The Ten Section oil field, generally regarded as the first geophysical oil field discovery in the San Joaquin Valley of California, was found by Shell Oil Company, Incorporated by means of a reflection seismograph survey made in 1934-1935. The discovery well, Shell Oil Company, Incorporated's K. C. L.-Stevens A-1, was completed in June, 1936. A map presenting results of reflection shooting before discovery and one from well data with contours on the top of the productive Upper Miocene 'Stevens' sand are shown.

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