AbstractThe results of an 805‐mile (1300 km) airborne magnetometer profile flown across Tunisia and Algeria, from Tunis to the coast west of Oran, across north‐western Spanish Morocco and Tangier, and across south central Portugal to Lisbon are presented. The general geology of the zone over which the profile was flown is shown with the magnetic variations. Depth, structural and rock type interpretations have been made from the magnetic control. The depth values are believed to be high due to angle of the flight line with respect to the probable maximum gradient of the magnetic anomalies. However, depth values are given in all of the basins of possible inter