Stonewall Formation

Stonewall Formation Stratigraphic range: Ashgill to Alexandrian PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Underlies	Interlake Group
Overlies	Stony Mountain Formation
Thickness	up to 34 metres (110 ft)^[1]
Lithology
Primary	Dolomite
Other	Sandstone, anhydrite
Location
Coordinates	50°07′07″N 97°43′26″W / 50.1186°N 97.7239°W / 50.1186; -97.7239 (Stonewall Formation)Coordinates: 50°07′07″N 97°43′26″W / 50.1186°N 97.7239°W / 50.1186; -97.7239 (Stonewall Formation)
Region	WCSB Williston Basin
Country	Canada
Type section
Named for	Stonewall, Manitoba
Named by	E.M. Kindle, 1914

The Stonewall Formation is a stratigraphical unit of Late Ordovician to Early Silurian age in the Western Canadian Sedimentary Basin.

It takes the name from Stonewall, Manitoba, and was first described in the Stonewall quarry by E.M. Kindle in 1914.^[2]

Lithology

The Stonewall Formation is composed of finely crystallinedolomite, with a basal argillaceous and sandy dolomite (the Williams Member). Two thin sandstone beds occur in the middle and at the top of the formation. ^[1] In the central Williston basin, the base is marked by an anhydrite bed.

Distribution

The Stonewall Formation occurs at surface in the Manitoba outcrop belt and in the sub-surface in the Williston Basin.^[1] It reaches a maximum thickness of 34 metres (110 ft).

Relationship to other units

The Stonewall Formation is overlain by the Interlake Group (conformably in the south, disconformably in the north) and sharply overlays the Stony Mountain Formation.^[1]

References

1 2 3 4 Lexicon of Canadian Geologic Units. "Stonewall Formation". Retrieved 2010-02-03.
↑ Kindle, E.M., 1914. The Silurian and Devonian Section of Western Manitoba; Geological Survey of Canada, Summary Report 1912, pp. 247-261.

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

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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