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
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
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.

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 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			Skullrockian				Batyrbaian	485.4
		Stage 10									487.5
		Jiangshanian									489.5
										Aksaian	490.7 *
										Sakian	492.2 *
		Paibian								Sakian	494
	Miaolingian	Guzhangian	Middle Cambrian							Ayusokkanian	497
				Arcadian						Ayusokkanian	498.4
											499.5
		Drumian								Zhanaarykian	500.5
		Drumian								Tuesaian	503
		Wuliuan								Tuesaian	504.5
		Wuliuan									505.3
	Series 2	Stage 4	Early Cambrian	Branchian							509
										Toyonian	510 *
										Botomian	512.5 *
		Stage 3								Botomian	514
										Atdabanian	515.6 *
				Placentian						Atdabanian	517.1
	Terreneuvian	Stage 2								Tommotian	521
		Stage 2									525.5
		Fortunian									529
											538.8