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
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		Cambrian of Kazakhstan	Cambrian of North America		Ordovician of North America
Ordovician	Late Ordovician	Hirnantian							Cincinnatian	Gamachian				443.8
		Katian								Gamachian				445.2
										Richmondian				446 *
										Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian			449.8 *
										Edenian				450.4 *
									Mohawkian	Chatfieldian				451.1 *
		Sandbian								Chatfieldian				453
										Turinian				453.7 *
									Whiterockian		Canadian †	Chazyan †/Marmor		457 *
	Middle Ordovician	Darriwilian												458.4
		Dapingian												467.3
		Dapingian								Rangerian				469.1 *
	Early Ordovician	Floian							Ibexian	Blackhillsian		Jeffersonian †	Cassinian †	470
		Floian								Tulean				473.9 *
		Tremadocian				Ungurian				Tulean				477.7
										Stairsian				480.3 *
										Skullrockian			Demingian †	482 *
Cambrian	Furongian	Stage 10	Late Cambrian	Merioneth	Dolgellian/Trempealeauan	Batyrbaian		Franconian †/Dresbachian/Millardan		Skullrockian				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		Ayusokkanian	Marjumian	Albertian †						497
		Guzhangian												499.5
		Drumian				Zhanaarykian								500.5
		Drumian				Tuesaian								503
		Wuliuan				Tuesaian	Topazan							504.5
							Topazan							505.3
							Delamaran							506.5
	Series 2	Stage 4	Early Cambrian	Caerfai				Waucoban †						509
						Toyonian								510 *
						Toyonian	Dyeran							511 *
						Botomian								512.5 *
		Stage 3												514
							Montezuman							514.8 *
						Atdabanian	Montezuman							515.6 *
						Atdabanian	Begadean							519.9 *
	Terreneuvian	Stage 2				Tommotian								521
		Stage 2												525.5
		Fortunian												529
														538.8