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The difference between the normal and reverse kink bands is shown in figure accompanying this text. If the compressive stress acts parallel to the layering, conjugate kink-bands or box folds are produced but if it acts at an angle to the layering, a single set of kink-bands are developed more or less at the exclusion of the other. Patterson and Weiss (1966) produced conjugate and single kink-bands experimentally and one of their significant conclusions has been that under large shortening, kink-bands are converted into chevron folds. Dewey (1966) made significant contribution towards our understanding of the nature and origin of kink-bards and Arvid Johnson and his coworkers have presented through a series of papers (see 1976 numbers of Tectonophysics) the origin of kink-bands by extensive theoretical treatment of the problem of their origin and geometry.