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 Australia	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	Datsonian					485.4
		Stage 10		Payntonian					486.8 *
		Jiangshanian		Iverian					489.5
		Paibian		Idamean					494
	Miaolingian	Guzhangian	Middle Cambrian	Mindyallan					497
		Guzhangian		Boomerangian					499
		Drumian		Undillan					500.5
		Drumian		Floran					503
		Wuliuan		Templetonian					504.5
		Wuliuan		Ordian					507.8 *
	Series 2	Stage 4	Early Cambrian	Ordian					509
		Stage 4							510.8 *
		Stage 3							514
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian							529
									538.8