SEAFARER Site Survey, Upper Michigan Region. Book 11. Surficial Geologic Data.
GTE SYLVANIA INC NEEDHAM HEIGHTS MASS COMMUNICATIONS SYSTEMS DIV
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In the study area region, near surface materials are primarily separated debris left by the melting of Wisconsin Age glaciers. Because of deposition by glacial ice most of these materials are poorly sorted, ranging in size from clay to boulders. The surficial deposits mantle ranges from a few tens to hundreds of feet in thickness with local outcrops of hard unweathered rock protruding through the cover. Available geologic data have been summarized on a map which provides information on the location of bedrock outcrops and the areal extent of surficial deposits. Author
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