A circular submarine structure exposed on the seabed in >40 m water depths in the northwestern Gulf of St. Lawrence (Eastern Canada) from the analysis of high-resolution multibeam bathymetric and seismic data. The presence of a circular form characterized by a central uplift and concentric rings resembles the morphology and geometry of complex meteorite impact structures. Patrick Lajeunesse et al. discuss the Corossol structure in their paper on pp. 2542–2558. Seafl oor image produced by Patrick Lajeunesse (Université Laval) from multibeam echosounder data acquired by the Canadian Hydrographic Service.