spongework

   1. Randomly shaped cavities created by undirected phreatic dissolution in a massive, essentially homogeneous limestone. Fine examples occur in Carlsbad Caverns, New Mexico [9].

   2. An arrangement of partitioned depressions found in cave ceilings and walls, and attributed to the differential solution of submerged karst limestones. Larger and more isolated hollows are known as ‘pockets’ [19].