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
  • J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) 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

Show more time

Show linear time

International Chronostratigraphic TimescaleTen Million Year BinsCambrian of ChinaCambrian of North America
CambrianFurongianStage 10Cambrian 5NiucheheanTaoyuanian †Franconian †/Dresbachian/Millardan485.4
Sunwaptan487.5
JiangshanianJiangshanian489.5
Steptoean493 *
PaibianPaibian494
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianCambrian 4GuzhangianWangcunian †MarjumianAlbertian †497
DrumianDrumian500.5
WuliuanCambrian 3Wuliuan/TaijangianTopazan504.5
Delamaran506.5
Series 2Stage 4DuyunianWaucoban †509
Dyeran511 *
Stage 3Cambrian 2Nangaoian514
Montezuman514.8 *
Begadean519.9 *
TerreneuvianStage 2Meishucunian521
FortunianCambrian 1529
Jinnigian530.7
538.8