Era
20th century
7
1809-1882
3
1871-1945
2
1902-1968
2
1918-1988
2
1945-1989
2
19th century
2
1265-1321
1
1608-1674
1
1642-1727
1
1685-1753
1
1749-1832
1
1805-1880
1
1879-1955
1
1895-1979
1
18th century
1
1907-1977
1
1908-1964
1
1909-2000
1
1917-2019
1
1922-1996
1
1925-2016
1
1934-
1
1945-
1
21st century
1
Cenozoic
1
Cretaceous
1
Tertiary
1