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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 Dresbachian ： ウィキペディア英語版 Dresbachian The Dresbachian is a Maentwrogian regional stage of North America, lasting from 501 to 497 million years ago.〔https://engineering.purdue.edu/Stratigraphy/resources/geowhen/stages/Maentwrogian.html〕 It is part of the Upper Cambrian and is defined by four trilobite zones. It overlaps with the ICS-stages Guzhangian, Paibian and the lowest Jiangshanian. The Dresbachian overlies the Middle Cambrian Albertan series, and is the lowest stage of the Upper Cambrian Croixian series, followed by the Franconian stage. The Dresbachian extinction event, about 502 million years ago, was followed by the Cambro-Ordovician extinction event about million years ago. ==Naming== The term is derived from the town of Dresbach which is located in southeastern Minnesota on the Mississippi River. 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「Dresbachian」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.