geological era

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Noun1.geological era - a major division of geological time; an era is usually divided into two or more periods
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"