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
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 126778 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of the Baltic				Ordovician of Australia
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Harju	Porkuni			Bolindian	443.8
		Katian		Rawtheyan				Pirgu				445.2
				Cautleyan								448.9 *
				Cautleyan							Eastonian	449 *
				Pusgillian								449.3 *
			Caradoc	Streffordian	Onnian †			Vormsi				449.6 *
								Nabala	Johvi †			450 *
							Viru	Rakvere				450.6 *
				Cheneyan				Rakvere				451.5 *
				Cheneyan				Oandu			Gisbornian	452 *
				Burrellian				Oandu				452.7 *
		Sandbian						Keila	Idavere †			453
					Actonian †			Keila				453.2 *
					Actonian †			Haljala				453.9
					Marshbrookian †	Woolstonian †						454.2 *
					Longvillian †							455.2 *
								Kukruse				456.4 *
				Aurelucian								456.8 *
					Soudleyan †/Harnagian/Costonian							457.4 *
					Soudleyan †/Harnagian/Costonian			Uhaku	Aluoja †			457.5 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Uhaku			Darriwilian	458.4
								Lasnamagi				458.9 *
								Aseri				460.4 *
				Abereiddian/Early Llanvirn				Aseri				461.3 *
							Oeland	Kunda				462.9 *
								Kunda	Valaste †/Hunderum			464.3 *
								Volkhov		Langevoja †/Vaana/Saka		467.1 *
		Dapingian									Yapeenian	467.3
			Arenig	Fennian							Yapeenian	468.4 *
											Castlemainian	468.5 *
								Billingen			Castlemainian	469.3 *
	Early Ordovician	Floian									Chewtonian	470
									Latorp †			470.1 *
				Whitlandian								471.1 *
											Bendigonian	471.8 *
											Lancefieldian	473.5 *
								Hunneberg				473.7 *
				Moridunian								474.3 *
		Tremadocian	Tremadoc	Migneintian								477.7
				Cressagian								480.8 *
								Varangu				481.3 *
								Pakerort				482.2 *
											Warendian	482.8 *
											Warendian	485 *
												485.4 *
												486.3
												486.5