Sardinia is much older than the italian Peninsula. Its structure is complex and differtiated. It has areas of granite, of volcanic rocks and large karst areas.
The north and the south east is built on granites, forming a unique landscape with strange rock formations. The west is volcanic with basalt and other volcanic rocks. The east is coverd with slate and calcareous sediments. The south west is famous for its ressources like coal and lead and tin ores. They were mined two thousand years ago by Romans and Phenicians.