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8 February 2009
Debate unfolds over Lake Michigan's underwater stones

Forty feet below the surface of Lake Michigan in Grand Traverse Bay (USA), a mysterious pattern of stones can be seen rising from an otherwise sandy half-mile of lake floor. Likely the stones are a natural feature. But the possibility they are not has piqued the interest of archeologists, native tribes and state officials since underwater archeologist Mark Holley found the site in 2007 during a survey of the lake bottom. The site recently has become something of an Internet sensation, thanks to a blogger who noticed an archeological paper on the topic and described the stones as 'underwater Stonehenge.' Though the stones could signal an ancient shoreline or a glacial formation, their striking geometric alignment raises the possibility of human involvement.
     The submerged site was tundra when humans of the hunter-gatherer era roamed it 6,000 to 9,000 years ago. Could the stones have come from a massive fishing weir laid across a long-gone river? Could they mark a ceremonial site? "The first thing I said when I came out of the water was, 'Oh no, I wish we wouldn't have found this,' " said Holley. "This is going to invite so much controversy that this is where we're going to be for the next 20 years." This spring Holley and a student from Northwestern Michigan College hope to make laser scans of the image that will yield a computer model. That will help scientists assess the site, which is otherwise off limits because of American Indian concerns that the area could be sacred.
     Researchers who study early American Indians say they will need more evidence to be convinced the stones are a human artifact. They are especially wary of the idea of a mastodon petroglyph. Mastodons were facing extinction when early humans were on the scene, and the few that still existed in North America lived much farther south, evidence shows. "It would be the only visual representation of such in the whole hemisphere," said a skeptical Charles Cleland, retired curator of Great Lakes archeology and ethnology at Michigan State University. Still, Hank Bailey of the Grand Traverse Band of Ottawa and Chippewa Indians said, "There's a lot that we haven't learned." Moreover, to American Indian eyes, the rocks seem to be arranged with some purpose, he said. "It could easily be a ceremonial site," said Bailey, who gave underwater photographs of the stones to religious leaders.
     Evidence shows human families were present in northern Michigan thousands of years ago. They traversed a barren tundra dotted by stands of fir trees in pursuit of elk and woodland caribou, gathering nuts and berries as they passed. People did not linger in such a cold, marginal land, but they did mine chert for spear points from a site near Charlevoix and left evidence of campsites in the area, Cleland said. Humans of that time frequently arranged stones to dam streams - to trap fish and for other reasons, said Northwestern University archeologist James Brown. "Until they're investigated archeologically, it's hard to tell," Brown said of the submerged formation.
     To satisfy Grand Traverse Bay's American Indian community, which wants to minimize the number of visitors to the site, and to preserve his prerogative to research the spot, Holley has kept its exact location a secret. He said he hopes a computer model of the gouges in the mastodon rock will help experts tell whether the features were a trick of chance cut by glacial forces or were the work of ancient humans. Cleland said petroglyphs are rare in the Upper Midwest and stone circles are more common among primitive farmers than among the hunter-gatherers who traveled through Michigan. "But I think this is certainly something that needs to be investigated," Cleland said. "It would be unthinkable to leave it alone and not try to figure it out."

Source: Chicago Tribune (8 February 2009)

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