Era
Cretaceous
60
Tertiary
40
From 65 to 140 million years ago
37
Miocene
33
Pleistocene
28
Eocene
26
Paleozoic
25
From 2 to 65 million years ago
24
Mesozoic
24
Cenozoic
23
Jurassic
19
From 230 to 570 million years ago
18
Ordovician
18
From 10 to 25 million years ago
17
Devonian
15
From 40 to 55 million years ago
13
Silurian
13
Carboniferous
12
Permian
12
From 425 to 500 million years ago
11
Oligocene
11
Triassic
11
From 10 thousand to 2 million years ago
10
From 65 million years ago
10
Quaternary
10
From 140 to 190 million years ago
9
From 280 to 345 million years ago
9
Paleocene
9
19th century
8
From 65 to 230 million years ago
8
Pliocene
8
From 190 to 230 million years ago
7
1831-1899
6
20th century
6
Cambrian
6
From 2 to 25 million years ago
6
From 345 to 405 million years ago
6
Mississippian
6
Neogene
6
1840-1897
5
18th century
5
From 2 to 10 million years ago
5
From 310 to 345 million years ago
5
From 405 to 425 million years ago
5
From 230 to 280 million years ago
4
Pennsylvanian
4
1799-1847
3
2000-2020
3
From 10 to 40 million years ago
3
From 2 to 140 million years ago
3
more ...