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 4546 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of China			Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †				443.8
		Katian		Rawtheyan			Chientangkiangian						445.2
				Cautleyan									448.9 *
				Pusgillian									449.3 *
				Pusgillian			Neichianshanian/Hanjiang						449.5
			Caradoc	Streffordian	Onnian †								449.6 *
				Cheneyan									451.5 *
				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					458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo					461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo				466.3 *
		Dapingian					Dapingian						467.3
		Dapingian	Arenig	Fennian			Dapingian						468.4 *
	Early Ordovician	Floian		Fennian			Yiyangian						470
				Whitlandian									471.1 *
				Moridunian									474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian						477.7
				Migneintian					Lianghekou †				477.9 *
				Cressagian									480.8 *
													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