Many years ago a series of volcanic eruptions began to create Albuquerque's 17-mile long West Mesa escarpment. Lava flowed around the hills and higher ground to create natural canyons along the edge of the escarpment. Today, within Petroglyph National Monument, there are several canyons where petroglyphs are present and also an extinct volcanic area where the park's important geology can be explored. Archeologists believe that Ancestral Puebloans made most of the 20,000 images pecked in stone which can be found inside the park. Rinconada Canyon was the area we chose yesterday in which to explore the petroglyphs. In that canyon it is estimated that there are 1,200 petroglyphs. We walked along a desert path in the canyon which, as you can see in the picture below, has high walls composed of volcanic rock.