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 125945 collections

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International Chronostratigraphic Timescale			Ten Million Year Bins	Cambrian of Kazakhstan	Cambrian of North America
Cambrian	Furongian	Stage 10	Cambrian 5	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	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				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