On our way from Alamogodo to Carrizozo, we stopped Three Rivers Petroglyph Site. We have read about petroglyphs before, but have never seen them with our own eyes. We saw outstanding examples of prehistoric rock art. Three Rivers area contains over 21,000 petroglyphs including masks, sunbursts, wildlife, hand prints and geometric designs. The number and concentration of drawings here makes it one of the largest and most interesting rock sites in the southwest. Petroglyphs (meaning rock carvings) were made with stone tools by removing the dark patina on the outside of the rocks. The patina forms when oxygen in the air comes in contact with the minerals in the rock’s surface. They are not sure what the drawings mean. They may represent words or thoughts.