Era
Cretaceous
95
Precambrian
87
Quaternary
77
Paleozoic
65
Pennsylvanian
58
Tertiary
53
Cenozoic
51
Permian
42
Mesozoic
41
Pleistocene
30
Jurassic
29
Ordovician
22
Devonian
21
Triassic
21
Mississippian
20
Cambrian
18
Carboniferous
16
Eocene
15
Miocene
13
Holocene
11
Silurian
11
Neogene
10
Oligocene
9
Pliocene
9
Archaean
8
Paleocene
7
Proterozoic
7
Anthropocene
2
Paleogene
2
1829-1887
1
1848-1927
1
1860-1890
1
1884-1955
1
1890-
1
1894-1964
1
19th century
1
Huronian
1