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 China		Ordovician of Ibero-Bohemia				Cambrian of North America		Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian					Kosovian							443.8
		Katian		Rawtheyan					Kralodvorian	Bohdalec †						445.2
				Cautleyan												448.9 *
				Pusgillian												449.3 *
			Caradoc	Streffordian	Onnian †											449.6 *
				Streffordian					Berounian							449.7 *
				Cheneyan												451.5 *
				Burrellian												452.7 *
		Sandbian														453
					Actonian †											453.2 *
					Marshbrookian †	Woolstonian †										454.2 *
					Longvillian †											455.2 *
											Zahorany †/Vinice	Letna †				456.2 *
				Aurelucian												456.8 *
					Soudleyan †/Harnagian/Costonian											457.4 *
					Soudleyan †/Harnagian/Costonian					Liben †						458 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn												458.4
									Dobrotivian							458.5 *
									Oretanian							459.7 *
				Abereiddian/Early Llanvirn												461.3 *
										Sarka †						461.7 *
		Dapingian								Klabava †						467.3
									Arenigian							468
			Arenig	Fennian												468.4 *
	Early Ordovician	Floian		Fennian												470
				Whitlandian												471.1 *
				Moridunian												474.3 *
		Tremadocian	Tremadoc	Migneintian					Tremadocian							477.7
			Tremadoc	Cressagian												480.8 *
																485 *
Cambrian	Furongian	Stage 10					Niuchehean	Taoyuanian †						Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10					Niuchehean						Sunwaptan			487.5
		Jiangshanian					Jiangshanian						Sunwaptan			489.5
		Jiangshanian					Jiangshanian						Steptoean			493 *
		Paibian					Paibian									494
		Paibian					Paibian	Waergangian †/Youshuanian								494.9 *
	Miaolingian	Guzhangian					Guzhangian	Wangcunian †					Marjumian	Albertian †	Middle Cambrian	497
		Drumian					Drumian	Wangcunian †					Marjumian			500.5
		Wuliuan					Wuliuan/Taijangian						Topazan			504.5
		Wuliuan					Wuliuan/Taijangian						Delamaran			506.5
	Series 2	Stage 4					Duyunian						Delamaran	Waucoban †	Early Cambrian	509
		Stage 4					Duyunian						Dyeran			511 *
		Stage 3					Nangaoian						Dyeran			514
													Montezuman			514.8 *
													Begadean			519.9 *
	Terreneuvian	Stage 2					Meishucunian									521
		Fortunian					Meishucunian									529
		Fortunian					Jinnigian									530.7
																538.8