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
  • P. L. Gibbard, M. J. Head, and M. J. C. Walker. 2010. Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma. Journal of Quaternary Science 25(2):96-102 view
  • F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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.

This timescale is used in the definition of 126568 collections

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International Chronostratigraphic TimescaleDevonian of FranceDevonian of GermanyDevonian Subages
DevonianLate DevonianFamennianFamennianWocklum/Dasberg/Hemberg/NehdenLate Famennian358.9
Middle Famennian365.3 *
Early Famennian368.5 *
FrasnianFrasnianAdorfLate Frasnian372.2
Middle Frasnian375.4 *
Early Frasnian379.3 *
Middle DevonianGivetianGivetianGivetianLate Givetian382.7
Middle Givetian383.7 *
Early Givetian385.9 *
EifelianCouvinienEifelianLate Eifelian387.7
Early Eifelian390.3 *
Early DevonianEmsianEmsianLate Emsian393.3
Early Emsian398.3 *
PragianSiegenPragian407.6
Coblencien408.2 *
LochkovianGedinnineGedinnineLate Lochkovian410.8
Middle Lochkovian412.8 *
Early Lochkovian415.6 *
419.2