Cresting the ledge of the terrace wall’s vertical scarp, light sedimentation was observed on flat layers of hard sedimentary rock substrate. Much of the rocky substrate is buried in a thin veneer of sediments. A large bamboo coral (foreground, left) and sponge (white organism, right of center in the back) are examples of the large individuals found at the scarp’s top. [Laser beams are 10 cm apart.]