Petroleum occurs in the Comanche section of middle Albian (Trinity) age in the Bend area of southern Florida, commercial amounts of oil are found in a 430-ft. cyclothem which contains bituminous limestones, porous dolomites, coquinal limestones, dense limestones, white anhydrites, and calcareous shale. These varied and thin-bedded rocks are associated with the Sunniland pay zone at depths near 11,000 ft. In this cyclic sequence petroliferous limestones are found near reservoir limestones and both are confined by dense anhydrite, shale, or limestone. In the Bend area depositional structures plunge very gently NW. and are tilted NE. which is the reverse of regional dip.