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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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 126831 collections

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International Chronostratigraphic Timescale			Cambrian of Siberia	Ordovician of North America					Ordovician of Australia
Ordovician	Late Ordovician	Hirnantian		Cincinnatian	Gamachian				Bolindian	443.8
		Katian			Gamachian					445.2
					Richmondian					446 *
					Richmondian				Eastonian	449 *
					Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian				449.8 *
					Edenian					450.4 *
				Mohawkian	Chatfieldian					451.1 *
									Gisbornian	452 *
		Sandbian								453
					Turinian					453.7 *
				Whiterockian		Canadian †	Chazyan †/Marmor			457 *
	Middle Ordovician	Darriwilian							Darriwilian	458.4
		Dapingian							Yapeenian	467.3
									Castlemainian	468.5 *
					Rangerian				Castlemainian	469.1 *
	Early Ordovician	Floian		Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	Chewtonian	470
									Bendigonian	471.8 *
									Lancefieldian	473.5 *
					Tulean					473.9 *
		Tremadocian			Tulean					477.7
					Stairsian					480.3 *
					Skullrockian/Demingian					482 *
									Warendian	482.8 *
			Mansian †						Warendian	483.55 *
										485.4
										487.5