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
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
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 127258 collections

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International Chronostratigraphic Timescale			Ordovician of China			Permian of Western Europe	Ordovician of Australia	Ordovician of Britain
Permian	Lopingian	Wuchiapingian				Zechstein						254.14
	Guadalupian	Capitanian				Rotliegendes						259.51
		Wordian										264.28
		Roadian										266.9
	Cisuralian	Kungurian										273.01
		Artinskian				Autunian						283.5
		Sakmarian										290.1
		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											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 †		Bolindian	Ashgill	Hirnantian			443.8
		Katian	Chientangkiangian						Rawtheyan			445.2
									Cautleyan			448.9 *
							Eastonian		Cautleyan			449 *
									Pusgillian			449.3 *
			Neichianshanian/Hanjiang						Pusgillian			449.5
								Caradoc	Streffordian	Onnian †		449.6 *
									Cheneyan			451.5 *
							Gisbornian		Cheneyan			452 *
									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	Darriwilian	Guniu †/Hulo			Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
				Guniu †/Hulo					Abereiddian/Early Llanvirn			461.3 *
				Hunjiang †	Dawan †/Daobaowan/Ningkuo							466.3 *
		Dapingian	Dapingian				Yapeenian					467.3
							Yapeenian	Arenig	Fennian			468.4 *
							Castlemainian					468.5 *
	Early Ordovician	Floian	Yiyangian				Chewtonian					470
							Chewtonian		Whitlandian			471.1 *
							Bendigonian					471.8 *
							Lancefieldian					473.5 *
									Moridunian			474.3 *
		Tremadocian	Xinchangian					Tremadoc	Migneintian			477.7
					Lianghekou †				Migneintian			477.9 *
									Cressagian			480.8 *
							Warendian		Cressagian			482.8 *
							Warendian					485 *
												485.4