Alxa's wonderful stones are mainly distributed in the north Gobi area of Left Banner, and were formed by magmatic sedimentation and a series of geological events about 80 to 100 million years ago. After a long time weathering, the weaker parts have been eroded, and the residual are the toughest silica which forms the surprising and gorgeous wonder stones. The most famous wonder stones are "The Chick Breaking Out of the Egg", and "The Years".