Era
21st century
8
Cenozoic
6
Quaternary
6
20th century
4
Holocene
4
To 1500
4
2003-
3
1969-
2
1970-
2
19th century
2
2009-
2
Pliocene
2
1813-1855
1
1838-1914
1
1859-1927
1
1862-1927
1
1876-1962
1
1886-1948
1
1901-1978
1
1901-1978,
1
1901-1981
1
1907-1964
1
1919-2022
1
1931-2014
1
1933-2021
1
1936-
1
1937-
1
1939-
1
1944-1988
1
1945-2020
1
1946-
1
1958-
1
1980-2020
1
1989-
1
1993-2001
1
2000-
1
2001-2009
1
2002-
1
2020-
1
2021-
1
Anthropocene
1
Carboniferous
1
Civil War, 2011-
1
Empire, 30 B.C.-476 A.D.
1
Paleogene
1
Paleozoic
1
Pleistocene
1
active 1988-2013
1