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Grosmont Formation
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Grosmont Formation : ウィキペディア英語版
Grosmont Formation

The Grosmont Formation is a stratigraphical unit of Frasnian age in the Western Canadian Sedimentary Basin.
It takes the name from the hamlet of Grosmont, Alberta, and was first described in well Imperial Grosmont No. 1, in 13-17-67-23W4M, central Alberta by H.R. Belyea in 1952.〔Belyea, H R., 1952. Notes on the Devonian System or the north-central plains of Alberta. Geological Survey of Canada; Belyea, H R ,1956. Grosmont Formation in the Loon Lake area. Journal of the Alberta Society of Petroleum Geologists, v. 4〕
==Lithology==
The Formation is composed of limestone and dolomite with minor argillaceous dolomite, siltstone and shale.〔
Anhydrite and anhydritic dolomite occur in the upper part (Hondo Member) in the west and south. Porous and fractured dolomite is predominant in the eastern extent of the Formation.

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