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Browsing by Subject "diabase"

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    Bulletin No. 2. Preliminary Description of the Peridotytes, Gabbros, Diabases and Andesytes of Minnesota
    (Minnesota Geological Survey, 1887) Wadsworth, M.E.
    It is proposed in the following pages to give a preliminary description of certain types of Minnesota rocks, to serve as a framework for a more complete discussion of the same in the final report. The field relations and to some extent the microscopic characters of the rocks described in the following pages have been given by the state geologist in the annual reports for 1879, 1880, and 1881, and in volume I of the final report. In some cases it will be found that the field relations have led the state geologist to different conclusions concerning the nature of the rocks in question from those adopted by the writer, who has based his views upon the correlation of the microscopic characters of rocks and their field relations, as studied by him elsewhere.