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

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.

This timescale is used in the definition of 594 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Cambrian of Kazakhstan	Cambrian of Australia	Cambrian of Britain		Cambrian of West Avalonia
Ordovician	Early Ordovician	Tremadocian		Ungurian					477.7
Cambrian	Furongian	Stage 10	Late Cambrian	Batyrbaian	Datsonian	Merioneth	Dolgellian/Trempealeauan		485.4
					Payntonian		Dolgellian/Trempealeauan		486.8 *
					Payntonian		Festiniogian		489.2 *
		Jiangshanian			Iverian				489.5
				Aksaian					490.7 *
				Sakian					492.2 *
							Maentwrogian		493.1 *
		Paibian			Idamean		Maentwrogian		494
	Miaolingian	Guzhangian	Middle Cambrian	Ayusokkanian	Mindyallan	St Davids			497
					Mindyallan			Arcadian	498.4
					Boomerangian				499
					Boomerangian				499.5
		Drumian		Zhanaarykian	Undillan				500.5
		Drumian		Tuesaian	Floran				503
		Wuliuan		Tuesaian	Templetonian				504.5
					Templetonian				505.3
					Ordian				507.8 *
	Series 2	Stage 4	Early Cambrian			Caerfai		Branchian	509
				Toyonian					510 *
				Toyonian					510.8 *
				Botomian					512.5 *
		Stage 3		Botomian					514
				Atdabanian					515.6 *
				Atdabanian				Placentian	517.1
	Terreneuvian	Stage 2		Tommotian					521
		Stage 2							525.5
		Fortunian							529
									538.8