We have both had multiple opportunities as children and adults to view various petroglyphs around the United States and still find them fascinating and mesmerizing. For those less familiar, a petroglyph is a general term for any (human-made) rock carving, typically noteworthy for those from the pre-historic era. Petroglyphs, often referred to as “carvings” outside of the United States, were often made by using a chisel and hammerstone (or similar objects) to carve away the surface of the rock-face, leaving behind the lighter-colored rock underneath, thus illuminating the image.
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