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
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
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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126585 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic				Ordovician of China			Ordovician of North America					Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Harju	Porkuni			Hirnantian	Xiaoxita †/Shikou	Wufeng †	Cincinnatian	Gamachian				Kosovian				443.8
		Katian		Pirgu			Chientangkiangian				Gamachian				Kralodvorian	Bohdalec †			445.2
							Chientangkiangian				Richmondian								446 *
							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 *
				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					Darriwilian	Guniu †/Hulo											458.4
															Dobrotivian				458.5 *
				Lasnamagi											Dobrotivian				458.9 *
				Lasnamagi											Oretanian				459.7 *
				Aseri															460.4 *
				Aseri												Sarka †			461.7 *
			Oeland	Kunda															462.9 *
					Valaste †/Hunderum														464.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo										466.3 *
				Volkhov		Langevoja †/Vaana/Saka													467.1 *
		Dapingian					Dapingian									Klabava †			467.3
															Arenigian				468
											Rangerian								469.1 *
				Billingen							Rangerian								469.3 *
	Early Ordovician	Floian					Yiyangian			Ibexian	Blackhillsian		Jeffersonian †	Cassinian †					470
					Latorp †														470.1 *
				Hunneberg															473.7 *
											Tulean								473.9 *
		Tremadocian					Xinchangian								Tremadocian				477.7
									Lianghekou †										477.9 *
											Stairsian								480.3 *
				Varangu							Stairsian								481.3 *
				Varangu							Skullrockian/Demingian								482 *
				Pakerort							Skullrockian/Demingian								482.2 *
																			485.4 *
																			486.3
																			486.5
																			487.5