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
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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
M. Harzhauser and W. E. Piller. 2004. Integrated stratigraphy of the Sarmatian (Upper Middle Miocene) in the western Central Paratethys. Stratigraphy 1(1):65-86 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 126734 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of North America					Cambrian of Siberia	Ordovician of the Baltic				Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian					Harju	Porkuni			Kosovian				443.8
		Katian		Rawtheyan				Gamachian						Pirgu			Kralodvorian	Bohdalec †			445.2
				Rawtheyan				Richmondian													446 *
				Cautleyan																	448.9 *
				Pusgillian																	449.3 *
			Caradoc	Streffordian	Onnian †									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													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 *
																			Zahorany †/Vinice	Letna †	456.2 *
														Kukruse							456.4 *
				Aurelucian																	456.8 *
							Whiterockian		Canadian †	Chazyan †/Marmor											457 *
					Soudleyan †/Harnagian/Costonian																457.4 *
														Uhaku	Aluoja †						457.5 *
																		Liben †			458 *
	Middle Ordovician	Darriwilian	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 *
														Kunda	Valaste †/Hunderum						464.3 *
														Volkhov		Langevoja †/Vaana/Saka					467.1 *
		Dapingian																Klabava †			467.3
																	Arenigian				468
			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													Tremadocian				477.7
				Migneintian				Stairsian													480.3 *
				Cressagian																	480.8 *
														Varangu							481.3 *
								Skullrockian/Demingian						Varangu							482 *
														Pakerort							482.2 *
												Mansian †									483.55 *
												Mansian †									485 *
																					485.4 *
																					486.3
																					486.5
																					487.5