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Cenozoic
30
Cretaceous
28
Pliocene
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Quaternary
24
Paleozoic
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Tertiary
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Miocene
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Holocene
15
Mesozoic
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Pleistocene
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Precambrian
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1945-
9
Eocene
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Proterozoic
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Oligocene
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Pennsylvanian
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Neogene
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Mississippian
5
Permian
5
Triassic
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