The stone outcrop at the Hagood Mill Historical site contains prehistoric rock art as well as a few not-so rare messages likely carved in the 19th or 20th centuries. Archaeologist Tommy Charles distinguishes petroglyphs from more recent rock scrawling by examining the technique of the artist. Prehistoric humans used a hard stone tool to peck and pick away at the face of a soft stone surface. Scratching across the surface of the rock created modern scrawl and English text. As seen in the following video, time continues to weather the petroglyphs, adding the difficulty of locating rock art.