PBDB Timescale

Cambrian of Britain

The interval definitions in this timescale are derived from the following sources:

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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view

There are 12 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 602 collections

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International Chronostratigraphic Timescale			Cambrian of Britain		Cambrian of Siberia			Cambrian of Kazakhstan	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian							Ashgill	Hirnantian			443.8
		Katian								Rawtheyan			445.2
										Cautleyan			448.9 *
										Pusgillian			449.3 *
									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			458.4
		Darriwilian								Abereiddian/Early Llanvirn			461.3 *
		Dapingian								Abereiddian/Early Llanvirn			467.3
		Dapingian							Arenig	Fennian			468.4 *
	Early Ordovician	Floian								Fennian			470
										Whitlandian			471.1 *
										Moridunian			474.3 *
		Tremadocian						Ungurian	Tremadoc	Migneintian			477.7
										Cressagian			480.8 *
					Mansian †					Cressagian			483.55 *
					Mansian †								485 *
Cambrian	Furongian	Stage 10	Merioneth	Dolgellian/Trempealeauan	Batyrbaian	Tavgian †	Ketyan †/Yurakian	Batyrbaian					485.4
		Stage 10		Festiniogian									489.2 *
		Jiangshanian											489.5
					Aksaian			Aksaian					490.7 *
					Sakian			Sakian					492.2 *
				Maentwrogian									493.1 *
		Paibian											494
		Paibian					Ensyan †/Maduan/Nganasanian						494.7 *
	Miaolingian	Guzhangian	St Davids		Ayusokkanian			Ayusokkanian					497
		Guzhangian			Mayan/Menevian								499.5
		Drumian						Zhanaarykian					500.5
		Drumian						Tuesaian					503
		Wuliuan			Amgan/Solvan			Tuesaian					504.5
		Wuliuan											505.3
	Series 2	Stage 4	Caerfai										509
					Toyonian	Lenian †		Toyonian					510 *
					Botomian			Botomian					512.5 *
		Stage 3			Botomian			Botomian					514
		Stage 3			Atdabanian			Atdabanian					515.6 *
	Terreneuvian	Stage 2			Tommotian			Tommotian					521
		Stage 2			Nemakit-Daldynian								525.5
		Fortunian			Nemakit-Daldynian	Manykaian †							529
													538.8