Era
Carboniferous
54
Devonian
42
Cretaceous
33
From 280 to 345 million years ago
29
From 345 to 405 million years ago
23
Eocene
22
17th century
17
From 65 to 140 million years ago
16
16th century
15
1894-1966
15
From 40 to 55 million years ago
14
Paleozoic
14
1600-1699
10
1623-1688
10
1894-
7
19th century
7
From 230 to 570 million years ago
7
Miocene
7
Pleistocene
7
Quaternary
7
Tertiary
7
1514-1564
6
20th century
6
Jurassic
6
Oligocene
6
Cambrian
5
From 10 thousand to 2 million years ago
5
From 10 to 25 million years ago
5
From 140 to 190 million years ago
5
Paleocene
5
Pliocene
5
1500-1599
4
1548-1620
4
1550-1632
4
1796-1874
4
From 2 million years ago
4
From 2 to 65 million years ago
4
1500 - 1599
3
1578
3
1584-1667
3
1877-
3
18th century
3
1904-1974
3
1926-
3
Early works to 1800
3
From 2 to 10 million years ago
3
Pennsylvanian
3
1517-1585
2
1581
2
1597-1654
2
more ...