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
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 126610 collections

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International Chronostratigraphic Timescale			Ordovician of the Baltic		Cambrian of Australia	Cambrian of West Avalonia
							462.9
							482.2
Cambrian	Furongian	Stage 10	Oeland	Pakerort	Datsonian		485.4 *
			Oeland				486.3 *
							486.5
					Payntonian		486.8 *
		Jiangshanian			Iverian		489.5
		Paibian			Idamean		494
	Miaolingian	Guzhangian			Mindyallan		497
					Mindyallan	Arcadian	498.4
					Boomerangian		499
		Drumian			Undillan		500.5
		Drumian			Floran		503
		Wuliuan			Templetonian		504.5
		Wuliuan			Ordian		507.8 *
	Series 2	Stage 4			Ordian	Branchian	509
		Stage 4					510.8 *
		Stage 3					514
		Stage 3				Placentian	517.1
	Terreneuvian	Stage 2					521
	Terreneuvian	Fortunian					529
							538.8