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The side of a fault that lies below a dipping fault plane; the upthrown side of a normal fault. A footwall slice is a seismic section showing reflections along a curved surface parallel to and displaced 50–100 m away from the fault plane (to get away from distorted data along the fault itself). See Brown (1999, 20–21, 225–232) and Figures F-3 and T-5e.