Upper Minturn Formation phylloid algal-mound (about 7 m thick).
Hydrocarbon staining of fractures.
Phylloid-algal packstone/grainstone.
Fibrous submarine cement.
Ivanovia dominant.
Besides phylloids, Epimastopora is present.
At the base also bryozoans, Girvanella and worm tubes as reef builders.
Cement up to 50 % of buildup.