Geologic Time Scale

Entire Page Is The PHANEROZOIC EON

Click here for the Hadean, Archean and Proterozoic Eons

PHANEROZOIC EON   PALEOZOIC ERA   Cambrian, Ordovician & Silurian Periods
EON PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC  PHANEROZOIC 
ERA Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic Paleozoic
PERIOD Cambrian Cambrian Cambrian Cambrian Ordovician Ordovician Ordovician Silurian Silurian Silurian Silurian
EPOCH Terreneuvian Series 2 Series 3 Furongian Early Middle Late Llandovery/
Alexandrian		 Wenlock Ludlow/
Cayugan		 Pridoli
YEARS 542 - 521 mya 521 - 510 mya 510 - 499 mya 499 - 488.3 mya 488.3-471.8 mya 471.8-460.9 mya 460.9-443.7 mya 443.7-428.2 mya 428.2-422.9 mya 422.9-418.7 mya 418.7 - 416 mya

PHANEROZOIC EON   PALEOZOIC ERA   Devonian, Carboniferous & Permian Periods
EON PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC
ERA Paleozoic Paleozoic   Paleozoic   Paleozoic     Paleozoic     Paleozoic     Paleozoic     Paleozoic    
PERIOD Devonian Devonian Devonian Carboniferous Carboniferous Permian Permian Permian
EPOCH Early    Middle   Late    Mississippian Pennsylvanian Cisuralian  Guadalupian Lopingian 
YEARS 416 - 397.5 mya 397.5 - 385.3 mya 385.3 - 359.2 mya 359.2 - 318.1 mya 318.1 - 299 mya 299 - 270.6 mya 270.6 - 260.4 mya 260.4 - 251 mya

PHANEROZOIC EON   MESOZOIC ERA   Triassic, Jurassic & Cretaceous Periods
EON PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC
ERA Mesozoic     Mesozoic     Mesozoic     Mesozoic     Mesozoic     Mesozoic     Mesozoic     Mesozoic    
PERIOD Triassic Triassic Triassic Jurassic Jurassic Jurassic Cretaceous Cretaceous
EPOCH Early    Middle   Late    Early    Middle   Late    Early Late   
YEARS 251 - 245.9 mya 245.9 - 228.7 mya 228.7 - 199.6 mya 199.6 - 175.6 mya 175.6 - 161.2 mya 161.2 - 145.5 mya 145.5 - 99.6 mya 99.6 - 65.5 mya

PHANEROZOIC EON   CENOZOIC ERA   Paleogene, Neogene (or Tertiary) & Quaternary Periods
  EON PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC PHANEROZOIC
  ERA Cenozoic Cenozoic Cenozoic Cenozoic Cenozoic Cenozoic Cenozoic
  PERIOD Paleogene Paleogene Paleogene Neogene (Tertiary) Neogene (Tertiary) Quaternary Quaternary
  EPOCH Paleocene Eocene  Oligocene Miocene  Pliocene  Pleistocene Holocene
  YEARS 65.5 - 55.8 mya 55.8 - 33.9 mya 33.9 - 23.03 mya 23.03 - 5.332 mya 5.332 - 2.588 mya 2.588 mya to 11,700 11,700 to today
"mya" means millions of years ago

The Earth's geological ages are classified as follows:

4 eons, each of which lasts approximately a billion years.
10 eras, each lasting about several hundred million years.
22 periods, which last about a hundred million years each. Only the proterozoic and the phanerozoic eons are divided into periods.
34 epochs, each lasting tens of millions of years. Only the phanerozoic eon is divided into epochs.


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