Austroalpine Liassic Ammonites from the Adnet Formation (Northern Calcareous Alps)

Content Provider	Semantic Scholar
Author	Meister, Christian Böhm, Florian
Copyright Year	1993
Abstract	The Upper Austroalpine occupies a key position for the understanding of the patterns of Liassic ammonite distribution and for making precise correlation between the Tethyan and Euroboreal realms. The collection of a Middle Liassic ammonite fauna (more than 500 specimens) from four localities in the Northern Calcareous Alps (Salzburg area and southern Dachstein) allows us to establish a set of 21 horizons or biostratigraphicallevels for the Adnet Formation. These units are readily correlated with parts of the NW European standard zonation and parts of the zonation used for the Tethyan realm. The Semicostatum, Obtusum and Raricostatum zones for the Sinemurian stage and the Jamesoni, Ibex, Davoei and Margaritatus zones for the Pliensbachian stage are identified in the formation with ammonites. The faunal composition clearly indicates the Tethyan affinities of the Upper Austroalpine; but this alpine unit is constantly subject to Euroboreal influences, marked especially by the presence of Asterocerasaff. confusumand aff. stel/are, Tragophylloceras, Platypleuroceras, Uptonia, Acanthopleuroceras, Liparoceratidae, Prodactylioceras davoei, Amaltheidae, P (Matteiceras), P (Fieldingiceras). Les ammonites austroalpines de la Formation d'Adnet au Lias (Alpes calcaires septentrionales)
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Language	English
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Content Type	Text
Resource Type	Article