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. 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
  • M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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

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 126710 collections

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International Chronostratigraphic TimescaleTen Million Year BinsCambrian of ChinaCretaceous-Cenozoic of New ZealandMammal Paleogene ZonesPermian-Jurassic of New ZealandCarboniferous SubepochsObsolete Names for ICS Units
QuaternaryHoloceneMeghalayanCenozoic 6WanganuiHaweran0
Northgrippian0.0042
Greenlandian0.0082
PleistoceneLate Pleistocene0.0117
Chibanian0.129
Castlecliffian0.34
Calabrian0.774
Nukumaruan1.63
Gelasian1.8
Mangapanian2.4
NeogenePliocenePiacenzianTertiary †2.58
Waipipian3
Zanclean3.6
Opoitian3.7
MioceneMessinianTaranakiKapitean5.333
Tongaporutuan7.2
Tortonian7.246
SouthlandWaiauan11.04
SerravallianCenozoic 511.63
Lillburnian13.05
Langhian13.82
Clifdenian15.1
PareoraAltonian15.9
Burdigalian15.98
Otaian18.7
Aquitanian20.44
LandonWaitakian21.7
PaleogeneOligoceneChattianCenozoic 4MP 30/MP 29/MP 28/MP 27/MP 26MP 2523.03
Duntroonian25.2
Whaingaroan27.3
RupelianMP 24/MP 23/MP 22/MP 2127.82
EocenePriabonianCenozoic 3MP 20/MP 19/MP 18/MP 17B/MP 17A33.9
ArnoldRunangan34.6
Kaiatan36.7
BartonianMP 1637.71
Bortonian39.1
LutetianCenozoic 2MP 15/MP 14/MP 13/MP 12/MP 1141.2
DannevirkePorangan42.6
Heretaungan45.7
YpresianMP 10/MP 8 + 9/MP 747.8
Mangaorapan48.9
Waipawan52
PaleoceneThanetianCenozoic 1TeurianMP 6MP 1 - 556
Selandian59.2
Danian61.6
CretaceousLate CretaceousMaastrichtianCretaceous 8MataHaumurian66
CampanianCretaceous 772.1
SantonianCretaceous 6Piripauan83.6
RaukumaraTeratan86.1
Coniacian86.3
Turonian89.8
Mangaotanean90.5
Arowhanan93.7
CenomanianCretaceous 593.9
ClarenceNgaterian95.2
Motuan99.5
Early CretaceousAlbianCretaceous 4100.5
Urutawan103.3
TaitaiKorangan108.4
AptianCretaceous 3113
117.5
BarremianCretaceous 2121.4
Hauterivian125.77
ValanginianCretaceous 1132.6
Berriasian139.8
JurassicLate JurassicTithonianJurassic 6OtekePuaroan145
KimmeridgianJurassic 5149.2
KawhiaOhauan150
Heterian154.5
Oxfordian154.8
Middle JurassicCallovian161.5
Temaikan164.3
BathonianJurassic 4165.3
Bajocian168.2
AalenianJurassic 3170.9
Early JurassicToarcian174.7
HerangiUruroan176
PliensbachianJurassic 2184.2
Aratauran188.9
SinemurianJurassic 1192.9
Hettangian199.5
TriassicLate TriassicRhaetianTriassic 4BalfourOtapirian201.4
NorianWarepan208.5
Otamitan217
Oretian221
CarnianTriassic 3227
GoreKaihikuan227.5
Middle TriassicLadinianTriassic 2237
Etalian238
Anisian242
Malakovian246
Early TriassicOlenekianTriassic 1247.2
Nelsonian249
Induan251.2
DUrvilleMakarewan251.5
PermianLopingianChanghsingianPermian 4251.902
Waiitian253.2
WuchiapingianLongtanian †254.14
Puruhauan254.2
GuadalupianCapitanianAparimaFlettian259.51
Wordian264.28
Barettian266
RoadianPermian 3266.9
CisuralianKungurianPermian 2273.01
Mangapirian276
Artinskian283.5
Telfordian285
288.5
Sakmarian290.1
AsselianPermian 1293.52
CarboniferousPennsylvanianGzhelianCarboniferous 5Late Pennsylvanian298.9
Kasimovian303.7
MoscovianCarboniferous 4Middle Pennsylvanian307
BashkirianEarly Pennsylvanian315.2
MississippianSerpukhovianCarboniferous 3Late Mississippian323.2
ViseanCarboniferous 2Middle Mississippian330.9
TournaisianCarboniferous 1Early Mississippian346.7
DevonianLate DevonianFamennianDevonian 5358.9
FrasnianDevonian 4372.2
Middle DevonianGivetianDevonian 3382.7
Eifelian387.7
Early DevonianEmsianDevonian 2393.3
PragianDevonian 1407.6
Lochkovian410.8
SilurianPridoliSilurian 2419.2
LudlowLudfordian423
Gorstian425.6
WenlockHomerian427.4
Sheinwoodian430.5
LlandoveryTelychianSilurian 1433.4
Aeronian438.5
Rhuddanian440.8
OrdovicianLate OrdovicianHirnantianOrdovician 5443.8
Katian445.2
SandbianOrdovician 4453
Middle OrdovicianDarriwilianOrdovician 3458.4
DapingianOrdovician 2467.3
Early OrdovicianFloian470
TremadocianOrdovician 1477.7
CambrianFurongianStage 10Cambrian 5NiucheheanTaoyuanian †485.4
JiangshanianJiangshanian489.5
PaibianPaibian494
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianCambrian 4GuzhangianWangcunian †Series 3 †497
DrumianDrumian500.5
WuliuanCambrian 3Wuliuan/TaijangianStage 5 †504.5
Series 2Stage 4Duyunian509
Stage 3Cambrian 2Nangaoian514
TerreneuvianStage 2Meishucunian521
FortunianCambrian 1529
Jinnigian530.7
538.8