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
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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

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 126700 collections

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International Chronostratigraphic Timescale			Ordovician of North America					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				Tremadocian				477.7
				Stairsian								480.3 *
				Skullrockian/Demingian								482 *
												485.4
												487.5