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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126762 collections

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International Chronostratigraphic Timescale			Cambrian of West Avalonia	Silurian Ages of Europe	Carboniferous Subepochs	Ordovician of Britain				Ordovician of Australia
Carboniferous	Pennsylvanian	Gzhelian			Late Pennsylvanian						298.9
		Kasimovian			Late Pennsylvanian						303.7
		Moscovian			Middle Pennsylvanian						307
		Bashkirian			Early Pennsylvanian						315.2
	Mississippian	Serpukhovian			Late Mississippian						323.2
		Visean			Middle Mississippian						330.9
		Tournaisian			Early Mississippian						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		Gleedonian							427.4
		Homerian		Whitwellian							429.7 *
		Sheinwoodian									430.5
	Llandovery	Telychian									433.4
		Aeronian									438.5
		Rhuddanian									440.8
Ordovician	Late Ordovician	Hirnantian				Ashgill	Hirnantian			Bolindian	443.8
		Katian					Rawtheyan				445.2
							Cautleyan				448.9 *
							Cautleyan			Eastonian	449 *
							Pusgillian				449.3 *
						Caradoc	Streffordian	Onnian †			449.6 *
							Cheneyan				451.5 *
							Cheneyan			Gisbornian	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				Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Darriwilian	458.4
		Darriwilian					Abereiddian/Early Llanvirn			Darriwilian	461.3 *
		Dapingian					Abereiddian/Early Llanvirn			Yapeenian	467.3
						Arenig	Fennian			Yapeenian	468.4 *
										Castlemainian	468.5 *
	Early Ordovician	Floian								Chewtonian	470
							Whitlandian			Chewtonian	471.1 *
										Bendigonian	471.8 *
										Lancefieldian	473.5 *
							Moridunian				474.3 *
		Tremadocian				Tremadoc	Migneintian				477.7
							Cressagian				480.8 *
							Cressagian			Warendian	482.8 *
										Warendian	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