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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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					Permian Subages of Germany	Obsolete Precambrian Ages		Devonian of Germany	Ordovician of China			Cambrian of North America		Cambrian of China		Devonian of Czechoslovakia
Phanerozoic	Paleozoic	Permian	Lopingian	Changhsingian	Buntsandstein												251.902
			Lopingian	Wuchiapingian	Buntsandstein												254.14
			Guadalupian	Capitanian	Ohre/Aller												259.51
				Wordian	Leine												264.28
				Roadian													266.9
			Cisuralian	Kungurian													273.01
				Artinskian													283.5
				Sakmarian													290.1
				Asselian													293.52
		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					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