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		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					Tulean				477.7
							Stairsian				480.3 *
							Skullrockian			Demingian †	482 *
Cambrian	Furongian	Stage 10	Late Cambrian		Franconian †/Dresbachian/Millardan		Skullrockian				485.4
		Stage 10		Sunwaptan							487.5
		Jiangshanian		Sunwaptan							489.5
		Jiangshanian		Steptoean							493 *
		Paibian		Steptoean							494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †						497
		Drumian		Marjumian							500.5
		Wuliuan		Topazan							504.5
		Wuliuan		Delamaran							506.5
	Series 2	Stage 4	Early Cambrian	Delamaran	Waucoban †						509
		Stage 4		Dyeran							511 *
		Stage 3		Dyeran							514
				Montezuman							514.8 *
				Begadean							519.9 *
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
											538.8