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Ministry of Energy Mines and Responsible for Core Review

104J Geological Legend

 

OVERLAP ASSEMBLAGES

PLEISTOCENE AND RECENT

Qs

Glacial and glaciofluvial deposits, stream deposits, felsenmeer, talus, soil; Qsr, river channel sediments

PLEISTOCENE

PV

Olivine basalt

MIOCENE TO PLEISTOCENE

MPT

TUYA FORMATION: alkali olivine basalt, tuff, agglomerate, minor trachyte and rhyolite; PPv, may include areas of underlying Mesozoic and Paleozoic rocks; MPvab, feldspar-quartz porphyry dikes and basaltic dikes, age uncertain

EOCENE

ETC

TANZILLA CANYON FORMATION: basal breccia, conglomerate, shale, freshwater limestone, coal; Es, conglomerate, sandstone, shale

Ev

Rhyolite, chalcedonic rhyolite breccia, tuff; El, biotite-quartz latite porphyry, age uncertain; Eahp, augite hornblende porphyry

EARLY EOCENE

EM

MEEHAUS PLUTON: Biotite-augite granodiorite

CRETACEOUS (?) AND TERTIARY

UPPER CRETACEOUS (?) TO EOCENE

KES

SIFTON FORMATION: conglomerate, sandstone, shale

KTS

SLOKO GROUP: rhyolite, dacite and trachyte flows, dikes, breccia

CRETACEOUS

LOWER AND (?) UPPER CRETACEOUS

KTC

TANGO CREEK FORMATION OF SUSTUT GROUP: conglomerate, sandstone, siltstone, shale

LATE CRETACEOUS

LKSP

SNOW PEAK PLUTON: biotite-hornblende granite, fine to medium grained

EARLY CRETACEOUS

CASSIAR PLUTONIC SUITE (EKBR, EKg):

EKBR

BEADY RANGE PLUTON: biotite granite, medium to coarse grained

EKg

Biotite-hornblende granite, age uncertain

JURASSIC

MIDDLE TO LATE JURASSIC

JTL

TACHILTA LAKES PLUTON: biotite and biotite-hornblende granodiorite, monzodiorite

JGL

GRANITE LAKE PLUTON: biotite and biotite-hornblende granodiorite

MLJgd

Biotite and biotite-hornblende granodiorite

STIKINE TERRANE

JURASSIC

EARLY TO MIDDLE JURASSIC

MJTS

THREE SISTERS PLUTON: MJTSl, leucocratic clinopyroxene-hornblende granodiorite, quartz monzodiorite; MJTSp, potassic marginal phase: biotite-hornblende quartz monzonite, granite, syenite; MJTSc, central phase: biotite-hornblende quartz monzodiorite, quartz monzonite; MJTSm, mafic phase: biotite-hornblende quartz diorite, diorite, gabbro; MJTSf, fine grained phase: clinopyroxene-biotite-hornblende quartz diorite, diorite and quartz monzodiorite

JPC

PALLEN CREEK PLUTON and related plutons: biotite-hornblende quartz monzodiorite and quartz monzonite, minor granodiorite

JT

TANZILLA PLUTON: biotite-hornblende granodiorite

Jgd

Granodiorite; Jd, diorite; Js, syenite; age uncertain

LOWER JURASSIC

lJT

TAKWAHONI FORMATION (lJT, lJTs, lJTgw, lJTv, lJTst, lJTcg): lJT, undivided greywacke, shale, siltstone, conglomerate, tuff, sandy limestone, arkosic, calcareous sandstone, basal conglomerate; lJTsm, calcsilicate hornfels; Toarcian

lJTs

Conglomerate, shale, tuff; Toarcian

lJTgw

Greywacke, shale, minor conglomerate; mainly Pliensbachian; lJTgm, hornfelsed equivalents of lJTgw including abundant sills and dikes of quartz-feldspar porphyry and granodiorite

lJTv

Grey to green andesitic breccia and tuff; age uncertain, may be Bajocian

lJTst

Dark grey and black shale, siltstone, tuff, minor greywacke; Sinemurian

lJTcg

Coarse, polymictic conglomerate; Sinemurian; may be partly Toarcian

lJv

Maroon and green epiclastic sandstone, pyroclastic volcanic rocks, agglomerate, flows; age uncertain

EARLY JURASSIC

EJT

TAHLTAN PLUTON: zoned ultramafic body; pyroxenite, pyroxene syenite, syenite; rich in apatite and magnetite

TRIASSIC AND JURASSIC

TrJgd

Biotite-hornblende quartz diorite, granodiorite, quartz monzonite, diorite; TrJqm, quartz monzonite

TRIASSIC

UPPER TRIASSIC

uTrST

STUHINI GROUP, upper part: massive and pillowed porphyritic augite basalt and coarse-bladed feldspar porphyry, aphanitic basalt; local basal granitic-cobble conglomerate; uTrSTs, tuffaceous argillite, greywacke, minor meta-andesite and augite porphyry

LATE TRIASSIC

LTrCH

CAKE HILL PLUTON: hornblende quartz monzodiorite, granodiorite, weakly to moderately foliated monzodiorite (and metamorphosed equivalents); rare hornblende diorite

LTrLC

LATHAM CREEK PLUTON: hornblende quartz diorite, monzodiorite, strongly foliated

LTrCM

CARIBOO MEADOWS PLUTON: augite metagabbro, hornblendite

LTrK

KAKETSA PLUTON and related intrusions: biotite-hornblende diorite, hornblende diorite; minor biotite-clinopyroxene diorite

LTrMC

MANSFIELD CREEK PLUTON: diorite and gabbro, strongly kaolinized

LTrga

Augite metagabbro; LTrgam, augite-biotite-hornblende gabbro, monzodiorite and monzogabbro, age uncertain

LTrhb

Hornblendite

LTrgm

Undivided biotite-hornblende quartz diorite, granodiorite, quartz monzonite, diorite

MIDDLE TRIASSIC

STUHINI GROUP, lower part: (mTrST, lmTrST, lTrST)

mTrST

Augite porphyry, meta-andesite, metabasalt, volcanic breccia, may include uTrST

LOWER AND MIDDLE TRIASSIC

lmTrST

Argillite, siliceous argillite, greywacke, phyllite; minor chert and limestone; lTrST, includes augite porphyry breccia and tuff; may be entirely Lower Triassic

PERMIAN

Pc

Massive limestone; may locally include phyllite and ribbon chert; Pc, may be, in part, older

Pp

Phyllite, ribbon chert; Pp, may be, in part, older

Pv

Phyllitic greenstone, phyllite, minor chert and limestone, rusty weathering; Pv, may be, in part, older

METAMORPHIC ROCKS

Gn

Diorite gneiss, amphibolite, migmatite; age uncertain, terrane assignment uncertain

QUESNEL TERRANE

JURASSIC

LOWER JURASSIC

lJN

NAZCHA FORMATION: greywacke, conglomerate, shale, slate, siltstone; Sinemurian and (?) younger

TRIASSIC

LATE TRIASSIC

LTrgd

Hornblende granodiorite, hornblende diorite; commonly foliated; may be in part of Early Jurassic age; LTrKgd, includes irregular bodies of EKg and MJgd

UPPER TRIASSIC

uTrc

Limestone

uTrSH

SHONEKTAW FORMATION: augite porphyry, feldspar porphyry, tuff, agglomerate, pyroxenite; minor shale, siltstone and greywacke may include some LTrg; TrJSHN, undivided Shonektaw and Nazcha formations

CACHE CREEK TERRANE

JURASSIC

LOWER JURASSIC, may be in part, MIDDLE JURASSIC

JI

INKLIN FORMATION: penetratively cleaved, phyllitic slate, greywacke, pebble and cobble conglomerate; JId, diamictite, possibly Kutcho Formation in part

TRIASSIC

UPPER TRIASSIC

uTrS

SINWA FORMATION: limestone, commonly argillaceous and fetid

uTrK

KUTCHO FORMATION: basaltic to rhyolitic schist (flows, breccia, crystal tuff); fine grained volcanic sediments, basic schist, conglomerate (may be basal Inklin Formation, in part); TrJKI, undivided Kutcho, Inklin and possibly Cache Creek rocks

MISSISSIPPIAN TO TRIASSIC

CACHE CREEK COMPLEX (MTrK, PT, PFR, MPH, MPc, MPv, MPga, MPu)

MTrK

KEDAHDA FORMATION: chert, cherty argillite; minor argillite, siltstone and volcanic sandstone; minor volcanic rocks and metamorphosed equivalents; MTrKsv, sediments and volcanics, undivided; MTrKgw, greywacke, slate, chert; may be entirely of Late Triassic age ?

PERMIAN

PT

TESLIN FORMATION: massive limestone, minor mafic volcanics

PFR

FRENCH RANGE FORMATION: undivided; basalt, tuff, agglomerate; minor chert, argillite; PFRt, dominantly tuff and agglomerate; PFRv, dominantly mafic volcanic flows

UPPER MISSISSIPPIAN TO PERMIAN

MPH

HORSEFEED FORMATION: limestone, dolomitic limestone

MPc

Limestone, age unknown

MPv

Mafic volcanics, greenstone, age unknown

MPga

Coarse grained to pegmatitic gabbro, diorite; MPgv, fine grained, foliated gabbro, greenstone; may include small serpentinite bodies

MPu

Peridotite, dunite, pyroxenite, generally serpentinized; locally includes pods of nephrite jade and small bodies of listwanite, rodingite and talc

ANCESTRAL NORTH AMERICA

CAMBRIAN

LOWER CAMBRIAN

ATAN GROUP

EB

BOYA FORMATION: quartzitic sandstone, siltstone, slate, phyllite; EAm, micaceous quartzite, mica schist, minor crystalline limestone; may include some STELKUZ FORMATION; Emm, undivided pyritic, hornfelsic slate, argillite, siltstone, quartzite, micaceous quartzite, schist, limestone; variably metamorphosed; mainly Cambrian to Mississippian(?); Emmc, mainly carbonate; Emmgs, greenstone


Geological map and legend compiled from:

Gabrielse, H. (1994): Geology of Dease Lake (104J/E) and Cry Lake (104I) map areas, north-central British Columbia; Geological Survey of Canada, Open File 2779, Scale 1:50,000.

Gabrielse, H. et.al. (1980): Geology of Dease Lake (104J) map area, British Columbia; Geological Survey of Canada, Open File 707, Scale 1:125,000.

See DEASE LAKE (104J) 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.