Geological time scale

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Last updated 9:54 AM on 6/12/26
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23 Terms

1
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Phanerozoic Eon

541 Ma – present

2
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Proterozoic Eon

2.5 Ga – 541 Ma

3
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Archean Eon

4.0 Ga – 2.5 Ga

4
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Hadean Eon

4.54 Ga – 4.0 Ga

5
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Paleozoic Era

541 Ma – 252 Ma

6
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Mesozoic Era

252 Ma – 66 Ma

7
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Cenozoic Era

66 Ma – present

8
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Cambrian Period

541 Ma – 488 Ma

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Ordovician Period

488 Ma – 420 Ma

10
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Silurian Period

420 Ma – 400 Ma

11
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Devonian Period

400 Ma – 360 Ma

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Carboniferous Period

360 Ma – 300 Ma

13
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Permian Period

300 Ma – 252 Ma

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Triassic Period

252 Ma – 200 Ma

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Jurassic Period

200 Ma – 145 Ma

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Cretaceous Period

145 Ma – 66 Ma

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Paleocene Epoch

66 Ma – 56 Ma

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Eocene Epoch

56 Ma – 34 Ma

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Oligocene Epoch

34 Ma – 23 Ma

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Miocene Epoch

23 Ma – 5.5 Ma

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Pliocene Epoch

5.5 Ma – 2.5 Ma

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Pleistocene Epoch

2.5 Ma – 11.8 Ka

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Holocene Epoch

11.8 Ka – present