Petroglyph National Monument, on the West Mesa escarpment of Albuquerque, New Mexico, contains more than 15,000 historic and prehistoric stone carvings (petroglyphs) that are both Native American ( Anasazi) and Hispanic in origin. The carvings are etched along 27 km (17 mi) of black volcanic rock that winds along the escarpment. The deep carvings have a glossy appearance from weathering in the desert climate. Although it is believed that most of the etchings date from the period a.d. 1300–1650, more than 100 nearby archaeological sites contain remains that reflect human existence in the area over the last 12,000 years. The monument, established in 1990 and covering an area of 2,100 ha (5,188 acres), is a sacred place to the Pueblo people.