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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 ...
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 .
28 lut 2019 · 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).
Oligocene Epoch, Major division of the Paleogene Period, from c. 33.9 million to 23 million years ago. It follows the Eocene Epoch and precedes the Miocene Epoch. The term (from the Greek for “few recent forms”) refers to the small number of modern animals that originated during this epoch.
29 maj 2018 · 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.
29 kwi 2014 · The Oligocene is the third and final epoch of the Paleogene period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene.
