STRATIGRAPHIC ARCHITECTURE AND COMPOSITION OF THE PERMIAN AND TRIASSIC SILICICLASTIC SUCCESSION OF NURRA(NORTHWESTERN SARDINIA)

This work representsa preliminary revision of the terrigenousPermian and Triassic stratigraphic successionso f theNurra region (northwestern Sardinia). On the basis of lithostratigraphical, sedimentological and petrographice evidence supported by scattered and rare biostratigraphical data, the wholepost-Variscan successiohna is subdivided into the followingunits: I) the "Punta Lu Caparoni Formation" (PLC), made by thetraditional lluvial-to-lacustrin depositsa II) a volcanic-bearing unit of problematic geochemistry, scarcely cropping out in the Lu Caparoni-Cala Viola area and well-documented in the Monte Santa Giusta section, where shows an alkaline composition; III) a clastic unit of reddish conglomerates sandstones and minor pelites, rich in volcanic-derived clasts.