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 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of China			Ordovician of North America					Cambrian Epochs	Ordovician of Australia
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †	Cincinnatian	Gamachian					Bolindian	443.8
		Katian		Rawtheyan			Chientangkiangian				Gamachian						445.2
				Rawtheyan							Richmondian						446 *
				Cautleyan													448.9 *
				Cautleyan												Eastonian	449 *
				Pusgillian													449.3 *
				Pusgillian			Neichianshanian/Hanjiang										449.5
			Caradoc	Streffordian	Onnian †												449.6 *
											Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian					449.8 *
											Edenian						450.4 *
										Mohawkian	Chatfieldian						451.1 *
				Cheneyan													451.5 *
				Cheneyan												Gisbornian	452 *
				Burrellian													452.7 *
		Sandbian															453
					Actonian †												453.2 *
					Actonian †						Turinian						453.7 *
					Marshbrookian †	Woolstonian †											454.2 *
					Longvillian †												455.2 *
				Aurelucian													456.8 *
										Whiterockian		Canadian †	Chazyan †/Marmor				457 *
					Soudleyan †/Harnagian/Costonian												457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Darriwilian	Guniu †/Hulo								Darriwilian	458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo									461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo								466.3 *
		Dapingian					Dapingian									Yapeenian	467.3
			Arenig	Fennian												Yapeenian	468.4 *
																Castlemainian	468.5 *
											Rangerian					Castlemainian	469.1 *
	Early Ordovician	Floian					Yiyangian			Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		Chewtonian	470
				Whitlandian												Chewtonian	471.1 *
																Bendigonian	471.8 *
																Lancefieldian	473.5 *
											Tulean						473.9 *
				Moridunian													474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian										477.7
									Lianghekou †								477.9 *
											Stairsian						480.3 *
				Cressagian							Stairsian						480.8 *
											Skullrockian			Demingian †			482 *
																Warendian	482.8 *
																Warendian	485 *
Cambrian	Furongian	Stage 10													Late Cambrian		485.4
		Stage 10															487.5
		Jiangshanian															489.5
		Paibian															494
	Miaolingian	Guzhangian													Middle Cambrian		497
		Drumian															500.5
		Wuliuan															504.5
	Series 2	Stage 4													Early Cambrian		509
	Series 2	Stage 3															514
	Terreneuvian	Stage 2															521
	Terreneuvian	Fortunian															529
																	538.8