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

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 126849 collections

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International Chronostratigraphic Timescale					Cambrian of Britain		Obsolete Precambrian Ages		Permian of the Russian Platform		Cambrian of West Avalonia	Silurian of the Baltic	Devonian of Germany
Phanerozoic	Paleozoic	Permian	Lopingian	Wuchiapingian					Tatarian	Vyatkian				256.8 *
			Guadalupian	Capitanian						Severodvinian				259.51
				Wordian						Urzhumian				264.28
				Roadian					Kazanian	Povolzhian				266.9
				Roadian					Kazanian	Sokian				270.7 *
			Cisuralian	Kungurian					Kungurian	Irenian/Ufimian				273.01
										Filipovian				276.5 *
										Saraninian				280.1 *
				Artinskian					Artinskian	Sarginian				283.5
										Irginian				285.9 *
										Burtsevian				287.8 *
				Sakmarian					Sakmarian	Sterlitamakian				290.1
				Sakmarian					Sakmarian	Tastubian				291.7 *
				Asselian					Asselian	Shikhanian				293.52
										Uskalykian				294.8
										Surenian				297.5
		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	382.7
			Middle Devonian	Eifelian									Eifelian	387.7
			Early Devonian	Emsian									Emsian	393.3
				Pragian									Siegen	407.6
				Lochkovian									Gedinnine	410.8
		Silurian	Pridoli									Ohesaare		419.2
			Pridoli									Kaugetuma		421.7 *
			Ludlow	Ludfordian								Kuressaare		423
				Ludfordian								Paadla		423.4 *
				Gorstian								Paadla		425.6
			Wenlock	Homerian								Rootsikula		427.4
				Homerian								Jaagarahu		429.2 *
				Sheinwoodian								Jaagarahu		430.5
				Sheinwoodian								Jaani		431.8 *
			Llandovery	Telychian								Jaani		433.4
				Telychian								Adavere		434 *
				Aeronian								Adavere		438.5
				Aeronian								Raikkula		439.4 *
				Rhuddanian								Raikkula		440.8
				Rhuddanian								Juuru		441.4 *
		Ordovician	Late Ordovician	Hirnantian										443.8
				Katian										445.2
				Sandbian										453
			Middle Ordovician	Darriwilian										458.4
			Middle Ordovician	Dapingian										467.3
			Early Ordovician	Floian										470
			Early Ordovician	Tremadocian										477.7
		Cambrian	Furongian	Stage 10	Merioneth	Dolgellian/Trempealeauan								485.4
				Stage 10		Festiniogian								489.2 *
				Jiangshanian		Festiniogian								489.5
				Jiangshanian		Maentwrogian								493.1 *
				Paibian		Maentwrogian								494
			Miaolingian	Guzhangian	St Davids									497
				Guzhangian							Arcadian			498.4
				Drumian										500.5
				Wuliuan										504.5
			Series 2	Stage 4	Caerfai						Branchian			509
				Stage 3							Branchian			514
				Stage 3							Placentian			517.1
Terreneuvian	Stage 2		521
Terreneuvian	Fortunian		529
Proterozoic	Neoproterozoic	Ediacaran					Vendian †	Poundian †						538.8
Proterozoic	Neoproterozoic	Ediacaran					Vendian †	Wonokan †						571.7 *
														635