Era
Precambrian
19
Cretaceous
15
Cenozoic
14
Ordovician
10
Proterozoic
10
Quaternary
9
From 65 million years ago
8
Mississippian
8
Pleistocene
8
Pliocene
8
From 570 million to 2 billion years ago
7
From 570 million to 5 billion years ago
7
Pennsylvanian
7
From 65 to 140 million years ago
6
Paleozoic
6
Permian
5
From 425 to 500 million years ago
4
Mesozoic
4
19th century
3
From 10 thousand to 2 million years ago
3
From 2 million years ago
3
From 230 to 570 million years ago
3
From 65 to 230 million years ago
3
Jurassic
3
Silurian
3
Tertiary
3
Triassic
3
1878
2
Cambrian
2
From 10 to 25 million years ago
2
From 140 to 190 million years ago
2
From 2 to 10 million years ago
2
From 230 to 280 million years ago
2
From 280 to 345 million years ago
2
From 310 to 345 million years ago
2
From 405 to 500 million years ago
2
From 425 million to 5 billion years ago
2
Miocene
2
Quaternaire
2
1829-1887
1
1838-1879
1
1886-
1
1972
1
From 10 thousand to 10 million years ago
1
From 190 to 230 million years ago
1
From 190 to 280 million years ago
1
From 2 to 65 million years ago
1
From 280 to 310 million years ago
1
From 500 million to 5 billion years ago
1
From 65 million to 2 billion years ago
1
more ...