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 West Avalonia	Cambrian of Australia	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		Datsonian						Batyrbaian	485.4
							Payntonian							486.8 *
				Sunwaptan			Payntonian							487.5
		Jiangshanian					Iverian							489.5
													Aksaian	490.7 *
													Sakian	492.2 *
				Steptoean										493 *
		Paibian		Steptoean			Idamean							494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †		Mindyallan						Ayusokkanian	497
						Arcadian	Mindyallan							498.4
							Boomerangian							499
							Boomerangian							499.5
		Drumian					Undillan						Zhanaarykian	500.5
		Drumian					Floran						Tuesaian	503
		Wuliuan		Topazan			Templetonian						Tuesaian	504.5
				Topazan										505.3
				Delamaran										506.5
							Ordian							507.8 *
	Series 2	Stage 4	Early Cambrian		Waucoban †	Branchian								509
													Toyonian	510 *
														510.8 *
				Dyeran										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