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End-Botomian mass extinction : ウィキペディア英語版 | End-Botomian mass extinction
The Botomian age of the Early Cambrian epoch lasted from ''ca'' 524 to ''ca'' 517 million years ago. At the end of the Botomian age there was a mass extinction that wiped out a high percentage of the organisms for which fossils were found. Organisms which produced small shelly fossils were almost exterminated. ==Notes==
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「End-Botomian mass extinction」の詳細全文を読む
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