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
  • F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
  • B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
  • F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view
  • F. F. Steininger, W. A. Berggren, D. V. Kent, R. L. Bernor, S. Sen and J. Agusti. 1996. Circum-Mediterranean Neogene (Miocene and Pliocene) marine-continental chronologic correlations of European mammal units. The Evolution of Western Eurasian Neogene Mammal Faunas (eds. R. L. Bernor, V. Fahlbusch, and H.-W. Mittmann) 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 126831 collections

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International Chronostratigraphic TimescaleOrdovician of ChinaCambrian of KazakhstanOrdovician of Australia
OrdovicianLate OrdovicianHirnantianHirnantianXiaoxita †/ShikouWufeng †Bolindian443.8
KatianChientangkiangian445.2
Eastonian449 *
Neichianshanian/Hanjiang449.5
Gisbornian452 *
Sandbian453
Middle OrdovicianDarriwilianDarriwilianGuniu †/HuloDarriwilian458.4
Hunjiang †Dawan †/Daobaowan/Ningkuo466.3 *
DapingianDapingianYapeenian467.3
Castlemainian468.5 *
Early OrdovicianFloianYiyangianChewtonian470
Bendigonian471.8 *
Lancefieldian473.5 *
TremadocianXinchangianUngurian477.7
Lianghekou †477.9 *
Warendian482.8 *
485.4