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Research about Minnesota

Source-linked reports with geographic coverage including Minnesota.

971 records · Page 54Linked to original sources
USGS1952

Progress report on geologic study of the Crosby and Ironton area of the Cuyuna Range, Crow Wing County, Minnesota

The detailed geology of part of the Guyana manganiferous iron-ore district was mapped during the summer and autumn of 1951. The only exposures of bedrock in or near this area are in the open-pit and underground mines where two or more layers of iron-formation and associated elastic sediments have been deformed into a complex fold system and have been intruded by large dikes. The accompanying maps and sections show the distribution of the several rock types exposed, brief descriptions of these materials, and data on the geologic structure. For the most part this structural and lithologic information has been generalized from much more detailed maps prepared in the field on scales of 30, 40, or 50 feet equal to one inch.

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USGS1951

Preliminary report on ground-water conditions in the Cloquet area, Carlton County, Minnesota

A study of the geology and ground-water conditions in the.area including Cloquet, Minn., was begun by the United States Geological Survey in 1948 in financial cooperation with the Minnesota State Department of Conservation, at the request of the city of Cloquet for assistance in locating large additional ground-water supplies for industrial and municipal use. The location of the area is show on figure 1. Although the present municipal wells provide a fairly adequate supply for current municipal needs, which averaged about three-quarters of a million gallons a day in 1946, there is great need for large supplies of good water, on the order of 10 million gallons a day, for use by the paper mills and other industries there. At present the industries are using water from the St. Louis River, but the water is unsatisfactory and expensive to use because it contains a large amount of objectionable organic material.

Minnesota↗