PBDB Timescale

Ordovician of Britain

The interval definitions in this timescale are derived from the following sources:

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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 14 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 4548 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Ibero-Bohemia				Ordovician of North America					Ordovician of China			Cambrian of China		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Kosovian				Cincinnatian	Gamachian				Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
		Katian		Rawtheyan			Kralodvorian	Bohdalec †				Gamachian				Chientangkiangian						445.2
				Rawtheyan								Richmondian										446 *
				Cautleyan																		448.9 *
				Pusgillian																		449.3 *
				Pusgillian												Neichianshanian/Hanjiang						449.5
			Caradoc	Streffordian	Onnian †																	449.6 *
							Berounian															449.7 *
												Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian									449.8 *
												Edenian										450.4 *
											Mohawkian	Chatfieldian										451.1 *
				Cheneyan																		451.5 *
				Burrellian																		452.7 *
		Sandbian																				453
					Actonian †																	453.2 *
					Actonian †							Turinian										453.7 *
					Marshbrookian †	Woolstonian †																454.2 *
					Longvillian †																	455.2 *
									Zahorany †/Vinice	Letna †												456.2 *
				Aurelucian																		456.8 *
											Whiterockian		Canadian †	Chazyan †/Marmor								457 *
					Soudleyan †/Harnagian/Costonian																	457.4 *
					Soudleyan †/Harnagian/Costonian			Liben †														458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn												Darriwilian	Guniu †/Hulo					458.4
							Dobrotivian															458.5 *
							Oretanian															459.7 *
				Abereiddian/Early Llanvirn																		461.3 *
								Sarka †														461.7 *
								Sarka †									Hunjiang †	Dawan †/Daobaowan/Ningkuo				466.3 *
		Dapingian						Klabava †								Dapingian						467.3
							Arenigian															468
			Arenig	Fennian																		468.4 *
												Rangerian										469.1 *
	Early Ordovician	Floian									Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	Yiyangian						470
				Whitlandian								Blackhillsian										471.1 *
				Whitlandian								Tulean										473.9 *
				Moridunian																		474.3 *
		Tremadocian	Tremadoc	Migneintian			Tremadocian									Xinchangian						477.7
																		Lianghekou †				477.9 *
												Stairsian										480.3 *
				Cressagian								Stairsian										480.8 *
				Cressagian								Skullrockian			Demingian †							482 *
															Demingian †							485 *
Cambrian	Furongian	Stage 10																	Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Stage 10																	Niuchehean			487.5
		Jiangshanian																	Jiangshanian			489.5
		Paibian																	Paibian			494
		Paibian																	Paibian	Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian																	Guzhangian	Wangcunian †	Middle Cambrian	497
		Drumian																	Drumian	Wangcunian †		500.5
		Wuliuan																	Wuliuan/Taijangian			504.5
	Series 2	Stage 4																	Duyunian		Early Cambrian	509
	Series 2	Stage 3																	Nangaoian			514
	Terreneuvian	Stage 2																	Meishucunian			521
		Fortunian																	Meishucunian			529
		Fortunian																	Jinnigian			530.7
																						538.8