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
  • M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
  • J. Alroy. 2000. New methods for quantifying macroevolutionary patterns and processes. Paleobiology 26(4):707-733 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
  • 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
  • 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
  • M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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 126762 collections

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International Chronostratigraphic TimescaleNorth American Mammal Subages/ZonesCretaceous-Cenozoic of New ZealandCambrian of ChinaOrdovician of Ibero-BohemiaCambrian of KazakhstanCenozoic SubepochsCambrian of SiberiaMammal Paleogene ZonesCarboniferous of China
QuaternaryHoloceneMeghalayanWanganuiHaweran0
Northgrippian0.0042
Greenlandian0.0082
PleistoceneLate PleistoceneSheridanianLate Pleistocene0.0117
ChibanianMiddle Pleistocene0.129
Cudahyan/Sappan0.21
Castlecliffian0.34
CalabrianEarly Pleistocene0.774
Senecan/Rexroadian1.4
Nukumaruan1.63
Gelasian1.8
Mangapanian2.4
NeogenePliocenePiacenzianLate Pliocene2.58
Waipipian3
ZancleanEarly Pliocene3.6
Opoitian3.7
Late Hemphillian/late Early Hemphillian/early Early Hemphillian4.7
MioceneMessinianTaranakiKapiteanLate Miocene5.333
Tongaporutuan7.2
Tortonian7.246
Late Clarendonian/Early Clarendonian9.4
SouthlandWaiauan11.04
SerravallianMiddle Miocene11.63
late Late Barstovian/early Late Barstovian/Early Barstovian12.5
Lillburnian13.05
Langhian13.82
Clifdenian15.1
PareoraAltonian15.9
BurdigalianEarly Miocene15.98
Late Hemingfordian/Early Hemingfordian16.3
late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early ArikareeanHarrisonian18.5
Otaian18.7
Aquitanian20.44
LandonWaitakian21.7
PaleogeneOligoceneChattianLate OligoceneMP 30/MP 29/MP 28/MP 27/MP 26MP 2523.03
Monroecreekian23.1 *
Geringian24.7 *
Duntroonian25.2
Whaingaroan27.3
RupelianEarly OligoceneMP 24/MP 23/MP 22/MP 2127.82
29.5
EocenePriabonianLate Chadronian/Middle Chadronian/Early ChadronianLate EoceneMP 20/MP 19/MP 18/MP 17B/MP 17A33.9
ArnoldRunangan34.6
Kaiatan36.7
37
BartonianMiddle EoceneMP 1637.71
Bortonian39.1
Late Uintan/Early Uintan39.7
LutetianMP 15/MP 14/MP 13/MP 12/MP 1141.2
DannevirkePorangan42.6
Heretaungan45.7
Twinbuttean/Blacksforkian/Gardnerbuttian46.2
YpresianEarly EoceneMP 10/MP 8 + 9/MP 747.8
Mangaorapan48.9
Lostcabinian/Lysitean/Graybullian/Sandcouleean50.5
Waipawan52
Cf3/Cf2/Cf154.9
PaleoceneThanetianTeurianLate PaleoceneMP 6MP 1 - 556
Ti6/Ti5/Ti4/Ti3/Ti2/Ti156.2
SelandianMiddle Paleocene59.2
To3/To2/To160.9
DanianEarly Paleocene61.6
Pu3/Pu2/Pu163.8
CretaceousLate CretaceousMaastrichtianMataHaumurian66
Campanian72.1
SantonianPiripauan83.6
RaukumaraTeratan86.1
Coniacian86.3
Turonian89.8
Mangaotanean90.5
Arowhanan93.7
Cenomanian93.9
ClarenceNgaterian95.2
Motuan99.5
Early CretaceousAlbian100.5
Urutawan103.3
TaitaiKorangan108.4
Aptian113
117.5
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
PermianLopingianChanghsingian251.902
Wuchiapingian254.14
GuadalupianCapitanian259.51
Wordian264.28
Roadian266.9
CisuralianKungurian273.01
Artinskian283.5
Sakmarian290.1
Asselian293.52
CarboniferousPennsylvanianGzhelian298.9
Xiaodushanian300 *
Kasimovian303.7
Dalaun305.8 *
Moscovian307
Bashkirian315.2
Huashibanian318.5 *
Lousuan321.2 *
MississippianSerpukhovianDewunian323.2
Shangsian330.8 *
Visean330.9
Jiusian335 *
TournaisianTangbagouan346.7
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 OrdovicianHirnantianKosovian443.8
KatianKralodvorianBohdalec †445.2
Berounian449.7 *
Sandbian453
Zahorany †/ViniceLetna †456.2 *
Liben †458 *
Middle OrdovicianDarriwilian458.4
Dobrotivian458.5 *
Oretanian459.7 *
Sarka †461.7 *
DapingianKlabava †467.3
Arenigian468
Early OrdovicianFloian470
TremadocianTremadocianUngurian477.7
Mansian †483.55 *
CambrianFurongianStage 10NiucheheanTaoyuanian †BatyrbaianBatyrbaianTavgian †Ketyan †/Yurakian485.4
JiangshanianJiangshanian489.5
AksaianAksaian490.7 *
SakianSakian492.2 *
PaibianPaibian494
Ensyan †/Maduan/Nganasanian494.7 *
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianGuzhangianWangcunian †AyusokkanianAyusokkanian497
Mayan/Menevian499.5
DrumianDrumianZhanaarykian500.5
Tuesaian503
WuliuanWuliuan/TaijangianAmgan/Solvan504.5
505.3
Series 2Stage 4Duyunian509
ToyonianToyonianLenian †510 *
BotomianBotomian512.5 *
Stage 3Nangaoian514
AtdabanianAtdabanian515.6 *
TerreneuvianStage 2MeishucunianTommotianTommotian521
Nemakit-Daldynian525.5
FortunianManykaian †529
Jinnigian530.7
538.8