from 40 million to 25 million years ago; appearance of sabertoothed cats
造句
用作名詞(n.)
Beibu Wan Basin was a lake in the middle Eocence-Lower Oligocene. 北部灣盆地在中始新世至早漸新世是一個湖泊。
Venezuela, oil is produced from lenticular sandstone beds of the Oligocene oficina Formation. 委內瑞拉奧斯特拉油田的產油層，為漸新世奧菲西那組透鏡狀砂巖層。
The continental deposits of Enping formation aged from Oligocene to Eocene of Palaeocene are well-developed and widespreaded in the Pearl River Mouth Basin. 珠江口盆地下第三系始新統至漸新統恩平組分布廣泛。
用作形容詞(adj.)
Beibu Wan Basin was a lake in the middle Eocence-Lower Oligocene. 北部灣盆地在中始新世至早漸新世是一個湖泊。
Venezuela, oil is produced from lenticular sandstone beds of the Oligocene oficina Formation. 委內瑞拉奧斯特拉油田的產油層，為漸新世奧菲西那組透鏡狀砂巖層。