In 1980 the Minnesota Geological Survey (MGS) began a program of scientific test drilling for the purpose of acquiring a better understanding of the complex Precambrian bedrock of central Minnesota. The areas investigated in this project contain very few bedrock outcrops; the Precambrian rocks are thickly covered by unconsolidated surficial deposits of Quaternary age, and the only way they can be directly sampled and studied is by core drilling. This circular is an essentially uninterpreted summary of basic lithologic and chemical data derived from the scientific core drilling project.
Southwick, D.L.; Meyer, Gary N.; Mills, Sarah J..
Information Circular 23. Scientific Core Drilling in Central Minnesota: Summary of Lithologic and Geochemical Results.
Minnesota Geological Survey.
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