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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 Gauss-Matuyama reversal ： ウィキペディア英語版 Gauss-Matuyama reversal The Gauss-Matuyama Reversal was a geologic event approximately 2.58 million years ago when the Earth's magnetic field underwent reversal. This event, which separates the Piacenzian from the Gelasian and marks the start of the Quaternary,〔(Clague, John ''et al.'' (2006) "Open Letter by INQUA Executive Committee" ''Quaternary Perspective, the INQUA Newsletter'' International Union for Quaternary Research 16(1): )〕 is useful in dating sediments. ==Biological effects== The event is marked by the extinction of calcareous nannofossils ''Discoaster pentaradiatus'' and ''D. surculus'', among others. 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「Gauss-Matuyama reversal」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.