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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 127017 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ten Million Year Bins	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Kosovian				Ordovician 5	Cincinnatian	Gamachian				443.8
		Katian	Kralodvorian	Bohdalec †					Gamachian				445.2
			Kralodvorian						Richmondian				446 *
			Berounian						Richmondian				449.7 *
									Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
									Edenian				450.4 *
								Mohawkian	Chatfieldian				451.1 *
		Sandbian					Ordovician 4		Chatfieldian				453
									Turinian				453.7 *
					Zahorany †/Vinice	Letna †			Turinian				456.2 *
					Zahorany †/Vinice			Whiterockian		Canadian †	Chazyan †/Marmor		457 *
				Liben †									458 *
	Middle Ordovician	Darriwilian					Ordovician 3						458.4
			Dobrotivian										458.5 *
			Oretanian										459.7 *
				Sarka †									461.7 *
		Dapingian		Klabava †			Ordovician 2						467.3
			Arenigian										468
									Rangerian				469.1 *
	Early Ordovician	Floian						Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian							Tulean				473.9 *
		Tremadocian	Tremadocian				Ordovician 1		Tulean				477.7
									Stairsian				480.3 *
									Skullrockian/Demingian				482 *
													485.4
													487.5