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Ministry of Energy Mines and Responsible for Core Review

092ISW Geological Legend

 

Lytton

STRATIFIED ROCKS

CENOZOIC
QUATERNARY
PLEISTOCENE AND RECENT
Qs Thick drift; glaciofluvial and lacustrine deposits, till, colluvium, landslide
PRV "Valley basalt"; vesicular olivine basalt; local felsic to intermediate breccia in Coast Mountains
TERTIARY
EOCENE
EK KAMLOOPS GROUP: Mainly basalt and andesite; local rhyolite, breccia, tuff and sandstone
EP PRINCETON GROUP: Volcanic flows, volcaniclastics, characterized by hornblende needles
ES Sandstone, conglomerate, argillite, coal
MESOZOIC
MIDDLE AND LATE CRETACEOUS
     SPENCES BRIDGE GROUP
KSB Intermediate, locally felsic and mafic flows and pyroclastics; sediments
KSBs SPIUS CREEK FORMATION (formerly Kingsvale Group): Mafic volcanics
Ks Chert-grain sandstone and conglomerate, minor shale; possibly correlative with part of PASAYTEN GROUP
LOWER AND MIDDLE CRETACEOUS

KJ

JACKASS MOUNTAIN GROUP: Sandstone, argillite, conglomerate
JURASSIC AND CRETACEOUS
     RELAY MOUNTAIN GROUP
JKr Argillite, siltstone, sandstone, local , conglomerate
JKm Phyllite, semischist, local conglomerate
MIDDLE AND LOWER JURASSIC

JL

LADNER GROUP: Metasediments; tuff
LATE TRIASSIC

TNw

NICOLA GROUP: Western volcanic facies; pyroclastics, argillite, sandstone, local carbonate

INTRUSIVE ROCKS

CENOZOIC
MIOCENE(?) AND/OR OLDER

Ti

Small intrusions of mainly intermediate composition
EOCENE

Egd

NICOLA BATHOLITH: Granodiorite, quartz monzonite
MESOZOIC
LATE CRETACEOUS

IKgd,qm

SCUZZY PLUTON: Granodiorite (gd), quartz monzonite (qm)
TRIASSIC AND/OR JURASSIC
    GUICHON CREEK BATHOLlTH
TJGb BORDER PHASE: Quartz diorite to granodiorite
TJGh HIGHLAND VALLEY PHASE: Granodiorites
TJGbm BETHLEHEM PHASE: Granodiorite with younger porphyry dykes and sills
LTJGba BETHSAIDA PHASE: Quartz monzonite to granodiorite with younger dykes and plugs

METAMORPHIC ROCKS

MESOZOIC
EOCENE

Ms

Garnet-biotite, kyanite and sillimanite schist, local amphibolite
TRIASSIC AND/OR JURASSIC
     MOUNT LYTTON COMPLEX
TJgd Granodiorite
TJd Diorite and amphibolite
TJm Layered quartzofeldspathic rock, amphibolite, mylonite
PALEOZOIC AND/OR MESOZOIC
PERMIAN TO JURASSIC
     BRIDGE RIVER COMPLEX

PJBR

Radiolarian chert, argillite; volcanics; gabbro; serpentinite

PJBRm1

Lower greenschist facies, phyllite, schist

PJBRm2

Upper greenschist-Iower amphibolite facies, schists, commonly containing concordant and cross-cutting Eocene felsic dykes and sills

PJBRu

Ultramafic rock, local gabbro
MIDDLE PENNSYLVANIAN TO LATE TRIASSIC

PTCe

CACHE CREEK COMPLEX: Eastern belt; melange, with radiolarian chert, and chert-argillite matrix, blocks of limestone, chert, basalt, local ultramafics, rare felsic volcanic

Geological legend and base derived from:

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

McMillan, W.J., Blanchflower, J.D., McAndless, P., Coombs, D., Garvin, P. (1978): Geology of the Guichon Creek Batholith and Highland Valley Porphyry Copper District, British Columbia; B.C. Ministry of Energy, Mines and Petroleum Resources, Preliminary Map 30, scale 1:100,000.

See  LYTTON (092ISW) 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.