Era
Jurassic
15
1801-1900
12
Cretaceous
10
Tertiary
10
Triassic
9
Carboniferous
4
Devonian
4
Pleistocene
4
Proterozoic
4
Quaternary
4
1831-1900
3
Archaean
3
Geschichte
3
Ordovician
3
Paleozoic
3
19th Century
2
19th century
2
Geschichte 1913
2
Huronian
2
Laurentian
2
Precambrian
2
(1816-1883)
1
1800-1870
1
1850
1
1857
1
1860
1
1897
1
1901
1
1901-
1
19e siècle
1
19e siècle
1
Early works to 1800
1
From 190 to 230 million years ago
1
From 570 million to 5 billion years ago
1
Geschichte 1800-1900
1
Permian
1
Pliocene
1