Age (Ma)
Neogene Miocene Aquitanian younger
Paleogene Oligocene Chattian 23.0 27.8
Rupelian 27.8 33.9
Eocene Priabonian 33.9 37.8
Bartonian 37.8 41.2
Lutetian 41.2 47.8
Ypresian 47.8 56.0
Paleocene Thanetian 56.0 59.2
Selandian 59.2 61.6
Danian 61.6 66.0
Cretaceous Upper/
Maastrichtian older
Subdivision of the Paleogene Period
according to the ICS, as of 2019[1]

The Bartonian is, in the ICS's geologic time scale, a stage or age in the middle Eocene epoch or series. The Bartonian age spans the time between 41.2 and 37.8 Ma. It is preceded by the Lutetian and is followed by the Priabonian age.[2]

Stratigraphic definitionEdit

The Bartonian stage was introduced by Swiss stratigrapher Karl Mayer-Eymar in 1857. The name derives from the coastal village Barton-on-Sea (part of New Milton) in southern England.[citation needed] The Barton Group, a lithostratigraphic unit from the south English Hampshire Basin, is of Bartonian age. The distinction between group and stage was made in the second part of the 20th century, when stratigraphers saw the need to distinguish between litho- and chronostratigraphy.[citation needed]

The base of the Bartonian is at the first appearance of the calcareous nanoplankton species Reticulofenestra reticulata. In 2009, an official reference profile (GSSP) for the base of the Bartonian had not yet been established.[needs update][citation needed]

The top of the Bartonian stage (the base of the Priabonian) is at the first appearance of calcareous nanoplankton species Chiasmolithus oamaruensis (which forms the base of nanoplankton biozone NP18).[citation needed]

The Bartonian stage overlaps part of the upper Robiacian European Land Mammal Mega Zone (it spans the Mammal Paleogene zone 16[3]), the upper Uintan and Duchesnean North American Land Mammal Ages, part of the Divisaderan South American Land Mammal Age and is coeval with the Sharamururian Asian Land Mammal Age.[citation needed]

The Auversian regional stage of France is coeval with the Bartonian and is therefore no longer used.



  1. ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy.
  2. ^ International Commission on Stratigraphy 2017
  3. ^ Alroy, John. "Mammal Paleogene zones". p. The Paleobiology Database. Retrieved 15 July 2009.


  • Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
  • Mayer-Eymar, K.; 1857: Tableau synchronique des formations tertiaires d'Europe, 3rd ed., Zürich. (in French)

External linksEdit