Chengjiang
They contain an exquisite degree of detail, cover a diverse range of fauna, and are significant in attempts to understand the evolution of life on Earth.The fossils were first discovered by Henri Mansuy and Jaques Deprat who described them in 1912, the year after Charles Walcott's initial publications on the Burgess Shale.It was not until 1984 that the true significance of the palaeontology of the region was realised by Hou Xian-guang, a professor at Yunnan University, Kunming, where he is director of the Research Center for Chengjiang Biota.They have been exploited in part through efforts that began at about the same time that Hou Xian-guang discovered the deposits that bear these exceptional fossils, with phosphate mining bringing in some 2/3 of the city's revenue in 2003.Chengjiang faces a dilemma between calls for preservation of the treasure trove of early Cambrian fossils, the economic reliance it has on the phosphate industry, and the difficulty of finding a balance between exploitation and restoration of the land while this is still possible.