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The Shaunavon Formation is a stratigraphical unit of Bathonian age in the Western Canadian Sedimentary Basin. It takes the name from the town of Shaunavon, and was first described in the ''Tidewater A.O. Eastend Crown No. 1'' well, drilled south-west of the settlement, by R.L. Milner and G.E. Thomas in 1954.〔Milner, R.L. and Thomas, G E., 1954. Jurassic System in Saskatchewan. In: Western Canada Sedimentary Basin American Association of Petroleum Geologists, p. 250-267〕 ==Lithology== The Shaunavon Formation is composed of two members. The lower member consists of buff microcrystalline massive limestone in the lower part with an oolitic bed at the top. The upper member consists of calcareous sandstone and oolitic limestone, shell coquina and argillaceous limestone with interbeds of gray and green shale. 〔 〕 Dolomitisation can occur in both members. Lenticular beds separated by sedimentation breaks are common in the upper member. Channels also occur in the upper Shaunavon. 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「Shaunavon Formation」の詳細全文を読む スポンサード リンク
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