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 Britain		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	Merioneth	Dolgellian/Trempealeauan			Skullrockian				Batyrbaian	485.4
				Sunwaptan			Dolgellian/Trempealeauan								487.5
							Festiniogian								489.2 *
		Jiangshanian													489.5
														Aksaian	490.7 *
														Sakian	492.2 *
				Steptoean											493 *
							Maentwrogian								493.1 *
		Paibian					Maentwrogian								494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †	St Davids								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 †	Caerfai		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