Era
Jurassic
9
Triassic
6
Cretaceous
3
Devonian
3
Quaternary
3
1801-1900
2
Carboniferous
2
Geschichte
2
Geschichte 1773-1893
2
Geschichte 1899
2
Geschichte 1913
2
Pleistocene
2
Proterozoic
2
1831-1900
1
1860
1
1897
1
1901
1
1901-
1
19th Century
1
Archaean
1
Geschichte 1800-1900
1
Huronian
1
Laurentian
1
Permian
1
Tertiary
1