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
M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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

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 126699 collections

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International Chronostratigraphic Timescale			Ten Million Year Bins	Cambrian of North America
Cambrian	Furongian	Stage 10	Cambrian 5		Franconian †/Dresbachian/Millardan	485.4
		Stage 10		Sunwaptan		487.5
		Jiangshanian		Sunwaptan		489.5
		Jiangshanian		Steptoean		493 *
		Paibian		Steptoean		494
	Miaolingian	Guzhangian	Cambrian 4	Marjumian	Albertian †	497
		Drumian	Cambrian 4	Marjumian		500.5
		Wuliuan	Cambrian 3	Topazan		504.5
		Wuliuan		Delamaran		506.5
	Series 2	Stage 4		Delamaran	Waucoban †	509
		Stage 4		Dyeran		511 *
		Stage 3	Cambrian 2	Dyeran		514
				Montezuman		514.8 *
				Begadean		519.9 *
	Terreneuvian	Stage 2				521
	Terreneuvian	Fortunian	Cambrian 1			529
						538.8