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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.
A period within the Palaeogene part of the Tertiary.
in geological time, an epoch within the Cenozoic dating from 35 to 58 million years ago.
Eocene - 55 to about 35 million years ago, an epoch of the Tertiary Period. Also the rocks formed during this time.
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