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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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
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 125945 collections

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International Chronostratigraphic Timescale			Ordovician of China			Ordovician of the Baltic				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni			Kosovian				443.8
		Katian	Chientangkiangian		Wufeng †		Pirgu			Kralodvorian	Bohdalec †			445.2
			Neichianshanian/Hanjiang				Pirgu							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	Dapingian								Klabava †			467.3
										Arenigian				468
							Billingen							469.3 *
	Early Ordovician	Floian	Yiyangian											470
								Latorp †						470.1 *
							Hunneberg							473.7 *
		Tremadocian	Xinchangian							Tremadocian				477.7
					Lianghekou †									477.9 *
							Varangu							481.3 *
							Pakerort							482.2 *
														485.4 *
														486.3
														486.5