See reef 2503.
Usually small, reef complexes up to 10 m and 60-80 m in extremes. Up to 1.3 km across.
Microbes Girvanella and Renalcis common.
Abundant algae Contexta, Mastopora, Vermiporella, Palaeoporella, Coelosphaeridium, Apidium.
Rare corals