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 128152 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian of Kazakhstan	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	Ungurian	Xinchangian				Tremadocian					477.7
		Tremadocian	Ungurian	Xinchangian		Lianghekou †		Tremadocian					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