Francis Farm Petroglyphs

The Francis Farm Petroglyphs are a group of petroglyphs in the southwestern part of the U.S. state of Pennsylvania. Located on a boulder in Jefferson Township in the northwestern portion of Fayette County, it has been known to archaeologists since at least the middle of the nineteenth century. Despite damage in the 1930s, it remains an important archaeological site, and accordingly, it has been designated a historic site.

• http://en.wikipedia.org/wiki/Francis Farm Petroglyphs