Rounded Pebbles (IMAGE) University of Copenhagen - Niels Bohr Institute Caption The individual stones in the area are rounded like pebbles on Danish shores and were probably transported down through a ravine, Peace Vallis, which is carved in the southern slope of the northern crater wall. Credit Malin Space Science Systems Usage Restrictions Malin Space Science Systems 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.