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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 Cambrian Stage 2 ： ウィキペディア英語版 Cambrian Stage 2 Stage 2 of the Cambrian is the unnamed upper stage of the Terreneuvian series. It lies on top of the Fortunian and below Stage 3 of the Cambrian. It is commonly referred to as the Tommotian, after the Cambrian stratigraphy of Siberia. Both the upper and lower boundary have not been clearly defined yet by the International Commission on Stratigraphy.〔(【引用サイトリンク】url=http://www.stratigraphy.org/GSSP/index.html )〕 Proposals for the lower boundary are the appearance of Small Shelly Fossils, an archaeocyathid species or the mollusc ''Watsonella crosbyi'' around million years ago.〔 The proposed upper boundary might be the first appearance of trilobites around million years ago.〔 Possible candidates for a GSSP include the first appearance of ''Watsonella crosbyi'' in the Zhujiaqing Formation in Yunnan, China or the Pestrotsvet Formation near the Aldan River on the Siberian Platform. ==References== 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「Cambrian Stage 2」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.