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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				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										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