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 North America		Cambrian of Britain		Ordovician of North America					Cambrian of West Avalonia
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				Franconian †/Dresbachian/Millardan	Merioneth	Dolgellian/Trempealeauan							485.4
																		486.3 *
																		486.5
								Sunwaptan										487.5
											Festiniogian							489.2 *
		Jiangshanian																489.5
								Steptoean										493 *
											Maentwrogian							493.1 *
		Paibian									Maentwrogian							494
	Miaolingian	Guzhangian	Middle Cambrian					Marjumian	Albertian †	St Davids								497
		Guzhangian															Arcadian	498.4
		Drumian																500.5
		Wuliuan						Topazan										504.5
		Wuliuan						Delamaran										506.5
	Series 2	Stage 4	Early Cambrian					Delamaran	Waucoban †	Caerfai							Branchian	509
		Stage 4						Dyeran										511 *
		Stage 3						Dyeran										514
								Montezuman										514.8 *
								Montezuman									Placentian	517.1
								Begadean										519.9 *
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																		538.8