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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Example sentences
While to human observers that's ancient history, in geologic time it's a blink
  of an eye ago.
Yeah, the difference between geologic time and human time is immense.
The age of formations is marked on a geologic calendar known as the geologic
  time scale.
Geologic time is subdivided into age, era and period in decreasing lengths of
  time involved.
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