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

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International Chronostratigraphic Timescale					Ordovician of Australia	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						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		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