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- Oligocene - Wikipedia
The Oligocene (IPA: ˈ ɒ l ɪ ɡ ə s iː n,-ɡ oʊ- OL-ə-gə-seen, -goh-) [4] is a geologic epoch of the Paleogene Period that extends from about 33 9 million to 23 million years before the present (33 9 ± 0 1 to 23 03 ± 0 05 Ma) As with other older geologic periods, the rock beds that define the epoch are well identified but the
- 渐新世 - 百度百科
渐新世（Oligocene）是地质时代中古近纪（Paleogene）的最后一个主要分期，大约开始于3400万年前，终于2300万年前，介于始新世（Eocene）与新近纪的中新世（Miocene）之间。
- Oligocene Epoch | Climate, Flora Fauna | Britannica
Oligocene Epoch, third and last major worldwide division of the Paleogene Period (65 5 million to 23 million years ago), spanning the interval between 33 9 million to 23 million years ago The Oligocene Epoch is subdivided into two ages and their corresponding rock stages: the Rupelian and the
- The Oligocene Epoch - University of California Museum of Paleontology
The Oligocene Epoch, right smack in the middle of the Tertiary Period (and end of the Paleogene), lasted from about 33 9 to 23 million years ago * Although it lasted a "short" 11 million years, a number of major changes occurred during this time
- Oligocene Epoch - Geology Page
The Oligocene is a geologic epoch of the Paleogene period and extends from about 33 9 million to 23 million years before the present (33 9±0 1 to 23 03±0 05 Ma) As with other older geologic periods, the rock beds that define the period are well identified but the exact dates of the start and end of the period are slightly uncertain
- Overview of the Oligocene Epoch - ThoughtCo
The Oligocene epoch marked the continuing transition between the wildlife of the Eocene and Miocene epochs Here's a look at prehistoric life during the Oligocene epoch
- 如何解释「渐新世」？ - 知乎
渐新世是新生代第一个纪的最后一个世，始于始新世末期的始新世-渐新世灭绝事件（Eocene–Oligocene extinction event）。 在这次事件中，大量欧洲物种灭绝，而大量亚洲物种迁入欧洲。
- The Oligocene Epoch (34-23 Million Years ago) - Paleontology World
The Oligocene epoch was a golden age for whales, rich in transitional species like Aetiocetus,Janjucetus and Mammalodon (which possessed both teeth and plankton-filtering baleen plates) Prehistoric sharks continued to be the apex predators of the high seas; it was toward the end of the Oligocene, 25 million years ago, that the gigantic
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