Digital image in .jpg format depicting in two views (A and B) a beachrock platform exposed at 3.7 m water depth at Location BR-1 at Kalamianos (Peloponnesos). the beachrock contains abundant Mycenaean pottery sherds (20-40%) and wood charcoal indicating deposition in a supratidal position, i.e. on a beach. The beachrock's upper surface provides an indication of the the sea level and the shoreline position during the Mycenaean occupationb phase.