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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
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 126973 collections

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International Chronostratigraphic Timescale			Ordovician of China			Ordovician of Ibero-Bohemia				Ordovician of North America					Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian				Cincinnatian	Gamachian				Harju	Porkuni			443.8
		Katian	Chientangkiangian			Kralodvorian	Bohdalec †				Gamachian					Pirgu			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 *
											Maysvillian					Nabala	Johvi †		450 *
											Edenian					Nabala			450.4 *
											Edenian				Viru	Rakvere			450.6 *
										Mohawkian	Chatfieldian					Rakvere			451.1 *
																Oandu			452 *
		Sandbian														Keila	Idavere †		453
											Turinian					Keila			453.7 *
																Haljala			453.9
								Zahorany †/Vinice	Letna †							Haljala			456.2 *
																Kukruse			456.4 *
										Whiterockian		Canadian †	Chazyan †/Marmor			Kukruse			457 *
																Uhaku	Aluoja †		457.5 *
							Liben †												458 *
	Middle Ordovician	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	Dapingian				Klabava †												467.3
						Arenigian													468
											Rangerian								469.1 *
											Rangerian					Billingen			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 *
											Stairsian					Varangu			481.3 *
											Skullrockian/Demingian					Varangu			482 *
											Skullrockian/Demingian					Pakerort			482.2 *
																			485.4 *
																			486.3
																			486.5
																			487.5