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University of Minnesota geologist eyeballs 1 million feet of rock

Published 03/26/2010, Duluth News Tribune

On March 11, about 10 miles west of Hoyt Lakes, Minn. Mark Severson eyeballed his one-millionth foot of core sample rock, all the while keeping track of the trace elements of minerals he saw and noting where the samples came from. That’s 190 miles of 2-inch-diameter cylinders of rock that would stretch from Duluth to Faribault.

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