【描述】图为腾冲“柱状节理”，总面积达2平方公里，大约形成于4万年前，对研究火山岩浆生成和地质构造有重要科学价值。
        
         The picture shows “columnar jointing” with an total area of 2 km² which was formed about 40,000 years ago. It is extremely valuable for the study on volcanic lava formation and geologic structure.