ABSTRACT The Sunniland Limestone (Lower Cretaceous), consisting of carbonate rick and anhydrite, has the distinction of producing the only oil and gas in southern Florida. Raccoon Point Field, Collier County, Florida, is one of thirteen fields discovered along the Sunniland trend, producing from paleotopographic highs associated with patch reefs and high-energy bioclastic deposits. Deposition of the Sunniland Limestone occurred in three transgressive-regressive sediment packages or sequences (Lower, Middle, and Upper Sunniland), each is related to regional or eustatic sea-level changes. Each sequence is further divided into successive shallowing-upward intervals or parasequences. The end of each sequence is marked by a basinward shift in coastal onlap, representing a major fall in relative sea-level. The end of the Middle Sunniland is marked by a prolonged fall in relative sea-level. During this lowstand, a restricted basin developed within the Florida Embayment where a thick subtidal anhydrite was deposited. The lowered sea-level at the end of the Middle Sunniland and the dominance of intertidal-flat and supratidal-sabkha environments in the Upper Sunniland are interpreted to have significantly influenced reservoir development at Raccoon Point Field through porosity and permeability enhancement of bioclastic deposits by leaching and dolomitization. The dolomite reservoirs at Raccoon Point Field occur at the top of the Middle Sunniland and within the Upper Sunniland. They are interpreted as high-energy deposits formed from bioclastic debris shed behind rudist mounds. Reservoir development in the Middle Sunniland is most likely because of diagenesis associated with restrictive hypersaline conditions under which an evaporite wedge was deposited when sea level fell at the end of Middle Sunniland deposition. Creation of the Upper Sunniland dolomitized bioclastic reservoir was probably influenced by restricted conditions associated with intertidal-flat and supratidal-sabkha environments. Anhydrite and dolomitized carbonate rock from these environments dominate the Upper Sunniland and therefore form a low porosity and permeability reservoir-seal.