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adj. of the oligocene period (geological period characterized by the presence of saber-toothed cats)
n. epoch in the Tertiary period characterized by the presence of saber-toothed cats (Geology)
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The Oligocene (symbol OG) is a geologic epoch of the Paleogene Period and extends from about 34 million to 23 million years before the present ( to ). 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. The name Oligocene comes from the Greek (oligos, few) and (kainos, new), and refers to the sparsity of additional modern mammalian species of fauna after a burst of evolution during the Eocene. The Oligocene follows the Eocene Epoch and is followed by the Miocene Epoch. 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. Major changes during the Oligocene included a global expansion of grasslands, and a regression of tropical broad leaf forests to the equatorial belt.
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1. from 40 million to 25 million years ago; appearance of sabertoothed cats
(synonym) Oligocene epoch
(part-holonym) Tertiary, Tertiary period
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adj. Oligocene, of the oligocene period (geological period characterized by the presence of saber-toothed cats)
nm. Oligocene, epoch in the Tertiary period characterized by the presence of saber-toothed cats (Geology)
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nm. Oligocene Epoch
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