Serravallian

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Serravallian
13.82 – 11.63 Ma
Chronology

The Serravallian is, in the

Ma and 11.63 Ma (million years ago). The Serravallian follows the Langhian and is followed by the Tortonian.[6]

It overlaps with the middle of the

South American Land Mammal Ages. It is also coeval with the Sarmatian and upper Badenian Stages of the Paratethys
time scale of Central and eastern Europe.

Definition

The Serravallian Stage was introduced in stratigraphy by the Italian geologist Lorenzo Pareto in 1865.[7] It was named after the town of Serravalle Scrivia in northern Italy.

The base of the Serravallian is at the first occurrence of fossils of the nanoplankton species Sphenolithus heteromorphus and is located in the chronozone C5ABr. The official Global Boundary Stratotype Section and Point (GSSP) for the Serravallian is in the 'Ras il-Pellegrin' section, located at the 'Ras il-Pellegrin' headland in the vicinity of 'Fomm ir-Rih' Bay, SW Malta.The base of the Serravallian is represented in the field as the formation boundary between the Globigerina Limestone formation and the Blue Clay formation.[8] The base of the Serravallian is related to the Mi3b oxygen isotope excursion marking the onset of the Middle Miocene Cooling step.

The top of the Serravallian (the base of the Tortonian Stage) is at the last common appearance of calcareous nanoplanktons

. It is also associated with the short normal-polarized chronozone C5r.2n.

Paleontology

Cartilaginous fish

Birds

Ancestors of the long-tailed duck have been found dating from the Serravalian of Hungary

Mammals

Reptiles

References

Notes

  1. .
  2. . Retrieved 2008-02-11.
  3. ^ "ICS Timescale Chart" (PDF). www.stratigraphy.org.
  4. . Retrieved 26 December 2020.
  5. . Retrieved 26 December 2020.
  6. ^ Gradstein et al. (2004)
  7. ^ "Lorenzo Pareto, Note sur les subdivisions que l'on pourrait établir dans les terrains tertaires de l'Apennin septentrional In Bulletin de la Société Géologique de France, volume 22, série 2, pp. 210-277" (PDF). Archived from the original (PDF) on 2021-01-15. Retrieved 2013-03-09.
  8. ^ http://www.stratigraphy.org/gssp/[bare URL]
  9. PMID 25338197
    .
  10. ^ Gál, Erika; Hír, János; Kessler, Eugén; Kókay, József (1998–1999). "Középsõ-miocén õsmaradványok, a Mátraszõlõs, Rákóczi-kápolna alatti útbevágásból. I. A Mátraszõlõs 1. lelõhely" [Middle Miocene fossils from the sections at the Rákóczi chapel at Mátraszőlős. Locality Mátraszõlõs I.] (PDF). Folia Historico Naturalia Musei Matraensis (in Hungarian). 23: 33–78. Archived from the original (PDF) on 2011-07-21. Retrieved 2007-02-06.
  11. PMID 19487676
    ..
  12. .

Literature

  • Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004,
    Cambridge University
    Press.
  • Pareto, L.; 1865: Note sur la subdivision que l'on pourrait etablir dans les terrains de l'Apennin septentrional, Bulletin de la Société Géologique de France 2(22), p. 210-277. (in French)

External links