Excavations at Tiemassas (IMAGE) Max Planck Institute of Geoanthropology Caption The excavation site at Tiémassas, which preserves evidence for Middle Stone Age occupations spanning 62-25 thousand years ago Credit K. Niang Usage Restrictions Please provide credit information with reuse 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.