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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 128152 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Cambrian of Kazakhstan	Devonian Subages	Ordovician of China			Carboniferous Subepochs
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						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	Kosovian						Hirnantian	Xiaoxita †/Shikou	Wufeng †		443.8
		Katian	Kralodvorian	Bohdalec †					Chientangkiangian		Wufeng †		445.2
			Kralodvorian						Neichianshanian/Hanjiang				449.5
			Berounian										449.7 *
		Sandbian											453
					Zahorany †/Vinice	Letna †							456.2 *
				Liben †									458 *
	Middle Ordovician	Darriwilian							Darriwilian	Guniu †/Hulo			458.4
			Dobrotivian										458.5 *
			Oretanian										459.7 *
				Sarka †									461.7 *
				Sarka †						Hunjiang †	Dawan †/Daobaowan/Ningkuo		466.3 *
		Dapingian		Klabava †					Dapingian				467.3
		Dapingian	Arenigian						Dapingian				468
	Early Ordovician	Floian	Arenigian						Yiyangian				470
		Tremadocian	Tremadocian				Ungurian		Xinchangian				477.7
		Tremadocian	Tremadocian				Ungurian		Xinchangian		Lianghekou †		477.9 *
Cambrian	Furongian	Stage 10					Batyrbaian						485.4
		Jiangshanian					Batyrbaian						489.5
							Aksaian						490.7 *
							Sakian						492.2 *
		Paibian					Sakian						494
	Miaolingian	Guzhangian					Ayusokkanian						497
		Guzhangian											499.5
		Drumian					Zhanaarykian						500.5
		Drumian					Tuesaian						503
		Wuliuan					Tuesaian						504.5
		Wuliuan											505.3
	Series 2	Stage 4											509
							Toyonian						510 *
							Botomian						512.5 *
		Stage 3					Botomian						514
		Stage 3					Atdabanian						515.6 *
	Terreneuvian	Stage 2					Tommotian						521
													525.5