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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 Dockum Group ： ウィキペディア英語版 Dockum Group The Dockum is a Late Triassic (approximately late Carnian through Rhaetian, or 223-200 Ma) geologic group found primarily on the Llano Estacado of western Texas and eastern New Mexico with minor exposures in southwestern Kansas, eastern Colorado, and Oklahoma panhandle. The Dockum reaches a maximum thickness of slightly over 650 m but is usually much thinner. The Dockum rests on an unconformity over the Anisian (242-234 Ma) aged Anton Chico Formation. The Dockum and Chinle Formation were deposited roughly at the same time and share many of the same vertebrates and plant fossils. They appear to have very similar paleoenviroments. The two units are approximately separated by the Rio Grande in central New Mexico. The Chinle and Dockum are thought by some to be two separate units, deposited in separate depositional basins. ==History of investigation== There is no designated type locality for this formation. The Dockum was named by Cummins for a good exposure in vicinity of town of Dockum in Dickens County, Texas, in 1890. Lucas included the Dockum Group within the Chinle when he raised the Chinle to group status. Most researchers still maintain the Chinle is a formation and separate from the Dockum Group. It should be pointed out that the Dockum was named before the Chinle, and if Lucas is correct, his "Chinle Group" should be named the Dockum Group due to stratigraphic nomenclature rules. 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「Dockum Group」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.