Reef flats/caps contain mainly light gray crystal grain dolomites and sparry calcarenite. Reef cores are mostly sponge reef dolomites with the framework filled up by bioclasts and sand cuttings and contain a low content of calcilutite. Reef bases are less dolomitized and largely bioclastic limestones with bioclasts dominated by metacrinus and foraminifera.

Original Interval (Lopingian) was changed belated (Xuesong Tian, Yue Wang). 