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
F. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) 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 126764 collections

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International Chronostratigraphic Timescale			Cambrian of Siberia	Ordovician of Australia	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian		Bolindian	Cincinnatian	Gamachian				443.8
		Katian				Gamachian				445.2
						Richmondian				446 *
				Eastonian		Richmondian				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 *
				Castlemainian		Rangerian				469.1 *
	Early Ordovician	Floian		Chewtonian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	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