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

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 West Avalonia	Ordovician of Britain				Cambrian of North America
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
					Tremadoc	Cressagian					480.8 *
											485 *
Cambrian	Furongian	Stage 10	Late Cambrian							Franconian †/Dresbachian/Millardan	485.4
		Stage 10							Sunwaptan		487.5
		Jiangshanian							Sunwaptan		489.5
		Jiangshanian							Steptoean		493 *
		Paibian							Steptoean		494
	Miaolingian	Guzhangian	Middle Cambrian						Marjumian	Albertian †	497
		Guzhangian		Arcadian							498.4
		Drumian									500.5
		Wuliuan							Topazan		504.5
		Wuliuan							Delamaran		506.5
	Series 2	Stage 4	Early Cambrian	Branchian					Delamaran	Waucoban †	509
		Stage 4							Dyeran		511 *
		Stage 3							Dyeran		514
									Montezuman		514.8 *
				Placentian					Montezuman		517.1
									Begadean		519.9 *
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
											538.8