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
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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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 Britain		Ordovician of the Baltic				Cambrian of Australia	Cambrian of West Avalonia
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	Merioneth	Dolgellian/Trempealeauan		Pakerort			Datsonian		485.4
												486.3 *
												486.5
										Payntonian		486.8 *
					Festiniogian					Payntonian		489.2 *
		Jiangshanian			Festiniogian					Iverian		489.5
		Jiangshanian			Maentwrogian					Iverian		493.1 *
		Paibian			Maentwrogian					Idamean		494
	Miaolingian	Guzhangian	Middle Cambrian	St Davids						Mindyallan		497
										Mindyallan	Arcadian	498.4
										Boomerangian		499
		Drumian								Undillan		500.5
		Drumian								Floran		503
		Wuliuan								Templetonian		504.5
		Wuliuan								Ordian		507.8 *
	Series 2	Stage 4	Early Cambrian	Caerfai						Ordian	Branchian	509
		Stage 4										510.8 *
		Stage 3										514
		Stage 3									Placentian	517.1
	Terreneuvian	Stage 2										521
	Terreneuvian	Fortunian										529
												538.8