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
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

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	Ordovician of Britain				Cambrian of Siberia			Cambrian of China
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 *
					Cressagian			Mansian †					483.55 *
								Mansian †					485 *
Cambrian	Furongian	Stage 10	Late Cambrian					Batyrbaian	Tavgian †	Ketyan †/Yurakian	Niuchehean	Taoyuanian †	485.4
		Jiangshanian						Batyrbaian			Jiangshanian		489.5
								Aksaian					490.7 *
								Sakian					492.2 *
		Paibian									Paibian		494
										Ensyan †/Maduan/Nganasanian			494.7 *
										Ensyan †/Maduan/Nganasanian		Waergangian †/Youshuanian	494.9 *
	Miaolingian	Guzhangian	Middle Cambrian					Ayusokkanian			Guzhangian	Wangcunian †	497
		Guzhangian						Mayan/Menevian			Guzhangian		499.5
		Drumian						Mayan/Menevian			Drumian		500.5
		Wuliuan						Amgan/Solvan			Wuliuan/Taijangian		504.5
	Series 2	Stage 4	Early Cambrian					Amgan/Solvan			Duyunian		509
								Toyonian	Lenian †				510 *
								Botomian					512.5 *
		Stage 3						Botomian			Nangaoian		514
		Stage 3						Atdabanian			Nangaoian		515.6 *
	Terreneuvian	Stage 2						Tommotian			Meishucunian		521
		Stage 2						Nemakit-Daldynian					525.5
		Fortunian							Manykaian †				529
		Fortunian							Manykaian †		Jinnigian		530.7
													538.8