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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Boulder Creek Formation ： ウィキペディア英語版 Boulder Creek Formation The Boulder Creek Formation is a geologic formation in northeastern British Columbia. It was named for a tributary to Commotion Creek in the Pine Pass area by E.M. Spieker in 1921.〔 At one time considered to be a member of the Commotion Formation, it was elevated to formation status by D.F. Stott in 1982.〔Stott, D.F. 1982. Lower Cretaceous Fort St. John Group and Upper Cretaceous Dunvegan Formation in the foothills and plains of Alberta, British Columbia, District of Mackenzie and Yukon Territory. Geological Survey of Canada, Bulletin 328, 124 p.〕 The formation was deposited in shallow marine to shoreline environments during the Albian stage of the Early Cretaceous period. It preserves ammonites, plant remains, and other fossils.〔Glass, D.J. (editor) 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba. Canadian Society of Petroleum Geologists, Calgary, 1423 p. on CD-ROM. ISBN 0-920230-23-7.〕〔 ==Lithology and Environment of Deposition== The Boulder Creek Formation records the transition from marine conditions, represented by the shales of the underlying Hulcross Formation, to continental environments, with a return to marine conditions marked by the shales of the overlying Hasler Formation. Near shore and shoreface deposits consist of massive, fine grained, well sorted sandstones, and massive, silica-cemented conglomerates of quartz and chert pebbles in a matrix of coarse sand. Delta plain and floodplain deposits consist of interbedded argillaceous sandstones, carbonaceous shales and thin coal beds.〔〔Stott, D.F. 1963. Stratigraphy of the Lower Cretaceous Fort St. John Group and Gething and Cadomin Formations, foothills of Alberta and British Columbia. Geological Survey of Canada, Paper 62-39, 48 p.〕 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「Boulder Creek Formation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.