Mollusca (Ammonoidea, Gastropoda, Bivalvia) del Ladiniense superior (Triásico Medio) de la isla de Mallorca (Islas Baleares Mediterráneo occidental): datos preliminares

A group of fossil molluscs with silicified presevation from the Muschelkalk facies (Middle Triassic) of the southwest of Serra de Tramuntana (Mallorca, western Mediterranean), is studied. Due to the biostratigraphical significance of its ammonoids, upper Ladinian is characterized for the first time on the island. In a similar way, the biogeographical context of the area during this interval is analyzed using the ammonoid, gastropoda and bivalvia records in a preliminary approach