geological era

Definitions of geological era

n a major division of geological time; an era is usually divided into two or more periods

Age of Mammals
approximately the last 63 million years
Age of Reptiles
from 230 million to 63 million years ago
Paleozoic era
from 544 million to about 230 million years ago
Type of:
geologic time, geological time
the time of the physical formation and development of the earth (especially prior to human history)

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