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
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
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 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
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 126585 collections

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International Chronostratigraphic Timescale			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	Lancefieldian	Ordovician 1	Tremadocian				477.7
		Tremadocian	Warendian	Ordovician 1	Tremadocian				482.8 *
									485.4