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
M. Freudenthal. 2006. Mammal Paleogene zones. personal communication view
Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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
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 126778 collections

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International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of Ibero-Bohemia				Ordovician of China			Ordovician of the Baltic				Ordovician of North America
Ordovician	Late Ordovician	Hirnantian	Bolindian	Kosovian				Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni			Cincinnatian	Gamachian				443.8
		Katian		Kralodvorian	Bohdalec †			Chientangkiangian				Pirgu				Gamachian				445.2
																Richmondian				446 *
			Eastonian																	449 *
								Neichianshanian/Hanjiang												449.5
												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 *
			Gisbornian									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	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	Yapeenian		Klabava †			Dapingian												467.3
			Yapeenian	Arenigian																468
			Castlemainian																	468.5 *
																Rangerian				469.1 *
												Billingen				Rangerian				469.3 *
	Early Ordovician	Floian	Chewtonian					Yiyangian							Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
			Chewtonian										Latorp †							470.1 *
			Bendigonian																	471.8 *
			Lancefieldian																	473.5 *
												Hunneberg								473.7 *
																Tulean				473.9 *
		Tremadocian		Tremadocian				Xinchangian												477.7
										Lianghekou †										477.9 *
																Stairsian				480.3 *
												Varangu				Stairsian				481.3 *
												Varangu				Skullrockian/Demingian				482 *
												Pakerort								482.2 *
			Warendian									Pakerort								482.8 *
																				485.4 *
																				486.3
																				486.5
																				487.5