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Era
- Cretaceous313
- Tertiary186
- Paleozoic122
- Eocene109
- Permian106
- Quaternary106
- Miocene102
- Precambrian102
- Cenozoic92
- Jurassic82
- Mississippian80
- Devonian74
- Ordovician73
- Pennsylvanian70
- Mesozoic68
- Pleistocene65
- Triassic63
- Proterozoic54
- Pliocene46
- Oligocene45