Oligocene meaning

ŏlĭ-gō-sēn, ōlĭ-
Of, relating to, or being the epoch of geologic time from about 34 to 23 million years ago, the third epoch of the Tertiary Period. It is characterized by further development of modern mammals, including the rise of the true carnivores and their gradual replacement of the creodonts.
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The Oligocene Epoch.
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Designating or of the third and last geologic epoch of the Paleogene, characterized by cold climate, the formation of vast grasslands, and the further development of mammals.
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The third epoch of the Tertiary Period, from about 37 to 24 million years ago. During this time there was an increase in volcanic activity, and Australia and South America separated from Antarctica. The climate started to cool and a glacier started to form in Antarctica. Modern mammalian groups continued to develop, and the first cats, dogs, horses, and related mammals appeared. Artiodactyls (even-toed ungulates) took over from the perissodactyls (uneven-toed ungulates) as the dominant medium-sized herbivores. Many types of grass also first appeared at this time.
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the Oligocene
  • The Oligocene Epoch or its rocks.
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Idioms and Phrasal Verbs

the Oligocene