eocene epoch

基本解释

Few or any anthropoids are known to have existed in Africa during this period, known as the Eocene epoch.
人们原先不知道在这个被称为“始新世”的时期，非洲有类人猿的存在。
The microorganisms had lain dormant since the Eocene epoch, a time when Australia split off from Antarctica and modern mammals first appeared.
自始新世（5300-3650万年前）开始，它们便沉睡在化石之中，在那个时代，澳洲板块刚刚与南极板块分离，而现代哺乳动物刚刚开始出现。
It indicated that during the midterm Eocene epoch or before the wild buffalo, david deer and Chinese alligator originated from the middle lower reaches of Yellow River.
本文利用考古、文献以及实地调查等资料，论述了全新世中期及其以前，野生水牛、四不像鹿和中国鼍都以黄河中下游地区为起源和栖息地。

Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.
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