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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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 126679 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Australia	Ten Million Year Bins	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Bolindian	Ordovician 5	Kosovian				443.8
		Katian		Pirgu			Bolindian		Kralodvorian	Bohdalec †			445.2
				Pirgu			Eastonian						449 *
				Vormsi									449.6 *
				Vormsi					Berounian				449.7 *
				Nabala	Johvi †								450 *
			Viru	Rakvere									450.6 *
				Oandu			Gisbornian						452 *
		Sandbian		Keila	Idavere †			Ordovician 4					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 *
				Billingen			Castlemainian						469.3 *
	Early Ordovician	Floian					Chewtonian						470
					Latorp †		Chewtonian						470.1 *
							Bendigonian						471.8 *
							Lancefieldian						473.5 *
				Hunneberg									473.7 *
		Tremadocian		Hunneberg				Ordovician 1	Tremadocian				477.7
				Varangu									481.3 *
				Pakerort									482.2 *
				Pakerort			Warendian						482.8 *
													485.4 *
													486.3
													486.5