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
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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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	Cambrian of Britain		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	Merioneth	Dolgellian/Trempealeauan						Franconian †/Dresbachian/Millardan							Batyrbaian	485.4
					Dolgellian/Trempealeauan					Sunwaptan									487.5
					Festiniogian														489.2 *
		Jiangshanian																	489.5
																		Aksaian	490.7 *
																		Sakian	492.2 *
										Steptoean									493 *
					Maentwrogian														493.1 *
		Paibian			Maentwrogian														494
	Miaolingian	Guzhangian	Middle Cambrian	St Davids						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	Caerfai							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