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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 view
M. Harzhauser and W. E. Piller. 2004. Integrated stratigraphy of the Sarmatian (Upper Middle Miocene) in the western Central Paratethys. Stratigraphy 1(1):65-86 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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 125968 collections

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International Chronostratigraphic Timescale			Ordovician of Australia	Ten Million Year Bins	Ordovician of the Baltic				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Bolindian	Ordovician 5	Harju	Porkuni			Kosovian				443.8
		Katian	Bolindian			Pirgu			Kralodvorian	Bohdalec †			445.2
			Eastonian			Pirgu							449 *
						Vormsi							449.6 *
						Vormsi			Berounian				449.7 *
						Nabala	Johvi †						450 *
					Viru	Rakvere							450.6 *
			Gisbornian			Oandu							452 *
		Sandbian		Ordovician 4		Keila	Idavere †						453
						Haljala							453.9
						Haljala					Zahorany †/Vinice	Letna †	456.2 *
						Kukruse							456.4 *
						Uhaku	Aluoja †						457.5 *
										Liben †			458 *
	Middle Ordovician	Darriwilian	Darriwilian	Ordovician 3									458.4
									Dobrotivian				458.5 *
						Lasnamagi			Dobrotivian				458.9 *
						Lasnamagi			Oretanian				459.7 *
						Aseri							460.4 *
						Aseri				Sarka †			461.7 *
					Oeland	Kunda							462.9 *
						Kunda	Valaste †/Hunderum						464.3 *
						Volkhov		Langevoja †/Vaana/Saka					467.1 *
		Dapingian	Yapeenian	Ordovician 2						Klabava †			467.3
			Yapeenian						Arenigian				468
			Castlemainian										468.5 *
			Castlemainian			Billingen							469.3 *
	Early Ordovician	Floian	Chewtonian										470
			Chewtonian				Latorp †						470.1 *
			Bendigonian										471.8 *
			Lancefieldian										473.5 *
						Hunneberg							473.7 *
		Tremadocian		Ordovician 1		Hunneberg			Tremadocian				477.7
						Varangu							481.3 *
						Pakerort							482.2 *
			Warendian			Pakerort							482.8 *
													485.4 *
													486.3
													486.5