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Geologic time scale
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EON ERA EPOCH PERIOD MILLIONS
OF YEARS
AGO
Phanerozoic Cenozoic Quaternary Holocene 0.01
Pleistocene 2
Tertiary Pilocene 5
Miocene 24
Oligocene 37
Eocene 58
Paleocene 66
Mesozoic Cretaceous 144
Jurassic 208
Triassic 245
Paleozoic Permian 286
Pennsylvanian 320
Mississippian 360
Devonian 408
Silurian 438
Ordovician 505
Cambrian 570
Proterozoic Precambrian 2500
Archean 4600

Ed resources
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Birthstones

Geologic time scale

Geology museums

Glossary of terms

Mineral identification

MOHS hardness scale

US National Parks

US State Fossils

US State Gems/Minerals

US State Parks


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© 1998-2014 Memphis Archaeological and Geological Society. This page last updated 10.30.14.