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
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
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 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

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian of Kazakhstan	Cambrian of North America
Cambrian	Furongian	Stage 10	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	Ayusokkanian	Marjumian	Albertian †	497
		Guzhangian				499.5
		Drumian	Zhanaarykian			500.5
		Drumian	Tuesaian			503
		Wuliuan	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				514
				Montezuman		514.8 *
			Atdabanian	Montezuman		515.6 *
			Atdabanian	Begadean		519.9 *
	Terreneuvian	Stage 2	Tommotian			521
		Stage 2				525.5
		Fortunian				529
						538.8