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biochron A ''biochron'' (from the Greek ''bios'', life; and ''khronos'', time) is the length of time represented by a biostratigraphic zone. Biochrons are named after characteristic fossil organisms or taxa that characterise that interval in time. ==References==
*(North American Mammalian Time Scale ) Retrieved 20070618
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「biochron」の詳細全文を読む
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