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
  • D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 126610 collections

Show more time

Show linear time

International Chronostratigraphic TimescaleCambrian of SiberiaCambrian of AustraliaCambrian of West Avalonia
CambrianFurongianStage 10BatyrbaianTavgian †Ketyan †/YurakianDatsonian485.4
Payntonian486.8 *
JiangshanianIverian489.5
Aksaian490.7 *
Sakian492.2 *
PaibianIdamean494
Ensyan †/Maduan/Nganasanian494.7 *
MiaolingianGuzhangianAyusokkanianMindyallan497
Arcadian498.4
Boomerangian499
Mayan/Menevian499.5
DrumianUndillan500.5
Floran503
WuliuanAmgan/SolvanTempletonian504.5
Ordian507.8 *
Series 2Stage 4Branchian509
ToyonianLenian †510 *
510.8 *
Botomian512.5 *
Stage 3514
Atdabanian515.6 *
Placentian517.1
TerreneuvianStage 2Tommotian521
Nemakit-Daldynian525.5
FortunianManykaian †529
538.8