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The South Florida basin is part of the larger Florida-Bahama platform province, a slowly subsiding area.
The basin contains several regional positive and negative structural features. Basement consists predominantly of extrusive igneous rocks.
In the deeper part of the basin, Coahuilan carbonates and probably Jurassic rocks overlie the basement. Tertiary, Gulfian, and Comanchean strata have been penetrated by numerous deep wells. Comanchean rocks are cyclic in nature and consist of limestone, dolomite, and anhydrite.
Three units are favorable for oil production: the "brown dolomite," the Sunniland Limestone, and Unit C of the Dollar Bay Formation. Gulfian chalk is replaced by dolomite in southeast Florida where it has a low oil potential. The lower Tertiary Cedar Keys Formation, composed of dolomite and anhydrite, also has oil potential. Eocene interbedded limestone and dolomite have little potential because they are flushed by fresh water of the Floridan artesian aquifer. The upper Tertiary is thin and has no favorable characteristics or oil production.
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