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, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
  • M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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

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

Show more time

Show linear time

International Chronostratigraphic TimescaleObsolete Names for ICS UnitsCambrian of KazakhstanOrdovician of North AmericaCarbo-Permian of the Russian PlatformDevonian of CzechoslovakiaSilurian of EnglandTen Million Year BinsPermian of the Salt RangePermian-Jurassic of New ZealandDevonian of France
QuaternaryHoloceneMeghalayanCenozoic 60
Northgrippian0.0042
Greenlandian0.0082
PleistoceneLate Pleistocene0.0117
Chibanian0.129
Calabrian0.774
Gelasian1.8
NeogenePliocenePiacenzianTertiary †2.58
Zanclean3.6
MioceneMessinian5.333
Tortonian7.246
SerravallianCenozoic 511.63
Langhian13.82
Burdigalian15.98
Aquitanian20.44
PaleogeneOligoceneChattianCenozoic 423.03
Rupelian27.82
EocenePriabonianCenozoic 333.9
Bartonian37.71
LutetianCenozoic 241.2
Ypresian47.8
PaleoceneThanetianCenozoic 156
Selandian59.2
Danian61.6
CretaceousLate CretaceousMaastrichtianCretaceous 866
CampanianCretaceous 772.1
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 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
KathwaiDUrvilleMakarewan251.5 *
PermianLopingianChanghsingianMelekhovianPermian 4251.902
252.4 *
Chhidru252.9 *
Waiitian253.2
WuchiapingianLongtanian †254.14
Puruhauan254.2
Kalabagh255 *
Wargal256 *
GuadalupianCapitanianAparimaFlettian259.51
Wordian264.28
Noginskian264.9 *
265.3 *
Barettian266
Amb266.1 *
RoadianPermian 3266.9
270.7 *
CisuralianKungurianPermian 2273.01
Mangapirian276
Pavlovoposadian276.8 *
Artinskian283.5
Telfordian285
Rusavkinian287.6 *
288.5
Sakmarian290.1
AsselianPermian 1293.52
CarboniferousPennsylvanianGzhelianCarboniferous 5298.9
KasimovianDorogomilovian303.7
Khamovnikian304.8
Krevyakinian305.8 *
MoscovianMyachkovianCarboniferous 4307
Podolskian308.9 *
Kashirian311.4 *
Vereian313.8
Melekessian314.8
Bashkirian315.2
Cheremshanian316.9 *
Prikamian318.6 *
Severokeltmian319.9 *
Krasnopolyanian321.2 *
Voznesenian321.9 *
MississippianSerpukhovianZapaltjubianCarboniferous 3323.2
Protvian324.4 *
Steshevian326.8 *
Tarusian329 *
ViseanVenevianCarboniferous 2330.9
Mikhailovian331.9 *
Aleksinian333.7 *
Tulian335.8 *
Bobrikian339.9 *
Radaevkian343.4 *
TournaisianKosvianCarboniferous 1346.7
Kizelian350.7 *
Cherepetian351.9 *
Karakubian354.4 *
Upinian356.3 *
Malevkian357.6 *
Gumerovian358 *
DevonianLate DevonianFamennianDevonian 5Famennian358.9
FrasnianDevonian 4Frasnian372.2
Middle DevonianGivetianSrbskoDevonian 3Givetian382.7
EifelianChotecCouvinien387.7
Early DevonianEmsianDaleje/ZlichovianDevonian 2393.3
PragianPragianDevonian 1407.6
Coblencien408.2 *
LochkovianLochkovianGedinnine410.8
SilurianPridoliRed Downtonian/Temeside Shales/Downton CastleWhitcliffe/LeintwardineSilurian 2419.2
Bringewood/Elton421.3
LudlowLudfordianCoalbrookdaleWenlock (England)/Tickwood423
Gorstian425.6
Buildwas426.4 *
WenlockHomerian427.4
WychWoolhope428.4 *
Sheinwoodian430.5
LlandoveryTelychianSilurian 1433.4
436.3 *
Aeronian438.5
Cowleigh Park439.3 *
Rhuddanian440.8
OrdovicianLate OrdovicianHirnantianCincinnatianGamachianOrdovician 5443.8
Katian445.2
Richmondian446 *
MaysvillianRocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian449.8 *
Edenian450.4 *
MohawkianChatfieldian451.1 *
SandbianOrdovician 4453
Turinian453.7 *
WhiterockianCanadian †Chazyan †/Marmor457 *
Middle OrdovicianDarriwilianOrdovician 3458.4
DapingianOrdovician 2467.3
Rangerian469.1 *
Early OrdovicianFloianIbexianBlackhillsianJeffersonian †Cassinian †470
Tulean473.9 *
TremadocianUngurianOrdovician 1477.7
Stairsian480.3 *
SkullrockianDemingian †482 *
CambrianFurongianStage 10BatyrbaianCambrian 5485.4
487.5
Jiangshanian489.5
Aksaian490.7 *
Sakian492.2 *
Paibian494
MiaolingianGuzhangianSeries 3 †AyusokkanianCambrian 4497
499.5
DrumianZhanaarykian500.5
Tuesaian503
WuliuanStage 5 †Cambrian 3504.5
505.3
Series 2Stage 4509
Toyonian510 *
Botomian512.5 *
Stage 3Cambrian 2514
Atdabanian515.6 *
TerreneuvianStage 2Tommotian521
525.5
FortunianCambrian 1529
538.8