Hantang  mounds  represent  a  microbe-dominated  reef-building  community
with rare skeletal reef builders. The microbial mounds are composed almost exclusively of calcimicrobes, including Renalcis, Rothpletzella, Girvanell, Izhella, Ortonella, Wetheredella and a Stenophycus-like microbe. Mound-building metazoans and metaphytes include receptaculitids, solenoporoid algae, spiculate and stromatoporoid sponges, and massive corals, but the volumes of these skeletal organisms  are low. Synsedimentary cements are volumetrically important in the mounds and supported  and  reinforced the microbial  frameworks. The microbial facies can be divided into five sub-facies. In roughly ascending stratigraphic order, they are:(i) Rothpletzella-receptaculitid fabric; (ii) Rothpletzella boundstone fabric: (iii)stromatolite-thrombolite fabric;(iv) Rothpletzella-encruster fabric; and (v)Renalcis fabric.