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Alberta Group : ウィキペディア英語版
Alberta Group

The Alberta Group is a stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.
It takes the name from the province of Alberta, and was first described in outcrops along the Highwood River in southern Alberta by G.S. Hume in 1930.〔Hume, G.S., 1930. The Highwood-Jumpingpound Anticline, with Notes on Turner Valley, New Black Diamond and Priddis Valley Structures, Alberta; Geological Survey of Canada, Summary Report 1929, Part B, pp. 1-24.〕
==Lithology==
The Alberta Group is composed of silty shale for the most part. Two thick shale deposits (Blackstone Formation and Wapiabi Formation) are present above and below a sandstone sequence (the Cardium Formation). Sideritic concretions and thin argillaceous limestone beds are present within the shale stacks.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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