PBDB Interval

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. 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
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 59 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 127258 collections

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International Chronostratigraphic Timescale			Cambrian of North America		Ten Million Year Bins	Cambrian of West Avalonia	Cambrian of Kazakhstan
Cambrian	Furongian	Stage 10		Franconian †/Dresbachian/Millardan	Cambrian 5		Batyrbaian	485.4
		Stage 10	Sunwaptan					487.5
		Jiangshanian						489.5
							Aksaian	490.7 *
							Sakian	492.2 *
			Steptoean					493 *
		Paibian	Steptoean					494
	Miaolingian	Guzhangian	Marjumian	Albertian †	Cambrian 4		Ayusokkanian	497
						Arcadian	Ayusokkanian	498.4
								499.5
		Drumian					Zhanaarykian	500.5
		Drumian					Tuesaian	503
		Wuliuan	Topazan		Cambrian 3		Tuesaian	504.5
			Topazan					505.3
			Delamaran					506.5
	Series 2	Stage 4		Waucoban †		Branchian		509
							Toyonian	510 *
			Dyeran				Toyonian	511 *
							Botomian	512.5 *
		Stage 3			Cambrian 2			514
			Montezuman					514.8 *
							Atdabanian	515.6 *
						Placentian		517.1
			Begadean					519.9 *
	Terreneuvian	Stage 2					Tommotian	521
		Stage 2						525.5
		Fortunian			Cambrian 1			529
								538.8