This pavement slab is extremely thin (2 to 3 cm), but it is very dense and very
resistant to erosion. Many octocorals (white tree-like organisms)attach themselves to the
pavement's smooth, tough surface. In areas of high current velocities, such as are found
beneath the Gulf Stream, erosion-resistant rock serves as critical habitat for
sessile invertebrates.

Collected on JSLII Dive 3461, top pavement of Sponge Cliff, Blake Plateau (1700 ft).