'ûSAMPLECNSACLASSNQUADCLATITUDEN LONGITUDEN ROCKC METHODCMINCAGENERRORNREFCMCOMMENTCÁLATDEGNLATMINN LATDIRCLONDEGNLONMINN LONDIRCOLDLATITUDN OLDLONGITUN DESCRIPTIOC$SINGLE_GRACX206PB_238NX207PB_235NX207PB_206NX208PB_232NX206PB_204NUPPER_INTENLOWER_INTENUERRORNLERRORN 85SK 175B 9045Baird Mountains67.0349000000000161.167800000000Granite Zircon705 Karl and Aleinikoff, 1990 Killarichuk Hills, western Brooks range 67 2.0940000000N16110.06800000W67.000000000000161.00000000000(-100+150) diamagnetic zircon No537.0564.0678.00 .0 705 63.0 .0 85SK 175B 9045Baird Mountains67.0349000000000161.167800000000Granite Zircon705 Karl and Aleinikoff, 1990 Killarichuk Hills, western Brooks range 67 2.0940000000N16110.06800000W67.000000000000161.00000000000(-100+150) magnetic zircon No547.0577.0694.00 .0 705 63.0 .0 85SK 175B 9045Baird Mountains67.0349000000000161.167800000000Granite Zircon705 Karl and Aleinikoff, 1990 Killarichuk Hills, western Brooks range 67 2.0940000000N16110.06800000W67.000000000000161.00000000000(100+150) diamagnetic abraded zirconNo630.0647.0708.00 .0 705 63.0 .0 85SK 175B 9045Baird Mountains67.0349000000000161.167800000000Granite Zircon705 Karl and Aleinikoff, 1990 Killarichuk Hills, western Brooks range 67 2.0940000000N16110.06800000W67.000000000000161.00000000000(-250) nonmagnetic zircon No496.0532.0688.00 .0 705 63.0 .0 77Dn76 Ambler River 67.1733333333333156.376666666667Schist Zircon Dillon et al, 1979, 1980, Hitzman et al, 1982, 1986, Mayfield et al, 1983 Duplicate sample 77Mw76, Arctic prospect 67 10.4000000000N15622.60000000W67.173333333333156.37666666667magnetic separate no329.0334.0373.00 .0 .0 .0 77Mw76 Ambler River 67.1733333333333156.376666666667Schist Zircon Dillon et al, 1979, 1980, Hitzman et al, 1982, 1986, Mayfield et al, 1983 Duplicate sample 77Dn76, Arctic prospect 67 10.4000000000N15622.60000000W67.173333333333156.37666666667diamagnetic separate no327.0332.0364.00 .0 .0 .0 77Dn72a 7260Wiseman 67.1883333333333152.580000000000Schist Zircon Dillon et al, 1979, 1980 Possibly a metatuff 67 11.3000000000N15234.80000000W67.188333333333152.58000000000 no277.0285.0353.00 .0 .0 .0 77Dn72b 7260Wiseman 67.1883333333333152.580000000000Schist Zircon Dillon et al, 1979, 1980 Possibly a metatuff 67 11.3000000000N15234.80000000W67.188333333333152.58000000000 no276.0285.0367.00 .0 .0 .0 77Dn72c 7260Wiseman 67.1883333333333152.580000000000Schist Zircon Dillon et al, 1980 Possibly a metatuff 67 11.3000000000N15234.80000000W67.188333333333152.58000000000 no268.0279.0378.00 .0 .0 .0 77Dn102a 9060Wiseman 67.3500000000000152.296666666667Gneiss Zircon Dillon et al, 1979, 1980 Sixtymile River, granite orthogneiss 67 21.0000000000N15217.80000000W67.350000000000152.29666666667 no652.0688.0807.00 .0 .0 .0 77Dn102b 9060Wiseman 67.3500000000000152.296666666667Gneiss Zircon Dillon et al, 1979, 1980 Sixtymile River, granite orthogneiss 67 21.0000000000N15217.80000000W67.350000000000152.29666666667 no656.0693.0816.00 .0 .0 .0 77Dn102c 9060Wiseman 67.3500000000000152.296666666667Gneiss Zircon Dillon et al, 1980 Sixtymile River, granite orthogneiss 67 21.0000000000N15217.80000000W67.350000000000152.29666666667 no679.0731.0895.00 .0 .0 .0 77Dn217c 9060Wiseman 67.3916666666667152.786666666667Gneiss Zircon Dillon et al, 1980 Granite orthogneiss, Ernie Lake 67 23.5000000000N15247.20000000W67.391666666667152.78666666667 no801.0855.0999.00 .0 .0 .0 77Dn217a 9060Wiseman 67.3983333333333152.955000000000Gneiss Zircon Dillon et al, 1979, 1980 Ernie Lake, granite orthogneiss 67 23.9000000000N15257.30000000W67.398333333333152.95500000000 no799.0829.0911.00 .0 .0 .0 77Dn217b 9060Wiseman 67.3983333333333152.955000000000Gneiss Zircon Dillon et al, 1979, 1980 Granite orthogneiss, Ernie Lake 67 23.9000000000N15257.30000000W67.398333333333152.95500000000 no681.0761.01002.0 .0 .0 .0 60ATr134 7250Ambler River 67.4000000000000156.333333333333Granite Zircon210 Mayfield et al, 1983 Meta-granite 67 24.0000000000N15620.00000000W67.400000000000156.33333333333 .0 .0 .00 .0 .0 .0 84APa11 7250Survey Pass 67.4000000000000154.933333333333Gneiss Zircon Arth and Stern, written communication, 1986 Mt. Igikpak, granite and granite gneiss 67 24.0000000000N15456.00000000W67.400000000000154.93333333333 no322.2326.9359.20379.1 .0 .0 84APa13 7250Survey Pass 67.4500000000000154.650000000000Gneiss Zircon Arth and Stern, written communication, 1986 Mt. Igikpak, granite and granite gneiss 67 27.0000000000N15439.00000000W67.450000000000154.65000000000 no288.5299.6387.50317.3 .0 .0 90TM 409 6973Wiseman 67.8714000000000149.731600000000Dacite Zircon393 2 Aleinikoff and others, 1993; Till and others, in press Dacite porphyry; weighted intercept of Pb/Pb ages. 67 52.2840000000N14943.89600000W .000000000000 .00000000000 .0 .0393.00 .0 .0 .0 90TM 497 6973Wiseman 67.9772333333333149.509833333333Porphyry Zircon385 2 Aleinikoff and others, 1993; Till and others, in press Plagioclase porphyry 67 58.6340000000N14930.59000000W .000000000000 .00000000000 385.0 .0 .00 .0 1015388.7103 3.2 87ATi 70A 7250Wiseman 67.1044666666667155.310050000000Orthogneiss Zircon400 4 Till and others, in press Granitic orthogneiss 67 6.2680000000N15518.60300000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 77Dn43 7250Wiseman 67.3225000000000151.334166666667Gneiss Zircon365 15 Dillon et al, 1979, 1980; Till and others, in press Wild River 67 19.3500000000N15120.05000000W67.323333333333151.34166666667 no335.0338.0357.00 .0 .0 .0 88TM 137 7250Wiseman 67.3580000000000150.163600000000Orthogneiss Zircon392 Aleinikoff and others, 1993; Till and others, in press Estimated maximum age 67 21.4800000000N150 9.81600000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 77Dn74M 7250Survey Pass 67.3750000000000154.175000000000Gneiss Zircon365 15 Dillon et al, 1979, 1980, Nelson and Grybeck, 1980; Till and others, in pressMonzonite orthogneiss 67 22.5000000000N15410.50000000W67.371666666667154.18500000000magnetic separate no356.0358.0375.00 .0 .0 .0 77Dn74D 7250Survey Pass 67.3750000000000154.175000000000Gneiss Zircon365 15 Dillon et al, 1979, 1980, Nelson and Grybeck, 1980; Till and others, in press206Pb/238U, 207Pb/235U, 207Pb/206Pb dates, diamagnetic separate 67 22.5000000000N15410.50000000W67.371666666667154.18500000000 357.0 .0 .00 .0 .0 .0 90ANK 12 7250Chandalar 67.4713333333333149.009166666667Orthogneiss Zircon381398 Aleinikoff and others, 1993; Till and others, in press Compsite of zircon and monazite dates; reported as at least 381 Ma based on monazite and no more than 398 Ma based on zircon. Data is discordant and no concordia intercept could be calculated.67 28.2800000000N149 .55000000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 93-JT-88 7250Survey Pass 67.5016666666667154.990000000000Orthogneiss Zircon385 Toro and others, 2002; Till and others, in press Range of ages, 375 to 395 reported, no error reported 67 30.1000000000N15459.40000000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 90TM 408 7250Chandalar 67.7005000000000148.705900000000Orthogneiss Zircon391 1 Aleinikoff and others, 1993; Till and others, in press Hornblende-biotite granite gneiss. Weighted average of 206Pb/238U ages 67 42.0300000000N14842.35400000W .000000000000 .00000000000 391.0 .0 .00 .0 .0 .0 n.a. 7260Wiseman 67.0867000000000155.029333333333Metarhyolite Zircon386 2 McClelland and others, 2006; Till and others, in press Sun/Picnic Creek prospect 67 5.2020000000N155 1.76000000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 n.a. 7260Ambler River 67.1346333333333156.145350000000Metarhyolite Zircon381 2 McClelland and others, 2006; Till and others, in press Tom prospect 67 8.0780000000N156 8.72100000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 n.a. 7260Ambler River 67.1875333333333156.383466666667Metarhyolite Zircon376 3 Raterman and others, 2006; Till and others, in press Arctic deposit 67 11.2520000000N15623.00800000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 n.a. 7260Ambler River 67.1875333333333156.383466666667Metarhyolite Zircon376 2 Raterman and others, 2006; Till and others, in press Arctic deposit 67 11.2520000000N15623.00800000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 n.a. 7260Ambler River 67.1875333333333156.383466666667Metarhyolite Zircon379 3 Raterman and others, 2006; Till and others, in press Arctic deposit 67 11.2520000000N15623.00800000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 n.a. 7260Ambler River 67.1875333333333156.383466666667Metarhyolite Zircon405 3 McClelland and others, 2006; Till and others, in press Arctic deposit 67 11.2520000000N15623.00800000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 90TM 498 8605Chandalar 67.6583333333333149.195000000000Orthogneiss Zircon393 2 Aleinikoff and others, 1993; Till and others, in press Hornblende-biotite granite gneiss. Weighted average; interpreted age 67 39.5000000000N14911.70000000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 85SK 175B 9045Baird Mountains67.0349000000000161.167800000000Granite Zircon705 35 Karl and Aleinikoff, 1990; Till and others, in press Killarichuk Hills, western Brooks Range. Alkali feldspar granite 67 2.0940000000N16110.06800000W67.000000000000161.00000000000(+100) diamagnetic, abraded zircon No635.0648.0692.00 .0 705 63.0 .0 W-1 9060Wiseman 479.450000000000152.811150000000Orthogneiss Zircon971 5 McClelland and others, 2006; Till and others, in press Granitic orthogneiss 67 24747.0000000N15248.66900000W .000000000000 .00000000000 .0 .0 .00 .0 .0 .0 78Md 120 (MtAngay)9300Baird Mountains67.7044000000000159.422800000000Granodiorite Zircon750 6 Karl et al, 1989, Till, 1989; Till and others, in press Intrusive age, Mt. Angayukaqsraq. 67 42.2640000000N15925.36800000W67.706666666667159.42333333333 no .0 .0 .00 .0 750 .0 .0 85Dn 24 9300Baird Mountains67.7407000000000159.500000000000Granite Zircon750 6 Karl and others, 1989; Till and others, in press Till and others (in pres) report rock type as Alkali feldspar granite 67 44.4420000000N15930.00000000W .000000000000 .00000000000Fault lense .0 .0 .00 .0 .0 .0