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Phanerozoic

This time period covers about 542 million years. As time went by all continents were forced into a single land mas known as Pangaea. A few hundred groups of metazoa of the earlier Proterozoic have been identified since studied in those forms that started in the 1950s.

phanerozoic
geologic time   Hadean   Archean   Proterozoic   Phanerozoic