Inozoid, Sphinctozoid and sclerospongid sponges as main reef builders. 
Corals abundant, bored. Spongiostromata crusts locally abundant.
Strong internal zonation.
Hexactinellid sponges also present. 
30 m thick patch reefs, up to 50 m in diameter, seperated by bedded sandy limestones and calcareous sandstone.
Shales at base and ?surrounding.
Marls with Heterastridium lobatum at the very base. Heterastridians also within reef.
Was Norian/Rhaetian, now exclusively late Norian (Flügel, 2002 and PBDB)