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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 127980 collections

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International Chronostratigraphic Timescale			Ordovician of North America					Ordovician of China			Permian of the Russian Platform
Permian	Lopingian	Wuchiapingian									Tatarian	Vyatkian	256.8 *
	Guadalupian	Capitanian										Severodvinian	259.51
		Wordian										Urzhumian	264.28
		Roadian									Kazanian	Povolzhian	266.9
		Roadian									Kazanian	Sokian	270.7 *
	Cisuralian	Kungurian									Kungurian	Irenian/Ufimian	273.01
												Filipovian	276.5 *
												Saraninian	280.1 *
		Artinskian									Artinskian	Sarginian	283.5
												Irginian	285.9 *
												Burtsevian	287.8 *
		Sakmarian									Sakmarian	Sterlitamakian	290.1
		Sakmarian									Sakmarian	Tastubian	291.7 *
		Asselian									Asselian	Shikhanian	293.52
												Uskalykian	294.8
												Surenian	297.5
Carboniferous	Pennsylvanian	Gzhelian											298.9
		Kasimovian											303.7
		Moscovian											307
		Bashkirian											315.2
	Mississippian	Serpukhovian											323.2
		Visean											330.9
		Tournaisian											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				Hirnantian	Xiaoxita †/Shikou	Wufeng †			443.8
		Katian		Gamachian				Chientangkiangian					445.2
				Richmondian				Chientangkiangian					446 *
				Richmondian				Neichianshanian/Hanjiang					449.5
				Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian								449.8 *
				Edenian									450.4 *
			Mohawkian	Chatfieldian									451.1 *
		Sandbian		Chatfieldian									453
				Turinian									453.7 *
			Whiterockian		Canadian †	Chazyan †/Marmor							457 *
	Middle Ordovician	Darriwilian						Darriwilian	Guniu †/Hulo				458.4
		Darriwilian						Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo			466.3 *
		Dapingian						Dapingian					467.3
		Dapingian		Rangerian				Dapingian					469.1 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	Yiyangian					470
		Floian		Tulean				Yiyangian					473.9 *
		Tremadocian						Xinchangian					477.7
										Lianghekou †			477.9 *
				Stairsian									480.3 *
				Skullrockian			Demingian †						482 *
Cambrian	Furongian	Stage 10		Skullrockian									485.4
													487.5