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Subject (Era)
- Cretaceous21
- Paleozoic13
- Devonian9
- Jurassic8
- Mississippian8
- Silurian7
- Tertiary7
- From 230 to 570 million years ago5
- From 65 to 140 million years ago5
- Mesozoic5
- Eocene3
- From 345 to 405 million years ago3
- From 65 to 570 million years ago3
- Miocene3
- Ordovician3
- Cambrian2
- From 140 to 190 million years ago2
- From 310 to 345 million years ago2
- From 425 to 570 million years ago2
- Neogene2