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Red River Formation

The Red River Formation is a lithostratigraphical unit of Late Ordovician age in the Williston Basin.

Lithology
Subdivisions The Red River Formation is composed of the following subdivisions from top to base: • Fort Garry Member: crystalline and micritic dolomite with an argillaceous dolomite breccia in the middle • Selkirk Member: fossiliferous, dolomitic limestoneCat Head Member: cherty dolomite, becoming calcareous to the south • Dog Head Member: fossiliferous dolomitic limestone ==Distribution==
Distribution
The Red River Formation reaches a maximum thickness of in the center of the Williston Basin. It extends throughout the Manitoba outcrop belt, and can be correlated throughout the entire Williston Basin area. It is thick and thins out to less than 50m (164 ft) northwards. ==Relationship to other units==
Relationship to other units
The Red River Formation is slightly unconformably overlain by the Stony Mountain Formation and sharply overlays the Winnipeg Formation in Manitoba, the Deadwood Formation in western Saskatchewan and the Canadian Shield in northern Manitoba. The lower Red River Formation is equivalent to the Yeoman Formation, while the Fort Garry Member correlates with the Herald Formation. ==References==
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