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
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 Kazakhstan	Cambrian of Australia	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
							Tremadoc	Cressagian			480.8 *
											485 *
Cambrian	Furongian	Stage 10	Merioneth	Dolgellian/Trempealeauan	Batyrbaian	Datsonian					485.4
				Dolgellian/Trempealeauan		Payntonian					486.8 *
				Festiniogian		Payntonian					489.2 *
		Jiangshanian				Iverian					489.5
					Aksaian						490.7 *
					Sakian						492.2 *
				Maentwrogian							493.1 *
		Paibian		Maentwrogian		Idamean					494
	Miaolingian	Guzhangian	St Davids		Ayusokkanian	Mindyallan					497
					Ayusokkanian	Boomerangian					499
						Boomerangian					499.5
		Drumian			Zhanaarykian	Undillan					500.5
		Drumian			Tuesaian	Floran					503
		Wuliuan			Tuesaian	Templetonian					504.5
						Templetonian					505.3
						Ordian					507.8 *
	Series 2	Stage 4	Caerfai								509
					Toyonian						510 *
					Toyonian						510.8 *
					Botomian						512.5 *
		Stage 3			Botomian						514
		Stage 3			Atdabanian						515.6 *
	Terreneuvian	Stage 2			Tommotian						521
		Stage 2									525.5
		Fortunian									529
											538.8