Zeta Lake Member
Pinnacle reef
Lower and upper reef zone:
Upper: 
Top 
- Carbonate sands
- Solenopora algal crest
- Robust stromatoporoids, rugose corals, Renalcis

Lower
- Algal-laminated crustose (Renalcis, Rothpletzella, ?Wetheredella)
- Rugose corals, laminated stromatoporoids.

110 m thick. 1.6 km diameter.
8 % avg. porosity