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In a surprisingly under-reported story from 2007, Mark Holley, a professor of underwater archaeology at Northwestern Michigan University, discovered a series of stones ? some of them arranged in a circle and one of which seemed to show carvings of a mastodon ? 40-feet beneath the surface waters of Lake Michigan.
If verified, the carvings could be roughly 10,000 years old ? coincident with the post-Ice Age presence of both humans and mastodons in the upper midwest.

neat

http://bldgblog.blogspot.com/2009/01/stonehenge-beneath-waters-of-lake.html
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