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. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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

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			Cambrian of Kazakhstan	Ordovician of Australia	Ten Million Year Bins	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian		Bolindian	Ordovician 5	Kosovian				443.8
		Katian		Bolindian		Kralodvorian	Bohdalec †			445.2
				Eastonian		Kralodvorian				449 *
				Eastonian		Berounian				449.7 *
				Gisbornian						452 *
		Sandbian			Ordovician 4					453
								Zahorany †/Vinice	Letna †	456.2 *
							Liben †			458 *
	Middle Ordovician	Darriwilian		Darriwilian	Ordovician 3					458.4
						Dobrotivian				458.5 *
						Oretanian				459.7 *
							Sarka †			461.7 *
		Dapingian		Yapeenian	Ordovician 2		Klabava †			467.3
				Yapeenian		Arenigian				468
				Castlemainian						468.5 *
	Early Ordovician	Floian		Chewtonian						470
				Bendigonian						471.8 *
				Lancefieldian						473.5 *
		Tremadocian	Ungurian	Lancefieldian	Ordovician 1	Tremadocian				477.7
		Tremadocian	Ungurian	Warendian	Ordovician 1	Tremadocian				482.8 *
										485.4