The Oligocene (IPA: / ˈɒlɪɡəsiːn, - ɡoʊ -/ 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).

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 Chattian .

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.

2018年5月29日 · The Oligocene Epoch is the third epoch in the Tertiary Period (in the alternative, the latest (most recent) epoch in the Paleogene Period). The Oligocene Epoch lasts from approximately 34 million years ago (mya) to 23 mya.

The Oligocene was the last major geologic subdivision of the Paleogene period (65-23 million years ago), following the Paleocene (85-56 million years ago) and Eocene (56-34 million years ago) epochs; all of these periods and epochs were themselves part of the Cenozoic Era (65 million years ago to the present). Climate and geography.

2014年4月29日 · The name Oligocene comes from the Greek ὀλίγος (oligos, few) and καινός (kainos, new), and refers to the sparsity of additional modern mammalian species of fauna after a burst of evolution during the Eocene. The Oligocene is preceded by the Eocene epoch and is followed by the Miocene epoch.

2019年2月28日 · 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.

The Oligocene follows the Eocene epoch and is followed by the Miocene epoch. The start of the Oligocene is marked by a extinction event that may be related to the impact of large extraterrestrial object in Siberia and/or near Chesapeake Bay.

Oligocene Period is the third and last major worldwide division of the Paleogene Period which is 65.5 million to about 23 million years ago. This is the interval between 33.9 million to 23 million years ago.

Multiple-proxy Oligocene surface temperature records document consistent warmth at higher latitudes (Figs. 3C and 4), which is, at first glance, difficult to reconcile with the presence of 1) a relatively cool deep ocean (Fig. 3D), 2) Southern Hemisphere ice, and 3) climate models.