Low-flying helicopters to survey geology across 16 Michigan counties

Low-flying helicopters will soon take to the skies over 16 counties in southwest Michigan to map the region’s geology.
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Why you’ll see helicopters with giant hoops flying over Michigan this spring

Residents in Southwest Michigan may soon see low-flying helicopters carrying strange-looking equipment. The choppers were scheduled to begin conducting surveys of 16 counties as part of a cooperative ...