Era
19th century
2
20th century
2
Pleistocene
2
1791-1862
1
1825-1895
1
1836-1923
1
1849-1938
1
1860-1890
1
1867-1934
1
1882-1981
1
1887-1961
1
1887-1975
1
18th century
1
1904-1967
1
1908-1993
1
1912-1954
1
1928-1990
1
1940-
1
1944-
1
1976-
1
1985 or 1986-
1
21st century
1
Cenozoic
1
Cretaceous
1
Holocene
1
Miocene
1
Oligocene
1
Paleozoic
1
To 1964
1