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
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

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 127252 collections

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