The geological map was produced by APAT, the Agency for the Protection of the Environment and for Technical Services, as a summary of the surveys carried out on a national scale as part of the CARG Project, National Geological Cartography, at a scale of 1: 50,000. Some changes were necessary for the volcanic themes of the Neapolitan area.

Geomorphology of Naples and the Campi Flegrei: human and natural landscapes in a restless land