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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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A Bouguer gravity map of the southern part of Florida, including stations ranging from about 24° to 26° N lat., and 80° to 83° W long., is presented.
The salient features depicted are: (1) the western rim of the South Florida basin, with gravity values increasing toward the basin's center; (2) a large minimum anomaly centered near Homestead in Dade County; (3) an elongate gravity minimum extending from the area of Barnes Sound southwestward over most of Florida Bay; and (4) a minimum indicated by two gravity readings obtained in the Marquesas Keys, suggesting a need for further investigation.
Examination of cuttings and cores recovered from oil tests drilled on or near the minimum anomalies indicates that if salt is present, it is deep seated (below 11,000 ft). Wells near Homestead show that the area is structurally high at levels ranging from Eocene to Lower Cretaceous. The preponderance of anhydrite, dolomite, and dense aphanitic limestone in more than 4,000 ft of Lower Cretaceous rocks penetrated in the area suggests that the average density of this section may exceed that of the underlying basement. If true, a minimum anomaly would occur over an uplifted or topographically high area of the basement.
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