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Belly River Group
The Belly River Formation is a stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin.
It takes the name from the Belly River, a tributary of the Oldman River in southern Alberta, and was first described in outcrop on the banks of the Oldman River (at the time considered part of the Belly River) and Bow River by George Mercer Dawson in 1883.〔Dawson, G.M., 1883. Preliminary report on the geology of the Bow and Belly river region, Northwest Territory, with special reference to the coal deposits. Geological Survey of Canada, Report of Progress for 1880-81-82, Part B.〕
==Lithology==
The Belly River Formation is composed of very fine grained sandstone with coarse grained beds and minor bentonite, coal, green shale and concretionary beds.
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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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