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
  • 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 128360 collections

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International Chronostratigraphic TimescaleCambrian of North AmericaObsolete Precambrian AgesCambrian of ChinaPrecambrian of Russia
PhanerozoicPaleozoicCambrianFurongianStage 10Franconian †/Dresbachian/MillardanNiucheheanTaoyuanian †485.4
Sunwaptan487.5
JiangshanianJiangshanian489.5
Steptoean493 *
PaibianPaibian494
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianMarjumianAlbertian †GuzhangianWangcunian †497
DrumianDrumian500.5
WuliuanTopazanWuliuan/Taijangian504.5
Delamaran506.5
Series 2Stage 4Waucoban †Duyunian509
Dyeran511 *
Stage 3Nangaoian514
Montezuman514.8 *
Begadean519.9 *
TerreneuvianStage 2Meishucunian521
Fortunian529
Jinnigian530.7
ProterozoicNeoproterozoicEdiacaranVendian †Poundian †Vendian538.8
Wonokan †571.7 *
Cryogenian635
Tonian720
Karatau800
MesoproterozoicStenian1000
Yurmatian1100
Ectasian1200
Burzyan1375
1400