Vertebrate fossils of Yunnan are only previously known by a few tragmentaryfinds belonging to early Tertiary and Plio-Pleistocene age. In October 1938, Mr. M.N. Bien of the Geological Survey of China discovered a rich fossiliferous formationwith two levels of vertebrate remains. Most of the well-preserved fossils were derivedfrom the lower level and contain remains of Dinosaurs which are still under the