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In four to six sentences summarize the geologic timeline and major evolutionary events.
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In four to six sentences summarize the geologic timeline and major evolutionary events.

User Tiago Freitas Leal
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The largest unit of geologic time is an eon. Earth's 4.6-billion-year history is divided into four eons: the Hadean, Archean, Proterozoic, and Phanerozoic. The Hadean, Archean, and Proterozoic eons together are called Precambrian time.
User Amit Wagner
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