A. Schematic geological map of the Sardinia Oligo-Miocene Graben (SGS) and of the superimposed Late Miocene to Recent Campidano Graben (Cherchi and Montadert, 1982) with the location of the two Saras Spa surveys (Eleonora and Igia) on the Campidano Graben. Area of deposition of the Cixerri Fm (Middle Lutetian to Late Chattian) is indicated with sediments transport direction. B. Schematic cross sections through the SGS (Cherchi, 1985). Sediments thickness is very underestimated in the grabens. Morphology shows that the area of extension is wider than the area where syn-rift sediments are preserved. Surveys are located on the Campidano Graben (sections B and C) about 20 km wide superimposed on the SGS about 100 km wide.