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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 North America		Cambrian of Australia	Cambrian of Siberia			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
				Cressagian														480.8 *
				Cressagian						Mansian †								483.55 *
										Mansian †								485 *
Cambrian	Furongian	Stage 10						Franconian †/Dresbachian/Millardan	Datsonian	Batyrbaian	Tavgian †	Ketyan †/Yurakian					Late Cambrian	485.4
									Payntonian									486.8 *
							Sunwaptan		Payntonian									487.5
		Jiangshanian							Iverian									489.5
										Aksaian								490.7 *
										Sakian								492.2 *
							Steptoean											493 *
		Paibian							Idamean									494
		Paibian							Idamean			Ensyan †/Maduan/Nganasanian						494.7 *
	Miaolingian	Guzhangian					Marjumian	Albertian †	Mindyallan	Ayusokkanian							Middle Cambrian	497
									Boomerangian	Ayusokkanian								499
									Boomerangian	Mayan/Menevian								499.5
		Drumian							Undillan									500.5
		Drumian							Floran									503
		Wuliuan					Topazan		Templetonian	Amgan/Solvan								504.5
							Delamaran		Templetonian									506.5
									Ordian									507.8 *
	Series 2	Stage 4						Waucoban †									Early Cambrian	509
										Toyonian	Lenian †							510 *
																		510.8 *
							Dyeran											511 *
										Botomian								512.5 *
		Stage 3																514
							Montezuman											514.8 *
							Montezuman			Atdabanian								515.6 *
							Begadean			Atdabanian								519.9 *
	Terreneuvian	Stage 2								Tommotian								521
		Stage 2								Nemakit-Daldynian								525.5
		Fortunian								Nemakit-Daldynian	Manykaian †							529
																		538.8