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

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 126778 collections

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International Chronostratigraphic Timescale			Carboniferous of China	Devonian of Eastern North America		Devonian of France	Ordovician of China			Cambrian of North America
Carboniferous	Pennsylvanian	Gzhelian	Xiaodushanian									300 *
		Kasimovian	Xiaodushanian									303.7
		Kasimovian	Dalaun									305.8 *
		Moscovian										307
		Bashkirian										315.2
			Huashibanian									318.5 *
			Lousuan									321.2 *
	Mississippian	Serpukhovian	Dewunian									323.2
		Serpukhovian	Shangsian									330.8 *
		Visean	Shangsian									330.9
		Visean	Jiusian									335 *
		Tournaisian	Tangbagouan									346.7
Devonian	Late Devonian	Famennian		Conewangan/Conneautan/Canadaway		Famennian						358.9
	Late Devonian	Frasnian		West Fallsian/Sonyean		Frasnian						372.2
	Middle Devonian	Givetian		Geneseean/Taghanican/Tioughniogan	Cazenovian	Givetian						382.7
	Middle Devonian	Eifelian		Southwoodian	Cazenovian	Couvinien						387.7
	Early Devonian	Emsian		Sawkillian/Deer Parkian	Helderbergian							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 †			443.8
		Katian					Chientangkiangian		Wufeng †			445.2
		Katian					Neichianshanian/Hanjiang					449.5
		Sandbian					Neichianshanian/Hanjiang					453
	Middle Ordovician	Darriwilian					Darriwilian	Guniu †/Hulo				458.4
		Darriwilian					Darriwilian	Hunjiang †	Dawan †/Daobaowan/Ningkuo			466.3 *
		Dapingian					Dapingian					467.3
	Early Ordovician	Floian					Yiyangian					470
		Tremadocian					Xinchangian					477.7
		Tremadocian					Xinchangian		Lianghekou †			477.9 *
Cambrian	Furongian	Stage 10									Franconian †/Dresbachian/Millardan	485.4
		Stage 10								Sunwaptan		487.5
		Jiangshanian								Sunwaptan		489.5
		Jiangshanian								Steptoean		493 *
		Paibian								Steptoean		494
	Miaolingian	Guzhangian								Marjumian	Albertian †	497
		Drumian								Marjumian		500.5
		Wuliuan								Topazan		504.5
		Wuliuan								Delamaran		506.5
	Series 2	Stage 4								Delamaran	Waucoban †	509
		Stage 4								Dyeran		511 *
		Stage 3								Dyeran		514
										Montezuman		514.8 *
										Begadean		519.9 *
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
												538.8