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. 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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
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

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 North America					Ordovician of Britain				Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian	Cincinnatian	Gamachian				Ashgill	Hirnantian			Harju	Porkuni			443.8
		Katian		Gamachian					Rawtheyan				Pirgu			445.2
				Richmondian					Rawtheyan							446 *
									Cautleyan							448.9 *
									Pusgillian							449.3 *
								Caradoc	Streffordian	Onnian †			Vormsi			449.6 *
				Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian								Vormsi			449.8 *
				Maysvillian									Nabala	Johvi †		450 *
				Edenian									Nabala			450.4 *
				Edenian								Viru	Rakvere			450.6 *
			Mohawkian	Chatfieldian												451.1 *
									Cheneyan							451.5 *
									Cheneyan				Oandu			452 *
									Burrellian				Oandu			452.7 *
		Sandbian											Keila	Idavere †		453
										Actonian †						453.2 *
				Turinian												453.7 *
													Haljala			453.9
										Marshbrookian †	Woolstonian †					454.2 *
										Longvillian †						455.2 *
													Kukruse			456.4 *
									Aurelucian							456.8 *
			Whiterockian		Canadian †	Chazyan †/Marmor										457 *
										Soudleyan †/Harnagian/Costonian						457.4 *
										Soudleyan †/Harnagian/Costonian			Uhaku	Aluoja †		457.5 *
	Middle Ordovician	Darriwilian						Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Uhaku			458.4
													Lasnamagi			458.9 *
													Aseri			460.4 *
									Abereiddian/Early Llanvirn				Aseri			461.3 *
												Oeland	Kunda			462.9 *
													Kunda	Valaste †/Hunderum		464.3 *
													Volkhov		Langevoja †/Vaana/Saka	467.1 *
		Dapingian														467.3
								Arenig	Fennian							468.4 *
				Rangerian												469.1 *
				Rangerian									Billingen			469.3 *
	Early Ordovician	Floian	Ibexian	Blackhillsian		Jeffersonian †	Cassinian †									470
														Latorp †		470.1 *
									Whitlandian							471.1 *
													Hunneberg			473.7 *
				Tulean												473.9 *
									Moridunian							474.3 *
		Tremadocian						Tremadoc	Migneintian							477.7
				Stairsian					Migneintian							480.3 *
									Cressagian							480.8 *
													Varangu			481.3 *
				Skullrockian/Demingian									Varangu			482 *
													Pakerort			482.2 *
													Pakerort			485 *
																485.4 *
																486.3
																486.5
																487.5