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|Noun||1.||geological time - the time of the physical formation and development of the earth (especially prior to human history)|
time - the continuum of experience in which events pass from the future through the present to the past
geological period, period - a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
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