After walking about 700 m, you will arrive at Portella Colla (Board D). A few metres before the crossroads you turn left along the dirt road and come to P.O. 14. Here the Numidian Flysch shales outcrop again. In this area the succession is called "Membro di Portella Colla" and has different features from the former Numidian Flysch: there are intercalations of arenaceous layers with macroforaminifera and an increase of iron oxide content. The geological path ends at P.O. 14, where you can return to Board Aby walking along the road in the direction of Piano Battaglia. Estimated time for the return is about one hour.