from 58 million to 40 million years ago; presence of modern mammals
例句
用作名词 (n.)
And third, there is geological evidence for plant extinctions in the Eocene. 第三，我们已经收集到始新世时代植物灭绝的地质证据。
In the northwest Pacific domain, the folding age is from Late Jurassic to Middle Eocene, and in the Tethys domain it is between Middle and Late Eocene. 主要褶皱时代很晚，在南北太平洋大地构造域是晚侏罗世至中始新世，在特提斯大地构造域是中晚始新世之交。
用作形容词 (adj.)
And third, there is geological evidence for plant extinctions in the Eocene. 第三，我们已经收集到始新世时代植物灭绝的地质证据。
We studied a maxillary fragment of tarsier and revealed that tarsiers had already achieved gigantic orbits and bell-shaped palate by the time of middle Eocene. 对于眼镜猴上颌骨片断的研究表明，中始新世的眼镜猴已经具有了如同现生眼镜猴一样的钟形腭和明显增大的眼眶。
美
