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. 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
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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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			Cambrian of Siberia	Ordovician of China			Ordovician of Ibero-Bohemia				Ordovician of North America
Ordovician	Late Ordovician	Hirnantian		Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian				Cincinnatian	Gamachian				443.8
		Katian		Chientangkiangian			Kralodvorian	Bohdalec †				Gamachian				445.2
				Chientangkiangian								Richmondian				446 *
				Neichianshanian/Hanjiang												449.5
							Berounian									449.7 *
												Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
												Edenian				450.4 *
											Mohawkian	Chatfieldian				451.1 *
		Sandbian										Chatfieldian				453
												Turinian				453.7 *
									Zahorany †/Vinice	Letna †		Turinian				456.2 *
									Zahorany †/Vinice		Whiterockian		Canadian †	Chazyan †/Marmor		457 *
								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
							Arenigian									468
												Rangerian				469.1 *
	Early Ordovician	Floian		Yiyangian							Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian		Yiyangian								Tulean				473.9 *
		Tremadocian		Xinchangian			Tremadocian									477.7
						Lianghekou †										477.9 *
												Stairsian				480.3 *
												Skullrockian/Demingian				482 *
			Mansian †									Skullrockian/Demingian				483.55 *
																485.4
																487.5