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Subject (Era)
- Cretaceous35
- Paleozoic21
- Devonian18
- Mississippian16
- Jurassic12
- Tertiary11
- Mesozoic10
- Permian10
- Silurian10
- From 65 to 140 million years ago9
- Eocene8
- From 230 to 570 million years ago7
- Pennsylvanian7
- Cenozoic6
- Miocene5
- Ordovician5
- Cambrian4
- From 310 to 345 million years ago4
- Paleocene4
- From 345 to 405 million years ago3