From 58 million to 40 million years ago; presence of modern mammals
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;
Noun
from 58 million to 40 million years ago; presence of modern mammals
a.
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.
n.
The Eocene formation.
Eocene
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;
Usage Examples
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