6-8 m thick mounds.
Basal dimensions 12-18 m. 
Developed on emersion surfaces. 
Micrite matrix. Dm-sized colonies of corals (Microsolenidae, Thamnasteriidae, Stylinidae) and stromatoporoids, spiculate siliceous sponges (Corynella, Barroisia) and chaetetids. Rudists subordinate. Some bryozoans, calcareous algae, enrusting forams and worms.
Lithophagid borings abundant.
Vertical zonation almost absent.