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	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
		Guzhangian								499.5
		Drumian							Zhanaarykian	500.5
		Drumian							Tuesaian	503
		Wuliuan							Tuesaian	504.5
		Wuliuan								505.3
	Series 2	Stage 4	Early Cambrian							509
									Toyonian	510 *
									Botomian	512.5 *
		Stage 3							Botomian	514
		Stage 3							Atdabanian	515.6 *
	Terreneuvian	Stage 2							Tommotian	521
		Stage 2								525.5
		Fortunian								529
										538.8