Various geophysical methods are discussed in relation to their possible value in locating limestone reefs, with special emphasis on the gravity meter and seismograph. The effects of possible velocity variations through reefs on reflections from below a reef body are examined. Relationships between the shallow and deep horizons indicate that time isopach maps of such seismic data are extremely valuable. A suggested exploration procedure describes several detailing methods, and emphasizes the important role of the interpreter in solving the problems associated with exploration for limestone reefs.

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