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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 594 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Ordovician of Britain				Cambrian of North America		Cambrian of West Avalonia	Ordovician of North America					Cambrian of Kazakhstan
Ordovician	Late Ordovician	Hirnantian		Ashgill	Hirnantian						Cincinnatian	Gamachian					443.8
		Katian			Rawtheyan							Gamachian					445.2
					Rawtheyan							Richmondian					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 *
						Actonian †						Turinian					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
					Whitlandian							Blackhillsian					471.1 *
					Whitlandian							Tulean					473.9 *
					Moridunian												474.3 *
		Tremadocian		Tremadoc	Migneintian											Ungurian	477.7
					Migneintian							Stairsian					480.3 *
					Cressagian							Stairsian					480.8 *
					Cressagian							Skullrockian			Demingian †		482 *
															Demingian †		485 *
Cambrian	Furongian	Stage 10	Late Cambrian						Franconian †/Dresbachian/Millardan							Batyrbaian	485.4
		Stage 10						Sunwaptan									487.5
		Jiangshanian															489.5
																Aksaian	490.7 *
																Sakian	492.2 *
								Steptoean									493 *
		Paibian						Steptoean									494
	Miaolingian	Guzhangian	Middle Cambrian					Marjumian	Albertian †							Ayusokkanian	497
										Arcadian						Ayusokkanian	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	Early Cambrian						Waucoban †	Branchian							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