Three stages in reefal development:
Top: Dominated by corals.
Middle: Sponges-corals and some stromatopores.
Base: Algae (Thaumatoporella, Solenopora, Paleodasycladus, Triporella, Macroporella)-solitary corals-stromatopores-sponges and rare bryozoans.

According to ref. 1972 almost 50 % rudists(?) and 25 % microbialties.