Geologic Time Scale

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Eons, Eras, Periods

Last updated 2:09 AM on 4/23/26
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24 Terms

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Eon 1

Archean

2
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Eon 2

Proterozoic

3
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Eon 3

Phanerozoic

4
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Era 1

Neo-Proterozoic

5
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Era 2

Paleozoic

6
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Era 3

Mesozoic

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Era 4

Cenozoic

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Period 1

Cambrian

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Period 2

Ordovician

10
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Period 3

Silurian

11
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Period 4

Devonian

12
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Period 5

Carboniferous

13
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Period 6

Permian

14
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Period 7

Triassic

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Period 8

Jurassic

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Period 9

Cretaceous

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Period 10

Paleogene

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Period 11

Neogene

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Period 12

Quaternary

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Start of Earth

4.56 Ga

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End of Precambrian

542 Ma

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End of Paleozoic

252 Ma

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KPG

66 Ma

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Start of Holocene

11,700 Years