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
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 126884 collections

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International Chronostratigraphic Timescale			Silurian of England		Silurian Ages of Europe	Silurian of the Baltic
Silurian	Pridoli		Red Downtonian/Temeside Shales/Downton Castle	Whitcliffe/Leintwardine		Ohesaare	419.2
				Bringewood/Elton		Ohesaare	421.3
				Bringewood/Elton		Kaugetuma	421.7 *
	Ludlow	Ludfordian	Coalbrookdale	Wenlock (England)/Tickwood		Kuressaare	423
		Ludfordian		Wenlock (England)/Tickwood		Paadla	423.4 *
		Gorstian					425.6
		Gorstian		Buildwas			426.4 *
	Wenlock	Homerian		Buildwas	Gleedonian	Rootsikula	427.4
			Wych	Woolhope		Rootsikula	428.4 *
						Jaagarahu	429.2 *
					Whitwellian		429.7 *
		Sheinwoodian					430.5
		Sheinwoodian				Jaani	431.8 *
	Llandovery	Telychian				Jaani	433.4
						Adavere	434 *
							436.3 *
		Aeronian					438.5
			Cowleigh Park				439.3 *
						Raikkula	439.4 *
		Rhuddanian				Raikkula	440.8
		Rhuddanian				Juuru	441.4 *
							443.8