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
  • J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 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
  • 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 126144 collections

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International Chronostratigraphic TimescaleCambrian of ChinaTen Million Year BinsCambrian of West AvaloniaCambrian of AustraliaOrdovician of North AmericaCambrian of Siberia
470
482
CambrianFurongianStage 10NiucheheanTaoyuanian †Cambrian 5DatsonianIbexianSkullrockianBatyrbaianTavgian †Ketyan †/Yurakian485.4 *
Payntonian486.8 *
487.5
JiangshanianJiangshanianIverian489.5
Aksaian490.7 *
Sakian492.2 *
PaibianPaibianIdamean494
Ensyan †/Maduan/Nganasanian494.7 *
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianGuzhangianWangcunian †Cambrian 4MindyallanAyusokkanian497
Arcadian498.4
Boomerangian499
Mayan/Menevian499.5
DrumianDrumianUndillan500.5
Floran503
WuliuanWuliuan/TaijangianCambrian 3TempletonianAmgan/Solvan504.5
Ordian507.8 *
Series 2Stage 4DuyunianBranchian509
ToyonianLenian †510 *
510.8 *
Botomian512.5 *
Stage 3NangaoianCambrian 2514
Atdabanian515.6 *
Placentian517.1
TerreneuvianStage 2MeishucunianTommotian521
Nemakit-Daldynian525.5
FortunianCambrian 1Manykaian †529
Jinnigian530.7
538.8