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	Cambrian of North America		Cambrian of Australia	Ordovician of the Baltic				Cambrian of Kazakhstan
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		Franconian †/Dresbachian/Millardan	Datsonian		Pakerort			Batyrbaian	485.4
												486.3 *
												486.5
						Payntonian						486.8 *
				Sunwaptan		Payntonian						487.5
		Jiangshanian				Iverian						489.5
											Aksaian	490.7 *
											Sakian	492.2 *
				Steptoean								493 *
		Paibian		Steptoean		Idamean						494
	Miaolingian	Guzhangian	Middle Cambrian	Marjumian	Albertian †	Mindyallan					Ayusokkanian	497
						Boomerangian					Ayusokkanian	499
						Boomerangian						499.5
		Drumian				Undillan					Zhanaarykian	500.5
		Drumian				Floran					Tuesaian	503
		Wuliuan		Topazan		Templetonian					Tuesaian	504.5
				Topazan								505.3
				Delamaran								506.5
						Ordian						507.8 *
	Series 2	Stage 4	Early Cambrian		Waucoban †							509
											Toyonian	510 *
												510.8 *
				Dyeran								511 *
											Botomian	512.5 *
		Stage 3										514
				Montezuman								514.8 *
				Montezuman							Atdabanian	515.6 *
				Begadean							Atdabanian	519.9 *
	Terreneuvian	Stage 2									Tommotian	521
		Stage 2										525.5
		Fortunian										529
												538.8