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 West Avalonia	Ordovician of North America					Cambrian of China		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				Niuchehean	Taoyuanian †	Late Cambrian	485.4
		Stage 10	Sunwaptan								Niuchehean			487.5
		Jiangshanian	Sunwaptan								Jiangshanian			489.5
		Jiangshanian	Steptoean								Jiangshanian			493 *
		Paibian									Paibian			494
		Paibian									Paibian	Waergangian †/Youshuanian		494.9 *
	Miaolingian	Guzhangian	Marjumian	Albertian †							Guzhangian	Wangcunian †	Middle Cambrian	497
		Guzhangian			Arcadian						Guzhangian			498.4
		Drumian									Drumian			500.5
		Wuliuan	Topazan								Wuliuan/Taijangian			504.5
		Wuliuan	Delamaran								Wuliuan/Taijangian			506.5
	Series 2	Stage 4	Delamaran	Waucoban †	Branchian						Duyunian		Early Cambrian	509
		Stage 4	Dyeran								Duyunian			511 *
		Stage 3	Dyeran								Nangaoian			514
			Montezuman											514.8 *
			Montezuman		Placentian									517.1
			Begadean											519.9 *
	Terreneuvian	Stage 2									Meishucunian			521
		Fortunian									Meishucunian			529
		Fortunian									Jinnigian			530.7
														538.8