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Subject (Era)
- Tertiary4
- Paleozoic3
- Triassic3
- Permian2
- Proterozoic2
- 20th century1
- Cambrian1
- Cenozoic1
- Cretaceous1
- From 190 to 230 million years ago1
- From 190 to 570 million years ago1
- From 2 to 10 million years ago1
- From 2 to 65 million years ago1
- From 570 million to 2 billion years ago1
- Mesozoic1
- Mississippian1
- Pennsylvanian1
- Pliocene1
- Precambrian1