On August 3, 2003, a 110000-year-old human tooth fossil about 3 cm in length was unearthed in Zhangkoudong Ancient Human site in Jiuxiang, Yiliang County As soon as the excavation was announced, it immediately attracted wide attention from the media and experts
Many experts involved in the excavation believe that the appearance of this human tooth fossil shows that Zhangkoudong already had human activities as early as 110000 years ago, and it will rewrite the conclusion that human beings in Kunming area, as defined by the Longtan Mountain Ancient Human site in Chenggong County, have a history of only 30,000 years
Some experts have analyzed the long axis of the tooth, the shape of the crown, the protrusion of the lip and tongue of the crown and the enamel of the fossil, and think that the fossil is not a fossil of human incisor, but a fossil of deer tooth.