Nature
The Tetcho Formation is a Famennian geological unit in the Western Canadian Sedimentary Basin, found in the subsurface of northeastern British Columbia and southern Northwest Territories. Named for Tetcho Lake, it was first described in 1962 by H.R. Belyea and D.J. McLaren from the Imperial Island River No. 1 well south of Trout Lake. It consists chiefly of fine-grained limestone with shale partings, becoming more silty toward its base, and reaches about 75 metres in thickness. In the regional sequence it lies conformably above the Trout River and Fort Simpson formations and below the Kotcho Formation, and it is considered equivalent to the lower Wabamun Group in Alberta and parts of the Besa River Formation in the Liard area.
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Northwest Territories · Canada