Era
Devonian
47
Ordovician
43
Paleozoic
28
Silurian
23
From 345 to 405 million years ago
20
Cambrian
16
Mississippian
13
Pennsylvanian
13
Pleistocene
11
Carboniferous
10
From 310 to 345 million years ago
8
19th century
7
From 10 thousand to 2 million years ago
7
From 230 to 570 million years ago
7
From 405 to 425 million years ago
6
From 425 to 500 million years ago
6
From 425 to 570 million years ago
6
Permian
6
Precambrian
6
From 280 to 310 million years ago
5
From 230 to 310 million years ago
4
From 280 to 345 million years ago
4
Pre-Quaternary
4
Triassic
4
1848-1927
3
From 570 million to 5 billion years ago
3
1776-1842
2
1793-1864
2
1852-1908
2
1856
2
Archaean
2
From 405 to 500 million years ago
2
Quaternary
2
-1872
1
1638-1715
1
1767-1847
1
1786-1853
1
1789-1867
1
1792-1850
1
1796-1885
1
1797-1881
1
1800-1859
1
1802-1880
1
1803-1882
1
1810-1888
1
1811-1898
1
1813
1
1819-1903
1
1820-1900
1
1822-1909
1
more ...