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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 Deadwood Formation ： ウィキペディア英語版 Deadwood Formation The Deadwood Formation is a geologic formation of the Williston Basin and Western Canada Sedimentary Basin. It is present in parts of North and South Dakota and Montana in the United States, and in parts of Alberta, Saskatchewan, and southwestern corner of Manitoba in Canada. It is of Late Cambrian to Early Ordovician age and was named for exposures in Whitewood Creek near Deadwood, South Dakota.〔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.〕 It is a significant aquifer in some areas, and its conglomerates yielded significant quantities of gold in the Black Hills of South Dakota. It preserves trace fossils such as ''Skolithos'', and remains of Late Cambrian trilobites and brachiopods,〔J. Foster, 2014. Cambrian ocean world: Ancient sea life of North America. Indiana University Press, 432 p., ISBN 0253011884, 9780253011886〕 as well as Ordovician fossils. ==Stratigraphic position== At the type locality in the Black Hills of South Dakota and in many other areas, the Deadwood Formation rests unconformably on Precambrian metamorphic rocks that were exposed to a long period of erosion prior to the deposition of the formation. In western Montana, western Saskatchewan and Alberta it overlies the Middle Cambrian rocks of the Earlie Formation or the Pika Formation.〔 In the Williston Basin it is overlain by the Winnipeg Formation in the center and by the Red River Formation near the margins. In the central and southern Black Hills it is overlain by the Mississippian Englewood Formation. In Alberta and Saskatchewan it is overlain by the Devonian Elk Point Group.〔 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「Deadwood 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.