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Subject (Era)
- Quaternary10
- Precambrian7
- Mesozoic5
- Triassic4
- Cretaceous3
- Eocene3
- From 65 to 230 million years ago3
- Jurassic3
- Pleistocene3
- From 40 to 55 million years ago2
- Paleozoic2
- Carboniferous1
- From 10 thousand to 5 billion years ago1
- From 2 to 140 million years ago1
- From 2 to 25 million years ago1
- From 230 to 570 million years ago1
- From 280 to 345 million years ago1
- Holocene1
- Neogene1
- Pennsylvanian1