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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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 127017 collections

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International Chronostratigraphic Timescale					Devonian of Eastern North America		Cambrian of North America		Obsolete Precambrian Ages		Devonian of Germany	Ordovician of China			Cambrian of China		Devonian of Czechoslovakia
Phanerozoic	Paleozoic	Devonian	Late Devonian	Famennian	Conewangan/Conneautan/Canadaway						Wocklum/Dasberg/Hemberg/Nehden							358.9
			Late Devonian	Frasnian	West Fallsian/Sonyean						Adorf							372.2
			Middle Devonian	Givetian	Geneseean/Taghanican/Tioughniogan	Cazenovian					Givetian						Srbsko	382.7
			Middle Devonian	Eifelian	Southwoodian	Cazenovian					Eifelian						Chotec	387.7
			Early Devonian	Emsian	Sawkillian/Deer Parkian	Helderbergian					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								Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
				Katian								Chientangkiangian		Wufeng †				445.2
				Katian								Neichianshanian/Hanjiang						449.5
				Sandbian								Neichianshanian/Hanjiang						453
			Middle Ordovician	Darriwilian								Darriwilian	Guniu †/Hulo					458.4
				Darriwilian								Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo				466.3 *
				Dapingian								Dapingian						467.3
			Early Ordovician	Floian								Yiyangian						470
				Tremadocian								Xinchangian						477.7
				Tremadocian								Xinchangian		Lianghekou †				477.9 *
		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			Delamaran	Waucoban †							Duyunian			509
				Stage 4			Dyeran								Duyunian			511 *
				Stage 3			Dyeran								Nangaoian			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