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The Horn River Formation (also ''Horn River Shale'') is a stratigraphic unit of Devonian (early Givetian to late Frasnian) age in the Western Canadian Sedimentary Basin. It is a thick sequence of marine sediments that was first described in outcrop on the banks of the Horn River, a tributary of the Mackenzie River, in the Northwest Territories (at the time District of Mackenzie) by Whittaker in 1922,〔Whittaker, E.J., 1922. Mackenzie River District between Great Slave Lake and Simpson. Geological Survey of Canada Summary Report 1921, Part B, p. 45-56.〕 and it takes its name from that river. In 1963 it was redefined in the subsurface of the Fort Nelson area of British Columbia (well Fort Nelson a-95-J/94-J-10) by F.F. Gray and J.R. Kassube.〔Gray, F.F. and Kassube, J R., 1963. Geology and stratigraphy of Clarke Lake gas field, northeastern British Columbia. American Association of Petroleum Geologists, v. 47, p. 467-483.〕 It is significant for its shale gas resources. ==Lithology== The Horn River Formation is composed of dark siliceous and calcareous shale, and argillaceous bitumenous limestone. 〔 〕 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「Horn River Formation」の詳細全文を読む スポンサード リンク
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