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The Cardium Formation is a stratigraphic unit of Late Cretaceous age in the Western Canada Sedimentary Basin. It takes the name from the fossilized Cockle (Cardiidae) shells that it contains, and it was first described along the Bow River banks by James Hector in 1895.〔as reported in Whiteaves, J.F. 1895, Some of the Cretaceous fossils collected during Captain Palliser's explorations in British North America in 1857-60. Proc. and Trans., Royal Society of Canada, 2nd Ser., vol. 1, pp. 110.〕 It is present throughout western Alberta and in northeastern British Columbia, and it is a major source of petroleum and natural gas.〔 ==Lithology== The Cardium Formation is composed primarily of beds of massive, fine-grained to conglomeratic sandstone, which are separated by thick layers of shale. The formation is subdivided into the following members from top to base: *Sturrock Member (sandstone) *Leyland Member (shale) *Cardinal Member (sandstone) *Kiska Member (shale) *Moosehound Member (shale) *Ram Member (sandstone) In central Alberta, the formation is divided into the Pembina River Member and Cardium Zone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cardium Formation」の詳細全文を読む スポンサード リンク
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