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
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			Cambrian of Britain		Ordovician of Australia	Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †			Bolindian				443.8
		Katian		Rawtheyan			Chientangkiangian									445.2
				Cautleyan												448.9 *
				Cautleyan								Eastonian				449 *
				Pusgillian												449.3 *
				Pusgillian			Neichianshanian/Hanjiang									449.5
			Caradoc	Streffordian	Onnian †											449.6 *
				Cheneyan												451.5 *
				Cheneyan								Gisbornian				452 *
				Burrellian												452.7 *
		Sandbian														453
					Actonian †											453.2 *
					Marshbrookian †	Woolstonian †										454.2 *
					Longvillian †											455.2 *
				Aurelucian	Longvillian †											456.8 *
				Aurelucian	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 *
	Early Ordovician	Floian					Yiyangian					Chewtonian				470
				Whitlandian								Chewtonian				471.1 *
												Bendigonian				471.8 *
												Lancefieldian				473.5 *
				Moridunian												474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian									477.7
				Migneintian					Lianghekou †							477.9 *
				Cressagian												480.8 *
				Cressagian								Warendian				482.8 *
												Warendian				485 *
Cambrian	Furongian	Stage 10								Merioneth	Dolgellian/Trempealeauan			Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
											Dolgellian/Trempealeauan		Sunwaptan			487.5
											Festiniogian					489.2 *
		Jiangshanian														489.5
													Steptoean			493 *
											Maentwrogian					493.1 *
		Paibian									Maentwrogian					494
	Miaolingian	Guzhangian								St Davids			Marjumian	Albertian †	Middle Cambrian	497
		Drumian											Marjumian			500.5
		Wuliuan											Topazan			504.5
		Wuliuan											Delamaran			506.5
	Series 2	Stage 4								Caerfai			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