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

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 126844 collections

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International Chronostratigraphic Timescale					Devonian of Czechoslovakia	Precambrian of Russia	Ordovician of China			Devonian Subages	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Devonian	Late Devonian	Famennian						Late Famennian					358.9
										Middle Famennian					365.3 *
										Early Famennian					368.5 *
				Frasnian						Late Frasnian					372.2
										Middle Frasnian					375.4 *
										Early Frasnian					379.3 *
			Middle Devonian	Givetian	Srbsko					Late Givetian					382.7
										Middle Givetian					383.7 *
										Early Givetian					385.9 *
				Eifelian	Chotec					Late Eifelian					387.7
				Eifelian	Chotec					Early Eifelian					390.3 *
			Early Devonian	Emsian	Daleje/Zlichovian					Late Emsian					393.3
				Emsian	Daleje/Zlichovian					Early Emsian					398.3 *
				Pragian	Pragian					Pragian					407.6
				Lochkovian	Lochkovian					Late Lochkovian					410.8
										Middle Lochkovian					412.8 *
										Early Lochkovian					415.6 *
		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 †		Kosovian				443.8
				Katian			Chientangkiangian		Wufeng †		Kralodvorian	Bohdalec †			445.2
							Neichianshanian/Hanjiang				Kralodvorian				449.5
											Berounian				449.7 *
				Sandbian											453
													Zahorany †/Vinice	Letna †	456.2 *
												Liben †			458 *
			Middle Ordovician	Darriwilian			Darriwilian	Guniu †/Hulo							458.4
											Dobrotivian				458.5 *
											Oretanian				459.7 *
												Sarka †			461.7 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo			Sarka †			466.3 *
				Dapingian			Dapingian					Klabava †			467.3
				Dapingian			Dapingian				Arenigian				468
			Early Ordovician	Floian			Yiyangian				Arenigian				470
				Tremadocian			Xinchangian				Tremadocian				477.7
				Tremadocian			Xinchangian		Lianghekou †		Tremadocian				477.9 *
		Cambrian	Furongian	Stage 10											485.4
				Jiangshanian											489.5
				Paibian											494
			Miaolingian	Guzhangian											497
				Drumian											500.5
				Wuliuan											504.5
			Series 2	Stage 4											509
			Series 2	Stage 3											514
			Terreneuvian	Stage 2											521
			Terreneuvian	Fortunian											529
Proterozoic	Neoproterozoic	Ediacaran				Vendian									538.8
		Cryogenian													635
		Tonian													720
		Tonian				Karatau									800
	Mesoproterozoic	Stenian				Karatau									1000
		Stenian				Yurmatian									1100
		Ectasian				Yurmatian									1200
		Ectasian				Burzyan									1375
															1400