geologic time scale

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20 Terms

1
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HADEAN

4.6 bya

2
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ARCHEAN

4 bya

3
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PROTEROZOIC

2.5 bya

4
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PHANEROZOIC

541 mya

5
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Paleozoic

541 mya

6
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cambrian

541 mya

7
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ordovician

485.4 mya

8
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silurian

443.8 mya

9
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devonian

419.2 mya

10
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mississippian

358.9 mya

11
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pennsylvanian

323.2 mya

12
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permian

298.9 mya

13
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Mesozoic

251.9 mya

14
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triassic

251.9 mya

15
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jurassic

201.3 mya

16
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cretaceous

145 mya

17
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Cenozoic

66 mya

18
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paleogene

66 mya

19
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neogene

23 mya

20
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quarternary

2.6 mya