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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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
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 126710 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Britain				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Ashgill	Hirnantian			Kosovian				443.8
		Katian		Pirgu				Rawtheyan			Kralodvorian	Bohdalec †			445.2
								Cautleyan							448.9 *
								Pusgillian							449.3 *
				Vormsi			Caradoc	Streffordian	Onnian †						449.6 *
				Vormsi							Berounian				449.7 *
				Nabala	Johvi †										450 *
			Viru	Rakvere											450.6 *
				Rakvere				Cheneyan							451.5 *
				Oandu				Cheneyan							452 *
				Oandu				Burrellian							452.7 *
		Sandbian		Keila	Idavere †										453
				Keila					Actonian †						453.2 *
				Haljala					Actonian †						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 *
				Hunneberg				Whitlandian							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