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Sections in strongly to moderately curved foreland fold-thrust belts may be restorable, but retrodeformation of two-dimensional (2D) serial sections produces overlap of their hinterland ends, making the incompatibility problem obvious. Outward-radiating displacement vectors predict along-strike stretching that increases toward the outer portions of arcuate foreland fold-thrust belts. Balancing of curved foreland fold-thrust belts becomes a three-dimensional (3D) material balance problem, involving non-plane strain. We propose a technique that will solve the 3D balancing problem if: (1) boundary pin lines, consisting of strike-boundary and normal-boundary lines, are present and identifiable; (2) a set of constant-length lines can be defined; (3)...

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