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 Australia	Cambrian of West Avalonia	Ordovician of North America					Cambrian of Kazakhstan
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				Ungurian	477.7
											Stairsian					480.3 *
					Varangu						Stairsian					481.3 *
					Varangu						Skullrockian			Demingian †		482 *
					Pakerort									Demingian †		482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian		Pakerort			Datsonian							Batyrbaian	485.4
																486.3 *
																486.5
								Payntonian								486.8 *
								Payntonian								487.5
		Jiangshanian						Iverian								489.5
															Aksaian	490.7 *
															Sakian	492.2 *
		Paibian						Idamean							Sakian	494
	Miaolingian	Guzhangian	Middle Cambrian					Mindyallan							Ayusokkanian	497
								Mindyallan	Arcadian							498.4
								Boomerangian								499
								Boomerangian								499.5
		Drumian						Undillan							Zhanaarykian	500.5
		Drumian						Floran							Tuesaian	503
		Wuliuan						Templetonian							Tuesaian	504.5
								Templetonian								505.3
								Ordian								507.8 *
	Series 2	Stage 4	Early Cambrian						Branchian							509
															Toyonian	510 *
															Toyonian	510.8 *
															Botomian	512.5 *
		Stage 3													Botomian	514
															Atdabanian	515.6 *
									Placentian						Atdabanian	517.1
	Terreneuvian	Stage 2													Tommotian	521
		Stage 2														525.5
		Fortunian														529
																538.8