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A study of the possibility of prediction of the overhang at Barbers Hill was based on quantitative calculations from a diametral torsion-balance profile across the dome and the drilling data in regard to the top of the cap and salt. A series of three alternative positions of the flank of the salt on the left and four on the right were assumed. All combinations of the assumed left and right alternative positions of the edge of the salt were tested. Several variations of the assumed density relations were tested. Several variations of the regional gradient were tested. The gradient profiles which would be produced by the respective assumed forms of the dome were calculated by the writer's graphical method. For the calculated gradient profiles which had the closer fit to the observed gradient profile, the mean-square difference between the calculated and observed profiles was used as the test of the relative closeness of fit. The form of the dome which had considerable overhang on the right and slight overhang on the left consistently had the least mean square. The conclusion therefore is that the overhang at Barbers Hill could be predicted in advance of drilling solely on the basis of torsion-balance data and of whatever data in regard to the cap and salt might be available from drilling.
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