| eocene | <geology> Pertaining to the first in time of the three subdivisions into which the Tertiary formation is divided by geologists, and alluding to the approximation in its life to that of the present era; as, Eocene deposits. The Eocene formation. Origin: Gr. Daybreak, dawn + new, recent. Source: Websters Dictionary (01 Mar 1998) |
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| eocene | from 40 million to 58 million years ago |
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| eocene | from 40 million to 58 million years ago |
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