Geophysical surveys in the past have been successful in the location of anticlines and faults, large either in relief or in area, and in a general way known oil provinces in the United States have been covered by this kind of survey, and particularly using the reflection seismograph. But the finding of these large structures might be considered "high grading." A substantial part of recent discoveries by the reflection seismograph has been different because on structures of low relief or of small area.

The discussion emphasizes that this kind of an exploration program requires that reflection shooting to be successful must be refined and improved, particularly in the contouring and geological interpretation.

End_of_Article - Last_Page 2379------------