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
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
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					Cambrian of Britain		Permian of China	Cambrian of North America		Obsolete Precambrian Ages		Devonian of Germany	Ordovician of China			Cambrian of China		Devonian of Czechoslovakia
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian			Meishanian												251.902
				Changhsingian			Baoqingian												253.4 *
				Wuchiapingian			Laoshanian												254.14
				Wuchiapingian			Laibinian												257.7 *
			Guadalupian	Capitanian			Lengwuan												259.51
				Wordian			Kuhfengian												264.28
				Roadian			Kuhfengian												266.9
			Cisuralian	Kungurian			Luodianian												273.01
				Artinskian			Luodianian												283.5
				Artinskian			Longlinian												285.4 *
				Sakmarian			Longlinian												290.1
				Asselian			Zisongian												293.52
		Carboniferous	Pennsylvanian	Gzhelian			Zisongian												298.9
				Gzhelian															300.1
				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									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	Merioneth	Dolgellian/Trempealeauan			Franconian †/Dresbachian/Millardan							Niuchehean	Taoyuanian †		485.4
						Dolgellian/Trempealeauan		Sunwaptan											487.5
						Festiniogian													489.2 *
				Jiangshanian												Jiangshanian			489.5
								Steptoean											493 *
						Maentwrogian													493.1 *
				Paibian												Paibian			494
				Paibian												Paibian	Waergangian †/Youshuanian		494.9 *
			Miaolingian	Guzhangian	St Davids			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	Caerfai			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
Jinnigian	530.7			Fortunian
Proterozoic	Neoproterozoic	Ediacaran								Vendian †	Poundian †								538.8
Proterozoic	Neoproterozoic	Ediacaran								Vendian †	Wonokan †								571.7 *
																			635