Abstract 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.

Abstract This paper presents eighteen geophysical maps covering nine salt domes and deep-seated structures of the Texas and Louisiana Gulf Coast. Two shallow domes, namely, Moss Bluff and Fannett, are given. Fannett is a gravity maximum, and Moss Bluff is a combination of a gravity minimum and maximum. The Sugarland dome is given as an example of a medium-depth structure, which is indicated by the torsion balance as a minimum. Six deep-seated structures are shown, including Sheppards Mott, Pledger, Mykawa, Tombali, Livingston, and English Bayou-Gillis. The deeper-seated structures invariably show a gravity-minimum influence. A refraction seismograph map of Moss Bluff is given, and reflection-seismograph maps are given for Sheppards Mott, Tombali, and English Bayou-Gillis. A magnetic map of the Fannett field is likewise presented.