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
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
A. G. Sennikov and V. K. Golubev. 2006. Vyazniki Biotic Assemblage of the Terminal Permian. Paleontological Journal 40(suppl. 4):S475-S481 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

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 126689 collections

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International Chronostratigraphic Timescale			Ordovician of North America					Ordovician of the Baltic				Ten Million Year Bins	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian				Harju	Porkuni			Ordovician 5	Kosovian				443.8
		Katian		Gamachian					Pirgu				Kralodvorian	Bohdalec †			445.2
				Richmondian					Pirgu								446 *
									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 †		Ordovician 4					453
				Turinian					Keila								453.7 *
									Haljala								453.9
									Haljala						Zahorany †/Vinice	Letna †	456.2 *
									Kukruse								456.4 *
			Whiterockian		Canadian †	Chazyan †/Marmor			Kukruse								457 *
									Uhaku	Aluoja †							457.5 *
														Liben †			458 *
	Middle Ordovician	Darriwilian										Ordovician 3					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										Ordovician 2		Klabava †			467.3
													Arenigian				468
				Rangerian													469.1 *
				Rangerian					Billingen								469.3 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †										470
										Latorp †							470.1 *
									Hunneberg								473.7 *
				Tulean													473.9 *
		Tremadocian		Tulean								Ordovician 1	Tremadocian				477.7
				Stairsian													480.3 *
				Stairsian					Varangu								481.3 *
				Skullrockian/Demingian					Varangu								482 *
				Skullrockian/Demingian					Pakerort								482.2 *
																	485.4 *
																	486.3
																	486.5
																	487.5