Vol. 1; v. 3, pt. 1-2, printed in Minneapolis. Several plates accompanied by leaf with descriptive letterpress. N.H. Winchell, state geologist. Review of earlier ...
Geologists from the University of Minnesota have found a crater 11 times larger than the iconic Meteor Crater in Arizona. The crater is hidden about 350 feet below the city of Inver Grove Heights, a ...
Federal researchers are heading up two aerial surveys of northern Wisconsin, Minnesota and Michigan to better define the geology of the Upper Midwest. U.S. Geological Survey geophysicist Paul ...
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