Abstract
Despite some uncertainty concerning its use as an indicator of strain orientation in folded rocks, slaty-cleavage is generally regarded as a penetrative tectonic fabric that is related to the symmetry of inhomogeneous, finite strain within a fold system. On the basis of this concept, a quantitative method is developed for establishing the distribution of finite strain on the profiles of symmetric cylindrical folds using the relative orientations of cleavage and bedding traces on the plane of section. The method also provides a technique for critical examination of the widely-accepted hypothesis that slaty-cleavage is formed perpendicular to the directions of maximum shortening in folded strata. The analytical procedures are demonstrated and tested by application to a model of an ideal flattened concentric fold.
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