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65
Cenozoic Era begins
End of the Mesozoic Era and beginning of the Cenozoic Era known as the Age of Mammals or current Era -
245
Mesozoic Era begins
End of the Paleozoic Era and beginning of the Mesozoic Era often known as the age of the dinosaurs -
541
Paleozoic Era begins
Beginning of the Paleozoic Era meaning "time of ancient life"
