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

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 126844 collections

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International Chronostratigraphic Timescale			Devonian Subages	Silurian of the Baltic	Cambrian of Australia	Ordovician of Ibero-Bohemia				Obsolete Carboniferous Ages of China
Carboniferous	Pennsylvanian	Gzhelian								Mapingian †	298.9
		Kasimovian								Mapingian †	303.7
		Kasimovian									305.9
		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			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				Kosovian					443.8
		Katian				Kralodvorian	Bohdalec †				445.2
		Katian				Berounian					449.7 *
		Sandbian									453
								Zahorany †/Vinice	Letna †		456.2 *
							Liben †				458 *
	Middle Ordovician	Darriwilian									458.4
						Dobrotivian					458.5 *
						Oretanian					459.7 *
							Sarka †				461.7 *
		Dapingian					Klabava †				467.3
		Dapingian				Arenigian					468
	Early Ordovician	Floian				Arenigian					470
	Early Ordovician	Tremadocian				Tremadocian					477.7
Cambrian	Furongian	Stage 10			Datsonian						485.4
		Stage 10			Payntonian						486.8 *
		Jiangshanian			Iverian						489.5
		Paibian			Idamean						494
	Miaolingian	Guzhangian			Mindyallan						497
		Guzhangian			Boomerangian						499
		Drumian			Undillan						500.5
		Drumian			Floran						503
		Wuliuan			Templetonian						504.5
		Wuliuan			Ordian						507.8 *
	Series 2	Stage 4			Ordian						509
											510.8 *