Era
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1936-
4
1941-1950
4
1945-1989
4
1958-
4
1968
4
600-1500
4
Cretaceous
4
To 70 A.D.
4
1608-1674
3
1784-1857
3
1789-1869
3
1845-1849
3
1889-1976
3
1892-1973
3
1895-1958
3
1898-1980
3
1899-1961
3
1915-1968
3
1918-1945
3
1927-
3
1928-
3
1931-1990
3
1933-
3
1933-1945
3
1939-
3
1940-
3
1942-
3
1944-
3
1949-
3
1950-
3
1960-
3
1961-1975
3
1963-1969
3
1965-
3
1980
3
2000-2020
3
354-430
3
From 10 to 25 million years ago
3
From 140 to 190 million years ago
3
From 2 to 65 million years ago
3
Jurassic
3
Oligocene
3
Quaternary
3
Since 1951
3
To 70
3
approximately 335-approximately 394
3
-1155
2
-373
2
1066-1485
2
1135-1204
2
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