Abstract
Typical aeromagnetic total intensity profiles are compared with ground‐magnetic vertical intensity profiles over the same geologic structures in the Iron River district in the northern peninsula of Michigan. The magnetic surveys and the pertinent geologic conditions causing the anomalies are briefly discussed. Certain slate and volcanic rocks of Pre‐Cambrian age produce the major anomalies; in addition, inversely magnetized diabase dikes cause pronounced negative anomalies. The aeromagnetic profiles are strikingly smoother than the ground‐magnetic profiles chiefly because of the merging and attenuation of anomalies with increasing height. The commonly used depth rules applied to the aeromagentic data yield depth estimates that are usually too great.
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