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 126701 collections

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International Chronostratigraphic Timescale			Ten Million Year Bins	Obsolete Names for ICS Units		Cambrian of Australia	Cambrian of North America
Cambrian	Furongian	Stage 10	Cambrian 5			Datsonian		Franconian †/Dresbachian/Millardan	485.4
						Payntonian			486.8 *
						Payntonian	Sunwaptan		487.5
		Jiangshanian				Iverian	Sunwaptan		489.5
		Jiangshanian				Iverian	Steptoean		493 *
		Paibian				Idamean	Steptoean		494
	Miaolingian	Guzhangian	Cambrian 4	Series 3 †		Mindyallan	Marjumian	Albertian †	497
		Guzhangian				Boomerangian			499
		Drumian				Undillan			500.5
		Drumian				Floran			503
		Wuliuan	Cambrian 3		Stage 5 †	Templetonian	Topazan		504.5
						Templetonian	Delamaran		506.5
						Ordian			507.8 *
	Series 2	Stage 4				Ordian		Waucoban †	509
									510.8 *
							Dyeran		511 *
		Stage 3	Cambrian 2				Dyeran		514
							Montezuman		514.8 *
							Begadean		519.9 *
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian	Cambrian 1						529
									538.8