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 Ibero-Bohemia				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									Late Cambrian	485.4
		Jiangshanian										489.5
		Paibian										494
	Miaolingian	Guzhangian									Middle Cambrian	497
		Drumian										500.5
		Wuliuan										504.5
	Series 2	Stage 4									Early Cambrian	509
	Series 2	Stage 3										514
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
												538.8