A seismic map prepared by Western Geophysical Company for General Petroleum Corporation, preceding the discovery of the Helm oil field in Fresno County, California, by the Amerada Oil Company in October, 1941, is compared with a recent structure map based on the results of drilling, and good agreement is seen.

Structure and stratigraphy now known from drilling are compared with reflection-seismograph cross sections obtained by the General Petroleum Corporation and conclusions are drawn about the optimum seismic field and interpretative techniques in this type of area.

The local results of a gravity-meter survey by the Brown Geophysical Company for the Seaboard Oil Company are shown and interpreted, though neither the Amerada nor the General Petroleum Company used gravity results as a guide in seismic programs.

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