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
  • 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
  • F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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.

This timescale is used in the definition of 126973 collections

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International Chronostratigraphic TimescaleDevonian of FranceCambrian EpochsCambrian of AustraliaPermian Subages of GermanyCarboniferous of ChinaCarboniferous SubepochsCretaceous SubepochsDevonian of Germany
CretaceousLate CretaceousMaastrichtianSenonian66
Campanian72.1
Santonian83.6
Coniacian86.3
Turonian89.8
Cenomanian93.9
Early CretaceousAlbianGallic100.5
Aptian113
Barremian121.4
HauterivianNeocomian125.77
Valanginian132.6
Berriasian139.8
JurassicLate JurassicTithonian145
Kimmeridgian149.2
Oxfordian154.8
Middle JurassicCallovian161.5
Bathonian165.3
Bajocian168.2
Aalenian170.9
Early JurassicToarcian174.7
Pliensbachian184.2
Sinemurian192.9
Hettangian199.5
TriassicLate TriassicRhaetian201.4
Norian208.5
Carnian227
Middle TriassicLadinian237
Anisian242
Early TriassicOlenekian247.2
Induan251.2
PermianLopingianChanghsingianBuntsandstein251.902
Wuchiapingian254.14
GuadalupianCapitanianOhre/Aller259.51
WordianLeine264.28
Roadian266.9
CisuralianKungurian273.01
Artinskian283.5
Sakmarian290.1
Asselian293.52
CarboniferousPennsylvanianGzhelianLate Pennsylvanian298.9
Xiaodushanian300 *
Kasimovian303.7
Dalaun305.8 *
MoscovianMiddle Pennsylvanian307
BashkirianEarly Pennsylvanian315.2
Huashibanian318.5 *
Lousuan321.2 *
MississippianSerpukhovianDewunianLate Mississippian323.2
Shangsian330.8 *
ViseanMiddle Mississippian330.9
Jiusian335 *
TournaisianTangbagouanEarly Mississippian346.7
DevonianLate DevonianFamennianFamennianWocklum/Dasberg/Hemberg/Nehden358.9
FrasnianFrasnianAdorf372.2
Middle DevonianGivetianGivetianGivetian382.7
EifelianCouvinienEifelian387.7
Early DevonianEmsianEmsian393.3
PragianSiegen407.6
Coblencien408.2 *
LochkovianGedinnineGedinnine410.8
SilurianPridoli419.2
LudlowLudfordian423
Gorstian425.6
WenlockHomerian427.4
Sheinwoodian430.5
LlandoveryTelychian433.4
Aeronian438.5
Rhuddanian440.8
OrdovicianLate OrdovicianHirnantian443.8
Katian445.2
Sandbian453
Middle OrdovicianDarriwilian458.4
Dapingian467.3
Early OrdovicianFloian470
Tremadocian477.7
CambrianFurongianStage 10Late CambrianDatsonian485.4
Payntonian486.8 *
JiangshanianIverian489.5
PaibianIdamean494
MiaolingianGuzhangianMiddle CambrianMindyallan497
Boomerangian499
DrumianUndillan500.5
Floran503
WuliuanTempletonian504.5
Ordian507.8 *
Series 2Stage 4Early Cambrian509
510.8 *
Stage 3514
TerreneuvianStage 2521
Fortunian529
538.8