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 the Baltic				Cambrian of North America		Cambrian of West Avalonia	Ordovician of North America					Cambrian of Kazakhstan
Ordovician	Late Ordovician	Hirnantian		Harju	Porkuni						Cincinnatian	Gamachian					443.8
		Katian			Pirgu							Gamachian					445.2
					Pirgu							Richmondian					446 *
					Vormsi							Richmondian					449.6 *
					Vormsi							Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian				449.8 *
					Nabala	Johvi †						Maysvillian					450 *
					Nabala							Edenian					450.4 *
				Viru	Rakvere							Edenian					450.6 *
					Rakvere						Mohawkian	Chatfieldian					451.1 *
					Oandu												452 *
		Sandbian			Keila	Idavere †											453
					Keila							Turinian					453.7 *
					Haljala												453.9
					Kukruse												456.4 *
					Kukruse						Whiterockian		Canadian †	Chazyan †/Marmor			457 *
					Uhaku	Aluoja †											457.5 *
	Middle Ordovician	Darriwilian			Uhaku												458.4
					Lasnamagi												458.9 *
					Aseri												460.4 *
				Oeland	Kunda												462.9 *
					Kunda	Valaste †/Hunderum											464.3 *
					Volkhov		Langevoja †/Vaana/Saka										467.1 *
		Dapingian															467.3
												Rangerian					469.1 *
					Billingen							Rangerian					469.3 *
	Early Ordovician	Floian									Ibexian	Blackhillsian		Jeffersonian †	Cassinian †		470
						Latorp †											470.1 *
					Hunneberg												473.7 *
												Tulean					473.9 *
		Tremadocian										Tulean				Ungurian	477.7
												Stairsian					480.3 *
					Varangu							Stairsian					481.3 *
					Varangu							Skullrockian			Demingian †		482 *
					Pakerort										Demingian †		482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian		Pakerort				Franconian †/Dresbachian/Millardan							Batyrbaian	485.4
																	486.3 *
																	486.5
								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