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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
F. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) 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 126701 collections

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International Chronostratigraphic Timescale			Ordovician of China			Ordovician of the Baltic				Ordovician of Britain				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni			Ashgill	Hirnantian			Kosovian				443.8
		Katian	Chientangkiangian				Pirgu				Rawtheyan			Kralodvorian	Bohdalec †			445.2
											Cautleyan							448.9 *
											Pusgillian							449.3 *
			Neichianshanian/Hanjiang								Pusgillian							449.5
							Vormsi			Caradoc	Streffordian	Onnian †						449.6 *
							Vormsi							Berounian				449.7 *
							Nabala	Johvi †										450 *
						Viru	Rakvere											450.6 *
							Rakvere				Cheneyan							451.5 *
							Oandu				Cheneyan							452 *
							Oandu				Burrellian							452.7 *
		Sandbian					Keila	Idavere †										453
							Keila					Actonian †						453.2 *
							Haljala					Actonian †						453.9
												Marshbrookian †	Woolstonian †					454.2 *
												Longvillian †						455.2 *
																Zahorany †/Vinice	Letna †	456.2 *
							Kukruse											456.4 *
											Aurelucian							456.8 *
												Soudleyan †/Harnagian/Costonian						457.4 *
							Uhaku	Aluoja †										457.5 *
															Liben †			458 *
	Middle Ordovician	Darriwilian	Darriwilian	Guniu †/Hulo						Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
														Dobrotivian				458.5 *
							Lasnamagi							Dobrotivian				458.9 *
							Lasnamagi							Oretanian				459.7 *
							Aseri											460.4 *
											Abereiddian/Early Llanvirn							461.3 *
															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
										Arenig	Fennian							468.4 *
							Billingen											469.3 *
	Early Ordovician	Floian	Yiyangian															470
								Latorp †										470.1 *
											Whitlandian							471.1 *
							Hunneberg				Whitlandian							473.7 *
											Moridunian							474.3 *
		Tremadocian	Xinchangian							Tremadoc	Migneintian			Tremadocian				477.7
					Lianghekou †						Migneintian							477.9 *
											Cressagian							480.8 *
							Varangu											481.3 *
							Pakerort											482.2 *
							Pakerort											485 *
																		485.4 *
																		486.3
																		486.5