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Cretaceous
234
Tertiary
129
Quaternary
124
Cenozoic
97
Paleozoic
96
Precambrian
76
Miocene
73
Eocene
68
Jurassic
61
Mesozoic
55
Pliocene
53
Pennsylvanian
52
Mississippian
49
Pleistocene
49
Devonian
47
Proterozoic
45
Ordovician
43
Permian
40
Holocene
38
Triassic
37
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