PBDB Timescale

Cambrian Epochs

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

F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 594 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Cambrian of Siberia			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					Tremadoc	Migneintian			477.7
								Cressagian			480.8 *
				Mansian †				Cressagian			483.55 *
				Mansian †							485 *
Cambrian	Furongian	Stage 10	Late Cambrian	Batyrbaian	Tavgian †	Ketyan †/Yurakian					485.4
		Jiangshanian		Batyrbaian							489.5
				Aksaian							490.7 *
				Sakian							492.2 *
		Paibian									494
		Paibian				Ensyan †/Maduan/Nganasanian					494.7 *
	Miaolingian	Guzhangian	Middle Cambrian	Ayusokkanian							497
		Guzhangian		Mayan/Menevian							499.5
		Drumian		Mayan/Menevian							500.5
		Wuliuan		Amgan/Solvan							504.5
	Series 2	Stage 4	Early Cambrian	Amgan/Solvan							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