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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 Britain				Cambrian of China		Cambrian of West Avalonia	Cambrian Epochs
Ordovician	Late Ordovician	Hirnantian			Ashgill	Hirnantian							443.8
		Katian				Rawtheyan							445.2
						Cautleyan							448.9 *
						Pusgillian							449.3 *
					Caradoc	Streffordian	Onnian †						449.6 *
						Cheneyan							451.5 *
						Burrellian							452.7 *
		Sandbian											453
							Actonian †						453.2 *
							Marshbrookian †	Woolstonian †					454.2 *
							Longvillian †						455.2 *
						Aurelucian	Longvillian †						456.8 *
						Aurelucian	Soudleyan †/Harnagian/Costonian						457.4 *
	Middle Ordovician	Darriwilian			Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn							458.4
		Darriwilian				Abereiddian/Early Llanvirn							461.3 *
		Dapingian				Abereiddian/Early Llanvirn							467.3
		Dapingian			Arenig	Fennian							468.4 *
	Early Ordovician	Floian				Fennian							470
						Whitlandian							471.1 *
						Moridunian							474.3 *
		Tremadocian			Tremadoc	Migneintian							477.7
					Tremadoc	Cressagian							480.8 *
													485 *
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan					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							Guzhangian		Arcadian		498.4
		Drumian							Drumian				500.5
		Wuliuan	Topazan						Wuliuan/Taijangian				504.5
		Wuliuan	Delamaran						Wuliuan/Taijangian				506.5
	Series 2	Stage 4	Delamaran	Waucoban †					Duyunian		Branchian	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