Total magnetic intensity anomaly, contour, scale 1:100,000.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. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn21111.pdf
Total magnetic intensity anomaly (relative to the earth's magnetic field), color coded, scale 1:250,000. Interpretation of magnetic data collected from airborne surveys, the map colors indicate the distribution and concentration of magnetic minerals (primarily iron-bearing) within the upper crust of the earth. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn21104.pdf
Jirsa, Mark A.; Chandler, Val W.; Runkel, Anthony C.
Date Created:
1999
Description:
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of northwestern Minnesota, scale 1:200,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn22489.pdf
Jirsa, Mark A.; Runkel, Anthony C.; Chandler, Val W.
Date Created:
1994
Description:
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of northwestern Minnesota, scale 1:250,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn22477.pdf
Ojakangas, Richard W.; Mossler, John H.; Morey, G.B.
Date Created:
1979
Description:
Map showing interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Roseau quadrangle, scale 1:250,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn22373.pdf
Jirsa, Mark A.; Runkel, A.C.; Chandler, V.W.; Boerboom, T.J.
Date Created:
1993
Description:
Explanation and maps of the bedrock geology of northwestern Minnesota. Contains drillhole data and results from chemical analysis of drill core samples. Four plates included. Geologic map superseded by Minnesota Geological Survey publications M-80, M-92.
Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between an observed gravity measurement and value predicted from a generalized earth model), shown as contour lines (isolines) of equal value, Roseau quadrangle, scale 1:250,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn22391.pdf
Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23265.pdf