古近纪
古近纪（英语：Paleogene，符号Pg），旧称早第三纪，是地质时代中个一个纪，从同位素年龄65.5±0.3百万年（Ma）开始，到23.03±0.05Ma结束。“古近纪”一名中个“古”是paleo-的意译，“近”则是-gene个音译，并兼顾了字面意义。
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