Timeline: Geologic Eras

ERA PERIOD EPOCH

CENOZOIC (65.5 million years ago to present)

Neogene (23 million years ago to the present) Holocene (11,500 years ago to present)
    Pleistocene (1.8 million years ago to 11,500 years ago)
    Pliocene (5.3-1.8 million years ago)
    Miocene (23-5.3 million years ago)
  Paleogene (65.5-23 million years ago) Oligocene (33.9-23 million years ago)
    Eocene (55.8-33.9 million years ago)
    Paleocene (65.5-55.8 million years ago)
MESOZOIC (251-65.5 million years ago) Cretaceous (145.5-65.5 million years ago)  
  Jurassic (200-145.5 million years ago)  
  Triassic (251-200 million years ago)  
PALEOZOIC (542-251 million years ago) Permian (299-251 milion years ago)  
  Pennsylvanian (318-299 million years ago)  
  Mississippian (359-318 million years ago)  
  Devonian (416-359 million years ago)  
  Silurian (444-416 million years ago)  
  Ordovician (488-444 million years ago)  
  Cambrian (542-488 million years ago)  
PRECAMBRIAN (undefined to 542 million years ago) Proterozoic (2,500-542 million years ago)  
  Archean (undefined to 2,500 million years ago)  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Source: Pamela J. W. Gore, Georgia State University Perimeter College

 
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Courtesy of Hargrett Rare Book and Manuscript Library, University of Georgia Libraries