Era
Jurassic
19
1801-1900
15
Cretaceous
15
Tertiary
12
Triassic
12
Carboniferous
7
Devonian
7
Quaternary
7
Pleistocene
5
1831-1900
4
Paleozoic
4
Proterozoic
4
19e siècle
3
Archaean
3
Geschichte
3
Ordovician
3
19e siècle
2
19th Century
2
19th century
2
Geschichte 1817-1850
2
Geschichte 1913
2
Huronian
2
Laurentian
2
Mesozoic
2
Permian
2
Pliocene
2
Precambrian
2
(1635-1703)
1
(1816-1883)
1
1749-1832
1
1800-1870
1
1832-1913
1
1841
1
1850
1
1857
1
1860
1
1864
1
1876
1
1891
1
1897
1
1901
1
1901-
1
Alps
1
Early works to 1800
1
Franconian Jura
1
From 190 to 230 million years ago
1
From 570 million to 5 billion years ago
1
Geschichte 1800-1900
1
Geschichte 1830-1832
1
Geschichte 1834
1
more ...