英语语法分析

The samples are from Oligocene, Miocene and Pliocene strata.

样品的地层年代介于渐新世和上新世之间。

Miocene formations (better: strata) are well-exposed in this area.

本区具有出露良好的中新世地层。

Okinawa ocean trough and Ryukyu island arc were formed in late Miocene.

中新世晚期，冲绳海槽和疏球岛弧形成。