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 Kazakhstan	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								Ungurian		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	Batyrbaian						485.4
																486.3 *
																486.5
								Sunwaptan								487.5
		Jiangshanian														489.5
										Aksaian						490.7 *
										Sakian						492.2 *
								Steptoean								493 *
		Paibian						Steptoean								494
	Miaolingian	Guzhangian	Middle Cambrian					Marjumian	Albertian †	Ayusokkanian						497
		Guzhangian														499.5
		Drumian								Zhanaarykian						500.5
		Drumian								Tuesaian						503
		Wuliuan						Topazan		Tuesaian						504.5
								Topazan								505.3
								Delamaran								506.5
	Series 2	Stage 4	Early Cambrian						Waucoban †							509
										Toyonian						510 *
								Dyeran		Toyonian						511 *
										Botomian						512.5 *
		Stage 3														514
								Montezuman								514.8 *
								Montezuman		Atdabanian						515.6 *
								Begadean		Atdabanian						519.9 *
	Terreneuvian	Stage 2								Tommotian						521
		Stage 2														525.5
		Fortunian														529
																538.8