Up to 700 m thick reef.
Principal components: Halysites, Syringopora, Holacantia, Zelophyllum, Pseudoamplexus, Pseudomicroplasma, Girvanella, Renalcis, Ikella, Epiphyton, Fistulella and small bryozoans.
Tabulate corals and algae (or stromatopores?).
