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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 Dictionary, © Random House, Inc. 2017.
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geologic time in Science
geologic time

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 © 2002. Published by Houghton Mifflin. All rights reserved.
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