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, 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 125929 collections

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