Era
19th century
40
20th century
32
Cenozoic
3
From 65 million years ago
3
Quaternary
3
From 2 million years ago
2
1857
1
1860
1
1864
1
1874
1
1879
1
1885-1945
1
1936
1
1939
1
1942
1
1948?
1
1951-
1
1966
1
1968
1
21st century
1
From 2 to 65 million years ago
1
Quaternaire
1
Since 1951
1
Tertiaire
1
Tertiary
1