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		Ordovician of North America					Cambrian of Kazakhstan	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				Ungurian			477.7
						Stairsian							480.3 *
						Skullrockian			Demingian †				482 *
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan		Skullrockian				Batyrbaian		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