PBDB Interval

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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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

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 127393 collections

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International Chronostratigraphic Timescale			Permo-Triassic Subages of Eastern Europe	Silurian of the Baltic	Permian of the Pamirs	Ordovician of Britain
Triassic	Early Triassic	Olenekian	Vokhmian							247.2
Triassic	Early Triassic	Induan	Vokhmian							251.2
Permian	Lopingian	Changhsingian			Dorashamian					251.902
	Lopingian	Wuchiapingian	Late Vyatkian/Early Vyatkian		Dzhulfian					254.14
	Guadalupian	Capitanian	Late Severodvinian/Early Severodvinian		Midian					259.51
		Wordian	Late Urzhumian/Early Urzhumian		Midian					264.28
		Wordian	Late Urzhumian/Early Urzhumian		Murgabian					266.2 *
		Roadian	Late Kazanian/Early Kazanian		Murgabian					266.9
	Cisuralian	Kungurian			Kubergandian					273.01
		Kungurian			Bolorian					279.8
		Artinskian			Bolorian					283.5
		Artinskian			Yakhtashian					286
		Sakmarian			Sakmarian					290.1
		Asselian			Asselian					293.52
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								358.9
	Late Devonian	Frasnian								372.2
	Middle Devonian	Givetian								382.7
	Middle Devonian	Eifelian								387.7
	Early Devonian	Emsian								393.3
		Pragian								407.6
		Lochkovian								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				Ashgill	Hirnantian			443.8
		Katian					Rawtheyan			445.2
							Cautleyan			448.9 *
							Pusgillian			449.3 *
						Caradoc	Streffordian	Onnian †		449.6 *
							Cheneyan			451.5 *
							Burrellian			452.7 *
		Sandbian								453
								Actonian †		453.2 *
								Marshbrookian †	Woolstonian †	454.2 *
								Longvillian †		455.2 *
							Aurelucian	Longvillian †		456.8 *
							Aurelucian	Soudleyan †/Harnagian/Costonian		457.4 *
	Middle Ordovician	Darriwilian				Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian					Abereiddian/Early Llanvirn			461.3 *
		Dapingian					Abereiddian/Early Llanvirn			467.3
		Dapingian				Arenig	Fennian			468.4 *
	Early Ordovician	Floian					Fennian			470
							Whitlandian			471.1 *
							Moridunian			474.3 *
		Tremadocian				Tremadoc	Migneintian			477.7
		Tremadocian				Tremadoc	Cressagian			480.8 *
										485 *