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Additional info for General Field Trip Guidebook, 6th International Symposium on the Jurassic System, 12-22 September 2002, Palermo, Italy

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Although no amm onites were found, the occurrence o f Saccocoma at the base and o f Calpionella alpina at the top indicate that this level spans the Kim m eridgian-early Berriasian interval. A sharp discontinuity surface, underlined by firm ground burrows and glauconite m ineralizations (Fig. e. between the Rosso Am m onitico and Lattim usa Formations). Level 6 (170 cm): evenly bedded white mudstones referable to the upper Berriasian based on the association o f Calpionellopsis oblonga and Calpionella elliptica.

15 - Stops 12-15. STOP 1 - MONTE GALLO: A JURASSIC ANGULAR UNCONFORMITY MARKED BY b a u x i t e s in t h e p a n o r m i d e c a r b o n a t e PLATFORM P. Di S t e f a n o , G . M a l l a r i n o , A . M i n d s e n t y & D. N i c c h i t t a M onte Gallo, near M ondello, is an isolated massif, bordered by Plio-Pleistocene faults rising from the Palermo plain along the Tyrrhenian coast. It exposes mostly M esozoic to Eocene shallow-w ater dolostones and limestones, that are onlapped by Pleistocene calcarenites.

In the largest dykes, up to 10 m wide megablocks o f the Inici Form ation (Fig. 17) collapsed into the fracture, still bearing on their top beds o f Rosso Am m onitico, several decimetres thick. These blocks float in a grey matrix with a chaotic structure, again referable to the Rosso Am m onitico Formation. The characteristic shape and limited areal extent o f some o f the dykes, that change Fig. 17 - Rocca chi Parra quarry. Very large neptunian dyke within the Inici Fm. Note the huge block o f Inici limestone encased in a chaotic Rosso Ammonitico matrix; it bears on top some decimetres o f Rosso Ammonitico sediments showing that the opening o f this dyke took place after the beginning of pelagic sedimentation.

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