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Subject (Era)
- Cretaceous23
- From 65 to 140 million years ago17
- Jurassic7
- Eocene5
- From 140 to 190 million years ago4
- From 230 to 570 million years ago4
- From 65 to 230 million years ago4
- Mesozoic4
- Paleozoic4
- From 40 to 55 million years ago3
- Permian3
- Cambrian2
- From 190 to 230 million years ago2
- From 500 to 570 million years ago2
- Pennsylvanian2
- Tertiary2
- Triassic2
- Cenozoic1
- Devonian1
- From 10 thousand to 2 million years ago1