Unit Name: Karmutsen Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Undefined
Usage: Currently in use
Age Interval: Carnian - Late Triassic (228.7 - 199.6 ma)
Province/Territory: British Columbia
Originator: Gunning, 1932
Type Locality:
Queen Charlotte Islands, British Columbia
Distribution:
The Karmutsen Formation is well exposed on Moresby Island and on adjacent islands, but is rare on Graham Island (Sutherland-Brown, 1968).
Lithology:
The Karmutsen Formation is comprised of basalt flows, flow breccias, pillow lavas, intercalated massive grey limestone, tuff and minor siltstone (Haggart, 2004).
History:
The formation was named by H.C. Gunning (1932). He applied it to well exposed volcanic rocks in the Karmutsen Range of Northern Vancouver Island (Sutherland-Brown, 1968).
Other Citations:
Haggart, 2002
References:
Gunning, H.C., 1932. Preliminary Report on the Nimpkish Lake Quadrangle, Vancouver Island, British Columbia; Geological Survey of Canada, Summary Report 1931, Part A, pp. 22-35.
Haggart, J.W., 2004. Geology, Queen Charlotte Islands, British Columbia; Geological Survey of Canada, Open File 4681, 1 Map, Scale: 1:250 000.
Sutherland-Brown, A., 1968. Geology of the Queen Charlotte Islands, British Columbia; British Columbia Department of Mines and Petroleum Resources, Bulletin No. 54, 226 p.
Source: LEXICON_BC
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 03 Feb 2009