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When a competent layer undergoes boudinage, the response depends upon the viscosity contrast between this layer and the surrounding matrix. Normally the strain rates are high at the boudin margins than the boudin centers and the outer part of the boudin flows in a ductile manner than the central, filling the gap between two adjacent boudins. As shown in the figure, this gives rise to boudins whose ends look like mouth of fish and hence the term.