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 Britain				Ordovician of the Baltic				Cambrian of Australia	Cambrian of Britain		Cambrian of West Avalonia
Ordovician	Late Ordovician	Hirnantian		Ashgill	Hirnantian			Harju	Porkuni							443.8
		Katian			Rawtheyan				Pirgu							445.2
					Cautleyan											448.9 *
					Pusgillian											449.3 *
				Caradoc	Streffordian	Onnian †			Vormsi							449.6 *
									Nabala	Johvi †						450 *
								Viru	Rakvere							450.6 *
					Cheneyan				Rakvere							451.5 *
					Cheneyan				Oandu							452 *
					Burrellian				Oandu							452.7 *
		Sandbian							Keila	Idavere †						453
						Actonian †			Keila							453.2 *
						Actonian †			Haljala							453.9
						Marshbrookian †	Woolstonian †									454.2 *
						Longvillian †										455.2 *
									Kukruse							456.4 *
					Aurelucian											456.8 *
						Soudleyan †/Harnagian/Costonian										457.4 *
						Soudleyan †/Harnagian/Costonian			Uhaku	Aluoja †						457.5 *
	Middle Ordovician	Darriwilian		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Uhaku							458.4
									Lasnamagi							458.9 *
									Aseri							460.4 *
					Abereiddian/Early Llanvirn				Aseri							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 *
					Whitlandian				Hunneberg							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									Datsonian	Merioneth	Dolgellian/Trempealeauan		485.4
																486.3 *
																486.5
												Payntonian				486.8 *
												Payntonian		Festiniogian		489.2 *
		Jiangshanian										Iverian		Festiniogian		489.5
		Jiangshanian										Iverian		Maentwrogian		493.1 *
		Paibian										Idamean		Maentwrogian		494
	Miaolingian	Guzhangian	Middle Cambrian									Mindyallan	St Davids			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									Ordian	Caerfai		Branchian	509
		Stage 4														510.8 *
		Stage 3														514
		Stage 3													Placentian	517.1
	Terreneuvian	Stage 2														521
	Terreneuvian	Fortunian														529
																538.8