Petroglyphs: 400 year old stories!
The Petroglyph National Monument, in Albuquerque, was established in 1990 and we are glad they did! It helps to protect one of the largest petroglyph sites in North America (over 20,000 of them.) We visited two out of the three areas of the monument and these rock carvings, dating back 400-700, were surrounded by houses!
The petroglyphs were "carved" out of a volcanic rock escarpment by ancient pueblo people, by removing the desert varnish, or patina, that had come to cover the boulders after years of heat, rain, and freeze-thaw cycles. The darker the carving, the older it is. (Fun fact: A pictograph is painted on the rock, rather than carved.)
The meaning of symbols is not know, or if known is often not shared due to its sacred nature. It's thought that some symbols serve ceremonial purposes, while others were more practical, signaling trade routes or used to communicate with people traveling from pueblo to pueblo in the Rio Grande Valley.