in Wang & Xi, In Zhongguo Kexueyuan Nanjing Dizhi Gushengwu Yanjiusuo [Academia Sinica. Nanjing Institue of Geology and Palaeontology. ] Qianxi diandong wan erdieshi hanmei diceng he gushengwuqun. [Stratigraphy and palaeontolo f Upper Permian coal-bearing
