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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
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			Ten Million Year Bins	Ordovician of the Baltic				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Ordovician 5	Harju	Porkuni			Kosovian				443.8
		Katian			Pirgu			Kralodvorian	Bohdalec †			445.2
					Vormsi			Kralodvorian				449.6 *
					Vormsi			Berounian				449.7 *
					Nabala	Johvi †						450 *
				Viru	Rakvere							450.6 *
					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	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	Ordovician 2						Klabava †			467.3
								Arenigian				468
					Billingen							469.3 *
	Early Ordovician	Floian										470
						Latorp †						470.1 *
					Hunneberg							473.7 *
		Tremadocian	Ordovician 1		Hunneberg			Tremadocian				477.7
					Varangu							481.3 *
					Pakerort							482.2 *
												485.4 *
												486.3
												486.5