Era
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1914-1999
1
1924-2014
1
1937-2016
1
1939-
2
1939-1945
1
1940-1944
1
1945-
1
1949-
1
1951-1960
2
1956-
2
1958-
2
1961-1975
1
1966-
1
1967-
2
1973
1
1978-
1
19th century
23
20th century
24
21st century
1
Carboniferous
1
Cenozoic
3
Civil War, 1861-1865
3
Cretaceous
31
Devonian
1
Eocene
1
From 10 thousand to 2 million years ago
1
From 140 to 190 million years ago
3
From 190 to 230 million years ago
1
From 2 million years ago
3
From 2 to 65 million years ago
1
From 230 to 280 million years ago
10
From 230 to 570 million years ago
1
From 280 to 345 million years ago
2
From 310 to 345 million years ago
3
From 310 to 405 million years ago
1
From 40 to 65 million years ago
1
From 570 million to 2 billion years ago
4
From 570 million to 5 billion years ago
6
From 65 million years ago
3
From 65 to 140 million years ago
29
From 65 to 570 million years ago
1
German occupation, 1940-1945
1
Indian occupation, 1973
2
Jurassic
3
Mesozoic
1
Mississippian
6
Paleocene
2
Paleozoic
2
Pennsylvanian
2
Permian
10
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