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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 Dawson Arkose ： ウィキペディア英語版 Dawson Arkose The Dawson Arkose is a geologic formation in the Denver Basin that underlies the Denver area in Colorado. It is characterized by alternating beds of arkosic sandstone and mudstone.〔Raynolds, R.G. 2002. Upper Cretaceous and Tertiary stratigraphy of the Denver Basin, Colorado. Rocky Mountain Geology, vol. 37, no. 2, p. 111-134.〕 The Dawson Arkose contains plant remains〔Johnson, K.R., Reynolds, M.L., Werth, K.W., and Thomasson, J.R. 2003. Overview of the Late Cretaceous, early Paleocene, and early Eocene megafloras of the Denver Basin, Colorado. Rocky Mountain Geology, vol. 38, no. 1, p. 101-120.〕 and other nonmarine fossils, and hosts aquifers that are important sources of water for the area.〔Raynolds, R.G. and Johnson, K.R. 2003. Synopsis of the stratigraphy and paleontology of the uppermost Cretaceous and lower Tertiary strata in the Denver Basin, Colorado. Rocky Mountain Geology, vol. 38, no. 1, p. 171-181.〕 ==Stratigraphy== The Dawson Arkose consists of alluvial fan and fluvial deposits that accumulated at the foot of the growing Rocky Mountain Front ranges. It overlies and interfingers with the Denver Formation which spans the Cretaceous-Paleogene boundary, and is of early Paleocene (Puercan) age.〔Barclay, R.S., Johnson, K.R., Betterton, W.J., and Dilcher, D.L., 2003. Stratigraphy and megaflora of a K-T boundary section in the eastern Denver Basin, Colorado. Rocky Mountain Geology vol. 38, no. 1, p. 45-71.〕 In 2002 the Dawson Arkose was included as part of a larger unconformity-bounded unit named the D1 Sequence, in order to facilitate basin-wide studies and avoid confusion arising from the lateral and vertical facies changes that occur within the Denver Basin. The base of the D1 is marked by the abrupt facies change at the top of the Laramie Formation, and its top is placed at the base of a regional paleosol series. The Arapahoe Formation and the Denver Formation are also included in the D1 Sequence.〔 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「Dawson Arkose」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.