RecNo FTRecNo FTAge FTErr FTMin FTLabNo FTDecCon TrackDens FossTrack InduDens InduTrack RatioTrack NeutFlux FT_U_ppm AddRef FTAgeCom FTSampCom FTAnalCom FTOthCom 8 1 1.9 0.25 zircon 65W40 6.85E-09 66 1380 0.0239 1.3 age of volcanism 9 1 0.6 0.15 zircon 9YC490 6.85E-09 20 1045 0.0096 1.3 age of volcanism 77 1 170 apatite WYLL-2 not given age of uplift and cooling ANALYTICAL DATA NOT GIVEN 885 1 0.7 0.2 zircon 50-61A 6.85E-09 11 660 0.0083 1.3 minimum age of volcanism 3 ZIRCON GRAINS 886 1 0.6 0.07 zircon 72G98 6.85E-09 66 2732 0.0102 0.924 minimum age of volcanism 8 ZIRCON GRAINS 887 1 0.7 0.35 zircon 68W104 6.85E-09 3 165 0.0091 1.26 minimum age of volcanism 2 ZIRCON GRAINS 888 1 0.9 0.25 zircon 70W63 6.85E-09 14 624 0.0113 1.26 minimum age of volcanism 5 ZIRCON GRAINS 889 1 1.7 0.17 zircon 71G2A 6.85E-09 97 1650 0.0293 0.924 minimum age of volcanism 7 ZIRCON GRAINS 890 1 1.9 0.2 zircon 71G1A 6.85E-09 86 1384 0.0311 1.01 minimum age of volcanism 6 ZIRCON GRAINS 891 1 1.8 0.25 zircon 66W39 6.85E-09 49 1074 0.0228 1.3 minimum age of volcanism 4 ZIRCON GRAINS 892 1 2 0.25 zircon 71G3 6.85E-09 61 1155 0.0264 1.26 minimum age of volcanism 9 ZIRCON GRAINS 893 1 1.8 0.25 zircon 68W100 6.85E-09 58 1258 0.023 1.26 minimum age of volcanism 8 ZIRCON GRAINS 894 1 2.6 0.25 zircon 71G2B 6.85E-09 107 1601 0.0333 1.26 minimum age of volcanism 8 ZIRCON GRAINS 895 1 1.8 0.2 zircon 71G1B 6.85E-09 77 1676 0.023 1.26 minimum age of volcanism 6 ZIRCON GRAINS 1210 1 170 13 sphene 97VV-368 6.85E-09 12.2 1396 5.38 308 1.24 Edwards and McLaughlin (1972) age of intrusion 6 GRAINS USED IN FISSION-TRACK COUNTING "K-AR AGE OF 147+/-3 M.Y. REPORTED FOR THIS SAMPLE BYASHLEY AND SILBERMAN, 1976" 1210 2 19.6 2.7 apatite 97VV-368 6.85E-09 0.152 1.4 2.96 50 GRAINS USED IN FISSION-TRACK COUNTING "AGE INDICATES TIME OF HYDROTHERMAL ACTIVITY ; K-AR AGE OF 147+/-3 M.Y. REPORTED FOR THIS SAMPLE BY ASHLEY AND SILBERMAN, 1976" 1211 1 33 2 zircon 199-137 6.85E-09 7.75 855 42.4 1394 2.96 age of volcanism 7 GRAINS USED IN FISSION-TRACK COUNTING 1212 1 31.1 2.2 zircon 222-36 6.85E-09 1.61 604 3.94 738 1.24 age of volcanism 7 GRAINS USED IN FISSION-TRACK COUNTING "K-AR AGE OF 24.4+/-0.5 M.Y. REPORTED FOR THIS SAMPLE IN ASHLEY AND SILBERMAN, 1976, AND K-AR AGE OF 21.2+/-0.4 M.Y. REPORTED BY SILBERMAN AND ASHLEY, 1970" 1212 2 27.7 3.3 apatite 222-36 6.85E-09 0.0556 0.363 2.96 minimum age of volcanism 50 GRAINS USED IN FISSION-TRACK COUNTING "K-AR AGE OF 24.4+/-0.5 M.Y. REPORTED FOR THIS SAMPLE IN ASHLEY AND SILBERMAN, 1976, AND K-AR AGE OF 21.2+/-0.4 M.Y. REPORTED BY SILBERMAN AND ASHLEY, 1970" 1213 1 21.2 2.4 apatite 201-116 6.85E-09 0.0488 0.418 2.96 51 GRAINS USED TO DETERMINE FOSSIL-TRACK-COUNT DENSITY; 17 GRAINS USED TO DETERMINE INDUCED-TRACK-COUNT DENSITY AGE INDICATES TIME OF HYDROTHERMAL ACTIVITY 1214 1 33.5 4.5 apatite 185-115 6.85E-09 0.0738 86 0.398 232 2.96 age of volcanism 6 GRAINS USED IN FISSION-TRACK COUNTING "FISSION-TRACK AGE OF 33.6+/-2.4 M.Y. ON ZIRCON REPORTED FOR THIS SAMPLE BY ASHLEY AND SILBERMAN, 1976" 1215 1 31.1 3.5 apatite 197-51-2 6.85E-09 0.0705 0.411 2.96 age of volcanism 50 GRAINS USED IN FISSION-TRACK COUNTING "FISSION-TRACK AGE OF 33.2+/-2.6 M.Y. ON ZIRCON REPORTED FOR THIS SAMPLE BY ASHLEY AND SILBERMAN, 1976" 1216 1 20.5 1.6 apatite Y-47 6.85E-09 0.0937 0.763 2.72 Silberman and Ashley (1970) 100 GRAINS USED TO DETERMINE FOSSIL-TRACK DENSITY; 50 GRAINS USED TO DETERMINE INDUCED-TRACK DENSITY 1217 1 19.8 1.4 sphene 203-11 6.85E-09 0.387 388 3.56 1861 2.96 Silberman and Ashley (1970) age of volcanism 8 GRAINS USED IN FISSION-TRACK COUNTING "FISSION-TRACK AGE OF 23.2 +/- 1.6 M.Y. ON ZIRCON REPORTED FOR THIS SAMPLE BY ASHLEY AND SILBERMAN, 1976" 1217 2 20.1 2 apatite 203-11 6.85E-09 0.0959 0.867 2.96 Silberman and Ashley (1970) age of volcanism 52 GRAINS USED TO DETERMINE FOSSIL-TRACK DENSITY; 51 GRAINS USED TO DETERMINE INDUCED-TRACK DENSITY "FISSION-TRACK AGE OF 23.2 +/- 1.6 M.Y. ON ZIRCON REPORTED FOR THIS SAMPLE BY ASHLEY AND SILBERMAN, 1976" 1319 1 47.6 1.9 apatite (NOT GIVEN) not given "minimum age of volcanism, may denote delayed cooling" NO ANALYTICAL DATA GIVEN 1321 1 40.5 2.6 apatite (NOT GIVEN) not given "minimum age of volcanism, may denote delayed cooling" NO ANALYTICAL DATA GIVEN 1322 1 38.8 1.6 apatite (NOT GIVEN) 6.85E-09 "minimum age of volcanism, may denote delayed cooling" NO ANALYTICAL DATA GIVEN 2050 1 407 41 apatite 1 6.85E-09 0.595 500 0.664 558 7.66 age of intrusion SAMPLE NUMBER 3079 BIOTITE K-AR AGE DETERMINED BY ZARTMAN AND OTHERS (1970) AS 404 M.Y. AND WHOLE-ROCK RB-SR AGE DETERMINED BY SPOONER AND FAIRBAIRN (1970) AS 400 M.Y. 2050 2 150 27 sphene 1 6.85E-09 0.142 264 4.73 399 7.66 SAMPLE NUMBER 3079 AGE IS ANOMALOUSLY LOW 2051 1 420 40 apatite 2 6.85E-09 0.3 311 0.322 572 7.66 age of intrusion SAMPLE NUMBER 3078 2053 1 223 22 apatite 4 6.85E-09 2.01 461 4.16 953 7.66 age of uplift and cooling SAMPLE NUMBER 3085 BIOTITE K-AR AGE DETERMINED BY FAUL AND OTHERS (1963) AS 354 M.Y. AND WHOLE-ROCK RB-SR AGE DETERMINED BY BROOKINS AND SPOONER (1970) AS 357 +/- 1 M.Y. 2053 2 366 18 sphene 4 6.85E-09 11.6 1779 14.4 1082 7.66 age of intrusion SAMPLE NUMBER 3085 2054 1 357 24 sphene 5 6.85E-09 5.86 1417 2.53 911 7.66 age of intrusion SAMPLE NUMBER ME-153 BIOTITE K-AR AGE DETERMINED BY FAUL AND OTHERS (1963) AS 355 M.Y. AND WHOLE-ROCK AGE DETERMINED BY BROOKINS AND SPOONER (1970) AS 341+/- 21 M.Y. 2055 1 222 22 apatite 6 6.85E-09 2.39 657 4.98 1368 7.66 age of uplift and cooling SAMPLE NUMBER 3059 BIOTITE K-AR AGE DETERMINED BY ZARTMAN AND OTHERS (1970) AS 277 +/- 8 M.Y. 2056 1 261 26 apatite 7 6.85E-09 0.655 1376 1.16 1943 7.66 age of uplift and cooling SAMPLE NUMBER 3058 "BIOTITE K-AR AGE IS 367 +/- 11 M.Y. (ZARTMAN AND OTHERS, 1970)" 2056 2 364 21 sphene 7 6.85E-09 16.6 1809 20.9 1145 7.66 age of intrusion SAMPLE NUMBER 3058 2057 1 207 21 apatite 8 6.85E-09 2.19 2044 4.9 1831 7.66 age of uplift and cooling SAMPLE NUMBER 3057 "MUSCOVITE K-AR AGE IS 295 +/- 9 M.Y. (ZARTMAN AND OTHERS, 1970)" 2058 1 219 22 apatite 9 6.85E-09 1.35 1264 2.85 2666 7.66 age of uplift and cooling SAMPLE NUMBER 3055 "BIOTITE K-AR AGE IS 260 +/- 8 M.Y. (ZARTMAN AND OTHERS, 1970)" 2059 1 150 15 apatite 10 6.85E-09 1.51 1408 4.58 1714 7.66 age of uplift and cooling SAMPLE NUMBER 3056 "BIOTITE K-AR AGE IS 247 +/- 8 M.Y. (ZARTMAN AND OTHERS, 1970)" 2060 1 133 1 apatite ME/G-1 6.85E-09 0.912 1120 0.64 816 1.54 age of intrusion 2060 2 119 13 apatite ME/G-1 6.85E-09 0.961 2087 0.752 1588 1.54 minimum age of intrusion 2061 1 117 15 apatite ME/Y-1 6.85E-09 0.501 406 0.398 549 1.54 minimum age of intrusion 2062 1 126 15 apatite ME/Y-2 6.85E-09 0.552 1000 0.413 794 1.54 age of intrusion 2063 1 116 14 apatite ME/Y-3 6.85E-09 0.707 794 0.566 974 1.54 minimum age of intrusion 2064 1 172 22 apatite ME/Y-4 6.85E-09 0.743 882 0.401 474 1.54 minimum age of intrusion HOEFS (1967) OBTAINED A 227 +/- 3 M.Y. WHOLE-ROCK RB-SR ISOCHRON AGE FOR THE AGAMENTICUS COMPLEX 2065 1 116 14 apatite ME/Y-6 6.85E-09 0.394 456 0.316 388 1.54 age of uplift and cooling HOEFS (1967) OBTAINED A 227 +/- 3 M.Y. WHOLE-ROCK RB-SR ISOCHRON AGE FOR THE AGAMENTICUS COMPLEX 2066 1 103 13 apatite ME/Y-8 6.85E-09 0.541 527 0.499 536 1.54 minimum age of intrusion 2067 1 119 15 apatite ME/N-1 6.85E-09 0.727 558 0.571 579 1.54 minimum age of intrusion 2068 1 177 22 apatite ME/KF-1 6.85E-09 0.475 558 0.249 579 1.54 minimum age of intrusion 2069 1 143 18 apatite ME/KF-2 6.85E-09 0.826 427 0.538 765 1.54 may denote delayed cooling 2391 1 8.5 1 apatite LSH-1 6.85E-09 age of uplift and cooling 2391 2 24.5 0.6 zircon LSH-1 6.85E-09 minimum age of intrusion AVERAGE OF 3 AGE-DETERMINATIONS 2391 3 24.1 0.6 sphene LSH-1 6.85E-09 minimum age of intrusion AVERAGE OF 6 AGE-DETERMINATIONS 2395 1 35.6 3.6 apatite LSH-2 6.85E-09 age of intrusion 2395 2 33.7 0.9 zircon LSH-2 6.85E-09 age of intrusion AVERAGE OF 3 AGE-DETERMINATIONS 2395 3 32.7 0.9 sphene LSH-2 6.85E-09 age of intrusion AVERAGE OF 6 AGE-DETERMINATIONS 2399 1 41.2 3 apatite LSH-3 6.85E-09 age of intrusion AVERAGE OF 8 AGE-DETERMINATIONS 2399 2 40.9 2.2 zircon LSH-3 6.85E-09 age of intrusion AVERAGE OF 3 AGE-DETERMINATIONS 2863 1 29.3 2.8 zircon WTR-SB2 6.85E-09 4.96 838 10.15 858 0.98 315 age of volcanism SIX GRAINS 2864 1 32.1 3 zircon 75-SB-8 6.85E-09 2.72 528 4.04 393 0.78 160 age of volcanism SIX GRAINS 2865 1 32.4 2.6 zircon 75-SB-9C 6.85E-09 4.52 1192 9.36 1235 1.1 260 age of volcanism SIX GRAINS 2886 1 1760 300 zircon FT. D-1 6.85E-09 "material inherited from source rock, maximum age for unit" DETRITAL; ROUNDED; OCCUR IN HEAVY-MINERAL LAYERS 2886 2 2060 400 zircon FT. D-1 6.85E-09 "material inherited from source rock, maximum age for unit" DETRITAL; ROUNDED; OCCUR IN HEAVY-MINERAL LAYERS 2887 1 85 9 apatite HP-5 6.85E-09 age of uplift and cooling 2887 2 1375 22 sphene HP-5 6.85E-09 minimum age of intrusion AVERAGE OF 3 AGES 2888 1 73 7 apatite Z-3 6.85E-09 age of uplift and cooling 2888 2 1320 75 sphene Z-3 6.85E-09 minimum age of intrusion AVERAGE OF 4 AGES 2889 1 31.9 3.2 apatite BP-2 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2890 1 29.7 3 apatite BP-5 6.85E-09 AVERAGE OF 7 AGES AGE OF KIMBERLITE EMPLACEMENT 2890 2 210 22 sphene BP-5 6.85E-09 PARTIALLY ANNEALED IN DEEP CRUST 2890 3 230 25 sphene BP-5 6.85E-09 PARTIALLY ANNEALED IN DEEP CRUST 2890 4 154 11 zircon BP-5 6.85E-09 AVERAGE OF 5 AGES PARTIALLY ANNEALED IN DEEP CRUST 2891 1 33.7 4 apatite GR-2 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2891 2 32.2 2.6 zircon GR-2 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2892 1 33.7 4 apatite GR-3 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2892 2 620 70 sphene GR-3 6.85E-09 PARTIALLY ANNEALED IN INTERMEDIATE CRUST 2893 1 29.7 3 apatite GR-4 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2893 2 375 40 sphene GR-4 6.85E-09 PARTIALLY ANNEALED IN INTERMEDIATE CRUST 2893 3 690 80 zircon GR-4 6.85E-09 PARTIALLY ANNEALED IN INTERMEDIATE CRUST 2894 1 30 3 apatite MT. R-1 6.85E-09 AGE OF MINETTE EMPLACEMENT 2894 2 35.5 3.1 zircon MT. R-1 6.85E-09 AGE OF MINETTE EMPLACEMENT 2895 1 32.5 3 apatite MT. R-3 6.85E-09 age of intrusion 2896 1 35 4 apatite MR-2 6.85E-09 NEAR AGE OF KIMBERLITE EMPLACEMENT 2897 1 28 3 apatite 68-18 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2897 2 690 100 sphene 68-18 6.85E-09 PARTIALLY ANNEALED IN CRUST 2898 1 30.3 2.7 apatite 68-19 6.85E-09 AGE OF KIMBERLITE EMPLACEMENT 2899 1 27 3 apatite SR-6 6.85E-09 Armstrong (1969) age of intrusion 2900 1 32 3 apatite SR-7 6.85E-09 Armstrong (1969) NO ANALYTICAL DATA GIVEN MAXIMUM AGE OF MINETTE EMPLACEMENT 2901 1 5.5 1.1 apatite HB-1 6.85E-09 NO ANALYTICAL DATA GIVEN AGE OF MONCHIQUITE EMPLACEMENT 2902 1 2.1 0.2 sphene HB-2 6.85E-09 NO ANALYTICAL DATA GIVEN; AVERAGE OF 3 AGES MINIMUM AGE OF MONCHIQUITE EMPLACEMENT 2945 1 57.9 5.2 zircon 73N1 6.85E-09 8.31 1385 9.2 767 1.05 260 age of intrusion 2945 2 47.5 5 apatite 73N1 6.85E-09 0.0466 97 0.0994 207 1.66 1.8 FISSION-TRACKS PARTIALLY ANNEALED BY TERTIARY FAULTING 2946 1 60.2 4.9 zircon USGS(D)-73N2 6.85E-09 8.11 1765 8.55 930 1.04 240 age of intrusion 2946 2 33.6 6 apatite USGS(D)-73N2 6.85E-09 0.0235 49 0.0706 147 1.65 1.3 age of uplift and cooling 2947 1 56.4 5 zircon 73N3 6.85E-09 6.7 1396 7.47 778 1.03 210 age of intrusion 2947 2 58 5 apatite 73N3 6.85E-09 0.0653 136 0.114 1.65 2 age of intrusion 2948 1 54 5.8 zircon 73N4 6.85E-09 5.74 1436 6.55 819 1.01 190 age of intrusion 2948 2 58 9 apatite 73N4 6.85E-09 0.0355 74 0.061 127 1.64 1.1 age of intrusion 2949 1 53.6 5.2 zircon 73N5 6.85E-09 5.73 1193 6.53 680 1 190 age of intrusion "PROBABLY SAME DIKE DATED BY BOLE (1971, M.S. THESIS, OHIO STATE UNIV.)--K-AR HORNBLENDE AGE = 54.6+/-1.1 M.Y." 2949 2 56 6 apatite 73N5 6.85E-09 0.0557 116 0.0994 207 1.64 1.8 age of intrusion 2950 1 57.2 6 zircon 5-43(DF-826) 6.85E-09 6.8 1071 7.04 554 0.97 220 age of intrusion 2951 1 58.7 5.8 zircon 5-44(DF-828) 6.85E-09 6.99 1229 7.01 617 0.965 220 age of intrusion 2952 1 33.3 6.7 zircon 5-39A(DF-829) 6.85E-09 15.6 217 27.5 191 0.96 870 age of intrusion 2953 1 36 4 apatite 73N6 6.85E-09 0.162 337 0.445 927 1.63 8.1 maximum age of intrusion AGE OF BRECCIA PIPE EMPLACEMENT 2954 1 12.7 1.8 zircon 75T1 6.85E-09 234 1260 0.19 1.091 age of volcanism 2955 1 10.8 1.6 zircon 72027 6.85E-09 207 1356 0.153 1.15 age of volcanism 2956 1 5.2 1 zircon 75C2 6.85E-09 144 944 0.153 0.558 age of volcanism 2957 1 5.6 0.9 zircon 75C1 6.85E-09 182 1114 0.16 0.558 age of volcanism 2958 1 2.9 0.5 zircon 72P2 6.85E-09 144 1680 0.086 0.558 age of volcanism 2959 1 2.7 0.4 zircon 73A2 6.85E-09 131 2782 0.047 0.927 age of volcanism 3282 1 37.7 3.9 zircon 11 6.85E-09 1.03 293 2.28 250 1.36 age of volcanism 3282 2 34.5 2.8 zircon 11 6.85E-09 4.34 385 10.48 466 1.36 age of volcanism 3282 3 35.1 3.3 zircon 11 6.85E-09 3.64 272 8.64 343 1.36 age of volcanism 3282 4 30.8 3.3 zircon 11 6.85E-09 3.03 170 8.7 244 1.44 age of volcanism 3282 5 32.4 3.7 zircon 11 6.85E-09 3.91 146 10.64 199 1.44 age of volcanism 3283 1 23.8 2.4 zircon 3 6.85E-09 5.72 203 19.2 308 1.3 age of volcanism AVERAGE OF 10 ZIRCON AND SPHENE FISSION-TRACK AGES IS 24.0 M.Y. FOR THE BATES MOUNTAIN TUFF. 3283 2 25.7 2.3 zircon 3 6.85E-09 6.78 280 21 434 1.3 age of volcanism 3283 3 24.1 2.2 zircon 3 6.85E-09 6.71 277 22.2 458 1.3 age of volcanism 3283 4 25.8 2.4 zircon 3 6.85E-09 6.11 252 20.2 416 1.36 age of volcanism 3283 5 25.7 2.4 zircon 3 6.85E-09 6.28 230 20.4 422 1.36 age of volcanism 3284 1 23.4 2.2 zircon 3 6.85E-09 6.4 220 22.8 391 1.36 age of volcanism AVERAGE OF 10 ZIRCON AND SPHENE FISSION-TRACK AGES IS 24.0 M.Y. FOR THE BATES MOUNTAIN TUFF. 3284 2 23.3 2.3 zircon 3 6.85E-09 6.2 256 22.2 459 1.36 age of volcanism 3284 3 21.1 2.3 sphene 3 6.85E-09 1.02 143 3.86 334 1.3 age of volcanism 3284 4 26.4 2.7 sphene 3 6.85E-09 1.55 195 4.68 284 1.3 age of volcanism 3284 5 21.9 1.9 sphene 3 6.85E-09 1.25 303 4.54 552 1.3 age of volcanism 3285 1 23.8 2.4 zircon 5 6.85E-09 2.7 139 9.04 317 1.3 age of volcanism AVERAGE OF 4 ZIRCON AGES IS 23.9 M.Y.; AVERAGE OF 6 ZIRCON FISSION-TRACK AGES IS 24.4 M.Y. FOR THE FISH CREEK MOUNTAINS TUFF. 3285 2 27 2.4 zircon 5 6.85E-09 2.38 280 7.04 428 1.3 age of volcanism 3285 3 23.3 2 zircon 5 6.85E-09 4.52 317 15.44 340 1.3 age of volcanism 3285 4 21.5 2.4 zircon 5 6.85E-09 4.28 177 15.9 328 1.3 age of volcanism 3286 1 24.6 2.4 zircon 4 6.85E-09 6.86 283 22.2 458 1.3 age of volcanism AVERAGE OF 2 ZIRCON AGES IS 25.5 M.Y.; AVERAGE OF 6 ZIRCON FISSION-TRACK AGES IS 24.4 M.Y. 3286 2 26.5 2.6 zircon 4 6.85E-09 5.89 243 17.8 367 1.3 age of volcanism 3287 1 29.2 2.7 zircon 9 6.85E-09 8.2 338 22.4 462 1.3 age of volcanism AVERAGE OF 3 ZIRCON AGES IS 31.8 M.Y. 3287 2 30.4 3.5 zircon 9 6.85E-09 10.3 189 27 247 1.3 age of volcanism 3287 3 35.4 4.3 zircon 9 6.85E-09 9.07 187 20.4 210 1.3 age of volcanism 3288 1 33.2 4.9 zircon 8 6.85E-09 2.62 102 6.3 119 1.3 age of volcanism AVERAGE OF 5 ZIRCON AGES IS 30.6 M.Y. 3288 2 30.7 3.1 zircon 8 6.85E-09 5.39 222 14.02 289 1.3 age of volcanism 3288 3 31.2 4.1 zircon 8 6.85E-09 2.79 133 7.12 163 1.3 age of volcanism 3288 4 25.2 3.3 zircon 8 6.85E-09 2.36 111 7.45 175 1.3 age of volcanism 3288 5 32.8 3.3 zircon 8 6.85E-09 3.25 223 7.9 272 1.3 age of volcanism 3289 1 22.4 8 apatite 2 6.85E-09 0.103 13 0.386 36 1.37 age of volcanism AVERAGES OF 7 APATITE AGES IS 33.0 M.Y.; AVERAGE OF 20 ZIRCON AND APATITE FISSION-TRACK AGES IS 34.9 M.Y. FOR THE CAETANO TUFF. 3289 2 30.6 7 apatite 2 6.85E-09 0.413 29 1.034 87 1.37 age of volcanism 3289 3 35.8 20 apatite 2 6.85E-09 0.075 6 0.176 13 1.37 age of volcanism 3289 4 41.3 12 apatite 2 6.85E-09 0.122 25 0.248 47 1.37 age of volcanism 3289 5 25.9 9 apatite 2 6.85E-09 0.053 13 0.162 34 1.37 age of volcanism 3290 1 34.3 6.5 apatite 2 6.85E-09 0.332 62 0.614 131 1.37 age of volcanism AVERAGE OF 7 APATITE AGES IS 33.0 M.Y.; AVERAGE OF 20 ZIRCON AND APATITE FISSION-TRACK AGES IS 34.9 M.Y. FOR THE CAETANO TUFF. 3290 2 40.9 6.1 apatite 2 6.85E-09 0.263 97 0.54 199 1.37 age of volcanism 3291 1 27.4 3 zircon 10 6.85E-09 2.95 211 9.98 233 1.51 age of volcanism AVERAGE OF 4 ZIRCON AGES IS 35.5 M.Y.; AVERAGE OF 20 ZIRCON AND APATITE FISSION-TRACK AGES IS 34.9 M.Y. FOR THE CAETANO TUFF. 3291 2 34.6 4 zircon 10 6.85E-09 2.95 138 7.1 166 1.36 age of volcanism 3291 3 40.3 4 zircon 10 6.85E-09 1.97 259 4.08 267 1.36 age of volcanism 3291 4 39.7 4.8 zircon 10 6.85E-09 2.95 138 6.2 145 1.36 age of volcanism 3292 1 34.9 3.8 zircon 12 6.85E-09 2.87 201 6.86 257 1.36 age of volcanism AVERAGE OF 4 ZIRCON AGES IS 38.4 M.Y.; AVERAGE OF 20 ZIRCON AND APATITE FISSION-TRACK AGES IS 34.9 M.Y. FOR THE CAETANO TUFF. 3292 2 43.9 5.1 zircon 12 6.85E-09 3.39 269 6.82 191 1.44 age of volcanism 3292 3 38 4.4 zircon 12 6.85E-09 3.96 185 9.2 215 1.44 age of volcanism 3292 4 36.7 1.44 zircon 12 6.85E-09 4.49 105 10.8 101 age of volcanism 3396 1 134 14 apatite W-305 6.85E-09 0.364 765 0.242 508 minimum age of intrusion 3490 1 24.6 1.3 zircon 3 6.83E-09 age of volcanism NO ANALYTICAL DATA GIVEN 3606 1 29.9 1 zircon (NOT GIVEN) 6.85E-09 7.2 18.6 1.28 age of volcanism 5 GRAINS COUNTED 3611 1 272 53 zircon (NOT GIVEN) 6.85E-09 93 40 3.53 1.28 AVERAGE OF 4 FISSION-TRACK AGES IS 225+/-30 M.Y. WHICH IS TAKEN AS THE AGE OF THIS TUFF 3611 2 231 35 zircon (NOT GIVEN) 6.85E-09 182 63 2.93 1.28 3611 3 209 40 zircon (NOT GIVEN) 6.85E-09 179 34 2.69 1.28 3611 4 190 43 zircon (NOT GIVEN) 6.85E-09 120 24 2.42 1.28 3775 1 23 2 glass 26 not given minimum age of volcanism 3788 1 34.1 Unk (NOT GIVEN) not given age of volcanism 3789 1 33 Unk (NOT GIVEN) not given age of volcanism 3818 1 9.5 1.9 zircon (NOT GIVEN) 6.85E-09 age of volcanism 3836 1 93 6 apatite (NOT GIVEN) 6.85E-09 0.53 0.44 1.28 age of intrusion 3887 1 40 4 sphene 2A 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3887 2 40 10 epidote 2A 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3889 1 36 4 zircon 4 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3889 2 45 4 sphene 4 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3889 3 40 4 sphene 4 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3890 1 116 4 sphene 8 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3890 2 116 12 apatite 8 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3890 3 107 18 zircon 8 6.85E-09 age of intrusion NO ANALYTICAL DATA GIVEN 3896 1 33.6 2.4 zircon 185-115 6.85E-09 2.4 610 4.89 753 1.12 age of volcanism 7 GRAINS FISSION-TRACK AGE OF 33.5 +/- 4.5 ON APATITE REPORTED FOR THIS SAMPLE BY ASHLEY (1973) 3897 1 33.2 2.6 zircon 197-51-2 6.85E-09 1.01 462 2.08 537 1.12 age of volcanism 8 GRAINS FISSION-TRACK AGE OF 31.1 +/- 3.5 ON APATITE REPORTED FOR THIS SAMPLE BY ASHLEY (1973) 3898 1 28.6 3.2 zircon 199-13 6.85E-09 2.05 163 4.77 200 1.09 age of volcanism 4 GRAINS 3899 1 23.2 1.6 zircon 203-11 6.85E-09 1.91 451 5.5 994 1.09 age of volcanism 7 GRAINS "FISSION-TRACK AGES ON SPHENE AND APATITE OF 19.8 +/- 1.4 AND 20.1 +/- 2.0 ARE REPORTED FOR THIS SAMPLE BY ASHLEY, 1973; K-AR AGE OF 21.4 +/- 0.4 FOR THIS SAMPLE BY SILBERMAN AND ASHLEY, 1970" 3900 1 22.2 1.4 zircon 187-81 6.85E-09 2.1 725 6.49 1213 1.12 age of volcanism 6 GRAINS 3969 1 33.5 14.8 biotite 1/70 (B) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" HYDROBIOTITE 3970 1 8.1 2.7 biotite 209/63 not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3973 1 70 15.6 biotite 115/62 not given "minimum age of metamorphic crystallization, age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3974 1 13.7 2.3 biotite 1/70 C not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3975 1 12.8 3.9 biotite 1/70 D not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3976 1 0.28 0.18 muscovite 25/63 (5/70A) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" PSEUDOMORPH AFTER SILLIMANITE 3977 1 0.23 0.12 muscovite 25/63 (5/70B) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3978 1 84.7 12.2 biotite (NOT GIVEN) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" FRESH BIOTITE "PRECAMBRIAN AGES OBTAINED BY RB-SR METHOD ON SAME BIOTITE AND COEXISTING K-FELDSPAR (VOLBORTH, 1962, P. 828)" 3979 1 18.1 7.2 biotite 149/63 not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3979 2 16.2 6.4 biotite 149/63 not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3980 1 30.7 12.1 biotite 55/63 not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3981 1 0.48 muscovite (NOT GIVEN) not given age not evaluated 3981 2 0.99 muscovite (NOT GIVEN) not given age not evaluated 3982 1 11.4 5.5 muscovite 93/61 (4/70) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" FRESH MUSCOVITE BOOKS 3983 1 24.8 4.3 biotite 6/70 (B) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 3984 1 8.1 1.4 biotite 6/70 (A) not given "age meaning uncertain (analysis questionable), initial age disturbed by later metamorphism" 4086 1 78.6 6.7 apatite 1(DF-1637) 7.03E-09 0.287 1195 0.243 1013 1.12 6.3 COOLING AGE FOR APATITE 4086 2 104 11 sphene 1(DF-1638) 7.03E-09 19.79 733 43.84 812 3.87 330 age of intrusion 4086 3 101 6.4 zircon 1(DF-1639) 7.03E-09 10.99 1628 7.21 534 1.12 190 age of intrusion 4087 1 93.3 6.8 apatite 2(DF-1640) 7.03E-09 0.431 1794 0.307 1280 1.12 7.9 minimum age of intrusion 4088 1 106 9 apatite 3(DF-1641) 7.03E-09 0.327 1362 0.203 845 1.11 5.3 age of intrusion 4089 1 98.3 7.9 apatite 4(DF-1642) 7.03E-09 0.372 1552 0.248 1032 1.1 6.5 age of intrusion 4090 1 107 9 apatite 5(DF-1645) 7.03E-09 0.349 1454 0.212 885 1.1 5.6 age of intrusion 4090 2 100 6.4 zircon 5(DF-1644) 7.03E-09 17.36 1366 11.44 450 1.11 300 age of intrusion 4091 1 55.6 5.6 apatite 6(DF-1646) 7.03E-09 0.163 681 0.193 803 1.1 5 COOLING AGE FOR APATITE 4091 2 93.6 8.5 zircon 6(DF-1647) 7.03E-09 13.71 1904 9.58 665 1.1 250 age of intrusion 4187 1 59.3 7.4 sphene 1 (SAGD-1) 6.85E-09 4.565 5.59 1.19 minimum age of intrusion 8 GRAINS COUNTED 4187 2 67.9 8.4 zircon 1 (SAGD-1) 6.85E-09 17.86 19.096 1.19 minimum age of intrusion 6 GRAINS COUNTED 4189 1 34.8 4.2 zircon 3 (TF-2) 6.85E-09 2.42 5.054 1.19 age of volcanism 7 GRAINS COUNTED 4190 1 31.4 3.8 zircon 4 (OWT-1) 6.85E-09 13.42 31.1 1.19 minimum age of volcanism 6 GRAINS COUNTED 4193 1 24.3 2.8 zircon 7 (TF-1) 6.85E-09 10.02 28.74 1.14 age of volcanism 4224 1 22.1 3.2 zircon 50 (GRP-1) 6.85E-09 2.182 7.198 1.19 age of intrusion 4253 1 12.4 1.4 zircon USGS(D)-UE6E-1344.5(B) 7.03E-09 1.63 10.5 1240 1.33 253 maximum age of volcanism SIX GRAINS 4253 2 1700 1000 zircon USGS(D)-UE6E-1344.5(B) 7.03E-09 16.5 253 0.65 3 1.33 16 "sample contains inherited material, age is too old" "ONE GRAIN, DETRITAL" A DETRITAL ZIRCON IN A TERTIARY TUFF 4272 1 68 zircon NOT GIVEN not given age of intrusion "UNPUBLISHED DATA PRODUCED BY R.P. ASHLEY, USGS, IN 1975" 4272 2 59 sphene NOT GIVEN not given age of intrusion "UNPUBLISHED DATA PRODUCED BY R.P. ASHLEY, USGS, IN 1975" 4369 1 87 10 zircon IP-99 6.85E-09 5.52 971 4.63 407 1.2 120 may denote delayed cooling 4 GRAINS COUNTED "THE ANALYTICAL DATA WAS RELEASED BY C.W. NAESER, USGS, DENVER, COLORADO. (THE CALCULATED AGE COULD READ 87.2 +/-10.3 M.Y. - COMPILER)." AGE MAY PERTAIN TO TIME OF EMPLACEMENT OR TIME OF ALTERATION. 4467 1 24.6 4 zircon 19 USGS(D)-71017 7.03E-09 7.59 246 23.1 375 1.26 590 age of later metamorphism "THE FISSION-TRACK AGE AGREES WITH K-AR MICA AGES (SAMPLE 80, P. 20, MARVIN AND OTHERS, 1973) INDICATING A STRONG THERMAL EVENT DURING LATE OLIGOCENE-EARLY MIOCENE TIME ALTHOUGH THE ROCK ACTUALLY WAS EMPLACED 1400-1500 M.Y. AGO" 4467 2 23.3 5.8 apatite 19 USGS(D)-71017 7.03E-09 0.0403 84 0.13 271 1.23 3.4 age of later metamorphism SEE COMMENT FOR ZIRCON AGE 4468 1 25.3 2.9 apatite 20 USGS(D)-73D52 7.03E-09 0.0159 398 0.0459 1147 1.22 12.1 age of uplift and cooling THIS AGE INDICATES A THERMAL EVENT THAT ANNEALED FISSION-TRACKS DURING LATE OLIGOCENE-EARLY MIOCENE TIME (SEE COMMENT FOR BIOTITE AGE FOR THIS SAMPLE). DREWES (1977) PUBLISHED AN AGE OF 24.4 M.Y. FOR THIS SAMPLE AND A WHOLE-ROCK RB-SR AGE OF 295 M.Y. 4468 2 zircon 20 USGS(D)-73D52 7.03E-09 1.25 "1,500.00" URANIUM CONTENT IS TOO HIGH TO PERMIT AN ACCURATE AGE DETERMINATION. 4469 1 26.1 3.5 apatite 21 USGS(D)-74D62 7.03E-09 0.15 313 0.414 862 1.2 11 age of later metamorphism "AGE IS SIMILAR TO PUBLISHED AGES (MARVIN AND OTHERS, 1973, P. 20) FOR OTHER ROCKS IN THE RINCON MOUNTAINS SUGGESTING A STRONG THERMAL EVENT DURING TERTIARY TIME. FISSION-TRACK AGE FOR ZIRCON CONCENTRATE WAS NOT DETERMINED BECAUSE THE URANIUM CONTENT WAS T" 4470 1 800 zircon 22 USGS(D)-74D57 7.03E-09 40 3.09 1.24 80 initial age disturbed by later metamorphism ROCK IS A MINIMUM OF 1400 M.Y. OLD. 4470 2 55 4.2 apatite 22 USGS(D)-74D57 7.03E-09 0.565 1177 0.745 1552 1.15 20 age of uplift and cooling 4526 1 84 3 apatite 1 8.46E-09 4.01 3.04 1.32 1.28 age of uplift and cooling 4527 1 96 4 apatite 2 8.46E-09 0.942 0.624 1.51 1.28 age of uplift and cooling 4528 1 83 4 apatite 3 8.46E-09 0.512 0.091 5.63 0.296 age of uplift and cooling FOLAND AND OTHERS (1971) OBTAINED A K-AR AGE OF 99 M.Y. FOR THIS SYENITE 4529 1 82 4 apatite 4 8.46E-09 0.76 0.136 5.59 0.296 age of uplift and cooling ZARTMAN AND OTHERS (1970) PUBLISHED A K-AR AGE OF 113 M.Y. FOR THIS GRANITE 4530 1 79 3 apatite 5 8.46E-09 0.948 0.548 1.73 0.914 age of uplift and cooling FAUL AND OTHERS (1963) PUBLISHED A K-AR AGE OF 405 M.Y. AND A RB-SR AGE OF 740 M.Y. FOR THIS GNEISS 4530 2 77 3 apatite 5 8.46E-09 2.52 0.482 5.23 0.296 age of uplift and cooling 4531 1 80 5 apatite 6 8.46E-09 0.199 0.114 1.75 0.914 age of uplift and cooling FAUL AND OTHERS (1963) PUBLISHED A K-AR AGE OF 324 M.Y. FOR THIS GNEISS 4532 1 81 3 apatite 7 8.46E-09 0.901 0.704 1.28 1.28 age of uplift and cooling "K-AR AGES INDICATE AN AGE OF OVER 250 M.Y. (KRUEGER AND REESMAN, 1971)" 4533 1 76 3 apatite 8 8.46E-09 0.634 0.528 1.2 1.28 age of uplift and cooling "K-AR AGES INDICATE AN AGE OF OVER 250 M.Y. (KREUGER AND REESMAN, 1971)" 4534 1 69 3 apatite 9 8.46E-09 1.02 0.944 1.08 1.28 age of uplift and cooling 4534 2 77 3 apatite 9 8.46E-09 1.207 0.714 1.69 0.914 age of uplift and cooling 4535 1 97 5 apatite 10 8.46E-09 0.759 0.115 6.6 0.296 age of uplift and cooling 4536 1 82 3 apatite 11 8.46E-09 0.73 0.131 5.57 0.296 age of uplift and cooling ARMSTRONG AND STUMP (1971) PUBLISHED A K-AR AGE OF 262 M.Y. FOR THIS GNEISS 4537 1 94 5 apatite 12 8.46E-09 0.628 0.098 6.41 0.296 age of uplift and cooling 4538 1 68 4 apatite 13 8.46E-09 0.164 0.155 1.06 1.28 age of uplift and cooling ZARTMAN AND MARVIN (1971) OBTAINED EARLY PALEOZOIC AGES FOR THIS GRANITE 4539 1 91 3 apatite HA1 8.46E-09 1.232 0.616 2 0.914 age of uplift and cooling FAIRBAIRN AND OTHERS (1960) PUBLISHED RB-SR MICA AGES OF 304 AND 318 M.Y. FOR THIS GRANITE 4540 1 72 3 apatite 15 8.46E-09 0.515 0.328 1.57 0.914 age of uplift and cooling THERE IS AN UNPUBLISHED K-AR MICA AGE OF 158 M.Y. FOR THIS SYENITE 4541 1 89 5 apatite 16 8.46E-09 0.395 0.282 1.4 1.28 age of uplift and cooling ZARTMAN AND OTHERS (1970) PUBLISHED A K-AR AGE OF 110 M.Y. FOR THIS GRANITE 4542 1 64 3 apatite 17 8.46E-09 1.178 0.274 4.3 0.296 age of uplift and cooling 4543 1 70 3 apatite 18 8.46E-09 2.188 1479 1.48 0.954 age of uplift and cooling 4544 1 84 5 apatite 19 8.46E-09 0.259 0.147 1.76 0.954 age of uplift and cooling HOEFS (1967) PUBLISHED A RB-SR WHOLE-ROCK AGE OF 227 M.Y. AND ZARTMAN AND OTHERS (1970) PUBLISHED A K-AR MICA AGE OF 216 M.Y. FOR THIS GRANITE 4545 1 100 4 apatite 20 8.46E-09 0.276 0.125 2.21 0.914 age of uplift and cooling THERE IS AN UNPUBLISHED K-AR MICA AGE OF 116 M.Y. FOR THIS GABBRO 4546 1 96 4 apatite 21 8.46E-09 0.499 0.247 2.02 0.954 age of uplift and cooling THERE IS AN UNPUBLISHED K-AR MICA AGE OF 120 M.Y. FOR THIS GABBRO 4547 1 89 4 apatite 22 8.46E-09 0.44 0.314 1.4 1.28 age of uplift and cooling 4548 1 68 3 apatite 23 8.46E-09 0.84 0.587 1.43 0.954 age of uplift and cooling 4549 1 94 3 apatite 24 8.46E-09 1.45 0.732 1.98 0.954 age of uplift and cooling 4550 1 123 5 apatite 25 8.46E-09 0.458 0.236 1.94 1.28 age of uplift and cooling THERE IS AN UNPUBLISHED K-AR MICA AGE OF 407 M.Y. FOR THIS PLUTON 4576 1 36 2 sphene (NOT GIVEN) not given age not evaluated NO ANALYTICAL DATA GIVEN 5008 1 6.9 1.3 zircon M153 6.85E-09 0.972 144 10.45 774 1.21 260 AGE OF VOLCANISM 5009 1 13.8 1.7 zircon M152 6.85E-09 2.57 369 13.89 999 1.22 350 AGE OF VOLCANISM 5010 1 17.4 1.6 zircon M87 6.85E-09 4.29 755 15.22 1338 1.01 460 AGE OF VOLCANISM 5011 1 14.8 1.6 zircon M75 6.85E-09 4.44 534 14.51 873 0.79 560 MINIMUM AGE OF VOLCANISM 5012 1 15.6 1.3 zircon M74 6.85E-09 4.72 918 14.8 1439 0.8 560 MINIMUM AGE OF VOLCANISM 5012 2 16.5 1.6 zircon M74 6.85E-09 3.9 632 16.91 1370 1.17 440 AGE OF VOLCANISM 5013 1 19 1.5 zircon M92 6.85E-09 4.09 927 18.2 2064 1.38 400 AGE OF VOLCANISM. 5013 2 18.2 1.7 apatite M92 6.85E-09 0.129 537 5.93 2469 1.37 13 AGE OF VOLCANISM 5014 1 18.9 1.4 zircon M28 6.85E-09 8.19 1137 26.84 1864 1.01 810 age of intrusion 5014 2 20.6 1.8 zircon M28 6.85E-09 8.22 1484 9.65 871 0.395 740 age of intrusion 5015 1 19.7 1.7 zircon M29B 6.85E-09 6.44 865 20.38 1368 1.02 610 THIS IS APPARENTLY A RESET AGE 5016 1 19.6 1.7 zircon M50 6.85E-09 5.17 957 13 1204 0.805 490 age of intrusion FRESHEST SAMPLE OBTAINABLE 5017 1 20.2 2.1 zircon M49B 6.85E-09 3.54 607 11.05 946 1.03 330 age of intrusion 5017 2 27 3.9 apatite M49B 6.85E-09 0.136 283 0.271 565 0.88 9.4 maximum age of intrusion 5018 1 21.2 1.9 zircon M83 6.85E-09 4.03 840 12.72 1325 1.09 350 AGE OF VOLCANISM 5018 2 23 3.6 apatite M83 6.85E-09 0.114 237 0.259 540 0.855 9.2 AGE OF VOLCANISM 5019 1 22.6 2.6 apatite M27A 6.85E-09 0.206 429 0.468 976 0.84 17 age of intrusion 5019 2 18.5 1.5 zircon M27A 6.85E-09 8.32 1464 10.95 963 0.395 840 age not evaluated 5020 1 23.3 2.3 zircon M98 6.85E-09 5.34 668 17.12 1070 1.22 430 age of intrusion 5021 1 26.2 2.3 zircon 75-S-20 6.85E-09 5.74 903 14.47 1139 1.08 410 MINIMUM AGE OF VOLCANISM 5022 1 26.5 2.6 zircon M90 6.85E-09 4.11 762 9.49 879 1 290 MINIMUM AGE OF VOLCANISM 5051 1 52.4 2.4 sphene USGS(D)MY-508 7.03E-09 9.92 1700 11.75 1006 0.844 1.04 325 AGE MAY RESULT FROM HEATING BY EOCENE RHYOLITE 5051 2 40.2 1.8 zircon USGS(D)MY-508 7.03E-09 6.35 1264 9.89 984 0.642 1.05 270 AGE MAY RESULT FROM HEATING BY EOCENE RHYOLITE 5051 3 38.8 3.2 apatite USGS(D)MY-508 7.03E-09 0.427 889 0.84 1749 0.508 1.28 19 AGE MAY RESULT FROM HEATING BY EOCENE RHYOLITE 5070 1 12.7 1.8 zircon 75T1 7.03E-09 234 1260 0.19 1.09 age of volcanism 5071 1 10.8 1.6 zircon 72027 7.03E-09 207 1356 0.153 1.15 age of volcanism 5072 1 5.2 1 zircon 75C2 7.03E-09 144 944 0.153 0.558 age of volcanism 5073 1 5.6 0.9 zircon 75C1 7.03E-09 182 1114 0.16 0.558 age of volcanism 5074 1 2.9 0.5 zircon 72P2 7.03E-09 144 1680 0.086 0.558 age of volcanism 5075 1 2.7 0.4 zircon 73A2 7.03E-09 131 2782 0.047 0.927 age of volcanism 5105 1 1.39 0.11 zircon 77G55 7.03E-09 0.423 45 19.14 1019 1.05 520 minimum age of volcanism 5105 2 1.46 0.12 zircon 77G55 7.03E-09 0.374 71 7.55 717 0.493 440 age of volcanism 5126 1 65.3 5.5 sphene E. LAKE CK.-1 (DF-848) 7.03E-09 10.3 2564 5.5 687 0.587 300 age of intrusion 5126 2 59.5 7.5 zircon E. LAKE CK.-1 (DF-849) 7.03E-09 9.87 777 8.77 345 0.887 320 minimum age of intrusion 5127 1 59.3 6.2 zircon WEST CROSS CREEK-1 (DF-850) 7.03E-09 4.36 1130 3.89 504 0.887 140 age of intrusion 5128 1 46.4 9.8 apatite WEST TENN.-1 (DF-1164) 7.03E-09 0.069 143 0.1 209 1.14 2.8 age of uplift and cooling 5129 1 65.3 6 zircon FULFORD-1 7.03E-09 6.21 1329 6.08 675 1.07 180 maximum age of intrusion 5131 1 64.2 4.8 zircon UTE-1 7.03E-09 10.3 2377 8.26 956 0.867 300 age of intrusion 5132 1 70.7 7.5 zircon UTE-2 (DF-1076) 7.03E-09 6.18 1258 4.49 456 0.862 170 age of intrusion 5132 2 66.9 7.5 apatite UTE-2 (DF-1075) 7.03E-09 1.96 490 7.19 899 4.12 50 age of intrusion 5133 1 72.1 7.9 zircon UTE-3 (DF-1077) 7.03E-09 7.6 1232 5.34 433 0.852 200 age of intrusion 5134 1 68.7 4.7 zircon LA PLATA-2 7.03E-09 12.9 2508 12.2 1188 1.09 360 age of intrusion 5135 1 66.9 5.2 zircon LA PLATA-3(DF-994) 7.03E-09 8.81 1916 8.57 1.09 250 age of intrusion 5135 2 72.8 5.5 apatite LA PLATA-3(DF-995) 7.03E-09 1.58 1466 1.36 1240 1.05 41 maximum age of intrusion 5136 1 60 5.6 zircon LA PLATA-4(DF-996) 7.03E-09 6.52 1238 7.08 672 1.09 210 age of intrusion 5136 2 79.1 20.4 apatite LA PLATA-4(DF-997) 7.03E-09 0.139 129 0.11 102 1.05 3.3 maximum age of intrusion 5137 1 69.6 7.4 zircon LA PLATA-5(DF-998) 7.03E-09 18.7 1040 17.5 487 1.09 510 age of intrusion 5137 2 50.3 4.2 apatite LA PLATA-5(DF-999) 7.03E-09 1.06 978 1.31 1217 1.05 40 may denote delayed cooling 5138 1 61.4 6 zircon RICO-1(DF-1166) 7.03E-09 4.78 1174 4.86 596 1.04 150 A THERMALLY-REDUCED AGE 5138 2 6.6 2.3 apatite RICO-1(DF-1168) 7.03E-09 0.016 34 0.169 353 1.14 4.8 A THERMALLY-REDUCED AGE 5138 3 78.4 5.8 sphene RICO-1(DF-1167 7.03E-09 8.46 1645 12.15 1181 1.89 210 minimum age of intrusion 5139 1 64.9 4.7 zircon RICO-2(DF-1146) 7.03E-09 9.89 2151 9.72 1058 1.07 290 minimum age of intrusion 5139 2 20.2 7.4 apatite RICO-2(DF-1145) 7.03E-09 0.017 36 0.038 121 1.14 1.6 A THERMALLY REDUCED AGE 5140 1 40.7 6.5 zircon OURAY-1(DF-1149) 7.03E-09 3.25 346 5.05 269 1.06 150 PROBABLY A REDUCED AGE 5140 2 7.7 3.4 apatite OURAY-1(DF-1148) 7.03E-09 0.011 22 0.093 93 1.14 2.6 PROBABLY A THERMALLY REDUCED AGE 5141 1 54.1 4 zircon OURAY-2(DF-1116) 7.03E-09 8.06 1865 9.81 1135 1.1 280 minimum age of intrusion 5141 2 15 5.6 apatite OURAY-2(DF-1117) 7.03E-09 0.017 35 0.06 125 0.89 2.1 PROBABLY A THERMALLY REDUCED AGE 5142 1 34.2 3.7 zircon SOPRIS-1(DF-1104) 7.03E-09 3.34 664 6.5 647 1.12 190 age of intrusion 5143 1 34.5 2.8 zircon TINCUP-1(DF-1150) 7.03E-09 5.67 1208 10.44 1112 1.06 310 age of intrusion 5143 2 37.3 6.4 epidote TINCUP-1(DF-1151) 7.03E-09 0.708 177 3.91 489 3.46 36 age of intrusion 5144 1 11.5 1.2 zircon RND. MTN.-1(DF-1160) 7.03E-09 2.16 489 11.74 1332 1.05 360 minimum age of intrusion 5144 2 9.7 2.8 apatite RND. MTN.-1(DF-1147) 7.03E-09 0.025 52 0.173 361 1.14 4.9 "material inherited from source rock, maximum age for unit" 5145 1 35.3 3.3 zircon PORP. CK.-1(DF-1152) 7.03E-09 4.19 911 7.45 810 1.05 230 age of intrusion 5146 1 66.8 5.5 zircon ELDORA-1(DF-934) 7.03E-09 7.49 1560 8.5 885 1.27 210 age of intrusion 5146 2 61.8 5.5 zircon ELDORA-1(DF-1000) 7.03E-09 9.31 1293 10.67 741 1.19 290 age of intrusion 5146 3 58.5 8.8 apatite ELDORA-1(DF-942) 7.03E-09 0.168 311 0.2 370 1.17 5.5 minimum age of intrusion 5147 1 61.7 5.5 zircon APEX-1(DF-1188) 7.03E-09 7.1 1414 7.2 717 1.05 220 age of intrusion 5147 2 71.1 17.7 apatite APEX-1(DF-1189) 7.03E-09 0.428 99 0.7 162 1.96 11.4 AGE APPEARS TOO OLD 5148 1 58.8 4.4 zircon APEX-2(DF-1190) 7.03E-09 8 1926 8.47 1020 1.04 260 age of intrusion 5148 2 66.7 6.7 apatite APEX-2(DF-1191) 7.03E-09 0.285 594 0.498 1037 1.96 8.1 maximum age of intrusion 5149 1 67.9 5.3 sphene EMPIRE-1(DF-932) 7.03E-09 11.2 1872 11.4 950 1.16 315 age of intrusion 5149 2 37.3 2.2 apatite EMPIRE-1(DF-941) 7.03E-09 0.847 1765 1.568 3266 1.16 43 age of uplift and cooling 5150 1 10.4 1.1 zircon CHI. BAS. 217 7.03E-09 1.46 494 9.01 1.07 270 age of intrusion 5151 1 9.2 0.9 zircon CHI. BAS. 137 7.03E-09 1.87 480 13.3 1688 1.08 390 age of intrusion 5153 1 44.9 2.7 zircon JS-2(41 FT.) 7.03E-09 8.92 661 13.06 484 1.1 750 THIS IS PROBABLY A REDUCED AGE 5153 2 45.1 3.8 zircon JS-2(3361 FT.) 7.03E-09 7.32 351 10.56 253 1.09 400 PROBABLY A REDUCED AGE 5154 1 35 2.7 zircon H1200 7.03E-09 7.85 1235 16.76 1319 1.25 430 age of intrusion 5155 1 24.2 2.5 zircon BMG-1QC 7.03E-09 2.88 614 7.78 828 1.09 230 age of intrusion 5157 1 47 3.9 zircon LEADVILLE-2 7.03E-09 13.8 1343 20.2 984 1.15 510 age not evaluated 6175 1 36 3 apatite K1A 6.85E-09 0.478 418 1.5 375 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 22" 6176 1 24 2 apatite K2A 6.85E-09 0.208 286 0.96 264 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 27" 6177 1 43 4 apatite K3A 6.85E-09 0.594 297 1.54 385 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 20" 6178 1 24 3 apatite XK3A 6.85E-09 0.745 134 3.71 382 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 26" 6178 2 85 9 sphene XK3S 6.85E-09 1.17 247 1.53 281 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 26" 6179 1 37 4 apatite K4A 6.85E-09 0.357 223 1.084 271 1.833 "A COOLING AGE. SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 49, ENTRY NO. 26" 6180 1 39 3 apatite K6A 6.85E-09 2.21 566 6.263 476 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 24" 6180 2 81 7 sphene K6S 6.85E-09 4.758 571 6.56 446 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 3, ENTRY NO. 24" 6181 1 81 7 sphene K7S 6.85E-09 3.41 410 4.68 374 1.833 minimum age of intrusion "SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 49, ENTRY NO. 20" 6181 2 56 5 apatite K7A 6.85E-09 4.27 267 0.853 320 1.833 A COOLING AGE 6182 1 42 4 apatite K8A 6.85E-09 0.365 274 0.966 290 1.833 "A COOLING AGE. SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 49, ENTRY NO. 25" 6183 1 48 4 apatite K10A 6.85E-09 0.8 400 1.86 465 1.833 age of uplift and cooling 6184 1 34 3 apatite K21A 6.85E-09 0.384 336 1.277 382 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 28" 6185 1 43 3 apatite K42A 6.85E-09 0.638 676 1.672 418 1.833 "A COOLING AGE. SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 49, ENTRY NO. 24" 6186 1 39 4 apatite BC50A 6.85E-09 0.556 292 1.616 403 1.833 "A COOLING AGE. SAMPLE LISTED BY ARMSTRONG, 1975, ISOCHRON/WEST, NO. 14, P. 49, ENTRY NO. 23" 6187 1 44 4 apatite K112A 6.85E-09 0.41 256 1.046 340 1.833 age of uplift and cooling "SAMPLE LISTED BY ARMSTRONG, 1976, ISOCHRON/WEST, NO. 15, P. 4, ENTRY NO. 29" 6192 1 53 apatite 27 8.46E-09 2.73 2.3 0.902 age of uplift and cooling 6193 1 70 apatite 28 8.46E-09 0.349 2.04 8.17 age of uplift and cooling 6194 1 95 apatite 29 8.46E-09 5.46 2.56 0.902 age of uplift and cooling 6195 1 51 apatite 30 8.46E-09 2.77 2.44 0.902 age of uplift and cooling 6195 2 64 apatite 30 8.46E-09 3 2.1 0.902 age of uplift and cooling 6196 1 76 apatite 31 8.46E-09 3.36 1.99 0.902 age of uplift and cooling 6197 1 117 apatite 32 8.46E-09 1.76 0.674 0.902 age of uplift and cooling 6198 1 78 apatite 33 8.46E-09 0.48 0.275 0.902 age of uplift and cooling 6199 1 90 apatite 34 8.46E-09 1.63 0.815 0.902 age of uplift and cooling 6200 1 74 apatite 35 8.46E-09 0.354 0.215 0.902 age of uplift and cooling 6201 1 61 apatite 36 8.46E-09 0.193 0.143 0.902 age of uplift and cooling 6202 1 61 apatite 37 8.46E-09 1.72 1.27 0.902 age of uplift and cooling 6203 1 82 apatite 38 8.46E-09 0.207 0.113 0.902 age of uplift and cooling 6204 1 48 apatite 39 8.46E-09 0.444 0.415 0.902 age of uplift and cooling 6205 1 58 apatite 40 8.46E-09 0.2 0.154 0.902 age of uplift and cooling 6206 1 65 apatite 41 8.46E-09 0.726 0.497 0.902 age of uplift and cooling 6207 1 51 apatite 42 8.46E-09 2.35 2.03 0.902 age of uplift and cooling 6208 1 62 apatite 53 8.46E-09 0.105 0.684 8.17 age of uplift and cooling 6209 1 92 apatite 54 8.46E-09 0.141 0.617 8.17 age of uplift and cooling 6210 1 78 apatite 55 8.46E-09 0.593 3.1 8.17 age of uplift and cooling 6211 1 55 apatite 56 8.46E-09 1.39 1.13 0.902 age of uplift and cooling 6212 1 105 apatite 57 8.46E-09 0.295 1.14 8.17 age of uplift and cooling 6213 1 74 apatite 58 8.46E-09 0.349 1.91 8.17 age of uplift and cooling 6214 1 100 apatite 59 8.46E-09 1.32 5.34 8.17 age of uplift and cooling 6215 1 132 apatite 60 8.46E-09 1.69 5.16 0.894 age of uplift and cooling 6216 1 108 apatite 61 8.46E-09 0.526 0.216 0.894 age of uplift and cooling 6217 1 93 apatite 62 8.46E-09 0.185 0.088 0.894 age of uplift and cooling 6217 2 79 apatite 62 8.46E-09 0.164 0.0918 0.894 age of uplift and cooling 6217 3 99 apatite 62 8.46E-09 0.205 0.0918 0.894 age of uplift and cooling 6218 1 137 apatite 63 8.46E-09 1.17 0.377 0.894 age of uplift and cooling 6218 2 86 apatite 63 8.46E-09 1.3 0.67 0.894 age of uplift and cooling 6218 3 100 apatite 63 8.46E-09 0.995 0.439 0.894 age of uplift and cooling 6219 1 77 apatite 64 8.46E-09 0.23 0.133 0.894 age of uplift and cooling 6219 2 89 apatite 64 8.46E-09 0.313 0.156 0.894 age of uplift and cooling 6220 1 122 apatite 65 8.46E-09 2.5 0.911 0.894 age of uplift and cooling 6221 1 131 apatite 66 8.46E-09 0.31 0.105 0.894 age of uplift and cooling 6221 2 94 apatite 66 8.46E-09 0.3 0.141 0.894 age of uplift and cooling 6222 1 159 apatite 67 8.46E-09 1.42 0.396 0.894 age of uplift and cooling 6222 2 119 apatite 67 8.46E-09 1.36 0.505 0.894 age of uplift and cooling 6222 3 204 apatite 67 8.46E-09 1.91 0.411 0.894 age of uplift and cooling 6223 1 68 apatite 68 8.46E-09 2.5 1.63 0.902 age of uplift and cooling 6224 1 111 apatite 69 8.46E-09 0.874 5.2 0.894 age of uplift and cooling 6224 2 apatite 69 8.46E-09 1.17 0.466 age of uplift and cooling (NO AGE CALCULATED) 6225 1 127 apatite 70 8.46E-09 0.228 0.725 8.17 age of uplift and cooling 6225 2 145 apatite 70 8.46E-09 0.61 1.7 8.17 age of uplift and cooling 6226 1 93 apatite 71 8.46E-09 0.277 1.21 8.17 age of uplift and cooling 6226 2 115 apatite 71 8.46E-09 0.216 0.757 8.17 age of uplift and cooling 6227 1 73 apatite 72 8.46E-09 0.187 1.03 8.17 age of uplift and cooling 6228 1 101 apatite 73 8.46E-09 0.12 0.492 8.17 age of uplift and cooling 6228 2 89 apatite 73 8.46E-09 0.1 0.459 8.17 age of uplift and cooling 6229 1 89 apatite 74 8.46E-09 0.856 3.89 8.17 age of uplift and cooling 6230 1 152 apatite 75 8.46E-09 4.79 6.32 8.17 age of uplift and cooling 6230 2 97 apatite 75 8.46E-09 4.99 2.31 0.902 age of uplift and cooling 6231 1 70 apatite 77 8.46E-09 0.907 5.28 8.17 age of uplift and cooling 6231 2 57 apatite 77 8.46E-09 0.962 0.752 0.902 age of uplift and cooling 6232 1 84 apatite 78 8.46E-09 0.894 age of uplift and cooling 6322 1 110 8 apatite VT./AV-1-73 6.85E-09 1524 938 1.12 A COOLING AGE 6322 2 187 34 zircon VT./AV-1-73 6.85E-09 808 146 1.12 age of intrusion 3 GRAINS 6323 1 93 10 apatite N.H./AV-2-73 6.85E-09 586 426 1.12 A COOLING AGE 6324 1 105 14 zircon N.H./WN-4-73 6.85E-09 871 282 1.12 age of volcanism 3 GRAINS 6325 1 88 10 apatite N.H./WN-6-73 6.85E-09 745 578 1.12 A COOLING AGE 6326 1 72 10 apatite N.H./WB-7-73 6.85E-09 373 353 1.12 A COOLING AGE 6327 1 118 12 apatite N.H./PK-8-73 6.85E-09 956 547 1.12 age of intrusion 6327 2 109 12 zircon N.H./PK-8-73 6.85E-09 1481 464 1.12 minimum age of intrusion 4 GRAINS 6328 1 96 16 apatite N.H./PL-9-73 6.85E-09 317 218 1.12 A COOLING AGE 6329 1 89 8 apatite VT./AS-10-73 6.85E-09 833 636 1.12 A COOLING AGE 6329 2 132 32 zircon VT./AS-10-73 6.85E-09 277 77 1.12 age of intrusion 2 GRAINS 6330 1 92 8 apatite N.H./N.C.-11-73 6.85E-09 983 729 1.12 A COOLING AGE 6330 2 183 22 zircon N.H./N.C.-11-73 6.85E-09 1804 333 1.12 maximum age of intrusion 4 GRAINS 6331 1 80 12 apatite N.H./FN-12-73 6.85E-09 348 297 1.12 A COOLING AGE 6331 2 178 28 zircon N.H./FN-12-73 6.85E-09 1071 204 1.12 age of intrusion 3 GRAINS 6332 1 169 26 apatite VT-33AP. 6.85E-09 0.482 998 1.01 1792 5.88 THE AGE APPEARS TOO OLD 6332 2 164 25 zircon VT-33SP. 6.85E-09 1.95 291 4.29 634 5.88 THE AGE APPEARS TOO OLD 6333 1 105 16 apatite ARK-1AP. 6.85E-09 1.2 488 1.16 313 1.66 age of intrusion 6334 1 171 26 apatite NH-230AP. 6.85E-09 0.482 941 0.854 742 5.01 ROCK HAS BEEN HYDROTHERMALLY ALTERED AGE MAY INDICATE TIME OF ALTERATION 6334 2 260 40 apatite NH-530AP. 6.85E-09 0.573 498 0.662 864 5.01 minimum age of intrusion 6334 3 235 36 apatite NH-972AP. 6.85E-09 0.838 1455 1.075 1782 5.01 AGE APPEARS LOW 6335 1 27 6 apatite NM-1AP. 6.85E-09 0.0725 63 0.278 242 1.66 age of intrusion 6335 2 34 5 zircon NM-1SP. 6.85E-09 0.212 184 0.645 561 1.66 age of intrusion 6351 1 36 4 apatite 25. K22 6.85E-09 age of uplift and cooling 6635 1 64.8 apatite H29-14 6.85E-09 29.7 1189 33.7 1347 1.29 "40 GRAINS, 65-115 MESH" A COOLING AGE 6636 1 65.9 apatite H29-9 6.85E-09 31.4 1256 35.1 1404 1.32 "40 GRAINS, 65-115 MESH" A COOLING AGE 6637 1 68.2 apatite S30-5 6.85E-09 24.2 629 27 754 1.35 "26-28 GRAINS, 65-115 MESH" A COOLING AGE 6638 1 69.3 apatite H31-1 6.85E-09 9.4 452 10.6 423 1.29 "48-40 GRAINS, 65-115 MESH" A COOLING AGE 6639 1 66.9 apatite H28-1 6.85E-09 5.9 273 7.1 286 1.32 "40 GRAINS, 65-115 MESH" A COOLING AGE 6640 1 60.1 apatite H23-13 6.85E-09 12.2 293 16.6 398 1.32 "24 GRAINS, 65-115 MESH" A COOLING AGE 6641 1 65.4 apatite H23-8 6.85E-09 8.1 323 9.7 389 1.29 "40 GRAINS, 65-115 MESH" A COOLING AGE 6642 1 65.9 apatite S31-10 6.85E-09 13.7 546 17.1 684 1.35 "40 GRAINS, 65-115 MESH" A COOLING AGE 6643 1 70.8 apatite S28-4 6.85E-09 14.3 572 16.7 667 1.35 "40 GRAINS, 65-115 MESH" A COOLING AGE 6644 1 66.7 apatite S1-1 6.85E-09 9.7 387 11.7 468 1.32 "40 GRAINS, 65-115 MESH" A COOLING AGE 6645 1 65.7 apatite H14-12 6.85E-09 5.9 283 7.1 226 1.29 "32-48 GRAINS, 65-115 MESH" A COOLING AGE 6646 1 63.6 apatite H10-8 6.85E-09 21.6 1039 26.8 1072 1.29 "40-48 GRAINS, 65-115 MESH" A COOLING AGE 6647 1 62.9 apatite H10-6 6.85E-09 22.7 725 29.1 1164 1.32 "32-40 GRAINS, 65-115 MESH" A COOLING AGE 6648 1 65.4 apatite H10-2 6.85E-09 7.2 289 8.8 351 1.29 "40 GRAINS, 65-115 MESH" A COOLING AGE 6649 1 50.7 apatite H7-9 6.85E-09 12.4 597 19.8 793 1.32 "40-48 GRAINS, 65-115 MESH" A COOLING AGE 6650 1 62 apatite H6-8 6.85E-09 5 199 6.3 251 1.29 "40 GRAINS, 65-115 MESH" A COOLING AGE 6651 1 69.7 apatite S16-7 6.85E-09 5 238 5.9 277 1.35 "40-48 GRAINS, 65-115 MESH" A COOLING AGE 6652 1 56.4 apatite S9-2 6.85E-09 8.5 339 12.4 497 1.35 "40 GRAINS, 65-115 MESH" A COOLING AGE 6740 1 44 4.1 zircon E-516B 6.85E-09 5.64 1070 8.84 839 1.13 age of intrusion "AGE ALSO REPORTED IN USGS PROFESSIONAL PAPER 900 (1974), P. 32, AND BY ELLIOTT (1974)" 6741 1 40.6 3.5 zircon E-85G 6.85E-09 5.62 1170 9.64 1004 1.13 age of intrusion "AGE ALSO REPORTED IN USGS PROFESSIONAL PAPER 900 (1974), P. 32, AND BY ELLIOTT (1974)" 6742 1 84.6 11.2 sphene E-468A 6.85E-09 2.48 517 1.92 401 2.15 age of intrusion "AGE ALSO REPORTED IN USGS PROFESSIONAL PAPER 900 (1974), P. 32, AND BY ELLIOTT (1974)" 7082 1 0.26 0.05 glass (NOT GIVEN) not given age of volcanism "NO ANALYTICAL DATA GIVEN. ANALYSIS DONE BY GLEN IZETT, USGS, DENVER" 7236 1 30.2 2.1 zircon 81. USGS(D)-A 7.03E-09 3.9 1623 6.83 1422 0.857 250 minimum age of volcanism "1422 INDUCED TRACKS COUNTED, NOT 1623 AS PUBLISHED --COMPILER" 7236 2 30.1 3 zircon 81. USGS(D)-A 7.03E-09 2.81 729 6.04 783 1.05 180 minimum age of volcanism 6 GRAINS COUNTED 7249 1 63.9 9 apatite 94. USGS(D)-FT-01 7.03E-09 0.207 432 0.199 415 1.03 5.6 "AGE IS A COOLING AGE, AN INDICATION OF TIME OF UPLIFT IN FRONT RANGE. PEGMATITE PROBABLY FORMED 1400 M.Y. AGO." 7250 1 109 12 apatite 95. USGS(D)-FT-02 7.03E-09 0.444 926 0.249 518 1.03 7 "AGE IS A COOLING AGE, AN INDICATION OF TIME OF UPLIFT IN FRONT RANGE. GNEISS WAS PROBABLY FORMED ABOUT 1700 M.Y. AGO." 7253 1 33.6 3 zircon 98. USGS(D)-73-N7 7.03E-09 8.75 1094 15.15 947 0.973 450 3 GRAINS COUNTED THE AGE OF THE GRANITE IS ABOUT 35 M.Y. 7253 2 36.2 4 sphene 98. USGS(D)-73-N7 7.03E-09 5.08 862 9.55 641 1.14 240 3 GRAINS COUNTED AGE OF THE GRANITE IS ABOUT 35 M.Y. 7254 1 44.2 4 zircon 99. USGS(D)-73-N8 7.03E-09 12.72 119 18.14 798 1.06 490 age of intrusion 3 GRAINS COUNTED 7254 2 45.9 4 sphene 99. USGS(D)-73-N8 7.03E-09 7.4 1234 10.68 890 1.11 280 age of intrusion 4 GRAINS COUNTED 7255 1 45.5 5.1 zircon 100. USGS(D)-TL-F6-16 7.03E-09 4.95 710 7.75 556 1.19 190 age of intrusion 4 GRAINS COUNTED 7256 1 43.4 1.8 sphene 101. USGS(D)-73-N9 7.03E-09 5.62 1172 8.33 868 1.08 220 age of intrusion 5 GRAINS COUNTED 7330 1 27 1.2 zircon 175. USGS(D)-BJS-2 7.03E-09 5.09 825 13.95 1130 1.24 320 age of volcanism 7344 1 10.1 0.9 zircon 189. USGS(D)-TSV-103-78 7.03E-09 0.74 128 4.25 367 0.969 130 age of intrusion 7344 2 14.8 4.8 apatite 189. USGS(D)-TSV-103-78 7.03E-09 0.015 43 0.065 184 1.01 1.9 AGE IS PROBABLY TOO OLD; ZIRCON AGE OF 10.1 M.Y. IS MORE RELIABLE AGE 7345 1 9.6 0.7 zircon 190. USGS(D)-TSV-102-78 7.03E-09 1.05 195 6.36 593 0.973 190 age of intrusion 7346 1 6.3 0.8 zircon 191. USGS(D)-TSV-107-78 7.03E-09 0.755 133 6.86 605 0.965 200 age of volcanism 7347 1 11.5 1.3 zircon 192. USGS(D)-TSV-58-77 7.03E-09 0.489 111 2.84 322 1.12 70 age of volcanism 7355 1 0.78 0.21 zircon 200. USGS(D)-3149-10 7.03E-09 0.126 21 8.86 738 0.92 280 age of volcanism 7356 1 1.7 0.12 zircon 201. USGS(D)-3149-11 7.03E-09 0.321 61 10.59 1005 0.912 330 age of volcanism 7357 1 0.57 0.08 zircon 202. USGS(D)-3149-2 7.03E-09 0.088 20 8.76 994 0.951 270 age of volcanism THE PUBLISHED VALUE OF 7.03 FOR INDUCED TRACKS/SQ. CM. IS IN ERROR --COMPILER 7358 1 4.1 0.2 zircon 203. USGS(D)-3149-7 7.03E-09 1.02 226 13.99 1554 0.935 430 age of volcanism 7359 1 0.13 0.1 zircon 204. USGS(D)-3149-5 7.03E-09 0.0251 5 10.55 1050 0.943 320 age of volcanism 7360 1 6.8 0.7 zircon 205. USGS(D)-3149-9 7.03E-09 0.597 130 4.87 530 0.928 150 age of volcanism 7364 1 27.8 1.4 sphene 209. USGS(D)-SA-5 7.03E-09 0.259 195 1.354 507 2.41 18 age of volcanism RATTE AND GASKILL (1975) REPORTED AN AGE OF 27.6 M.Y. FOR THIS SPHENE 7365 1 31.2 3.3 zircon 210. USGS(D)-SA-3 7.03E-09 1.01 247 2.16 265 1.12 60 age of volcanism "RATTE AND GASKILL (1975) PUBLISHED AN AGE OF 30.2 M.Y. FOR THIS ZIRCON. SAMPLE NUMBER SHOULD BE GR-95A, NOT SA-3" 7729 1 61.3 16.9 apatite GM-2-1550 6.85E-09 age of uplift and cooling 7730 1 64.1 16.8 apatite PD5 6.85E-09 age of uplift and cooling 7732 1 63.1 9.8 apatite TCM2 6.85E-09 age of uplift and cooling 7733 1 66.2 13.3 apatite MS1 6.85E-09 age of uplift and cooling 7800 1 1569 zircon HRL-1 6.85E-09 0.2477 0.0189 13.08 4.39 age not evaluated ONE GRAIN 7800 2 1471 zircon HRL-2 6.85E-09 0.3225 0.0264 12.198 4.39 age not evaluated ONE GRAIN 7800 3 1554 zircon HRL-4 6.85E-09 0.2756 0.0213 12.971 4.39 age not evaluated ONE GRAIN 7800 4 1339 zircon HRL-5 6.85E-09 0.4463 0.0406 10.985 4.39 age not evaluated THE OVERGROWTH ON ONE GRAIN 7800 5 2346 zircon HR-7 6.85E-09 0.2783 0.0133 20.874 4.39 ROUNDED DETRITAL CORE OF ONE GRAIN MINIMUM AGE FOR CORE OF ZIRCON 7801 1 1561 zircon 6.85E-09 0.3609 0.0277 13.035 4.39 age not evaluated ONE GRAIN 7801 2 1554 zircon HRL-9 6.85E-09 0.3602 0.0278 12.965 4.39 age not evaluated ONE GRAIN 7801 3 1882 zircon HRL-10 6.85E-09 0.2015 0.0125 16.121 4.39 age not evaluated ONE GRAIN 7802 1 2091 zircon SB-3T 6.85E-09 0.3606 0.0198 18.223 4.39 age not evaluated ONE GRAIN 2 OTHER DETERMINATION ON THIS GRAIN GAVE AGES OF 2138 AND 2046 M.Y. 7802 2 1821 zircon SB-5 6.85E-09 0.2838 0.0183 15.522 4.39 age not evaluated ONE GRAIN 7802 3 1773 zircon SB-9 6.85E-09 0.3889 0.0258 15.055 4.39 age not evaluated ONE GRAIN 7802 4 1845 zircon SB-10 6.85E-09 0.197 0.0125 15.76 4.39 age not evaluated ONE GRAIN 7803 1 316 zircon BS-1-I 6.85E-09 0.1734 0.0725 2.391 4.39 ONE GRAIN COOLING AGE 7803 2 320 zircon BS-1-II 6.85E-09 0.1551 0.0641 2.423 4.39 ONE GRAIN (REPEAT AGE DETERMINATION) COOLING AGE 7803 3 318 zircon BS-2 6.85E-09 0.1551 0.0638 2.41 4.39 ONE GRAIN COOLING AGE 7803 4 434 zircon BS-3 6.85E-09 0.2709 0.0817 3.317 4.39 ONE GRAIN COOLING AGE 7803 5 432 zircon BS-4 6.85E-09 0.0678 0.0206 3.298 4.39 ONE GRAIN COOLING AGE 7804 1 316 zircon BS-5 6.85E-09 0.1987 0.083 2.394 4.39 ONE GRAIN COOLING AGE 7804 2 247 zircon BS-6 6.85E-09 0.1531 0.0823 1.861 4.39 ONE GRAIN COOLING AGE 7804 3 370 zircon BS-7 6.85E-09 0.2836 0.1009 2.809 4.39 ONE GRAIN COOLING AGE 7804 4 183 zircon BS-8 6.85E-09 0.0921 0.0673 1.37 4.39 ONE GRAIN COOLING AGE 7804 5 337 zircon BS-9 6.85E-09 0.0738 0.0289 2.554 4.39 ONE GRAIN COOLING AGE 7805 1 226 zircon BS-10 6.85E-09 0.0925 0.0544 1.701 4.39 ONE GRAIN COOLING AGE 7805 2 323 zircon BS-11T 6.85E-09 0.1919 0.0785 2.444 4.39 ONE GRAIN 2 OTHER DETERMINATIONS ON THIS GRAIN GAVE AGES OF 339 AND 309 M.Y. COOLING AGE 7805 3 286 zircon BS-12T 6.85E-09 0.0658 0.0305 2.159 4.39 ONE GRAIN 2 OTHER DETERMINATIONS ON THIS GRAIN GAVE AGES OF 282 AND 290 M.Y. COOLING AGE 7805 4 256 zircon BS-13T 6.85E-09 0.0806 0.0419 1.925 4.39 ONE GRAIN 2 OTHER DETERMINATIONS ON THIS GRAIN GAVE AGES OF 221 AND 311 M.Y. COOLING AGE 7805 5 447 zircon BS-14T 6.85E-09 0.1313 0.0384 3.42 4.39 ONE GRAIN 2 OTHER DETERMINATIONS ON THIS GRAIN GAVE AGES OF 446 AND 454 M.Y. COOLING AGE 7920 1 600 muscovite DM1A 6.90E-09 0.004 SPURIOUS AGE; PEGMATITE IS AROUND 255 M.Y. OLD. 7920 2 600 muscovite DM1B 6.90E-09 0.0015 SPURIOUS AGE; PEGMATITE IS AROUND 255 M.Y. OLD 7920 3 1000 muscovite DM1C 6.90E-09 0.0015 SPURIOUS AGE; PEGMATITE IS AROUND 255 M.Y. OLD 7920 4 25 biotite DM1D 6.90E-09 0.16 SPURIOUS AGE; PEGMATITE IS AROUND 255 M.Y. OLD. 7920 5 210 biotite DM1E 6.90E-09 1.1 minimum age of intrusion 7921 1 1700 muscovite DM2A 6.90E-09 0.005 SPURIOUS AGE; PEGMATITE IS AROUND 255 M.Y. OLD. 7922 1 35 muscovite GMYB11 6.90E-09 0.1 SPURIOUS AGE; PEGMATITE IS PROBABLY AROUND 2600 M.Y. 7923 1 75 biotite GMYB5 6.90E-09 0.066 SPURIOUS AGE; NORITE IS PROBABLY AROUND 2600 M.Y. OLD 7924 1 120 muscovite BP-43-57 6.90E-09 0.004 SPURIOUS AGE; ROCK IS PRECAMBRIAN IN AGE. 7924 2 490 muscovite BP-43-57 6.90E-09 0.0003 VERY FINE MUSCOVITE SPURIOUS AGE; ROCK IS PRECAMBRIAN IN AGE. 8099 1 0.55 0.3 glass NOT GIVEN 6.85E-09 0.0008 3 0.044 213 0.5 THIS AGE APPEARS TOO YOUNG. 8153 1 114 8 apatite VT./AV-1-73 6.85E-09 1524 938 1.12 age of uplift and cooling 8153 2 165 12 zircon VT./AV-1-73 6.85E-09 4152 852 1.12 minimum age of intrusion K-AR AGE OF 171 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8154 1 96 10 apatite N.H./AV-2-73 6.85E-09 586 426 1.12 age of uplift and cooling BIOTITE K-AR AGE OF 168 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8155 1 107 11 zircon ZIRCON 6.85E-09 1564 497 1.12 minimum age of intrusion BIOTITE K-AR AGE OF 121 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8156 1 90 10 apatite N.H./WN-6-73 6.85E-09 745 578 1.12 age of uplift and cooling BIOTITE K-AR AGE OF 161 M.Y. REPORTED BY FOLAND AND FAUL(1977). APATITE FISSION TRACK AGE OF 87 M.Y. (RECALCULATED) REPORTED BY ZIMMERMAN AND OTHERS(1975). 8157 1 81 8 apatite N.H./WN-7-73 6.85E-09 401 353 1.12 age of uplift and cooling BIOTITE K-AR AGE OF 117 M.Y. REPORTED BY FOLAND AND FAUL(1977). APATITE FISSION TRACK AGE OF 109 M.Y. (RECALCULATED) REPORTED BY ZIMMERMAN AND OTHERS(1975). 8158 1 122 12 apatite N.H./PK-8-73 6.85E-09 957 547 1.12 minimum age of intrusion 8158 2 108 9 zircon N.H./PK-8-73 6.85E-09 2196 694 1.12 minimum age of intrusion BIOTITE K-AR AGE OF 121 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8159 1 102 16 apatite N.H./PL-9-73 6.85E-09 317 218 1.12 age of uplift and cooling BIOTITE K-AR AGE OF 180 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8160 1 101 6 apatite VT./AS-1-73 6.85E-09 2294 1583 1.12 age of uplift and cooling APATITE FISSION TRACK AGE OF 101 M.Y. (RECALCULATED) REPORTED BY ZIMMERMAN AND OTHERS(1975). 8160 2 125 20 zircon VT./AS-10-73 6.85E-09 684 186 1.12 minimum age of intrusion BIOTITE K-AR AGE OF 119 M.Y. REPORTED BY FOLAND AND FAUL (1977). 8161 1 94 8 apatite N.H./N.C.-11-73 6.85E-09 983 729 1.12 age of uplift and cooling 8161 2 163 14 zircon N.H./N.C.-11-73 6.85E-09 3116 647 1.12 minimum age of intrusion BIOTITE K-AR AGE OF 180 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8162 1 82 12 apatite N.H./FN-12-73 6.85E-09 348 297 1.12 age of uplift and cooling 8162 2 173 19 zircon N.H./FN-12-73 6.85E-09 1875 364 1.12 minimum age of intrusion BIOTITE K-AR AGE OF 194 M.Y. REPORTED BY FOLAND AND FAUL(1977). 8163 1 7.1 0.7 zircon 1. (M153) 7.03E-09 0.972 144 10.45 774 1.28 260 age of volcanism 8164 1 14.2 0.9 zircon 2. M152 7.03E-09 2.57 369 13.89 999 1.29 350 age of volcanism 8165 1 18 0.8 zircon 3. (M89) 7.03E-09 4.29 755 15.22 1338 1.07 460 minimum age of volcanism 8166 1 15.3 0.8 zircon 4. (M75) 7.03E-09 4.44 534 14.51 873 0.835 560 AGE IS TOO YOUNG 8167 1 16.1 0.7 zircon 5. (M74) 7.03E-09 4.72 918 14.8 1439 0.846 560 AGE IS TOO YOUNG 8167 2 17.1 0.8 zircon 5. (M74) 7.03E-09 3.9 632 16.91 1370 1.24 440 AGE IS TOO YOUNG 8168 1 19.6 0.8 zircon 6. (M92) 7.03E-09 4.09 927 18.2 2064 1.46 400 age of volcanism 8168 2 18.8 1.7 apatite 6. (M92) 7.03E-09 0.129 537 5.93 2469 1.45 13 maximum age of volcanism 8169 1 19.5 0.7 zircon 7. (M28) 7.03E-09 8.19 1137 26.84 1864 1.07 810 AGE IS TOO YOUNG 8169 2 21.3 0.9 zircon 7. (M28) 7.03E-09 8.22 1484 9.65 871 0.418 740 age of intrusion 8170 1 20.4 0.9 zircon 8. (M29B) 7.03E-09 6.44 865 20.38 1368 1.08 610 THIS AGE IS TOO YOUNG 8171 1 20.2 0.9 zircon 9. (M50) 7.03E-09 5.17 957 13 1204 0.851 490 age of intrusion 8172 1 20.9 1.1 zircon 10. (M49B) 7.03E-09 3.54 607 11.05 946 1.09 330 minimum age of volcanism 8172 2 27.8 3.9 apatite 10. (M49B) 7.03E-09 0.136 283 0.271 565 0.93 9.4 AGE IS TOO OLD 8173 1 21.8 1 zircon 11. (M83) 7.03E-09 4.03 840 12.72 1325 1.15 350 age of volcanism 8173 2 23.7 3.6 apatite 11. (M83) 7.03E-09 0.114 237 0.259 540 0.904 9.2 maximum age of volcanism 8174 1 23.3 2.6 apatite 12. (M27A) 7.03E-09 0.206 429 0.468 976 0.888 17 age of intrusion 8174 2 19 0.8 zircon 12. (M27A) 7.03E-09 8.32 1464 10.95 963 0.418 840 AGE IS TOO YOUNG 8175 1 24.1 1.2 zircon 13. (M98) 7.03E-09 5.34 668 17.12 1070 1.29 430 age of intrusion 8176 1 27 1.2 zircon 14. (75-S-20) 7.03E-09 5.74 903 14.47 1139 1.14 410 age of volcanism 8177 1 27.4 1.3 zircon 15. (M90) 7.03E-09 4.11 762 9.49 879 1.06 290 age of volcanism 8199 1 6.1 0.3 zircon T40-TR-A 6.85E-09 15.39 862 27.58 772 0.18 age of volcanism 4 GRAINS COUNTED "THIS AGE AGREES WITH A 6.0 M.Y. K-AR SANIDINE AGE (ARMSTRONG, 1970, TABLE 3) AND A 6.1 M.Y. K-AR AGE (E.H. MCKEE, ORAL COMMUN., 1975) AND DISAGREES WITH A 16.2 M.Y. K-AR SANIDINE AGE (WHELAN, 1970) ON THE SAME FLOW." 8200 1 6.1 0.3 zircon T52-TR-A 6.85E-09 17.26 794 35.04 806 0.2 age of volcanism 3 GRAINS COUNTED 8201 1 6.3 0.4 zircon T52-TR-B 6.85E-09 6.48 700 12.31 665 0.19 age of volcanism 5 GRAINS COUNTED 8202 1 6.6 0.3 zircon T50-TR-A 6.85E-09 16.45 1053 28.88 924 0.19 age of volcanism 5 GRAINS COUNTED 8203 1 7.8 0.6 sphene K47-TR-A 6.85E-09 0.23 216 2 948 1.11 age of volcanism 10 GRAINS COUNTED 8204 1 8.2 0.5 zircon K39-TR-A 6.85E-09 2.86 480 12.6 1058 0.59 age of volcanism 6 GRAINS COUNTED 8205 1 10.3 0.6 zircon K-49-A 6.85E-09 1.29 409 9.18 1451 1.18 age of volcanism 8 GRAINS COUNTED 8206 1 9.6 0.9 zircon K-49-B 6.85E-09 1.24 154 9.55 592 1.2 age of volcanism 4 GRAINS COUNTED 8207 1 30.8 1.8 zircon DRS-282-63 6.85E-09 6.4 550 13.86 596 1.09 age of intrusion 5 GRAINS COUNTED 8208 1 32.4 1.2 zircon IN-2 6.85E-09 10.11 1375 22.48 1528 1.17 5 GRAINS COUNTED "AGE OF INTRUSIONS IS AROUND 30.3 M.Y. THIS IS IN FAIR AGREEMENT WITH K-AR AGES OF 28.5 AND 26.5 M.Y. (ARMSTRONG, 1970, TABLE 3), BUT NOT IN AGREEMENT WITH PB-ALPHA AGES OF 36 AND 41 M.Y. (WHELAN, 1975) FOR THIS INTRUSION." 8208 2 28.2 2.3 sphene IN-2 6.85E-09 0.83 291 1.95 342 1.08 4 GRAINS COUNTED AGE OF INTRUSION IS AROUND 30.3 M.Y. 8209 1 29.9 3 zircon T43-A 6.85E-09 3.03 188 7.23 224 1.16 2 GRAINS COUNTED "AGE OF TUFF IS AROUND 29.9 M.Y. THIS IS NOT IN AGREEMENT WITH PB-ALPHA AGE OF 20 M.Y. (JAFFE AND OTHERS, 1959, P. 71) FOR THIS TUFF." 8209 2 27.8 1.9 sphene T43-A 6.85E-09 0.39 436 0.76 423 0.88 7 GRAINS COUNTED AGE OF TUFF IS AROUND 29.9 M.Y. 8209 3 31.9 apatite T43-A 6.85E-09 0.32 508 0.61 980 1 50 GRAINS COUNTED AGE OF TUFF IS AROUND 29.9 M.Y. 8210 1 32.2 1.6 zircon T42-A 6.85E-09 10.91 742 24.52 834 1.18 4 GRAINS COUNTED AGE OF THE TUFF IS AROUND 32.1 M.Y. 8210 2 31.6 2.5 sphene T42-A 6.85E-09 1.59 324 3.39 346 1.1 5 GRAINS COUNTED AGE OF THE TUFF IS AROUND 32.1 M.Y. 8210 3 32.5 apatite T42-A 6.85E-09 0.23 420 0.54 976 1.23 50 GRAINS COUNTED AGE OF THE TUFF IS AROUND 32.1 M.Y. 8211 1 13.6 apatite K2O-A 6.85E-09 0.12 194 0.55 874 0.99 50 GRAINS COUNTED THIS IS A REDUCED AGE 8211 2 32.7 2.3 sphene K20-A 6.85E-09 0.34 475 0.57 385 0.9 age of volcanism 7 GRAINS COUNTED 8212 1 32.5 1.2 zircon K48-A 6.85E-09 10.49 1385 23.58 1556 1.19 6 GRAINS COUNTED AGE OF THE TUFF IS AROUND 32.1 M.Y. 8212 2 31.7 2.1 sphene K48-A 6.85E-09 1.72 433 3.72 469 1.12 7 GRAINS COUNTED AGE OF THE TUFF IS AROUND 32.1 M.Y. 8213 1 37.2 1.6 zircon K15-A 6.85E-09 7.2 1037 14 1006 1.17 5 GRAINS COUNTED THE AGE OF THIS SAMPLE IS AROUND 38.5 M.Y. 8213 2 39.7 apatite K15-A 6.85E-09 0.29 524 0.55 992 1.22 50 GRAINS COUNTED THE AGE OF THIS SAMPLE IS AROUND 38.5 M.Y. 8214 1 38.3 1.5 zircon K50-A 6.85E-09 10.83 1451 20.24 1356 1.17 age of volcanism 7 GRAINS COUNTED 8215 1 37.5 2.2 sphene T51-A 6.85E-09 1.68 603 3.12 561 1.14 10 GRAINS COUNTED THE AGE OF THE TUFF IS AROUND 38.3 M.Y. 8215 2 39 apatite T51-A 6.85E-09 0.27 485 0.52 941 1.23 50 GRAINS COUNTED THE AGE OF THE TUFF IS AROUND 38.3 M.Y. 8465 1 28 3 apatite 6.85E-09 185 570 1.397 age of uplift and cooling 8466 1 62 4 apatite JE14-67 6.85E-09 1123 766 1.397 age of uplift and cooling 8467 1 71 5 apatite JE20-67 6.85E-09 688 831 1.397 age of uplift and cooling 8468 1 65 4 apatite JE21-67 6.85E-09 812 900 1.19 age of uplift and cooling 8469 1 57 4 apatite JE22-67 6.85E-09 503 1141 1.397 age of uplift and cooling 8469 2 94 9 allanite JE22-67 6.85E-09 486 213 1.35 AGE OF THE PLUTON IS AROUND 88 M.Y. 8471 1 42 5 apatite RWT18-68 133 136 1.616 age of uplift and cooling 8471 2 84 12 allanite RWT18-68 6.85E-09 141 39 1.53 AGE OF THE PLUTON IS AROUND 88-90 M.Y. 8471 3 98 14 allanite RWT18-68 6.85E-09 153 36.5 1.53 AGE OF THE PLUTON IS AROUND 88-90 M.Y. 8471 4 83 20 epidote RWT18-68 6.85E-09 48 13.5 1.53 AGE OF THE PLUTON IS AROUND 88-90 M.Y. 8472 1 15.5 1.5 Unk (NOT GIVEN) not given age of intrusion NO ANALYTICAL DATA GIVEN 8486 1 89 9 apatite 0K-1 7.03E-09 maximum age of intrusion NO ANALYTICAL DATA GIVEN 8486 2 84 8 sphene OK-1 7.03E-09 age of intrusion NO ANALYTICAL DATA GIVEN 8487 1 56 6 apatite OK-2 7.03E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 8487 2 72 7 sphene OK-2 7.03E-09 NO ANALYTICAL DATA GIVEN THIS IS A REDUCED AGE. 8489 1 94 12 apatite OK-4 7.03E-09 AGE APPEARS TO BE OLD. 8490 1 78 8 sphene OK-5 7.03E-09 NO ANALYTICAL DATA GIVEN AGE IS APPARENTLY TOO YOUNG. 8491 1 92 9 apatite OK-6 7.03E-09 minimum age of metamorphism NO ANALYTICAL DATA GIVEN 8491 2 90 9 zircon OK-6 7.03E-09 minimum age of metamorphism NO ANALYTICAL DATA GIVEN 8940 1 69.3 6.4 apatite (NOT GIVEN) 7.03E-09 0.234 0.233 1.11 5.8 minimum age of intrusion 8941 1 82.4 3.4 sphene (NOT GIVEN) 7.03E-09 5.9 1257 5.32 567 1.25 120 206PB/238U AGE IS 91.4 M.Y. FOR THIS PLUTON 8941 2 79.5 8 apatite (NOT GIVEN) 7.03E-09 0.445 928 0.324 676 0.974 9.6 206PB/238U AGE IS 91.4 M.Y. FOR THIS PLUTON 8941 3 70.8 3.3 zircon (NOT GIVEN) 7.03E-09 10.64 2266 8.71 927 0.973 260 age not evaluated 7 GRAINS POOLED ANALYTICAL RESULTS 8941 4 78 3.1 zircon (NOT GIVEN) 7.03E-09 13.28 1475 9.85 547 0.973 290 age not evaluated 3 GRAINS 8941 5 60.3 2.4 zircon (NOT GIVEN) 7.03E-09 7.77 791 7.46 380 0.973 220 age not evaluated 4 GRAINS 8942 1 47.2 1.9 zircon (NOT GIVEN) 7.03E-09 5.93 884 7.87 587 1.05 220 minimum age of intrusion 8942 2 47.5 3.6 apatite (NOT GIVEN) 7.03E-09 0.59 268 3.96 889 5.34 21 minimum age of intrusion 9066 1 15.5 1.5 apatite (NOT GIVEN) not given age of intrusion NO ANALYTICAL DATA GIVEN 9096 1 145 10 zircon 75-227 7.03E-09 14 1103 6.52 257 1.14 160 age not evaluated 9099 1 113 8 zircon 75-374A 7.03E-09 5.06 958 2.97 282 1.12 76 age not evaluated 9100 1 265 32 zircon 75-92 7.03E-09 21.86 1457 5.46 182 1.13 140 age not evaluated 9101 1 246 45 zircon 68-21 7.03E-09 15.08 731 3.96 96 1.1 100 age not evaluated MATTINSON (1972) OBTAINED A PB-U ZIRCON AGE OF 437+/-10 M.Y. FOR THIS SAMPLE. 9134 1 48.1 2.4 sphene 15 7.03E-09 6.04 1006 6.76 563 0.903 220 minimum age of intrusion 5 GRAINS 9162 1 63.8 3.2 sphene 43 7.03E-09 2.4 700 2.54 724 2.27 age of intrusion THE PLUTON MAY HAVE FORMED ABOUT 64 M.Y. AGO. 9162 2 69.7 10.2 apatite 43 7.03E-09 14.8 370 14.8 370 1.17 THE PLUTON MAY HAVE FORMED ABOUT 64 M.Y. AGO; THIS AGE APPEARS SOMEWHAT OLD. 9162 3 60.8 13.6 zircon 43 7.03E-09 3.13 217 3.42 119 1.12 minimum age of intrusion THE PLUTON MAY HAVE FORMED ABOUT 64 M.Y. AGO. 9163 1 60.7 7.7 apatite 44 7.03E-09 17.3 463 21.3 532 1.17 minimum age of intrusion 9169 1 62.1 6.6 zircon 50 7.03E-09 7.45 1073 7.43 535 1.04 7 ZIRCONS LACCOLITH PROBABLY FORMED 66 M.Y. AGO 9169 2 67.4 9.6 sphene 50 7.03E-09 0.83 297 3.08 555 4.23 10 SPHENES LACCOLITH PROBABLY FORMED 66 M.Y. AGO. 9170 1 64.3 6.4 apatite 51 7.03E-09 0.6 1072 0.51 923 0.93 50 GRAINS LACCOLITH PROBABLY FORMED 66 M.Y. AGO 9170 2 65.5 7.2 zircon 51 7.03E-09 7 1008 6.68 481 1.05 5 ZIRCONS LACCOLITH PROBABLY FORMED 66 M.Y. AGO. 9170 3 70.9 9 sphene 51 7.03E-09 1.06 382 3.81 686 4.28 10 SPHENES LACCOLITH PROBABLY FORMED 66 M.Y. AGO 9171 1 60.5 6.2 zircon 52 7.03E-09 7.22 1126 7.32 571 1.03 6 ZIRCONS ROCK PROBABLY FORMED 66 M.Y. AGO. 9172 1 53.5 6.6 zircon 53 7.03E-09 3.7 732 4.24 420 1.03 6 ZIRCONS AGE PROBABLY DATES THE LATEST TIME OF MINERALIZATION AND HYDROTHERMAL ALTERATION. 9173 1 64.8 6.5 apatite 54 7.03E-09 0.44 789 0.37 667 0.92 50 GRAINS INTRUSIVE COMPLEX PROBABLY FORMED 64 M.Y. AGO. 9173 2 55.6 5.8 zircon 54 7.03E-09 3.62 1012 4.04 565 1.04 6 ZIRCONS INTRUSIVE COMPLEX PROBABLY FORMED 64 M.Y. AGO; THIS ZIRCON AGE IS TOO YOUNG. 9173 3 62.6 7.2 sphene 54 7.03E-09 1.09 433 4.98 986 4.79 11 SPHENES INTRUSIVE COMPLEX PROBABLY FORMED 64 M.Y. AGO. 9174 1 63.7 6.6 sphene 55 7.03E-09 1.53 551 6.91 1244 4.83 10 SPHENES SILL PROBABLY FORMED ABOUT 65 M.Y. AGO. 9175 1 75.4 8.6 zircon 56 7.03E-09 6.91 995 6.06 436 1.11 5 ZIRCONS A SPURIOUS AGE 9177 1 68.4 3.3 zircon 58 7.03E-09 7.45 1379 7.26 672 1.06 210 age of intrusion 9177 2 76.6 3.3 sphene 58 7.03E-09 2.42 1044 3.45 742 1.73 60 THIS ROCK PROBABLY FORMED 69-68 M.Y. AGO; THIS SPHENE AGE IS SPURIOUS. 9178 1 63.6 7.3 zircon 59 7.03E-09 12.2 845 12.6 439 1.11 370 THIS ROCK FORMED 67 M.Y. AGO. 9178 2 82 4 sphene 59 7.03E-09 2.54 847 3.32 553 1.8 60 THIS ROCK FORMED 67 M.Y. AGO; THIS AGE IS SPURIOUS. 9180 1 82.6 4.6 zircon 60 7.03E-09 6 806 4.8 322 1.11 140 THIS PLUTON PROBABLY FORMED ABOUT 67 M.Y. AGO; THIS AGE APPEARS TO BE TOO OLD. 9180 2 81.6 4.2 sphene 60 7.03E-09 1.81 781 2.39 515 1.81 43 THIS PLUTON PROBABLY FORMED ABOUT 67 M.Y. AGO; THIS AGE APPEARS TO BE TOO OLD. 9181 1 73.3 7.7 apatite 61 7.03E-09 0.362 754 0.329 686 1.12 THIS AGE APPEARS TOO OLD; SILL PROBABLY FORMED ABOUT 65 M.Y. AGO. 9205 1 20 10 sphene CC-1 6.85E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9205 2 20 4 apatite CC-1 6.85E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9223 1 46 26 apatite (NOT GIVEN) 6.85E-09 0.4 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9223 2 69 32 apatite (NOT GIVEN) 6.85E-09 0.4 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9224 1 10.2 1.9 sphene (NOT GIVEN) 6.85E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9224 2 12.4 2.4 apatite (NOT GIVEN) 6.85E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9244 1 18.9 6.3 apatite 9W-99-39 6.85E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9245 1 18.3 1.9 zircon 13W-29-11 6.85E-09 age of uplift and cooling NO ANALYTICAL DATA GIVEN 9245 2 13.7 3.7 apatite 13W-29-11 6.85E-09 age meaning uncertain (analysis questionable) NO ANALYTICAL DATA GIVEN 9256 1 10.93 0.88 apatite F4 6.85E-09 46 125 0.979 2 GRAINS AGE DIFFICULT TO INTERPRET 9256 2 45.68 2.78 zircon F4 6.85E-09 997 647 0.979 age of uplift and cooling 3 GRAINS 9257 1 27.19 1.66 apatite G3-1 6.85E-09 109 119 0.979 age of uplift and cooling 6 GRAINS 9257 2 84.92 4.78 zircon G3-1 6.85E-09 457 200 1.22 age of uplift and cooling 4 GRAINS 9331 1 78.6 6.7 apatite 1 7.03E-09 0.287 1195 0.243 1013 1.12 6.3 age of uplift and cooling 9331 2 104 11 sphene 1 7.03E-09 19.79 733 43.84 812 3.87 330 STOCK IS PROBABLY 101 M.Y. OLD 9331 3 101 6.4 zircon 1 7.03E-09 10.99 1628 7.21 534 1.12 190 age of intrusion 9332 1 93.3 6.8 apatite 2 7.03E-09 0.431 1794 0.307 1280 1.12 7.9 STOCK IS PROBABLY 101 M.Y. OLD 9333 1 106 9 apatite 3 7.03E-09 0.327 1362 0.203 845 1.11 5.3 STOCK IS PROBABLY 101 M.Y. OLD. 9334 1 98.3 7.9 apatite 4 7.03E-09 0.372 1552 0.248 1032 1.1 6.5 STOCK IS PROBABLY 101 M.Y. OLD 9335 1 107 9 apatite 5 7.03E-09 0.349 1454 0.212 885 1.1 5.6 STOCK IS PROBABLY 101 M.Y. OLD. 9335 2 100 6.4 zircon 5 7.03E-09 17.36 1366 11.44 450 1.11 300 age of intrusion 9336 1 55.6 5.6 apatite 6 7.03E-09 0.163 681 0.193 803 1.1 5 age of uplift and cooling STOCK IS PROBABLY AROUND 100 M.Y. OLD. 9336 2 93.6 8.5 zircon 7 7.03E-09 13.71 1904 9.58 665 1.1 250 minimum age of intrusion 9622 1 35.1 3.6 zircon 1 7.03E-09 10.4 723 20.4 700 1.09 570 age of intrusion 3 GRAINS 9623 1 38.3 1.8 zircon 2 (222) 7.03E-09 6.08 1188 9 943 1.02 290 age of intrusion 19 GRAINS 9623 2 36.6 2 zircon 2 (222) 7.03E-09 3.39 92 5.32 308 0.965 290 minimum age of intrusion 6 GRAINS 9623 3 36.2 1.6 zircon 2 (222) 7.03E-09 5.22 628 8.44 508 0.98 275 minimum age of intrusion 6 GRAINS 9624 1 38.2 1.8 zircon 2 (466) 7.03E-09 5.55 719 8.76 568 1.01 250 6 GRAINS AGE OF CONTACT METAMORPHISM 9625 1 40.4 1.7 sphene 3 7.03E-09 5.93 1456 11.12 1364 1.27 280 maximum age of intrusion 6 GRAINS 9625 2 37.9 1.6 zircon 3 7.03E-09 3.61 852 6.87 795 1.18 190 age of intrusion 6 GRAINS 9625 3 42.7 8.2 apatite 3 7.03E-09 0.243 113 0.387 118 1.13 11 age not evaluated 50 GRAINS 9626 1 39.9 2 sphene 4 7.03E-09 2.1 670 3.92 626 1.25 100 maximum age of intrusion 6 GRAINS 9626 2 35.5 1.4 zircon 4 7.03E-09 5.56 1055 10.68 1014 1.14 300 age of intrusion 6 GRAINS 9626 3 41.1 10 apatite 4 7.03E-09 0.144 134 0.238 220 1.13 6.8 maximum age of intrusion 50 GRAINS 9627 1 40.3 1.8 zircon 5 (503) 7.03E-09 7.76 1149 12.3 911 1.07 330 age of intrusion 6 GRAINS 9627 2 40.6 5.8 apatite 5 (503) 7.03E-09 0.159 331 0.239 497 0.997 6.9 age of intrusion 50 GRAINS 9629 1 41.5 1.8 zircon 6 7.03E-09 4.24 610 6.59 474 1.08 180 age of intrusion 6 GRAINS 9630 1 37.6 1.5 zircon 7 7.03E-09 4.09 910 8.32 924 1.28 190 age of intrusion 6 GRAINS 9630 2 56.4 7.4 apatite 7 7.03E-09 0.108 450 0.116 485 1.02 3.3 100 GRAINS APATITE HAS MANY CRYSTAL DEFECTS AGE IS SPURIOUS 9631 1 41.5 1.8 zircon 8 7.03E-09 3.62 787 5.41 589 1.04 150 age of volcanism 6 GRAINS 9631 2 42.8 5.1 apatite 8 7.03E-09 0.115 479 0.16 667 1 4.6 age of volcanism 100 GRAINS 9632 1 36.4 1.9 zircon 9 7.03E-09 4.75 1122 8.8 1039 1.13 220 age of volcanism 6 GRAINS 9633 1 55.5 2.7 zircon 10 7.03E-09 6.35 912 7.16 514 1.05 200 age of volcanism 6 GRAINS 9633 2 66.5 11.6 apatite 10 7.03E-09 0.149 275 0.136 251 1.02 3.8 age not evaluated 100 GRAINS 9634 1 54.7 4.8 zircon 11 7.03E-09 8.12 1240 10.38 793 1.17 280 age of volcanism 6 GRAINS 9634 2 66.4 12 apatite 11 7.03E-09 0.162 337 0.164 342 1.13 4.7 age not evaluated 50 GRAINS 9635 1 64.1 3.7 zircon 12 7.03E-09 10.3 1045 9.82 500 1.03 270 age of volcanism 4 GRAINS 9635 2 59.3 8.1 apatite 12 7.03E-09 0.102 427 0.102 425 0.99 3 age of volcanism 100 GRAINS 9636 1 60.9 3.2 zircon 13 7.03E-09 5.12 1208 5.25 620 1.05 140 age of volcanism 6 GRAINS 9636 2 63.3 8.5 apatite 13 7.03E-09 0.11 457 0.104 434 1.01 3 maximum age of volcanism 100 GRAINS 9736 1 0.84 0.21 zircon DF2733-3 7.03E-09 0.12 15 7.86 504 0.946 age of volcanism 10 GRAINS 9737 1 0.66 0.04 glass TF-24 7.03E-09 656 340 0.13 10073 2.15 AGE IS TOO YOUNG. 9738 1 0.87 0.27 zircon DF2734 7.03E-09 0.09 9 5.59 292 0.946 age of volcanism 7 GRAINS 9791 1 60 zircon (NOT GIVEN) not given age of intrusion NO ANALYTICAL DATA GIVEN 10057 1 1.39 0.11 zircon 77G55 (1646) 7.03E-09 0.423 45 19.14 1019 1.05 520 AGE IS PROBABLY 1.47 M.Y. 10057 2 1.46 0.12 zircon 77G55 (1646A) 7.03E-09 0.374 71 7.55 717 0.493 440 age of volcanism 11048 1 23.3 3.7 zircon 2 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11050 1 23.5 2.5 zircon 4 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11051 1 9.1 1 zircon 5 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11051 2 8.2 1.4 glass 5 6.85E-09 NO ANALYTICAL DATA GIVEN THIS DATE IS TOO YOUNG 11053 1 apatite 7 6.85E-09 SEVERAL SAMPLES OF APATITE DATED AGES FROM 7.5-10.0 M.Y. DETERMINED; NO ANALYTICAL DATA GIVEN MINIMUM AGES FOR THE DIATREMES. 11057 1 11.2 1.8 zircon 1 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11057 2 8.3 1.2 glass 1 6.85E-09 NO ANALYTICAL DATA GIVEN THIS DATE IS TOO YOUNG 11058 1 12.8 2 zircon 2 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11058 2 10.9 1.4 glass 2 6.85E-09 NO ANALYTICAL DATA GIVEN THIS DATE IS TOO YOUNG 11059 1 18 2 zircon 3 6.85E-09 minimum age of volcanism NO ANALYTICAL DATA GIVEN 11059 2 20 2.3 sphene 3 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11061 1 16.1 3.7 zircon (NOT GIVEN) 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11062 1 4.6 1 zircon (NOT GIVEN) 6.85E-09 age of volcanism 11063 1 9.7 1.2 zircon (NOT GIVEN) 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11063 2 7.5 2.2 glass (NOT GIVEN) 6.85E-09 NO ANALYTICAL DATA GIVEN THIS DATE IS TOO YOUNG 11064 1 6.6 0.8 zircon (NOT GIVEN) 6.85E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11064 2 4.7 0.8 glass (NOT GIVEN) 6.85E-09 THIS DATE IS TOO YOUNG 11074 1 78.4 3.3 sphene RICO 1 7.03E-09 8.46 1645 12.15 1181 1.89 210 minimum age of intrusion 6 GRAINS ANALYZED 11074 2 61.4 2.9 zircon RICO 1 7.03E-09 4.78 1174 4.86 596 1.04 150 6 GRAINS ANALYZED AGE HAS BEEN LOWERED BY A RECENT(?) THERMAL EVENT 11074 3 6.6 2.3 apatite RICO 1 7.03E-09 0.016 34 0.169 353 1.14 4.8 50 GRAINS ANALYZED DATE MAY INDICATE THE AGE OF A RECENT THERMAL EVENT 11075 1 64.9 2.9 zircon RICO 2 7.03E-09 9.89 2151 9.72 1058 1.07 290 minimum age of intrusion 6 GRAINS ANALYZED 11075 2 20.2 7.4 apatite RICO 2 7.03E-09 0.017 36 0.038 121 1.14 1.6 50 GRAINS ANALYZED AGE REDUCED BY SOME THERMAL EVENT 11076 1 64.9 3.7 zircon RICO 3 7.03E-09 11.77 1835 10.75 838 0.996 310 minimum age of intrusion 6 GRAINS ANALYZED 11076 2 10.3 4.1 apatite RICO 3 7.03E-09 0.01 29 0.058 162 0.961 1.7 50 GRAINS ANALYZED AGE REDUCED BY SOME THERMAL EVENT 11077 1 34.3 1.5 zircon RICO 4 7.03E-09 6.12 850 10.58 735 0.994 310 AGE IS PROBABLY TOO YOUNG; DIKE MAY BE ABOUT 64 M.Y. OLD 11077 2 4.6 2.9 apatite RICO 4 7.03E-09 0.004 11 0.049 137 0.961 1.5 50 GRAINS ANALYZED AGE MAY INDICATE THE TIME OF THE MOST RECENT THERMAL EVENT 11078 1 6.8 0.6 zircon RICO 5 7.03E-09 1.29 219 11.29 957 0.991 330 6 GRAINS ANALYZED AGE MAY INDICATE TIME OF SOME RECENT THERMAL EVENT; DIKE IS PROBABLY ABOUT 64 M.Y. OLD. 11078 2 7 3.3 apatite RICO 5 7.03E-09 0.007 20 0.059 165 0.961 1.8 50 GRAINS ANALYZED AGE MAY INDICATE THE TIME OF A RECENT THERMAL EVENT 11079 1 59.9 2.7 zircon RICO 6 7.03E-09 10.74 1856 10.56 913 0.989 310 minimum age of intrusion 6 GRAINS ANALYZED 11079 2 7.8 3.7 apatite RICO 6 7.03E-09 0.007 20 0.053 148 0.961 1.6 50 GRAINS ANALYZED AGE MAY INDICATE THE APPROXIMATE TIME OF THE MOST RECENT THERMAL EVENT 11080 1 38.6 1.5 zircon RICO 9 7.03E-09 9.74 1650 14.82 1256 0.986 430 THIS AGE HAS BEEN REDUCED BY A RECENT THERMAL EVENT; DIKE IS PROBABLY AROUND 64 M.Y. OLD. 11080 2 5.6 3.2 apatite RICO 9 7.03E-09 0.005 14 0.051 143 0.961 1.5 50 GRAINS ANALYZED AGE PROBABLY INDICATES THE TIME OF THE MOST RECENT THERMAL EVENT. 11081 1 4.1 0.4 zircon RICO 10 7.03E-09 1.45 271 21.04 1961 0.984 620 age of intrusion 6 GRAINS ANALYZED 11082 1 5.6 0.5 zircon RICO 11 7.03E-09 0.865 170 9 885 0.982 260 age of intrusion 6 GRAINS ANALYZED 11083 1 4 0.4 zircon RICO 14 7.03E-09 0.931 221 13.42 1592 0.975 400 age of intrusion 6 GRAINS ANALYZED 11083 2 6.1 1.5 apatite RICO 14 7.03E-09 0.027 77 0.258 725 0.961 7.7 maximum age of intrusion 50 GRAINS ANALYZED 11084 1 3.4 0.3 zircon RICO 12 7.03E-09 1.12 209 19.6 1827 0.979 580 age of intrusion 6 GRAINS ANALYZED 11085 1 3.9 0.4 zircon RICO 13 7.03E-09 1.08 147 16.21 1099 0.977 480 age of intrusion 6 GRAINS ANALYZED 11167 1 68.5 5 apatite 1 7.03E-09 0.351 1462 0.357 1487 1.17 9.8 age of uplift and cooling 100 GRAINS ANALYZED 11168 1 66.5 4 apatite 2 7.03E-09 0.51 2123 0.534 2226 1.17 15 age of uplift and cooling 100 GRAINS ANALYZED 11169 1 57.8 8.7 apatite 3 7.03E-09 0.747 346 0.786 364 1.02 22 age of uplift and cooling 100 GRAINS ANALYZED 11170 1 98 5 apatite 4 7.03E-09 0.909 3786 0.646 2690 1.17 18 age of uplift and cooling 100 GRAINS ANALYZED 11171 1 90.2 12.7 apatite 5 7.03E-09 1.08 500 0.726 336 1.02 20 age of uplift and cooling 100 GRAINS ANALYZED; GRAINS HAVE MANY DEFECTS AGE IS ONLY AN APPROXIMATE AGE 11172 1 134 7 apatite 6 7.03E-09 0.938 3909 0.449 2020 1.17 13 age of uplift and cooling 100 GRAINS ANALYZED 11173 1 45.1 5.9 apatite 7 7.03E-09 0.624 289 2.69 1245 3.26 24 100 GRAINS ANALYZED AGE PROBABLY AFFECTED BY NEARBY MID-TERTIARY INTRUSION 11174 1 79 38 apatite 8 7.03E-09 0.0096 40 0.0072 30 1 0.2 age of uplift and cooling 100 GRAINS ANALYZED 11175 1 49.8 4 apatite 9 7.03E-09 0.274 1141 0.338 1407 1.03 9.4 100 GRAINS ANALYZED AGE WAS PROBABLY AFFECTED BY NEARBY MID-TERTIARY IGNEOUS INTRUSION 11176 1 148 19 apatite 10 7.03E-09 1.72 798 0.782 362 1.11 20 age of uplift and cooling 50 GRAINS ANALYZED 11177 1 124 18 apatite 11 7.03E-09 0.583 540 0.317 294 1.11 8.2 age of uplift and cooling 50 GRAINS ANALYZED 11178 1 130 25 apatite 12 7.03E-09 0.161 335 0.081 169 1.11 2.1 age of uplift and cooling 50 GRAINS ANALYZED 11179 1 245 30 apatite 13 7.03E-09 0.642 1338 0.16 334 0.971 4.4 age of uplift and cooling 50 GRAINS ANALYZED 11180 1 473 100 apatite 14 7.03E-09 0.806 746 0.109 101 1.11 2.8 age of uplift and cooling 50 GRAINS ANALYZED 11181 1 352 18 apatite 15 7.03E-09 4.53 881 4.43 431 5.91 22 age of uplift and cooling 6 GRAINS ANALYZED 11182 1 52.5 12.8 apatite 16 7.03E-09 0.278 124 0.313 145 1.03 8.8 age of uplift and cooling "100 GRAINS ANALYZED, APATITE HAS MANY DEFECTS" AN APPROXIMATE AGE 11183 1 51.1 5.5 apatite 17 7.03E-09 0.345 639 0.407 753 1.01 12 age of uplift and cooling 100 GRAINS ANALYZED 11184 1 27.9 3.9 apatite 18 7.03E-09 0.072 299 0.156 652 1.02 4.4 age of uplift and cooling 100 GRAINS ANALYZED THIS MAY BE AN AREA WITH A HIGH GEOTHERMAL GRADIENT. 11185 1 29.9 4.2 apatite 19 7.03E-09 0.126 262 0.432 900 1.72 7 age of uplift and cooling 50 GRAINS ANALYZED THIS MAY BE AN AREA WITH A HIGH GEOTHERMAL GRADIENT 11186 1 19.9 4.4 apatite 20 7.03E-09 0.047 98 0.243 507 1.72 4 age of uplift and cooling 50 GRAINS ANALYZED THIS MAY BE AN AREA WITH HIGH GEOTHERMAL GRADIENT 11187 1 20 2.9 apatite 21 7.03E-09 1.08 225 3.75 782 1.17 11 age of uplift and cooling 50 GRAINS ANALYZED THIS MAY BE AN AREA WITH A HIGH GEOTHERMAL GRADIENT 11188 1 16 2.4 apatite 22 7.03E-09 0.096 199 0.61 1270 1.71 10 age of uplift and cooling 50 GRAINS ANALYZED THIS MAY BE AN AREA WITH A HIGH GEOTHERMAL GRADIENT 11623 1 29.5 2.8 zircon 639 not given age of volcanism NO ANALYTICAL DATA GIVEN 11811 1 38.6 1.5 zircon 1. 77T22 7.03E-09 1535 2102 0.888 age of volcanism 11812 1 37.7 1.8 zircon 2. 76T5 7.03E-09 1090 1530 0.884 age of volcanism THIS AGE IS A BIT OLDER THAN THE K-AR AGE 11813 1 33.2 1.7 zircon 3. 76T193 7.03E-09 896 1420 0.878 age of volcanism 11814 1 32.4 1.7 zircon 4. 77T20 7.03E-09 806 1276 0.855 age of volcanism 11815 1 32.7 1.9 zircon 5. J-218 7.03E-09 596 1170 1.07 age of volcanism 11817 1 31.3 2.6 zircon 7. T-417 7.03E-09 325 556 0.894 age of volcanism 11818 1 30.5 1.9 zircon 8. J-53 7.03E-09 480 1028 1.09 age of volcanism 11819 1 30.3 2.6 zircon 9. T-384A 7.03E-09 187 388 1.05 7.03 age of volcanism 11821 1 29.3 1.7 zircon 11. T-249 7.03E-09 579 1220 1.03 age of volcanism 11841 1 6.72 0.74 whole rock 1280D 7.00E-09 A NEW FISSION-TRACK METHOD INVOLVING VARIATION OF TRACK DENSITY WITH NEUTRON FLUENCE. SEE ARTICLE FOR ANALYTICAL DATA THIS AGE MAY INDICATE TIME OF MINERALIZATION OR THE AVERAGE URANIUM RESIDENCE TIME 11842 1 6.61 0.72 whole rock ML-6 7.00E-09 A NEW FISSION-TRACK METHOD INVOLVING VARIATION OF TRACK DENSITY WITH NEUTRON FLUENCE. SEE ARTICLE FOR ANALYTICAL DATA THIS AGE MAY INDICATE TIME OF MINERALIZATION OR THE AVERAGE URANIUM RESIDENCE TIME 11855 1 19.8 1.2 zircon M330 7.03E-09 17.51 1135 31.72 1028 0.599 "1,500.00" age of intrusion 11855 2 13.4 2.7 apatite M330 7.03E-09 0.122 254 0.589 1227 1.08 16 DATE REFLECTS A LATER THERMAL EVENT 11856 1 9.5 1.9 apatite M335 7.03E-09 0.081 169 0.552 1151 1.08 15 DATE REFLECTS A LATE THERMAL EVENT; DIKE IS PROBABLY 20 M.Y. OLD 11857 1 20.3 0.9 zircon M336 7.03E-09 3.27 605 5.72 530 0.596 280 age of intrusion 11858 1 15.6 1.1 zircon M733 7.03E-09 3.86 536 14.75 1024 1 420 A RESET AGE; POSSIBLY REFLECTING A 16 M.Y. MINERALIZATION EVENT 11859 1 8.4 0.6 zircon M735 7.03E-09 1.84 315 12.84 1100 0.985 380 age of volcanism 11860 1 19.3 1 zircon M743 7.03E-09 6.41 890 19.43 1349 0.978 570 age of intrusion 11860 2 12.8 2.1 apatite M743 7.03E-09 0.08 166 0.392 816 1.05 11 DATE REFLECTS A LATER THERMAL EVENT; PLUTON IS PROBABLY 20 M.Y. OLD 11861 1 16.1 0.8 zircon M744 7.03E-09 5.41 651 19.47 1172 0.969 540 A RESET AGE; POSSIBLY REFLECTING A 16 M.Y. MINERALIZATION EVENT 11878 1 49.1 5.2 zircon RWT-512-75 7.03E-09 age of volcanism "NO ANALYTICAL DATA GIVEN; SAMPLE NUMBER FROM TABOR AND OTHERS, 1982, USGS MAP I-1311" 11881 1 33.4 1.4 zircon LS-6C 7.03E-09 7.08 1180 13.18 1095 1.04 400 age of volcanism 6 GRAINS COUNTED 11882 1 49.1 2.3 zircon MS-4C 7.03E-09 5.11 1491 6.51 950 1.05 200 8 GRAINS COUNTED CALCULATED AGE IS TOO OLD; OLDER DETRIDAL ZIRCONS MAY BE PRESENT 11883 1 34.5 1.2 zircon 27A 7.03E-09 2.28 666 6.05 882 1.53 130 age of volcanism 5 GRAINS COUNTED 11883 2 39.8 9 apatite 27A 7.03E-09 0.0523 109 0.1138 237 1.45 2.5 50 GRAINS COUNTED URANIUM CONTENT IS VERY LOW 11884 1 41.9 6.8 zircon 75-211 7.03E-09 3.34 278 6.98 291 1.47 150 age of volcanism 3 GRAINS COUNTED 11885 1 42.7 5.1 zircon 75-209 7.03E-09 4.85 516 10.91 537 1.49 220 age of volcanism 3 GRAINS COUNTED 11886 1 48.8 7.2 zircon 75-202 7.03E-09 5.98 360 10.97 330 1.5 240 maximum age of volcanism 2 GRAINS COUNTED 11887 1 42.7 3.7 zircon 75-215 7.03E-09 5.8 886 12 917 1.48 260 age of volcanism 2 GRAINS COUNTED 11888 1 46.4 1.9 zircon 75-191 7.03E-09 5.17 766 10.11 749 1.52 210 age of volcanism 5 GRAINS COUNTED 11889 1 42.7 1.5 zircon 75-200 7.03E-09 8.65 881 18.26 930 1.51 390 minimum age of volcanism 5 GRAINS COUNTED 11890 1 46.1 1.9 zircon 75-124C 7.03E-09 11.6 1315 16.2 936 1.1 470 age of volcanism 5 GRAINS COUNTED 11891 1 46.2 1.8 zircon 75-X 7.03E-09 855 805 1.46 age of volcanism 4 GRAINS COUNTED 11892 1 44.4 2.6 zircon 76-67 7.03E-09 6.28 669 9.37 499 1.11 240 age of volcanism 7 GRAINS COUNTED 11892 2 15.1 3 apatite 76-67 7.03E-09 0.368 1532 1.255 2614 0.86 42 50 GRAINS COUNTED TUFF IS PROBABLY ABOUT 45 M.Y. OLD 11894 1 36.9 2.1 zircon 79-252 7.03E-09 4.19 621 7.11 527 1.05 200 age of volcanism 11896 1 49.1 5.2 zircon 3. RWT-512-75 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11897 1 50.5 1.2 zircon 4. VF-77-101 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11898 1 43.6 1.1 zircon 5. ER-76-75 7.03E-09 NO ANALYTICAL DATA GIVEN DATE APPEARS TO BE TOO YOUNG; PROBABLY 50 M.Y. OLD 11899 1 48.6 2.3 zircon 6. VF-76-450 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11903 1 55.3 3 zircon 10. R-8 7.03E-09 NO ANALYTICAL DATA GIVEN AGE IS TOO OLD; OLDER ZIRCONS MAY BE PRESENT; AGE IS AROUND 20 M.Y. 11904 1 20 0.8 zircon 11. R-7 7.03E-09 age of intrusion NO ANALYTICAL DATA GIVEN 11907 1 51.4 2.8 zircon 14. R-90 7.03E-09 NO ANALYTICAL DATA GIVEN AGE IS TOO OLD; OLDER ZIRCONS MAY BE PRESENT 11908 1 46.2 1.1 zircon 15. RWT 469A-76 7.03E-09 NO ANALYTICAL DATA GIVEN AGE APPEARS TO BE TOO YOUNG 11909 1 51.8 1 zircon 16. VF-77-305 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11912 1 34.4 2.3 zircon 19. R-42 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11913 1 32.8 0.6 zircon 20. RWT-644-77 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11914 1 35.6 20.3 apatite 21. VF-77-149 7.03E-09 age of volcanism VERY LOW U CONCENTRATION; NO ANALYTICAL DATA GIVEN 11920 1 4.4 0.3 zircon 32. RBW-77.988 7.03E-09 age of volcanism NO ANALYTICAL DATA GIVEN 11921 1 3.64 0.74 zircon DF-743 6.85E-09 0.553 32 16.6 482 1.79 280 age of volcanism 4 GRAINS COUNTED 11922 1 3.7 0.2 zircon DF-1047 6.85E-09 0.635 147 11.1 1280 1.05 320 age of volcanism 6 GRAINS COUNTED "TABOR AND OTHERS, 1982, REPORTED THIS AGE AS 3.8+/-0.3 M.Y. (LAMBDA-F=7.03XE-17/YR)" 11923 1 9.5 1.9 apatite M335 0.081 169 0.552 1151 1.08 15 50 GRAINS COUNTED A COOLING AGE; DIKE IS PROBABLY 20 M.Y. OLD 11924 1 20.3 0.9 zircon M336 3.27 605 5.72 530 0.596 280 age of intrusion 6 GRAINS COUNTED 11925 1 25.9 1.2 zircon (NOT GIVEN) 2.35 526 4.46 501 0.826 age of volcanism 10 GRAINS COUNTED 11925 2 27.8 6.8 apatite (NOT GIVEN) 0.0686 247 0.159 571 1.08 maximum age of volcanism 100 GRAINS COUNTED 12019 1 18 zircon 7 age of volcanism NO ANALYTICAL DATA GIVEN "LAURSEN AND HAMMOND, 1978, REPORTED A K-AR AGE OF 12 M.Y. FOR THIS TUFF." 12021 1 21.9 1.2 zircon M286 5.72 874 16.73 1278 1.07 450 age of intrusion 12121 1 47 4 apatite 27. VF-79-531 age of volcanism NO ANALYTICAL DATA GIVEN 12250 1 2.97 0.28 zircon 43. 9-8-11 0.71 217 14 2088 0.959 WEIGHTED-MEAN AGE IS 2.99+/-0.20 M.Y. 12250 2 2.9 0.2 zircon 43. 9-8-11 0.53 390 11 3754 0.959 WEIGHTED-MEAN AGE IS 2.99+/-0.20 M.Y. 12395 1 88 6 zircon 13. H79TM-196 4.452 316 14.74 523 4.9 age of uplift and cooling 2 GRAINS 12410 1 26.7 3.5 zircon 1. 74L-12 1.71 373 6.81 741 1.79 115 minimum age of intrusion 12411 1 32.5 4.6 zircon 2. 74L-4 5.73 398 11.96 416 1.11 330 age of intrusion 12416 1 11 1.2 zircon 7. IDA-136 32.1 707 50.1 551 0.3 "5,500.00" age of intrusion 12417 1 14.7 2 zircon 8. 74L-3 1.84 306 8.71 726 1.14 230 age of intrusion 12418 1 23 2.2 zircon 9. NB-BI 9.76 768 28.6 1126 1.1 790 minimum age of intrusion 12418 2 12.9 2.6 apatite 9. NB-BI 0.164 341 1 2091 1.29 24 age of uplift and cooling 12419 1 21.4 2.4 zircon 10. CS-21 7.27 505 22.3 773 1.07 630 age of intrusion 12419 2 12.3 2.5 apatite 10. CS-21 0.165 344 1.05 2196 1.28 25 age of uplift and cooling 12420 1 15.9 1.5 zircon 11. 73L-104 4.09 701 15.6 1304 0.99 480 age of intrusion 12420 2 16.8 2.6 sphene 11. 73L-104 1.02 256 3.96 495 1.06 110 age of intrusion 12420 3 7.7 1.5 apatite 11. 73L-104 0.0509 106 0.465 968 1.15 12 age of uplift and cooling 12421 1 21.8 2.1 zircon 12. 73L-103 7.62 741 23.1 1123 1.08 650 age of intrusion 12421 2 16.8 3.4 apatite 12. 73L-103 0.182 380 0.852 1774 1.28 20 age of uplift and cooling 12422 1 17.3 2.1 zircon 13. 73L-101 3.72 396 14.4 765 1.09 400 maximum age of intrusion 12422 2 11.8 2.4 apatite 13. 73L-101 0.06 125 0.402 838 1.29 9.5 age of uplift and cooling 12424 1 30.2 zircon (NOT GIVEN) age of intrusion NO ANALYTICAL DATA GIVEN 12425 1 21.6 zircon (NOT GIVEN) age of intrusion NO ANALYTICAL DATA GIVEN 12426 1 23.3 zircon (NOT GIVEN) age of intrusion 12534 1 0.8 0.1 zircon 14. AR-SP 159 257 14.4 1167 0.122 age of volcanism 12535 1 0.84 0.42 zircon 15 1.17 15 7.86 504 0.946 age of volcanism 12537 1 1.48 0.56 zircon 28. OJD-67-4 1.31 20 5.38 411 1.02 age of volcanism 12539 1 2.2 0.3 zircon 41. OJD-67-17 3.64 32 9.55 420 0.958 age of volcanism 12540 1 2.32 0.15 zircon 46. 79W211 2.95 60 7.39 1598 0.976 age of volcanism 12541 1 3.53 0.68 zircon 64. 73W66 8.2 88 15.4 1650 1.11 age of volcanism 12542 1 3.75 0.36 zircon 65. 60M59 19.3 219 9.13 1034 0.296 age of volcanism 12602 1 318 13 zircon C2-Z1 5.5 881 1.8 142 2.11 3 GRAINS A COOLING AGE--TEMPERATURE PROBABLY DECREASED TO LESS THAN 175-DEGREES C ABOUT 325 M.Y. AGO 12603 1 123 4 apatite C-2R 1.9 1078 1.6 458 2.11 5 GRAINS A COOLING AGE--TEMPERATURE BECAME LESS THAN 120-DEGREES C ABOUT 125 M.Y. AGO 12604 1 1.4 0.2 glass (NOT GIVEN) 30 164 GLASS SHARDS SCARCE ANALYTICAL DATA "AGE IS TOO YOUNG; IZETT, 1981, REPORTED AN AGE OF 2.32 M.Y. FOR A ZIRCON SEPERATE FROM THIS ASH" 12669 1 147 10 apatite AN-27 0.69 1108 0.49 779 2.11 6.8 age of uplift and cooling 12670 1 137 12 apatite AN-3 0.32 511 0.24 389 2.11 3.3 age of uplift and cooling 12671 1 125 4 apatite F-4A 0.46 737 0.39 616 2.11 5.4 age of uplift and cooling 12672 1 107 10 apatite W-2A 0.67 1073 0.65 1047 2.11 9 age of uplift and cooling 12673 1 86 12 apatite W-2B 0.41 450 0.5 549 2.11 6.9 age of uplift and cooling 12686 1 367 15 sphene (NOT GIVEN) 3874 1549 1.25 5.05 age of intrusion 6 GRAINS COUNTED 12686 2 77.1 5 apatite (NOT GIVEN) 418 831 0.25 4.86 age of uplift and cooling 6 GRAINS COUNTED 12687 1 377 9 zircon (NOT GIVEN) age of intrusion NO ANALYTICAL DATA GIVEN "THIS AGE ALSO REPORTED BY NAESER AND MCCALLUM, 1977" 12699 1 60.5 8.8 zircon (NOT GIVEN) 12.57 640 10.3 261 0.828 3 GRAINS COUNTED ROCK IS PROBABLY 56 M.Y. OLD 12700 1 131 10 apatite 157 2.1 1.05 1.11 age of intrusion 12701 1 125 9 apatite 485 2.03 1.1 1.11 age of intrusion 12701 2 130 12 zircon 485 7.18 4.61 1.38 age of intrusion 12701 3 129 16 zircon 485 6.16 4.02 1.38 age of intrusion 12702 1 106 5 apatite 3 1.03 0.667 1.13 age of intrusion 12703 1 106 5 apatite 459 1.58 1.03 1.13 age of intrusion 12947 1 128 13 apatite ST minimum age of intrusion NO ANALYTICAL DATA GIVEN 12948 1 125 13 apatite FD-20 minimum age of intrusion NO ANALYTICAL DATA GIVEN 12948 2 114 11 garnet group FD-20 age not evaluated GARNET IS FROM PEGMATITE INTRUDING THE GRANODIORITE NO ANALYTICAL DATA GIVEN 12949 1 106 11 apatite SJ minimum age of intrusion NO ANALYTICAL DATA GIVEN 12950 1 101 10 apatite CL-1 NO ANALYTICAL DATA GIVEN "BIOTITE 113 M.Y., HORNBLENDE 121 M.Y., REPORTED BY KISTLER AND DODGE, 1966; PLAGIOCLASE 105 M.Y., AUGITE 96 M.Y., HYPERSTHENE 48 M.DY., REPORTED BY KISTLER AND OTHERS, 1965" 12951 1 82 8 apatite SITE 26 age of uplift and cooling NO ANALYTICAL DATA GIVEN 12951 2 96 10 sphene SITE 26 age of intrusion NO ANALYTICAL DATA GIVEN 12952 1 89 9 apatite SITE 25 minimum age of intrusion NO ANALYTICAL DATA GIVEN 12953 1 97 10 sphene SITE 24 age of intrusion NO ANALYTICAL DATA GIVEN 12954 1 78 8 apatite JB age of uplift and cooling NO ANALYTICAL DATA GIVEN 12954 2 99 10 sphene JB age of intrusion NO ANALYTICAL DATA GIVEN 12955 1 79 8 apatite SL minimum age of intrusion NO ANALYTICAL DATA GIVEN 12955 2 87 9 sphene SL age of intrusion NO ANALYTICAL DATA GIVEN 12956 1 88 9 sphene SL-18 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 92 M.Y., HORNBLENDE 91 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12957 1 95 10 apatite BCC-13 maximum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 83 M.Y., HORNBLENDE 92 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12957 2 85 9 sphene BCC-13 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 83 M.Y., HORNBLENDE 92 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12958 1 90 9 sphene HL-4 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 82 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12959 1 74 7 apatite HL-29 age of uplift and cooling NO ANALYTICAL DATA GIVEN "BIOTITE 83 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12960 1 91 9 apatite BCC-12 maximum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 87 M.Y., HORNBLENDE 86 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12960 2 83 8 sphene BCC-12 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 87 M.Y., HORNBLENDE 86 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12961 1 77 8 apatite HC NO ANALYTICAL DATA GIVEN THIS AGE APPEARS TO BE TOO YOUNG FOR THE MOUNT GIVENS GRANODIORITE 12961 2 77 8 sphene HC NO ANALYTICAL DATA GIVEN THIS AGE APPEARS TO BE TOO YOUNG FOR THE MOUNT GIVENS GRANODIORITE 12962 1 84 8 apatite BCA-20 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 85 M.Y., HORNBLENDE 87 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12962 2 87 9 sphene BCA-20 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 85 M.Y., HORNBLENDE 87 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12963 1 72 7 apatite M-535 age of uplift and cooling NO ANALYTICAL DATA GIVEN 12963 2 89 9 sphene M-535 age of intrusion NO ANALYTICAL DATA GIVEN 12964 1 91 9 apatite KR minimum age of intrusion NO ANALYTICAL DATA GIVEN 12965 1 82 8 apatite M-133 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 81 M.Y., REPORTED BY DODGE AND MOORE, 1968" 12965 2 75 8 sphene M-133 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 81 M.Y. REPORTED BY DODGE AND MOORE, 1968" 12966 1 75 8 sphene M-131 minimum age of intrusion NO ANALYTICAL DATA GIVEN 12967 1 72 7 apatite P-6 age not evaluated NO ANALYTICAL DATA GIVEN 12967 2 80 8 sphene P-6 age not evaluated NO ANALYTICAL DATA GIVEN 12968 1 88 9 apatite B-15 age not evaluated NO ANALYTICAL DATA GIVEN 12968 2 82 8 sphene B-15 age not evaluated NO ANALYTICAL DATA GIVEN 12969 1 72 7 apatite R-70 age not evaluated NO ANALYTICAL DATA GIVEN 12969 2 97 10 sphene R-70 age not evaluated NO ANALYTICAL DATA GIVEN 12970 1 80 8 apatite P-4A age of intrusion NO ANALYTICAL DATA GIVEN 12970 2 73 7 sphene P-4A minimum age of intrusion NO ANALYTICAL DATA GIVEN 12971 1 68 7 apatite R-97 NO ANALYTICAL DATA GIVEN "THIS AGE APPEARS TO BE TOO YOUNG, LAMARCK GRANODIORITE IS PROBABLY 84 M.Y. OLD" 12971 2 75 8 sphene R-97 NO ANALYTICAL DATA GIVEN "THIS AGE APPEARS TO BE TOO YOUNG, LAMARCK GRANODIORITE IS PROBABLY 84 M.Y. OLD" 12972 1 75 8 apatite R-96 NO ANALYTICAL DATA GIVEN "THIS AGE APPEARS TO BE TOO YOUNG, LAMARCK GRANODIORITE IS PROBABLY 84 M.Y. OLD" 12972 2 81 8 sphene R-96 minimum age of intrusion NO ANALYTICAL DATA GIVEN 12973 1 70 7 apatite P-1 NO ANALYTICAL DATA GIVEN "THIS AGE APPEARS TO BE TOO YOUNG, LAMARCK GRANODIORITE IS PROBABLY 84 M.Y. OLD" 12973 2 71 7 sphene P-1 NO ANALYTICAL DATA GIVEN "THIS AGE APPEARS TO BE TOO YOUNG, LAMARCK GRANODIORITE IS PROBABLY 84 M.Y. OLD" 12974 1 87 9 apatite MG-1 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 77 M.Y., HORNBLENDE 84 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12974 2 90 9 sphene MG-1 maximum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 77 M.Y., HORNBLENDE 84 M.Y., REPORTED BY KISTLER AND OTHERS, 1965" 12974 3 86 9 allanite MG-1 age of intrusion NO ANALYTICAL DATA GIVEN "EPIDOTE GAVE 84 M.Y. FISSION-TRACK AGE. BIOTITE 77 M.Y., HORNBLENDE 84 M.Y. ARE K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965." 12975 1 83 8 apatite R-120 age not evaluated NO ANALYTICAL DATA GIVEN 12975 2 72 7 sphene R-120 age not evaluated NO ANALYTICAL DATA GIVEN 12976 1 87 9 apatite 13240 NO ANALYTICAL DATA GIVEN PROBABLY A REDUCED AGE 12977 1 76 8 apatite 12520 NO ANALYTICAL DATA GIVEN PROBABLY A REDUCED AGE 12977 2 82 8 sphene 12520 NO ANALYTICAL DATA GIVEN PROBABLY A REDUCED AGE 12977 3 84 8 epidote 12520 NO ANALYTICAL DATA GIVEN PROBABLY A REDUCED AGE 12978 1 91 9 apatite MG-3 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 87 M.Y., HORNBLENDE 98 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12979 1 77 8 apatite R-123 NO ANALYTICAL DATA GIVEN A REDUCED AGE 12980 1 82 8 apatite MT-2 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 87 M.Y., HORNBLENDE 84 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12980 2 85 9 sphene MT-2 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 87 M.Y., HORNBLENDE 84 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12981 1 81 8 apatite BP-1 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 78 M.Y., HORNBLENDE 150 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12981 2 94 9 sphene BP-1 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 78 M.Y., HORNBLENDE 150 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12982 1 87 9 apatite BP-6 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 91 M.Y., HORNBLENDE 170 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12982 2 85 9 sphene BP-6 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 91 M.Y., HORNBLENDE 170 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12983 1 62 6 apatite R-43B NO ANALYTICAL DATA GIVEN A REDUCED AGE 12984 1 93 9 apatite R-42 age of intrusion NO ANALYTICAL DATA GIVEN 12985 1 76 8 apatite BP-9 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 81 M.Y., K-AR AGE REPORTED BY KISTLER AND OTHERS, 1965" 12985 2 94 9 sphene BP-9 age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 81 M.Y., K-AR AGE REPORTED BY KISTLER AND OTHERS, 1965" 12986 1 76 8 apatite MT-1 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 81 M.Y., K-AR AGE REPORTED BY KISTLER AND OTHERS, 1965" 12987 1 54 5 apatite R-84A NO ANALYTICAL DATA GIVEN A REDUCED AGE 12987 2 100 10 sphene R-84A age of intrusion NO ANALYTICAL DATA GIVEN 12988 1 90 9 apatite BP-5 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 88 M.Y., K-AR AGE REPORTED BY KISTLER AND OTHERS, 1965" 12988 2 92 9 sphene BP-5 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 88 M.Y., K-AR AGE REPORTED BY KISTLER AND OTHERS, 1965" 12989 1 88 9 apatite R-83 age not evaluated NO ANALYTICAL DATA GIVEN 12989 2 104 10 sphene R-83 age of intrusion NO ANALYTICAL DATA GIVEN 12990 1 58 6 apatite BP-2 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 104 M.Y., HORNBLENDE 151 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12990 2 92 9 sphene BP-2 NO ANALYTICAL DATA GIVEN "A REDUCED AGE. BIOTITE 104 M.Y., HORNBLENDE 151 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1965" 12991 1 93 9 apatite FD-2 minimum age of intrusion NO ANALYTICAL DATA GIVEN 12992 1 111 11 apatite FD-3 minimum age of intrusion NO ANALYTICAL DATA GIVEN 12992 2 118 12 sphene FD-3 age of intrusion NO ANALYTICAL DATA GIVEN 12993 1 65 7 apatite Y-5 NO ANALYTICAL DATA GIVEN A REDUCED AGE 12993 2 99 10 sphene Y-5 age of intrusion NO ANALYTICAL DATA GIVEN 12994 1 94 9 sphene Y-5A minimum age of intrusion NO ANALYTICAL DATA GIVEN 12994 2 140 14 epidote Y-5A age not evaluated NO ANALYTICAL DATA GIVEN 12995 1 85 apatite FD-13 minimum age of intrusion NO ANALYTICAL DATA GIVEN "BIOTITE 90 M.Y., HORNBLENDE 90 M.Y., ORTHOCLASE 88 M.Y., PLAGIOCLASE 81 M.Y., AUGITE 78 M.Y., K-AR AGES REPORTED BY KISTLER AND OTHERS, 1966" 12996 1 87 9 allanite RED DEVIL minimum age of intrusion NO ANALYTICAL DATA GIVEN 13193 1 22.1 4.4 apatite M406 0.223 464 0.65 1355 1.08 17 age of intrusion 13194 1 18.1 0.8 zircon M408 6.58 609 12.87 596 0.594 620 age of intrusion 13194 2 23.3 4.7 apatite M408 0.187 393 0.523 1090 1.08 14 maximum age of intrusion 13195 1 19 1 zircon M689 5.66 419 18.31 678 1.03 510 age of intrusion 13196 1 16.6 0.7 zircon M496 4.96 849 17.1 1465 0.96 510 age of volcanism 13197 1 15.7 0.8 zircon M306 6.24 636 14.31 729 0.603 680 age of intrusion 13308 1 79 allanite RD-1 5.5 514 4.18 195 0.98 AVERAGE OF FOUR DATES IS 88+/-5 M.Y.; TIME OF INTRUSION 13308 2 103 allanite RD-1 5.53 517 3.2 225 0.98 AVERAGE OF FOUR DATES IS 88+/-5 M.Y.; TIME OF INTRUSION 13308 3 83 allanite RD-1 5.38 252 3.86 252 0.98 AVERAGE OF FOUR DATES IS 88+/-5 M.Y.; TIME OF INTRUSION 13308 4 88 allanite RD-1 5.2 243 3.5 243 0.98 AVERAGE OF FOUR DATES IS 88+/-5 M.Y.; TIME OF INTRUSION 13309 1 118 epidote Y-5 6.36 297 4.24 198 1.29 AVERAGE OF 3 DATES IS 140+/-11 M.Y.; TIME OF INTRUSION 13309 2 145 epidote Y-5 7.6 284 4.08 191 1.29 AVERAGE OF 3 DATES IS 140+/-11 M.Y.; TIME OF INTRUSION 13309 3 156 epidote Y-5 7.38 276 3.68 172 1.29 AVERAGE OF 3 DATES IS 140+/-11 M.Y.; TIME OF INTRUSION 13310 1 92 allanite MG-1 3.5 327 2.28 106 0.98 AVERAGE OF 2 DATES IS 88+/-4 M.Y.; TIME OF INTRUSION 13310 2 83 allanite MG-1 2.57 360 1.84 150 0.98 AVERAGE OF 2 DATES IS 88+/-4 M.Y.; TIME OF INTRUSION 13310 3 84 10 epidote MG-1 1.33 192 1.4 124 1.45 age of intrusion 13311 1 84 10 epidote 12520 3.62 152 3.16 148 1.2 age of intrusion 13312 1 71 allanite 0-36 2.58 71 2.18 30 0.98 AVERAGE FOR 3 DATES IS 59+/-6 M.Y.; APPROXIMATE TIME OF FORMATION 13312 2 50 allanite 0-36 130 71 0.98 TRACK DENSITIES NOT GIVEN AVERAGE FOR 3 DATES IS 59+/-6 M.Y.; APPROXIMATE TIME OF FORMATION 13312 3 56 allanite 0-36 6.93 127 7.42 68 0.98 AVERAGE OF 3 DATES IS 59+/-6 M.Y.; APPROXIMATE TIME OF FORMATION 13313 1 60 allanite 0-38 1.13 301 1.136 177 0.98 AVERAGE OF SIX DATES IS 59+/-2 M.Y.; APPROXIMATE TIME OF FORMATION 13313 2 53 allanite 0-38 1.91 131 2.16 74 0.98 AVERAGE OF SIX DATES IS 59+/-2 M.Y.; APPROXIMATE TIME OF FORMATION 13313 3 64 allanite 0-38 1.25 132 1.214 75 0.98 AVERAGE OF SIX DATES IS 59+/-2 M.Y.; APPROXIMATE TIME OF FORMATION 13313 4 52 allanite 0-38 1.65 68 1.892 39 0.98 AVERAGE OF SIX DATES IS 59+/-2 M.Y.; APPROXIMATE TIME OF FORMATION 13313 5 62 allanite 0-38 1.75 48 1.698 35 0.98 AVERAGE OF SIX DATES IS 59+/-2 M.Y.; APPROXIMATE TIME OF FORMATION 13314 1 61 allanite 0-38 8.19 300 0.808 148 0.98 AVERAGE OF SIX DATES IS 59+/-2 M.Y.; APPROXIMATE TIME OF FORMATION 13315 1 71 epidote 0-131 1.76 242 1.934 155 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13315 2 67 epidote 0-131 1.13 323 1.304 211 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13315 3 59 epidote 0-131 1.06 213 1.386 138 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13315 4 54 epidote 0-131 0.952 169 1.384 115 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13315 5 52 epidote 0-131 1.15 451 1.742 390 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13316 1 63 epidote 0-131 0.667 191 0.826 125 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13316 2 61 epidote 0-131 1.75 84 2.24 54 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13316 3 77 epidote 0-131 1.15 139 1.154 70 1.28 AVERAGE OF 8 DATES IS 63+/-3 M.Y.; TIME OF FORMATION 13317 1 47 allanite JE29A-67 1 427 1.678 422 1.28 AVERAGE OF 6 DATES IS 42+/-1 M.Y.; MINIMUM TIME OF FORMATION 13317 2 39 allanite JE29A-67 1.16 423 2.32 571 1.28 AVERAGE OF 6 DATES IS 42+/-1 M.Y.; MINIMUM TIME OF FORMATION 13317 3 41 allanite JE29A-67 0.987 470 1.86 486 1.28 AVERAGE OF 6 DATES IS 42+/-1 M.Y.; MINIMUM TIME OF FORMATION 13317 4 42 allanite JE29A-67 1.34 450 2.5 660 1.28 AVERAGE OF 6 DATES IS 42+/-1 M.Y.; MINIMUM TIME OF FORMATION 13317 5 43 allanite JE29A-67 0.819 240 1.502 310 1.28 AVERAGE OF 6 DATES IS 42+/-1 M.Y.; MINIMUM TIME OF FORMATION 13318 1 41 allanite JE29A-67 0.895 308 1.704 320 1.28 AVERAGE OF 6 DATES IS 42+/-1 M.Y.; MINIMUM TIME OF FORMATION 13319 1 94 7 allanite JE22-67 32.7 486 28.6 213 1.35 maximum age of intrusion 13320 1 84 allanite RWT18-68 3.42 141 3.78 78 1.53 AVERAGE OF 2 DATES IS 91+/-7 M.Y.; TIME OF INTRUSION 13320 2 98 allanite RWT18-68 3.34 153 3.18 73 1.53 AVERAGE OF 2 DATES IS 91+/-7 M.Y.; TIME OF INTRUSION 13320 3 83 20 epidote RWT 18-68 1.16 48 1.31 27 1.53 minimum age of intrusion 13321 1 1080 110 epidote C-226 2.96 967 0.672 130 4.34 A REDUCED AGE 13322 1 0.13 0.05 glass 1(TABLE 1) 0.0002 7 0.0585 279 0.53 minimum age of volcanism 13323 1 0.14 0.05 glass 2(TABLE 1) 0.0003 9 0.283 593 2.47 AGE IS TOO YOUNG 13324 1 0.2 0.06 glass 3(TABLE 1) 0.0009 13 0.143 372 0.53 "SPURIOUS AGE, MUCH TOO YOUNG" 13325 1 0.27 0.05 glass 4(TABLE 1) 0.0008 27 0.498 569 2.72 minimum age of volcanism 13326 1 0.02 glass 5(TABLE 1) 0 1 0.125 309 0.922 "NOT ENOUGH FOSSIL FISSION-TRACKS TO CALCULATE AN AGE, CORRECTED FISSION-TRACK AGE MAY BE 0.59+/-0.12 M.Y." SAMPLE HAS BEEN NATURALLY ANNEALED 13327 1 0.58 0.3 glass 6(TABLE 1) 0.0008 3 0.044 213 0.53 minimum age of volcanism 13328 1 0.9 0.17 glass 7(TABLE 1) 0.002 29 0.125 521 0.922 minimum age of volcanism 13329 1 3.1 0.31 glass 8(TABLE 1) 0.0041 110 0.102 784 1.3 "AGE IS TOO YOUNG, SEE K-AR AGE" 13329 2 3.2 0.3 glass 8(TABLE 1) 0.0038 129 0.0835 643 1.17 "AGE IS TOO YOUNG, SEE K-AR AGE" 13329 3 5.1 0.31 glass 4(TABLE 6) 0.0029 124 0.0633 301 1.78 minimum age of volcanism A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED ONE HOUR AT 220C 13330 1 2.4 0.36 glass 9(TABLE 1) 0.0062 47 0.202 300 1.3 AGE IS TOO YOUNG; K-AR AGE IS 3.91+/-0.27 M.Y. 13331 1 4.3 0.5 glass 10(TABLE 1) 0.0099 84 0.236 489 1.71 AGE IS TOO YOUNG; SEE K-AR AGE 13332 1 2.5 0.6 glass 12(TABLE 1) 0.0021 20 0.122 471 2.47 AGE IS TOO YOUNG; K-AR AGE IS 4.42+/-0.34 M.Y. 13332 2 3.2 0.4 glass 12(TABLE 1) 0.003 84 0.151 732 2.72 AGE IS TOO YOUNG; K-AR AGE IS 4.42+/-0.34 M.Y. 13333 1 4.7 0.7 glass 13(TABLE 1) 0.0059 54 0.0991 152 1.3 AGE IS TOO YOUNG; SEE K-AR AGE 13334 1 4.4 0.3 glass 14(TABLE 1) 0.0046 196 0.17 834 2.72 GLASS WAS FROM THE SUBSURFACE--NOT EXPOSED TO THE SUN AGE IS TOO YOUNG; K-AR AGE IS 5.04+/-0.73 M.Y. 13334 2 1.5 0.2 glass 3(TABLE 6) 0.0014 137 0.14 386 2.47 GLASS FROM THE GROUND SURFACE-EXPOSED TO SUNLIGHT AGE IS SPURIOUS; GLASS HAS BEEN NATURALLY ANNEALED 13334 3 4.9 0.5 glass 3(TABLE 6) 0.0022 187 0.0668 252 2.47 minimum age of volcanism A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 225C FOR ONE HOUR 13335 1 4.7 0.4 glass 16(TABLE 1) 0.0045 214 0.141 416 2.47 AGE IS TOO YOUNG; K-AR AGE IS 5.85+/-0.67 M.Y. GLASS HAS BEEN NATURALLY ANNEALED 13335 2 4.2 0.5 glass 16(TABLE 1) 0.0044 84 0.171 667 2.72 AGE IS TOO YOUNG; K-AR AGE IS 5.85+/-0.67 M.Y. GLASS HAS BEEN NATURALLY ANNEALED 13336 1 5.9 0.6 glass 17(TABLE 1) 0.0059 113 0.102 433 1.71 AGE IS TOO YOUNG; SEE K-AR AGE 13336 2 7.1 1.5 glass 17(TABLE 1) 0.0064 91 0.0285 52 0.53 AGE IS TOO YOUNG; SEE K-AR AGE 13337 1 4.8 0.5 glass 18(TABLE 1) 0.0071 101 0.242 520 2.72 AGE IS TOO YOUNG; K-AR AGE IS 7.10+/-0.14 M.Y. GLASS HAS BEEN NATURALLY ANNEALED 13338 1 4.2 0.3 glass 19(TABLE 1) 0.0052 273 0.184 1084 2.47 AGE IS TOO YOUNG; K-AR AGE IS 7.33+/-0.34 M.Y. GLASS HAS BEEN NATURALLY ANNEALED 13338 2 7.2 0.7 glass 5(TABLE 6) 0.0044 145 0.0889 443 2.47 minimum age of volcanism FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 225C FOR ONE HOUR 13339 1 2.2 0.6 glass 20(TABLE 1) 0.0025 14 0.167 643 2.47 AGE IS TOO YOUNG; K-AR AGE IS 7.91+/-0.09 M.Y. GLASS HAS BEEN NATURALLY ANNEALED 13340 1 19.4 1.2 glass 22(TABLE 1) 0.0639 415 0.491 601 2.53 minimum age of volcanism 13340 2 23.3 1.4 glass 22(TABLE 1) 0.0628 705 0.209 490 1.3 minimum age of volcanism 13340 3 21.3 1.8 glass 22(TABLE 1) 0.0623 296 0.299 306 1.71 minimum age of volcanism 13341 1 13.4 1 glass 23(TABLE 1) 0.0673 320 0.39 395 1.3 AGE IS TOO YOUNG; SEE K-AR AGE. GLASS HAS BEEN NATURALLY ANNEALED 13341 2 11.9 0.7 glass 23(TABLE 1) 0.0502 401 0.679 787 2.69 AGE IS TOO YOUNG; SEE K-AR AGE. GLASS HAS BEEN NATURALLY ANNEALED 13341 3 13.8 0.8 glass 23(TABLE 1) 0.0547 691 0.308 512 1.3 AGE IS TOO YOUNG; SEE K-AR AGE. GLASS HAS BEEN NATURALLY ANNEALED 13341 4 20.3 2.4 glass 11(TABLE 6) 0.0555 116 0.342 258 2.09 A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 200C FOR ONE HOUR AGE IS TOO YOUNG; SEE K-AR AGE 13341 5 22.8 1.3 glass 11(TABLE 6) 61.4 776 337 560 2.09 minimum age of volcanism A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 200C FOR ONE HOUR 13342 1 19.8 1.9 glass 11(TABLE 6) 0.0383 182 0.242 302 2.09 A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 250C FOR ONE HOUR AGE IS TOO YOUNG; SEE K-AR AGE 13342 2 21.6 1.5 glass 11(TABLE 6) 0.0371 469 0.215 354 2.09 A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 250C FOR ONE HOUR AGE IS TOO YOUNG; SEE K-AR AGE 13342 3 22.7 2.5 glass 11(TABLE 6) 0.0282 134 0.155 238 2.09 minimum age of volcanism A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 300C FOR ONE HOUR 13342 4 21.7 2.1 glass 11(TABLE 6) 0.0212 268 0.122 201 2.09 A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 300C FOR ONE HOUR AGE IS TOO YOUNG; SEE K-AR AGE 13343 1 26.4 2.3 glass 24(TABLE 1) 0.114 164 0.335 649 1.3 AGE IS TOO YOUNG; K-AR AGE IS 30.0+/-1.5 M.Y. 13343 2 27.1 2.5 glass 24(TABLE 1) 0.117 211 0.65 277 2.52 AGE IS TOO YOUNG; K-AR AGE IS 30.0+/-1.5 M.Y. 13344 1 1.3 0.17 glass 1(TABLE 4) 0.0029 70 0.162 297 1.16 AGE IS TOO YOUNG; FISSION-TRACK AGE FOR ZIRCON IS 1.96+/-0.6 M.Y. 13345 1 5 0.25 zircon 2(TABLE 4) 0.529 88 7.33 910 1.15 age of volcanism 13345 2 4.5 1.2 glass 2(TABLE 4) 0.0125 15 0.193 371 1.18 minimum age of volcanism 13346 1 6.8 0.2 zircon 3(TABLE 4) 1.16 313 11.1 2728 1.09 age of volcanism 13346 2 4.9 0.33 glass 3(TABLE 4) 0.0168 449 0.227 440 1.1 AGE IS TOO YOUNG; SEE ZIRCON AGE 13347 1 7.8 0.4 zircon 4(TABLE 4) 0.573 130 5.16 585 1.18 age of volcanism 13347 2 5.3 1.5 glass 4(TABLE 4) 0.018 13 1.03 380 5.03 AGE IS TOO YOUNG; SEE ZIRCON AGE 13348 1 9.4 0.9 zircon 5(TABLE 4) 1.35 153 9.47 493 1.1 age of volcanism 13348 2 6.2 0.6 glass 5(TABLE 4) 0.0149 157 0.253 347 1.78 AGE IS TOO YOUNG; SEE ZIRCON AGE 13349 1 9.8 0.4 zircon 6(TABLE 4) 0.766 227 6.1 1248 1.28 age of volcanism 13349 2 9.9 0.4 zircon 6(TABLE 4) 1.14 163 7.01 503 1.02 age of volcanism 13349 3 7.2 0.6 glass 6(TABLE 4) 0.0216 183 0.196 638 1.09 AGE IS TOO YOUNG; SEE ZIRCON AGES 13350 1 10.3 0.3 zircon 7(TABLE 4) 0.776 291 5.48 1824 1.22 age of volcanism 13350 2 6.9 0.7 glass 7(TABLE 4) 0.0249 108 0.25 541 1.16 AGE IS TOO YOUNG; SEE ZIRCON AGE 13350 3 10.9 1.1 glass 6(TABLE 6) 0.0196 117 0.361 453 3.33 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 210C AT ONE HOUR 13351 1 11.4 1.1 zircon 8(TABLE 4) 1.19 132 6.88 382 1.1 age of volcanism 13351 2 8 1.2 glass 8(TABLE 4) 0.0212 55 0.331 228 2.09 AGE IS TOO YOUNG; SEE ZIRCON AGE 13352 1 11.5 0.9 zircon 9(TABLE 4) 0.943 201 5.97 1284 1.22 age of volcanism 13352 2 8.6 0.7 glass 9(TABLE 4) 0.0222 210 0.182 699 1.18 AGE IS TOO YOUNG; SEE ZIRCON AGE 13352 3 11.4 2 glass 7(TABLE 6) 0.0119 38 0.348 323 3.33 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 210C FOR ONE HOUR 13353 1 13.5 1.1 zircon 10(TABLE 4) 0.567 55 3.08 108 1.23 age of volcanism 13353 2 13.3 0.6 zircon 10(TABLE 4) 1.44 173 6.93 417 1.07 age of volcanism 13353 3 10.5 0.8 glass 10(TABLE 4) 0.0251 411 0.169 280 1.18 AGE IS TOO YOUNG; SEE ZIRCON AGES 13353 4 9.4 0.7 glass 8(TABLE 6) 0.0251 411 0.169 280 1.18 AGE IS TOO YOUNG; SEE ZIRCON AGES 13353 5 14.5 2.1 glass 8(TABLE 6) 0.0199 53 0.274 421 3.33 age of volcanism A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 210C FOR ONE HOUR 13354 1 17.5 0.5 zircon 11(TABLE 4) 3.68 434 16.6 1804 1.32 age of volcanism 13354 2 16.5 0.6 zircon 11(TABLE 4) 1.2 288 5.77 1 1.33 age of volcanism 13354 3 9.4 0.6 glass 11(TABLE 4) 0.02 291 0.313 889 2.47 GLASS SHARDS AGE IS TOO YOUNG; SEE ZIRCON AGES 13354 4 11.4 0.9 glass 10(TABLE 6) 0.022 185 0.285 861 2.47 GLASS SHARDS AGE IS TOO YOUNG; K-AR AGE IS 15.1 M.Y. 13354 5 15.3 1 glass 10(TABLE 6) 0.0219 290 0.21 846 2.47 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 149C FOR ONE HOUR 13355 1 13.9 1.2 glass 10(TABLE 6) 0.021 177 0.223 685 2.47 minimum age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 149C FOR ONE HOUR 13355 2 17.7 1.2 glass 10(TABLE 6) 0.0205 268 0.171 1455 2.47 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 204C FOR ONE HOUR 13355 3 18.1 1.5 glass 10(TABLE 6) 0.0222 187 0.181 570 2.47 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 204C FOR ONE HOUR 13355 4 17.7 1.5 glass 10(TABLE 6) 0.0211 183 0.176 505 2.47 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 225C FOR ONE HOUR 13355 5 16.5 1.6 glass 10(TABLE 6) 0.015 126 0.134 418 2.47 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 225C FOR ONE HOUR 13356 1 16.4 3.4 glass 10(TABLE 6) 0.0154 23 0.139 266 2.47 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 250C FOR ONE HOUR 13357 1 27.6 0.6 zircon 12(TABLE 4) 4.14 605 11 1578 1.23 age of volcanism 13357 2 28.8 0.8 zircon 12(TABLE 4) 4.15 577 10.6 737 1.23 age of volcanism 13357 3 11.7 1.8 glass 12(TABLE 4) 0.0355 77 0.21 177 1.16 AGE IS TOO YOUNG; SEE ZIRCON AGES 13358 1 27.2 0.9 zircon 13(TABLE 4) 4.55 548 10.6 641 1.06 minimum age of volcanism 13358 2 11.7 1.3 glass 13(TABLE 4) 0.0413 107 0.362 436 1.71 GLASS SHARDS AGE IS TOO YOUNG; SEE ZIRCON AGE 13358 3 11.2 0.9 glass 12(TABLE 6) 0.0362 195 0.331 991 1.71 GLASS SHARDS AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13358 4 17 1.8 glass 12(TABLE 6) 0.0463 120 0.278 351 1.71 GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 153C FOR ONE HOUR AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13358 5 18.8 1.4 glass 12(TABLE 6) 0.0412 222 0.224 715 1.71 GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 153C FOR ONE HOUR AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13359 1 25.2 2.6 glass 12(TABLE 6) 0.0486 126 0.197 424 1.71 GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 179C FOR ONE HOUR AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13359 2 25.8 1.9 glass 12(TABLE 6) 0.0432 216 0.171 569 1.71 GLASS SHARDS AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13359 3 28.4 3 glass 12(TABLE 6) 0.0467 121 0.168 415 1.71 minimum age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 204C FOR ONE HOUR 13359 4 22.7 1.8 glass 12(TABLE 6) 0.0386 207 0.174 572 1.71 GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 204C FOR ONE HOUR AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13359 5 31.3 2.9 glass 12(TABLE 6) 0.054 140 0.176 597 1.71 age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 227C FOR ONE HOUR 13360 1 27.3 2.3 glass 12(TABLE 6) 0.0363 121 0.136 466 1.71 minimum age of volcanism GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 227C FOR ONE HOUR 13360 2 20.5 2.9 glass 12(TABLE 6) 0.0313 61 0.156 247 1.71 GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 250C FOR ONE HOUR AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13360 3 23.4 2.5 glass 12(TABLE 6) 0.0224 121 0.0979 329 1.71 GLASS SHARDS A FISSION-TRACK PLATEAU ANNEALING AGE--ANNEALED AT 250C FOR ONE HOUR AGE IS TOO YOUNG; K-AR AGE IS 30.2 M.Y. 13361 1 34.4 0.7 zircon 14(TABLE 4) 7.45 1439 12.62 1219 0.98 age of volcanism 13361 2 19.5 1.7 glass 14(TABLE 4) 0.0669 191 0.399 403 1.95 AGE IS TOO YOUNG; SEE ZIRCON AGE 13792 1 8 1.1 apatite 1. 72MC113G 0.122 254 1.09 2270 1.19 age of uplift and cooling 50 GRAINS 13793 1 9.6 1 apatite 2. 72MC-116 0.194 405 1.44 2408 1.19 age of uplift and cooling "50 GRAINS COUNTED FOR FOSSIL TRACKS, 40 GRAINS COUNTED FOR INDUCTED TRACKS" 13794 1 4.9 1.9 apatite 3. 72MS-339 0.03 28 0.441 408 1.19 age of uplift and cooling 50 GRAINS COUNTED 13795 1 7.8 1.3 apatite 4. 73MS27A 0.164 152 1.43 1323 1.13 age of uplift and cooling 50 GRAINS COUNTED 13795 2 5.3 1 apatite 4. 73MS27B 0.131 121 1.67 1546 1.13 age of uplift and cooling 50 GRAINS COUNTED 13796 1 7.9 1.1 apatite 5. 73MS28A 0.238 220 2.04 1887 1.13 age of uplift and cooling 50 GRAINS COUNTED 13796 2 5.7 1.1 apatite 5. 73MS28B 0.136 126 1.61 1487 1.13 age of uplift and cooling 50 GRAINS COUNTED 13797 1 10.8 2.4 apatite 6. 73MS29A 0.104 96 0.646 598 1.13 age of uplift and cooling 50 GRAINS COUNTED 13797 2 7.5 1.2 apatite 6. 73MS29B 0.194 180 1.75 1617 1.13 age of uplift and cooling 50 GRAINS COUNTED 13798 1 14.4 2.1 apatite 7. 73MS30 0.248 230 1.16 1076 1.13 age of uplift and cooling 50 GRAINS COUNTED 13799 1 11.9 1.9 apatite 8. 73MS31A 0.202 187 1.15 1065 1.13 age of uplift and cooling 50 GRAINS COUNTED 13799 2 12.4 2.4 apatite 8. 73MS31B 0.132 122 0.717 664 1.13 age of uplift and cooling 50 GRAINS COUNTED 13800 1 9 1.7 apatite 9. 73MS32 0.076 141 0.571 529 1.13 age of uplift and cooling "100 GRAINS COUNTED FOR FOSSIL TRACKS, 50 GRAINS COUNTED FOR INDUCTED TRACKS" 13801 1 14.7 1.7 apatite 10. 73MS33A 0.377 349 1.72 1595 1.13 age of uplift and cooling 50 GRAINS COUNTED 13801 2 18.7 2.2 apatite 10. 73MS33B 0.397 368 1.43 1326 1.13 age of uplift and cooling 50 GRAINS COUNTED 13802 1 20 2.9 apatite 11. 73MS34 0.269 248 0.909 842 1.13 age of uplift and cooling 50 GRAINS COUNTED 13803 1 10 1.6 apatite 12. 73MS36 0.181 168 1.23 1138 1.13 age of uplift and cooling 50 GRAINS COUNTED 13804 1 31.3 6.3 apatite 13. 73MS37 0.149 138 0.347 321 1.22 age of uplift and cooling 50 GRAINS COUNTED 13805 1 56.3 6.4 apatite 14. 73MS39 0.613 568 0.733 679 1.13 age of uplift and cooling 50 GRAINS COUNTED 13806 1 74.8 17.2 apatite 15. 73MS40 0.172 159 0.154 143 1.13 age of uplift and cooling 50 GRAINS COUNTED 13807 1 69.3 6.2 apatite 16. 73MS42 1.1 1015 1.06 985 1.13 age of uplift and cooling 50 GRAINS COUNTED 13808 1 65.9 6.2 apatite 17. 73MS43B 0.953 882 0.972 900 1.13 age of uplift and cooling 50 GRAINS COUNTED 13809 1 7.5 0.7 apatite 18. 75MC7 0.252 525 2.92 6078 1.45 age of uplift and cooling 50 GRAINS COUNTED 13810 1 9.7 0.9 apatite 19. 75MC8 0.242 505 2.18 4535 1.45 age of uplift and cooling 50 GRAINS COUNTED 13811 1 15.7 1.3 apatite 20. 75MC9 0.708 656 3.92 3630 1.45 age of uplift and cooling 50 GRAINS COUNTED 13812 1 15.7 2.3 apatite 21. 75MC11 0.302 280 1.5 1387 1.45 age of uplift and cooling 50 GRAINS COUNTED 13813 1 14.7 1.5 apatite 22. 75MC12 0.231 2656 1.28 2656 1.45 age of uplift and cooling 50 GRAINS COUNTED 13814 1 17 1.3 apatite 23. 75MC13 0.293 271 1.49 1379 1.45 age of uplift and cooling 50 GRAINS COUNTED 13815 1 61.2 10.4 apatite 24. 75MC14 0.113 236 8.16 333 1.45 age of uplift and cooling 50 GRAINS COUNTED 13816 1 65.4 3.2 apatite 25. 75MC15 0.348 726 0.46 958 1.45 age of uplift and cooling 50 GRAINS COUNTED 13817 1 47.1 4 apatite 26. 75MC16 0.423 882 0.777 1619 1.45 age of uplift and cooling 50 GRAINS COUNTED 13818 1 46.1 4.4 apatite 27. 75MC18 0.728 674 1.36 1264 1.45 age of uplift and cooling 50 GRAINS COUNTED 13819 1 74.3 4.6 apatite 28. 74MC20 0.903 1881 1.05 2186 1.45 age of uplift and cooling 50 GRAINS COUNTED 13820 1 39.6 4.4 apatite 29. 75MC21 0.231 482 0.505 1052 1.45 age of uplift and cooling 50 GRAINS COUNTED 13821 1 84.5 9 apatite 30. 75M2C23 0.333 693 0.339 707 1.45 age of uplift and cooling 50 GRAINS COUNTED 13822 1 59.9 4 apatite 31. 75MC24 0.724 1508 1.04 2175 1.45 age of uplift and cooling 50 GRAINS COUNTED 13823 1 67.3 3.6 apatite 32. 75MC25 0.391 815 0.392 815 1.45 age of uplift and cooling 50 GRAINS COUNTED 13824 1 87.6 8.6 apatite 33. 75MC26 0.883 818 0.869 805 1.45 age of uplift and cooling 50 GRAINS COUNTED 13825 1 31.4 5.2 apatite 34. 75MC28 1.47 1359 1.77 1642 1.45 age of uplift and cooling 50 GRAINS COUNTED 13826 1 65.4 9.6 apatite 35. 75MC29 0.154 321 0.204 424 1.45 age of uplift and cooling 50 GRAINS COUNTED 13827 1 19.5 3.1 apatite 36. 75MC31 0.091 190 0.406 846 1.45 age of uplift and cooling 50 GRAINS COUNTED 13828 1 13.8 2 apatite 37. 75MC32 0.107 222 0.671 1397 1.45 age of uplift and cooling 50 GRAINS COUNTED 13829 1 94.4 10.5 apatite 38. B-112 0.839 777 0.586 543 1.11 age of uplift and cooling 50 GRAINS COUNTED 13830 1 7.9 1.3 apatite 39. K-12 0.084 176 0.71 1479 1.11 age of uplift and cooling 50 GRAINS COUNTED 13831 1 17.7 4.7 apatite 40. P-77 0.059 74 0.192 240 0.961 age of uplift and cooling 50 GRAINS COUNTED 13832 1 55.2 4 apatite 41. P-78 1.11 335 5.81 853 4.72 age of uplift and cooling 6 GRAINS COUNTED 13833 1 56.7 4.4 apatite 42. P-79 1.52 400 7.5 965 4.69 age of uplift and cooling 6 GRAINS COUNTED 13834 1 8.6 3.3 apatite 43. P-87 0.076 0.559 1.07 age of uplift and cooling 50 GRAINS COUNTED 13835 1 7.3 3.5 apatite 44. P-88 0.031 0.267 1.06 age of uplift and cooling 50 GRAINS COUNTED 13836 1 39.1 11.5 apatite 45. P-89 0.22 461 0.36 746 1.06 age of uplift and cooling 50 GRAINS COUNTED 13837 1 53.9 11.2 apatite 46. S-56 1.11 1032 1.32 1222 1.07 age of uplift and cooling 50 GRAINS COUNTED 13838 1 37.2 10.6 apatite 47. 0-66 0.44 407 0.78 719 1.1 age of uplift and cooling 50 GRAINS COUNTED 13839 1 54 12.5 apatite 48. S-54 0.78 721 0.93 860 1.08 age of uplift and cooling 50 GRAINS COUNTED 13840 1 49.9 15.5 apatite 49. S-53 1.39 288 1.81 1678 1.09 age of uplift and cooling 50 GRAINS COUNTED 13841 1 66 13.6 apatite 50. S-52 0.94 871 0.93 857 1.09 age of uplift and cooling 50 GRAINS COUNTED 13842 1 44.4 14.2 apatite 51. S-55 0.285 198 0.413 287 1.08 age of uplift and cooling 50 GRAINS COUNTED 13843 1 75.2 6.1 apatite 52. 72MC140A 0.605 1262 0.571 1189 1.19 age of uplift and cooling 50 GRAINS COUNTED 13844 1 66.9 14.5 apatite 53. 72MC140 0.179 166 0.19 176 1.19 age of uplift and cooling 50 GRAINS COUNTED 13845 1 6.5 0.5 zircon 1. J-2-E 1.1 230 104 1083 1.03 6 GRAINS COUNTED A COOLING AGE 13846 1 10.3 1 zircon 2. AM-2 0.881 204 0.526 609 1.03 minimum age of volcanism 6 GRAINS COUNTED 13874 1 11.1 1.7 zircon (NOT GIVEN) age of volcanism NO ANALYTICAL DATA GIVEN 13906 1 42.2 7.8 apatite DT78-27A 2.37 47 3.83 77 1.16 age of volcanism 13909 1 46.8 6 apatite DT78-37A 3.53 105 5.21 155 1.156 age of volcanism 13911 1 41.3 2.3 zircon VF78-115 6.38 781 8.66 535 0.939 THE MEAN OF 4 DATES IS 42.0+/-2.4 M.Y. 14112 1 62.2 2.8 sphene 567 9.92 600 10.1 620 2.16 age of uplift and cooling 6 GRAINS ETCHED WITH NAOH PLUTON IS 90 M.Y. OLD 14112 2 61.3 6.2 apatite 567 2.06 1068 2.16 1115 1.08 age of uplift and cooling 40 GRAINS ETCHED WITH NITRIC ACID PLUTON IS 90 M.Y. OLD 14113 1 60.4 2.6 zircon 568 7.66 706 8.15 751 2.16 age of uplift and cooling 6 GRAINS ETCHED WITH ALKALI HYDROXIDE 14114 1 62.7 3.2 zircon 569 5.14 400 5.27 410 2.16 age of uplift and cooling 6 GRAINS ETCHED WITH ALKALI HYDROXIDE 14114 2 63.7 6.8 apatite 569 0.96 1034 0.96 1030 1.07 age of uplift and cooling 83 GRAINS ETCHED WITH NITRIC ACID 14169 1 21.8 4.3 apatite VHNE-168N 0.0787 164 0.248 516 1.08 6.7 A COOLING DATE 14169 2 50.6 3.2 zircon VHNE-168N 11.3 2398 15.5 1650 1.14 410 A COOLING DATE; K-AR AGES ARE AROUND 65 M.Y. 14169 3 59.8 6.5 sphene VHNE-168N 5.68 644 6.14 697 2.12 90 A COOLING DATE; K-AR AGES ARE AROUND 65 M.Y. 14170 1 19.2 2.8 apatite VHNE-169N 0.114 238 0.5 1042 1.37 11 A COOLING DATE 14170 2 54 5.1 zircon VHNE-169N 6.39 1331 6.36 662 8.8 220 A COOLING DATE; K-AR AGES ARE AROUND 65 M.Y. 14329 1 72.4 4.4 sphene 20. USGS(D)-DODGSON CREEK 11.6 2246 18.38 1787 1.93 310 minimum age of intrusion 5 GRAINS DATED 14329 2 61.8 9.1 zircon 20. USGS(D)-DODGSON CREEK 3.11 504 3.23 262 1.08 100 5 GRAINS DATED DATE IS TOO YOUNG 14333 1 18.7 2.7 apatite GGN-S1 0.0393 297 0.462 1749 3.59 A COOLING AGE 14334 1 20.2 2.1 apatite ML-61 0.323 1220 3.5 1487 3.59 A COOLING AGE 14335 1 20.7 2.5 apatite ML-60 0.201 761 2.13 905 3.59 A COOLING AGE 14335 2 27.9 3.7 sphene ML-60 0.918 551 3.76 1129 1.87 PLUTON FORMED 25-26 M.Y. AGO 14336 1 22.8 2.8 apatite BR-21 0.204 773 1.97 835 3.59 A COOLING AGE 14336 2 28.1 3.3 zircon BR-21 5.18 797 18.1 1396 1.61 PLUTON FORMED 25-26 M.Y. AGO 14336 3 29.1 3 sphene BR-21 2.79 1308 9.54 2238 1.63 PLUTON FORMED 25-26 M.Y. AGO 14337 1 19.8 2.1 apatite BR-16 0.305 1152 3.38 1434 3.59 A COOLING AGE 14337 2 25.1 1.5 zircon BR-16 4.98 1436 19.7 2841 1.62 PLUTON FORMED 25-26 M.Y. AGO 14337 3 27.2 3.1 sphene BR-16 1.39 912 5.15 1691 1.65 PLUTON FORMED 25-26 M.Y. AGO 14339 1 18 2.4 apatite RC-25 0.113 429 1.23 2066 3.19 A COOLING AGE 14340 1 16.5 2.1 apatite ML-105 0.163 617 2.17 921 3.59 A COOLING AGE 14370 1 33.5 3.8 apatite RWT365-79 0.06 122 0.11 226 1.04 3 age of volcanism 14371 1 32.4 0.6 zircon VF78-323 2.29 1033 4.04 959 0.956 128 age of volcanism 5-GRAINS DATED 14372 1 30.4 1.2 zircon DF1007(R-6) 3.75 712 8.63 819 1.17 230 age of volcanism 6 GRAINS DATED 14373 1 30.2 1.1 zircon DF1010(R-14) 4.02 763 9.22 875 1.1 250 age of volcanism 6 GRAINS DATED 14374 1 26.7 1.5 zircon R222 4.53 863 9.52 906 0.94 320 age of volcanism 6 GRAINS DATED 14375 1 24.6 1.2 zircon R157 3.14 817 7.39 963 0.97 240 age of volcanism 5 GRAINS DATED 14376 1 25.1 1.1 zircon R158 1.9 409 4.25 458 0.94 140 age of volcanism 6 GRAINS DATED 14377 1 32.8 0.65 zircon RWT644-77 8.91 1759 1.55 1529 0.956 492 5 GRAINS DATED TUFF IS AROUND 33 M.Y. OLD 14378 1 34.4 2.3 zircon DF1405(R-42) 4.56 359 8.72 343 1.1 250 5 GRAINS DATED TUFF IS AROUND 33 M.Y. OLD 14379 1 30.4 2.8 zircon R12 11.19 1089 22.65 1102 1.09 660 6 GRAINS DATED A RESET DATE DUE TO THERMAL EFFECTS OF SNOQUALMIE BATHOLITH 14380 1 39.9 1.6 zircon DF100(R-11) 8.61 1316 14.96 1143 1.16 410 minimum age of volcanism 6 GRAINS DATED 14381 1 44 1.8 zircon DF1403(R-38) 7.64 1097 11.39 817 1.1 330 age of volcanism 6 GRAINS DATED 14382 1 44.6 3.2 zircon R129 5.33 884 7.62 632 1.07 140 age of volcanism 6 GRAINS DATED 14383 1 43.8 2.5 zircon R130 6.15 863 8.97 629 1.07 270 age of volcanism 6 GRAINS DATED 14384 1 40 1.4 zircon RWT363-79 2.87 677 3.98 470 0.939 128 minimum age of volcanism 5 GRAINS DATED 14385 1 35.9 1.5 zircon DF1006(R-15) 6.47 689 12.72 677 1.18 350 6 GRAINS DATED A RESET AGE DUE TO THERMAL EFFECT FROM THE SNOQUALMIE BATHOLITH 14386 1 35.5 1.4 zircon DF1009(R-13) 11.06 1024 20.46 947 1.1 600 6 GRAINS DATED A RESET AGE DUE TO THERMAL EFFECT FROM THE SNOQUALMIE BATHOLITH 14387 1 55.3 3 zircon DF945(R-8) 7.26 608 13.85 513 1.56 280 5 GRAINS DATED "SPURIOUS AGE, TOO OLD; MAY BE CONTAMINATED WITH OLD ZIRCONS" 14388 1 20.8 1.9 zircon DF944(R-7) 5.22 846 15.58 1262 1.04 450 age meaning uncertain (geologic factors) 6 GRAINS DATED ROCK MAY BE FROM A YOUNG DIKE 14389 1 51.8 1 zircon VF77-305 3.95 898 6.09 692 1.34 138 minimum age of volcanism 4 GRAINS DATED 14390 1 46.2 1.1 zircon RWT469A-76 3.71 851 5.8 665 1.21 145 5 GRAINS DATED THIS DATE IS TOO YOUNG; TUFF IS PROBABLY AROUND 52 M.Y. OLD 14391 1 54.1 2.1 zircon DF946-(R-19) 6.96 870 11.89 743 1.55 245 6 GRAINS DATED SILVER PASS VOLCANIC MEMBER IS AROUND 52 M.Y. OLD 14392 1 52.2 1.9 zircon DF947(R-20) 7.87 765 13.84 673 1.54 290 6 GRAINS DATED SILVER PASS VOLCANIC MEMBER IS AROUND 52 M.Y. OLD 14393 1 50.5 1.2 zircon VF77-101 7.45 715 8.42 404 0.957 267 4 GRAINS DATED SILVER PASS VOLCANIC MEMBER IS AROUND 52 M.Y. OLD 14394 1 49.1 5.2 zircon RWT512-75 4.85 1078 4.67 519 0.793 180 6 GRAINS DATED SILVER PASS VOLCANIC MEMBER IS AROUND 52 M.Y. OLD 14395 1 48.4 2.3 zircon VF76-450 5.64 198 8.5 150 1.23 209 3 GRAINS DATED SILVER PASS VOLCANIC MEMBER IS AROUND 52 M.Y. OLD 14396 1 43.6 1.1 zircon ER76-75 5.55 808 9.35 680 1.23 230 5 GRAINS DATED THIS DATE IS TOO YOUNG; SILVER PASS VOLCANIC MEMBER IS AROUND 52 M.Y. OLD 14398 1 4.2 0.7 glass (NOT GIVEN) DATE IS TOO LOW; GLASS IS PROBABLY 5.8 M.Y. OLD 14401 1 28.9 1.3 zircon (NOT GIVEN) age of volcanism NO ANALYTICAL DATA GIVEN 14413 1 50.7 Unk (NOT GIVEN) age not evaluated NO ANALYTICAL DATA GIVEN 14415 1 52.7 2.7 zircon (NOT GIVEN) age of intrusion NO ANALYTICAL DATA GIVEN 14416 1 54.6 2.2 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN A HYBRID DATE; ROCK IS CRETACEOUS IN AGE 14418 1 54.9 2.7 zircon (NOT GIVEN) age of volcanism NO ANALYTICAL DATA GIVEN 14419 1 67.3 7.1 zircon (NOT GIVEN) age of volcanism NO ANALYTICAL DATA GIVEN 14448 1 33.6 2.8 zircon 1. USGS(D)-DF-1150 5.67 1208 10.44 1112 1.01 310 age of intrusion 6 CRYSTALS DATED 14449 1 34.4 3.3 zircon 2. USGS(D) DF-1157 4.19 911 7.45 810 1 230 age of intrusion 6 CRYSTALS DATED 14450 1 28.7 2.2 zircon 3. USGS(D) DF-1159 4.85 1213 10.36 1295 1 310 age of intrusion 6 CRYSTALS DATED 14537 1 21.5 1.1 zircon U26 11.3 730 14.1 463 0.456 age of volcanism 5 GRAINS DATED 14538 1 18.1 4.6 zircon U7A 7.22 156 11 119 4.6 minimum age of volcanism ONE GRAIN DATED 14539 1 28.3 1.8 zircon U128-1 4.57 321 9.63 338 0.997 4 GRAINS DATED "SPURIOUS DATE, DETRITAL ZIRCONS PROBABLY PRESENT" 14539 2 40 7 zircon U12B-1 9.62 346 14.3 257 0.997 2 GRAINS DATED SPURIOUS DATE; DETRITAL ZIRCONS PROBABLY PRESENT 14540 1 30.6 1.2 zircon U229 5.87 919 11 861 0.961 age of volcanism 10 GRAINS DATED 14540 2 32.2 3.6 apatite U229 0.263 234 2.25 1002 4.62 maximum age of volcanism 15 GRAINS DATED 14541 1 29.4 1.3 zircon T54-A 10.5 1031 21.3 1047 1 age of volcanism 5 GRAINS DATED 14542 1 37 4.1 sphene U141 1.01 262 7.85 1017 4.81 age of volcanism 12 GRAINS DATED 14543 1 39.7 3.4 sphene U18B 1.88 488 2.7 350 0.955 12 GRAINS DATED TUFF PROBABLY FORMED ABOUT 38 M.Y. AGO 14544 1 39.4 2.8 sphene U32 1.83 436 2.62 311 0.943 11 GRAINS DATED TUFF PROBABLY FORMED ABOUT 38 M.Y. AGO 14545 1 38.4 4 sphene U34 1.7 366 12.8 1384 4.86 10 GRAINS DATED TUFF PROBABLY FORMED ABOUT 38 M.Y. AGO 14546 1 34.5 1.3 zircon U238 5.03 789 8.38 656 0.961 10 GRAINS DATED TUFF PROBABLY FORMED ABOUT 38 M.Y. AGO 14547 1 36.9 1.7 zircon U240 8.8 1005 13.7 782 0.961 8 GRAINS DATED TUFF PROBABLY FORMED ABOUT 38 M.Y. AGO 14548 1 36.4 1.6 zircon U57 6.63 966 6.08 886 1.12 8 GRAINS DATED TUFF IS PROBABLY AROUND 39 M.Y. OLD 14549 1 36.4 2.8 sphene U56 1.72 369 13.6 1466 4.84 10 GRAINS DATED TUFF PROBABLY FORMED ABOUT 38 M.Y. AGO 14550 1 36.6 1.6 zircon U298 6.48 727 10.7 598 1.01 minimum age of intrusion 6 GRAINS DATED 14551 1 41.8 2.3 zircon U10A 3 518 4 345 0.933 age of volcanism 8 GRAINS DATED 14734 1 41.5 3.4 zircon (NOT GIVEN) 1166 1168 0.499 1.37 age of volcanism 7 CRYSTALS DATED 14753 1 24.6 1.2 zircon 46 age of volcanism NO ANALYTICAL DATA GIVEN 14754 1 25.1 zircon 11 age of volcanism NO ANALYTICAL DATA GIVEN 14755 1 26.7 zircon 12 age of volcanism NO ANALYTICAL DATA GIVEN 14756 1 21.4 1.4 zircon 9 minimum age of intrusion NO ANALYTICAL DATA GIVEN 14757 1 22.8 zircon 52 minimum age of intrusion NO ANALYTICAL DATA GIVEN 15542 1 14.8 1.4 zircon 20 1.15 211 4.69 862 1.01 134 age of volcanism 8 ZIRCONS 15543 1 16.1 1.5 zircon 21 1.03 224 3.87 842 1.01 110 age of volcanism 8 ZIRCONS 15544 1 16.2 0.8 zircon 22 2.87 450 10.7 1682 1.01 305 age of volcanism 6 ZIRCONS 15545 1 15.4 0.8 zircon 23 2.73 714 10.7 2798 1.01 305 age of volcanism 10 ZIRCONS 15546 1 15.6 1 zircon 24 1.8 253 6.89 968 1 198 age of volcanism 6 ZIRCONS 15547 1 11.9 0.9 zircon 25 3.38 370 17 1856 1 490 age of volcanism 6 ZIRCONS 15548 1 11.7 1.3 zircon 26 0.938 181 4.79 924 1 138 age of volcanism 8 ZIRCONS 15549 1 11.2 1.1 zircon 27 1.04 205 5.55 1094 0.998 198 age of volcanism 8 ZIRCONS 15550 1 13 0.8 zircon 28 2.2 381 10.3 1748 0.996 298 age of volcanism 8 ZIRCONS 15551 1 11 0.9 zircon 29 1.8 321 9.7 1728 0.994 281 age of volcanism 8 ZIRCONS 15552 1 15.6 0.9 zircon 30 1.84 375 6.9 1278 0.992 203 age of volcanism 6 ZIRCONS 15553 1 20.7 1.2 zircon 31 2.69 239 7.68 894 0.99 223 age of volcanism 6 ZIRCONS 15554 1 10.6 0.9 zircon 32 0.701 140 3.9 780 0.98 114 age of volcanism 7 ZIRCONS 15555 1 11.2 1.2 zircon 33 0.821 133 4.33 702 0.986 126 age of volcanism 6 ZIRCONS 15556 1 13.2 0.9 zircon 34 2.41 391 10.8 1746 0.984 316 age of volcanism 8 ZIRCONS 15557 1 15.9 1 zircon 35 1.98 321 7.31 1184 0.982 214 age of volcanism 6 ZIRCONS 15558 1 16.3 1.9 zircon 36 2.83 595 10.2 2138 0.98 300 age of volcanism 8 ZIRCONS 15559 1 15.1 0.8 zircon 37 2.5 536 9.64 2070 0.978 284 age of volcanism 8 ZIRCONS 15560 1 15.3 2 zircon 38 0.896 121 3.41 460 0.976 101 age of volcanism 6 ZIRCONS 15561 1 15 0.8 zircon 39 3.28 633 13.75 2656 1.05 377 age of volcanism 8 ZIRCONS 15562 1 12.5 0.9 zircon 40 1.51 331 7.62 1666 1.05 209 age of volcanism 8 ZIRCONS 15563 1 10.8 0.8 zircon 41 1.55 248 9.03 1658 1.05 248 age of volcanism 6 ZIRCONS 15564 1 11.6 1.2 zircon 42 0.91 232 4.96 1260 1.05 136 age of volcanism 8 ZIRCONS 15565 1 11.1 1.3 zircon 43 1.03 215 5.85 1216 1.05 160 age of volcanism 8 ZIRCONS 15670 1 2.13 0.47 zircon 1. A-1 2 570 0.0378 0.914 age of volcanism (UNITS FOR PS AND PI VALUES NOT GIVEN--COMPILER) 15671 1 2.01 0.97 zircon 2. A8-9 4 118 0.0356 0.914 age of volcanism (UNITS FOR PS AND PI VALUES NOT GIVEN--COMPILER) 15672 1 0.75 0.2 zircon 3. ST-05 14 1057 0.0133 0.914 age of volcanism (UNITS FOR PS AND PI VALUES NOT GIVEN--COMPILER) 15869 1 19.8 1.2 zircon M330 (DF-1745) 17.51 1135 31.72 1028 0.599 "1,500.00" age of intrusion 15869 2 13.4 2.7 apatite M330 (DF-1745) 0.122 254 0.589 1227 1.08 16 THIS IS A COOLING AGE--PROBABLY A RESET AGE 15870 1 9.5 1.9 apatite M335 (DF-1747) 0.081 169 0.552 1151 1.08 15 DIKE IS PROBABLY AROUND 20 M.Y. OLD. THIS APATITE AGE IS A RESET AGE 15871 1 20.3 0.9 zircon M336 (DF-1748) 3.27 605 5.72 530 0.596 280 age of intrusion 15872 1 15.6 1.1 zircon M733 (DF-2996) 3.86 536 14.75 1024 1 420 age of intrusion 15873 1 8.4 0.6 zircon M735 (DF-2997) 1.84 315 12.84 1100 0.985 380 age of volcanism 15874 1 19.3 1 zircon M743 (DF-2998) 6.41 890 19.43 1349 0.978 570 age of intrusion SAMPLE WAS MISTAKENLY LABELED M734--COMPILER 15874 2 12.8 2.1 apatite M743 (DF-3000) 0.08 166 0.392 816 1.05 11 A RESET AGE 15875 1 16.1 0.8 zircon M744 (DF-2999) 5.41 651 19.47 1172 0.969 540 age of intrusion 15878 1 22.6 1 zircon M508 (DF-2262) 3.06 764 7.74 968 0.957 230 age of volcanism 15945 1 0.69 0.06 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15946 1 0.29 0.26 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15947 1 zircon (NOT GIVEN) AGE LESS THAN 0.45 M.Y.; NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15948 1 zircon (NOT GIVEN) AGE IS LESS THAN 0.08 M.Y.; NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15949 1 0.24 0.2 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15950 1 0.32 0.23 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15951 1 0.45 0.24 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15952 1 0.34 0.18 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15953 1 0.41 0.21 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15954 1 0.44 0.3 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15955 1 zircon (NOT GIVEN) AGE IS LESS THAN 0.48 M.Y.; NO ANALYYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15956 1 0.33 0.2 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15957 1 0.51 0.21 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15958 1 0.77 0.39 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15959 1 0.69 0.27 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 15960 1 0.68 0.29 zircon (NOT GIVEN) NO ANALYTICAL DATA GIVEN TIME OF BURNING OF COAL BED 16221 1 83.5 5.5 sphene DR-510 17.8 2230 26 1644 2.02 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16221 2 68.4 8.3 apatite DR-510 0.211 1956 0.194 1793 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16222 1 90.8 9.7 sphene DR-521 6.86 857 4.74 592 2.06 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16222 2 60.9 9.7 apatite DR-521 0.107 2233 0.115 2405 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16223 1 82.7 6.9 sphene DR-532A 11.8 1203 20.4 1037 2.34 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16223 2 59.6 6 apatite DR-532A 0.054 1123 0.06 1242 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16224 1 86.8 7.4 sphene DR-533 18.4 1415 23.8 912 1.81 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16225 1 87.9 6.1 sphene DR-974 9.39 1956 14.24 1484 2.19 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16225 2 14.6 3.2 apatite DR-974 0.0072 149 0.032 674 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16226 1 84.4 7 sphene DR-975 10.9 1287 17.48 1032 2.22 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16226 2 14.8 3.4 apatite DR-975 0.007 146 0.031 641 1.06 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16227 1 87.4 8.1 sphene F-3 7.77 1079 11.54 801 2.13 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16228 1 92.9 6.8 sphene DR-981 13 1884 15.18 1266 2.05 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16228 2 21.4 4.2 apatite DR-981 0.011 229 0.032 674 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16229 1 84.1 7.8 sphene HMB-1C 6.8 1139 9.5 792 1.92 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16230 1 81.7 6.3 sphene DR-1 16 1633 22.2 1127 1.85 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16230 2 23.1 4.7 apatite DR-1 0.115 1066 0.315 2913 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16231 1 86.9 6.5 sphene LEO-126 16.8 1715 23.6 1202 2 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16231 2 17.5 3.8 apatite LEO-126 0.053 493 0.192 1774 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16232 1 74.6 5.3 sphene DR566C 15 1677 28 1550 2.26 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16232 2 16.7 4.6 apatite DR-566C 0.046 954 0.18 3754 1.07 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16233 1 75.2 6.8 sphene DR-573A 6.52 1087 11.06 921 2.09 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16233 2 42.2 5.1 apatite DR-573A 0.042 867 0.062 1293 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16234 1 72.2 6.8 sphene DR-573B 7.24 1056 10.76 785 1.76 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16234 2 39 9.4 apatite DR-573B 0.041 863 0.067 1394 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16235 1 24.2 3.5 apatite DR-844 0.011 225 0.029 614 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16236 1 22.1 6.6 apatite DR-847A 0.0074 155 0.021 442 1.03 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16237 1 79.2 6.5 sphene DR-1127A 16.6 1384 24.6 1028 1.93 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16237 2 49.6 8.1 apatite DR-1127A 0.111 2301 0.143 2978 1.05 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16238 1 78.2 7.3 sphene DR-1354 6.08 1014 10.34 861 2.18 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16238 2 45.7 12.3 apatite DR-1354 0.136 1256 0.191 1764 1.05 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16239 1 73.8 5 sphene DR-1455 16.7 1851 28.8 1605 2.1 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16239 2 2.8 0.9 apatite DR-1455 0.0004 40 0.101 935 1.06 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16240 1 69 5.1 sphene DR-1981 13.4 2226 12.9 1073 1.09 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16240 2 12 2.4 apatite DR-1981 0.146 305 0.816 1701 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16241 1 73.5 7.2 sphene DR-1937 5.08 1451 4.78 596 0.99 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16241 2 60 12 apatite DR-1937 0.364 759 0.4 833 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16242 1 75.8 7.9 sphene DR-1748B 5.77 1202 5.16 536 1.11 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16242 2 39.5 8 apatite DR-1748B 0.363 756 0.612 1276 1.09 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16243 1 74.2 7.1 sphene 15-206-4B 8.49 1415 7.46 628 1.08 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16243 2 74 14 apatite 15-206-4B 0.702 1462 0.629 1311 1.09 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16244 1 82 16 sphene TS-1 7.94 331 6.58 137 1.12 initial age disturbed by later metamorphism ONLY ONE GRAIN SUITABLE FOR DATING RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16244 2 71 14 apatite TS-1 0.617 1285 0.572 1192 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16245 1 69 6.6 sphene P-11 8.47 1412 7.5 624 1 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16245 2 17.3 3.4 apatite P-11 0.18 376 0.684 1424 1.07 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16246 1 88.9 8.3 sphene SLO-5B 6.93 1732 2.52 629 1.06 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16246 2 70.1 14 apatite SLO-5B 0.476 991 0.451 940 1.09 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16247 1 85.6 9.5 sphene LAP-4D 5.82 1212 4.22 440 1.02 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16247 2 62.6 13 apatite LAP-4D 0.187 390 0.197 411 1.08 age of uplift and cooling RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16248 1 67.5 4.7 sphene DR-109 13.6 1696 26.2 1640 2.14 initial age disturbed by later metamorphism RB-SR DETERMINATIONS SUGGEST THAT DATED PLUTONS ARE AROUND 110 M.Y. OLD 16370 1 2.3 0.4 zircon (NOT GIVEN) 0.706 63 8.48 378 0.464 age of volcanism 10 ZIRCON GRAINS 16376 1 zircon WWH3 22.33 394 7.43 65 1.03 5 ZIRCON GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 106-530 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 181.9+/-48.9 M.Y. DETRITAL ZIRCON AGE--AGE OF SEDIMENTATION NOT DETERMINED 16377 1 apatite WWH5 0.299 94 5.73 902 6.72 age of uplift and cooling 8 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 9-67 M.Y.; A WEIGHTED AVERAGE OF THSE AGES IS 20.9+/-4.6 M.Y. 16377 2 zircon WW5 12.48 1578 6.53 413 0.889 9 ZIRCON GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 57-581 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 100.9+/-11.4 M.Y. DETRITAL ZIRCON AGE; AGE OF SEDIMENTATION NOT DETERMINED. 16378 1 apatite WWH9 0.213 91 2.31 494 6.61 age of uplift and cooling 10 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 6-81 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 36.3+/-8.4 M.Y. 16378 2 zircon WWH9 10.28 1078 6.6 346 1.01 9 ZIRCON GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 63-288 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 94.4+/-12.0 M.Y. DETRITAL ZIRCON AGE; AGE OF SEDIMENTATION NOT DETERMINED 16379 1 apatite WWH13 0.093 28 2.53 380 6.51 age of uplift and cooling 9 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 0-35 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 14.3+/-5.6 M.Y. 16379 2 zircon WWH13 11.04 1472 6.92 461 1.01 9 ZIRCON GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 46-322 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 95.8+/-10.6 M.Y. DETRITAL ZIRCON AGE; AGE OF SEDIMENTATION NOT DETERMINED. 16380 1 apatite WWH16 0.047 5 2.23 119 6.4 age of uplift and cooling 6 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 0-19 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 8.0+/-7.4 M.Y. 16381 1 apatite WWH24 0.036 8 2.05 230 3.67 age of uplift and cooling 6 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 0-17 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 3.8+/-2.8 M.Y. 16382 1 zircon WWH17 9.69 931 7.91 380 1.01 9 ZIRCON GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 44-649 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 73.6+/-9.2 M.Y. DETRITAL ZIRCON--AGE OF SEDIMENTATION NOT DETERMINED 16383 1 apatite WWH26 0.023 8 2.03 354 3.61 age of uplift and cooling 11 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 0-36 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 2.4S+/-1.8 M.Y. 16384 1 apatite WWH21 0.025 5 3.5 357 6.3 age of uplift and cooling 9 APATITE GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 0-10 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 2.6+/-2.4 M.Y. 16384 2 thorite WWH21 13.55 477 10.12 142 1.01 4 ZIRCON GRAINS INDIVIDUAL GRAINS RANGE IN AGE FROM 47-275 M.Y.; A WEIGHTED AVERAGE OF THESE AGES IS 100.7+/-19.5 M.Y. DETRITAL ZIRCON--AGE OF SEDIMENTATION NOT DETERMINED 17269 1 30.8 1.4 zircon CM-1-77 not given age of volcanism 17272 1 27.3 1.5 Unk not given age of volcanism 17278 1 26.7 1.8 Unk not given age of volcanism 17280 1 27 3 zircon MM-1A-74 not given age of volcanism "TABOR AND OTHERS, 1982, REPORTED THIS AGE AS 3.7+/-0.7 M.Y. (LAMBDA-F=7.03XE-17/YR.)" 17282 1 26.2 3.9 sphene MM-3-74 not given age of volcanism 17283 1 29.4 4.9 sphene MM-4-74 not given age of volcanism 17286 1 26 1.2 zircon RR-1-75 not given age of volcanism 17287 1 29.4 4 sphene DG-449 not given age of volcanism 17290 1 30 1.5 Unk not given age of volcanism 17292 1 29.9 4.6 sphene GR-225 not given age of volcanism 17293 1 26.6 4.6 sphene MO-11-67 not given age of volcanism 17294 1 30 4.8 Unk not given age of volcanism 17296 1 30.2 4.8 Unk not given age of volcanism 17299 1 26.6 3.7 sphene GR-194 not given age of volcanism 17306 1 18.9 0.8 zircon W-50-79 not given age of volcanism 17307 1 18.4 1 zircon W-93-79 not given age of volcanism 17856 1 40.6 2.2 apatite 39-3 MC 6.85E-09 0.357 568 0.483 769 0.739 0.92 age of uplift and cooling 17857 1 65.1 2.7 apatite 37-1 LM not given 0.749 1192 0.631 1003 1.187 0.92 age of uplift and cooling 18179 1 8.6 0.6 zircon USGS(D)TSV-167-79 1.43 231 9.95 806 0.14 1 age of volcanism 18179 2 9.6 4.3 apatite USGS(D)TSV-167-79 0.018 37 0.112 234 0.16 1.02 age of volcanism 18180 1 8.2 0.9 zircon USGS(D)TSV-7 0.819 182 6.26 695 0.13 1.05 minimum age of volcanism 18203 1 3.2 0.4 zircon USGS(D)83-3-19A 0.817 140 14.78 1266 0.055 0.963 age of volcanism 18204 1 2.95 0.42 zircon USGS(D)TSV-282 0.654 109 13.91 1159 0.047 1.05 age of volcanism 18205 1 2.1 0.4 zircon USGS(D)TSV-391 0.215 66 6.05 927 0.035 0.971 age of volcanism 18232 1 20.4 1.4 zircon UAKA 83-7 6.85E-09 1.94 2543 5.16 3379 0.38 0.908 age of volcanism 18232 2 20.6 4.2 apatite UAKA 83-7 6.85E-09 0.05 112 1.09 1161 0.05 7.1 6.1 age of volcanism 18246 1 18.5 3.6 apatite UAKA 83-166 6.85E-09 0.12 120 2.66 1376 0.05 7.1 14.9 age of volcanism 18256 1 29.8 3.2 zircon USGS(D) 77D54 6.85E-09 7.24 834 14.96 861 0.48 1.03 420 age of volcanism 18256 2 24.7 5.5 apatite USGS(D) 77D54 6.85E-09 0.087 109 0.234 293 0.372 1.11 6.1 minimum age of volcanism 18263 1 20.5 3.3 zircon USGS(D) 79D321 6.85E-09 1.44 273 4.39 417 0.33 1.05 120 age of volcanism 18265 1 27 3.2 zircon USGS(D) 79D296 6.85E-09 2.29 635 5.31 737 0.43 1.05 150 age of volcanism 18266 1 25 3.3 zircon USGS(D) 79D341 6.85E-09 3.23 463 8.1 581 0.4 1.05 220 age of volcanism 18268 1 28.5 3.5 zircon USGS(D) 79D317 6.85E-09 3.14 582 6.91 640 0.45 1.05 190 age of volcanism 18269 1 25.5 3 zircon USGS(D) 78D147 6.85E-09 2.91 635 6.89 750 0.42 1.01 200 age of volcanism 18270 1 31.3 3.2 zircon USGS(D) 78D132 6.85E-09 4.18 1967 8.11 939 0.52 1.02 230 age of volcanism 18270 2 32 8.7 apatite USGS(D) 78D132 6.85E-09 0.184 68 1.63 302 0.11 4.76 9.9 age of volcanism 18271 1 26.7 2.8 zircon USGS(D) 78D124a 6.85E-09 5.27 829 12.03 947 0.44 1.02 340 age of volcanism 18271 2 33.5 12.3 apatite USGS(D) 78D124a 6.85E-09 0.077 160 0.141 294 0.55 1.03 3.9 maximum age of volcanism 18327 1 41.7 4.3 zircon USGS(D) 77D192 6.85E-09 7.44 1110 10.79 818 0.69 1.03 310 age of volcanism 18330 1 36.5 3.6 zircon USGS(D) 77T60 6.85E-09 8.4 1103 14.17 930 0.59 1.03 400 age of volcanism 18332 1 Unk 6.85E-09 18354 1 Unk 6.85E-09 18468 1 29 0.5 zircon AP244 6.85E-09 age of volcanism Average of 6 determinations 18469 1 24.5 0.4 zircon AP236 6.85E-09 age of volcanism Average of 5 determinations 18469 2 25.4 0.6 sphene AP236 6.85E-09 age of volcanism Average of 12 determinations 18470 1 24.2 0.5 zircon AP232 6.85E-09 age of volcanism Average of 6 determinations 18470 2 23.4 0.9 sphene AP232 6.85E-09 age of volcanism Average of 13 determinations 18471 1 16 0.8 zircon AP27A 6.85E-09 age of volcanism Average of 6 determinations 18472 1 16.1 0.8 zircon AP200 6.85E-09 age of volcanism Average of 6 determinations 18472 2 16.1 1.1 sphene AP200 6.85E-09 age of volcanism Average of 14 determinations 18473 1 14.9 0.8 zircon AP234 6.85E-09 age of volcanism Average of 5 determinations 18473 2 15.4 0.8 sphene AP234 6.85E-09 age of volcanism Average of 9 determinations 18565 1 2.98 0.28 zircon 48 1.52E-05 0.71 217 14 2088 0.0507 0.959 age of volcanism 18565 2 2.91 0.2 zircon 48 1.52E-05 0.53 390 11 3754 0.0482 0.959 age of volcanism 18667 1 14.4 0.8 zircon 2 7.03E-09 2.26 367 9.69 785 0.2332 1.03 270 age of volcanism 18668 1 13.9 2 zircon 3 6.85E-09 0.72 47 3.2 326 0.225 1.03 90 age of volcanism