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
  • 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
  • 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
  • M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
  • J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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 126844 collections

Show more time

Show linear time

International Chronostratigraphic TimescaleCambrian of AustraliaCambrian of ChinaOrdovician of North AmericaCambrian of KazakhstanCambrian of Siberia
470
482
CambrianFurongianStage 10DatsonianNiucheheanTaoyuanian †IbexianSkullrockianBatyrbaianBatyrbaianTavgian †Ketyan †/Yurakian485.4 *
Payntonian486.8 *
487.5
JiangshanianIverianJiangshanian489.5
AksaianAksaian490.7 *
SakianSakian492.2 *
PaibianIdameanPaibian494
Ensyan †/Maduan/Nganasanian494.7 *
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianMindyallanGuzhangianWangcunian †AyusokkanianAyusokkanian497
Boomerangian499
Mayan/Menevian499.5
DrumianUndillanDrumianZhanaarykian500.5
FloranTuesaian503
WuliuanTempletonianWuliuan/TaijangianAmgan/Solvan504.5
505.3
Ordian507.8 *
Series 2Stage 4Duyunian509
ToyonianToyonianLenian †510 *
510.8 *
BotomianBotomian512.5 *
Stage 3Nangaoian514
AtdabanianAtdabanian515.6 *
TerreneuvianStage 2MeishucunianTommotianTommotian521
Nemakit-Daldynian525.5
FortunianManykaian †529
Jinnigian530.7
538.8