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		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						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