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
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
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 126848 collections

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International Chronostratigraphic Timescale			Ordovician of Australia	Ordovician of China			Ordovician of Ibero-Bohemia				Ordovician of North America					Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Bolindian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Kosovian				Cincinnatian	Gamachian				Harju	Porkuni			443.8
		Katian		Chientangkiangian			Kralodvorian	Bohdalec †				Gamachian					Pirgu			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 *
												Maysvillian					Nabala	Johvi †		450 *
												Edenian					Nabala			450.4 *
												Edenian				Viru	Rakvere			450.6 *
											Mohawkian	Chatfieldian					Rakvere			451.1 *
			Gisbornian														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	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	Dapingian				Klabava †												467.3
			Yapeenian				Arenigian													468
			Castlemainian																	468.5 *
												Rangerian								469.1 *
												Rangerian					Billingen			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		Xinchangian			Tremadocian													477.7
						Lianghekou †														477.9 *
												Stairsian								480.3 *
												Stairsian					Varangu			481.3 *
												Skullrockian/Demingian					Varangu			482 *
																	Pakerort			482.2 *
			Warendian														Pakerort			482.8 *
																				485.4 *
																				486.3
																				486.5
																				487.5