geologic time


the succession of eras, periods, and epochs as considered in historical geology.

Origin of geologic time

First recorded in 1860–65 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for geologic time

geologic time
[ jē′ə-lŏjĭk ]

The period of time covering the formation and development of the Earth, from about 4.6 billion years ago to today.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.