Two-ship synthetic aperture data from Mesozoic oceanic crust in the western North Atlantic contain wide-angle reflections and refractions from oceanic layer 2 at the longer offsets (6--9 km). With appropriate velocity filtering to remove cross-cutting reflections from the sediment column, the wide-angle data may be stacked to produce images of the upper oceanic crust. Some dipping events are imaged both near normal incidence and at wide-angle, and are most likely due to zones of anomalously high impedance. Such zones may be generated by hydrothermal alteration of material in fault zones generated near the spreading center. ¿ American Geophysical Union 1993