These Petroglyphs are found on the Utah side of the monument. September 14, 2012 by Matt ThomasThese Petroglyphs are found on the Utah side of the monument. Dinosaur National Monument About Matt Thomas Matt is an avid writer and explorer, who loves to showcase his home state of Colorado. His favorite place to be is right here in the Centennial State. Previous Post:These Petroglyphs are found on the Utah side of the monument.