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Subject (Era)
- Quaternary532
- Cretaceous470
- Tertiary383
- Precambrian342
- Paleozoic330
- Pleistocene297
- Devonian249
- Cenozoic200
- Jurassic192
- Ordovician189
- Permian177
- Carboniferous165
- Mesozoic156
- Triassic146
- Cambrian132
- Mississippian131
- Pennsylvanian129
- Silurian129
- Eocene128
- Miocene112