Geologic Time Scale


GEOLOGIC TIME SCALE
Eon Era Period Epoch Date
Phanerozoic Cenozoic Quaternary Holocene 11,700 - Present
Pleistocene 2.59 m.y. - 11,700 yrs
Neogene Pliocene 5.33 - 2.59 m.y.
Miocene 23 - 5.33 m.y.
Paleogene Oligocene 33.9 - 23 m.y.
Eocene 55.8 - 33.9 m.y.
Paleocene 65.5 - 55.8 m.y.
Mesozoic Cretaceous 146 - 65.5 m.y.
Jurassic 200 - 146 m.y.
Triassic 251 - 200 m.y.
Paleozoic Permian 299 - 251 m.y.
Carboniferous Pennsylvanian 318 - 299 m.y.
Mississippian 359 - 318 m.y.
Devonian 416 - 359 m.y.
Silurian 444 - 416 m.y.
Ordovician 488 - 444 m.y.
Cambrian 542 - 488 m.y.
Proterozoic Neoproterozoic Ediacaran 635 - 542 m.y.
Cryogenian 850 - 635 m.y.
Tonian 1.0 b.y - 850 m.y.
Mesoproterozoic Stenian 1.2 - 1.0 b.y.
Ectasian 1.4 - 1.2 b.y.
Calymmian 1.6 - 1.4 b.y.
Paleoproterozoic Statherian 1.8 - 1.6 b.y.
Orosirian 2.1 - 1.8 b.y.
Rhyacian 2.3 - 2.1 b.y.
Siderian 2.5 - 2.3 b.y.
Archean Neoarchean 2.8 - 2.5 b.y.
Mesoarchean 3.2 - 2.8 b.y.
Paleoarchean 3.6 - 3.2 b.y.
Eoarchean 4.0 - 3.6 b.y.
Hadean 4.6 - 4.0 b.y.

m.y. - million years
b.y. - billion years

Additional information may be obtained at: International Commission on Stratigraphy (ICS).

A full, detailed geologic time scale chart may be viewed in the ICS International Stratigraphic Chart (PDF file).