Well developed coral-stromatoporoid biostromes (probably reefs). 25 m thick.
Autogenic succession with first branched then massive corals and finally abundant stromatoporoids.
Actinostroma, Stictostroma, Clathrocoilona, Dendrostroma, Hermatoporella and Stachyodes present. 
Rugose corals: Hexagonaria, Peneckialla, Disphyllum, Temnophyllum