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			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										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