Several reefs mapped by logging. Reef facies extends without interruption for at least 5 km.

Comments from Tian & Wang, 2021:

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

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

Rock type and reef-related depositional characteristic:
Fore-reef slope: spiculitic-calcispherical cherty wackestone with reef breccias.
Reef core: sponge framestone and bafflestone, Archaeolithoporella and cyanobacteria bindstone, and sponge framestone with the encrusting Archaeolithoporella.
Reef flat (reef crest): packstone with reef breccia.
Reef base: echinodermal packstone to grainstone.
Back-reef lagoon: bioclastic packstone with calcareous algae, gastropods, and foraminifers.

Reef type:
Metazoan reef at the shallow carbonate platform margin





