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Ministry of Energy Mines and Responsible for Core Review

GEOLOGICAL LEGEND

(092INE - KAMLOOPS LAKE)

 

Quaternary

      Pleistocene and Recent

Qal

Thick drift; alluvium, glaciofluvial and lacustrine deposits, till, colluvium

Tertiary

      Miocene and Pliocene

MPv

‘Plateau basalt’; basalt, olivine basalt, minor tuff

 

MPD

CHILCOTIN GROUP

Deadman River Formation: poorly consolidated tuff, breccia, diatomite, sandstone, conglomerate

      MIOCENE(?) and/or older

Mv

Olivine basalt near Brigade Lake

      EOCENE

EK

KAMLOOPS GROUP: mainly basalt and andesite; local rhyolite, breccia, tuff and sandstone, tuffaceous sediments (includes the Tranquille and Dewdrop Flats formations)

JURASSIC

      MIDDLE AND EARLY JURASSIC

JA

Ashcroft Formation: argillite, siltstone, sandstone, conglomerate and local, minor carbonate

TRIASSIC

      LATE TRIASSIC

         NICOLA GROUP (TrNc - TrNm)

TrNc

Central volcanic facies of Nicola Group; intermediate, plagioclase, augite plagioclase porphyry pyroclastics, local pillowed and plagioclase porphyry flows

TrNe

Eastern volcanic facies of Nicola Group; mafic, augite and hornblende porphyry bearing breccia and tuff, local intercalated argillite

TrNs

Sedimentary facies of Nicola Group; argillite, sandstone, tuff; local chert-carbonate-volcanic conglomerate

TrNm

Amphibolite, foliated diorite, mylonite and chlorite schist derived from Nicola Group

carboniferous to triassic

         nicola and/or harper ranch groups

DTrm

Meta-augite porphyry, chlorite schist (v); argillite, phyllite, volcanic sandstone, semischist; local carbonate of both Triassic and Carboniferous ages

DEVONIAN TO PERMIAN

         HARPER RANCH GROUP

DPH

Argillite, cherty argillite, siltstone, volcanic and chert grain sandstone; chert pebble conglomerate; volcaniclastics of mafic to felsic composition; minor carbonate

Pc,Cc

Carbonate; where age is known, indicated (e.g. Pc)

 

INTRUSIVE ROCKS

tertiary

      miocene(?) and/or older

Ti

Small intrusions of mainly intermediate composition

TRIASSIC AND/OR JURASSIC

TrJgd,qm

Granodiorite, quartz monzonite (Guichon Creek, Wild Horse batholiths)

TrJd,gb,s,u

Diorite, gabbro, syenite, granite and local ultramafic rock of Iron Mask Batholith and similar, probably related, alkaline intrusions

 

 

 

 

 

 

Geological map and legend compiled from:

 

Cockfield, W.E. (1948): Geology and Mineral Deposits of Nicola Map-Area, British Columbia; Geological Survey of Canada, Memoir 249, 164 pages.

Duffell, S. and McTaggart, K.C. (1952): Ashcroft Map Area, British Columbia; Geological Survey of Canada, Memoir 262, 122 pages.

Kwong, Y.T.J. (1987): Evolution of the Iron Mask Batholith and Its Associated Copper Mineralization; B.C. Ministry of Energy, Mines and Petroleum Resources, Bulletin 77, 55 pages.

McMillan, W.J. (1978): Geology of the Guichon Creek Batholith; B.C. Ministry of Energy, Mines and Petroleum Resources, Preliminary Map 30.

Monger, J.W.H. and McMillan, W.J. (1989): Geology, Ashcroft, British Columbia (92I); Geological Survey of Canada, Map 42-1989, sheet 1, scale 1:250 000.

Roddick, J.A., Muller, J.E. and Okulitch, A.V. (1979): Fraser River, B.C.-Washington 1:1,000,000 Geological Atlas, Sheet 92; Geological Survey of Canada, Map 1386A.

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