PBDB Timescale

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, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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

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 126778 collections

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International Chronostratigraphic Timescale			Cambrian Epochs	Ordovician of Ibero-Bohemia
Ordovician	Late Ordovician	Hirnantian		Kosovian				443.8
		Katian		Kralodvorian	Bohdalec †			445.2
		Katian		Berounian				449.7 *
		Sandbian						453
						Zahorany †/Vinice	Letna †	456.2 *
					Liben †			458 *
	Middle Ordovician	Darriwilian						458.4
				Dobrotivian				458.5 *
				Oretanian				459.7 *
					Sarka †			461.7 *
		Dapingian			Klabava †			467.3
		Dapingian		Arenigian				468
	Early Ordovician	Floian		Arenigian				470
	Early Ordovician	Tremadocian		Tremadocian				477.7
Cambrian	Furongian	Stage 10	Late Cambrian					485.4
		Jiangshanian						489.5
		Paibian						494
	Miaolingian	Guzhangian	Middle Cambrian					497
		Drumian						500.5
		Wuliuan						504.5
	Series 2	Stage 4	Early Cambrian					509
	Series 2	Stage 3						514
	Terreneuvian	Stage 2						521
	Terreneuvian	Fortunian						529
								538.8