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		Cambrian of China		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	Niuchehean	Taoyuanian †						485.4
																	486.3 *
																	486.5
																	487.5
									Festiniogian								489.2 *
		Jiangshanian							Festiniogian	Jiangshanian							489.5
		Jiangshanian							Maentwrogian	Jiangshanian							493.1 *
		Paibian								Paibian							494
		Paibian								Paibian	Waergangian †/Youshuanian						494.9 *
	Miaolingian	Guzhangian	Middle Cambrian					St Davids		Guzhangian	Wangcunian †						497
		Drumian								Drumian	Wangcunian †						500.5
		Wuliuan								Wuliuan/Taijangian							504.5
	Series 2	Stage 4	Early Cambrian					Caerfai		Duyunian							509
	Series 2	Stage 3								Nangaoian							514
	Terreneuvian	Stage 2								Meishucunian							521
		Fortunian								Meishucunian							529
		Fortunian								Jinnigian							530.7
																	538.8