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Bartonian

 
Sci-Tech Dictionary: Bartonian
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(bär′tōn·ē·ən)

(geology) A European stage: Eocene geologic time above Auversian, below Ludian. Also known as Marinesian.

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System Series Stage Age (Ma)
Neogene Miocene Aquitanian younger
Paleogene Oligocene Chattian 23.03–28.4
Rupelian 28.4–33.9
Eocene Priabonian 33.9–37.2
Bartonian 37.2–40.4
Lutetian 40.4–48.6
Ypresian 48.6–55.8
Paleocene Thanetian 55.8–58.7
Selandian 58.7–61.7
Danian 61.7–65.5
Cretaceous Upper Maastrichtian older
Subdivision of the Paleogene period according to the IUGS, as of July 2009.

The Bartonian is, in the ICS's geological timescale, a stage or age in the middle Eocene epoch or series. The Bartonian age spans the time between 40.4 ± 0.2 Ma and 37.2 ± 0.2 Ma (million years ago). It is preceded by the Lutetian and is followed by the Priabonian age.[1]

Contents

Stratigraphic definition

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. 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.

The base of the Bartonian is at the first appearance of the calcareous nannoplankton species Reticulofenestra reticulata. In 2009, an official reference profile (GSSP) for the base of the Bartonian had not yet been established.

The top of the Bartonian stage (the base of the Priabonian) is at the first appearance of calcareous nannoplankton species Chiasmolithus oamaruensis (which forms the base of nannoplankton biozone NP18).

The Bartonian stage overlaps part of the upper Robiacian European Land Mammal Mega Zone (it spans the Mammal Paleogene zone 16[2]), 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.

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

References

Footnotes

  1. ^ Gradstein et al. (2004)
  2. ^ Alroy, John. "Mammal Paleogene zones". p. The Paleobiology Database. http://paleodb.org/cgi-bin/bridge.pl?action=processViewScale&scale_no=125. Retrieved 15 July 2009. 

Literature

  • 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. (French)

External links

Paleogene period
Paleocene epoch Eocene epoch Oligocene epoch
Danian | Selandian
Thanetian		 Ypresian | Lutetian
Bartonian | Priabonian		 Rupelian | Chattian

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

 
 
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Ludian (geology)
Priabonian (geology)
Pyrenean orogeny (geology)

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