A new bathymetric map, based on Sea Beam data, was compiled for the continental margin south of Galicia Bank, in the area of Ocean Drilling Program (ODP) Leg 103 drilling. Using a new series of 12 single-channel seismic profiles oriented perpendicularly to the continental margin and multichannel seismic profiles previously acquired in the area, we constructed a detailed map of the surface of the tilted fault blocks and half grabens formed during the Early Cretaceous phases of rifting. Tilted fault blocks 13-18 km apart and oriented roughly north-south, are continuous over distances of as great as 60 km. We divided the upper and lower parts of the margin on the basis of magnetic data, distance be tween tilted fault blocks, nature of sediments involved in the rifting processes (pre-and syn-rift or only syn-rift sedi ments). This report also discusses the significance of the S reflector located below the tilted fault blocks.
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