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Oligocene

Pronunciation: /ˈɒlɪgə(ʊ)siːn/

Definition of Oligocene

adjective

Geology

relating to or denoting the third epoch of the Tertiary period, between the Eocene and Miocene epochs.
(as noun the Oligocene) the Oligocene epoch or the system of rocks deposited during it.

The Oligocene epoch lasted from 35.4 to 23.3 million years ago. It was a time of falling temperatures, with evidence of the first primates