Priabonian

The Priabonian is, in the ICS's geologic timescale, the latest age or the upper stage of the Eocene epoch or series. It spans the time between 37.8 and 33.9 Ma. The Priabonian is preceded by the Bartonian and is followed by the Rupelian, the lowest stage of the Oligocene.[2]

System/
Period		 Series/
Epoch		 Stage/
Age		 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/
Late		 Maastrichtian older
Subdivision of the Paleogene Period
according to the ICS, as of 2019.[1]

Stratigraphic definition

The Priabonian stage was introduced in scientific literature by Ernest Munier-Chalmas and Albert de Lapparent in 1893. The stage is named after the small hamlet of Priabona in the community of Monte di Malo, in the Veneto region of northern Italy.

The base of the Priabonian stage is at the first appearance of calcareous nanoplankton species Chiasmolithus oamaruensis (which forms the base of nanoplankton biozone NP18). An official GSSP had in 2009 not yet been assigned.

The top of the Priabonian stage (the base of the Rupelian stage and Oligocene series) is at the extinction of foram genus Hantkenina.

Sometimes local rock strata cannot be correlated in sufficient detail with the ICS timescale, and stratigraphers often use regional timescales as alternatives to the ICS timescale. The Priabonian overlaps for example the upper Johannian and lower Aldingan stages of the Australian timescale or the upper Nanzian and lower Refugian stages of the Californian timescale. Other regional stages which are more or less coeval with the Priabonian include the Jacksonian of the southeastern US and Runangan of New Zealand.

In biostratigraphy, the Priabonian stage is coeval with the Chadronian North American Land Mammal Age, the Headonian European Land Mammal Mega Zone (in more detail: with the Mammal Paleogene zones 17A through 20[3]), parts of the Barrancan and Mustersan South American Land Mammal Ages and the Ulangochuian and Ergilian Asian Land Mammal Ages.

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

Literature
  • Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
  • Munier-Chalmas, E. & de Lapparent, A.; 1893: Note sur la nomenclature des terrains sédimentaires, Bulletin de la Societé Géologique de France 3(21), p. 479-480. (in French)
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