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		Ordovician of North America					Cambrian of Britain		Cambrian of West Avalonia	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