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Ministry of Energy Mines and Responsible for Core Review

094L Geological Legend

 

LAYERED ROCKS

CENOZOIC

PALEOGENE

fTS

SIFTON FORMATION: Shale, siltstone, sandstone, conglomerate; non-marine, fault-trough deposits.

MESOZOIC

MIDDLE - UPPER JURASSIC

JBL

BOWSER LAKE GROUP: Marine and non-marine shale, siltstone, sandstone, conglomerate.

UPPER TRIASSIC - LOWER JURASSIC

tJT

TAKLA GROUP: Andesitic to basaltic augite-feldspar porphyritic volcanic flows, breccia, tuff, volcaniclastics, sediments. (Quesnellia terrane)

UPPER TRIASSIC

tS

STUHINI GROUP: Andesitic to basaltic augite-feldspar porphyritic flows, breccia, tuff, volcaniclastics. (Stikinia terrane)

DEVONIAN - TRIASSIC

Dt

Volcaniclastic and pyroclastic rocks, basaltic to dacitic volcanics, chert, limestone. (Quesnellia terrane, Harper Ranch subterrane)

DEVONIAN - PERMIAN

DF

Basaltic to rhyolitic volcanic and pyroclastic rocks; limestone, shale, schist, volcanic sandstone, chert. (Stikinia terrane)

DEVONIAN - CARBONIFEROUS

Dc

Limestone, dolostone, sandy dolostone, sandstone, shale. (Cassiar terrane)

MIDDLE DEVONIAN - MISSISSIPPIAN

DmE

EARN GROUP: Black or blue-grey siliceous shale or slate, black quartz sandstone and siltstone, cherty argillite; locally calcareous or baritic. Minor chert-pebble conglomerate. May include younger and older units locally. (Ancestral North America)

CAMBRIAN - DEVONIAN

CDC

Undifferentiated Kechika, Road River, Sandpile groups, and Devonian units. (Cassiar terrane)

UPPER CAMBRIAN - LOWER DEVONIAN

CDKR

Undifferentiated Kechika and Road River groups. (Ancestral North America)

ORDOVICIAN - LOWER DEVONIAN

OSD

ROAD RIVER GROUP: Siltstone, dolomitic siltstone, slate; lesser limestone, graptolitic shale; minor volcanics, chert. Includes thin sections of Kechika Group locally. (Ancestral North America)

UPPER CAMBRIAN - LOWER ORDOVICIAN

COK

KECHIKA GROUP: Limestone, shale, calcareous phyllite, slate, graptolitic shale, rare tuffaceous layers. (Ancestral North America)

LOWER - UPPER CAMBRIAN

C

Generally unnamed, but includes rocks equivalent to Lower Cambrian Gog Group. Intervals of sandstone, siltstone, slate, quartzite, boulder conglomerate (Middle Cambrian), massive grey limestone (Middle and Upper Cambrian). Archeocyathid-bearing limestone in Gog-equivalent, lower part. Includes sections of Kechika Group and Hyland Group locally. (Ancestral North America)

LOWER CAMBRIAN

lCA

ATAN GROUP: Quartzite, sandstone, phyllite, overlain by archeocyathid-bearing limestone. May include Upper Proterozoic Ingenika Group locally. (Cassiar terrane)

lCG

GOG GROUP: Orthoquartzite and feldspathic quartzite, sandstone, slate, with lenses of archeocyathid-bearing limestone. May include Upper Proterozoic Hyland Group locally. (Ancestral North America)

PROTEROZOIC

UPPER PROTEROZOIC - LOWER CAMBRIAN

BCHG

Undifferentiated Hyland and Gog groups. (Ancestral North America)

UPPER PROTEROZOIC

uBI

INGENIKA GROUP: Swannell Formation: interbedded quartz-feldspar grit, sandstone, siltstone, phyllite, slate. Tsaydiz Formation: calcareous phyllite, limestone, phyllite. Espee Formation: limestone. Stelkuz Formation: sandstone, phyllite. (Cassiar terrane)

uBH

HYLAND GROUP: Phyllite, slate, siltstone, sandstone. (Ancestral North America)

INTRUSIVE ROCKS

MESOZOIC

MID-CRETACEOUS

mKqC

CASSIAR BATHOLITH: Quartz monzonite, granodiorite. Called Thudaka Batholith southeast of Thudaka Fault. (Cassiar terrane)

MIDDLE JURASSIC

MJdgT

THREE SISTERS PLUTONIC SUITE: Hornblende-biotite diorite, quartz monzodiorite, granodiorite. (Stikinia terrane)

EARLY JURASSIC

EJgP

PITMAN BATHOLITH: Quartz diorite and granodiorite, generally foliated. (Quesnellia terrane)

 

Geological map adapted from:

Gabrielse, H., 1962: Kechika, British Columbia, Geological Survey of Canada Map 42-1962, 1:253 440.

Wheeler, J.O. and McFeely, P. (compilers), 1991: Tectonic Assemblage Map of the Canadian Cordillera and adjacent parts of the United States of America, Geological Survey of Canada Map 1712A, 1:2 000 000.

Ferri, F., Nelson, J. and Rees, C., 1995: Preliminary Geology of the Gataga River area, British Columbia, B.C. Ministry of Energy, Mines and Petroleum Resources, Open File 1995-4, 1:50 000.

See KECHIKA (094L) Summary Sheet for an overview of the map area and additional regional references.

Positions of all geological contacts are approximate. In the case of an apparent disagreement between an occurrence’s geological location on the map and its stratigraphic setting given in the MINFILE documentation, the latter should be given priority.