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

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 128253 collections

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International Chronostratigraphic Timescale					Ordovician of Ibero-Bohemia				Cambrian of Britain		Obsolete Precambrian Ages		Permian of the Russian Platform		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	Kosovian												443.8
				Katian	Kralodvorian	Bohdalec †											445.2
				Katian	Berounian												449.7 *
				Sandbian													453
							Zahorany †/Vinice	Letna †									456.2 *
						Liben †											458 *
			Middle Ordovician	Darriwilian													458.4
					Dobrotivian												458.5 *
					Oretanian												459.7 *
						Sarka †											461.7 *
				Dapingian		Klabava †											467.3
				Dapingian	Arenigian												468
			Early Ordovician	Floian	Arenigian												470
			Early Ordovician	Tremadocian	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