Tetcho Formation

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

Tetcho Formation
Stratigraphic range: Famennian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Kotcho Formation
Overlies	Trout River Formation Fort Simpson Formation
Thickness	up to 75 metres (250 ft)[1]
Lithology
Primary	Limestone
Other	Shale
Location
Coordinates	60.15500°N 121.30444°W / 60.15500; -121.30444 (Tetcho Formation)
Region	British Columbia Northwest Territories
Country	Canada
Type section
Named for	Tetcho Lake
Named by	H.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.