General Field Trip Guidebook, 6th International Symposium on by Santantonio M. (Ed.)

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

Sample text

This set o f beds, which reaches a m axim um thickness o f about 1 m, is characterized by a dark grey colour and can be correlated with levels 1-4 o f Section A in Fig. 18. M ost o f the beds are fossiliferous and have m arkedly different ages. M ore in particular, the palaeontological-biostratigraphical features o f beds A to E are as follows: Bed A: It contains Choffatia caroli, C. leptonata, and C. (Subgrossouvria) recuperoi, which indicate the lower Callovian and in particular the m iddle part o f the M acrocephalites gracilis Zone.

The nodules are smaller, usually less than 3 cm across, have a flatter overall shape and are m ade up o f Saccocom a wackestone. The contrast with the matrix, a Saccocom a packstone, is more m arked than in the other levels. The abundance o f clay along dissolution seams testifies the intensive pressure dissolution experienced by becom es m ore and more micritic, and radiolarians appear. The topm ost strata pass gradually to the white mudstones o f the Lattim usa Formation. On a recently reactivated quarry front, very interesting post-depositional structures are observable within levels 4 to 6 (Fig.

The boundary with the Rosso A m m onitico is a planar surface, that only very locally shows the pillars encrusted by Fe-M n oxides described in the previous stop. , easily distinguished through the dark grey colour o f their infill. Dykes range from horizontal to vertical, and from few centim etres to several m etres in width. Different generations o f neptunian dykes have been identified. Some o f them are sealed by the first beds o f Rosso Am m onitico, whereas others cut through them. This is confirm ed by a direct dating o f the dyke fillings, which is possible in a few cases.

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