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	Ordovician of Britain
Ordovician	Late Ordovician	Hirnantian		Harju	Porkuni				Ashgill	Hirnantian			443.8
		Katian			Pirgu					Rawtheyan			445.2
										Cautleyan			448.9 *
										Pusgillian			449.3 *
					Vormsi				Caradoc	Streffordian	Onnian †		449.6 *
					Nabala	Johvi †							450 *
				Viru	Rakvere								450.6 *
					Rakvere					Cheneyan			451.5 *
					Oandu					Cheneyan			452 *
					Oandu					Burrellian			452.7 *
		Sandbian			Keila	Idavere †							453
					Keila						Actonian †		453.2 *
					Haljala						Actonian †		453.9
											Marshbrookian †	Woolstonian †	454.2 *
											Longvillian †		455.2 *
					Kukruse								456.4 *
										Aurelucian			456.8 *
											Soudleyan †/Harnagian/Costonian		457.4 *
					Uhaku	Aluoja †					Soudleyan †/Harnagian/Costonian		457.5 *
	Middle Ordovician	Darriwilian			Uhaku				Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn			458.4
					Lasnamagi								458.9 *
					Aseri								460.4 *
					Aseri					Abereiddian/Early Llanvirn			461.3 *
				Oeland	Kunda								462.9 *
					Kunda	Valaste †/Hunderum							464.3 *
					Volkhov		Langevoja †/Vaana/Saka						467.1 *
		Dapingian											467.3
									Arenig	Fennian			468.4 *
					Billingen								469.3 *
	Early Ordovician	Floian											470
						Latorp †							470.1 *
										Whitlandian			471.1 *
					Hunneberg					Whitlandian			473.7 *
										Moridunian			474.3 *
		Tremadocian							Tremadoc	Migneintian			477.7
										Cressagian			480.8 *
					Varangu								481.3 *
					Pakerort								482.2 *
													485 *
Cambrian	Furongian	Stage 10	Late Cambrian										485.4
													486.3 *
													486.5
		Jiangshanian											489.5
		Paibian											494
	Miaolingian	Guzhangian	Middle Cambrian										497
		Guzhangian						Arcadian					498.4
		Drumian											500.5
		Wuliuan											504.5
	Series 2	Stage 4	Early Cambrian					Branchian					509
		Stage 3						Branchian					514
		Stage 3						Placentian					517.1
	Terreneuvian	Stage 2											521
	Terreneuvian	Fortunian											529
													538.8