PBDB Timescale

Cambrian of Britain

The interval definitions in this timescale are derived from the following sources:

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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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 602 collections

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