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

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 126585 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Ibero-Bohemia				Ordovician of China
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Kosovian				Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian		Pirgu			Kralodvorian	Bohdalec †			Chientangkiangian		Wufeng †	445.2
				Pirgu							Neichianshanian/Hanjiang			449.5
				Vormsi										449.6 *
				Vormsi			Berounian							449.7 *
				Nabala	Johvi †									450 *
			Viru	Rakvere										450.6 *
				Oandu										452 *
		Sandbian		Keila	Idavere †									453
				Haljala										453.9
				Haljala					Zahorany †/Vinice	Letna †				456.2 *
				Kukruse										456.4 *
				Uhaku	Aluoja †									457.5 *
								Liben †						458 *
	Middle Ordovician	Darriwilian									Darriwilian	Guniu †/Hulo		458.4
							Dobrotivian							458.5 *
				Lasnamagi			Dobrotivian							458.9 *
				Lasnamagi			Oretanian							459.7 *
				Aseri										460.4 *
				Aseri				Sarka †						461.7 *
			Oeland	Kunda										462.9 *
					Valaste †/Hunderum									464.3 *
												Hunjiang †	Dawan †/Daobaowan/Ningkuo	466.3 *
				Volkhov		Langevoja †/Vaana/Saka								467.1 *
		Dapingian						Klabava †			Dapingian			467.3
							Arenigian							468
				Billingen										469.3 *
	Early Ordovician	Floian									Yiyangian			470
					Latorp †									470.1 *
				Hunneberg										473.7 *
		Tremadocian					Tremadocian				Xinchangian			477.7
													Lianghekou †	477.9 *
				Varangu										481.3 *
				Pakerort										482.2 *
														485.4 *
														486.3
														486.5