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 126762 collections

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International Chronostratigraphic Timescale			Cambrian of Australia	Cambrian Epochs	Cambrian of Britain		Cambrian of North America
Cambrian	Furongian	Stage 10	Datsonian	Late Cambrian	Merioneth	Dolgellian/Trempealeauan		Franconian †/Dresbachian/Millardan	485.4
			Payntonian						486.8 *
							Sunwaptan		487.5
						Festiniogian			489.2 *
		Jiangshanian	Iverian						489.5
							Steptoean		493 *
						Maentwrogian			493.1 *
		Paibian	Idamean			Maentwrogian			494
	Miaolingian	Guzhangian	Mindyallan	Middle Cambrian	St Davids		Marjumian	Albertian †	497
		Guzhangian	Boomerangian						499
		Drumian	Undillan						500.5
		Drumian	Floran						503
		Wuliuan	Templetonian				Topazan		504.5
			Templetonian				Delamaran		506.5
			Ordian						507.8 *
	Series 2	Stage 4	Ordian	Early Cambrian	Caerfai			Waucoban †	509
									510.8 *
							Dyeran		511 *
		Stage 3					Dyeran		514
							Montezuman		514.8 *
							Begadean		519.9 *
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian							529
									538.8