Pliensbachian

The Pliensbachian ( in German usually shortened to Pliensbach, rarely also Pliensbachien ) is in Earth's history, a chronostratigraphic stage of the Jura, which corresponds to the geochronological division of geological history about the period from 190.8 to about 182.7 million years. On the Pliensbachian follows the Toarcian, the Pliensbachian precedes the Sinemurian.

Naming and history

The Pliensbachian was named after Pliensbach, the smaller the suburb town of Zell unter Aichelberg in the district of Göppingen in the foothills of the central Swabian Alb, about 30 km east of Stuttgart. The stage and the name was introduced by Albert Oppel in 1858.

Definition and GSSP

The beginning is determined by the initial appearance of Bifericeras donovani as well as the genera Apoderoceras and Gleviceras. The end is defined by the first occurrence of the ammonite genus Eodactylites. For Global Stratotype Section and Point ( GSSP corresponding to one type of profile ), the Wine Haven profile in Robin Hood's Bay ( Yorkshire, England) was determined.

Subdivision of the Pliensbachian

The Pliensbachian is in the boreal region ( which includes the southern and northern German law is to be expected ) is currently divided into the following ammonite biozones (from top to bottom):

  • Pleuroceras spinatum
  • Amaltheus margaritatus
  • Prodactylioceras davoei
  • Tragophylloceras ibex
  • Uptonia jamesoni

In the Tethyan area the Pliensbachian ammonite zones correspond to the following:

  • Emaciaticeras emaciatum
  • Arieticeras algovianum
  • Fuciniceras lavinianum
  • Prodactylioceras davoei
  • Tragophylloceras ibex
  • Uptonia jamesoni

Internally, there is a further subdivision into a lower Pliensbachian ( regionally as " Carixium ") and an upper Pliensbachian ( " Domerium ").

Fossils

The Municipal Museum of Natural History in Göppingen shows fossils that time.

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