Producing and prospective oil and gas provinces of Italy are parts of an extensive sedimentary basin which occupied the Po basin, the east coast of the peninsula, and southern Sicily in upper Tertiary time. They are characterized by the presence of a thick series of marine marls, clays, and sands overlying Mesozoic limestones and shales, and locally concealed by horizontal Quaternary deposits. Details of oil and gas occurrence, exploration, and development are given for the Po basin, and surface indications and possibilities are summarized for the Marches-Abruzzi coastal plain, the Campanian and Lucanian basins, south Sicily, and four small Quaternary embayments on the west coast.

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