Development of the concept of velocity stratification by experimental means has revealed the origin of certain reflection horizons. Correlation of these data with subsurface lithology suggests a method of attack, employing seismic means, on the problem of the stratigraphic trap.This paper outlines the problem and describes a method whereby stratigraphic relationships may be measured. It is suggested that a seismic wave may be fitted to the task by altering its wave length in accordance with the degree of resolution desired. Experimental examples of the procedure are given.

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