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This Concept Map has information related to: Ch. 20 Dean Freundlich, Mesozoic has periods, Has no Epoch Cambrian, Paleoproterozoic happened 2500-1600 mya, Mesozoic is a era in Phanerozoic, Cretaceous one is a periods, Time Divisions of evolution there are Eons, Eoarchean is a era in Archean, End of Ice Age happened in Holocene, Ordovician five Periods, Oligocene three Epoch