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Proterozoic

About 542 million years ago is known as the Proterozoic which was divided into three eras. A lot of the world's most exciting events in history occurred during the Proterozoic. The youngest of the two divisions is the Proterozoic Eon of the Precambrian Time.

proterozoic
phanerozoic
geologic time   Hadean   Archean   Proterozoic   Phanerozoic