Bartonian

Source: Wikipedia, the free encyclopedia.
Not to be confused with the Bortonian of the New Zealand geologic time scale.

Bartonian
41.2 – 37.71 Ma
↓
Chronology

The Bartonian is, in the

Epoch or Series. The Bartonian Age spans the time between 41.2 and 37.71 Ma. It is preceded by the Lutetian and is followed by the Priabonian Age.[4]

Stratigraphic definition

The Bartonian Stage was introduced by

Barton-on-Sea (part of New Milton) in southern England.[5] 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

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

Asian Land Mammal Age. [citation needed
]

The

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

References

Footnotes

  1. doi:10.1016/j.gloplacha.2005.01.001
    .
  2. ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy.
  3. hdl:2158/1209925
    .
  4. ^ International Commission on Stratigraphy 2017
  5. ^ "Barton Group". British Geological Survey. UKRI. Retrieved 23 November 2023.
  6. ^ Alroy, John. "Mammal Paleogene zones". p. The Paleobiology Database. Retrieved 15 July 2009.

Literature

Wikisource has original works on the topic: Cenozoic#Paleogene
  • 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 links

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