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		Cambrian of Kazakhstan	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			Ungurian		Tulean						477.7
							Stairsian						480.3 *
							Skullrockian			Demingian †			482 *
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan	Batyrbaian		Skullrockian					Late Cambrian	485.4
		Stage 10	Sunwaptan										487.5
		Jiangshanian											489.5
					Aksaian								490.7 *
					Sakian								492.2 *
			Steptoean										493 *
		Paibian	Steptoean										494
	Miaolingian	Guzhangian	Marjumian	Albertian †	Ayusokkanian							Middle Cambrian	497
					Ayusokkanian						Arcadian		498.4
													499.5
		Drumian			Zhanaarykian								500.5
		Drumian			Tuesaian								503
		Wuliuan	Topazan		Tuesaian								504.5
			Topazan										505.3
			Delamaran										506.5
	Series 2	Stage 4		Waucoban †							Branchian	Early Cambrian	509
					Toyonian								510 *
			Dyeran		Toyonian								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