Collection of Miller 
Shallow subtidal intrashelf.
Reef-mounds with lithistid sponges, receptaculids (Calathium) and microbialite. Girvanella dominant 20-30 % (up to 70 %) of mound volume.
4 sponge species are common. 
4 m thick complex of domal bioherms.
Distinct flanking beds.
Two facies types: 
Bio-lithoclastic wackestone/packstone
Microbial boundstone.
Borings present in cryptomicrobial structures (early lithification).