Saskatchewan Group

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Saskatchewan Group
Stratigraphic range: Frasnian
Type Geological formation
Sub-units Birdbear Formation
Duperow Formation
Underlies Three Forks Group
Overlies Manitoba Group
Thickness up to 350 metres (1,150 ft)[1]
Primary Carbonate
Other Evaporite
Coordinates 50°21′18″N 106°54′07″W / 50.355°N 106.902°W / 50.355; -106.902 (Saskatchewan Group)Coordinates: 50°21′18″N 106°54′07″W / 50.355°N 106.902°W / 50.355; -106.902 (Saskatchewan Group)
Region WCSB
Williston Basin
Country  Canada
 United States
Type section
Named for Saskatchewan
Named by A.D Baillie, 1953

The Saskatchewan Group is a stratigraphical unit of Frasnian age in the Western Canadian Sedimentary Basin.

It takes the name from the province of Saskatchewan, and was first described in the Mobil Oil Woodley Sinclair Cantuar X-2-21 well by A.D Baillie in 1953.[2]


The Saskatchewan Group is composed of carbonates with thin evaporites. [1]


The Saskatchewan Group reaches a maximum thickness of 350 metres (1,150 ft).[1] It is present in the sub-surface throughout the Williston Basin.


The Saskatchewan Group contains the following formations, from top to base:

Sub-unit Age Lithology Max.
Birdbear Formation Frasnian Upper: dolomite with evaporite interbeds
Lower: non-argillaceous limestone and dolomite
45 m (150 ft) [3]
Duperow Formation Frasnian limestone and dolomite, anhydrite, halite; up to 27 depositional cycles 300 m (980 ft) [4]

Relationship to other units[edit]

The Saskatchewan Group is conformably overlain by the Three Forks Group and conformably overlays the Manitoba Group carbonates.[1]

It is equivalent to the upper Beaverhill Lake Formation, the Woodbend Group and the lower part of the Winterburn Group in central Alberta, and with the Jefferson Group in Montana and North Dakota.


  1. ^ a b c d Lexicon of Canadian Geologic Units. "Saskatchewan Group". Retrieved 2010-01-01. 
  2. ^ Baillie, A.D., 1953. "Devonian names and correlations of the Williston Basin area; American Association of Petroleum Geologists Bulletin, vol. 37, no. 2 (February), pp. 444-447.
  3. ^ Lexicon of Canadian Geologic Units. "Birdbear Formation". Retrieved 2010-01-09. 
  4. ^ Lexicon of Canadian Geologic Units. "Duperow Formation". Retrieved 2010-01-09.