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 Kazakhstan	Cambrian of North America		Cambrian of West Avalonia	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	Batyrbaian		Franconian †/Dresbachian/Millardan			Skullrockian				485.4
		Stage 10			Sunwaptan								487.5
		Jiangshanian											489.5
				Aksaian									490.7 *
				Sakian									492.2 *
					Steptoean								493 *
		Paibian			Steptoean								494
	Miaolingian	Guzhangian	Middle Cambrian	Ayusokkanian	Marjumian	Albertian †							497
				Ayusokkanian			Arcadian						498.4
													499.5
		Drumian		Zhanaarykian									500.5
		Drumian		Tuesaian									503
		Wuliuan		Tuesaian	Topazan								504.5
					Topazan								505.3
					Delamaran								506.5
	Series 2	Stage 4	Early Cambrian			Waucoban †	Branchian						509
				Toyonian									510 *
				Toyonian	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