Era
1981
110
1983
108
1986
105
1985
101
1982
100
1990
100
1987
99
1984
97
1989
88
1988
87
1991
76
1980
64
1993
52
1992
45
1978
43
1979
41
2003
40
1976
39
1977
39
1999
37
2001
37
1997
34
1995
31
1994
30
1974
29
2000
29
1998
26
1975
25
1996
25
2004
25
1973
24
1972
21
2007
21
2002
20
1970
19
2009
19
1971
18
1969
17
2008
15
2005
14
Paleozoic
14
Paléozoïque
14
From 230 to 570 million years ago
12
Precambrian
12
Précambrien
12
Permian
10
Permien
10
Quaternaire
10
Quaternary
10
From 2 million years ago
9
more ...