proterozoic
Noun
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is a part of: precambrian, precambrian aeon, precambrian eon, precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years agosame as: proterozoic aeon, proterozoic eon
Adjective
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referred to in: geology - a science that deals with the history of the earth as recorded in rockssimilar to: early - at or near the beginning of a period of time or course of events or before the usual or expected time
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