Era
Quaternary
10
Cenozoic
6
Cretaceous
6
Pleistocene
6
From 2 million years ago
5
Holocene
5
Neogene
5
Jurassic
4
Mesozoic
4
Triassic
4
Early works to 1800
3
From 10 thousand years ago
3
Miocene
3
Paleozoic
3
Permian
3
Pliocene
3
Tertiary
3
19th century
2
Devonian
2
Eocene
2
From 2 to 25 million years ago
2
From 2 to 65 million years ago
2
From 230 to 570 million years ago
2
From 65 million years ago
2
From 65 to 140 million years ago
2
Paleocene
2
(19...-....;
1
1728-1785
1
1743-1820
1
1782-1867
1
1783
1
1799-1874
1
1800 - 1899
1
1800 - 1999
1
1835-1894
1
1848
1
1864-1945
1
1879-1965
1
1883-1950
1
1884-1946
1
1904-1971
1
1905-1979
1
1906-
1
1906-1999
1
1914-2011
1
1944-
1
1976-2000
1
1984
1
19th Cent
1
2007
1
more ...