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The Lea Park Formation is a stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin, Canada. It takes the name from the settlement of Lea Park, Alberta, located north-west of Lloydminster on the banks of the North Saskatchewan River. It was first defined in an outcrop on the river banks, located in section 15-11-54-3W4M by J.A. Allan in 1918.〔Allan, J.A., 1918. Sections along North Saskatchewan River and Red Deer and South Saskatchewan rivers; Geological Survey of Canada, Summary Report 1917, Part C, pp. 9-13.〕 The early campanian age was determined from its foraminifera and mollusks found in the formation. ==Lithology== The Lea Park Formation is composed of dark shale with minor siltstone. 〔 〕 Calcite veins and ironstone concretions, as well as bentonite beds are found throughout the formation. 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「Lea Park Formation」の詳細全文を読む スポンサード リンク
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