geologic time


geologic time

noun

Definition of GEOLOGIC TIME

:  the long period of time occupied by the earth's geologic history
geologic time table

First Known Use of GEOLOGIC TIME

1861

geologic time

noun    (Concise Encyclopedia)

Interval of time occupied by the Earth's geologic history, extending from c. 3.9 billion years ago (corresponding to the age of the oldest known rocks) to the present day. It is, in effect, the part of the Earth's history that is recorded in rock strata. The geologic time scale is classified in nested intervals distinguished by characteristic geologic and biologic features. From longest to shortest duration, the intervals are eon, era, period, and epoch.

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