On the co-occurrence of Rubroceras and Vascoceras (Ammonoidea, Vascoceratidae) in the upper Cenomanian of the West Portuguese Carbonate Platform

1. Callapez, P.M.
2. Barroso-Barcenilla, F.
3. Soares, A.F.
4. Segura, M.
5. Santos, V.F.