Era
20th century
12
21st century
12
19th century
8
To 1500
6
1859-1938
5
1945-
4
1991-
4
Precambrian
4
Quaternary
4
18th century
3
1946-
3
1947-
3
2000-
3
476-1492
3
17th century
2
1854-1912
2
1881-1966
2
1896-1980
2
1935-
2
1938-
2
1948-
2
1949-
2
1950-
2
1976-
2
Tertiary
2
-1985
1
-524
1
1081-1151
1
1483-1546
1
1492-
1
1646-1716
1
1703-1758
1
1758-1823
1
1781-1848
1
1802-1860
1
1809-1877
1
1809-1882
1
1833-1896
1
1834-1903
1
1838-1917
1
1842-1912
1
1844-1900
1
1851-1938
1
1852-1934
1
1858-1947
1
1866-1938
1
1875-1961
1
1876-1956
1
1879-1955
1
1883-1950
1
more ...