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NONPERIODIC FOLDS

When two fold trains, each propagating along the layering at its own rate, having initiated at varying perturbations or deflections, then, the two are likely to interfere and produce at such a place folds of anomalous span, periodicity. Such structures can occupy substantial areas and are called nonperiodic folds. Such folds can also originate by a process other than buckling, such as bending.