Abstract
Some peculiar ‘bone-shaped’ boudins are observed in two areas of progressive shearing. They are characterized by large quartz-filled gashes that separate thinner boudins. These gashes often have a consistent obliquity, suggesting a rotation synthetic to the shear sense. These may be formed by rigid material that crystallizes in tension gashes between the boudins; during further ongoing deformation these behaved as rigid inclusions in a more ductile matrix and show systematic rotations. The sense of rotation of the gashes constitutes a shear criterion.
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