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The Besa River Formation is a stratigraphical unit of Devonian age in the Western Canadian Sedimentary Basin. It takes the name from Besa River, a tributary of the Prophet River, and was first described in outcrop near the Muskwa River, in the Muskwa Ranges by F.A. Kidd in 1963.〔Kidd, F.A., 1963. The Besa River Formation: Bulletin of Canadian Petroleum Geology, vol. 11, no. 4, pp. 369-372.〕 ==Lithology== The Besa River Formation is composed primarily of dark shale. Sandstone, bedded chert or limestone beds can occur at the top of the formation. The shale is slightly calcareous or siliceous and contains sponge spicules and radiolarians. 〔 〕 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「Besa River Formation」の詳細全文を読む スポンサード リンク
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