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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 5 ： ウィキペディア英語版 Cambrian Stage 5 Stage 5 of the Cambrian is the first stage of the 3rd series of the Cambrian (or Middle Cambrian). Its lower boundary has not been formally defined by the ICS yet. The most promising definition is the first appearance of either the trilobite species ''Oryctocephalus indicus'' or ''Ovatoryctocara granulata'' which is currently estimated to be around million years ago. The end of Cambrian Stage 5 and the beginning of the Drumian stage is marked by the first appearance of the trilobite ''Ptychagnostus atavus'' around million years ago.〔(【引用サイトリンク】url=https://engineering.purdue.edu/Stratigraphy/gssp/index.php?parentid=77 )〕 ==Naming== The International Commission on Stratigraphy has not officially named the 5th stage of the Cambrian. A likely candidate for the name is "Molodian", named after the river Molodo in Bulunsky District, Sakha Republic, Russia. 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 5」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.