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 North America		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		Franconian †/Dresbachian/Millardan	Niuchehean	Taoyuanian †	485.4
		Stage 10									Sunwaptan		Niuchehean		487.5
		Jiangshanian											Jiangshanian		489.5
								Aksaian							490.7 *
								Sakian							492.2 *
											Steptoean				493 *
		Paibian											Paibian		494
										Ensyan †/Maduan/Nganasanian					494.7 *
										Ensyan †/Maduan/Nganasanian				Waergangian †/Youshuanian	494.9 *
	Miaolingian	Guzhangian	Middle Cambrian					Ayusokkanian			Marjumian	Albertian †	Guzhangian	Wangcunian †	497
		Guzhangian						Mayan/Menevian					Guzhangian		499.5
		Drumian						Mayan/Menevian					Drumian		500.5
		Wuliuan						Amgan/Solvan			Topazan		Wuliuan/Taijangian		504.5
		Wuliuan									Delamaran		Wuliuan/Taijangian		506.5
	Series 2	Stage 4	Early Cambrian									Waucoban †	Duyunian		509
								Toyonian	Lenian †						510 *
								Toyonian			Dyeran				511 *
								Botomian							512.5 *
		Stage 3											Nangaoian		514
											Montezuman				514.8 *
								Atdabanian			Montezuman				515.6 *
								Atdabanian			Begadean				519.9 *
	Terreneuvian	Stage 2						Tommotian					Meishucunian		521
		Stage 2						Nemakit-Daldynian							525.5
		Fortunian							Manykaian †						529
		Fortunian							Manykaian †				Jinnigian		530.7
															538.8