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 China			Ordovician of Australia	Ordovician of Ibero-Bohemia				Cambrian of North America		Cambrian Epochs
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														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