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Stonewall Formation : ウィキペディア英語版 | Stonewall Formation
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.〔Kindle, E.M., 1914. The Silurian and Devonian Section of Western Manitoba; Geological Survey of Canada, Summary Report 1912, pp. 247-261.〕 ==Lithology== The Stonewall Formation is composed of finely crystallinedolomite, 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. 〔 〕 In the central Williston basin, the base is marked by an anhydrite bed.
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