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				Ordovician of China			Cambrian Epochs	Cambrian of Siberia			Ordovician of Australia	Cambrian of North America
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †					Bolindian			443.8
		Katian		Rawtheyan			Chientangkiangian										445.2
				Cautleyan													448.9 *
				Cautleyan										Eastonian			449 *
				Pusgillian													449.3 *
				Pusgillian			Neichianshanian/Hanjiang										449.5
			Caradoc	Streffordian	Onnian †												449.6 *
				Cheneyan													451.5 *
				Cheneyan										Gisbornian			452 *
				Burrellian													452.7 *
		Sandbian															453
					Actonian †												453.2 *
					Marshbrookian †	Woolstonian †											454.2 *
					Longvillian †												455.2 *
				Aurelucian	Longvillian †												456.8 *
				Aurelucian	Soudleyan †/Harnagian/Costonian												457.4 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			Darriwilian	Guniu †/Hulo						Darriwilian			458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo									461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo								466.3 *
		Dapingian					Dapingian							Yapeenian			467.3
			Arenig	Fennian										Yapeenian			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										477.7
				Migneintian					Lianghekou †								477.9 *
				Cressagian													480.8 *
														Warendian			482.8 *
											Mansian †						483.55 *
											Mansian †						485 *
Cambrian	Furongian	Stage 10								Late Cambrian	Batyrbaian	Tavgian †	Ketyan †/Yurakian			Franconian †/Dresbachian/Millardan	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								Middle Cambrian	Ayusokkanian				Marjumian	Albertian †	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								Early Cambrian						Waucoban †	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