Abstract
The Church Bay Anticline is one of a series of E-W trending Hercyman folds in southern Ireland. The fold has a crudely axial planar cleavage which was initiated early in the buckling history. The cleavage was deformed subsequently by a number of discrete bedding parallel shear zones as the fold continued to amplify. This has resulted in a characteristically sigmoidal cleavage geometry in the fold profile plane. The cleavage also displays kink bands and sharp angular changes across bedding planes in the fold hinge as a result of shearing. Within these sheared zones the cleavage is intensified indicating that conditions for cleavage formation were maintained throughout the development of the fold. No new cleavage has formed despite the rotation of the cleavage during the deformation history.
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