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 126764 collections

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International Chronostratigraphic Timescale			Cambrian of West Avalonia	Cambrian of China		Cambrian of North America
Cambrian	Furongian	Stage 10		Niuchehean	Taoyuanian †		Franconian †/Dresbachian/Millardan	485.4
		Stage 10		Niuchehean		Sunwaptan		487.5
		Jiangshanian		Jiangshanian		Sunwaptan		489.5
		Jiangshanian		Jiangshanian		Steptoean		493 *
		Paibian		Paibian				494
		Paibian		Paibian	Waergangian †/Youshuanian			494.9 *
	Miaolingian	Guzhangian		Guzhangian	Wangcunian †	Marjumian	Albertian †	497
		Guzhangian	Arcadian	Guzhangian				498.4
		Drumian		Drumian				500.5
		Wuliuan		Wuliuan/Taijangian		Topazan		504.5
		Wuliuan		Wuliuan/Taijangian		Delamaran		506.5
	Series 2	Stage 4	Branchian	Duyunian		Delamaran	Waucoban †	509
		Stage 4		Duyunian		Dyeran		511 *
		Stage 3		Nangaoian		Dyeran		514
						Montezuman		514.8 *
			Placentian			Montezuman		517.1
						Begadean		519.9 *
	Terreneuvian	Stage 2		Meishucunian				521
		Fortunian		Meishucunian				529
		Fortunian		Jinnigian				530.7
								538.8