Obsolete Names for ICS Units

The interval definitions in this timescale are derived from the following sources:

  • 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
  • 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, 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
  • J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 view
  • B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
  • M. Freudenthal. 2006. Mammal Paleogene zones. personal communication view

There are 55 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 92 collections

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International Chronostratigraphic TimescaleObsolete Names for ICS UnitsTen Million Year BinsCenozoic SubepochsPermian of North AmericaCretaceous North American Land-Mammal AgesOrdovician of BritainOrdovician of the BalticPermian of the Russian PlatformOrdovician of ChinaDevonian of CzechoslovakiaMammal Paleogene Zones
QuaternaryHoloceneMeghalayanCenozoic 60
Northgrippian0.0042
Greenlandian0.0082
PleistoceneLate PleistoceneLate Pleistocene0.0117
ChibanianMiddle Pleistocene0.129
CalabrianEarly Pleistocene0.774
Gelasian1.8
NeogenePliocenePiacenzianTertiary †Late Pliocene2.58
ZancleanEarly Pliocene3.6
MioceneMessinianLate Miocene5.333
Tortonian7.246
SerravallianCenozoic 5Middle Miocene11.63
Langhian13.82
BurdigalianEarly Miocene15.98
Aquitanian20.44
PaleogeneOligoceneChattianCenozoic 4Late OligoceneMP 30/MP 29/MP 28/MP 27/MP 26MP 2523.03
RupelianEarly OligoceneMP 24/MP 23/MP 22/MP 2127.82
EocenePriabonianCenozoic 3Late EoceneMP 20/MP 19/MP 18/MP 17B/MP 17A33.9
BartonianMiddle EoceneMP 1637.71
LutetianCenozoic 2MP 15/MP 14/MP 13/MP 12/MP 1141.2
YpresianEarly EoceneMP 10/MP 8 + 9/MP 747.8
PaleoceneThanetianCenozoic 1Late PaleoceneMP 6MP 1 - 556
SelandianMiddle Paleocene59.2
DanianEarly Paleocene61.6
CretaceousLate CretaceousMaastrichtianCretaceous 8Lancian/Edmontonian66
CampanianCretaceous 7Judithian/Aquilan72.1
SantonianCretaceous 683.6
Coniacian86.3
Turonian89.8
CenomanianCretaceous 593.9
Early CretaceousAlbianCretaceous 4100.5
AptianCretaceous 3113
BarremianCretaceous 2121.4
Hauterivian125.77
ValanginianCretaceous 1132.6
Berriasian139.8
JurassicLate JurassicTithonianJurassic 6145
KimmeridgianJurassic 5149.2
Oxfordian154.8
Middle JurassicCallovian161.5
BathonianJurassic 4165.3
Bajocian168.2
AalenianJurassic 3170.9
Early JurassicToarcian174.7
PliensbachianJurassic 2184.2
SinemurianJurassic 1192.9
Hettangian199.5
TriassicLate TriassicRhaetianTriassic 4201.4
Norian208.5
CarnianTriassic 3227
Middle TriassicLadinianTriassic 2237
Anisian242
Early TriassicOlenekianTriassic 1247.2
Induan251.2
PermianLopingianChanghsingianPermian 4251.902
WuchiapingianLongtanian †254.14
TatarianVyatkian256.8 *
GuadalupianCapitanianCapitanianSeverodvinian259.51
WordianWordianUrzhumian264.28
RoadianPermian 3RoadianKazanianPovolzhian266.9
Sokian270.7 *
CisuralianKungurianPermian 2LeonardianCathedralianKungurianIrenian/Ufimian273.01
Filipovian276.5 *
Saraninian280.1 *
Hessian281.9 *
ArtinskianArtinskianSarginian283.5
Irginian285.9 *
WolfcampianLenoxian286.1 *
Burtsevian287.8 *
SakmarianSakmarianSterlitamakian290.1
Tastubian291.7 *
AsselianPermian 1NealianAsselianShikhanian293.52
Uskalykian294.8
Surenian297.5
CarboniferousPennsylvanianGzhelianCarboniferous 5298.9
Kasimovian303.7
MoscovianCarboniferous 4307
Bashkirian315.2
MississippianSerpukhovianCarboniferous 3323.2
ViseanCarboniferous 2330.9
TournaisianCarboniferous 1346.7
DevonianLate DevonianFamennianDevonian 5358.9
FrasnianDevonian 4372.2
Middle DevonianGivetianDevonian 3Srbsko382.7
EifelianChotec387.7
Early DevonianEmsianDevonian 2Daleje/Zlichovian393.3
PragianDevonian 1Pragian407.6
LochkovianLochkovian410.8
SilurianPridoliSilurian 2419.2
LudlowLudfordian423
Gorstian425.6
WenlockHomerian427.4
Sheinwoodian430.5
LlandoveryTelychianSilurian 1433.4
Aeronian438.5
Rhuddanian440.8
OrdovicianLate OrdovicianHirnantianOrdovician 5AshgillHirnantianHarjuPorkuniHirnantianXiaoxita †/ShikouWufeng †443.8
KatianRawtheyanPirguChientangkiangian445.2
Cautleyan448.9 *
Pusgillian449.3 *
Neichianshanian/Hanjiang449.5
CaradocStreffordianOnnian †Vormsi449.6 *
NabalaJohvi †450 *
ViruRakvere450.6 *
Cheneyan451.5 *
Oandu452 *
Burrellian452.7 *
SandbianOrdovician 4KeilaIdavere †453
Actonian †453.2 *
Haljala453.9
Marshbrookian †Woolstonian †454.2 *
Longvillian †455.2 *
Kukruse456.4 *
Aurelucian456.8 *
Soudleyan †/Harnagian/Costonian457.4 *
UhakuAluoja †457.5 *
Middle OrdovicianDarriwilianOrdovician 3LlanvirnLlandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late LlanvirnDarriwilianGuniu †/Hulo458.4
Lasnamagi458.9 *
Aseri460.4 *
Abereiddian/Early Llanvirn461.3 *
OelandKunda462.9 *
Valaste †/Hunderum464.3 *
Hunjiang †Dawan †/Daobaowan/Ningkuo466.3 *
VolkhovLangevoja †/Vaana/Saka467.1 *
DapingianOrdovician 2Dapingian467.3
ArenigFennian468.4 *
Billingen469.3 *
Early OrdovicianFloianYiyangian470
Latorp †470.1 *
Whitlandian471.1 *
Hunneberg473.7 *
Moridunian474.3 *
TremadocianOrdovician 1TremadocMigneintianXinchangian477.7
Lianghekou †477.9 *
Cressagian480.8 *
Varangu481.3 *
Pakerort482.2 *
485 *
CambrianFurongianStage 10Cambrian 5485.4
486.3 *
486.5
Jiangshanian489.5
Paibian494
MiaolingianGuzhangianSeries 3 †Cambrian 4497
Drumian500.5
WuliuanStage 5 †Cambrian 3504.5
Series 2Stage 4509
Stage 3Cambrian 2514
TerreneuvianStage 2521
FortunianCambrian 1529
538.8