Geologic Time Scale

GEOLOGIC TIME SCALE
Eon	Era	Period		Epoch	Date
Phanerozoic	Cenozoic	Quaternary		Holocene	11,700 - Present
		Quaternary		Pleistocene	2.59 m.y. - 11,700 yrs
		Neogene		Pliocene	5.33 - 2.59 m.y.
		Neogene		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.
		Carboniferous	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).