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Subject (Era)
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Cretaceous
89
Quaternary
49
Cenozoic
41
Tertiary
39
Paleozoic
33
Pliocene
27
Holocene
24
Mesozoic
21
Precambrian
20
Miocene
19
Pleistocene
16
Permian
14
Jurassic
13
Eocene
12
Proterozoic
11
Neogene
9
Pennsylvanian
9
Mississippian
8
Oligocene
8
Paleocene
8