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
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
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
P. L. Gibbard, M. J. Head, and M. J. C. Walker. 2010. Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma. Journal of Quaternary Science 25(2):96-102 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 126586 collections

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International Chronostratigraphic Timescale			Ordovician of North America					Cambrian of Kazakhstan	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian					Kosovian				443.8
		Katian		Gamachian					Kralodvorian	Bohdalec †			445.2
				Richmondian					Kralodvorian				446 *
				Richmondian					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 *
				Turinian							Zahorany †/Vinice	Letna †	456.2 *
			Whiterockian		Canadian †	Chazyan †/Marmor					Zahorany †/Vinice		457 *
										Liben †			458 *
	Middle Ordovician	Darriwilian											458.4
									Dobrotivian				458.5 *
									Oretanian				459.7 *
										Sarka †			461.7 *
		Dapingian								Klabava †			467.3
									Arenigian				468
				Rangerian									469.1 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †						470
		Floian		Tulean									473.9 *
		Tremadocian		Tulean				Ungurian	Tremadocian				477.7
				Stairsian									480.3 *
				Skullrockian/Demingian									482 *
													485.4
													487.5