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 North America					Ordovician of Australia	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Cincinnatian	Gamachian				Bolindian				443.8
		Katian		Rawtheyan				Gamachian								445.2
				Rawtheyan				Richmondian								446 *
				Cautleyan												448.9 *
				Cautleyan								Eastonian				449 *
				Pusgillian												449.3 *
			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				458.4
		Darriwilian		Abereiddian/Early Llanvirn								Darriwilian				461.3 *
		Dapingian		Abereiddian/Early Llanvirn								Yapeenian				467.3
			Arenig	Fennian								Yapeenian				468.4 *
												Castlemainian				468.5 *
								Rangerian				Castlemainian				469.1 *
	Early Ordovician	Floian					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												477.7
				Migneintian				Stairsian								480.3 *
				Cressagian				Stairsian								480.8 *
								Skullrockian			Demingian †					482 *
												Warendian				482.8 *
												Warendian				485 *
Cambrian	Furongian	Stage 10												Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10											Sunwaptan			487.5
		Jiangshanian											Sunwaptan			489.5
		Jiangshanian											Steptoean			493 *
		Paibian											Steptoean			494
	Miaolingian	Guzhangian											Marjumian	Albertian †	Middle Cambrian	497
		Drumian											Marjumian			500.5
		Wuliuan											Topazan			504.5
		Wuliuan											Delamaran			506.5
	Series 2	Stage 4											Delamaran	Waucoban †	Early Cambrian	509
		Stage 4											Dyeran			511 *
		Stage 3											Dyeran			514
													Montezuman			514.8 *
													Begadean			519.9 *
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian														529
																538.8