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

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian Epochs	Ordovician of Britain				Cambrian of North America		Cambrian of Kazakhstan
Ordovician	Late Ordovician	Hirnantian		Ashgill	Hirnantian						443.8
		Katian			Rawtheyan						445.2
					Cautleyan						448.9 *
					Pusgillian						449.3 *
				Caradoc	Streffordian	Onnian †					449.6 *
					Cheneyan						451.5 *
					Burrellian						452.7 *
		Sandbian									453
						Actonian †					453.2 *
						Marshbrookian †	Woolstonian †				454.2 *
						Longvillian †					455.2 *
					Aurelucian	Longvillian †					456.8 *
					Aurelucian	Soudleyan †/Harnagian/Costonian					457.4 *
	Middle Ordovician	Darriwilian		Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn						458.4
		Darriwilian			Abereiddian/Early Llanvirn						461.3 *
		Dapingian			Abereiddian/Early Llanvirn						467.3
		Dapingian		Arenig	Fennian						468.4 *
	Early Ordovician	Floian			Fennian						470
					Whitlandian						471.1 *
					Moridunian						474.3 *
		Tremadocian		Tremadoc	Migneintian					Ungurian	477.7
				Tremadoc	Cressagian						480.8 *
											485 *
Cambrian	Furongian	Stage 10	Late Cambrian						Franconian †/Dresbachian/Millardan	Batyrbaian	485.4
		Stage 10						Sunwaptan			487.5
		Jiangshanian									489.5
										Aksaian	490.7 *
										Sakian	492.2 *
								Steptoean			493 *
		Paibian						Steptoean			494
	Miaolingian	Guzhangian	Middle Cambrian					Marjumian	Albertian †	Ayusokkanian	497
		Guzhangian									499.5
		Drumian								Zhanaarykian	500.5
		Drumian								Tuesaian	503
		Wuliuan						Topazan		Tuesaian	504.5
								Topazan			505.3
								Delamaran			506.5
	Series 2	Stage 4	Early Cambrian						Waucoban †		509
										Toyonian	510 *
								Dyeran		Toyonian	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