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. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) view
  • J. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 view
  • F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 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 126831 collections

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International Chronostratigraphic TimescaleOrdovician of AustraliaCarboniferous of Western EuropeEuropean Faunal ZonesPermian of ChinaPaleogene Mammal Ages of AsiaCambrian of BritainPermian of the PamirsCambrian EpochsEuropean Faunal Units
QuaternaryPleistoceneGelasianMN 171.8
NeogenePliocenePiacenzianMN 16Villanyian2.58
Ruscinian3.1 *
MN 153.2
Zanclean3.6
MN 144.2
MN 134.9
MioceneMessinianTurolian5.333
TortonianMN 127.246
MN 117.75
MN 10Vallesian8.7
MN 99.7
MN 7 + 811.1
SerravallianAstaracian11.63
MN 612.8 *
LanghianMN 513.82
BurdigalianMN 4Orleanian15.98
MN 316.9
MN 2Agenian20
Aquitanian20.44
MN 122.4
PaleogeneOligoceneChattianTabenbulakianHsandagolian23.03
RupelianKekeamuan27.82
EocenePriabonianHouldjinian/Ergilian/Ulangochuian33.9
BartonianSharamurunian/Irdinmanhan/Arshantan37.71
Lutetian41.2
YpresianBumbanian47.8
PaleoceneThanetianGashatan56
Selandian59.2
Danian61.6
CretaceousLate CretaceousMaastrichtian66
Campanian72.1
Santonian83.6
Coniacian86.3
Turonian89.8
Cenomanian93.9
Early CretaceousAlbian100.5
Aptian113
Barremian121.4
Hauterivian125.77
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
PermianLopingianChanghsingianMeishanianDorashamian251.902
Baoqingian253.4 *
WuchiapingianLaoshanianDzhulfian254.14
Laibinian257.7 *
GuadalupianCapitanianLengwuanMidian259.51
WordianKuhfengian264.28
Murgabian266.2 *
Roadian266.9
CisuralianKungurianLuodianianKubergandian273.01
Bolorian279.8
Artinskian283.5
Longlinian285.4 *
Yakhtashian286
SakmarianSakmarian290.1
AsselianZisongianAsselian293.52
Kuzel297.7
CarboniferousPennsylvanianGzhelian298.9
300.1
StephanianStephanian C300.3 *
Stephanian B300.9 *
Stephanian A301.4 *
Kasimovian303.7
Cantabrian305 *
Moscovian307
WestphalianWestphalian D307.4 *
Westphalian C309.8
Westphalian B314.6
Bashkirian315.2
Westphalian A317 *
NamurianYeadonian318.8 *
Marsdenian320.2 *
Kinderscoutian321.5 *
Alportian322 *
Chokierian323.1 *
MississippianSerpukhovian323.2
Arnsbergian324 *
Pendleian327.4 *
ViseanWarnantianBrigantian †330.9
LivianAsbian †336.3 *
MoliniacianHolkerian †/Arundian/Chadian340.2 *
TournaisianIvorian346.7
Hastarian353.7 *
DevonianLate DevonianFamennian358.9
Frasnian372.2
Middle DevonianGivetian382.7
Eifelian387.7
Early DevonianEmsian393.3
Pragian407.6
Lochkovian410.8
SilurianPridoli419.2
LudlowLudfordian423
Gorstian425.6
WenlockHomerian427.4
Sheinwoodian430.5
LlandoveryTelychian433.4
Aeronian438.5
Rhuddanian440.8
OrdovicianLate OrdovicianHirnantianBolindian443.8
Katian445.2
Eastonian449 *
Gisbornian452 *
Sandbian453
Middle OrdovicianDarriwilianDarriwilian458.4
DapingianYapeenian467.3
Castlemainian468.5 *
Early OrdovicianFloianChewtonian470
Bendigonian471.8 *
Lancefieldian473.5 *
Tremadocian477.7
Warendian482.8 *
CambrianFurongianStage 10MerionethDolgellian/TrempealeauanLate Cambrian485.4
Festiniogian489.2 *
Jiangshanian489.5
Maentwrogian493.1 *
Paibian494
MiaolingianGuzhangianSt DavidsMiddle Cambrian497
Drumian500.5
Wuliuan504.5
Series 2Stage 4CaerfaiEarly Cambrian509
Stage 3514
TerreneuvianStage 2521
Fortunian529
538.8