Abstract
Abstract Numerous pebbles of vein quartz, silicified limestone, arkosic sandstone, granite, and rhyolite have been found in Plaisancian (Tertiary) pyroclastic deposits underlying marls of Ail cape (Alpes-Maritimes) on the French Riviera. These pebbles are very different from those on the mainland; they were probably derived from an ancient upland on the site of the present Gulf of Genoa, which sank to depths of more than 2,700 meters as a result of crustal deformation in the Pliocene.
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