Middle Cenomanian (Rhotomagense zone, Costatus subzone) ammonite assemblage from the carbonate shelf edge sequence of Rocca di Cave (Prenestini Mts., Central Apennines, Italy).

A Middle Cenomanian ammonite assemblage, with Turrilites costatus Lamarck, Sciponoceras roto Cieslinsky and Desmoceras latidorsatum (Michelin) is described for the first time in the Prenestini Mts., along the western margin of the Latium-Abruzzi carbonate platform. The specimens are exceptionally associated with shallow water benthic organisms such as rudists and other bivalves, gastropods, rare brachiopods, corals and benthic foraminifers. This assemblage is found into a sequence of skeletal grainstone and rudstone, typical of shelf edge to slope environment, and is similar to other already described in previous works on this area. This new finding gives further evidence of the Cenomanian transgression which characterised the Latium carbonate platform and testifies of the vicinity and interaction of the open sea. This event is similar and very close in age to that recently studied in the Matese carbonate platform.