from 58 million to 40 million years ago; presence of modern mammals
双语例句
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。
