Iceberg scours on the seafloor

This 3D perspective view of seafloor bathymetry, from multibeam sonar data collected offshore of South Carolina, show numerous grooves carved by drifting icebergs. As iceberg keels plow into the seafloor, they dig deep grooves that push aside boulders and piles of sand and mud along their tracks. Sediment cores from nearby buried iceberg scours were used to determine when these icebergs travelled south along the coast.