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
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. 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
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 126973 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of the Baltic				Cambrian of Kazakhstan	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Harju	Porkuni				Cincinnatian	Gamachian				443.8
		Katian		Rawtheyan				Pirgu					Gamachian				445.2
				Rawtheyan									Richmondian				446 *
				Cautleyan													448.9 *
				Pusgillian													449.3 *
			Caradoc	Streffordian	Onnian †			Vormsi									449.6 *
								Vormsi					Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
								Nabala	Johvi †				Maysvillian				450 *
								Nabala					Edenian				450.4 *
							Viru	Rakvere					Edenian				450.6 *
												Mohawkian	Chatfieldian				451.1 *
				Cheneyan													451.5 *
				Cheneyan				Oandu									452 *
				Burrellian				Oandu									452.7 *
		Sandbian						Keila	Idavere †								453
					Actonian †												453.2 *
													Turinian				453.7 *
								Haljala									453.9
					Marshbrookian †	Woolstonian †											454.2 *
					Longvillian †												455.2 *
								Kukruse									456.4 *
				Aurelucian													456.8 *
												Whiterockian		Canadian †	Chazyan †/Marmor		457 *
					Soudleyan †/Harnagian/Costonian												457.4 *
					Soudleyan †/Harnagian/Costonian			Uhaku	Aluoja †								457.5 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Uhaku									458.4
								Lasnamagi									458.9 *
								Aseri									460.4 *
				Abereiddian/Early Llanvirn				Aseri									461.3 *
							Oeland	Kunda									462.9 *
								Kunda	Valaste †/Hunderum								464.3 *
								Volkhov		Langevoja †/Vaana/Saka							467.1 *
		Dapingian															467.3
			Arenig	Fennian													468.4 *
													Rangerian				469.1 *
								Billingen					Rangerian				469.3 *
	Early Ordovician	Floian										Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
									Latorp †								470.1 *
				Whitlandian													471.1 *
								Hunneberg									473.7 *
													Tulean				473.9 *
				Moridunian													474.3 *
		Tremadocian	Tremadoc	Migneintian							Ungurian						477.7
				Migneintian									Stairsian				480.3 *
				Cressagian													480.8 *
								Varangu									481.3 *
								Varangu					Skullrockian/Demingian				482 *
								Pakerort									482.2 *
								Pakerort									485 *
																	485.4 *
																	486.3
																	486.5
																	487.5