Upper Burdigalian reefs on coarse gravel-dominates delta fronts. 
Other reef near S of Bolasan.
Diverse coral assemblage (16 species). 
Most important: Tarbellastraea, Heliastraea, Porites, Caulastaea and Stylophora.
Densely packed massive domeal, hemispherical and branching corals bound by coralline algae (Lithothamnium, Lithophyllum) and encrusting forams (Acervulina). 