Reef formed largely of calcisponge floatstones and/or framestones. The spaces between the rigid framework formed by the sponges are filled with wackestones and packstones that contain numerous benthic foraminifers (Palaeofusulina, Colaniella, Glomospira), green algae (Dasycladales and Mizzia), and crinoids and bivalve fragments.

Formation original was Changhsing. 
Comments from Tian & Wang, 2021:

Reef builders: Frame-building and baffling
organisms: hypercalcified sphinctozoan and inozoan sponges, sclerosponges, bryozoans, and hydrozoans
Binding organisms: Archaeolithoporella, Tubiphytes, and cyanobacteria.

Reef dwellers: Echinoderms, ostracodes, bivalves, brachiopods,gastropods, benthic foraminifera, calcareous algae, and single rugose corals.

Rock type and reef-related depositional characteristic: Fore-reef slope: packstone with
floatstone and reef breccias
Reef core: sponge framestone and bafflestone, Archaeolithoporella and cyanobacteria bindstone, and sponge framestone with the encrusting Archaeolithoporella.
Reef flat (reef crest): algal-foraminiferal packstone with reef breccia.
Reef base: bioclastic packstone to grainstone.

Reef type: Metazoan reef at the shallow carbonate platform margin.

Coordinates stated in text.



