In 1951 Dan Baldwin, an Oconto youth, was sledding on a hill which was then part of the Charles Werrenbroeck farm. To his amazement he found a leg bone. After considerable investigation it was determined it was the bone of a Copper Culture Indian and the property contained a burial ground of the Copper Culture Indians.  An archeological dig was conducted in 1952.  After the verification it was decided the property should be declared a state park in honor of these first known inhabitants of the area. The property was purchased by the state of Wisconsin and is now the Copper Culture State Park. Burial ground of North America’s earliest metal users, the Oconto Site is the oldest dated cemetery in eastern North America.
Copper Culture Source