Gas field, top of reef in 3000 m depth. 
15-17 % avg. porosity.
More than 850 m thick (including the Sakmarian to lower Artinskian).
Tubiphytes and bryozoans as main reef builders.
Additionally stromatolites, encrusting algae, hydrozoans(?), corals and fusulinids.
Asymmetric with N slope dipping 3-5°, S slope dipping 25-35°.
