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Quaternary
44
Precambrian
25
Cenozoic
16
Paleozoic
15
Jurassic
13
Cretaceous
12
Pleistocene
12
Carboniferous
11
Devonian
11
Cambrian
10
Permian
10
Pliocene
10
Tertiary
10
Mesozoic
9
Miocene
9
Silurian
9
Triassic
7
Ordovician
5
1917-1945
4
862-1237
4
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