LEGEND

This legend is common to maps 1635A, 1636A, 1637A, 1638A, coloured legend blocks indicate map units that appear on this map

OVERLAP ASSEMBLAGES

Til Lamprophyre

4 m J = > J x

JURASSIC AND CRETACEOUS

JKLR LITTLE RIVER STOCK: granodiorite and quartz monzonite

PERMIAN OR YOUNGER

Quartz porphyry rhyolite

QUESNEL TERRANE

TRIASSIC AND JURASSIC NORIAN AND (?) YOUNGER QUESNEL RIVER GROUP (ufa,- Wb)

Augite porphyry basalt breccia, minor flows, tuff and tuffaceous argillite; local andesitic basalt

Jb

Basaltic tuff and breccia, generally fine grained; argillite, flows, chert

UPPER TRIASSIC

KARNIAN AND (?) NORIAN Phyllite, argillite, slaty argillite, quartzite, schist, minor greenstone (subgreenschist to amphibolite (kyanite) facies of metamorphism); uka,g, conglomerate

Undivided uta, and greenstone, augite-porphyry breccia, tuff uhag breccia, tuff; possible dykes and sills (subgreenschist and greenschist facies of metamorphism)

SLIDE MOUNTAIN TERRANE

UPPER PALEOZOIC MISSISSIPPIAN TO PERMIAN SLIDE MOUNTAIN GROUP (PMub-uPA) ANTLER FORMATION: pillow basalt, breccia, diorite, chert, uPA greywacke, (minor limestone?); uPAu , serpentinite; uPAs , chert, minor basalt and diorite

CROOKED AMPHIBOLITE: undifferentiated; uPCu, serpentinite and sheared ultramafic rock; uPct , talcose altered ultramafic rock; uPca , amphibolite

Serpentinite and peridotite (as mapped by Campbell, 1978)

BARKERVILLE TERRANE LOWER PERMIAN

Sugar limestone: grey crinoidal limestone, minor grey chert

UPPER PALEOZOIC? SNOWSHOE GROUP (PB-uPim)

ISLAND MOUNTAIN AMPHIBOLITE: amphibolite, minor siliceous mylonite

uPSc Orange weathering fuchsite-bearing ankeritic carbonate

Hardscrabble Mountain succession: black siltite and phyllite, grey micaceous quartzite, limestone, minor metatuff?; uPHMs greywacke, muddy conglomerate

Bralco succession: marble

Foliated diorite and augite porphyry basalt, gabbroic rocks; includes undifferentiated diabase, diorite

Uv > _ m O N Qo e) ioe)

PALEOZOIC QUESNEL LAKE GNEISS

PQL Light grey potassium feldspar porphyritic granitic orthogneiss

SNOWSHOE GROUP (HR-PE)

Eaglesnest succession: olive and grey micaceous quartzite and phyllite

Downey succession: olive and grey micaceous quartzite and phyllite, and undifferentiated rocks; PDa , amphibolite, includes some marble, quartzite and schist; PDc, marble, includes some phyllite, schist, quartzite and amphibolite; Pop, phyllite, schist, metatuff, includes some marble, quartzite and amphibolite; Pov , metatuff, metadiorite, includes some marble, phyllite, schist and amphibolite; (metamorphism ranges from chlorite to kyanite grade)

> rs m O N fe) QO

Agnes succession: quartzite clast conglomerate, quartzite, minor limy conglomerate

Goose Peak succession: quartzite, minor conglomerate

Harveys Ridge succession: dark grey and grey micaceous quartzite, black quartzite and interbedded dark grey phyllite, schist, siltite, and minor micritic limestone and undifferentiated rocks; PHRc, limestone and limestone conglomerate; PHRs , purple grey very micaceous quartzite and black phyllite; PHRv, grey slate and green metatuff, in part calcareous

HADRYNIAN OR PALEOZOIC

HPT Tom succession: olive grey micaceous quartzite, phyllite and schist

HADRYNIAN?

Keithley succession: grey and olive, fine micaceous quartzite and phyllite, minor marble; HKEm , marble, phyllite; HKEp, grey and green phyllite, minor olive quartzite; HKEq, white to dark grey quarizite

Kee Khan marble: marble, calcareous sandstone, micaceous HKK quartzite, green and grey phyllite, in part calcareous

Tregillus succession: grey and olive-grey micaceous quarizite, phyllite and schist; undifferentiated HTg, conglomerate

= 4

Ramos succession: olive and olive grey micaceous quartzite, and phyllite, light brown and grey sandstone and undifferentiated rocks; HRs, phyllite, schist, quartzite, calc-silicate rocks, may be partly equivalent to HKE ; HRc, limestone, calcareous quarizite; HRp, black siltite, phyllite and slate, may be partly equivalent to PHR; HRq, olive and grey slate and micaceous quarizite, may be part of HKE

Snowshoe Group undifferentiated: HR to PE, mainly PHR to PE

Campbell, R.B.

CARIBOO TERRANE PERMIAN AND/OR TRIASSIC

Pts Olive and grey greywacke and slate

PENNSYLVANIAN

Pc Grey fusulinid and pelletoidal limestone

MIDDLE PENNSYLVANIAN

AA ALEX ALLAN FORMATION: black micritic limestone, grey and

f

black shale ORDOVICIAN TO MISSISSIPPIAN MISSISSIPPIAN OR YOUNGER

BLACK STUART GROUP (SDss- MBs)

Sandstone unit: olive grey micaceous and white quartzite, black MBS and pink chert

LOWER MISSISSIPPIAN

MG GREENBERRY FORMATION: crinoidal limestone, chert, dolostone

UPPER DEVONIAN AND LOWER MISSISSIPPIAN

GUYET FORMATION: muddy and sandy conglomerate and DMG af : breccia, granule quartzite and slate

MIDDLE AND/OR UPPER DEVONIAN

WAVERLY FORMATION: schistose, calcareous, basaltic tuff, and

Ww volcaniclastics, pillow basalt, minor siltite

i.

UPPER ORDOVICIAN AND DEVONIAN TO MISSISSIPPIAN OR YOUNGER

OMBs Black pelite unit: black slate, argillite and cherty argillite, black limestone, dolostone and silicified limestone (in part amphiporal)

UPPER SILURIAN AND LOWER DEVONIAN

Chert-carbonate unit: light to dark grey chert breccia, grey SDBs limestone matrix, dolostone granule to pebble breccia, limestone matrix, chert-quartz-dolostone conglomerate to breccia

CAMBRIAN TO (?) DEVONIAN

€DsBs Black Stuart formation (as used by Campbell, 1978)

HADRYNIAN AND CAMBRIAN LOWER TO (?) UPPER CAMBRIAN CARIBOO GROUP (HI-€pc)

€Dc DOME CREEK FORMATION: dark shale and limy shale

LOWER CAMBRIAN

IM MURAL FORMATION: grey limestone, minor shale and argillite

HADRYNIAN AND/OR CAMBRIAN

MIDAS FORMATION: dark siltstone and quartzite, minor shale and argillite

H&M

YANKS PEAK FORMATION: grey and white, minor pink and | H€yp green quartzite, minor siltstone and argillite

MIDAS, YANKS PEAK AND YANKEE BELLE FORMATIONS: H€u undivided

HADRYNIAN (WINDERMERE) YANKEE BELLE FORMATION: green and grey thin bedded HYB argillite, shale, minor quartzite and limestone; local phyllite and schist

CUNNINGHAM FORMATION: grey limestone, minor shale, argillite and dolostone

ISAAC FORMATION: dark phyllite, calcareous phyllite, slate, argillite, and minor limestone and micaceous quartzite

H€cu Cariboo Group undifferentiated:

KAZA GROUP

Greywacke, argillite, phyllite, schist, minor pebble conglomerate

x > D = x< 2 ?) > Zz

IGNEOUS ROCKS OF UNKNOWN TERRANE AFFINITY MISSISSIPPIAN OR YOUNGER

Diabase, diorite

Calc-sillicate rocks (isolated outcrops) ............ 0.000 c cece ee CS x Geological boundary (defined, approximate, assumed) ........ Yi Wie Bedding, tops known (inclined, overturned) ...............0..00005 Fie Bedding, tops unknown (inclined, vertical) ................0..000-. Va Xe Bedding parallel to cleavage (inclined, overturned) ................. Us Cleavage, first generation (horizontal, inclined, vertical) ........ ae YEG Cleavage, second generation (inclined, vertical) ................. ee x Fault (defined, approximate, assumed) solid circle indicates

COWNTATOWSSIOO aerate le eee ranean oe av ereNeys neeienaeees cere SS Thrust fault (defined, approximate or assumed)

hangingwallsteethivg en wus) ct- ce cond. sata s eons eae eee er TS Anticline (upright, overturned) arrow indicates plunge ......... =p Sie Syncline (upright, overturned) arrow indicates plunge.......... +— - ANTHONN ree cree eR ree) Roe ao ene ees eee een ed pret ee ne +

: , : : 10 15

"oie cae aera) oat eel ea ayy AE AE Pebble long axis, average wend and plunge ........... 0... cece eee VE LR TADAC: SASS Meech hee ar ea ee aa tact ons Bee Icke apt ee Bien UH Cae eae Dan 1 FOSSIPIOCAlity rrp ers erates cc airtel tn daly Neat Serene aree tee OES © Garnet isograd (half moon on higher grace side)............... oy eee Ce

Border of detailed geology as mapped by Struik, reconnaisance geology beyond the border is from the McBride map area (Campbell, Mountjoy and Young, 1973) and the Quesnel Lake map area (Gampbellaei 97.8) ery wines te er tee air

1978: Quesnel Lake (93A) map area; Geological Survey of Canada, Open File 574.

Campbell, R.B., Mountjoy, E.W., and Young, F.G.

1973: Geology of McBride map area, British Columbia; Geological Survey of Canada,

Paper 72-35

Recommended citation:

Struik, L.C.

1988: Geology, Swift River, Cariboo Land District, British Columbia; Geological Survey of Canada, Map 1637A, scale 1:50 000

Dey Energy, Mines and Energie, Mines et

Resources Canada Ressources Canada Geological Survey Commission géologique of Canada du Canada

122°00'

53°00444

52°45 1

122°00'

35!

121°30' 53°00’

52°45' 121°30'

Copies of this map may be obtained from the Geological Survey of Canada: 601 Booth Street, Ottawa, Ontario K1A 0E8

3303-33rd Street, N.W., Calgary, Alberta T2L 2A7 100 West Pender Street, Vancouver, B.C. V6B 1R8

INDEX MAP

Geology by L.C. Struik, 1977-1982

Geological cartography by D.G. Brown, Geological Survey of Canada

Any revisions or additional geological information known to the user would be welcomed by the Geological Survey of Canada

Base map at the same scale published by the Surveys and Mapping Branch in 1976. Roads were revised by the Geological Survey of Canada for this edition

MAP 1637A GEOLOGY

SWIFT RIVER

CARIBOO LAND DISTRICT BRITISH COLUMBIA

Scale 1:50 000 - Echelle 1/50 000

Kilometres 1 0 1 2 3 4 Kilométres — a ——_ a ———— | | Universal Transverse Mercator Projection Projection transverse universelle de Mercator © Crown Copyrights reserved © Droits de la Couronne réservés {ADT wastaarne NORTH VA i ae TION MICTDINT birppanM

Copies of the topographical editions covering this map area may be obtained from the Canada Map Office, Department of Energy, Mines and Resources, Ottawa, Ontario K1A OE9

Approximate magnetic declination 1986, 23°01’ East, decreasing 14.8 annually.

Elevations in feet above mean sea level

Printed by the Surveys and Mapping Branch. Published 1988

93G/8 ie HIS 93 H/6 93G/1 93H/4 93H/3 93H/2 1635A 1636A ie 2 3 93 Al14 93/15 4 1638A A

NATIONAL TOPOGRAPHIC SYSTEM REFERENCE AND INDEX TO ADJOINING GEOLOGICAL SURVEY OF CANADA MAPS

SWIFT RIVER CARIBOO LAND DISTRICT BRITISH COLUMBIA

NORTH VANCOUVER DISTRICT LIBRARY