The results of the reprocessing and prestack depth migration analyses of a reflection seismic profile across the Iberia Abyssal Plain margin show deep reflections within the basement, which are associated with block faulting. The overlying sediments, deposited during different phases of rifting, are discernible by their interval velocities. Combined with the present knowledge of the mechanism of lithospheric extension in the area of the Galicia Bank, this profile supports the idea that the Iberia Abyssal Plain continental extension leading to breakup may also have been controlled by detachment fault systems active during different phases of rifting. As a consequence of exhumation during repeated extension, a crustal cross-section is exposed, where one can identify upper crust, lower crust, and finally mantle material from east to west along this transect across the ocean/continent transition.