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
M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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 126762 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of the Baltic				Ordovician of China
Ordovician	Late Ordovician	Hirnantian	Kosovian				Harju	Porkuni			Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian	Kralodvorian	Bohdalec †				Pirgu			Chientangkiangian		Wufeng †	445.2
								Pirgu			Neichianshanian/Hanjiang			449.5
								Vormsi						449.6 *
			Berounian					Vormsi						449.7 *
								Nabala	Johvi †					450 *
							Viru	Rakvere						450.6 *
								Oandu						452 *
		Sandbian						Keila	Idavere †					453
								Haljala						453.9
					Zahorany †/Vinice	Letna †		Haljala						456.2 *
								Kukruse						456.4 *
								Uhaku	Aluoja †					457.5 *
				Liben †										458 *
	Middle Ordovician	Darriwilian									Darriwilian	Guniu †/Hulo		458.4
			Dobrotivian											458.5 *
			Dobrotivian					Lasnamagi						458.9 *
			Oretanian					Lasnamagi						459.7 *
								Aseri						460.4 *
				Sarka †				Aseri						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