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
M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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
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 126668 collections

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International Chronostratigraphic Timescale			Obsolete Names for ICS Units		Ordovician of the Baltic		Cambrian Epochs	Cambrian of Australia
									462.9
									482.2
Cambrian	Furongian	Stage 10			Oeland	Pakerort	Late Cambrian	Datsonian	485.4 *
					Oeland				486.3 *
									486.5
								Payntonian	486.8 *
		Jiangshanian						Iverian	489.5
		Paibian						Idamean	494
	Miaolingian	Guzhangian	Series 3 †				Middle Cambrian	Mindyallan	497
		Guzhangian						Boomerangian	499
		Drumian						Undillan	500.5
		Drumian						Floran	503
		Wuliuan		Stage 5 †				Templetonian	504.5
		Wuliuan		Stage 5 †				Ordian	507.8 *
	Series 2	Stage 4					Early Cambrian	Ordian	509
		Stage 4							510.8 *
		Stage 3							514
	Terreneuvian	Stage 2							521
	Terreneuvian	Fortunian							529
									538.8