Era
1848-1929
1
1860-1939
1
1864-1953
1
1890-1980
1
1938-
1
1947-
1
1960-1988
1
1965-1980
1
1975-1994
1
21st century
1
Archaean
1
Cambrian
2
Carboniferous
3
Cenozoic
2
Cretaceous
3
Devonian
2
Holocene
1
Mesozoic
8
Miocene
2
Oligocene
1
Ordovician
1
Paleozoic
3
Permian
4
Pleistocene
2
Precambrian
10
Proterozoic
4
Quaternary
4
Tertiary
5
Triassic
1