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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 the last major subdivision of the Paleogene period, 23-34 million years ago. It saw the spread of grasses, the evolution of grazing mammals, and the emergence of whales, pinnipeds, and terror birds.
Learn about the Oligocene Epoch, a major division of the Paleogene Period, from 33.9 to 23 million years ago. Find out how it marked the origin of many modern animals and the expansion of grasslands.
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.
The Oligocene epoch is a division of the geologic time scale and the third and final epoch of the Paleogene period. It extends from about 34 million to 23 million years before the present. The Oligocene follows the Eocene epoch and is followed by the Miocene epoch.
