Debate unfolds over origin of grouped stones at lake's bottom

Forty feet below the surface of Lake Michigan in Grand Traverse Bay, a mysterious pattern of stones can be seen rising from an otherwise sandy half-mile of lake floor.

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<p><a href="http://www.physorg.com/news153932267.html">Debate unfolds over origin of grouped stones at lake's bottom</a></p> <p>Forty feet below the surface of Lake Michigan in Grand Traverse Bay, a mysterious pattern of stones can be seen rising from an otherwise sandy half-mile of lake floor.</p>