Geologic Time Scale

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Last updated 1:44 PM on 7/30/26
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37 Terms

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4560 million years

Beginning of the Hadean Eon. Birth of the Earth.

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4000 million years

End of the Hadean Eon. Beginning of the Archean Eon. Beginning of the Eoarchean Era.

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3600 million years

Beginning of the Paleoarchean Era.

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3200 million years

Beginning of the Mesoarchean Era.

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2800 million years

Beginning of the Neoarchean Era.

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2500 million years

End of the Archean Eon. Beginning of the Proterozoic Eon. Beginning of the Paleoproterozoic Era.

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1600 million years

Beginning of the Mesoproterozoic Era.

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Siderian, Rhyacian, Orosirian, Statherian

Periods of the Paleoproterozoic Era.

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Calymmian, Ectasian, Stenian

Periods of the Mesoproterozoic Era.

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1000 million years

Beginning of the Neoproterozoic Era. Beginning of the Tonian Period.

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850 million years

Beginning of the Cryogenian Period.

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635 million years

Beginning of the Ediacaran Period.

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Tonian, Cryogenian, Ediacaran

Periods of the Neoproterozoic Era.

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542 million years

Beginning of the Phanerozoic Eon. Beginning of the Paleozoic Era. Beginning of the Cambrian Period.

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488 million years

Beginning of the Ordovician Period.

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447 million years

Beginning of the Silurian Period.

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416 million years

Beginning of the Devonian Period.

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359 million years

Beginning of the Mississippian Period.

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318 million years

Beginning of the Pennsylvanian Period.

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299 million years

Beginning of the Permian Period.

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251 million years

Beginning of the Mesozoic Era. Beginning of the Triassic Period.

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200 million years

Beginning of the Jurassic Period.

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145 million years

Beginning of the Cretaceous Period.

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65 million years

Beginning of the Tertiary Period. Beginning of the Paleogene Period. Beginning of the Paleocene Epoch. Beginning of the Cenozoic Era. End of the Mesozoic Era.

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56 million years

Beginning of the Eocene Epoch.

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34 million years

Beginning of the Oligocene Epoch. End of the Paleogene Period.

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23 million years

Beginning of the Neogene Period. Beginning of the Miocene Epoch.

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5 million years

Beginning of the Pliocene Epoch. End of the Neogene Period.

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1.80 million years

Beginning of the Quaternary Period. Beginning of the Pleistocene Epoch.

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0.010 million years

Beginning of the Holocene Epoch.

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Paleozoic, Mesozoic, Cenozoic

Era divisions of the Phanerozoic Eon.

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Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian

Period divisions of the Paleozoic Era.

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Triassic, Jurassic, Cretaceous

Period divisions of the Mesozoic Era.

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Paleogene, Neogene, Quaternary

Period divisions of the Cenozoic Era.

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Paleocene, Eocene, Oligocene

Epoch divisions of the Paleogene Period.

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Miocene, Pliocene

Epoch divisions of the Neogene Period.

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Pleistocene, Holocene

Epoch divisions of the Quaternary Period