Abstract

A hand-specimen-size buckle fold from a fault zone in the Appalachian Plateau of New York shows a fanning spaced cleavage attributed to pressure solution because of the truncation of fossils and the presence of residual material in the cleavage laminae. Apparent slip on the cleavage is interpreted to be the result of the removal of material along laminae oblique to bedding. The fold is cut along the cleavage and partially unfolded by rigid-body rotation of the segments, thereby eliminating the offsets of bedding without slip parallel to the cleavage. Field evidence suggests that the material removed from the cleavage laminae is present locally as cement.

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