Bone Fragments (IMAGE) Max-Planck-Gesellschaft Caption On both the bones found in Dikika, Ethiopia, unambiguous evidence of stone tool use in the form of cut marks and percussion marks were found. Credit Image: Dikika Research Project 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.