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 China		Cambrian of Britain		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	Niuchehean	Taoyuanian †	Merioneth	Dolgellian/Trempealeauan		Franconian †/Dresbachian/Millardan			Skullrockian				Batyrbaian	485.4
							Dolgellian/Trempealeauan	Sunwaptan									487.5
							Festiniogian										489.2 *
		Jiangshanian		Jiangshanian													489.5
																Aksaian	490.7 *
																Sakian	492.2 *
								Steptoean									493 *
							Maentwrogian										493.1 *
		Paibian		Paibian													494
		Paibian		Paibian	Waergangian †/Youshuanian												494.9 *
	Miaolingian	Guzhangian	Middle Cambrian	Guzhangian	Wangcunian †	St Davids		Marjumian	Albertian †							Ayusokkanian	497
										Arcadian						Ayusokkanian	498.4
																	499.5
		Drumian		Drumian												Zhanaarykian	500.5
		Drumian		Drumian												Tuesaian	503
		Wuliuan		Wuliuan/Taijangian				Topazan								Tuesaian	504.5
								Topazan									505.3
								Delamaran									506.5
	Series 2	Stage 4	Early Cambrian	Duyunian		Caerfai			Waucoban †	Branchian							509
																Toyonian	510 *
								Dyeran								Toyonian	511 *
																Botomian	512.5 *
		Stage 3		Nangaoian													514
								Montezuman									514.8 *
																Atdabanian	515.6 *
										Placentian							517.1
								Begadean									519.9 *
	Terreneuvian	Stage 2		Meishucunian												Tommotian	521
		Stage 2															525.5
		Fortunian															529
		Fortunian		Jinnigian													530.7
																	538.8