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Subject (Era)
- Cretaceous12
- Mississippian7
- Paleozoic7
- Devonian6
- Jurassic5
- Tertiary5
- Cenozoic3
- From 65 to 140 million years ago3
- Permian3
- Eocene2
- From 2 to 65 million years ago2
- From 230 to 570 million years ago2
- Mesozoic2
- Miocene2
- Paleogene2
- Pennsylvanian2
- Silurian2
- Cambrian1
- Caspian Depression (Russia)1
- From 190 to 230 million years ago1