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

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 126662 collections

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International Chronostratigraphic TimescaleDevonian SubagesDevonian of GermanyDevonian of France
DevonianLate DevonianFamennianLate FamennianWocklum/Dasberg/Hemberg/NehdenFamennian358.9
Middle Famennian365.3 *
Early Famennian368.5 *
FrasnianLate FrasnianAdorfFrasnian372.2
Middle Frasnian375.4 *
Early Frasnian379.3 *
Middle DevonianGivetianLate GivetianGivetianGivetian382.7
Middle Givetian383.7 *
Early Givetian385.9 *
EifelianLate EifelianEifelianCouvinien387.7
Early Eifelian390.3 *
Early DevonianEmsianLate EmsianEmsian393.3
Early Emsian398.3 *
PragianPragianSiegen407.6
Coblencien408.2 *
LochkovianLate LochkovianGedinnineGedinnine410.8
Middle Lochkovian412.8 *
Early Lochkovian415.6 *
419.2