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

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian of North America		Cambrian Epochs	Ordovician of North America					Cambrian of Australia	Cambrian of West Avalonia
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	Late Cambrian						Datsonian		485.4
											Payntonian		486.8 *
			Sunwaptan								Payntonian		487.5
		Jiangshanian	Sunwaptan								Iverian		489.5
		Jiangshanian	Steptoean								Iverian		493 *
		Paibian	Steptoean								Idamean		494
	Miaolingian	Guzhangian	Marjumian	Albertian †	Middle Cambrian						Mindyallan		497
											Mindyallan	Arcadian	498.4
											Boomerangian		499
		Drumian									Undillan		500.5
		Drumian									Floran		503
		Wuliuan	Topazan								Templetonian		504.5
			Delamaran								Templetonian		506.5
											Ordian		507.8 *
	Series 2	Stage 4		Waucoban †	Early Cambrian						Ordian	Branchian	509
													510.8 *
			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