1856, "pertaining to the Tertiary period between the Eocene and the Miocene," coined in German (1854) by Heinrich Ernst von Beyrich, from oligo- "small, little, few" + -cene. So called because few modern fossils were found in Oligocene rocks.
双语例句
1. Oligocene erosion had truncated the sediments draped over the dome.
覆盖于穹丘上的沉积岩为渐新世侵蚀所截削.
来自辞典例句
2. Beibu Wan Basin was a lake in the middle Eocence - Lower Oligocene.
北部湾 盆地在中始新世至早渐新世是一个湖泊.
来自互联网
3. There are four hydrocarbon source rocks, Palaeocene, Eocene, Oligocene and Miocene.
西湖凹陷发育古新统 、 始新统 、 渐新统及中新统四大烃源岩系.
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4. Paleogene Oligocene Linhe formation ( E _ 3 J ) and Eocene Wulate formation ( E _ 2 wl ).
下第三系渐新统临河组 ( E_3l ),始新统乌拉特组 ( E_2wl ).
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5. The differences between Oligocene series in the east and west are demonstrated.
