A high-resolution hydrographic transect across the shelfbreak south of Nantucket Shoals in August, 1995, revealed an unusual surface-trapped intrusion of saline Slope water onto the continental shelf. The intrusion was confined to the upper 25 m of the water column and penetrated 15 km shoreward of the 100-m isobath, the typical position of the shelfbreak front. The maximum salinity within the intrusion was 35.0. Several strong jets were present within the surface layer with maximum velocities between 0.30 and 0.44 m s-1 in the alongshelf direction. Satellite thermal imagery confirms the presence of a warm-core ring at the offshore edge of the section and shows a warm feature penetrating shoreward of the 100-m isobath. ¿ American Geophysical Union 1996