Era
20th century
231
18th century
178
19th century
131
1961-1970
98
1770-1827
76
1991-2000
76
1951-1960
65
1756-1791
64
1685-1750
63
17th century
59
1981-1990
56
1971-1980
53
1813-1883
52
16th century
50
2001-2010
48
Cretaceous
41
500-1400
34
Quaternary
33
1813-1901
30
1685-1759
27
1833-1897
27
1882-1971
26
21st century
25
1931-1940
21
1797-1828
20
1860-1911
20
1732-1809
19
1941-1950
19
2011-2020
18
Jurassic
18
1564-1616
17
15th century
17
1862-1918
17
Cenozoic
16
Paleozoic
16
1810-1856
15
1918-1990
15
1921-1930
15
1811-1886
14
1842-1900
14
1941-
14
Precambrian
14
1803-1869
13
1809-1847
13
1810-1849
13
1840-1893
13
1858-1924
13
1864-1949
12
1874-1954
12
Tertiary
12
more ...