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 North America		Cambrian of Kazakhstan	Ordovician of North America
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						Ungurian		Tulean				477.7
										Stairsian				480.3 *
										Skullrockian			Demingian †	482 *
Cambrian	Furongian	Stage 10	Late Cambrian	Niuchehean	Taoyuanian †		Franconian †/Dresbachian/Millardan	Batyrbaian		Skullrockian				485.4
		Stage 10		Niuchehean		Sunwaptan								487.5
		Jiangshanian		Jiangshanian										489.5
								Aksaian						490.7 *
								Sakian						492.2 *
						Steptoean								493 *
		Paibian		Paibian										494
		Paibian		Paibian	Waergangian †/Youshuanian									494.9 *
	Miaolingian	Guzhangian	Middle Cambrian	Guzhangian	Wangcunian †	Marjumian	Albertian †	Ayusokkanian						497
		Guzhangian		Guzhangian										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			Waucoban †							509
								Toyonian						510 *
						Dyeran		Toyonian						511 *
								Botomian						512.5 *
		Stage 3		Nangaoian										514
						Montezuman								514.8 *
						Montezuman		Atdabanian						515.6 *
						Begadean		Atdabanian						519.9 *
	Terreneuvian	Stage 2		Meishucunian				Tommotian						521
		Stage 2												525.5
		Fortunian												529
		Fortunian		Jinnigian										530.7
														538.8