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
J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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, 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 127057 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of China			Ordovician of Australia	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Kosovian				Hirnantian	Xiaoxita †/Shikou	Wufeng †	Bolindian	Cincinnatian	Gamachian				443.8
		Katian	Kralodvorian	Bohdalec †			Chientangkiangian					Gamachian				445.2
												Richmondian				446 *
										Eastonian						449 *
							Neichianshanian/Hanjiang									449.5
			Berounian													449.7 *
												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 *
					Zahorany †/Vinice	Letna †						Turinian				456.2 *
					Zahorany †/Vinice						Whiterockian		Canadian †	Chazyan †/Marmor		457 *
				Liben †												458 *
	Middle Ordovician	Darriwilian					Darriwilian	Guniu †/Hulo		Darriwilian						458.4
			Dobrotivian													458.5 *
			Oretanian													459.7 *
				Sarka †												461.7 *
				Sarka †				Hunjiang †	Dawan †/Daobaowan/Ningkuo							466.3 *
		Dapingian		Klabava †			Dapingian			Yapeenian						467.3
			Arenigian							Yapeenian						468
										Castlemainian						468.5 *
										Castlemainian		Rangerian				469.1 *
	Early Ordovician	Floian					Yiyangian			Chewtonian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
										Bendigonian						471.8 *
										Lancefieldian						473.5 *
												Tulean				473.9 *
		Tremadocian	Tremadocian				Xinchangian									477.7
									Lianghekou †							477.9 *
												Stairsian				480.3 *
												Skullrockian/Demingian				482 *
										Warendian		Skullrockian/Demingian				482.8 *
																485.4
																487.5