Abstract: The lower reach of the Danghe River [ = Taben2buluk area of Bohlin (1942) ] is one of the classic areas of late Oligocene in the Asian Paleogene biostratigraphy (Bohlin , 1942 , 1946) . In 1999 and 2001 a joint team of Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences (IVPP) , Institute of Cultural Relics and Archaeology, Gansu, and Provincial Museum of Gansu made a geologic survey of the Danghe area. During the survey some new mammalian fossils of early Oligocene were found. The new find indicates that the Danghe Basin received its Cenozoic deposits from early Oligocene rather than late Oligocene as previously thought. All of the specimens described here are collected from the lower part of the Paoniuquan Formation in the Tiejianggou valley, Aksay Kazak Autonomous County, Gansu Province.