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
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 126973 collections

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International Chronostratigraphic Timescale			Cambrian of Kazakhstan	Devonian of Germany	Ordovician of China			Cambrian of North America		Cambrian of China		Devonian of Czechoslovakia
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	Ungurian		Xinchangian								477.7
		Tremadocian	Ungurian		Xinchangian		Lianghekou †						477.9 *
Cambrian	Furongian	Stage 10	Batyrbaian						Franconian †/Dresbachian/Millardan	Niuchehean	Taoyuanian †		485.4
		Stage 10						Sunwaptan		Niuchehean			487.5
		Jiangshanian								Jiangshanian			489.5
			Aksaian										490.7 *
			Sakian										492.2 *
								Steptoean					493 *
		Paibian								Paibian			494
		Paibian								Paibian	Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian	Ayusokkanian					Marjumian	Albertian †	Guzhangian	Wangcunian †		497
		Guzhangian								Guzhangian			499.5
		Drumian	Zhanaarykian							Drumian			500.5
		Drumian	Tuesaian							Drumian			503
		Wuliuan	Tuesaian					Topazan		Wuliuan/Taijangian			504.5
								Topazan					505.3
								Delamaran					506.5
	Series 2	Stage 4							Waucoban †	Duyunian			509
			Toyonian										510 *
			Toyonian					Dyeran					511 *
			Botomian										512.5 *
		Stage 3								Nangaoian			514
								Montezuman					514.8 *
			Atdabanian					Montezuman					515.6 *
			Atdabanian					Begadean					519.9 *
	Terreneuvian	Stage 2	Tommotian							Meishucunian			521
		Stage 2											525.5
		Fortunian											529
		Fortunian								Jinnigian			530.7
													538.8