Era
1829-1887
1
1859-1952
1
1860-1890
1
19th century
1
Archaean
2
Carboniferous
4
Cenozoic
1
Cretaceous
24
Devonian
2
Eocene
13
Holocene
1
Jurassic
3
Mesozoic
3
Miocene
1
Paleocene
4
Paleogene
1
Paleozoic
3
Pennsylvanian
3
Permian
8
Pleistocene
2
Precambrian
9
Proterozoic
3
Quaternary
1
Tertiary
8
Triassic
3