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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126884 collections

Show more time

Show linear time

International Chronostratigraphic Timescale					Permian of the Russian Platform		Ordovician of Australia	Cambrian of North America		Obsolete Precambrian Ages		Devonian of Germany	Ordovician of China			Cambrian of China		Devonian of Czechoslovakia
Phanerozoic	Paleozoic	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								Wocklum/Dasberg/Hemberg/Nehden							358.9
			Late Devonian	Frasnian								Adorf							372.2
			Middle Devonian	Givetian								Givetian						Srbsko	382.7
			Middle Devonian	Eifelian								Eifelian						Chotec	387.7
			Early Devonian	Emsian								Emsian						Daleje/Zlichovian	393.3
				Pragian								Siegen						Pragian	407.6
				Lochkovian								Gedinnine						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			Bolindian						Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
				Katian			Bolindian						Chientangkiangian						445.2
							Eastonian						Chientangkiangian						449 *
							Eastonian						Neichianshanian/Hanjiang						449.5
							Gisbornian												452 *
				Sandbian			Gisbornian												453
			Middle Ordovician	Darriwilian			Darriwilian						Darriwilian	Guniu †/Hulo					458.4
				Darriwilian			Darriwilian						Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo				466.3 *
				Dapingian			Yapeenian						Dapingian						467.3
				Dapingian			Castlemainian						Dapingian						468.5 *
			Early Ordovician	Floian			Chewtonian						Yiyangian						470
							Bendigonian												471.8 *
							Lancefieldian												473.5 *
				Tremadocian									Xinchangian						477.7
															Lianghekou †				477.9 *
							Warendian								Lianghekou †				482.8 *
		Cambrian	Furongian	Stage 10					Franconian †/Dresbachian/Millardan							Niuchehean	Taoyuanian †		485.4
				Stage 10				Sunwaptan								Niuchehean			487.5
				Jiangshanian				Sunwaptan								Jiangshanian			489.5
				Jiangshanian				Steptoean								Jiangshanian			493 *
				Paibian												Paibian			494
				Paibian												Paibian	Waergangian †/Youshuanian		494.9 *
			Miaolingian	Guzhangian				Marjumian	Albertian †							Guzhangian	Wangcunian †		497
				Drumian				Marjumian								Drumian	Wangcunian †		500.5
				Wuliuan				Topazan								Wuliuan/Taijangian			504.5
				Wuliuan				Delamaran								Wuliuan/Taijangian			506.5
Series 2	Stage 4		Waucoban †	Duyunian				Delamaran	509
	Stage 4			Duyunian				Dyeran	511 *
	Stage 3			Nangaoian				Dyeran	514
								Montezuman	514.8 *
								Begadean	519.9 *
Terreneuvian	Stage 2			Meishucunian					521
	Fortunian			Meishucunian					529
	Fortunian			Jinnigian					530.7
Proterozoic	Neoproterozoic	Ediacaran								Vendian †	Poundian †								538.8
Proterozoic	Neoproterozoic	Ediacaran								Vendian †	Wonokan †								571.7 *
																			635