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 West Avalonia	Cambrian of Kazakhstan	Cambrian of Britain
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				Ungurian			477.7
					Varangu							481.3 *
					Pakerort							482.2 *
Cambrian	Furongian	Stage 10	Late Cambrian		Pakerort				Batyrbaian	Merioneth	Dolgellian/Trempealeauan	485.4
												486.3 *
												486.5
											Festiniogian	489.2 *
		Jiangshanian										489.5
									Aksaian			490.7 *
									Sakian			492.2 *
											Maentwrogian	493.1 *
		Paibian									Maentwrogian	494
	Miaolingian	Guzhangian	Middle Cambrian						Ayusokkanian	St Davids		497
								Arcadian	Ayusokkanian			498.4
												499.5
		Drumian							Zhanaarykian			500.5
		Drumian							Tuesaian			503
		Wuliuan							Tuesaian			504.5
		Wuliuan										505.3
	Series 2	Stage 4	Early Cambrian					Branchian		Caerfai		509
									Toyonian			510 *
									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