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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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
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
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 126606 collections

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International Chronostratigraphic Timescale			Ordovician of Ibero-Bohemia				Ordovician of China			Ordovician of the Baltic				Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Kosovian				Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni			Cincinnatian	Gamachian				443.8
		Katian	Kralodvorian	Bohdalec †			Chientangkiangian				Pirgu				Gamachian				445.2
							Chientangkiangian								Richmondian				446 *
							Neichianshanian/Hanjiang												449.5
											Vormsi								449.6 *
			Berounian																449.7 *
															Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
											Nabala	Johvi †			Maysvillian				450 *
											Nabala				Edenian				450.4 *
										Viru	Rakvere				Edenian				450.6 *
											Rakvere			Mohawkian	Chatfieldian				451.1 *
											Oandu								452 *
		Sandbian									Keila	Idavere †							453
											Keila				Turinian				453.7 *
											Haljala								453.9
					Zahorany †/Vinice	Letna †					Haljala								456.2 *
											Kukruse								456.4 *
											Kukruse			Whiterockian		Canadian †	Chazyan †/Marmor		457 *
											Uhaku	Aluoja †							457.5 *
				Liben †															458 *
	Middle Ordovician	Darriwilian					Darriwilian	Guniu †/Hulo											458.4
			Dobrotivian																458.5 *
			Dobrotivian								Lasnamagi								458.9 *
			Oretanian								Lasnamagi								459.7 *
											Aseri								460.4 *
				Sarka †							Aseri								461.7 *
										Oeland	Kunda								462.9 *
												Valaste †/Hunderum							464.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo										466.3 *
											Volkhov		Langevoja †/Vaana/Saka						467.1 *
		Dapingian		Klabava †			Dapingian												467.3
			Arenigian																468
															Rangerian				469.1 *
											Billingen				Rangerian				469.3 *
	Early Ordovician	Floian					Yiyangian							Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
												Latorp †							470.1 *
											Hunneberg								473.7 *
															Tulean				473.9 *
		Tremadocian	Tremadocian				Xinchangian												477.7
									Lianghekou †										477.9 *
															Stairsian				480.3 *
											Varangu				Stairsian				481.3 *
											Varangu				Skullrockian/Demingian				482 *
											Pakerort				Skullrockian/Demingian				482.2 *
																			485.4 *
																			486.3
																			486.5
																			487.5