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
J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Bolindian	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 †							453
				Haljala								453.9
				Haljala						Zahorany †/Vinice	Letna †	456.2 *
				Kukruse								456.4 *
				Uhaku	Aluoja †							457.5 *
									Liben †			458 *
	Middle Ordovician	Darriwilian					Darriwilian					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		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				Tremadocian				477.7
				Varangu								481.3 *
				Pakerort								482.2 *
				Pakerort			Warendian					482.8 *
												485.4 *
												486.3
												486.5