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120°00' 112°00' QUATERNARY TURMOIL KLIPPE: Rocks of Turmoil klippe structurally overlie rocks of Coronation Supergroup and Slave craton. They are interpreted to be part of Hottah terrane 119°00' 113°00' 68°00' 68°00' Unconsolidated sediments. 118°00' 114°00' Q Leucogranite: predominantly biotite leucogranite, crosscuts basal contact of Turmoil 117°00' 116°00' 115°00' Wlg klippe. FCg PALEOZOIC FCg Undifferentiated sedimentary rocks: thinly-bedded to laminated shale, mudstone, P 0 PR FCg siltstone, columnar stromatolitic dolomite, minor dolarenite and sandstone; rare Wmyl Mylonitic rocks of uncertain age; dominantly granitic protoliths. 0 PR FCg P 6 FCg Rae River 200 PR gypsum. FCg P PR FCg PR 00 4 NEOPROTEROZOIC HEPBURN INTRUSIVE SUITE (1.900-1.882 Ga; Bowring, 1984) FCg FCg FCg FCg PR PR FCg Coronation sills: gabbro, minor ultramafic cumulate and granophyre WHo Okrark sills: feldspar porphyritic sills of hypabyssal rhyolite, variably foliated and/or PR FCg FCg I O N G U L F (723 Ma; Heaman et al., 1992). lineated. FCg C O R O N A T

PR Rich Kugluktuk FCg ardso FCg PR n Ri FCg FCg Syenite: massive pyroxene-amphibole-alkali feldspar syenite, hornblende-biotite N ver FCg Gunbarrel gabbro: medium- to coarse-grained gabbro, forms a gently-inclined O FCg dgg WHs monzonite and quartz monzodiorite (1886 ± 6 Ma; Bowring, 1984). R FCg FCg northeast striking sheet (779.6 ± 1.4 Ma; Harlan et al., 2003). T N H U W N E A PR PR FCg ST V T U FCg FCg Calder gabbro: medium- to coarse-grained gabbro, forms gently-inclined northeast Quartz diorite, diorite, gabbro, norite: massive to weakly-foliated; agmatitic in places 0 T DG FCg 0 E FCg 4 R FCg dc WHd (1882 ± 15 Ma; Bowring, 1984). R CCb striking sheets (779.5 ± 1.8 Ma; Harlan et al., 2003). I TO R FCg PR I ES PR WEo WEr ROCKS OF THE COPPERMINE HOMOCLINE ‘Younger’ granite: massive biotite leuco-monzogranite. FCg WHb FCg FCg NEOPROTEROZOIC AND/OR MESOPROTEROZOIC P PR PR CCb A RAE GROUP Basal sandstone, siltstone, shale and local regolith overlain by reddish to grey cherty Biotite tonalite and granodiorite: typically with alkali feldspar megacrystic border PR dolostone; siltstone, mudstone, silty sandstone; upper cream to orange stromatolitic WHt zones; weakly foliated. FCg dolomite. CHs FCg DG DG WEo CHs MESOPROTEROZOIC WEo FCg ‘Older’ granite: foliated to mylonitic biotite granite, strongly porphyritic in places; may 36 FCg 30' CCb 0 30' COPPERMINE RIVER GROUP WHf CCb DK DS contain abundant metasedimentary enclaves. WEr HUSKY CREEK FORMATION DS CCb WEr CHb DF DS CHs Red sandstone and siltstone. DK DD CHs Garnet granite: mainly biotite granite with accessory garnet, (1887 ± 4 Ma; Bowring, D WHgg 1984); locally contains large tabular alkali feldspar phenocrysts and metasedimentary HL i P CHb FCg HL sm CHs enclaves. al DG WEo FCg DD WGgr L FCg DF WGgr a WEo DD k DG WEo es P WEr Red sandstone and siltstone intercalated with basalt flows. CHs WEr CHb FCg WHg Sheared biotite-hornblende granite: commonly with amphibolite inclusions. WEr FCg WGgr WR WGMs WGMs CHb DK HK HL DL WEo COPPER CREEK FORMATION: Basalt flows and associated breccia, minor sandstone. AKAITCHO GROUP AND BENT GNEISS HE DS FCg CCb HL Undivided rocks of Turmoil klippe: includes gneissic rocks of both igneous and HE WR DD DL 4 WEr 0 WR sedimentary origin (Bent gneiss) and an unconformably overlying sequence (Akaitcho 0 Wm 0 Wa 40 DD MUSKOX INTRUSION (1270 Ma; LeCheminant and Heaman, 1989) Group) of sandstone-siltstone, commonly pyritic, overlain by basaltic and rhyolitic HK 4 CCb Q 8 Kikerk lavas (1.903–1.889 Ga; Bowring, 1984), minor carbonate; includes gabbroic sills; HL DS 0 DG WEr WEo Wm Lake complexly deformed and metamorphosed. Wag: granite. HL WMd WEo WR Cm Gabbro, peridotite, granophyre, websterite. HE CCb Cg DD HOTTAH TERRANE WGg WGMs 0 DF WR 44 Rocks of Hottah terrane occur in the western half of Wopmay orogen HE DG WEr WGg Wm and are interpreted on the basis of lithology, age, and geological relations Coppermine River 240 to be exotic with respect to rocks of Slave craton and Coronation Supergroup DG DS DK FCg Cg Mafic sills of gabbro, diabase, minor granophyre. DK DS WEr WEo DG WEo BELL ISLAND BAY GROUP HK WMd HL DS WR FCg DISMAL LAKES GROUP Basal sandstone and conglomerate overlain by basaltic, andesitic, dacitic, and WGMs Wag GREENHORN LAKES FORMATION: Thin- to medium-bedded dolostone with DS DD WM WB rhyolitic tuff, lava and breccia (1898 ± 7 Ma; Reichenbach, 1991); intercalated CCb DK v stromatolites, cryptalgal laminites, intraclastic breccia, oolite, dolomitic shale, sandstone and mudstone. WGg WEo megabreccia and karstic breccia; local cyclic, medium-bedded dolostone with flat WGg DL DS WEo cryptalgal laminites alternating with thickly-bedded stromatolitic biostromes. Q WMs WEr UNDIFFERENTIATED PLUTONIC ROCKS OF HOTTAH TERRANE WGMs DL DS DF SULKY FORMATION: Planar-bedded to stromatolitic dololutite with interbedded Greenhorn Cm DL Biotite-hornblende granodiorite and monzogranite; minor diorite, quartz diorite, WMs black shale, massive stromatolitic dolomite, cherty carbonate with pisolites, silicified WHp DD Sulky Lake Lakes DK gabbro; 1914 ± 5 Ma and 1902 ± 7 Ma (Bowring, 1984). Q DK DD DD evaporites and tepee structures. 6 WGg 67°00' HE 00 67°00' WGMld DL WEr WEr HOLLY LAKE METAMORPHIC SUITE Wa WEo WEr Q KENDALL RIVER FORMATION: Cherty dolostone, minor chert, silicified evaporites, DK DD WR DK minor black shale, stromatolitic bioherms at top. Cordierite-muscovite schist; sillimanite-mica schist; meta-andesite, basaltic lava and WHm breccia, amphibolite; minor intrusive rocks (2.3-1.94 Ga; Bowring, 1984). HE DD 240 HE HB HK A WMs WEr DL WGg WGg DEASE LAKE FORMATION: Cherty dolostone with lenses of mudstone containing halite HK Cm CORONATION MARGIN DS HK DD casts and rare pisolites; dolomitic sandstone, oolitic dolostone, stromatolitic biostromes, HE HE WGgr WEr WEo intraclastic breccia, mudstone, dololutite; highly contorted megabreccia near Greenhorn WEr HL 0 DL 2 and Sulky lakes. MOREL AND PENINSULAR SILLS DF 7 Kiglikavik WGm HL dW 60 WEo dW HE 0 WGg Lake Mafic to intermediate sills; deformed and metamorphosed; mainly forms a linear HE HL HL WEo A Wm swarm intruding the Rocknest Formation shelf edge; includes large sills to the east Dease Arm WGMs WGp FORT CONFIDENCE FORMATION: Sandy shale, minor sandstone. (Peninsular sills at Napatuklik Lake, 1871±1 Ma, Hamilton, unpublished data cited in WGg WR DF Buchan et al., 2010). HE HE HL WGMld WHgg WEo WR dW Q WGp HL Q WMv CORONATION SUPERGROUP WGMld HB WR WEr Wm TAKIYUAK FORMATION: Brick-red lithic sandstone; minor siltstone and HL WHo WMs DL LEROUX FORMATION: White to grey quartz arenite, conglomeratic litharenite at base. conglomerate; large-scale planar cross-bedding (easterly-directed paleocurrents); HN Q WHt WT A Wa Cm WEo carbonate-clast megabreccia (solution-collapse breccia?) at the base. 0 WHf 0 WHo 4 A WEo HL HN HL WEr WESTERN CHANNEL DIABASE (1.591 Ga; Hamilton and Buchan, 2007) COWLES FORMATION AND KIKERK FORMATION HL WGp WGgr Q WR WGg WEo WEr COWLES FORMATION: Greenish-grey argillaceous limestone rhythmite; minor HB Diabase, gabbro. abiotic stromatolite (seafloor carbonate cement); minor distal feldsphathic-lithic wacke HN A dW WCk WGp Wa turbidites. HN WHt HB WGgr WGgr WEr KIKERK FORMATION: Grey argillite with nodular calcareous concretions; minor HB WHt WR distal feldspathic-lithic wacke turbidites. WGMs WHo WEo PALEOPROTEROZOIC dW WGMs WHf WR WEo WGMld HORNBY BAY GROUP RECLUSE GROUP 0 0 0 6 2 3 WHt WEo ASIAK, FONTANO AND TREE RIVER FORMATIONS WHt Cm NARAKAY VOLCANIC COMPLEX: Mafic lapilli tuff, breccia and ashstone; lithic-rich WGgr HN siliceous ash-flow tuff, rhyolitic flows and associated porphyritic intrusions ASIAK FORMATION: Proximal feldspathic-lithic wackes turbidites; minor grey argillite; WGp WEr WEr (1.663 Ga; Bowring and Ross, 1985). flute clasts indicate south-directed turbidity-current flow; thickens westward; HL Wa WHo WEo WR WGMs WGMs WGp HB Wa intertongues with Fontano, Kikerk and Cowles formations, its base climbing stratigraphically upward from west to east. dW HL WHo 0 WGg 0 30' FONTANO FORMATION: Steel-grey pyritic argillite with regularly-spaced 30' HB 4 KAERTOK FORMATION: Sandstone, mudstone, minor carbonate. WGgr WGd WEr WR HK carbonaceous laminations; tuff bed dated at 1882 ± 4 Ma (Bowring and Grotzinger, dW Hornby Bay C 1992). WGp o p 4 TREE RIVER FORMATION: Pale greenish-grey glauconitic sandstone and siltstone; p 0 WHg WGMs 0 Wa WHgg e WGp r minor granular ironstone: thickens eastward; conformably overlies Rocknest HB m Q dW WGg Wa i WEr WEr EAST RIVER FORMATION: Oolitic calcarenite, laminated and stromatolitic dolostone, Formation to the west, disconformably to the east. n A Wa e HE intraformational conglomerate, minor quartz arenite, evaporite and mudstone. HL WHf R WHb i Wa v EPWORTH GROUP dW WGp WGg e Wm WEo WHd r WEo dW WGMld WHgg ROCKNEST FORMATION: West-facing carbonate-dominated rimmed-shelf and WHo WHf WR Wa WHd Wa WEr slope assemblage; inner-shelf succession of 140–160 upward-shoaling cycles Wa WEr LADY NYE FORMATION: Buff, white and purple sandstone, conglomerate, minor comprised of lagoonal dolomitic argillite and peritidal stromatolitic dolostone with WHb WHb Wm HL mudstone. WGMld WGd Wa WMs WR abundant seafloor cement; shelf rim of non-cyclic supratidal dolostone of tepee and WGgr WGg WEr tepee-breccia facies; outer shore facies of dolostone grainstone and elongate, Wa laterally-linked, columnar stromatolites and stromatolite bioherms, locally with WGgr WHb WR WGgr BIGBEAR FORMATION AND RIVER FORMATION: Red to buff conglomerate, Neptunian dykes; starved scarp and slope facies of dolostone rhythmite, rhythmite WHb WR HB breccia and proximal megabreccia. WGg sandstone; minor mudstone and breccia. WGp WGd WHt WEr WCk Wm WHo WHt WR WGMs WGgr WEo WHt ODJICK FORMATION: Storm-dominated marine shelf assemblage of quartz- and WGMs WGp 00 WMv WGgr HB 4 ROCKS OF WOPMAY OROGEN sub-feldspathic arenite, siltstone and greenish argillite; minor stromatolitic dolostone WGgr WGMld Q WEr WEo WHt Cm WR and conglomerate near the base; basaltic pillow lava and hyaloclastic breccia locally Wa Wa WEo WMs WEo GREAT BEAR MAGMATIC ZONE developed at north end of Napaktulik Lake; basal unconformity, nonconformity with WHf Archean basement in the east, depositional (?) contact with Stanbridge Formation GREAT BEAR BATHOLITH (1.876–1.843 Ga; Bowring, 1984) WGgr A A to the west; crossbedded sandstone with west-directed paleocurrents in the east; WHd WHt Cm Napaktulik Lake Granite suite: medium to coarse-grained biotite granite; includes potassium feldspar WHb Wm WEo 1969 ± 1 Ma (Bowring and Grotzinger, 1992); may locally include minor Archean WR porphyritic phases; minor granodiorite; also includes rocks of the Bishop intrusive WGg metasedimentary rocks in the Exmouth Lake area. WHt Vaillant WCk suite (St-Onge et al., 1991) (two colors are used to portray individual plutons and WGgr Lake intrusions of the suite). WR WEr MELVILLE GROUP WGg WHt WHb WEr WGm WGMs WHf Granodiorite-monzogranite suite: medium-grained hornblende-biotite and biotite STANBRIDGE FORMATION: Cherty stromatolitic dolostone and quartz-arenaceous M c T A V I S H A R M WHg Cm WEr WGp WR hornblende monzogranite, quartz monzonite, and granodiorite (three colors are used WMs dolostone; minor basalt and pelite. Wa 4 to portray individual plutons of the suite). WGgr WEo WR 40 WHt WEr WT G R E A T B E A R L A K E WGp WHgg WHd WHt WEo WEo WGg VAILLANT FORMATION: Basaltic pillow lava, hyaloclastic breccia and tuff; WGMld WGg Wa porphyritic metabasalt at base; rhyolite lava locally at top in the Vaillant Lake area; WHd Wa Wm Diorite-gabbro suite: mainly hornblende and/or pyroxene diorite, quartz diorite, gabbro. WMv WGgr Q WGd 2014.5 ±1 Ma (Bowring, personal communication). WGm WGp Q 66°00' WEo Cg 66°00' WHd Wa WHf WEr Q WEr A DRILL FORMATION: Feldspathic and sub-feldspathic granulestone turbidites; black WGgr WHf WHd WR WGm WHb A Wm Hypabyssal porphryry: porphyritic intrusions with variable proportions of alkali feldspar, carbonaceous pelite and semipelite; quartz- and granite-cobble conglomerate with WGg WHo WGp WMd WHd WR plagioclase, hornblende, biotite and quartz phenocrysts. outsized dolostone clasts; minor basaltic flows tuffs and sills; minor crystal-rich felsic WHt WHb WEo tuffs with associated carbonate and jasperite beds. WHd WGg WHg Wa WEr dw Wa WEr WGd WHt Early intermediate intrusive suite: hornblende monzonite, monzodiorite, quartz ARCHEAN WGMs WCk monzonite, pseudosyenite, granite, diorite; typically with broad hydrothermal alteration 0 WCk HL WGg WHf 0 WGm WHd 4 haloes within adjacent host rocks; several members of this suite are demonstrably A Undifferentiated metamorphic and plutonic rocks of Slave craton (4.03–2.5 Ga). WGg 200 Wmyl coeval with rocks of the LaBine Group. 2 WHd WR 0 WGd Wa

0 WHd WGgr WHf MACTAVISH SUPERGROUP (1.878–1.844 Ga; Bowring, 1984) WGp WHd Wa SLOAN GROUP WGgr WGMld Wa WHd Geological boundary (defined) WGd WHd Mainly intermediate and siliceous ash-flow tuff, both intracaldera and outflow sheets; WGg WGd Wa WHb WHt WGMs lesser amounts of andesitic lava and terrigenous siliciclastic rocks; intrusive porphyry. WEo Limit of mapping Richardson Island WHt WEo WGm WGd WGg ð ð ð ð ð ð ð WHb Thrust fault: teeth on upper plate WHd WEr LABINE GROUP | DUMAS GROUP WGMs WHf Basal sandstone overlain by pillow basalts; includes gabbroic sills; basaltic-andesitic- Conjuror Bay WHg Wa Normal fault: ticks on down-dropped side WGg WGg dc dacitic-rhyolitic lavas and intermediate composition ash-flow tuff, both intracaldera WHb WHd A WGMld WHt and outflow sheets; siliciclastic sedimentary rocks and minor carbonate; intrusive WGd A Transcurrent fault; predominantly northeast set is right lateral,northwest set is left WHp WMs porphyry. WGg WGg WGp WEo lateral WGMld WGMs WGgr Wm 44 WEr WGp Wa 0 WEr WHm WGgr WGg A WGd WHd dc WHf WHt 440 WGg WGg dc WHd Q WGp WGg WHp WGg WGMs dgg Wa WMs 120°W 112°W WHd WR REFERENCES 116°W WGgr dc WGd 68°N 68°N WGd WGd WEr WGg WHt WGm WMv WMv Baragar, W.R.A. and Donaldson, J.A., 1969. Geology, Coppermine, District of MacKenzie; Geological Survey of 1338A 1337A WGMs WGgr WHb Canada, Map 1337A, scale 1:250 000. 4 WHm 00 HL dc WEr Scale: 1:50 000 WEr WEr 30' WEo 30' Baragar, W.R.A. and Donaldson, J.A., 1969. Geology, Dismal Lakes, District of MacKenzie; Geological Survey of WHm WHp Wm Canada, Map 1338A, scale 1:250 000. Scale: 1:125 000 HK WHm OF3251 dgg 0 WGd 1663A 0 WHb

2 WGg Bowring, S.A., 1984. Uranium-lead zircon geochronology of Early Proterozoic Wopmay Orogen, Northwest Territories, WGg A 67°N 67°N HE WGm WGgr Canada: An example of rapid crustal evolution; Ph.D. thesis, University of Kansas, Lawrence, Kansas, 148 p. Scale: 1:250 000 WGg WGg WGd WGMld WMv Bowring, S.A. and Grotzinger, J.P., 1992. Implications of new chronostratigraphy for tectonic evolution of Wopmay WHp dc WGg WGg A orogen, northwest Canadian Shield; American Journal of Science, v. 292, p. 1–20. Wa WEr WGg WGg WGMs Bowring, S.A. and Ross, G.M, 1985. Geochronology of the Narakay Volcanic Complex: Implications for the age of the

WGp A Wmyl WGg Coppermine Homocline and Mackenzie igneous events; Canadian Journal of Earth Sciences, v. 22, p. 774–781. 6 1576A 1384A WMv WEo 4

5 WGg WGMld WMv 1 4 Wa WGg 0 Buchan, K.L., Ernst, R.E., Bleeker, W., Davis, W.J., Villeneuve, M., van Breemen, O., Hamilton, M.A., and 66°N 66°N 0 2 WHp 0 Söderlund, U., 2010. Proterozoic magmatic events of the Slave Craton, Wopmay Orogen and environs; Geological 0 P WGMld WGgr WGgr WGg WHb Survey of Canada, Open File 5985, 26 p, 1 CD-ROM. WHm WHp WHs WMs Point Lake dc A 3 Fraser, J.A., 1973. The Epworth Group, Rocknest Lake area; Geological Survey of Canada, Map 1384A, 6 6 1589A WGg WGgr scale 1:250 000. 1 WGg dc WHp WGd Hamilton, M. and Buchan, K., 2007. Precise 1.59 Ga age for Western Channel diabase, Wopmay orogen: Implications Hildebrand Hildebrand et al., for Laurentia APWP and reconstructions of Laurentia, Baltica and Gawler craton; Geological Society of America, in progress in progress 1754A WHp WGg WHb 65°N Wlg Abstracts with Programs, v. 39, no. 6, p. 285. 65°N HL WGg WGgr 120°W 116°W 112°W WGg dc Wa Harlan, S.S., Heaman, L., LeCheminant, A.N., and Premo, W.R., 2003. Gunbarrel mafic magmatic event: A key 780 Ma 0 Wlg 0 WGd Wlg WMs 4 time marker for Rodinia plate reconstructions; Geology, v. 31, p. 1053–1056. WGg WGg WGMs WGMld Figure 1. Sources of geological data : WGg WGMld Heaman, L.M., LeCheminant, A.N., and Rainbird, R.H., 1992. Nature and timing of Franklin igneous events, Canada: WHm WHb WGgr P Implications for a Late Proterozoic mantle plume and the break-up of Laurentia; Earth and Planetary Science 1337A: Baragar, W.R.A. and Donaldson, J.A., 1969. Letters, v. 109, p. 117–131. WHm WGd WGgr 1338A: Baragar, W.R.A. and Donaldson, J.A., 1969. WGg Wlg WHp WGg Hildebrand, R.S., 1983. Geology, Echo Bay-MacAlpine Channel area, District of Mackenzie, Northwest Territories; 1384A: Fraser, J.A., 1973. Q WGgr A WGgr Geological Survey of Canada, Map 1546A, scale 1:50 000. 1546A: Hildebrand, R.S., 1983. dc WGd WHb ttah Lake WMv 1576A: Hoffman, P.F., 1984. Ho WGgr Wa Hildebrand, R.S., 1985. Rainy Lake-White Eagle Falls area, District of Mackenzie, Northwest Territories; Geological WGp Wa 1589A: Hildebrand, R.S., 1985. WHp A WMs Survey of Canada, Map 1589A, scale 1:50 000. Q WGd 1663A: Ross, G.M., and Kerans, C., 1984. WB Hildebrand, R.S., Hoffman, P.F., and Bowring, S.A., 2010. The Calderian orogeny in Wopmay orogen (1.9 Ga), 1754A: St-Onge, M.R., King, J.E., and Lalonde, A.E., 1991. WHm WGd WGMld Turmoil Lake WGMld WB northwestern Canadian Shield; Geological Society of America Bulletin, v. 122, p. 794–814. WHp OF3251: Hoffman, P.F., and Tirrul, R., 1996. WGgr WHs WMv WGd WGd WEo Hoffman, P.F., 1984. Geology, northern internides of Wopmay Orogen, District of Mackenzie, Northwest Territories; WHp Geological Survey of Canada, Map 1576A, scale 1:250 000. WHp WGg WGg WMs WB WHp Hoffman, P.F., and Tirrul, R., 1996. Geology, northern externides of Wopmay Orogen, District of Mackenzie, Northwest dc WGMs WHs 65°00' WGgr Wopmay Lake 65°00' Territories; Geological Survey of Canada, Open File 3251, scale 1:250 000. WHp WEo LeCheminant, A.N. and Heaman, L.M., 1989. Mackenzie igneous events, Canada: Middle Proterozoic hotspot WGd WHp WB A magmatism associated with ocean opening; Earth and Planetary Science Letters, v. 96, p. 38–48. Wa 112°00' 120°00' WGg Exmouth Lake Reichenbach, I.G., 1991. The Bell Island Bay Group, remnant of an early Proterozoic ensialic marginal basin in Wopmay O P E N F I L E Open files are products 119°00' 113°00' Orogen, District of Mackenzie; Geological Survey of Canada, Paper 88-28, 43 p. that have not gone 118°00' 114°00' D O S S I E R P U B L I C through the GSC formal 117°00' 116°00' 115°00' Ross, G.M., and Kerans, C., 1984. Hornby Bay and Dismal Lakes groups, Coppermine Homocline; Geological Survey of publication process. This publication is available from the Geological Survey of Canada, Map 1663A, scale 1:250 000. Canada Bookstore (http://gsc.nrcan.gc.ca/bookstore_e.php) 6390 and also from the Northwest Territories Geoscience Office St-Onge, M.R., King, J.E., and Lalonde, A.E., 1991. Geology, east-central Wopmay Orogen, District of Mackenzie, Les dossiers publics sont (http://www.nwtgeoscience.ca). It can also be downloaded Northwest Territories; Geological Survey of Canada, Map 1754A, scale 1:125 000. GEOLOGICAL SURVEY OF CANADA des produits qui n’ont free of charge from GeoPub (http://geopub.nrcan.gc.ca/). COMMISSION GÉOLOGIQUE DU CANADA pas été soumis au processus officiel de Author: R. S. Hildebrand GSC OPEN FILE 6390 For additional information on the geological evolution of the Northern Wopmay Orogen, the reader is refered to 2011 publication de la CGC. B (Hildebrand et al. 2010) and references therein. NTGO OPEN REPORT 2010-011 97 A 87 B 87 A 77 Geology: see Fig.1 showing sources of geological data GEOLOGICAL SYNTHESIS O P E N R E P O R T 96-O 76 N 96 P 86 M 86 N 86-O 86 P 76 M Any revisions or additional geological information known to the user 2010-011 Geological compilation by R.S. Hildebrand, 2010 would be welcomed by the Geological Survey of Canada 96 76 K NORTHERN WOPMAY OROGEN/ J 96-I 86 L 86 K 86 J 86-I 76 L OF6390 NORTHWEST TERRITORIES GEOSCIENCE OFFICE Digital cartography by R. Boivin, Data Dissemination Division (DDD), Digital base map from data compiled by Geomatics Canada, modified by DDD 96 G 96 76 E 76 F P. Brouillette and A. Morin (GSC-Québec) COPPERMINE HOMOCLINE H 86 E 86 F 86 G 86 H 2011 96 B 76 C NORTHWEST TERRITORIES – NUNAVUT Proximity to the North Magnetic Pole causes the magnetic compass to be useless in this area 96 A 86 D 86 C 86 B 86 A 76 D Reviewed by M. Lambert, formerly of the Geological Survey of Canada, L. Corriveau, Geological Survey of Canada and V. Jackson, Northwest Territories Geoscience Office Scale 1:500 000/Échelle 1/500 000 Mean magnetic declination 2011, 21°21'E, decreasing 37.0' annually. NATIONAL TOPOGRAPHIC SYSTEM REFERENCE LOCATION MAP kilometres 10 0 10 20 30 40 kilomètres Readings vary from 17°55'E in the SE corner Recommended citation: to 24°5'E in the NW corner of the map Hildebrand, R.S., 2011. Geological synthesis, Northern Wopmay Joint initiative of the Geological Survey of Canada and Northwest Territories Geoscience Universal Transverse Mercator Projection Projection transverse universelle de Mercator Orogen/Coppermine Homocline, Northwest Territories – Nunavut; Geological Survey of Canada, Open File 6390; Northwest Office, conducted under the auspices of the IOCG Great Bear as part of Natural North American Datum 1983 Système de référence géodésique nord-américain, 1983 Territories Geoscience Office, Open Report 2010-011, Resources Canada’s Geomapping for Energy and Minerals (GEM) program © Her Majesty the Queen in Right of Canada 2011 © Sa Majesté la Reine du chef du Canada 2011 Elevations in metres above mean sea level scale 1:500 000. doi:10.4095/287890