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Eocene

Pronunciation: /ˈiːə(ʊ)siːn/

Definition of Eocene

adjective

Geology

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

The Eocene epoch lasted from 56.5 to 35.4 million years ago. It was a time of rising temperatures, and there was an abundance of mammals, including the first horses, bats, and whales