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Geologic Periods

Era
Period
Epoch
M Years Ago
Pre-Cambrian
Archean Eon
 
4,600
Proterozoic Eon
 
2,500
Paleozoic
Cambrian
 
590
Ordovician
 
505
Silurian
 
438
Devonian  
408
Carboniferous
Mississipian
360
Pennsylvanian
320
Permian  
286
Mesozoic
Triassic
 
248
Jurassic
 
213
Cretaceous
 
144
Cenozoic
Tertiary
Paleocene
65
Eocene
55
Oligocene
38
Miocene
25
Pliocene
5
Quaternary
Pleistocene
2
Holocene (Recent)
0.01

Sources

Dixon, D., B. Cox et al. The Macmillan Illustrated Encyclopedia of Dinosaurs & Prehistoric Animals. New York: Collier Books, 1992.

 

 

 

 

 

 

 

 




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