Type Geological formation Country Canada
United States Primary Slate Overlies Red River Formation | Other Anhydrite, limestone Named by D.B. Dowling, 1900 Named for Stony Mountain, Manitoba Underlies Stonewall Formation | |
Thickness up to 45 metres (150 ft) Regions Western Canadian Sedimentary Basin, Williston Basin | ||
The Stony Mountain Formation is a stratigraphical unit of Ashgill age in the Western Canadian Sedimentary Basin.
Contents
It takes the name from the community Stony Mountain, Manitoba, and was first described in the town quarry by D.B. Dowling in 1900.
SubdivisionsEdit
The Stony Mountain Formation is divided in the following sub-units:
DistributionEdit
The Stony Mountain Formation occurs throughout the Williston Basin. It reaches a maximum thickness of 45 metres (150 ft) 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 30 metres (100 ft).
Relationship to other unitsEdit
The Stony Mountain Formation is slightly unconformably overlain by the Stonewall Formation and sharply overlays the Red River Formation or the Herald Formation.