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
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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				Cambrian of China		Ordovician of North America					Cambrian 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			Niuchehean	Taoyuanian †							Franconian †/Dresbachian/Millardan	485.4
																		486.3 *
																		486.5
																Sunwaptan		487.5
				Festiniogian														489.2 *
		Jiangshanian							Jiangshanian									489.5
																Steptoean		493 *
				Maentwrogian														493.1 *
		Paibian							Paibian									494
		Paibian							Paibian	Waergangian †/Youshuanian								494.9 *
	Miaolingian	Guzhangian	St Davids						Guzhangian	Wangcunian †						Marjumian	Albertian †	497
		Drumian							Drumian	Wangcunian †						Marjumian		500.5
		Wuliuan							Wuliuan/Taijangian							Topazan		504.5
		Wuliuan							Wuliuan/Taijangian							Delamaran		506.5
	Series 2	Stage 4	Caerfai						Duyunian							Delamaran	Waucoban †	509
		Stage 4							Duyunian							Dyeran		511 *
		Stage 3							Nangaoian							Dyeran		514
																Montezuman		514.8 *
																Begadean		519.9 *
	Terreneuvian	Stage 2							Meishucunian									521
		Fortunian							Meishucunian									529
		Fortunian							Jinnigian									530.7
																		538.8