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
M. Harzhauser and W. E. Piller. 2004. Integrated stratigraphy of the Sarmatian (Upper Middle Miocene) in the western Central Paratethys. Stratigraphy 1(1):65-86 view
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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 127245 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Ibero-Bohemia				Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Kosovian				Ashgill	Hirnantian			443.8
		Katian		Pirgu			Kralodvorian	Bohdalec †				Rawtheyan			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					Tremadocian				Tremadoc	Migneintian			477.7
												Cressagian			480.8 *
				Varangu											481.3 *
				Pakerort											482.2 *
				Pakerort											485 *
															485.4 *
															486.3
															486.5