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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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

Show more time

Show linear time

International Chronostratigraphic Timescale			Ordovician of Britain				Cambrian of Siberia			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
				Cressagian													480.8 *
				Cressagian			Mansian †										483.55 *
							Mansian †										485 *
Cambrian	Furongian	Stage 10					Batyrbaian	Tavgian †	Ketyan †/Yurakian						Franconian †/Dresbachian/Millardan	Late Cambrian	485.4
		Stage 10												Sunwaptan			487.5
		Jiangshanian															489.5
							Aksaian										490.7 *
							Sakian										492.2 *
														Steptoean			493 *
		Paibian															494
		Paibian							Ensyan †/Maduan/Nganasanian								494.7 *
	Miaolingian	Guzhangian					Ayusokkanian							Marjumian	Albertian †	Middle Cambrian	497
		Guzhangian					Mayan/Menevian										499.5
		Drumian					Mayan/Menevian										500.5
		Wuliuan					Amgan/Solvan							Topazan			504.5
		Wuliuan												Delamaran			506.5
	Series 2	Stage 4													Waucoban †	Early Cambrian	509
							Toyonian	Lenian †									510 *
							Toyonian							Dyeran			511 *
							Botomian										512.5 *
		Stage 3															514
														Montezuman			514.8 *
							Atdabanian							Montezuman			515.6 *
							Atdabanian							Begadean			519.9 *
	Terreneuvian	Stage 2					Tommotian										521
		Stage 2					Nemakit-Daldynian										525.5
		Fortunian					Nemakit-Daldynian	Manykaian †									529
																	538.8