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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 Redwall Limestone ： ウィキペディア英語版 Redwall Limestone Redwall Limestone is a resistant cliff-forming unit that forms prominent, red-stained cliffs that range in height from to . Dating to the Mississippian age, it consists predominately of light-olive-gray to light-gray, thin-bedded, fine- to coarse-grained, thin- to thick-bedded, often cherty, limestone. Its lower part consists of brownish-gray, interbedded finely crystalline dolomite and fine- to coarse-grained limestone with layers of white chert lenses and yellowish-gray and brownish-gray, cliff-forming, thick-bedded, fine-grained dolomite. It is divided into Horseshoe Mesa Member, Mooney Falls Member, Thunder Springs Member, and Whitmore Wash Member.〔〔Chronic, H (1983) ''Roadside Geology of Arizona.'' The Mountaineers Books, Seattle, Washington. (softcover, ISBN 978-0-87842-147-3)〕 The upper and lower contacts of the Redwall Limestone are both unconformities. Its upper contact is a disconformity that characteristically is a nearly horizontal surface with little or no relief. (In the Grand Canyon, the upper disconformity forms a horizontal platform at the top of the Redwall Limestone.) Locally, the bottom unconformity of the Redwall Limestone contains a basal conglomerate that directly rests upon this bottom unconformity. This basal conglomerate is typically composed of gravel that is locally derived from either the underlying Temple Butte Limestone or Muav Limestone. The upper contact of the Redwall Limestone consists of a deeply eroded disconformity characterized by deeply incised paleovalleys and deep paleokarst depressions that are often filled by sediments of the Surprise Canyon Formation.〔〔Kenny, R (2010) (''Continental paleoclimate estimates from the late Mississippian Redwall karst event: northern and north-central Arizona (USA).'' ) Carbonates Evaporites. 25(4):297-302〕 ==See also== *Geology of the Grand Canyon area 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「Redwall Limestone」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.