Sponges, bryozoans, stromatopores, algae are dominant.
Boundstone patches (saccoliths)
Maximum thickness 80 m.
Includes Laolongdong locality

Comments from Tian & Wang, 2021:
Reef builders:
Frame-building and baffling organisms: hypercalcified sphinctozoan and inozoan sponges, sclerosponges, less rugose corals.
Binding organisms: Archaeolithoporella, Tubiphytes, cyanobacteria, and Fistulipora.

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

Rock type and reef-related depositional characteristic:
Reef core: sponge bafflestone and sponge-Tubiphytes-Archaeolithoporella-cyanobacteria bindstone.
Reef flat: bioclastic fusulinid-brachiopod-crinoid packstone with reef breccia.
Reef crest: algal wackestone to packstone and micritic dolostone with evaporite.
Reef base: crinoidal packstone-grainstone.

Reef type: Skeletal mound at the carbonate intraplatform.
Coordinates stated in text.

Comments for Wenxingchang from Tian & Wang, 2021:
Reef builders:
Frame-building and baffling organisms: hypercalcified sphinctozoan and inozoan sponges and bryozoans.
Binding organisms: Tubiphytes and cyanobacteria.

Reef dwellers: Echinoderms, brachiopods, gastropods, benthic foraminifera, and calcareous algae.

Rock type and reef-related depositional characteristic:
Reef core:  less sponge framestone and more bafflestone and sponge-Tubiphytes-cyanobacteria bindstone.

Reef type: Skeletal mound at the carbonate intraplatform.
Coordinates stated in text: 106.50 E, 29.87 N, 40 m (part thick-ness).

Comments for Laolongdong from Tian & Wang, 2021:
Reef builders: Frame-building and baffling organisms: hypercalcified sphinctozoan and inozoan sponges, hydrozoans, and bryozoans.
Binding organisms: Archaeolithoporella, Tubiphytes, sclerosponge, and cyanobacteria.

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

Rock type and reef-related depositional characteristic:
Reef core: sponge and hydrozoan bafflestone
Reef flat: bioclastic Colaniella- bryozoan-crinoid packstone to grainstone and bryozoan-echinoderm wackestone with reef breccia
Reef crest: foraminiferal-algal wackestone to packstone Reef base: bryozoan-crinoid packstone.

Reef type: Skeletal mound at the carbonate intraplatform.
Coordinates stated in text: 106.51E, 29.89N 36.33 m thick.