geologic time

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

1860–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
geologic time   (jē'ə-lŏj'ĭk)  Pronunciation Key 

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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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