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Triassic
215
Silurian
210
To 1500
188
Cambrian
182
Pliocene
156
Holocene
154
21st century
151
Pennsylvanian
146
Oligocene
105
1900-1999
104
Proterozoic
86
Mississippian
81
Neogene
72
1800-1899
52
Archaean
49
Paleocene
49
From 2 million years ago
40
Paleogene
34
1933-1945
33
1800 - 1899
27
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