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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126848 collections

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International Chronostratigraphic Timescale					Carboniferous Subepochs	Precambrian of Russia	Ordovician of China			Devonian Subages	Ordovician of Ibero-Bohemia
Phanerozoic	Paleozoic	Carboniferous	Pennsylvanian	Gzhelian	Late Pennsylvanian										298.9
				Kasimovian	Late Pennsylvanian										303.7
				Moscovian	Middle Pennsylvanian										307
				Bashkirian	Early Pennsylvanian										315.2
			Mississippian	Serpukhovian	Late Mississippian										323.2
				Visean	Middle Mississippian										330.9
				Tournaisian	Early Mississippian										346.7
		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						Late Givetian					382.7
										Middle Givetian					383.7 *
										Early Givetian					385.9 *
				Eifelian						Late Eifelian					387.7
				Eifelian						Early Eifelian					390.3 *
			Early Devonian	Emsian						Late Emsian					393.3
				Emsian						Early Emsian					398.3 *
				Pragian						Pragian					407.6
				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