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Medicine Hat Sandstone : ウィキペディア英語版
Colorado Group

The Colorado Group, also called the Colorado shale, is a stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.
It was first described in the Rocky Mountains front ranges of Colorado by A. Hague and S.E. Emmons in 1877.〔Hague, A. and Emmons, S.E., 1877. Descriptive geology. U.S. geological exploration of the fortieth parallel, v.2.〕
==Lithology==
The Colorado Group consists of shale for the most part, and incorporates conglomerate, sandstone and siltstone, and beds of chalk, chalky limestone, coquinas, phosphorite and concretionary beds including calcite, siderite and pyrite.
The lower part includes the following sandstone members: Phillips Sandstone (below the Second White Speckled Shale), Bowdoin Sandstone and Cardium Sandstone in the non-calcareous shale unit. The upper part includes the Martin Sandy Zone and Medicine Hat Sandstone.〔

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