Cloos' (ibid., v. 52, p. 420-444, 1968) paper on the concept of down-basin gravitational sliding of sedimentary prisms to explain the pattern of Gulf Coast faults may offer a possible solution to theproblem of 'tectonic denudation' (de Sitter, 1964, p. 239). In areas where the mechanism of gravitational sliding may have been operative, belts of superficial foreland folding and thrust faulting may have developed. On associated uplifts, areas of tensional spreading along many gravity faults may have occurred rather than denudation. Extension on the uplift would match shortening by thrust faulting and folding in the foreland areas.

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