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Era
- Cretaceous350
- Tertiary190
- Quaternary135
- Paleozoic130
- Eocene118
- Precambrian110
- Permian107
- Cenozoic103
- Miocene102
- Jurassic89
- Mississippian81
- Ordovician78
- Devonian74
- Pennsylvanian72
- Mesozoic68
- Pleistocene66
- Triassic63
- Proterozoic55
- Cambrian50
- Oligocene47