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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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			Ordovician of China			Devonian of France	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				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	Hirnantian	Xiaoxita †/Shikou	Wufeng †		Kosovian					443.8
		Katian	Chientangkiangian		Wufeng †		Kralodvorian	Bohdalec †				445.2
			Neichianshanian/Hanjiang				Kralodvorian					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 *
				Hunjiang †	Dawan †/Daobaowan/Ningkuo			Sarka †				466.3 *
		Dapingian	Dapingian					Klabava †				467.3
		Dapingian	Dapingian				Arenigian					468
	Early Ordovician	Floian	Yiyangian				Arenigian					470
		Tremadocian	Xinchangian				Tremadocian					477.7
		Tremadocian	Xinchangian		Lianghekou †		Tremadocian					477.9 *
												485.4