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Ministry of Energy Mines and Responsible for Core Review

103O & P Geological Legend

 

Nass River

SEDIMENTARY AND VOLCANIC ROCKS

QUATERNARY

RECENT

Qa

Alluvium, sand, gravel, till

PLEISTOCENE AND RECENT

Qvb

Basalt flows, cinder cones, plateau basalts, etc.
JURASSIC

MIDDLE AND UPPER JURASSIC

JBLs

BOWSER LAKE GROUP: Siltstone, greywacke, sandstone conglomerate, minor limestone

LOWER JURASSIC

LJHv

HAZELTON GROUP: Volcanic flows (previously mapped as augite diorite and hornblende granodiorite)
TRIASSIC AND JURASSIC

UPPER TRIASSIC TO MIDDLE JURASSIC

TJHS

HAZELTON AND STUHINI GROUPS: Undifferentiated; green, red, and purple volcanic breccia, con- glomerate and sandstone, greywacke, argillite, crystal and lithic tuffs, some siltstone, limestone, andesitic and basaltic pillow lava(includes metamorphic equivalents of mainly Lower Jurassic rocks)

UPPER TRIASSIC OR JURASSIC

TJAP

ANYOX PENDANT: Jurassic Hazelton Group sediments and volcanics or Upper Triassic Kunga Group sediments and Karmutsen Formation (Vancouver Group) volcanics

INTRUSIVE ROCKS

TERTIARY

OLIGOCENE AND YOUNGER (?)

Lamprophyre, basalt and andesite dykes

EOCENE

Portland Canal dyke swarm: granite, quartz monzonite, granodiorite equigranular to porphyritic (not shown)

EAA

Alice Arm Intrusions: quartz monzonite porphyry, quartz feldspar porphyry, quartz diorite stocks, plugs and dykes
TERTIARY AND OLDER

CPC

Coast Plutonic Complex: granitic rocks; quartz diorite, granodiorite, quartz monzonite, locally foliated and/or gneissic, some granitic migmatite complex, minor diorite and gabbro
JURASSIC AND CRETACEOUS

JKfp

Feldspar porphyry, augite porphyry, hornblende diorite

 

Geological map and legend from:

Carter, N.C. and Grove, E.W. (1972): Geological Compilation Map of the Stewart, Anyox, Alice Arm and Terrace Areas (B.C. Ministry of Mines Preliminary Map 8), 1:250,000.

Grove, E.W. (1986): Geology and Mineral Deposits of the Unuk River-Salmon River-Anyox Area (B.C. Ministry of Mines Bulletin 63), 1:100,000

Alldrick, D.J. (1990): Geology and Mineral Deposits of the Stewart Mining Camp, U.B.C. Ph.D. Thesis

See Nass River (103O, P) 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.