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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
P. L. Gibbard, M. J. Head, and M. J. C. Walker. 2010. Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma. Journal of Quaternary Science 25(2):96-102 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126610 collections

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International Chronostratigraphic Timescale			Cambrian of Kazakhstan	Ordovician of Ibero-Bohemia				Cambrian of Siberia	Ordovician of the Baltic				Ordovician of North America
Ordovician	Late Ordovician	Hirnantian		Kosovian					Harju	Porkuni			Cincinnatian	Gamachian				443.8
		Katian		Kralodvorian	Bohdalec †					Pirgu				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
						Zahorany †/Vinice	Letna †			Haljala								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 *
				Dobrotivian						Lasnamagi								458.9 *
				Oretanian						Lasnamagi								459.7 *
										Aseri								460.4 *
					Sarka †					Aseri								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	Ungurian	Tremadocian										Tulean				477.7
														Stairsian				480.3 *
										Varangu				Stairsian				481.3 *
										Varangu				Skullrockian/Demingian				482 *
										Pakerort								482.2 *
								Mansian †		Pakerort								483.55 *
																		485.4 *
																		486.3
																		486.5
																		487.5