Era
Cretaceous
66
Quaternary
30
Cenozoic
29
Paleozoic
26
Tertiary
22
Miocene
17
Jurassic
16
Precambrian
15
Mesozoic
14
Permian
11
Holocene
10
Pleistocene
10
Pliocene
10
Mississippian
8
Proterozoic
8
Neogene
7
Oligocene
6
Pennsylvanian
6
Paleogene
5
Triassic
5
Eocene
4
Ordovician
4
Paleocene
4
Silurian
3
Archaean
2
Cambrian
2
Carboniferous
2
1878-1974
1
1881-1971
1
1882-1966
1
1944-
1
1946-
1
Devonian
1
Earthquake, 1989
1