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• n  a carving or line drawing on rock (especially one made by prehistoric people)

• But the interaction between sunlight and petroglyph could have been accidental.

News & Articles

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• Words at Work by Kathy McIntosh: Musings on Latin may evoke memories, provoke discussion
  A recent trip to Arizona evoked memories of many childhood vacations spent there. We took a short hike to the V-Bar-V Heritage site, the largest known petroglyph site in the Verde Valley. One could speculate that the people who created this rock art used it in part to invoke their gods or spirit guides.
  July 8, 2013 - The Idaho Statesman
• Maine Coast Heritage Trust preserves ancient rock carvings in Machiasport
  Donald Soctomah, historic preservation officer for the Passamaquoddy Tribe, points at an ancient petroglyph marking recently at Long Point in Machiasport. Maine Coast Heritage Trust announced last week that it has acquired the 66-acre property where the petroglyphs are located.
  July 8, 2013 - Bangor Daily News
• Explore Colorado: Family Friendly Hikes
  Jennifer Broome takes us to Boulder Falls, Devil’s Head Fire Lookout and the Ute Petroglyph trails.
  July 8, 2013 - FOX 31 Denver