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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 127017 collections

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International Chronostratigraphic Timescale			Cambrian of Siberia	Ordovician of Ibero-Bohemia				Ordovician of Australia
Ordovician	Late Ordovician	Hirnantian		Kosovian				Bolindian	443.8
		Katian		Kralodvorian	Bohdalec †			Bolindian	445.2
				Kralodvorian				Eastonian	449 *
				Berounian				Eastonian	449.7 *
								Gisbornian	452 *
		Sandbian							453
						Zahorany †/Vinice	Letna †		456.2 *
					Liben †				458 *
	Middle Ordovician	Darriwilian						Darriwilian	458.4
				Dobrotivian					458.5 *
				Oretanian					459.7 *
					Sarka †				461.7 *
		Dapingian			Klabava †			Yapeenian	467.3
				Arenigian				Yapeenian	468
								Castlemainian	468.5 *
	Early Ordovician	Floian						Chewtonian	470
								Bendigonian	471.8 *
								Lancefieldian	473.5 *
		Tremadocian		Tremadocian				Lancefieldian	477.7
								Warendian	482.8 *
			Mansian †					Warendian	483.55 *
									485.4