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

Show more time

Show linear time

International Chronostratigraphic Timescale			Permian of the Salt Range	Devonian of France	Cambrian of West Avalonia	Permian of the Pamirs	Ordovician of Britain
Triassic	Early Triassic	Induan	Kathwai								251.5 *
Permian	Lopingian	Changhsingian	Kathwai			Dorashamian					251.902
											252.4 *
			Chhidru								252.9 *
		Wuchiapingian	Chhidru			Dzhulfian					254.14
			Kalabagh								255 *
			Wargal								256 *
	Guadalupian	Capitanian				Midian					259.51
		Wordian									264.28
											265.3 *
			Amb								266.1 *
						Murgabian					266.2 *
		Roadian									266.9
		Roadian									270.7 *
	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		Famennian							358.9
	Late Devonian	Frasnian		Frasnian							372.2
	Middle Devonian	Givetian		Givetian							382.7
	Middle Devonian	Eifelian		Couvinien							387.7
	Early Devonian	Emsian									393.3
		Pragian									407.6
		Pragian		Coblencien							408.2 *
		Lochkovian		Gedinnine							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					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
					Cressagian		Tremadoc	480.8 *
								485 *
Cambrian	Furongian	Stage 10						485.4
		Jiangshanian						489.5
		Paibian						494
	Miaolingian	Guzhangian						497
		Guzhangian						Arcadian			498.4
		Drumian									500.5
		Wuliuan									504.5
	Series 2	Stage 4						Branchian			509
		Stage 3						Branchian			514
		Stage 3						Placentian			517.1
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian	529
											538.8