Stones in a circular formation along with possible ancient carvings have been discovered deep below the surface of Lake Michigan (USA). According to BLDGBLOG, in 2007, Mark Holley, professor of underwater archeology at Northwestern Michigan College, discovered a series of stones arranged in a circle 40 feet below the surface of Lake Michigan. One stone outside the circle seems to have carvings that resemble a mastodon—an elephant-like animal that went extinct about 10,000 years ago.
     Archaeologists had been hired to survey the Lake's floor near Traverse City, Michigan, and examine old boat wrecks with a sonar device. They discovered sunken boats and cars and even a Civil War-era pier. But among these expected finds was a potentially-prehistoric surprise. "When you see it in the water, you're tempted to say this is absolutely real," Holley told reporters at the time. "But that's what we need the experts to come in and verify."
     Specialists involved in the case are skeptical and want to gather more info before making a judgment. The problem? "They want to actually see it," said Holley. "Experts in petroglyphs generally don't dive, so we're running into a bit of a stumbling block there." The formation, if authenticated, wouldn't be completely out of place. Stone circles and other petroglyph sites are located in the area.

Source: NBC CHicago News (8 January 2009)