Very sparse features that are similar in nature to patch reefs, but are on the outer reef tract. These areas are dominantly sand or a veneer of sand over low relief rock. Scattered throughout are small patches ranging from a single gorgonian, sponge, or small coral head up to a low assemblage that may be a few meters to 10m across. These patches make up a low percentage of the total cover, yet are distinctive. This class is found mainly in the area from Big Pine Shoal to Sombrero Light, and may be associated with the lack of a developed forereef structure in this area.
Corals here are widely spaced individuals on a rubble platform.
May form transverse features perpendicular to line of reef tract. Depth ranges from intertidal to approximately 7m in deep tidal channels and the inside edge of Hawk Channel. May include a thin veneer of carbonate sand or mud, too thin and unstable to support seagrass. Bare Substrate Open and essentially unvegetated, with no benthic community visible on photographs, due to unstable nature of substrate. Can be large seagrass blowouts or active erosional features.