geological era

Thesaurus

Noun

1.

geological era - a major division of geological time; an era is usually divided into two or more periods era geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history) eon, aeon - the longest division of geological time geological period, period - a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"

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