Browsing by Subject "winged shell"

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    • Outline of the Geologic History of the Grand Traverse Region 

      Martin, Helen M. (Michigan Department of Conservation, 1957-04)
      The four counties bordering Grand Traverse Bay with Kalkaska and Benzie counties form a unit sharing the same geologic history. The foundation of the region is a segment of the western rim of the nest of rock bowls that ...