About six years ago, I had a tour of Track Rock Gap in Georgia. On the east slope of the Gap, opposite where the petroglyphs are (from which the Gap got its name) are a number of terrace walls and cairns, and on top of one wall, partially obscured by briars and brush, I found a stone “foot,” fashioned or weathered from a pink colored stone. Carey Waldrip, who showed me the site, had not noticed this before. I was reminded of this when I saw your blog and the curiously shaped anvil stone that was just posted. Certainly the Indians were intrigued by such oddly shaped stones, and probably set them in various places for others to see and venerate.