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 Britain		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			Merioneth	Dolgellian/Trempealeauan						485.4
															486.3 *
															486.5
															487.5
									Festiniogian						489.2 *
		Jiangshanian							Festiniogian						489.5
		Jiangshanian							Maentwrogian						493.1 *
		Paibian							Maentwrogian						494
	Miaolingian	Guzhangian	Middle Cambrian					St Davids							497
		Drumian													500.5
		Wuliuan													504.5
	Series 2	Stage 4	Early Cambrian					Caerfai							509
	Series 2	Stage 3													514
	Terreneuvian	Stage 2													521
	Terreneuvian	Fortunian													529
															538.8