This paper presents data from a combined refraction and reflection profile from which vertical velocities are calculated. The accuracy of velocities so obtained is brought out by checking them with velocities obtained from shooting a well drilled two years after the seismograph work. It is also interesting to note that this method offers a means of identifying reflection horizons with refracting horizons, permitting better correlation between geologic and seismic markers. The method is of particular value in areas where little exploration has been done.

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