AMMONITE BIOSTRATIGRAPHY OF THE PLIENSBACHIAN STAGE IN THE UPPER AUSTROALPINE JURASSIC

A set of 20 biostratigraphic horizon, o, levels based on ammonites is given for the Pliensbachian of the Upper Austroalpine nappes. This bio stratigraphical framework is compared and correlated with those of NW Europe (Euroboreal Realm) and Central Apennines (Tethyan Realm). The ' 'key'' position of the Upper Austroalpine is underlined by these corre lations. In the lower, Carixian Substage, many of the horizons corresp ond to those of the NW European zonation, while others, mainly in the upper, Domerian Substage, are well correlated with the Tethyan zonatio n.