ar 3 63ALe 15 "4.962E-04, 0.581E-04, 1.1167E-04" 0.776 1.684 87 age of intrusion 18358 1 126 4 biotite conventional K-Ar 4 63AGz 162 "4.962E-04, 0.581E-04, 1.1167E-04" 7.3 14.11 92 age of intrusion 18359 1 70.2 biotite conventional K-Ar KA-585-I (58-7) "4.72E-04, 0.584E-04, 1.19E-04" 8.794 9.281 73 age of intrusion 18359 2 69 biotite conventional K-Ar KA-585-II (58-7) "4.962E-04, 0.581E-04, 1.1167E-04" 8.794 9.122 83 age of intrusion 18360 1 75 biotite conventional K-Ar KA-586 (Cone Pk) "4.962E-04, 0.581E-04, 1.1167E-04" 8.601 9.715 79 age of metamorphic crystallization 18361 1 92 hornblende conventional K-Ar KA-399 (JS-145BD) "4.962E-04, 0.581E-04, 1.1167E-04" 1 1.4083 87 age of intrusion 18362 1 14 1 biotite conventional K-Ar TS-1 "4.72E-04, 0.585E-04, 1.19E-04" 4.32 0.8875 41 age of later metamorphism 18363 1 11 1 biotite conventional K-Ar TS-2 "4.72E-04, 0.585E-04, 1.19E-04" 6.29 1.008 49 age of later metamorphism 18365 1 12 1 K feldspar conventional K-Ar TS-4 "4.72E-04, 0.585E-04, 1.19E-04" 5.93 1.098 44 age of intrusion 18366 1 14 1 K feldspar conventional K-Ar TS-5 "4.72E-04, 0.585E-04, 1.19E-04" 3.7 0.785 17 age of intrusion 18367 1 63.9 2 biotite conventional K-Ar RM-7-63 "4.76E-04, 0.589E-04, 1.18E-04" 7.54 7.23 83 age of intrusion 18368 1 67.9 2.1 biotite conventional K-Ar RM-6-63 "4.76E-04, 0.589E-04, 1.18E-04" 8.59 8.76 82 age of intrusion 18369 1 53.5 1.9 biotite conventional K-Ar RM-3-64 "4.76E-04, 0.589E-04, 1.18E-04" 9.26 7.41 71 minimum age of intrusion 18370 1 62.6 2 phlogopite conventional K-Ar RM-1-62 "4.76E-04, 0.589E-04, 1.18E-04" 10.08 9.46 81 age of mineralization 18371 1 60.6 1.8 muscovite conventional K-Ar RM-3-62 "4.76E-04, 0.589E-04, 1.18E-04" 9.32 8.47 89 age of mineralization 18372 1 50.7 1.1 muscovite conventional K-Ar RM-9-63 "4.76E-04, 0.589E-04, 1.18E-04" 10.83 8.2 92 minimum age of intrusion 18373 1 64.6 2.5 biotite conventional K-Ar PED-22-59 "4.76E-04, 0.589E-04, 1.18E-04" 7.54 7.31 71 age of intrusion 18374 1 67.1 2.7 biotite conventional K-Ar PED-21-59 "4.76E-04, 0.589E-04, 1.18E-04" 6.67 6.72 65 age of intrusion 18375 1 67.1 2 biotite conventional K-Ar PED-3-63 "4.76E-04, 0.589E-04, 1.18E-04" 8.29 8.15 65 age of intrusion 18376 1 65.9 6.6 biotite conventional K-Ar PED-20-64 "4.76E-04, 0.589E-04, 1.18E-04" 9.17 9.07 33 age of intrusion 18377 1 70.9 2.3 biotite conventional K-Ar PED-17-64 "4.76E-04, 0.589E-04, 1.18E-04" 8.28 8.82 78 age of intrusion 18378 1 71.5 2.6 phlogopite conventional K-Ar RM-5-65 "4.76E-04, 0.589E-04, 1.18E-04" 9.28 9.96 71 age of intrusion 18379 1 62.4 2.3 plagioclase conventional K-Ar PED-4-64 "4.76E-04, 0.589E-04, 1.18E-04" 4.11 3.84 95 minimum age of intrusion Plagioclase and sericite 18380 1 71.1 3.2 biotite conventional K-Ar DEL-1-65 "4.76E-04, 0.589E-04, 1.18E-04" 8.51 9.1 40 age of intrusion 18381 1 1.95 0.2 whole rock conventional K-Ar P2 "4.72E-04, 0.585E-04, 1.19E-04" 1 0.0288 20 age of volcanism 18382 1 1.96 0.16 whole rock conventional K-Ar P3 "4.72E-04, 0.585E-04, 1.19E-04" 1.05 0.0304 47 age of volcanism 18383 1 1.86 0.17 whole rock conventional K-Ar P5 "4.72E-04, 0.585E-04, 1.19E-04" 1.02 0.0281 38 age of volcanism 18384 1 2.13 0.12 whole rock conventional K-Ar P10 "4.72E-04, 0.585E-04, 1.19E-04" 1.04 0.0327 45 age of volcanism 18385 1 1.77 0.14 whole rock conventional K-Ar P11-1 "4.72E-04, 0.585E-04, 1.19E-04" 1.1 0.0287 29 age of volcanism 18385 2 1.8 0.12 whole rock conventional K-Ar P11-2 "4.72E-04, 0.585E-04, 1.19E-04" 1.11 0.0295 age of volcanism 18386 1 2.06 0.16 whole rock conventional K-Ar P12 "4.72E-04, 0.585E-04, 1.19E-04" 1.09 0.0333 30 age of volcanism 18387 1 2.09 0.16 whole rock conventional K-Ar P13 "4.72E-04, 0.585E-04, 1.19E-04" 1.24 0.0383 36 age of volcanism 18388 1 2.14 0.16 whole rock conventional K-Ar P15 "4.72E-04, 0.585E-04, 1.19E-04" 1.24 0.0391 35 age of volcanism 18389 1 1.92 0.12 whole rock conventional K-Ar P19 "4.72E-04, 0.585E-04, 1.19E-04" 1.13 0.0321 39 age of volcanism 18390 1 1.81 0.14 whole rock conventional K-Ar P20 "4.72E-04, 0.585E-04, 1.19E-04" 1.1 0.0293 32 age of volcanism 18391 1 1.59 0.12 whole rock conventional K-Ar P21 "4.72E-04, 0.585E-04, 1.19E-04" 1.52 0.0359 32 age of volcanism 18392 1 0.1 0.2 whole rock conventional K-Ar P35 "4.72E-04, 0.585E-04, 1.19E-04" 1.58 0.0029 5 age of volcanism 18393 1 0.3 0.2 whole rock conventional K-Ar P38 "4.72E-04, 0.585E-04, 1.19E-04" 1.21 0.0057 8 age of volcanism 18394 1 0.03 0.2 whole rock conventional K-Ar P52 "4.72E-04, 0.585E-04, 1.19E-04" 1.16 0.0006 1 age of volcanism 18395 1 2.19 0.2 whole rock conventional K-Ar P66 "4.72E-04, 0.585E-04, 1.19E-04" 0.849 0.0275 32 age of volcanism 18396 1 2.1 0.12 whole rock conventional K-Ar P67 "4.72E-04, 0.585E-04, 1.19E-04" 0.977 0.0303 39 age of volcanism 18397 1 113 1.3 biotite conventional K-Ar Cl-1 "4.72E-04, 0.584E-04, 1.19E-04" 7.734 13.3 78 minimum age of intrusion 18397 2 121 3.2 hornblende conventional K-Ar Cl-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.892 1.647 83 age of intrusion 18397 3 105 2.9 plagioclase conventional K-Ar Cl-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.396 0.6305 39 minimum age of intrusion 18397 4 96 2.7 augite-ferroaugite conventional K-Ar Cl-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.057 0.0824 21 minimum age of intrusion 18397 5 48 1.4 hypersthene conventional K-Ar Cl-1 "4.72E-04, 0.584E-04, 1.19E-04" 0.054 0.0385 6 age meaning uncertain (geologic factors) 18398 1 90 2 biotite conventional K-Ar FD-13 "4.72E-04, 0.584E-04, 1.19E-04" 9.34 12.61 81 age of intrusion 18398 2 90 2.5 hornblende conventional K-Ar FD-13 "4.72E-04, 0.584E-04, 1.19E-04" 0.779 1.057 78 age of intrusion 18398 3 88 2 orthoclase conventional K-Ar FD-13 "4.72E-04, 0.584E-04, 1.19E-04" 14.09 18.62 98 minimum age of intrusion 18398 4 81 2.2 plagioclase conventional K-Ar FD-13 "4.72E-04, 0.584E-04, 1.19E-04" 0.322 0.395 31 minimum age of intrusion 18398 5 78 2.1 augite-ferroaugite conventional K-Ar FD-13 "4.72E-04, 0.584E-04, 1.19E-04" 0.06 0.07 27 minimum age of intrusion 18399 1 980 biotite conventional K-Ar 307-61 "4.72E-04, 0.585E-04, 1.19E-04" 9.18 174 age of intrusion 18400 1 1020 muscovite conventional K-Ar 306-61 "4.72E-04, 0.585E-04, 1.19E-04" 10.64 213.3 age of intrusion 18401 1 990 muscovite conventional K-Ar 309-61 "4.72E-04, 0.585E-04, 1.19E-04" 10.17 196.3 age of intrusion 18402 1 1000 muscovite conventional K-Ar 308-61 "4.72E-04, 0.585E-04, 1.19E-04" 10.7 208.8 age of intrusion 18405 1 1240 62 biotite conventional K-Ar C-1 B "4.72E-04, 0.585E-04, 1.22E-04" 9.38 241.3 85 age of metamorphic crystallization 18406 1 1205 60 biotite conventional K-Ar C-2 B "4.72E-04, 0.585E-04, 1.22E-04" 9.34 233.5 85 age of intrusion 18407 1 1230 62 biotite conventional K-Ar C-3 B "4.72E-04, 0.585E-04, 1.22E-04" 8.86 227.5 85 age of intrusion 18408 1 1335 67 biotite conventional K-Ar C-4 B "4.72E-04, 0.585E-04, 1.22E-04" 8.87 254.8 85 minimum age of intrusion 18409 1 1440 72 biotite conventional K-Ar C-5 B "4.72E-04, 0.585E-04, 1.22E-04" 8.59 274 85 minimum age of intrusion 18410 1 1360 68 biotite conventional K-Ar C-6 B "4.72E-04, 0.585E-04, 1.22E-04" 8.82 259.3 85 age of metamorphic crystallization 18411 1 69 3 biotite conventional K-Ar C-7 B "4.72E-04, 0.585E-04, 1.22E-04" 8.11 8.44 85 age of intrusion 18412 1 90 5 biotite conventional K-Ar C-8 B "4.72E-04, 0.585E-04, 1.22E-04" 9.46 12.94 85 age of later metamorphism 18413 1 1350 68 biotite conventional K-Ar C-9 B "4.72E-04, 0.585E-04, 1.22E-04" 8.75 255.3 85 age of metamorphic crystallization 18414 1 1240 62 biotite conventional K-Ar C-15 B "4.72E-04, 0.585E-04, 1.22E-04" 8.54 222.5 85 age of metamorphic crystallization 18414 2 2020 101 hornblende conventional K-Ar C-15 H "4.72E-04, 0.585E-04, 1.22E-04" 0.377 20.13 85 "sample contains excess radiogenic argon, age is too old" 18415 1 1255 63 biotite conventional K-Ar C-16 B "4.72E-04, 0.585E-04, 1.22E-04" 9.25 244.6 85 age of metamorphic crystallization 18416 1 1320 66 biotite conventional K-Ar C-17 B "4.72E-04, 0.585E-04, 1.22E-04" 7.7 218.3 85 age of metamorphic crystallization 18417 1 1335 67 muscovite conventional K-Ar C-18 M "4.72E-04, 0.585E-04, 1.22E-04" 10.68 306.6 85 age of later metamorphism 18418 1 1360 68 muscovite conventional K-Ar C-19 M "4.72E-04, 0.585E-04, 1.22E-04" 10.5 308.8 85 age of later metamorphism 18419 1 1200 60 biotite conventional K-Ar C-20 B "4.72E-04, 0.585E-04, 1.22E-04" 7.45 185.5 85 minimum age of intrusion 18419 2 1350 68 muscovite conventional K-Ar C-20 M "4.72E-04, 0.585E-04, 1.22E-04" 10.5 305 85 age of intrusion 18420 1 1175 59 biotite conventional K-Ar C-22 B "4.72E-04, 0.585E-04, 1.22E-04" 9.28 223.9 85 age of later metamorphism 18421 1 1200 60 biotite conventional K-Ar C-23 B "4.72E-04, 0.585E-04, 1.22E-04" 8.22 205.3 85 age of metamorphic crystallization 18421 2 1290 65 muscovite conventional K-Ar C-23 M "4.72E-04, 0.585E-04, 1.22E-04" 10.13 275.8 85 age of metamorphic crystallization 18422 1 326 16 whole rock conventional K-Ar C-24 R "4.72E-04, 0.585E-04, 1.22E-04" 3.13 16.5 85 age meaning uncertain (geologic factors) 18423 1 1300 65 biotite conventional K-Ar C-25 B "4.72E-04, 0.585E-04, 1.22E-04" 9.24 255.6 85 minimum age of intrusion 18429 1 106 3 biotite conventional K-Ar 66AMn-211 (1) "4.72E-04, 0.585E-04, 1.19E-04" 4.745 7.606 95 age of intrusion 18430 1 91.3 3 biotite conventional K-Ar 69Apa-219e (2) "4.72E-04, 0.585E-04, 1.19E-04" 7.98 11.02 87 age of intrusion 18431 1 101 3 biotite conventional K-Ar 70ACy-162 (3) "4.72E-04, 0.585E-04, 1.19E-04" 8.17 12.57 87 age of intrusion 18432 1 101.7 3.1 hornblende conventional K-Ar 66AMm-245 (4) "4.72E-04, 0.585E-04, 1.19E-04" 1.475 2.277 90 age of intrusion 18433 1 21.9 1.3 whole rock conventional K-Ar 1/2/1997 "4.72E-04, 0.584E-04, 1.19E-04" 1.63 0.5265 74 age of volcanism 18434 1 22 1.3 whole rock conventional K-Ar 1/3/1997 "4.72E-04, 0.584E-04, 1.19E-04" 1.9 0.6202 65 age of volcanism 18435 1 19.9 1.2 whole rock conventional K-Ar 1/4/1997 "4.72E-04, 0.584E-04, 1.19E-04" 1.24 0.3614 43 minimum age of volcanism 18436 1 17.5 1 whole rock conventional K-Ar 1/4/1998 "4.72E-04, 0.584E-04, 1.19E-04" 1.79 0.464 42 minimum age of volcanism 18437 1 21 1.2 whole rock conventional K-Ar 1/5/1997 "4.72E-04, 0.584E-04, 1.19E-04" 0.71 0.2231 43 age of volcanism 18438 1 22.3 1.3 whole rock conventional K-Ar 1/6/1997 "4.72E-04, 0.584E-04, 1.19E-04" 1.43 0.4774 45 age of volcanism 18439 1 20.6 1.2 whole rock conventional K-Ar 1/7/1997 "4.72E-04, 0.584E-04, 1.19E-04" 1.6 0.4908 40 age of volcanism 18440 1 24 1.4 whole rock conventional K-Ar 16A (1) "4.72E-04, 0.584E-04, 1.19E-04" 1.22 0.4328 61 age of volcanism 18440 2 25 1.5 whole rock conventional K-Ar 16A (2) "4.72E-04, 0.584E-04, 1.19E-04" 1.22 0.4551 54 age of volcanism 18441 1 23 2.3 whole rock conventional K-Ar 10A "4.72E-04, 0.584E-04, 1.19E-04" 0.35 0.1205 6 age of volcanism 18442 1 23 1.4 whole rock conventional K-Ar 8A "4.72E-04, 0.584E-04, 1.19E-04" 1.05 0.357 47 age of volcanism 18443 1 24.3 1.5 whole rock conventional K-Ar 4A "4.72E-04, 0.584E-04, 1.19E-04" 1.08 0.3927 29 age of volcanism 18444 1 255 10 whole rock conventional K-Ar KCC-1 (1) "4.72E-04, 0.585E-04, 1.19E-04" 1.43 5.759 73 age of volcanism 18445 1 73 3 whole rock conventional K-Ar KCO-2 (2) "4.72E-04, 0.585E-04, 1.19E-04" 0.744 0.8213 47 age of volcanism 18446 1 80 4 whole rock conventional K-Ar KCO-3 (3) "4.72E-04, 0.585E-04, 1.19E-04" 0.848 1.021 52 age of volcanism 18447 1 86 5 whole rock conventional K-Ar UCO-4 (4) "4.72E-04, 0.585E-04, 1.19E-04" 0.775 1.003 42 age of volcanism 18448 1 77 5 whole rock conventional K-Ar UCO-5 (5) "4.72E-04, 0.585E-04, 1.19E-04" 0.469 0.5492 43 age of volcanism 18449 1 79 5 whole rock conventional K-Ar UCO-6 (6-1) "4.72E-04, 0.585E-04, 1.19E-04" 0.949 1.126 40 age of volcanism 18449 2 78 3 whole rock conventional K-Ar UCO-6 (6-2) "4.72E-04, 0.585E-04, 1.19E-04" 0.949 1.11 23 age of volcanism 18450 1 73 3 whole rock conventional K-Ar UCO-7 (7) "4.72E-04, 0.585E-04, 1.19E-04" 0.835 0.9217 43 age of volcanism 18451 1 74 3 whole rock conventional K-Ar UCC-8 (8) "4.72E-04, 0.585E-04, 1.19E-04" 1.175 1.307 62 age of volcanism 18452 1 78 3 whole rock conventional K-Ar UCC-9 (9) "4.72E-04, 0.585E-04, 1.19E-04" 0.675 0.7882 52 age of volcanism 18453 1 71 3 whole rock conventional K-Ar UCC-10 (10) "4.72E-04, 0.585E-04, 1.19E-04" 1.75 1.871 61 age of volcanism 18454 1 63 2 whole rock conventional K-Ar UCO-11 (11) "4.72E-04, 0.585E-04, 1.19E-04" 3.9 3.668 74 minimum age of volcanism 18455 1 82 4 whole rock conventional K-Ar UCO-12 (12) "4.72E-04, 0.585E-04, 1.19E-04" 0.59 0.7294 57 age of volcanism 18456 1 63 2 whole rock conventional K-Ar UCO-13 (13) "4.72E-04, 0.585E-04, 1.19E-04" 4.67 4.379 66 minimum age of volcanism 18457 1 77 3 whole rock conventional K-Ar UCO-14 (14) "4.72E-04, 0.585E-04, 1.19E-04" 0.548 0.6363 42 age of volcanism 18458 1 74 3 whole rock conventional K-Ar UCO-15 (15-1) "4.72E-04, 0.585E-04, 1.19E-04" 1.08 1.21 68 age of volcanism 18458 2 75 3 whole rock conventional K-Ar UCO-15 (15-2) "4.72E-04, 0.585E-04, 1.19E-04" 1.125 1.27 66 age of volcanism 18459 1 82 4 whole rock conventional K-Ar UCO-16 (16) "4.72E-04, 0.585E-04, 1.19E-04" 0.766 0.954 68 age of volcanism 18460 1 76 3 whole rock conventional K-Ar UCO-17 (17) "4.72E-04, 0.585E-04, 1.19E-04" 1.119 1.273 77 age of volcanism 18461 1 84 4 whole rock conventional K-Ar UCO-18 (18) "4.72E-04, 0.585E-04, 1.19E-04" 0.935 1.196 68 age of volcanism 18462 1 75 4 whole rock conventional K-Ar FCC-19 (19) "4.72E-04, 0.585E-04, 1.19E-04" 0.532 0.6011 41 age of volcanism 18463 1 81 3 whole rock conventional K-Ar GCC-20 (20) "4.72E-04, 0.585E-04, 1.19E-04" 0.522 0.6372 39 age of volcanism 18464 1 81 4 whole rock conventional K-Ar TCO-21 (21-1) "4.72E-04, 0.585E-04, 1.19E-04" 0.67 0.8236 50 age of volcanism 18464 2 78 3 whole rock conventional K-Ar TCO-21 (21-2) "4.72E-04, 0.585E-04, 1.19E-04" 0.683 0.8108 51 age of volcanism 18465 1 100 4 whole rock conventional K-Ar MCO-22 (22-1) "4.72E-04, 0.585E-04, 1.19E-04" 3.5 5.287 78 age of intrusion 18465 2 101 4 whole rock conventional K-Ar MCO-22 (22-2) "4.72E-04, 0.585E-04, 1.19E-04" 3.5 5.403 70 age of intrusion 18466 1 197 8 whole rock conventional K-Ar HAC-23 (23) "4.72E-04, 0.585E-04, 1.19E-04" 1.3 3.978 74 age of intrusion 18467 1 196 8 whole rock conventional K-Ar MLC-24 (24) "4.72E-04, 0.585E-04, 1.19E-04" 1.05 3.2 59 age of intrusion 18474 1 22.6 1 biotite conventional K-Ar 8074 "4.78E-04, 0.588E-04, 1.21E-04" 8.94 2.99 52 age of volcanism 18475 1 21.3 0.8 biotite conventional K-Ar 8073 "4.78E-04, 0.588E-04, 1.21E-04" 8.93 2.82 21 age of volcanism 18476 1 17.8 3.1 whole rock conventional K-Ar 8062 "4.78E-04, 0.588E-04, 1.21E-04" 1.85 0.49 11 age of volcanism 18477 1 18.4 0.6 biotite conventional K-Ar AP-205 "4.78E-04, 0.588E-04, 1.21E-04" 8.76 2.388 56 age of volcanism 18478 1 16.3 0.5 sanidine conventional K-Ar AP-215 "4.78E-04, 0.588E-04, 1.21E-04" 8.5 2.05 80 age of volcanism 18479 1 88.7 3 biotite conventional K-Ar 69APa187b "4.72E-04, 0.585E-04, 1.19E-04" 5.97 8.009 76 age of volcanism 18480 1 62.8 1.9 sanidine conventional K-Ar 66APa242 "4.72E-04, 0.585E-04, 1.19E-04" 6.245 5.894 92 age of volcanism 18480 2 60.5 1.8 hornblende conventional K-Ar 66APa242 "4.72E-04, 0.585E-04, 1.19E-04" 0.972 0.8837 52 age of volcanism 18481 1 238 7 hornblende conventional K-Ar 69Apa229a "4.72E-04, 0.585E-04, 1.19E-04" 0.892 3.348 87 age of intrusion 18482 1 106 3 biotite conventional K-Ar 66Amn211 "4.72E-04, 0.585E-04, 1.19E-04" 4.745 7.606 95 age of intrusion 18499 1 790 70 whole rock conventional K-Ar Pruet and Hughes Company 1 "4.72E-04, 0.585E-04, 1.19E-04" 4.6 67.15 98 minimum age of intrusion 18500 1 810 15 biotite 39Ar-40Ar total fusion 6 "4.962E-04, 0.581E-04, 1.1167E-04" "minimum age of metamorphic crystallization, may denote delayed cooling" 18501 1 901 20 hornblende 39Ar-40Ar total fusion 7 "4.962E-04, 0.581E-04, 1.1167E-04" "minimum age of metamorphic crystallization, may denote delayed cooling" 18502 1 542 15 biotite 39Ar-40Ar total fusion 8 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism 18503 1 501 10 biotite 39Ar-40Ar total fusion 9 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism 18504 1 710 15 biotite 39Ar-40Ar total fusion 10 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism 18504 2 913 20 hornblende 39Ar-40Ar total fusion 10 "4.962E-04, 0.581E-04, 1.1167E-04" "minimum age of metamorphic crystallization, may denote delayed cooling" 18505 1 891 20 hornblende 39Ar-40Ar total fusion 11 "4.962E-04, 0.581E-04, 1.1167E-04" "minimum age of metamorphic crystallization, may denote delayed cooling" 18506 1 472 10 hornblende 39Ar-40Ar total fusion 12 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism 18507 1 393 10 biotite 39Ar-40Ar total fusion 13 "4.962E-04, 0.581E-04, 1.1167E-04" "age of later metamorphism, may denote delayed cooling" 18508 1 630 20 hornblende 39Ar-40Ar total fusion 14 "4.962E-04, 0.581E-04, 1.1167E-04" initial age disturbed by later metamorphism 18509 1 382 10 biotite 39Ar-40Ar total fusion 15 "4.962E-04, 0.581E-04, 1.1167E-04" "age of later metamorphism, may denote delayed cooling" 18510 1 423 10 hornblende 39Ar-40Ar total fusion 16 "4.962E-04, 0.581E-04, 1.1167E-04" age of later metamorphism 18511 1 443 10 hornblende 39Ar-40Ar total fusion 17 "4.962E-04, 0.581E-04, 1.1167E-04" age of later metamorphism 18512 1 75.6 2.3 muscovite conventional K-Ar BCHS-4 "4.962E-04, 0.581E-04, 1.1167E-04" 7.09 7.8785 86 age reset by thermal event Sample ages indicate faulting occurred between 79 and 85 Ma 18513 1 71.4 2.2 muscovite conventional K-Ar BCHS-6 "4.962E-04, 0.581E-04, 1.1167E-04" 8.94 9.3763 86 age reset by thermal event Sample ages indicate faulting occurred between 79 and 85 Ma 18514 1 78.5 0.7 muscovite 39Ar-40Ar incremental (plateau) ETF10430A "4.962E-04, 0.581E-04, 1.1167E-04" 93 age reset by thermal event Sample ages indicate faulting occurred between 79 and 85 Ma 18514 1 80 0.6 muscovite 39Ar-40Ar incremental (plateau) ETF10430B "4.962E-04, 0.581E-04, 1.1167E-04" 98 age reset by thermal event Sample ages indicate faulting occurred between 79 and 85 Ma 18515 1 78.9 0.9 muscovite 39Ar-40Ar incremental (plateau) ETF10440A "4.962E-04, 0.581E-04, 1.1167E-04" 97 age reset by thermal event Sample ages indicate faulting occurred between 79 and 85 Ma 18515 1 79.5 2 muscovite 39Ar-40Ar incremental (plateau) ETF10440B "4.962E-04, 0.581E-04, 1.1167E-04" 97 age reset by thermal event Sample ages indicate faulting occurred between 79 and 85 Ma 18612 1 114.1 0.1 biotite 39Ar-40Ar incremental (plateau) 11 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 9-step analysis 18613 1 137 0.5 biotite 39Ar-40Ar incremental (plateau) 12 "4.962E-04, 0.581E-04, 1.1167E-04" age of intrusion 10-step analysis 18614 1 144.2 0.9 biotite 39Ar-40Ar incremental (plateau) 13 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling 10-step analysis 18615 1 141.2 0.9 biotite 39Ar-40Ar incremental (plateau) 14 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling 10-step analysis Age interpreted as cooling through about 300 degrees C 18615 2 146.6 0.3 hornblende 39Ar-40Ar incremental (plateau) 14 "4.962E-04, 0.581E-04, 1.1167E-04" age of uplift and cooling 12-step analysis Age interpreted as cooling through about 500 +/- 50 degrees C 18616 1 141.1 1.1 hornblende 39Ar-40Ar incremental (plateau) 15 "4.962E-04, 0.581E-04, 1.1167E-04" age reset by thermal event 14-step analysis Age data indicate partially elevated temperature (about 500 deg. C) related to fault zone 18617 1 140.1 2.5 hornblende 39Ar-40Ar incremental (plateau) 16 "4.962E-04, 0.581E-04, 1.1167E-04" age meaning uncertain (geologic factors) 13-step analysis Age uncertain due to presence of trapped radiogenic argon 18618 1 2.13 whole rock conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 4.63 0.142 45 age of volcanism 18619 1 1.93 glass conventional K-Ar 2 "4.962E-04, 0.581E-04, 1.1167E-04" 4.39 0.122 48 age of volcanism 18620 1 1.92 glass conventional K-Ar 3 "4.962E-04, 0.581E-04, 1.1167E-04" 4.46 0.123 24 age of volcanism 18621 1 1.89 glass conventional K-Ar 4 "4.962E-04, 0.581E-04, 1.1167E-04" 4.78 0.13 64 age of volcanism 18622 1 1.82 glass conventional K-Ar 5 "4.962E-04, 0.581E-04, 1.1167E-04" 4.74 0.124 88 age of volcanism 18623 1 1.77 glass conventional K-Ar 6 "4.962E-04, 0.581E-04, 1.1167E-04" 4.74 0.121 71 age of volcanism 18624 1 1.75 glass conventional K-Ar 7 "4.962E-04, 0.581E-04, 1.1167E-04" 4.54 0.115 26 age of volcanism 18625 1 1.74 glass conventional K-Ar 8 "4.962E-04, 0.581E-04, 1.1167E-04" 4.43 0.111 34 age of volcanism 18626 1 1.63 glass conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 4.63 0.109 9 age of volcanism 18626 2 1.56 glass conventional K-Ar 9 "4.962E-04, 0.581E-04, 1.1167E-04" 4.48 0.104 7 age of volcanism 18627 1 1.6 glass conventional K-Ar 10 "4.962E-04, 0.581E-04, 1.1167E-04" 4.86 0.112 71 age of volcanism 18628 1 1.6 glass conventional K-Ar 11 "4.962E-04, 0.581E-04, 1.1167E-04" 4.76 0.109 11 age of volcanism 18629 1 1.59 glass conventional K-Ar 12 "4.962E-04, 0.581E-04, 1.1167E-04" 4.69 0.107 41 age of volcanism 18630 1 1.44 glass conventional K-Ar 13 "4.962E-04, 0.581E-04, 1.1167E-04" 4.64 0.0959 18 age of volcanism 18631 1 1.42 whole rock conventional K-Ar 14 "4.962E-04, 0.581E-04, 1.1167E-04" 4.36 0.0891 14 age of volcanism 18632 1 1.35 sanidine conventional K-Ar 15 "4.962E-04, 0.581E-04, 1.1167E-04" 5.89 0.115 10 age of volcanism 18633 1 1.33 whole rock conventional K-Ar 16 "4.962E-04, 0.581E-04, 1.1167E-04" 4.57 0.0877 10 age of volcanism 18634 1 1.2 whole rock conventional K-Ar 17 "4.962E-04, 0.581E-04, 1.1167E-04" 4.41 0.0765 54 age of volcanism 18635 1 1.1 whole rock conventional K-Ar 18 "4.962E-04, 0.581E-04, 1.1167E-04" 4.69 0.0744 19 age of volcanism 18636 1 1.06 glass conventional K-Ar 19 "4.962E-04, 0.581E-04, 1.1167E-04" 4.86 0.0744 11 age of volcanism 18637 1 1.06 whole rock conventional K-Ar 20 "4.962E-04, 0.581E-04, 1.1167E-04" 5.04 0.0771 26 age of volcanism 18638 1 1.04 glass conventional K-Ar 21 "4.962E-04, 0.581E-04, 1.1167E-04" 4.6 0.0687 4 age of volcanism 18639 1 1 glass conventional K-Ar 22 "4.962E-04, 0.581E-04, 1.1167E-04" 4.75 0.0686 27 age of volcanism 18640 1 0.98 whole rock conventional K-Ar 23 "4.962E-04, 0.581E-04, 1.1167E-04" 4.57 0.0647 33 age of volcanism 18641 1 0.98 glass conventional K-Ar 24 "4.962E-04, 0.581E-04, 1.1167E-04" 4.89 0.0681 66 age of volcanism 18642 1 0.97 glass conventional K-Ar 25 "4.962E-04, 0.581E-04, 1.1167E-04" 4.84 0.0674 51 age of volcanism 18643 1 0.96 glass conventional K-Ar 26 "4.962E-04, 0.581E-04, 1.1167E-04" 4.92 0.0681 54 age of volcanism 18644 1 0.94 glass conventional K-Ar 27 "4.962E-04, 0.581E-04, 1.1167E-04" 4.84 0.0653 40 age of volcanism 18645 1 0.92 glass conventional K-Ar 28 "4.962E-04, 0.581E-04, 1.1167E-04" 4.83 0.0643 63 age of volcanism 18646 1 0.92 glass conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 4.94 0.0653 21 age of volcanism 18646 2 0.88 glass conventional K-Ar 29 "4.962E-04, 0.581E-04, 1.1167E-04" 4.94 0.0626 24 age of volcanism 18647 1 0.92 whole rock conventional K-Ar 30 "4.962E-04, 0.581E-04, 1.1167E-04" 5.34 0.0693 16 age of volcanism 18648 1 0.91 glass conventional K-Ar 31 "4.962E-04, 0.581E-04, 1.1167E-04" 4.83 0.0631 20 age of volcanism 18649 1 0.82 glass conventional K-Ar 32 "4.962E-04, 0.581E-04, 1.1167E-04" 4.82 0.0568 10 age of volcanism 18650 1 0.81 whole rock conventional K-Ar 33 "4.962E-04, 0.581E-04, 1.1167E-04" 4.77 0.0557 37 age of volcanism 18651 1 0.81 glass conventional K-Ar 34 "4.962E-04, 0.581E-04, 1.1167E-04" 4.88 0.0569 40 age of volcanism 18651 2 0.8 glass conventional K-Ar 34 "4.962E-04, 0.581E-04, 1.1167E-04" 4.88 0.0566 35 age of volcanism 18652 1 0.79 glass conventional K-Ar 35 "4.962E-04, 0.581E-04, 1.1167E-04" 5 0.0566 42 age of volcanism 18666 1 15.7 0.6 sanidine conventional K-Ar 1 "4.962E-04, 0.581E-04, 1.1167E-04" 6.27 1.71 85 age of volcanism