Bioherms are lenticular and consist of thromolites, Renalcis, diverse corals,  and solenoporid algae 
In latest Visean mounds sponges become important.
Surrounded by oolitic limestones.
Core facies is coral boundstone: Siphonodendron, Lithostotion, Multithecopora.
Tyrpanites borings
Largest reef is 15 m thick.

Abstract of Ref. 1848:
Although skeletal organisms have received most of the emphasis in studies on Phanerozoic reef history, the roles of non-skeletal (non-enzymatic) carbonates (e.g., synsedimentary cements, automicrite, microbialite, etc.) in reef framework construction are becoming increasingly better understood. One problem in understanding the role of non-enzymatic carbonates in reef construction has been the difficulty in recognizing them in reef facies. Whereas skeletal organisms commonly can be recognized and documented in the field, non-enzymatic carbonates may be recognizable only in thin section. This paper describes the application of a new sampling technique that allows the quantitative comparison of skeletal macrofauna and flora with associated non-enzymatic carbonates and other microfaunal/microfloral constituents. The technique involves the point counting of thin sections made from small diameter cores that are systematically recovered from grids and line transects that cover a reasonable area (m2) of reef facies. Small, shallow-water patch reefs are abundant in scattered oolitic intervals in the Lower Carboniferous strata of eastern Australia. The youngest known Carboniferous reefs in eastern Australia occur in uppermost Visean strata (limestone FC5) near the top of the Rockhampton Group, approximately 50 km west-northwest of Rockhampton, Queensland. The largest sampled reef was 15 m thick and 42 m in diameter, with synsedimentary relief above the sea floor of at least 2 m during the primary growth phase. The reef occurs within bioclastic-oolitic grainstones representing a shallow shelf setting and consists of eight common framework microfacies: 1) coral boundstone. 2) bryozoan boundstone. 3) mixed crinoid-bryozoan boundstone. 4) tubular problematica boundstone. 5) sponge-automicrite boundstone. 6) encrusted thrombolite boundstone. 7) mixed automicrite boundstone. and 8) thrombolitic wackestone-packstone. Reef growth was initiated by automicrite-producing biofilms, sponges and a tubular problematic organism. Primary relief building was accomplished by automicrite-dominated frameworks and lithistid sponges, crinoids, and corals. Large cerioid Aphrophyllum coral colonies had a heterogeneous distribution through the reef. The framework of the main relief-bearing portion of the reef consists on average of 44.4 % automicrite and automicrite-bound detritus, excluding automicrite-bound sponge body fossils, and at most 19.6 % skeletal organisms in growth position (minimum of 7.2 %). If sponge body fossils are included as automicrite framework, because they are preserved only as a result of automicrite formation, the percentage of automicrite and bound sediment is 54.9 %. A smaller sampled reef consisting of the same basic facies had 39.5 % automicrite and automicrite-bound sediment in its framework (50.2 % including sponges) and, at most, 33.4 % skeletal organisms in growth position (minimum of 22.7 %). The greater volume of skeletal framework in the small reef reflects a greater proportion of large corals. Of frame-building skeletal organisms, automicrite-preserved lithistid and other sponges and cerioid rugose corals provided the greatest volume. However, crinoid holdfasts were the most widespread skeletal framework components. The dominant framework facies are sponge-automicrite boundstone, encrusted thrombolite boundstone, mixed automicrite boundstone, and coral boundstone. The reefs are similar in overall framework construction and ecological succession to slightly older Visean reefs in eastern Australia and to some of the late Visean reefs of northern England. Surprisingly, framework similarities also exist between the reefs and certain thrombolite-lithistid-coral reefs of the European Jurassic.
