GEOCHRONOLOGY
MAP # FIELD # AGE (Ma) LAB1 UTM Easting (NAD83) UTM Northing (NAD83) GEOGRAPHICAL LOCATION LITHOLOGY ROCK UNIT REFERENCE
                   
1 HFBL02-2003 191 ± 12 (U/Pb) UBC 651942 5870269 W of East Sakumtha River Quartz-dacite lapilli tuff Hazelton Group R. Friedman (this study)
2 HFBM02-3020 189 ± 0.8 Ma (U/Pb) UBC 655520 5782130 Howe Lake Tonalite Howe Lake plutonic suite R. Friedman (this study)
3 GJP-27 182.4 ± 4.7 Ma (U/Pb) Univ Az 631589 5832108 1.5 km SW of Wattie Point Diorite Howe Lake plutonic suite G. Gehrels (pers. comm., 2006)
4 HFBL02-1604-1 181.9 ± 0.8 (U/Pb) UBC 667038 5796259 6 km N of Mount Saugstad Foliated biotite tonalite Howe Lake plutonic suite R. Friedman (this study)
5 HFB03-0508-1 181.6 ± 1.0 Ma (U/Pb) UBC 652740 5835620 Ridge W of Kalone Peak Quartz-rich crystal lithic tuff Hazelton Group R. Friedman (this study)
6 HFBM02-1405-1 176.5 ± 0.6 (U/Pb) UBC 664895 5872855 NE of Jumble Mountain Crystal-lithic lapilli tuff Hazelton Group R. Friedman (this study)
7 SCBD01-0605 171.6 ± 2.3 (U/Pb) UBC 677545 5828855 Lowermost N slope of Tzeetsaytsul Peak Aphanitic dacite flow dome Hazelton Group R. Friedman (this study)
8 HFBL02-1404-1 170.2 ± 1.4 (U/Pb) UBC 672070 5828107 NW of Mount Stepp Quartz-rhyolite flow Noosgulch assemblage R. Friedman (this study)
9 SCB01-4104/VN01-B05 Detrital zircon continuum: 180-138 Ma, with peak ca. 160 Ma (U/Pb) GSC-O 656057 5829560 Ridge between Swallop Creek and Necleetsconnay River, apprxoimately 7 km W of Mount Creswell Wacke with granitic detritus Monarch assemblage M. Villeneuve (this study)
10 SCBD01-2502 164.7 ± 2 (U/Pb) UBC 673912 5834551 Ridge SE of Mount Collins Rhyolite ash-flow tuff Noosgulch assemblage R. Friedman (this study)
11 GR96-124 164.2 ± 4.4 (U/Pb) UBC 675150 5828850 Nifty mineral prospect Quartz-phyric rhyolite dyke Noosgulch assemblage Ray et al. (1998)
12 SCB00-0707-1 163.7 ± 0.4 (U/Pb) GSC-O 675234 5829271 Nifty area Dacitic breccia Noosgulch assemblage M. Villeneuve (this study)
13 HFBL02-3001-3 162.4 +1.3/-0.6 (U/Pb); 72.9 ± 1.1 Ma (Ar/Ar [K-fspar]) UBC 674616 5841390 NE of Stack Peak Biotite granodiorite Firvale plutonic suite5 R. Friedman and T. Ullrich (this study)
14 V89-56-4 159.6 ± 0.5 (U/Pb) vdH 7001472 58008992 2 km NNW of Nordschow Creek Mylonitic granodiorite Firvale plutonic suite? van der Heyden (2004)
15 GJP-24 157.1 ± 3.2 Ma (U/Pb) Univ Az 638343 5839975 E side Dean Channel opposite mouth of Sutslem Creek Diorite JKp G. Gehrels (pers. comm., 2006)
16 04-M-213 149.1 ± 0.5 (U/Pb) UBC 636263 5873462 E of Dam Mountain Hornblende-biotite granodiorite Firvale plutonic suite5 R. Friedman (this study)
17 HFBL02-0601-1 149 ± 1 (U/Pb) UBC 660793 5853994 SW of Mount Bernhardt Hornblende-biotite granodiorite Firvale plutonic suite5 R. Friedman (this study)
18 HFBL02-3004-2 148.6 ± 0.6 (U/Pb) UBC 665129 5840789 S of Forward Mountain K-mega granodiorite Firvale plutonic suite5 R. Friedman (this study)
19 GJP-1 144.5 ± 2.9 Ma (U/Pb) Univ Az 674762 5814646 W side Tseapseahoolz Creek Diorite JKp G. Gehrels (pers. comm., 2006)
20 SCBM01-1405-1 141 ± 1 (Ar/Ar [hbl, biot]) UBC 650034 5836972 Head of Humpback Creek Quartz-phyric granodiorite Firvale plutonic suite? T. Ullrich (this study)
21 SCBD01-1803-2 140.0 ± 1.0 Ma (U/Pb) UBC 648705 5813457 S spur of Mount Pootlass Quartz-phyric rhyolite dyke   R. Friedman (this study)
22 SCB01-1704-1 139.9 ± 1.2 (U/Pb) GSC-O 666800 5825700 Ridge SW of Talcheazoone Lakes Chlorite altered biotite granodiorite Firvale plutonic suite M. Villeneuve in Struik et al. (2003)
23 SCB01-4106-2 134.3 ± 0.2 (U/Pb) GSC-O 669570 5818281 Ridge NW of Salloomt Peak Chlorite altered hornblende granodiorite Firvale plutonic suite M. Villeneuve in Struik et al. (2003)
V89-49-1 133.9 ± 0.2 (U/Pb) vdH 6696862 58182482 5.9 km NNW of Salloomt Peak Chlorite altered biotite-hornblende granodiorite Firvale plutonic suite van der Heyden (2004)
24 SCB01-1301-3 133.4 ± 0.2 (U/Pb) GSC-O 655951 5828563 Ridge between Swallop Creek and Necleetsconnay River Foliated quartz diorite Firvale plutonic suite M. Villeneuve in Struik et al. (2003)
25 V89-57 133.1 ± 4.3 (U/Pb) vdH 6980462 58052192 Along logging road adjacent to Talchako River Chlorite altered biotite-hornblende granodiorite Firvale plutonic suite van der Heyden (2004)
26 BBC-9 132.0 ± 0.6 (U/Pb) (minimum age) vdH 7030972 58051402 Outcrop along Highway 20, approximately 5 km E of Stuie Altered granodiorite Firvale plutonic suite (Atnarko pluton) van der Heyden (2004)
27 SCB01-2306-1 122.6 ± 1.4 (U/Pb) GSC-O 648530 5821542 Ridge N of Mount Pootlass Biotite-quartz diorite/tonalite Desire plutonic suite M. Villeneuve in Struik et al. (2003)
28 91GC1001 119.0 ± 2 (U/Pb) Univ Az 650084 5804957 Along highway W of Bella Coola Biotite quartz diorite Desire plutonic suite Gehrels and Boghossian (2000)
29 HFBWV02-0905 118.8 ± 0.4 (U/Pb) UBC 669721 5782973 5 km ESE of Desire Mountain Tonalite Desire plutonic suite R. Friedman (this study)
30 SCBD01-0402 113 Ma minimum3 (U/Pb) UBC 677417 5827245 100 m below summit of Tzeetsaytsul Peak Rhyodacite lapilli tuff Salloomt assemblage R. Friedman (this study)
31 79-JBM-05 112.8 ± 1.5 Ma (U/Pb) UBC 670428 5817241 Upper part of ridge SE from summit of prominent peak N of Salloomt Peak Welded tuff Salloomt assemblage R. Friedman (this study)
32 SCBD01-2803-1 110.6 ± 2.6 Ma (Ar/Ar [hbl]) (date considered unreliable) UBC 639153 5817702 3 km due W of Mount Saunders Hornblende andesite tuff Hazelton Group T. Ullrich (this study)
33 HFBWV02-0803-2 110.3 ± 0.5 (U/Pb) UBC 695719 5801042 Melikan Mountain Granite Melikan pluton R. Friedman (this study)
34 SCBD01-0406 104.6 ± 2.5 Ma4 (Ar/Ar [hbl]) UBC 676590 5826853 W-facing slope of Tzeetsaytsul Peak, elev 1995 m Augite-hornblende phyric andesite Salloomt assmblage (massive basaltic unit) T. Ullrich (this study)
35 GJP-13 98.4 ± 1.8 Ma (U/Pb) Univ Az 624394 5796555 Burke Channel 0.75 km S of Kwaspala Point Tonalite   G. Gehrels (pers. comm., 2006)
36 HFBL02-1704-1 95.10 ± 0.76 Ma (Ar/Ar [biot]) UBC 666523 5798035 Ridge between Snootli and Nooklikonnik creeks Biotite tonalite Big Snow plutonic suite T. Ullrich (this study)
37 91MR-85 91 ± 3 (U/Pb) Univ Az 672578 5760064 NW of Mount Daunt (original published but incorrect loc data: 54°N 126°29'27"W) Orthogneiss Mount Daunt pluton Rusmore et al. (2000)
38 HFB02-0101-2 86.9 ± 0.9 (U/Pb) UBC 660578 5798231 Ridge between Thorsen and Snooka creeks Biotite granodiorite Big Snow plutonic suite R. Friedman (this study)
39 GJP-23 82.8 ± 2.8 Ma (U/Pb) Univ Az 618865 5823435 W side of Dean Channel, 2.5 km SW of mouth of Carlson Inlet 2-mica granite JKp G. Gehrels (pers. comm., 2006)
40 SCB00-0505-1 79 +4/-6 (U/Pb) GSC-O 680991 5788439 Approximately 2.5 km WSW of Odegard Falls Granodiorite to quartz diorite Big Snow plutonic suite? M. Villeneuve (this study)
41 SCB01-1401-1 77.7 ± 1.8 Ma (Ar/Ar [hbl]) (reset) UBC 661992 5824615 Near Hourglass Lake Basalt flows Monarch assemblage T. Ullrich (this study)
42 GJP-9 77.3 ± 1.7 Ma (U/Pb) Univ Az 641406 5801662 S side of North Bentinck Arm at Flagpole Point Diorite Fougner plutonic suite G. Gehrels (pers. comm., 2006)
43 SCBM01-1802-1 76.34 ± 0.52 Ma (Ar/Ar [biot]); 97.3 ± 1.2 Ma (Ar/Ar [hbl, hi-T]) (both dates reset) UBC 652744 5817961 Ridge N of Christenson Creek Hornblende-biotite tonalite Desire plutonic suite T. Ullrich (this study)
44 HFBM02-2507-1 75.3 ± 0.5 (U/Pb) UBC 655462 5813720 Necleetsconnay River   Fougner plutonic suite R. Friedman (this study)
45 SCB01-1209-1 72.9 ± 0.5 (U/Pb) GSC-O 656750 5827850 Ridge between Necleetsconnay River and Swallop Creek Garnet-muscovite-biotite granite Four Mile plutonic suite M. Villeneuve in Struik et al. (2003)
46 SCB00-0710-1 72.1 +0.2/-1.0 (U/Pb) GSC-O 661090 5809963 E of Four Mile Mountain Garnet-muscovite granite Four Mile plutonic suite M. Villeneuve (this study)
47 01JBM03 72.0 ± 0.3 (U/Pb) UBC 666082 5806097 Bella Coola River valley bottom, S side Garnet 2-mica granite Four Mile plutonic suite R. Friedman (this study)
48 HFBM02-0301-3 70.18 ± 0.60 Ma (Ar/Ar [biot]); 74.0 ± 4.3 Ma (Ar/Ar [hbl]) UBC 701781 5771783 Toe of Jacobsen Glacier Biotite tonalite KPd T. Ullrich (this study)
49 HS-40-06-64 70 ± 14 (K/Ar [biot]) GSC-O 684864 5777235 Elev. 6000', N side of War Drum Glacier (52°07'N 126°18'W) Unfoliated biotite-hornblende granodiorite Big Snow plutonic suite? A.J. Baer in Wanless et al. (1967) (Date GSC 65-28)
50 HFBL02-2201-1 68.2 ± 1.0 (U/Pb) UBC 649820 5795231 Summit of Mount Fougner Biotite tonalite Fougner plutonic suite R. Friedman (this study)
51 HFBG02-1003-1 67.2 ± 0.3 (Ar/Ar [biot]) UBC 649619 5816775 Ridge near headwaters of Christenson Creek Muscovite-biotite granite, trace muscovite Four Mile plutonic suite T. Ullrich (this study)
52 91MR-07 62.2 ± 1.0 (U/Pb) Univ Az 6347762 57969472 Burke Channel, Menzies Point Mylonitized 2-mica granite Pg Rusmore et al. (2001)
53 GJP-22 61.5 ± 1.7 Ma (U/Pb) Univ Az 620522 5822251 E side of Dean Channel, 1 km NE of White Cliff Point Diorite Pg G. Gehrels (pers. comm., 2006)
54 91GC1041 61.4 ± 0.6 (U/Pb) Univ Az 6270862 57973772 S shore Burke Channel east of Kwaspala Point Protomylonitic tonalite Pg Rusmore et al. (2001)
55 GJP-12 58.4 ± 1.9 Ma (U/Pb) Univ Az 625219 5797663 Burke Channel, S side of Jacobsen Bay Tonalite Pg G. Gehrels (pers. comm., 2006)
56 BT-89-A-63 57 ± 6 (K/Ar [biot]) GSC-O 620153 5808633 Ovesen Point, Labouchere Channel (52°25'N 127°14'W) Granite to granodiorite   A.J. Baer in Wanless et al. (1966) (Date GSC 64-10)
BT-89-A-63 51 ± 6 (K/Ar [musc]) GSC-O 620153 5808633 Ovesen Point, Labouchere Channel (52°25'N 127°14'W) Granite to granodiorite   A.J. Baer in Wanless et al. (1968) (Date GSC 66-20)
57 92MR37 56 ± 2 (U/Pb) Univ Az 6668932 57534092 S of Noieck River Unfoliated tonalite Sheemahant pluton Rusmore et al. (2001)
58 HFBW02-1203-1 53.0 ± 0.2 (Ar/Ar [biot]) UBC 651023 5847960 S of Nooskulla Peak Biotite tonalite Nooskulla pluton T. Ullrich (this study)
59 HFBL02-0903 53 ± 0.1 (U/Pb) UBC 662410 5862290 N side of Sea Lion Peak Biotite-quartz rhyolite flow dome Ootsa Lake Group R. Friedman (this study)
60 GJP-16 52.7 ± 1.5 Ma (U/Pb) Univ Az 621346 5805356 Labouchere Channel, Deas Point 2-mica granite Mesachie pluton G. Gehrels (pers. comm., 2006)
61 HFBL02-1201-1 52.52 ± 0.49 Ma (Ar/Ar [biot]) UBC 657696 5867589 S flank Sakumtha Crag Quartz biotite granitoid dyke   T. Ullrich (this study)
62 HFBW02-0201-2 51.9 ± 0.2 (Ar/Ar [musc]); 52.7 ± 0.4 (Ar/Ar [biot]) UBC 630796 5803474 Approximately 4 km NNE of Lalakata Point Muscovite-biotite granite Mesachie pluton T. Ullrich (this study)
63 91GC1053 51 ± 4 (U/Pb) Univ Az 6202452 58089662 Labouchere Channel, SE of Edward Point 2-mica granite dyke   Rusmore et al. (2001)
64 BT-31-03-64 47 ± 5 (K/Ar [biot]) GSC-O 652900 5854500 Elev. 5500', NE of Nooskulla Peak; location given in reference (52°49'N 126°38'W) is incorrect Leucocratic granodiorite Nooskulla pluton A.J. Baer in Wanless et al. (1967) (Date GSC 65-19)
 
1  GSC-O = Geological Survey of Canada-Ottawa; Univ Az = University of Arizona, Tucson; UBC = University of British Columbia, Vancouver; vdH = University of British Columbia, Vancouver (van der Heyden thesis sample)
2  UTM Easting and Northing data converted from original NAD27 coordinates as determined from 1:50 000 scale topographic map
3  Inconclusive date, requires additional zircon grains
4  Inconclusive date, insufficient hornblende
5  Formerly Stick Pass plutonic suite
 
REFERENCES
Gehrels, G.E. and Boghossian, N.D., 2000. Reconnaissance geology and U-Pb geochronology of the west flank of the Coast Mountains between Bella Coola and Prince Rupert, coastal British Columbia. In Stowell, H.H. and McClelland, W.C., eds., Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia; Geological Society of America, Special Paper 343: 61-75.
 
Ray, G.E., Brown, J.A., Friedman, R.M., and Cornelius, S.B., 1998. Geology of the Nifty Zn-Pb-Ba prospect, Bella Coola district, British Columbia. In Geological Fieldwork 1997. A Summary of Field Activities and Current Research; British Columbia Geological Survey Branch, Paper 1998-1, pp. 20-1–20.28.
 
Rusmore, M.E., Woodsworth, G.J., and Gehrels, G.E., 2000. Late Cretaceous evolution of the eastern Coast Mountains, Bella Coola, British Columbia. In Stowell, H.H. and McClelland, W.C., eds., Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia; Geological Society of America Special Paper 343: 89-105.
 
Rusmore, M.E., Gehrels, G., and Woodsworth, G.J., 2001. Southern continuation of the Coast shear zone and Paleocene strain partitioning in British Columbia-southeast Alaska. Geological Society of America Bulletin, 113 (8): 961-975.
 
Struik, L.C., Hrudey, M.G., Mahoney, J.B., Diakow, L.J, Sparks, H.A., Kaiser, E.A., Gleeson, T.P., and Woodsworth, G.J., 2003. Geology, Necleetsconnay River area, British Columbia (93D/10 and part of 93D/07). Geological Survey of Canada, Open File 1463, geologic map, scale 1:50 000, 16 p.
 
van der Heyden, P., 2004. Uranium-lead and potassium-argon ages from eastern Bella Coola and adjacent parts of Anahim Lake and Mount Waddington map areas, west-central British Columbia. Geological Survey of Canada, Current Research 2004-A2, 14 p.
 
Wanless, R.K., Stevens, R.D., Lachance, G.R., and Rimsaite, J.Y.H., 1966. Age determinations and geological studies. K-Ar isotopic ages, Report 6. Geological Survey of Canada, Paper 65-17, 101 p.
 
Wanless, R.K., Stevens, R.D., Lachance, G.R., and Edmonds, C.M., 1967. Age determinations and geological studies. K-Ar isotopic ages, Report 7. Geological Survey of Canada, Paper 66-17, 120 p.
 
Wanless, R.K., Stevens, R.D., Lachance, G.R., and Edmonds, C.M., 1968. Age determinations and geological studies. K-Ar isotopic ages, Report 8. Geological Survey of Canada, Paper 67-2, Part A, 141 p.