Geologic-time

geologic time

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

Origin:
1860–65

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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.
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