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 China		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												Demingian †		482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian		Pakerort			Niuchehean	Taoyuanian †	Merioneth	Dolgellian/Trempealeauan							Batyrbaian	485.4
																			486.3 *
																			486.5
																			487.5
											Festiniogian								489.2 *
		Jiangshanian						Jiangshanian											489.5
																		Aksaian	490.7 *
																		Sakian	492.2 *
											Maentwrogian								493.1 *
		Paibian						Paibian											494
		Paibian						Paibian	Waergangian †/Youshuanian										494.9 *
	Miaolingian	Guzhangian	Middle Cambrian					Guzhangian	Wangcunian †	St Davids								Ayusokkanian	497
												Arcadian						Ayusokkanian	498.4
																			499.5
		Drumian						Drumian										Zhanaarykian	500.5
		Drumian						Drumian										Tuesaian	503
		Wuliuan						Wuliuan/Taijangian										Tuesaian	504.5
		Wuliuan						Wuliuan/Taijangian											505.3
	Series 2	Stage 4	Early Cambrian					Duyunian		Caerfai		Branchian							509
																		Toyonian	510 *
																		Botomian	512.5 *
		Stage 3						Nangaoian										Botomian	514
																		Atdabanian	515.6 *
												Placentian						Atdabanian	517.1
	Terreneuvian	Stage 2						Meishucunian										Tommotian	521
		Stage 2																	525.5
		Fortunian																	529
		Fortunian						Jinnigian											530.7
																			538.8