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Stonewall Formation

Coordinates: 50°07′07″N 97°43′26″W / 50.1186°N 97.7239°W / 50.1186; -97.7239 (Stonewall Formation)
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Stonewall Formation
Stratigraphic range: Ashgill to Alexandrian
TypeGeological formation
UnderliesInterlake Group
OverliesStony Mountain Formation
Thicknessup to 34 metres (110 ft)[1]
Lithology
Primarydolomite
OtherSandstone, anhydrite
Location
Coordinates50°07′07″N 97°43′26″W / 50.1186°N 97.7239°W / 50.1186; -97.7239 (Stonewall Formation)
RegionWCSB
Williston Basin
Country Canada
Type section
Named forStonewall, Manitoba
Named byE.M. Kindle, 1914
Stonewall Formation within Williston Basin stratigraphy

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

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The Stonewall Formation is composed of finely crystalline dolomite, 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

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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

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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

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