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		Ordovician of the Baltic				Cambrian of Kazakhstan	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian			Harju	Porkuni				Ashgill	Hirnantian			443.8
		Katian				Pirgu					Rawtheyan			445.2
											Cautleyan			448.9 *
											Pusgillian			449.3 *
						Vormsi				Caradoc	Streffordian	Onnian †		449.6 *
						Nabala	Johvi †							450 *
					Viru	Rakvere								450.6 *
						Rakvere					Cheneyan			451.5 *
						Oandu					Cheneyan			452 *
						Oandu					Burrellian			452.7 *
		Sandbian				Keila	Idavere †							453
						Keila						Actonian †		453.2 *
						Haljala						Actonian †		453.9
												Marshbrookian †	Woolstonian †	454.2 *
												Longvillian †		455.2 *
						Kukruse								456.4 *
											Aurelucian			456.8 *
												Soudleyan †/Harnagian/Costonian		457.4 *
						Uhaku	Aluoja †					Soudleyan †/Harnagian/Costonian		457.5 *
	Middle Ordovician	Darriwilian				Uhaku				Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
						Lasnamagi								458.9 *
						Aseri								460.4 *
						Aseri					Abereiddian/Early Llanvirn			461.3 *
					Oeland	Kunda								462.9 *
						Kunda	Valaste †/Hunderum							464.3 *
						Volkhov		Langevoja †/Vaana/Saka						467.1 *
		Dapingian												467.3
										Arenig	Fennian			468.4 *
						Billingen								469.3 *
	Early Ordovician	Floian												470
							Latorp †							470.1 *
											Whitlandian			471.1 *
						Hunneberg					Whitlandian			473.7 *
											Moridunian			474.3 *
		Tremadocian							Ungurian	Tremadoc	Migneintian			477.7
											Cressagian			480.8 *
						Varangu								481.3 *
						Pakerort								482.2 *
														485 *
Cambrian	Furongian	Stage 10	Merioneth	Dolgellian/Trempealeauan					Batyrbaian					485.4
														486.3 *
														486.5
				Festiniogian										489.2 *
		Jiangshanian												489.5
									Aksaian					490.7 *
									Sakian					492.2 *
				Maentwrogian										493.1 *
		Paibian		Maentwrogian										494
	Miaolingian	Guzhangian	St Davids						Ayusokkanian					497
		Guzhangian												499.5
		Drumian							Zhanaarykian					500.5
		Drumian							Tuesaian					503
		Wuliuan							Tuesaian					504.5
		Wuliuan												505.3
	Series 2	Stage 4	Caerfai											509
									Toyonian					510 *
									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