Area-balanced theoretical models that relate the footwall cutoff angle (theta) to the fold interlimb half-angles (gamma* and gamma) show that open folds (high gamma* and gamma) are characterized by relative thickening of stratigraphically higher units, whereas tight folds (low gamma* and gamma) are characterized by relative thinning of these units.

The propagation of thrusts is commonly characterized by the progressive tightening of the fold hinge and steepening of the front limb. Thickening of stratigraphically higher units in the early stages of folding i followed by localized thinning of the front limb in the late stages.

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