This rock is not as resistant to erosion as the Mn-phosphorite, however, it is still able to withstand the erosive currents of the Gulf Stream and the biological erosion by organisms living on the seafloor. As a result, where foraminiferan limestone is exposed on the seafloor in cliffed areas, it often forms overhanging ledges, providing excellent habitat for fish and other organisms.

Video frame grab from JSLII Dive 3463, Barrelfish Cliff, Blake Plateau (1966 ft).