Langhium

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system series step ≈ age ( mya )
after that after that after that younger
Neogene Pliocene Piacenzium 2.588
⬍
3.6
Zancleum 3.6
⬍
5.333
Miocene Messinium 5.333
⬍
7,246
Tortonium 7,246
⬍
11.62
Serravallium 11.62
⬍
13.82
Langhium 13.82
⬍
15.97
Burdigalium 15.97
⬍
20.44
Aquitanium 20.44
⬍
23.03
before before before older

The Langhian is in the geological the third chronostratigraphic stage of Miocene ( Neogen ) and the lower level of the Middle Miocene. Geochronologically, the stage represents the period from about 15.97 to about 13.82 million years. The level follows the Burdigalium and is replaced by the Serravallium .

Naming and history

The name of the stage comes from the Langhe landscape , which extends to the right of the Tanaro River in the province of Cuneo and Asti in Piedmont ( northern Italy ). The stage and name were proposed and introduced into scientific literature by Italian geologist Lorenzo Pareto in 1864.

Definition and GSSP

The lower limit of the level is determined by the Ersteinsetzen the Foraminiferen -type Praeorbulina glomerosa defined or the upper limit of the magnetic polarity Chrono C5Cn.1n zone. The boundary to the following stage of the Serravallium is due to the first appearance of the Nannofossil species Sphenolithus heteromorphus . It lies within the magnetic polarity chronozone C5ABr. An official type profile (GSSP = "Global Stratotype Section and Point") has not yet been defined by the International Commission for Stratigraphy.

literature

  • Lorenzo Pareto: Note on the subdivision que l'on pourrait established dans les terrains de l'Apennin septentrional. In: Bulletin de la Societé Géologique de France. série 2, 22, Paris 1864, pp. 210-277, ISSN  0037-9409 .
  • Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2004, ISBN 978-0-521-78673-7

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