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
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 126679 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of the Baltic				Ten Million Year Bins
Ordovician	Late Ordovician	Hirnantian	Kosovian				Harju	Porkuni			Ordovician 5	443.8
		Katian	Kralodvorian	Bohdalec †				Pirgu				445.2
			Kralodvorian					Vormsi				449.6 *
			Berounian					Vormsi				449.7 *
								Nabala	Johvi †			450 *
							Viru	Rakvere				450.6 *
								Oandu				452 *
		Sandbian						Keila	Idavere †		Ordovician 4	453
								Haljala				453.9
					Zahorany †/Vinice	Letna †		Haljala				456.2 *
								Kukruse				456.4 *
								Uhaku	Aluoja †			457.5 *
				Liben †								458 *
	Middle Ordovician	Darriwilian									Ordovician 3	458.4
			Dobrotivian									458.5 *
			Dobrotivian					Lasnamagi				458.9 *
			Oretanian					Lasnamagi				459.7 *
								Aseri				460.4 *
				Sarka †				Aseri				461.7 *
							Oeland	Kunda				462.9 *
								Kunda	Valaste †/Hunderum			464.3 *
								Volkhov		Langevoja †/Vaana/Saka		467.1 *
		Dapingian		Klabava †							Ordovician 2	467.3
			Arenigian									468
								Billingen				469.3 *
	Early Ordovician	Floian										470
									Latorp †			470.1 *
								Hunneberg				473.7 *
		Tremadocian	Tremadocian					Hunneberg			Ordovician 1	477.7
								Varangu				481.3 *
								Pakerort				482.2 *
												485.4 *
												486.3
												486.5