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 China		Cambrian of Australia	Cambrian of West Avalonia	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
								Tremadoc	Cressagian			480.8 *
												485 *
Cambrian	Furongian	Stage 10	Late Cambrian	Niuchehean	Taoyuanian †	Datsonian						485.4
		Stage 10		Niuchehean		Payntonian						486.8 *
		Jiangshanian		Jiangshanian		Iverian						489.5
		Paibian		Paibian		Idamean						494
		Paibian		Paibian	Waergangian †/Youshuanian	Idamean						494.9 *
	Miaolingian	Guzhangian	Middle Cambrian	Guzhangian	Wangcunian †	Mindyallan						497
						Mindyallan	Arcadian					498.4
						Boomerangian						499
		Drumian		Drumian		Undillan						500.5
		Drumian		Drumian		Floran						503
		Wuliuan		Wuliuan/Taijangian		Templetonian						504.5
		Wuliuan		Wuliuan/Taijangian		Ordian						507.8 *
	Series 2	Stage 4	Early Cambrian	Duyunian		Ordian	Branchian					509
		Stage 4		Duyunian								510.8 *
		Stage 3		Nangaoian								514
		Stage 3		Nangaoian			Placentian					517.1
	Terreneuvian	Stage 2		Meishucunian								521
		Fortunian		Meishucunian								529
		Fortunian		Jinnigian								530.7
												538.8