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

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 Australia
Ordovician	Late Ordovician	Hirnantian		Harju	Porkuni						443.8
		Katian			Pirgu						445.2
					Vormsi						449.6 *
					Nabala	Johvi †					450 *
				Viru	Rakvere						450.6 *
					Oandu						452 *
		Sandbian			Keila	Idavere †					453
					Haljala						453.9
					Kukruse						456.4 *
					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			Volkhov						467.3
		Dapingian			Billingen						469.3 *
	Early Ordovician	Floian									470
						Latorp †					470.1 *
					Hunneberg						473.7 *
		Tremadocian			Hunneberg						477.7
					Varangu						481.3 *
					Pakerort						482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian		Pakerort				Franconian †/Dresbachian/Millardan	Datsonian	485.4
											486.3 *
											486.5
										Payntonian	486.8 *
								Sunwaptan		Payntonian	487.5
		Jiangshanian						Sunwaptan		Iverian	489.5
		Jiangshanian						Steptoean		Iverian	493 *
		Paibian						Steptoean		Idamean	494
	Miaolingian	Guzhangian	Middle Cambrian					Marjumian	Albertian †	Mindyallan	497
		Guzhangian								Boomerangian	499
		Drumian								Undillan	500.5
		Drumian								Floran	503
		Wuliuan						Topazan		Templetonian	504.5
								Delamaran		Templetonian	506.5
										Ordian	507.8 *
	Series 2	Stage 4	Early Cambrian						Waucoban †	Ordian	509
											510.8 *
								Dyeran			511 *
		Stage 3						Dyeran			514
								Montezuman			514.8 *
								Begadean			519.9 *
	Terreneuvian	Stage 2									521
	Terreneuvian	Fortunian									529
											538.8