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Rock formation in southern Arizona in Chiricahua National Monument (south of Willcox); the Chiricahua Apaches called such rock formations Standing-Up Rocks. This picture shows one of several balanced rocks along the Big Balanced Rock Trail. The rocks are made up of compressed volcanic ash. Softer layers are washed away which accounts for these bizarre formations. More photos of this area: 37408534 37397557 37370845 37370603 37366259 37280986