Era
Cretaceous
12
Pennsylvanian
8
Triassic
5
21st century
3
Carboniferous
3
From 65 to 140 million years ago
3
1905-1983
2
1952-
2
From 10 to 25 million years ago
2
Miocene
2
-2007
1
1879
1
1884-1920
1
1903-1986
1
1953-
1
1957-
1
1988
1
20th century
1
Crétacé
1
Eocene
1
From 190 to 230 million years ago
1
From 280 to 310 million years ago
1
From 280 to 345 million years ago
1
Miocène
1
Neogene
1
Paleozoic
1
Pennsylvanien
1
Permian
1
Precambrian
1
Tertiary
1
Trias
1
Vor- und Frühgeschichte
1
approximately 1525-1609
1