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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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			Cambrian of Siberia			Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Hirnantian	Xiaoxita †/Shikou	Wufeng †					443.8
		Katian		Rawtheyan			Chientangkiangian							445.2
				Cautleyan										448.9 *
				Pusgillian										449.3 *
				Pusgillian			Neichianshanian/Hanjiang							449.5
			Caradoc	Streffordian	Onnian †									449.6 *
				Cheneyan										451.5 *
				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						458.4
				Abereiddian/Early Llanvirn				Guniu †/Hulo						461.3 *
								Hunjiang †	Dawan †/Daobaowan/Ningkuo					466.3 *
		Dapingian					Dapingian							467.3
		Dapingian	Arenig	Fennian			Dapingian							468.4 *
	Early Ordovician	Floian		Fennian			Yiyangian							470
				Whitlandian										471.1 *
				Moridunian										474.3 *
		Tremadocian	Tremadoc	Migneintian			Xinchangian							477.7
				Migneintian					Lianghekou †					477.9 *
				Cressagian										480.8 *
				Cressagian						Mansian †				483.55 *
										Mansian †				485 *
Cambrian	Furongian	Stage 10								Batyrbaian	Tavgian †	Ketyan †/Yurakian	Late Cambrian	485.4
		Jiangshanian								Batyrbaian				489.5
										Aksaian				490.7 *
										Sakian				492.2 *
		Paibian												494
		Paibian										Ensyan †/Maduan/Nganasanian		494.7 *
	Miaolingian	Guzhangian								Ayusokkanian			Middle Cambrian	497
		Guzhangian								Mayan/Menevian				499.5
		Drumian								Mayan/Menevian				500.5
		Wuliuan								Amgan/Solvan				504.5
	Series 2	Stage 4								Amgan/Solvan			Early Cambrian	509
										Toyonian	Lenian †			510 *
										Botomian				512.5 *
		Stage 3								Botomian				514
		Stage 3								Atdabanian				515.6 *
	Terreneuvian	Stage 2								Tommotian				521
		Stage 2								Nemakit-Daldynian				525.5
		Fortunian								Nemakit-Daldynian	Manykaian †			529
														538.8