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Eons and Eras


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Precambrian
c. 4570–542 mya
Hadean
c. 4570–3800 mya
Archean
3800–2500 mya
Proterozoic
2500–542 mya
Phanerozoic
Since 542 mya
Paleozoic
542–251 mya
Mesozoic
250–65 mya
Cenozoic
Since 65 mya