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 4548 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of China			Cambrian of Britain		Cambrian Epochs	Ordovician of Australia	Cambrian of China		Cambrian of Australia	Ordovician of Ibero-Bohemia				Cambrian of North America
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †				Bolindian				Kosovian						443.8
		Katian		Rawtheyan			Chientangkiangian										Kralodvorian	Bohdalec †					445.2
				Cautleyan																			448.9 *
				Cautleyan									Eastonian										449 *
				Pusgillian																			449.3 *
				Pusgillian			Neichianshanian/Hanjiang																449.5
			Caradoc	Streffordian	Onnian †																		449.6 *
				Streffordian													Berounian						449.7 *
				Cheneyan																			451.5 *
				Cheneyan									Gisbornian										452 *
				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			Darriwilian	Guniu †/Hulo					Darriwilian										458.4
																	Dobrotivian						458.5 *
																	Oretanian						459.7 *
				Abereiddian/Early Llanvirn																			461.3 *
																		Sarka †					461.7 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo									Sarka †					466.3 *
		Dapingian					Dapingian						Yapeenian					Klabava †					467.3
																	Arenigian						468
			Arenig	Fennian																			468.4 *
													Castlemainian										468.5 *
	Early Ordovician	Floian					Yiyangian						Chewtonian										470
				Whitlandian									Chewtonian										471.1 *
													Bendigonian										471.8 *
													Lancefieldian										473.5 *
				Moridunian																			474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian										Tremadocian						477.7
				Migneintian					Lianghekou †														477.9 *
				Cressagian																			480.8 *
				Cressagian									Warendian										482.8 *
													Warendian										485 *
Cambrian	Furongian	Stage 10								Merioneth	Dolgellian/Trempealeauan	Late Cambrian		Niuchehean	Taoyuanian †	Datsonian						Franconian †/Dresbachian/Millardan	485.4
																Payntonian							486.8 *
																					Sunwaptan		487.5
											Festiniogian												489.2 *
		Jiangshanian												Jiangshanian		Iverian							489.5
																					Steptoean		493 *
											Maentwrogian												493.1 *
		Paibian												Paibian		Idamean							494
		Paibian												Paibian	Waergangian †/Youshuanian	Idamean							494.9 *
	Miaolingian	Guzhangian								St Davids		Middle Cambrian		Guzhangian	Wangcunian †	Mindyallan					Marjumian	Albertian †	497
		Guzhangian												Guzhangian		Boomerangian							499
		Drumian												Drumian		Undillan							500.5
		Drumian												Drumian		Floran							503
		Wuliuan												Wuliuan/Taijangian		Templetonian					Topazan		504.5
																Templetonian					Delamaran		506.5
																Ordian							507.8 *
	Series 2	Stage 4								Caerfai		Early Cambrian		Duyunian		Ordian						Waucoban †	509
																							510.8 *
																					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