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Subject (Era)
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Cretaceous
62
Quaternary
55
Paleozoic
25
Cenozoic
22
Jurassic
20
Precambrian
20
Tertiary
20
Eocene
18
From 65 to 140 million years ago
13
Ordovician
12
Paleocene
12
Cambrian
11
Pennsylvanian
11
Mesozoic
10
Pre-Quaternary
10
Devonian
8
From 230 to 570 million years ago
8
From 2 to 65 million years ago
7
From 2 million years ago
6
From 65 million years ago
6
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