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 126848 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Ibero-Bohemia				Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Kosovian				Harju	Porkuni			443.8
		Katian		Rawtheyan			Kralodvorian	Bohdalec †				Pirgu			445.2
				Cautleyan											448.9 *
				Pusgillian											449.3 *
			Caradoc	Streffordian	Onnian †							Vormsi			449.6 *
							Berounian					Vormsi			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 *
							Dobrotivian					Lasnamagi			458.9 *
							Oretanian					Lasnamagi			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