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A refraction seismograph method based on the delay-time concept is described. The method is suitable for general application in determining depths to an undulating marker. Special attention is given to the handling of velocity variations on a regional basis. Approximations introduced in the theory to facilitate data handling have proven to yield reliable results for gently dipping (less than 10 degrees) markers. Areal mapping may be accomplished through the use of a network of in-line profiles which may be readily integrated with arc or broadside control.

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