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Stony Mountain Formation

The Stony Mountain Formation is a stratigraphic unit of Ashgill age in the Western Canadian Sedimentary Basin.

Lithology
Subdivisions The Stony Mountain Formation is divided in the following sub-units: ;South (Williston Basin) • Penitentiary Member: argillaceous dolomiteGunn Member: interbedded calcareous shale and fossiliferous limestone ;North • Gunton Member: crystalline dolomite • Lower Stony Mountain: argillaceous dolomite ==Distribution==
Distribution
The Stony Mountain Formation occurs throughout the Williston Basin. It reaches a maximum thickness of in the sub-surface at the Canada/United States border, and thins out towards the east, north and west. In Manitoba, where it is exposed at the surface in the erosion belt, it has a thickness of . ==Relationship to other units==
Relationship to other units
The Stony Mountain Formation is slightly unconformably overlain by the Stonewall Formation and sharply overlays the Red River Formation or the Herald Formation. ==References==
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