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Subject (Era)
- Pleistocene13
- Tertiary11
- Cenozoic7
- Cretaceous7
- Miocene7
- Eocene6
- Permian6
- From 2 to 65 million years ago4
- Carboniferous3
- Pliocene3
- From 40 to 55 million years ago2
- From 65 to 140 million years ago2
- From 10 thousand to 2 million years ago1
- From 10 thousand to 25 million years ago1
- From 10 to 25 million years ago1
- From 2 to 10 million years ago1
- From 2 to 280 million years ago1
- From 230 to 345 million years ago1
- From 55 to 65 million years ago1
- Neogene1