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	Cambrian of West Avalonia	Ordovician of Britain				Ordovician of North America
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								477.7
						Migneintian				Stairsian				480.3 *
						Cressagian				Stairsian				480.8 *
						Cressagian				Skullrockian			Demingian †	482 *
													Demingian †	485 *
Cambrian	Furongian	Stage 10	Late Cambrian											485.4
		Stage 10												487.5
		Jiangshanian												489.5
		Paibian												494
	Miaolingian	Guzhangian	Middle Cambrian											497
		Guzhangian		Arcadian										498.4
		Drumian												500.5
		Wuliuan												504.5
	Series 2	Stage 4	Early Cambrian	Branchian										509
		Stage 3		Branchian										514
		Stage 3		Placentian										517.1
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
														538.8