| 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) |
| Lithology | |
| Primary | Limestone |
| Other | Shale |
| Location | |
| Coordinates | 60°09′18″N 121°18′16″W / 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 |
The Tetcho Formation is a stratigraphical unit of Famennian age in the Western Canadian Sedimentary Basin.
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.
Lithology
The Tetcho Formation is composed of fine grained limestone with shale partings, silty at the base.
Distribution
The Tetcho Formation reaches a maximum thickness of 75 metres (250 ft). 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.
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.
References
- ^ Lexicon of Canadian Geologic Units. "Tetcho Formation". Retrieved 2009-03-01.
- 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.
| Western Canada Sedimentary Basin | |
|---|---|
| Hydrocarbon history | |
| Depositional regions |
|
| Fort Nelson area |
|