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
M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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 North America		Cambrian of West Avalonia	Ordovician of North America					Cambrian of Kazakhstan
Ordovician	Late Ordovician	Hirnantian					Cincinnatian	Gamachian					443.8
		Katian						Gamachian					445.2
								Richmondian					446 *
								Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian				449.8 *
								Edenian					450.4 *
							Mohawkian	Chatfieldian					451.1 *
		Sandbian						Chatfieldian					453
								Turinian					453.7 *
							Whiterockian		Canadian †	Chazyan †/Marmor			457 *
	Middle Ordovician	Darriwilian											458.4
		Dapingian											467.3
		Dapingian						Rangerian					469.1 *
	Early Ordovician	Floian					Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		470
		Floian						Tulean					473.9 *
		Tremadocian						Tulean				Ungurian	477.7
								Stairsian					480.3 *
								Skullrockian			Demingian †		482 *
Cambrian	Furongian	Stage 10	Late Cambrian		Franconian †/Dresbachian/Millardan			Skullrockian				Batyrbaian	485.4
		Stage 10		Sunwaptan									487.5
		Jiangshanian											489.5
												Aksaian	490.7 *
												Sakian	492.2 *
				Steptoean									493 *
		Paibian		Steptoean									494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †							Ayusokkanian	497
						Arcadian						Ayusokkanian	498.4
													499.5
		Drumian										Zhanaarykian	500.5
		Drumian										Tuesaian	503
		Wuliuan		Topazan								Tuesaian	504.5
				Topazan									505.3
				Delamaran									506.5
	Series 2	Stage 4	Early Cambrian		Waucoban †	Branchian							509
												Toyonian	510 *
				Dyeran								Toyonian	511 *
												Botomian	512.5 *
		Stage 3											514
				Montezuman									514.8 *
												Atdabanian	515.6 *
						Placentian							517.1
				Begadean									519.9 *
	Terreneuvian	Stage 2										Tommotian	521
		Stage 2											525.5
		Fortunian											529
													538.8