Akademik

geologic time
noun
the time of the physical formation and development of the earth (especially prior to human history)
• Syn: ↑geological time
• Hypernyms: ↑time
• Hyponyms:
↑eon, ↑aeon, ↑period, ↑geological period, ↑era, ↑geological era, ↑epoch

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noun
: the long period dealt with by historical geology; especially : the period prior to human history

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the succession of eras, periods, and epochs as considered in historical geology.
[1860-65]

Useful english dictionary. 2012.