Ravenscrag Formation

Ravenscrag Formation Stratigraphic range: Late Cretaceous to Tertiary PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Sub-units	Upper Ravenscrag Lower Ravenscrag
Underlies	Swift Current Formation erosional surface
Overlies	Frenchman Formation Battle Formation Whitemud Formation Eastend Formation Bearpaw Formation
Thickness	up to 244 metres (800 ft)^[1]
Lithology
Primary	Claystone
Other	Sandstone, coal
Location
Coordinates	49°30′07″N 108°58′33″W / 49.50182°N 108.97585°W / 49.50182; -108.97585 (Ravenscrag Formation)Coordinates: 49°30′07″N 108°58′33″W / 49.50182°N 108.97585°W / 49.50182; -108.97585 (Ravenscrag Formation)
Region	WCSB
Country	Canada
Type section
Named for	Ravenscrag, Saskatchewan
Named by	N.B. Davis, 1918

The Ravenscrag Formation is a stratigraphical unit of Late Cretaceous to Tertiary age in the Western Canadian Sedimentary Basin.

It takes the name from the settlement of Ravenscrag, Saskatchewan, and was first described in outcrop at Ravenscrag Butte near Frenchman River by N.B. Davis in 1918.^[2]

Lithology

The Ravenscrag Formation is composed of arenaceous claystone, with sandstone and coal interbeds. ^[1]

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Distribution

Ravenscrag Formation forms the relief in Cypress Hills

The Ravenscrag Formation reaches a maximum thickness of 244 metres (800 ft) and is present as the erosional surface in south-western Saskatchewan and in the Cypress Hills area.^[1]

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Relationship to other units

The Ravenscrag Formation is conformably overlain by the Swift Current Formation where not eroded and conformably overlays the Frenchman Formation or separated by an erosional surface from the underlying Battle Formation, Whitemud Formation, Eastend Formation or Bearpaw Formation.^[1]

It is equivalent to the Lance Formation in Montana, the Brazeau Formation of the foothills of Alberta and the Paskapoo Formation in southern Alberta.

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References

^ ^a ^b ^c ^d Lexicon of Canadian Geologic Units. "Ravenscrag Formation". Retrieved 2010-01-01.
^ Davis, N.B., 1918. Report on the clay resources of southern Saskatchewan; Canada, Department of Mines, Mines Branch, Report 468, 93 p.

v t e 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

Southern Alberta Plains	Cypress Hills FM Porcupine Hills FM Ravenscrag FM Edmonton GRP Belly River GRP Oldman FM Foremost FM Pakowki FM Milk River FM Colorado GRP Mannville GRP Ellis GRP Swift FM Rierdon FM Sawtooth FM Rundle GRP Banff FM Exshaw FM Bakken FM Wabamun FM Crowfoot FM Nisku FM Ireton FM Leduc FM Cooking Lake FM Beaverhill Lake GRP Elk Point GRP Canadian Shield

Saskatchewan	Cypress Hills FM Ravenscrag FM Frenchman FM Whitemud FM Eastend FM Bearpaw FM Judith River GRP Belly River FM Oldman FM Foremost FM Lea Park FM Pakowki FM Milk River FM Colorado GRP Viking FM Mannville GRP Pense FM Cantuar FM Success FM Vanguard FM Ellis GRP Swift FM Rierdon FM Sawtooth FM Shaunavon FM Piper FM Gravelbourg FM Gypsum Springs FM Watrous FM Big Snowy GRP Madison GRP Charles FM Poplar Ratcliffe Midale Mission Canyon FM Kisbey SS Alida Tilston Lodgepole FM Souris Valley Three Forks GRP Bakken FM Big Valley FM Torquay FM Saskatchewan GRP Birdbear FM Duperow FM Manitoba GRP Souris River FM Elk Point GRP Davson Bay FM Prairie FM Winnipegosis FM Ashern FM Interlake FM Stonewall FM Stony Mountain FM Herald FM Yeoman FM Winnipeg FM Deadwood FM Canadian Shield

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Last modified on 30 January 2010, at 16:35