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
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

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 Kazakhstan	Cambrian of West Avalonia	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
			Ayusokkanian	Arcadian			498.4
							499.5
		Drumian	Zhanaarykian				500.5
		Drumian	Tuesaian				503
		Wuliuan	Tuesaian		Topazan		504.5
					Topazan		505.3
					Delamaran		506.5
	Series 2	Stage 4		Branchian		Waucoban †	509
			Toyonian				510 *
			Toyonian		Dyeran		511 *
			Botomian				512.5 *
		Stage 3					514
					Montezuman		514.8 *
			Atdabanian				515.6 *
				Placentian			517.1
					Begadean		519.9 *
	Terreneuvian	Stage 2	Tommotian				521
		Stage 2					525.5
		Fortunian					529
							538.8