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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 Late Ordovician glaciation ： ウィキペディア英語版 Late Ordovician glaciation The Late Ordovician Glaciation is a period at the end of the Ordovician that started at the border between the Katian and Hirnantian about 440-460 Ma (million years ago). The major glaciation during this period is widely considered to be the leading cause of the Ordovician-Silurian extinction event. Evidence of this glaciation can be seen in places such as Morocco, Libya, and Wyoming. More evidence derived from isotopic data is that during the Late Ordovician, Tropical ocean temperatures were about 5 °C cooler than present day, this would have been a major factor that aided in the glaciation process. The Late Ordovician is the only glacial episode that appears to have coincided with a major mass extinction of nearly 61% of marine life. Estimates of peak ice sheet volume range from 50 to 250 million cubic kilometers, and its duration from 35 million to less than 1 million years. There were also two peaks of glaciation.〔 Also, glaciation of the Northern Hemisphere was minimal because a large amount of the land was in the southern hemisphere. ==Evidence== 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「Late Ordovician glaciation」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.