Is there a mini Stonehenge under the waters of Lake Michigan?
In a surprisingly under-reported story from 2007, Mark Holley, a professor of underwater archaeology at Northwestern Michigan University College, 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 as much as 10,000 years old -- coincident with the post-Ice Age presence of both humans and mastodons in the upper midwest.