Gila Bend, Arizona petroglyph manually traced from public domain image at http://en.wikipedia.org/wiki/File:Ancientastronauts.jpg petroglyph tortoise turtle Rock Art Gila Tortoise 1
Gila Bend, Arizona petroglyph manually traced from public domain image at http://en.wikipedia.org/wiki/File:Ancientastronauts.jpg petroglyph tortoise turtle Rock Art Gila Tortoise 2