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Paleozoic
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417
Mesozoic
35
Precambrian
24
From 230 to 570 million years ago
7
Cenozoic
5
Pennsylvanian
4
Carboniferous
3
Devonian
3
Permian
3
Silurian
3
Triassic
3
From 230 million to 5 billion years ago
2
Cambrian
1
Cretaceous
1
Jurassic
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Ordovician
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Quaternary
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Tertiary
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