PBDB Timescale

Cambrian of North America

The interval definitions in this timescale are derived from the following sources:

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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 1827 collections

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International Chronostratigraphic Timescale			Cambrian of North America		Ordovician of North America					Cambrian of West Avalonia	Cambrian Epochs
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		Franconian †/Dresbachian/Millardan		Skullrockian					Late Cambrian	485.4
		Stage 10	Sunwaptan									487.5
		Jiangshanian	Sunwaptan									489.5
		Jiangshanian	Steptoean									493 *
		Paibian	Steptoean									494
	Miaolingian	Guzhangian	Marjumian	Albertian †							Middle Cambrian	497
		Guzhangian								Arcadian		498.4
		Drumian										500.5
		Wuliuan	Topazan									504.5
		Wuliuan	Delamaran									506.5
	Series 2	Stage 4	Delamaran	Waucoban †						Branchian	Early Cambrian	509
		Stage 4	Dyeran									511 *
		Stage 3	Dyeran									514
			Montezuman									514.8 *
			Montezuman							Placentian		517.1
			Begadean									519.9 *
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
												538.8