Era
Cretaceous
6
Pleistocene
6
Pliocene
6
Precambrian
6
From 10 thousand to 10 million years ago
5
To 332 B.C
5
20th century
4
Eocene
4
From 65 to 140 million years ago
4
Oligocene
4
Quaternary
4
Tertiary
4
Miocene
3
19th century
2
From 2 million years ago
2
From 2 to 10 million years ago
2
From 2 to 65 million years ago
2
From 25 to 55 million years ago
2
From 570 million to 5 billion years ago
2
Paleozoic
2
Proterozoic
2
-1872
1
1767-1847
1
1786-1853
1
1789-1867
1
1792-1850
1
1796-1885
1
1797-1881
1
1800-1859
1
1802-1880
1
1803-1882
1
1810-1888
1
1819-1903
1
1820-1900
1
1822-1909
1
1823-1904
1
1828-1912
1
1854-1929
1
1857-1935
1
1857-1944
1
1859-1932
1
1907
1
1922-
1
1959
1
1971
1
2009
1
Cenozoic
1
Civil War, 1861-1865
1
From 10 thousand to 2 million years ago
1
From 10 to 25 million years ago
1
more ...