The finding of oil is the common objective. Cooperation between specialists is recognized in principle as a necessary condition for realizing the optimum ill effective exploration. The Cement Field in Oklahoma is an example of geological and geophysical cooperation. It was discovered in 1916 but a seismic survey was initiated in 1941 to develop new production. The correlation of well information gave a wealth of geologic data. Thus as the seismic work progressed a joint effort developed among the geologists and geophysicists. Excellent agreement was reached, after much discussion, between geologic and geophysical contours. The geologists reexamined their basic information with the apparently contradicting geophysical evidence while the geophysical data were reexamined with the guidance of the geological evidence. The imaginative phase of exploration was introduced by interpolations between control horizons. The gas-bearing Medrano sand was indicated as having oil possibilities down dip and at least 3000 ft of added section was indicated. Drilling confirmed these postulates.