Magnetic data on the structure of the central Arctic region

On the North American side of the underwater Lomonosov Ridge, a zone of closely spaced, high-amplitude magnetic anomalies, similar to typical profiles over the Precambrian rocks of the Canadian shield, includes nearly half of the Canadian Basin and probably all of the Central Arctic Basin. On the other side of the Ridge in the Eurasian Basin, the magnetic profiles resemble typical oceanic magnetic profiles and are relatively smooth or show only minor anomalies, making it doubtful that the Mid-Atlantic Ridge extends through this part of the Arctic. The Arctic region consists of an oceanic area on the Eurasian side and a downdropped continental Precambrian complex on the North American side. Magnetic maps and profiles are included.