Kotcho Formation

Kotcho Formation Stratigraphic range: Middle Famennian PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Underlies	Exshaw Formation
Overlies	Tetcho Formation
Thickness	up to 210.9 metres (690 ft)^[1]
Lithology
Primary	Shale
Other	Limestone
Location
Coordinates	60°09′18″N 121°18′16″W / 60.15500°N 121.30444°W / 60.15500; -121.30444 (Kotcho Formation)Coordinates: 60°09′18″N 121°18′16″W / 60.15500°N 121.30444°W / 60.15500; -121.30444 (Kotcho Formation)
Region	British Columbia Northwest Territories
Country	Canada
Type section
Named for	Kotcho Lake
Named by	H.R. Belyea, D.J. McLaren, 1962

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

It takes the name from Kotcho Lake, and was first described in the Imperial Island River No. 1 by H.R. Belyea and D.J. McLaren in 1962.^[2]

Lithology

The Kotcho Formation is composed of green-grey shale, locally bituminous, with thin argillaceous limestone beds or lenses. ^[1]

Distribution

The Kotcho Formation reaches a maximum thickness of 210.9 metres (690 ft).^[1]It is up to 30 metres (100 ft) thick in the Fort Nelson area, and thins down southwards, disappearing completely on the northern flank of the Peace River Arch.

Relationship to other units

The Kotcho Formation is overlain by the Exshaw Formation and conformably overlays the Tetcho Formation.^[1]

To the east, it grades into the upper Wabamun Group carbonate, and to the south-west into the Palliser Formation. To the east it is replaced by the Besa River Formation shale.

References

1 2 3 4 Lexicon of Canadian Geologic Units. "Kotcho Formation". Retrieved 2009-03-01.
↑ Belyea, H.R. and McLaren, D.J., 1962. Upper Devonian formations, southern pan of Northwest Territories, northeastern British Columbia and northwestern Alberta. Geological Survey of Canada, Paper 61-29.

Western Canadian Sedimentary Basin

Hydrocarbon history	Oil sands and heavy oil Frontier exploration and development Natural gas liquids Natural gas

Depositional Regions	Southern Alberta Central Alberta Northwestern Alberta Plains South-central Canadian Rockies foothills North-east Plains North-central foothills Liard River Fort Nelson Northern Rocky Mountains Fort St. John Saskatchewan Western Manitoba

Liard River Area	Wapiti GRP Kotaneelee FM Dunvegan FM Ft. St. John GRP Sully FM SikanniFM Lepine FM Buckinghorse FM Scatter FM Garbutt FM Liard FM Toad FM Grayling FM Ishbel GRP Fantasque FM Kindle FM Mattson FM Golata FM Debolt FM Prophet FM Besa River FM Dunedin FM Stone FM Wokpash FM Muncho-McConnell FM Nonda FM Kechica FM Atan FM Canadian Shield

Fort Nelson Area	Wapiti GRP Kotaneelee FM Dunvegan FM Ft. St. John GRP Sully FM SikanniFM Buckinghorse FM Scatter FM Belloy FM Rundle GRP Debolt FM Shunda FM Pekisko FM Banff FM Exshaw FM Kotcho FM Tetcho FM Trout River FM Kakisa FM Redknife FM Jean Marie MBR Fort Simpson FM Horn River FM Muskwa FM Waterways FM Slave Point FM Watt Mountain FM Muskeg FM Sulphur Point FM Presqu'ile FM Pine Point FM Keg River FM Chinchaga FM Canadian Shield

This article is issued from Wikipedia - version of the Wednesday, February 03, 2010. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.