from 63 million to 58 million years ago; appearance of birds and earliest mammals
双语例句
1. Paleocene The oldest epoch of the Tertiary, 65 - 55 million yesrs ago.
古新世:第三纪最古的年代, 6500万～5500万年前.
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用作名词 (n.)
Paleontological studies showed that modern avian groups probably first appeared in the Paleocene and experienced an explosive radiation in the early Cenozoic. 古生物学研究表明，现生鸟类的最早出现是在古新世，而爆发性辐射演化发生在新生代早期。
