No tuff here-but no shortage of rocks-the whole area is limestone and was a sea bottom-there is a pricey product called Austin shell limestone that contains pretty snail fossils-it is cut into bricks and used for facades of homes...
I lived in Naples for a time, there is a section of the original road to Rome near Arco Felice that is still being used. It is rough as it is cobblestone type road. The Roman engineers who designed this method of construction would no doubt be proud to know that their efforts are still doing their job over 2000 years later. Simply amazing.