Discovery of the North Snyder reef in November, 1948 by the Standard of Texas focused the attention of the oil industry on this part of West Texas and presented the geophysicist with the problem of how to locate other reefs of this type.The North Snyder reef is unique in that reflected energy is obtained from the reef-shale contact in some parts of the field. Magnetic, gravimetric and seismic data are presented to show some of the effects to be expected from a reef of this type.A number of electric logs it appears that the 'draping' effect is small above the thick Pennsylvanian shale section which compensates for the reef mass. Contour maps for the base of the Coleman Junction limestone and the top of the Canyon reef are presented.

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