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
  • 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
  • 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
  • D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. view
  • Z.-X. Qiu and Z.-D. Qiu. 1995. Chronological sequence and subdivision of Chinese Neogene mammalian faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 116(1-2):41-70 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 126699 collections

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International Chronostratigraphic TimescaleCambrian of ChinaCambrian of SiberiaOrdovician of the BalticCambrian of KazakhstanCambrian of North America
462.9
482.2
CambrianFurongianStage 10NiucheheanTaoyuanian †BatyrbaianTavgian †Ketyan †/YurakianOelandPakerortBatyrbaianFranconian †/Dresbachian/Millardan485.4 *
486.3 *
486.5
Sunwaptan487.5
JiangshanianJiangshanian489.5
AksaianAksaian490.7 *
SakianSakian492.2 *
Steptoean493 *
PaibianPaibian494
Ensyan †/Maduan/Nganasanian494.7 *
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianGuzhangianWangcunian †AyusokkanianAyusokkanianMarjumianAlbertian †497
Mayan/Menevian499.5
DrumianDrumianZhanaarykian500.5
Tuesaian503
WuliuanWuliuan/TaijangianAmgan/SolvanTopazan504.5
505.3
Delamaran506.5
Series 2Stage 4DuyunianWaucoban †509
ToyonianLenian †Toyonian510 *
Dyeran511 *
BotomianBotomian512.5 *
Stage 3Nangaoian514
Montezuman514.8 *
AtdabanianAtdabanian515.6 *
Begadean519.9 *
TerreneuvianStage 2MeishucunianTommotianTommotian521
Nemakit-Daldynian525.5
FortunianManykaian †529
Jinnigian530.7
538.8