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
- M. Freudenthal. 2006. Mammal Paleogene zones. personal communication view
- F. J. Prevosti, C. O. Romano, A. M. Forasiepi, S. Hemming, R. Bonini, A. M. Candela, E. Cerdeño, M. C. Madozzo Jaén, P. E. Ortiz, F. Pujos, L. Rasia, G. I. Schmidt, M. Taglioretti, R. D. E. MacPhee, and U. F. J. Pardiñas. 2021. New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America. Scientific Reports 2021(11):9830 view
- J. J. Flynn and C. C. Swisher, III. 1995. Cenozoic South American Land Mammal Ages: correlation to global geochronology. Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication 54:317-333 view
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
- B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 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 127243 collections
| International Chronostratigraphic Timescale | Ten Million Year Bins | Ordovician of Britain | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | Ordovician 5 | Ashgill | Hirnantian | 443.8 | ||||
| Katian | Rawtheyan | 445.2 | ||||||||
| Cautleyan | 448.9 * | |||||||||
| Pusgillian | 449.3 * | |||||||||
| Caradoc | Streffordian | Onnian † | 449.6 * | |||||||
| Cheneyan | 451.5 * | |||||||||
| Burrellian | 452.7 * | |||||||||
| Sandbian | Ordovician 4 | 453 | ||||||||
| Actonian † | 453.2 * | |||||||||
| Marshbrookian † | Woolstonian † | 454.2 * | ||||||||
| Longvillian † | 455.2 * | |||||||||
| Aurelucian | 456.8 * | |||||||||
| Soudleyan †/Harnagian/Costonian | 457.4 * | |||||||||
| Middle Ordovician | Darriwilian | Ordovician 3 | Llanvirn | Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn | 458.4 | |||||
| Abereiddian/Early Llanvirn | 461.3 * | |||||||||
| Dapingian | Ordovician 2 | 467.3 | ||||||||
| Arenig | Fennian | 468.4 * | ||||||||
| Early Ordovician | Floian | 470 | ||||||||
| Whitlandian | 471.1 * | |||||||||
| Moridunian | 474.3 * | |||||||||
| Tremadocian | Ordovician 1 | Tremadoc | Migneintian | 477.7 | ||||||
| Cressagian | 480.8 * | |||||||||
| 485 * | ||||||||||
| 485.4 | ||||||||||