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
  • M. Freudenthal. 2006. Mammal Paleogene zones. personal communication 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
  • B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 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

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International Chronostratigraphic TimescaleObsolete Names for ICS UnitsMammal Paleogene ZonesCarboniferous of ChinaDevonian of Eastern North AmericaOrdovician of BritainNorth American Mammal Subages/ZonesPaleogene Mammal Ages of AsiaPermian of the PamirsPermian-Jurassic of New ZealandCambrian of North AmericaDevonian Subages
QuaternaryPleistoceneLate PleistoceneSheridanian0.0117
Chibanian0.129
Cudahyan/Sappan0.21
Calabrian0.774
Senecan/Rexroadian1.4
Gelasian1.8
NeogenePliocenePiacenzianTertiary †2.58
Zanclean3.6
Late Hemphillian/late Early Hemphillian/early Early Hemphillian4.7
MioceneMessinian5.333
Tortonian7.246
Late Clarendonian/Early Clarendonian9.4
Serravallian11.63
late Late Barstovian/early Late Barstovian/Early Barstovian12.5
Langhian13.82
Burdigalian15.98
Late Hemingfordian/Early Hemingfordian16.3
late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early ArikareeanHarrisonian18.5
Aquitanian20.44
PaleogeneOligoceneChattianMP 30/MP 29/MP 28/MP 27/MP 26MP 25TabenbulakianHsandagolian23.03
Monroecreekian23.1 *
Geringian24.7 *
RupelianMP 24/MP 23/MP 22/MP 21Kekeamuan27.82
29.5
EocenePriabonianMP 20/MP 19/MP 18/MP 17B/MP 17ALate Chadronian/Middle Chadronian/Early ChadronianHouldjinian/Ergilian/Ulangochuian33.9
37
BartonianMP 16Sharamurunian/Irdinmanhan/Arshantan37.71
Late Uintan/Early Uintan39.7
LutetianMP 15/MP 14/MP 13/MP 12/MP 1141.2
Twinbuttean/Blacksforkian/Gardnerbuttian46.2
YpresianMP 10/MP 8 + 9/MP 7Bumbanian47.8
Lostcabinian/Lysitean/Graybullian/Sandcouleean50.5
Cf3/Cf2/Cf154.9
PaleoceneThanetianMP 6MP 1 - 5Gashatan56
Ti6/Ti5/Ti4/Ti3/Ti2/Ti156.2
Selandian59.2
To3/To2/To160.9
Danian61.6
Pu3/Pu2/Pu163.8
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
PermianLopingianChanghsingianDorashamian251.902
Waiitian253.2
WuchiapingianLongtanian †Dzhulfian254.14
Puruhauan254.2
GuadalupianCapitanianMidianAparimaFlettian259.51
Wordian264.28
Barettian266
Murgabian266.2 *
Roadian266.9
CisuralianKungurianKubergandian273.01
Mangapirian276
Bolorian279.8
Artinskian283.5
Telfordian285
Yakhtashian286
288.5
SakmarianSakmarian290.1
AsselianAsselian293.52
CarboniferousPennsylvanianGzhelian298.9
Xiaodushanian300 *
Kasimovian303.7
Dalaun305.8 *
Moscovian307
Bashkirian315.2
Huashibanian318.5 *
Lousuan321.2 *
MississippianSerpukhovianDewunian323.2
Shangsian330.8 *
Visean330.9
Jiusian335 *
TournaisianTangbagouan346.7
DevonianLate DevonianFamennianConewangan/Conneautan/CanadawayLate Famennian358.9
Middle Famennian365.3 *
Early Famennian368.5 *
FrasnianWest Fallsian/SonyeanLate Frasnian372.2
Middle Frasnian375.4 *
Early Frasnian379.3 *
Middle DevonianGivetianGeneseean/Taghanican/TioughnioganCazenovianLate Givetian382.7
Middle Givetian383.7 *
Early Givetian385.9 *
EifelianSouthwoodianLate Eifelian387.7
Early Eifelian390.3 *
Early DevonianEmsianSawkillian/Deer ParkianHelderbergianLate Emsian393.3
Early Emsian398.3 *
PragianPragian407.6
LochkovianLate Lochkovian410.8
Middle Lochkovian412.8 *
Early Lochkovian415.6 *
SilurianPridoli419.2
LudlowLudfordian423
Gorstian425.6
WenlockHomerian427.4
Sheinwoodian430.5
LlandoveryTelychian433.4
Aeronian438.5
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 10Franconian †/Dresbachian/Millardan485.4
Sunwaptan487.5
Jiangshanian489.5
Steptoean493 *
Paibian494
MiaolingianGuzhangianSeries 3 †MarjumianAlbertian †497
Drumian500.5
WuliuanStage 5 †Topazan504.5
Delamaran506.5
Series 2Stage 4Waucoban †509
Dyeran511 *
Stage 3514
Montezuman514.8 *
Begadean519.9 *
TerreneuvianStage 2521
Fortunian529
538.8