Deep river sediments at Nal Quarry (IMAGE) Max Planck Institute of Geoanthropology Caption Prof. Hema Achyuthan examining the deep river sediments at Nal Quarry, which date from ~172 thousand years ago at the bottom to 26 thousand years ago at the top. Credit J. Blinkhorn Usage Restrictions Use only with appropriate credit 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.