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
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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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 126606 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of the Baltic				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Harju	Porkuni			Kosovian				443.8
		Katian		Rawtheyan				Pirgu			Kralodvorian	Bohdalec †			445.2
				Cautleyan											448.9 *
				Pusgillian											449.3 *
			Caradoc	Streffordian	Onnian †			Vormsi							449.6 *
								Vormsi			Berounian				449.7 *
								Nabala	Johvi †						450 *
							Viru	Rakvere							450.6 *
				Cheneyan				Rakvere							451.5 *
				Cheneyan				Oandu							452 *
				Burrellian				Oandu							452.7 *
		Sandbian						Keila	Idavere †						453
					Actonian †			Keila							453.2 *
					Actonian †			Haljala							453.9
					Marshbrookian †	Woolstonian †									454.2 *
					Longvillian †										455.2 *
													Zahorany †/Vinice	Letna †	456.2 *
								Kukruse							456.4 *
				Aurelucian											456.8 *
					Soudleyan †/Harnagian/Costonian										457.4 *
								Uhaku	Aluoja †						457.5 *
												Liben †			458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn											458.4
											Dobrotivian				458.5 *
								Lasnamagi			Dobrotivian				458.9 *
								Lasnamagi			Oretanian				459.7 *
								Aseri							460.4 *
				Abereiddian/Early Llanvirn											461.3 *
												Sarka †			461.7 *
							Oeland	Kunda							462.9 *
								Kunda	Valaste †/Hunderum						464.3 *
								Volkhov		Langevoja †/Vaana/Saka					467.1 *
		Dapingian										Klabava †			467.3
											Arenigian				468
			Arenig	Fennian											468.4 *
								Billingen							469.3 *
	Early Ordovician	Floian													470
									Latorp †						470.1 *
				Whitlandian											471.1 *
				Whitlandian				Hunneberg							473.7 *
				Moridunian											474.3 *
		Tremadocian	Tremadoc	Migneintian							Tremadocian				477.7
				Cressagian											480.8 *
								Varangu							481.3 *
								Pakerort							482.2 *
								Pakerort							485 *
															485.4 *
															486.3
															486.5