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
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
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

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 North America					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							Pakerort			485.4
													486.3 *
													486.5
													487.5
		Jiangshanian											489.5
		Paibian											494
	Miaolingian	Guzhangian	Middle Cambrian										497
		Drumian											500.5
		Wuliuan											504.5
	Series 2	Stage 4	Early Cambrian										509
	Series 2	Stage 3											514
	Terreneuvian	Stage 2											521
	Terreneuvian	Fortunian											529
													538.8