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
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
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
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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126778 collections

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International Chronostratigraphic Timescale			Ordovician of North America					Ordovician of Ibero-Bohemia				Ordovician of the Baltic				Ordovician of China
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian				Kosovian				Harju	Porkuni			Hirnantian	Xiaoxita †/Shikou	Wufeng †	443.8
		Katian		Gamachian				Kralodvorian	Bohdalec †				Pirgu			Chientangkiangian			445.2
				Richmondian												Chientangkiangian			446 *
																Neichianshanian/Hanjiang			449.5
													Vormsi						449.6 *
								Berounian											449.7 *
				Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian														449.8 *
				Maysvillian									Nabala	Johvi †					450 *
				Edenian									Nabala						450.4 *
				Edenian								Viru	Rakvere						450.6 *
			Mohawkian	Chatfieldian									Rakvere						451.1 *
													Oandu						452 *
		Sandbian											Keila	Idavere †					453
				Turinian									Keila						453.7 *
													Haljala						453.9
										Zahorany †/Vinice	Letna †		Haljala						456.2 *
													Kukruse						456.4 *
			Whiterockian		Canadian †	Chazyan †/Marmor							Kukruse						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 *
				Rangerian									Billingen						469.3 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †									Yiyangian			470
														Latorp †					470.1 *
													Hunneberg						473.7 *
				Tulean															473.9 *
		Tremadocian						Tremadocian								Xinchangian			477.7
																		Lianghekou †	477.9 *
				Stairsian															480.3 *
				Stairsian									Varangu						481.3 *
				Skullrockian/Demingian									Varangu						482 *
				Skullrockian/Demingian									Pakerort						482.2 *
																			485.4 *
																			486.3
																			486.5
																			487.5