PBDB Interval

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. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) 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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126650 collections

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International Chronostratigraphic Timescale			Ordovician of China			Cambrian of Siberia	Ten Million Year Bins	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †		Ordovician 5	Kosovian				443.8
		Katian	Chientangkiangian		Wufeng †			Kralodvorian	Bohdalec †			445.2
			Neichianshanian/Hanjiang					Kralodvorian				449.5
								Berounian				449.7 *
		Sandbian					Ordovician 4					453
										Zahorany †/Vinice	Letna †	456.2 *
									Liben †			458 *
	Middle Ordovician	Darriwilian	Darriwilian	Guniu †/Hulo			Ordovician 3					458.4
								Dobrotivian				458.5 *
								Oretanian				459.7 *
									Sarka †			461.7 *
				Hunjiang †	Dawan †/Daobaowan/Ningkuo				Sarka †			466.3 *
		Dapingian	Dapingian				Ordovician 2		Klabava †			467.3
		Dapingian	Dapingian					Arenigian				468
	Early Ordovician	Floian	Yiyangian					Arenigian				470
		Tremadocian	Xinchangian				Ordovician 1	Tremadocian				477.7
					Lianghekou †							477.9 *
					Lianghekou †	Mansian †						483.55 *
												485.4