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
  • 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
  • F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126679 collections

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International Chronostratigraphic TimescaleOrdovician of North AmericaCambrian of SiberiaCambrian of KazakhstanCambrian of West AvaloniaCambrian of Australia
470
482
CambrianFurongianStage 10IbexianSkullrockianBatyrbaianTavgian †Ketyan †/YurakianBatyrbaianDatsonian485.4 *
Payntonian486.8 *
487.5
JiangshanianIverian489.5
AksaianAksaian490.7 *
SakianSakian492.2 *
PaibianIdamean494
Ensyan †/Maduan/Nganasanian494.7 *
MiaolingianGuzhangianAyusokkanianAyusokkanianMindyallan497
Arcadian498.4
Boomerangian499
Mayan/Menevian499.5
DrumianZhanaarykianUndillan500.5
TuesaianFloran503
WuliuanAmgan/SolvanTempletonian504.5
505.3
Ordian507.8 *
Series 2Stage 4Branchian509
ToyonianLenian †Toyonian510 *
510.8 *
BotomianBotomian512.5 *
Stage 3514
AtdabanianAtdabanian515.6 *
Placentian517.1
TerreneuvianStage 2TommotianTommotian521
Nemakit-Daldynian525.5
FortunianManykaian †529
538.8