Era
1983
46
1981
39
1982
35
1986
31
1985
29
1987
28
1984
26
1988
25
1990
22
1989
18
1980
16
1991
15
1992
10
1994
10
1973
8
1976
8
1979
8
1971
6
1978
6
2003
6
From 2 million years ago
6
Quaternaire
6
Quaternary
6
1969
5
1972
5
1995
5
1999
5
19e siècle
5
2000
5
2007
5
Paleozoic
5
Paléozoïque
5
Precambrian
5
Précambrien
5
1970
4
1975
4
1977
4
1998
4
2001
4
2004
4
From 570 million to 5 billion years ago
4
1922-
3
1966
3
1968
3
1974
3
1993
3
1996
3
19th century
3
From 230 to 570 million years ago
3
1879-1955
2
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