PBDB Timescale

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 view
W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view

There are 59 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 128370 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of North America					Ordovician of Ibero-Bohemia				Carboniferous of China
Carboniferous	Pennsylvanian	Gzhelian										Xiaodushanian	300 *
		Kasimovian										Xiaodushanian	303.7
		Kasimovian										Dalaun	305.8 *
		Moscovian											307
		Bashkirian											315.2
												Huashibanian	318.5 *
												Lousuan	321.2 *
	Mississippian	Serpukhovian										Dewunian	323.2
		Serpukhovian										Shangsian	330.8 *
		Visean										Shangsian	330.9
		Visean										Jiusian	335 *
		Tournaisian										Tangbagouan	346.7
Devonian	Late Devonian	Famennian											358.9
	Late Devonian	Frasnian											372.2
	Middle Devonian	Givetian											382.7
	Middle Devonian	Eifelian											387.7
	Early Devonian	Emsian											393.3
		Pragian											407.6
		Lochkovian											410.8
Silurian	Pridoli												419.2
	Ludlow	Ludfordian											423
	Ludlow	Gorstian											425.6
	Wenlock	Homerian											427.4
	Wenlock	Sheinwoodian											430.5
	Llandovery	Telychian											433.4
		Aeronian											438.5
		Rhuddanian											440.8
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian				Kosovian					443.8
		Katian		Gamachian				Kralodvorian	Bohdalec †				445.2
				Richmondian				Kralodvorian					446 *
				Richmondian				Berounian					449.7 *
				Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian								449.8 *
				Edenian									450.4 *
			Mohawkian	Chatfieldian									451.1 *
		Sandbian		Chatfieldian									453
				Turinian									453.7 *
				Turinian						Zahorany †/Vinice	Letna †		456.2 *
			Whiterockian		Canadian †	Chazyan †/Marmor				Zahorany †/Vinice			457 *
									Liben †				458 *
	Middle Ordovician	Darriwilian											458.4
								Dobrotivian					458.5 *
								Oretanian					459.7 *
									Sarka †				461.7 *
		Dapingian							Klabava †				467.3
								Arenigian					468
				Rangerian									469.1 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †						470
		Floian		Tulean									473.9 *
		Tremadocian		Tulean				Tremadocian					477.7
				Stairsian									480.3 *
				Skullrockian			Demingian †						482 *
Cambrian	Furongian	Stage 10		Skullrockian									485.4
													487.5