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Geologic Time Scale
Eon, Era, Period
23
Geology
Undergraduate 1
10/24/2011
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Cards

Term
Permian
 Definition
299 Ma - 251 Ma
Term
Cambrian
 Definition
542 Ma - 488 Ma
Term
Paleogene
 Definition
65.5 Ma - 23 Ma
Term
Tertiary
 Definition
65.5 Ma - 2.6 Ma
Term
Cenozoic
 Definition
65.5 Ma - Present
Term
Proterozoic
 Definition
2.5 Ga - 542 Ma
Term
Paleozoic
 Definition
542 Ma - 251 Ma
Term
Devonian
 Definition
416 Ma - 359 Ma
Term
Mississippian 
 Definition
359 Ma - 318 Ma
Term
Hadean
 Definition
4.6 Ga - 4.0 Ga
Term
Neogene
 Definition
23 Ma - 2.6 Ma
Term
Quarternary
 Definition
2.6 Ma - Present
Term
Phanerozoic
 Definition
542 Ma - Present
Term
Archean
 Definition
4.0 Ga - 2.5 Ga
Term
Cretaceous
 Definition
145.5 Ma - 65.5 Ma
Term
Triassic
 Definition
251 Ma - 201 Ma
Term
Ordovician
 Definition
488 Ma - 444 Ma
Term
Pennsylvanian
 Definition
318 Ma - 299 Ma
Term
Jurassic
 Definition
201 Ma - 145.5 Ma
Term
Carboniferous
 Definition
359 Ma - 299 Ma
Term
Mesozoic
 Definition
251 Ma - 65.5 Ma
Term
Silurian
 Definition
444 Ma - 416 Ma
Term
Precambrian
 Definition
4.6 Ga - 542 ma
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