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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 Series 2 ： ウィキペディア英語版 Cambrian Series 2 Cambrian Series 2 is the unnamed 2nd series of the Cambrian. It lies above the Terreneuvian series and below the Cambrian Series 3. Series 2 has not been formally defined by the International Commission on Stratigraphy, lacking a precise lower and upper boundary and subdivision into stages. The proposed lower boundary is the first appearance of trilobites which is estimated to be around million years ago.〔(【引用サイトリンク】url=https://engineering.purdue.edu/Stratigraphy/gssp/index.php?parentid=77 )〕 The upper boundary is proposed as the first appearance of either the trilobite species ''Oryctocephalus indicus'' or ''Ovatoryctocara granulata'', currently estimated to be around million years ago. ==Naming== The International Commission on Stratigraphy has not named the 2nd stage of the Cambrian yet.〔 The new name will replace the older terms "Lower Cambrian" and "Early Cambrian". The nomenclature used in Sibera uses the term "Yakutian" for this series. 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 Series 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.