The Menhir Stone in Minnesota

Standing over 60 feet tall in the Northern Minnesota wilderness, roughly a mile from the Canadian border is a mysterious standing stone defies explanation. Was the over 100-ton slab of hematite-rich iron formation erected by man in the distant past, or was the work of nature through some unknown geological process over 10,000 years ago? When first approaching the huge monolith, it looks like it had to be the work of humans to get the flat, tabular slab erected to its nearly perfect vertically aligned position. However, upon closer inspection there is evidence in the surrounding area that provides clues as to its origin.