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
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 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
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
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 126662 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of Ibero-Bohemia				Cambrian of Kazakhstan	Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Kosovian					Cincinnatian	Gamachian				443.8
		Katian		Pirgu			Kralodvorian	Bohdalec †					Gamachian				445.2
				Pirgu									Richmondian				446 *
				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
				Haljala					Zahorany †/Vinice	Letna †							456.2 *
				Kukruse													456.4 *
				Kukruse								Whiterockian		Canadian †	Chazyan †/Marmor		457 *
				Uhaku	Aluoja †												457.5 *
								Liben †									458 *
	Middle Ordovician	Darriwilian															458.4
							Dobrotivian										458.5 *
				Lasnamagi			Dobrotivian										458.9 *
				Lasnamagi			Oretanian										459.7 *
				Aseri													460.4 *
				Aseri				Sarka †									461.7 *
			Oeland	Kunda													462.9 *
				Kunda	Valaste †/Hunderum												464.3 *
				Volkhov		Langevoja †/Vaana/Saka											467.1 *
		Dapingian						Klabava †									467.3
							Arenigian										468
													Rangerian				469.1 *
				Billingen									Rangerian				469.3 *
	Early Ordovician	Floian										Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
					Latorp †												470.1 *
				Hunneberg													473.7 *
													Tulean				473.9 *
		Tremadocian					Tremadocian				Ungurian		Tulean				477.7
													Stairsian				480.3 *
				Varangu									Stairsian				481.3 *
				Varangu									Skullrockian/Demingian				482 *
				Pakerort									Skullrockian/Demingian				482.2 *
																	485.4 *
																	486.3
																	486.5
																	487.5