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 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of Ibero-Bohemia				Cambrian Epochs	Cambrian of Australia	Ordovician of China			Cambrian of North America
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Kosovian						Hirnantian	Xiaoxita †/Shikou	Wufeng †			443.8
		Katian		Rawtheyan			Kralodvorian	Bohdalec †					Chientangkiangian					445.2
				Cautleyan														448.9 *
				Pusgillian														449.3 *
				Pusgillian									Neichianshanian/Hanjiang					449.5
			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									Darriwilian	Guniu †/Hulo				458.4
							Dobrotivian											458.5 *
							Oretanian											459.7 *
				Abereiddian/Early Llanvirn														461.3 *
								Sarka †										461.7 *
								Sarka †						Hunjiang †	Dawan †/Daobaowan/Ningkuo			466.3 *
		Dapingian						Klabava †					Dapingian					467.3
							Arenigian											468
			Arenig	Fennian														468.4 *
	Early Ordovician	Floian		Fennian									Yiyangian					470
				Whitlandian														471.1 *
				Moridunian														474.3 *
		Tremadocian	Tremadoc	Migneintian			Tremadocian						Xinchangian					477.7
				Migneintian											Lianghekou †			477.9 *
				Cressagian														480.8 *
																		485 *
Cambrian	Furongian	Stage 10									Late Cambrian	Datsonian					Franconian †/Dresbachian/Millardan	485.4
												Payntonian						486.8 *
												Payntonian				Sunwaptan		487.5
		Jiangshanian										Iverian				Sunwaptan		489.5
		Jiangshanian										Iverian				Steptoean		493 *
		Paibian										Idamean				Steptoean		494
	Miaolingian	Guzhangian									Middle Cambrian	Mindyallan				Marjumian	Albertian †	497
		Guzhangian										Boomerangian						499
		Drumian										Undillan						500.5
		Drumian										Floran						503
		Wuliuan										Templetonian				Topazan		504.5
												Templetonian				Delamaran		506.5
												Ordian						507.8 *
	Series 2	Stage 4									Early Cambrian	Ordian					Waucoban †	509
																		510.8 *
																Dyeran		511 *
		Stage 3														Dyeran		514
																Montezuman		514.8 *
																Begadean		519.9 *
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																		538.8