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Geologic Ages

Eon

Era

Period

Epoch

MYA

Phanerozoic

Cenozoic

Quaternary

Holocene

 now

Pleistocene

 .08

Tertiary

 

 Neogene

 Pliocene

 1.8

 Miocene

 5.3

 

 Paleogene

 

 Oligocene

 23.8

 Eocene

 33.7

 Paleocene

 55.5

Mesozoic

Cretaceous

 65

Jurassic

 145

Triassic

 213

Paleozoic

Permian

 248

Carboniferous

Pennsylvanian

 286

Mississippian

 325

Devonian

 360

Silurian

 410

Ordovician

 440

Cambrian

 505

 Proterozoic

Precambrian

 544

 Archean

 2500

 Hadean

 3800


A Mnemonic, uses Recent instead of Holocene as in the table above

The first letter of each word is the first letter of the
geological time periods, oldest to the present:

Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Recent.