Sardinian Stone Tower (IMAGE) University of Chicago Caption The s'Orcu 'e Tueri nuraghi, one of many distinctive Sardinian Bronze Age stone towers dating to the mid- to late 2nd millennium BC, at a site including in the study. Credit Gruppo Grotte Ogliastra Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.