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
D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 Siberia			Ordovician of the Baltic				Cambrian of Britain		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												482.2 *
				Mansian †																483.55 *
Cambrian	Furongian	Stage 10	Late Cambrian	Batyrbaian	Tavgian †	Ketyan †/Yurakian					Merioneth	Dolgellian/Trempealeauan							Batyrbaian	485.4
																				486.3 *
																				486.5
																				487.5
												Festiniogian								489.2 *
		Jiangshanian																		489.5
				Aksaian															Aksaian	490.7 *
				Sakian															Sakian	492.2 *
												Maentwrogian								493.1 *
		Paibian																		494
		Paibian				Ensyan †/Maduan/Nganasanian														494.7 *
	Miaolingian	Guzhangian	Middle Cambrian	Ayusokkanian							St Davids								Ayusokkanian	497
				Ayusokkanian									Arcadian						Ayusokkanian	498.4
				Mayan/Menevian																499.5
		Drumian																	Zhanaarykian	500.5
		Drumian																	Tuesaian	503
		Wuliuan		Amgan/Solvan															Tuesaian	504.5
		Wuliuan																		505.3
	Series 2	Stage 4	Early Cambrian								Caerfai		Branchian							509
				Toyonian	Lenian †														Toyonian	510 *
				Botomian															Botomian	512.5 *
		Stage 3		Botomian															Botomian	514
				Atdabanian															Atdabanian	515.6 *
				Atdabanian									Placentian						Atdabanian	517.1
	Terreneuvian	Stage 2		Tommotian															Tommotian	521
		Stage 2		Nemakit-Daldynian																525.5
		Fortunian		Nemakit-Daldynian	Manykaian †															529
																				538.8