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
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
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

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 West Avalonia	Ordovician of North America					Ordovician of the Baltic				Cambrian of North America		Cambrian of Australia
Ordovician	Late Ordovician	Hirnantian			Cincinnatian	Gamachian				Harju	Porkuni						443.8
		Katian				Gamachian					Pirgu						445.2
						Richmondian					Pirgu						446 *
						Richmondian					Vormsi						449.6 *
						Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian				Vormsi						449.8 *
						Maysvillian					Nabala	Johvi †					450 *
						Edenian					Nabala						450.4 *
						Edenian				Viru	Rakvere						450.6 *
					Mohawkian	Chatfieldian					Rakvere						451.1 *
											Oandu						452 *
		Sandbian									Keila	Idavere †					453
						Turinian					Keila						453.7 *
											Haljala						453.9
											Kukruse						456.4 *
					Whiterockian		Canadian †	Chazyan †/Marmor			Kukruse						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 *
						Rangerian					Billingen						469.3 *
	Early Ordovician	Floian			Ibexian	Blackhillsian		Jeffersonian †	Cassinian †								470
												Latorp †					470.1 *
											Hunneberg						473.7 *
						Tulean											473.9 *
		Tremadocian				Tulean											477.7
						Stairsian											480.3 *
						Stairsian					Varangu						481.3 *
						Skullrockian			Demingian †		Varangu						482 *
									Demingian †		Pakerort						482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian								Pakerort				Franconian †/Dresbachian/Millardan	Datsonian	485.4
																	486.3 *
																	486.5
																Payntonian	486.8 *
														Sunwaptan		Payntonian	487.5
		Jiangshanian												Sunwaptan		Iverian	489.5
		Jiangshanian												Steptoean		Iverian	493 *
		Paibian												Steptoean		Idamean	494
	Miaolingian	Guzhangian	Middle Cambrian											Marjumian	Albertian †	Mindyallan	497
				Arcadian												Mindyallan	498.4
																Boomerangian	499
		Drumian														Undillan	500.5
		Drumian														Floran	503
		Wuliuan												Topazan		Templetonian	504.5
														Delamaran		Templetonian	506.5
																Ordian	507.8 *
	Series 2	Stage 4	Early Cambrian	Branchian											Waucoban †	Ordian	509
																	510.8 *
														Dyeran			511 *
		Stage 3												Dyeran			514
														Montezuman			514.8 *
				Placentian										Montezuman			517.1
														Begadean			519.9 *
	Terreneuvian	Stage 2															521
	Terreneuvian	Fortunian															529
																	538.8