PBDB Timescale

Cambrian Epochs

The interval definitions in this timescale are derived from the following sources:

F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
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
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
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 594 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Cambrian of North America		Ordovician of North America					Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian				Cincinnatian	Gamachian				Ashgill	Hirnantian			443.8
		Katian					Gamachian					Rawtheyan			445.2
							Richmondian					Rawtheyan			446 *
												Cautleyan			448.9 *
												Pusgillian			449.3 *
											Caradoc	Streffordian	Onnian †		449.6 *
							Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian							449.8 *
							Edenian								450.4 *
						Mohawkian	Chatfieldian								451.1 *
												Cheneyan			451.5 *
												Burrellian			452.7 *
		Sandbian													453
													Actonian †		453.2 *
							Turinian						Actonian †		453.7 *
													Marshbrookian †	Woolstonian †	454.2 *
													Longvillian †		455.2 *
												Aurelucian			456.8 *
						Whiterockian		Canadian †	Chazyan †/Marmor						457 *
													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
											Arenig	Fennian			468.4 *
							Rangerian								469.1 *
	Early Ordovician	Floian				Ibexian	Blackhillsian		Jeffersonian †	Cassinian †					470
							Blackhillsian					Whitlandian			471.1 *
							Tulean					Whitlandian			473.9 *
												Moridunian			474.3 *
		Tremadocian									Tremadoc	Migneintian			477.7
							Stairsian					Migneintian			480.3 *
							Stairsian					Cressagian			480.8 *
							Skullrockian			Demingian †		Cressagian			482 *
										Demingian †					485 *
Cambrian	Furongian	Stage 10	Late Cambrian		Franconian †/Dresbachian/Millardan										485.4
		Stage 10		Sunwaptan											487.5
		Jiangshanian		Sunwaptan											489.5
		Jiangshanian		Steptoean											493 *
		Paibian		Steptoean											494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †										497
		Drumian		Marjumian											500.5
		Wuliuan		Topazan											504.5
		Wuliuan		Delamaran											506.5
	Series 2	Stage 4	Early Cambrian	Delamaran	Waucoban †										509
		Stage 4		Dyeran											511 *
		Stage 3		Dyeran											514
				Montezuman											514.8 *
				Begadean											519.9 *
	Terreneuvian	Stage 2													521
	Terreneuvian	Fortunian													529
															538.8