Era
Cretaceous
121
Permian
103
From 65 to 140 million years ago
47
Paleozoic
47
Pennsylvanian
41
Tertiary
39
From 230 to 280 million years ago
38
Quaternary
24
From 230 to 570 million years ago
23
Eocene
19
Precambrian
18
Carboniferous
16
Cenozoic
15
Ordovician
14
From 2 to 65 million years ago
13
Jurassic
12
Cambrian
10
Pleistocene
10
From 2 million years ago
9
Miocene
9
From 280 to 310 million years ago
8
From 280 to 345 million years ago
8
Mesozoic
8
From 230 to 310 million years ago
7
From 570 million to 5 billion years ago
7
Oligocene
7
From 140 to 190 million years ago
6
From 425 to 500 million years ago
6
Triassic
6
Devonian
5
From 2 to 140 million years ago
5
From 25 to 40 million years ago
5
From 65 million years ago
5
1858-1941
4
From 10 to 25 million years ago
4
From 500 to 570 million years ago
4
1981-
3
From 190 to 230 million years ago
3
From 40 to 55 million years ago
3
Mississippian
3
Neogene
3
1807-1865
2
1807-1867
2
1818-1891
2
From 10 thousand to 10 million years ago
2
From 10 thousand to 2 million years ago
2
From 345 to 405 million years ago
2
From 65 to 280 million years ago
2
Silurian
2
1865 - 1950
1
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