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Cypress Hills Formation : ウィキペディア英語版 | Cypress Hills Formation
The Cypress Hills Formation is a stratigraphical unit of Oligocene age in the Western Canadian Sedimentary Basin. It takes the name from the Cypress Hills, and was first described in outcrops on the slopes of the Cypress Hills by M.Y. Williams and W.S. Dyer in 1930.〔Williams, M.Y. and Dyer, W.S., 1930. Geology of southern Alberta and southwestern Saskatchewan; Geological Survey of Canada, Memoir 163.〕 Type localities are found at Anxiety Butte in south-western Saskatchewan, as well as hill slopes in south-eastern Alberta. ==Lithology== The Cypress Hills Formation is composed of loose quartzitic gravel and sand, occasionally conglomerate and marl. 〔 〕
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