The Zhongxinzhai section (25° 30′ 33.5″ N, 106° 12′
08.0″ E), s 78 m thick with a skeletal–cement–microbial reef (SCMR-3, bed 4) in the upper part.
microbial–phylloid algal reef at the base
Cement-rich microbial carbonates and colonial
rugose corals (Ivanovia) are the main reef builders in the lower middle part
The upper part of the reef is mainly constructed by small scale cement-rich microbial boundstone, including phylloid algae, bryozoans, calcisponges, and tube-shape algae