when did geologic time start
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when did geologic time start, geological history of time, earliest geological time period, what came first in geologic time, history of earth through geologic time, history of geology timeline, what geological time period are we in, geologic time calendar year, geologic timeline of earth, what is the geologic timeline, what are the geologic time periods, period of geological time, geological history of earth timeline, timeline of earth's geology, timeline of geological periods, what is the geological timeline, geological timeline of earth