Tetcho Formation

The Tetcho Formation is a stratigraphical unit of Famennian age in the Western Canadian Sedimentary Basin.

Tetcho Formation
Stratigraphic range: Famennian
TypeGeological formation
UnderliesKotcho Formation
OverliesTrout River Formation
Fort Simpson Formation
Thicknessup to 75 metres (250 ft)[1]
Lithology
PrimaryLimestone
OtherShale
Location
Coordinates60.15500°N 121.30444°W / 60.15500; -121.30444 (Tetcho Formation)
Region British Columbia
 Northwest Territories
Country Canada
Type section
Named forTetcho Lake
Named byH.R. Belyea, D.J. McLaren, 1962

It takes the name from Tetcho Lake, and was first described in the Imperial Island River No. 1 well (located south of Trout Lake by H.R. Belyea and D.J. McLaren in 1962.[2]

Lithology

The Tetcho Formation is composed of fine grained limestone with shale partings, silty at the base. [1]

Distribution

The Tetcho Formation reaches a maximum thickness of 75 metres (250 ft).[1] it occurs in the sub-surface in north-eastern British Columbia and southern Northwest Territories.

Relationship to other units

The Tetcho Formation is conformably overlain by the Kotcho Formation and conformably overlays the Trout River Formation and Fort Simpson Formation.[1]

It is equivalent to the lower Wabamun Group in Alberta and to parts of the Besa River Formation in the Liard area of British Columbia.

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References
  1. Lexicon of Canadian Geologic Units. "Tetcho Formation". Retrieved 2009-03-01.
  2. 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.
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