Era
19th century
6
Quaternary
6
Triassic
6
20th century
5
1642-1727
4
1879-1955
4
Cretaceous
4
Cambrian
3
Cenozoic
3
Ordovician
3
1571-1630
2
1838-1914
2
18th century
2
1991-2000
2
Eocene
2
Mesozoic
2
Miocene
2
Mississippian
2
Paleozoic
2
Pennsylvanian
2
Permian
2
Pleistocene
2
Precambrian
2
1473-1543
1
1497-1558
1
1564-1642
1
1578-1657
1
1588-1679
1
1608-1679
1
1627-1691
1
1660-1753
1
1717-1783
1
1718
1
1741-1827
1
1773-1829
1
1777-1855
1
1795-1842
1
1802-1860
1
1804-1881
1
1809-1882
1
1818-1889
1
1821-1887
1
1828-1906
1
1838-1907
1
1838-1916
1
1838-1923
1
1840-1920
1
1850-1880
1
1850-1943
1
1867-1934
1
more ...