Petroglyphs are a subset of the general category of rock art or rock graphics, which also includes pictographs and geoglyphs. Petroglyphs (petrōrock, glyph-carving) are man-made images or a series of geometric patterns that are carved, pecked, chipped, or abraded into stone ...

  • Loading...
locked icon

Sign in to access this content

Get a 30 day FREE TRIAL

  • Watch videos from a variety of sources bringing classroom topics to life
  • Read modern, diverse business cases
  • Explore hundreds of books and reference titles