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	Maryland Petroglyphs (rock carvings) PETROGLYPHS are prehistoric depictions carved in rock. The designs were pecked or carved into relatively soft rock, and possibly “finished” by polishing the cut grooves with sand Add to Reading List Document Date: 2015-06-15 14:36:01 Open Document File Size: 712,61 KB Share Result on Facebook

Maryland Petroglyphs (rock carvings) PETROGLYPHS are prehistoric depictions carved in rock. The designs were pecked or carved into relatively soft rock, and possibly “finished” by polishing the cut grooves with sand Add to Reading List