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	Cambrian of West Avalonia	Ordovician of the Baltic				Ordovician of North America
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				477.7
										Stairsian				480.3 *
						Varangu				Stairsian				481.3 *
						Varangu				Skullrockian			Demingian †	482 *
						Pakerort							Demingian †	482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian			Pakerort								485.4
														486.3 *
														486.5
														487.5
		Jiangshanian												489.5
		Paibian												494
	Miaolingian	Guzhangian	Middle Cambrian											497
		Guzhangian		Arcadian										498.4
		Drumian												500.5
		Wuliuan												504.5
	Series 2	Stage 4	Early Cambrian	Branchian										509
		Stage 3		Branchian										514
		Stage 3		Placentian										517.1
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
														538.8