geological period

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Noun1.geological period - a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
geological era, era - a major division of geological time; an era is usually divided into two or more periods
epoch - a unit of geological time that is a subdivision of a period and is itself divided into ages
glacial epoch, glacial period, ice age - any period of time during which glaciers covered a large part of the earth's surface; "the most recent ice age was during the Pleistocene"