oligocene miocene boundary 渐新统中新统
Oligocene-Miocene boundary 渐新统
late oligocene-middle miocene 晚渐新世中中新世
oligocene to earliest miocene 渐新世至早中新世
It peaked in the Oligocene Epoch around 34 million years ago in Eurasia, and again in the Miocene Epoch about 10 million years ago in Eurasia and Africa.
而在大约3千4百万年前的渐新世的欧亚大陆上达到顶峰，在大约1千万年前中新世的欧亚大陆和非洲大陆又再次达到顶峰。
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。
The middle Jurassic Yeba formation volcanics, Paleocene biotite granite porphyry, Miocene quartz monzonite and Oligocene granite porphyry could be found in the ore field.
矿区出露中朱罗统叶巴组火山次火山沉积岩、古新世黑云母花岗斑岩、中新世二长石英斑岩以及渐新世花岗斑岩。
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