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Geologic Time Scale Dates
Time Scale Dates
13
Geology
Undergraduate 2
01/30/2012
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Term
2500 Ma
 Definition
Proterozoic
Term
542-488
 Definition
Cambrian
Term
488-444
 Definition
Ordovician
Term
444-416
 Definition
Silurian
Term
416-359
 Definition
Devonian
Term
359-318
 Definition
Carboniferous - Mississippian
Term
318-299
 Definition
Carboniferous - Pennsylvanian
Term
299-251
 Definition
Permian
Term
251-200
 Definition
Triassic
Term
200-145
 Definition
Jurassic
Term
145-65.5
 Definition
Cretaceous
Term
65.5-23.03
 Definition
Paleogene
Term
23.03-Today
 Definition
Neogene
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