Cz |
Paleogene |
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Mz |
Cretaceous |
Upper Cretaceous Stages 83-97 mya |
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Jurassic |
Upper
and Middle Jurassic Stages 154-174 mya |
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Triassic |
Lower |
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Pz |
Permian | ||
Carboniferous |
Pennsylvannian |
Mississippian |
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Mississippian |
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Devonian |
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Silurian |
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Ordovician |
Lower
and |
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Cambrian |
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Npz |
Ediacaran |
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