 The Gargano Promontory and the Maiella Mountain, which now is part of the external Apennine thrust belt, are the only areas where the transition from platform facies to basin facies is exposed on land.In the Gargano area this transition has been investigated extensively in the last decade.Since the mid-1960s AGIP geologists and the Italian Geological Survey recognized that the western part of the promontory is part of the shallow-water Apulia Platform, whereas the eastern part is characterized by slope and basinal deposits.