Geological time scale

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Last updated 1:52 PM on 9/15/26

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Eons

Hadean, Archean, Proterozoic, Phanerozoic

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Eras of Phanerozoic

Paleozoic, Mesozoic, Cenozoic

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Periods in Paleozoic

Cambrian, Ordovician, Silurian, Devonian, Carboniferous (Mississippian and Pennsylvanian), Permian

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Periods in Mesozoic

Triassic, Jurassic, Cretaceous

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Periods in Cenozoic

Paleogene, Neogene, Quaternary