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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 Wapiti Formation ： ウィキペディア英語版 Wapiti Formation The Wapiti Formation is a geological formation of the Western Canada Sedimentary Basin in northwestern Alberta, Canada. Its deposition spanned the time interval from Late Cretaceous (Campanian stage) to early Paleocene, and it includes sediments that were deposited before, during, and after the Cretaceous-Paleogene (K-Pg) extinction event. It was named by G.M. Dawson in 1881,〔 presumably for exposures along the lower part of the Wapiti River and downstream along the Smoky River in Alberta.〔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.〕 Dinosaur remains are among the fossils that have been recovered from the Cretaceous portion of the formation.〔Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.〕 The Wapiti Formation does not produce many fossils due to its limited surface exposure and accessibility, although two ''Pachyrhinosaurus'' bone beds have been productive.〔Ryan, M. J., and A. P. Russell, 2001, ''Dinosaurs of Alberta (exclusive of Aves),'' in: ''Mesozoic Vertebrate Life'', edited by Tanke, D. H., and K. Carpenter, Indiana University Press, pp. 279–297 ISBN 978-0253339072〕 ==Lithology== The Wapiti Formation consists of interbedded sandstones, siltstones, shales and mudstones, with thin conglomerates, coal seams and bentonite beds. The sandstones are typically thick, pale grey, crossbedded and bentonitic. The middle part contains less sandstones, more mudstones, and fewer and thinner coals. The upper part contains thicker lenticular sandstones and more coals.〔 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「Wapiti 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.