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
  • F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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
  • B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 127017 collections

Show more time

Show linear time

International Chronostratigraphic TimescaleTen Million Year BinsCambrian of AustraliaCambrian of ChinaCambrian of KazakhstanCambrian of North America
CambrianFurongianStage 10Cambrian 5DatsonianNiucheheanTaoyuanian †BatyrbaianFranconian †/Dresbachian/Millardan485.4
Payntonian486.8 *
Sunwaptan487.5
JiangshanianIverianJiangshanian489.5
Aksaian490.7 *
Sakian492.2 *
Steptoean493 *
PaibianIdameanPaibian494
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianCambrian 4MindyallanGuzhangianWangcunian †AyusokkanianMarjumianAlbertian †497
Boomerangian499
499.5
DrumianUndillanDrumianZhanaarykian500.5
FloranTuesaian503
WuliuanCambrian 3TempletonianWuliuan/TaijangianTopazan504.5
505.3
Delamaran506.5
Ordian507.8 *
Series 2Stage 4DuyunianWaucoban †509
Toyonian510 *
510.8 *
Dyeran511 *
Botomian512.5 *
Stage 3Cambrian 2Nangaoian514
Montezuman514.8 *
Atdabanian515.6 *
Begadean519.9 *
TerreneuvianStage 2MeishucunianTommotian521
525.5
FortunianCambrian 1529
Jinnigian530.7
538.8