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
  • J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) 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 127245 collections

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International Chronostratigraphic TimescaleCarbo-Permian of the Russian PlatformCarboniferous of Western EuropeSilurian of EnglandCarboniferous of ChinaPermian-Jurassic of New ZealandOrdovician of Britain
QuaternaryHoloceneMeghalayan0
Northgrippian0.0042
Greenlandian0.0082
PleistoceneLate Pleistocene0.0117
Chibanian0.129
Calabrian0.774
Gelasian1.8
NeogenePliocenePiacenzian2.58
Zanclean3.6
MioceneMessinian5.333
Tortonian7.246
Serravallian11.63
Langhian13.82
Burdigalian15.98
Aquitanian20.44
PaleogeneOligoceneChattian23.03
Rupelian27.82
EocenePriabonian33.9
Bartonian37.71
Lutetian41.2
Ypresian47.8
PaleoceneThanetian56
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 JurassicTithonianOtekePuaroan145
Kimmeridgian149.2
KawhiaOhauan150
Heterian154.5
Oxfordian154.8
Middle JurassicCallovian161.5
Temaikan164.3
Bathonian165.3
Bajocian168.2
Aalenian170.9
Early JurassicToarcian174.7
HerangiUruroan176
Pliensbachian184.2
Aratauran188.9
Sinemurian192.9
Hettangian199.5
TriassicLate TriassicRhaetianBalfourOtapirian201.4
NorianWarepan208.5
Otamitan217
Oretian221
Carnian227
GoreKaihikuan227.5
Middle TriassicLadinian237
Etalian238
Anisian242
Malakovian246
Early TriassicOlenekian247.2
Nelsonian249
Induan251.2
DUrvilleMakarewan251.5
PermianLopingianChanghsingianMelekhovian251.902
Waiitian253.2
Wuchiapingian254.14
Puruhauan254.2
GuadalupianCapitanianAparimaFlettian259.51
Wordian264.28
Noginskian264.9 *
Barettian266
Roadian266.9
CisuralianKungurian273.01
Mangapirian276
Pavlovoposadian276.8 *
Artinskian283.5
Telfordian285
Rusavkinian287.6 *
288.5
Sakmarian290.1
Asselian293.52
Kuzel297.7
CarboniferousPennsylvanianGzhelian298.9
Xiaodushanian300 *
StephanianStephanian C300.3 *
Stephanian B300.9 *
Stephanian A301.4 *
KasimovianDorogomilovian303.7
Khamovnikian304.8
Cantabrian305 *
KrevyakinianDalaun305.8 *
MoscovianMyachkovian307
WestphalianWestphalian D307.4 *
Podolskian308.9 *
Westphalian C309.8
Kashirian311.4 *
Vereian313.8
Westphalian B314.6
Melekessian314.8
Bashkirian315.2
Cheremshanian316.9 *
Westphalian A317 *
Huashibanian318.5 *
Prikamian318.6 *
NamurianYeadonian318.8 *
Severokeltmian319.9 *
Marsdenian320.2 *
KrasnopolyanianLousuan321.2 *
Kinderscoutian321.5 *
Voznesenian321.9 *
Alportian322 *
Chokierian323.1 *
MississippianSerpukhovianZapaltjubianDewunian323.2
Arnsbergian324 *
Protvian324.4 *
Steshevian326.8 *
Pendleian327.4 *
Tarusian329 *
Shangsian330.8 *
ViseanVenevianWarnantianBrigantian †330.9
Mikhailovian331.9 *
Aleksinian333.7 *
Jiusian335 *
Tulian335.8 *
LivianAsbian †336.3 *
Bobrikian339.9 *
MoliniacianHolkerian †/Arundian/Chadian340.2 *
Radaevkian343.4 *
TournaisianKosvianIvorianTangbagouan346.7
Kizelian350.7 *
Cherepetian351.9 *
Hastarian353.7 *
Karakubian354.4 *
Upinian356.3 *
Malevkian357.6 *
Gumerovian358 *
DevonianLate DevonianFamennian358.9
Frasnian372.2
Middle DevonianGivetian382.7
Eifelian387.7
Early DevonianEmsian393.3
Pragian407.6
Lochkovian410.8
SilurianPridoliRed Downtonian/Temeside Shales/Downton CastleWhitcliffe/Leintwardine419.2
Bringewood/Elton421.3
LudlowLudfordianCoalbrookdaleWenlock (England)/Tickwood423
Gorstian425.6
Buildwas426.4 *
WenlockHomerian427.4
WychWoolhope428.4 *
Sheinwoodian430.5
LlandoveryTelychian433.4
436.3 *
Aeronian438.5
Cowleigh Park439.3 *
Rhuddanian440.8
OrdovicianLate OrdovicianHirnantianAshgillHirnantian443.8
KatianRawtheyan445.2
Cautleyan448.9 *
Pusgillian449.3 *
CaradocStreffordianOnnian †449.6 *
Cheneyan451.5 *
Burrellian452.7 *
Sandbian453
Actonian †453.2 *
Marshbrookian †Woolstonian †454.2 *
Longvillian †455.2 *
Aurelucian456.8 *
Soudleyan †/Harnagian/Costonian457.4 *
Middle OrdovicianDarriwilianLlanvirnLlandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn458.4
Abereiddian/Early Llanvirn461.3 *
Dapingian467.3
ArenigFennian468.4 *
Early OrdovicianFloian470
Whitlandian471.1 *
Moridunian474.3 *
TremadocianTremadocMigneintian477.7
Cressagian480.8 *
485 *
CambrianFurongianStage 10485.4
Jiangshanian489.5
Paibian494
MiaolingianGuzhangian497
Drumian500.5
Wuliuan504.5
Series 2Stage 4509
Stage 3514
TerreneuvianStage 2521
Fortunian529
538.8