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
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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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	Cambrian of North America		Cambrian of Britain		Ordovician of North America					Cambrian of West Avalonia	Ordovician of the Baltic
Ordovician	Late Ordovician	Hirnantian						Cincinnatian	Gamachian					Harju	Porkuni			443.8
		Katian							Gamachian						Pirgu			445.2
									Richmondian						Pirgu			446 *
									Richmondian						Vormsi			449.6 *
									Maysvillian	Rocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian					Vormsi			449.8 *
									Maysvillian						Nabala	Johvi †		450 *
									Edenian						Nabala			450.4 *
									Edenian					Viru	Rakvere			450.6 *
								Mohawkian	Chatfieldian						Rakvere			451.1 *
															Oandu			452 *
		Sandbian													Keila	Idavere †		453
									Turinian						Keila			453.7 *
															Haljala			453.9
															Kukruse			456.4 *
								Whiterockian		Canadian †	Chazyan †/Marmor				Kukruse			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 *
									Rangerian						Billingen			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 *
									Stairsian						Varangu			481.3 *
									Skullrockian			Demingian †			Varangu			482 *
												Demingian †			Pakerort			482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian		Franconian †/Dresbachian/Millardan	Merioneth	Dolgellian/Trempealeauan								Pakerort			485.4
																		486.3 *
																		486.5
				Sunwaptan														487.5
							Festiniogian											489.2 *
		Jiangshanian																489.5
				Steptoean														493 *
							Maentwrogian											493.1 *
		Paibian					Maentwrogian											494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †	St Davids												497
		Guzhangian											Arcadian					498.4
		Drumian																500.5
		Wuliuan		Topazan														504.5
		Wuliuan		Delamaran														506.5
	Series 2	Stage 4	Early Cambrian	Delamaran	Waucoban †	Caerfai							Branchian					509
		Stage 4		Dyeran														511 *
		Stage 3		Dyeran														514
				Montezuman														514.8 *
				Montezuman									Placentian					517.1
				Begadean														519.9 *
	Terreneuvian	Stage 2																521
	Terreneuvian	Fortunian																529
																		538.8