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
  • M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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
  • J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
  • D. H. Erwin and S. A. Bowring. 2004. Cambrian time scale. 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 TimescaleCambrian of AustraliaCambrian of North AmericaOrdovician of North AmericaCambrian of KazakhstanCambrian of Siberia
470
482
CambrianFurongianStage 10DatsonianFranconian †/Dresbachian/MillardanIbexianSkullrockianBatyrbaianBatyrbaianTavgian †Ketyan †/Yurakian485.4 *
Payntonian486.8 *
Sunwaptan487.5
JiangshanianIverian489.5
AksaianAksaian490.7 *
SakianSakian492.2 *
Steptoean493 *
PaibianIdamean494
Ensyan †/Maduan/Nganasanian494.7 *
MiaolingianGuzhangianMindyallanMarjumianAlbertian †AyusokkanianAyusokkanian497
Boomerangian499
Mayan/Menevian499.5
DrumianUndillanZhanaarykian500.5
FloranTuesaian503
WuliuanTempletonianTopazanAmgan/Solvan504.5
505.3
Delamaran506.5
Ordian507.8 *
Series 2Stage 4Waucoban †509
ToyonianToyonianLenian †510 *
510.8 *
Dyeran511 *
BotomianBotomian512.5 *
Stage 3514
Montezuman514.8 *
AtdabanianAtdabanian515.6 *
Begadean519.9 *
TerreneuvianStage 2TommotianTommotian521
Nemakit-Daldynian525.5
FortunianManykaian †529
538.8