Unit Name: Tetcho Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Famennian (374.5 - 359.2 ma)
Age Justification: Brachiopods (Athyris sp., Basilicorhynus basilicum (Crickmay), Cyrtiopsis sp., Productella).
Province/Territory: British Columbia; Northwest Territories
Originator: Belyea and McLaren, 1962.
Type Locality:
1,269.5-1,345.7 m (4,165-4,415 ft), Imperial Island River No. 1, 60 deg 09' 18"N, 121 deg 18'16"W, N.W.T.
Distribution:
About 75 m (246 ft) thick. Occurs in northeastern British Columbia, north of 57 deg N, west to about 123 deg W and adjacent N.W.T. to 61 deg N between 119 deg and 123 deg W.
Locality Data:
WELL 300G506010121000; ISLAND RIVER NO. 1 (G-50). Interval(m): From 1269.5, To 1345.7.
Lithology:
Light coloured, fine-grained limestone, shale partings, becomes silty towards the base.
Relationship:
Conformable contacts with overlying Kotcho Fm and underlying Trout River and Fort Simpson formations. To the east it equates with the lower part of the Wabamun Gp; west of about 123 deg the shale equivalent is part of the Besa River Fm.
Other Citations:
Belyea and McLaren, 1962; Griffin, 1967; Torrie, 1973.
References:
Belyea, H.R. and McLaren, D.J., 1962. Upper Devonian formations, southern part of Northwest Territories, northeastern British Columbia and northwestern Alberta; Geological Survey of Canada, Paper 61-29, 74 p.
Source: CSPG Lexicon of Canadian Stratigraphy, Volume 2, Yukon Territory and District of Mackenzie; L.V. Hills, E.V. Sangster and L.B. Suneby (editor)
Contributor: G.K. Williams; D.W. Morrow
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 12 Mar 2009