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
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 127258 collections

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International Chronostratigraphic Timescale			Permian of the Salt Range	Devonian Subages	Ordovician of Australia	Ordovician of Britain
Triassic	Early Triassic	Induan	Kathwai							251.5 *
Permian	Lopingian	Changhsingian	Kathwai							251.902
										252.4 *
			Chhidru							252.9 *
		Wuchiapingian	Chhidru							254.14
			Kalabagh							255 *
			Wargal							256 *
	Guadalupian	Capitanian								259.51
		Wordian								264.28
										265.3 *
			Amb							266.1 *
		Roadian	Amb							266.9
		Roadian								270.7 *
	Cisuralian	Kungurian								273.01
		Artinskian								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		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			Bolindian	Ashgill	Hirnantian			443.8
		Katian					Rawtheyan			445.2
							Cautleyan			448.9 *
					Eastonian		Cautleyan			449 *
							Pusgillian			449.3 *
						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	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
		Darriwilian			Darriwilian		Abereiddian/Early Llanvirn			461.3 *
		Dapingian			Yapeenian		Abereiddian/Early Llanvirn			467.3
					Yapeenian	Arenig	Fennian			468.4 *
					Castlemainian					468.5 *
	Early Ordovician	Floian			Chewtonian					470
					Chewtonian		Whitlandian			471.1 *
					Bendigonian					471.8 *
					Lancefieldian					473.5 *
							Moridunian			474.3 *
		Tremadocian				Tremadoc	Migneintian			477.7
							Cressagian			480.8 *
			Warendian		482.8 *		Cressagian
			Warendian				485 *
										485.4