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				Cambrian of Australia	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					Datsonian					Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
							Payntonian							486.8 *
							Payntonian				Sunwaptan			487.5
		Jiangshanian					Iverian				Sunwaptan			489.5
		Jiangshanian					Iverian				Steptoean			493 *
		Paibian					Idamean				Steptoean			494
	Miaolingian	Guzhangian					Mindyallan				Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian					Boomerangian							499
		Drumian					Undillan							500.5
		Drumian					Floran							503
		Wuliuan					Templetonian				Topazan			504.5
							Templetonian				Delamaran			506.5
							Ordian							507.8 *
	Series 2	Stage 4					Ordian					Waucoban †	Early Cambrian	509
														510.8 *
											Dyeran			511 *
		Stage 3									Dyeran			514
											Montezuman			514.8 *
											Begadean			519.9 *
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
														538.8