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Subject (Era)
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Tertiary
145
Cretaceous
140
Pleistocene
121
Devonian
109
Paleozoic
82
Quaternary
75
Jurassic
70
Precambrian
67
Silurian
64
Permian
61
Carboniferous
60
Ordovician
55
Pennsylvanian
54
Mississippian
53
Triassic
48
Miocene
46
1801-1900
43
Cambrian
40
Cenozoic
35
From 2 to 65 million years ago
34