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
  • 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
  • F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
  • J. Meng and M. C. McKenna. 1998. Faunal turnovers of Paleogene mammals from the Mongolian Plateau. Nature 394:364-367 view
  • M. Freudenthal. 2006. Mammal Paleogene zones. personal communication view

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This timescale is used in the definition of 126662 collections

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International Chronostratigraphic TimescaleCenozoic SubepochsPaleogene Mammal Ages of AsiaMammal Paleogene Zones
PaleogeneOligoceneChattianLate OligoceneTabenbulakianHsandagolianMP 30/MP 29/MP 28/MP 27/MP 26MP 2523.03
RupelianEarly OligoceneKekeamuanMP 24/MP 23/MP 22/MP 2127.82
EocenePriabonianLate EoceneHouldjinian/Ergilian/UlangochuianMP 20/MP 19/MP 18/MP 17B/MP 17A33.9
BartonianMiddle EoceneSharamurunian/Irdinmanhan/ArshantanMP 1637.71
LutetianMP 15/MP 14/MP 13/MP 12/MP 1141.2
YpresianEarly EoceneBumbanianMP 10/MP 8 + 9/MP 747.8
PaleoceneThanetianLate PaleoceneGashatanMP 6MP 1 - 556
SelandianMiddle Paleocene59.2
DanianEarly Paleocene61.6
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