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, 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
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 127258 collections

Show more time

Show linear time

International Chronostratigraphic Timescale			Cambrian of China		Cambrian of Britain		Cambrian of North America
Cambrian	Furongian	Stage 10	Niuchehean	Taoyuanian †	Merioneth	Dolgellian/Trempealeauan		Franconian †/Dresbachian/Millardan	485.4
						Dolgellian/Trempealeauan	Sunwaptan		487.5
						Festiniogian			489.2 *
		Jiangshanian	Jiangshanian						489.5
							Steptoean		493 *
						Maentwrogian			493.1 *
		Paibian	Paibian						494
		Paibian	Paibian	Waergangian †/Youshuanian					494.9 *
	Miaolingian	Guzhangian	Guzhangian	Wangcunian †	St Davids		Marjumian	Albertian †	497
		Drumian	Drumian	Wangcunian †			Marjumian		500.5
		Wuliuan	Wuliuan/Taijangian				Topazan		504.5
		Wuliuan	Wuliuan/Taijangian				Delamaran		506.5
	Series 2	Stage 4	Duyunian		Caerfai		Delamaran	Waucoban †	509
		Stage 4	Duyunian				Dyeran		511 *
		Stage 3	Nangaoian				Dyeran		514
							Montezuman		514.8 *
							Begadean		519.9 *
	Terreneuvian	Stage 2	Meishucunian						521
		Fortunian	Meishucunian						529
		Fortunian	Jinnigian						530.7
									538.8