Aeromagnetic map of Minnesota, central region, Plate 2
Description
Total magnetic intensity anomaly, contour, scale 1:250,000. Interpretation of magnetic data collected from airborne surveys, the map contours (lines of equal magnetic intensity) indicate the distribution and concentration of magnetic minerals (primarily iron-bearing) within the upper crust of the earth.
Chandler, Val W. (1985). Aeromagnetic map of Minnesota, central region, Plate 2. Minnesota Geological Survey. https://reflections.mndigital.org/catalog/mgs:599 (map)