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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 Ireviken event ： ウィキペディア英語版 Ireviken event The Ireviken event was a minor extinction event at the Llandovery/Wenlock boundary (mid Silurian, ). The event is best recorded at Ireviken, Gotland, where over 50% of trilobite species went extinct; 80% of the global conodont species also become extinct in this interval. ==Anatomy of the event== The event lasted around 200,000 years, spanning the base of the Wenlock epoch.〔 It comprises eight extinction "datum points"—the first four being regularly spaced, every 30,797 years, and linked to the Milankovic obliquity cycle.〔 The fifth and sixth probably reflect maxima in the precessional cycles, with periods of around 16.5 and 19 ka.〔 The final two data are much further spaced, so harder to link with Milankovic changes.〔 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「Ireviken event」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.