1. Chen Q. 2013. Quantitative study on graptolite biodiversity and palaeogeography in South China during the Ordovician and Silurian transition. Doctoral Dissertation (in Chinese with English summary). Nanjing: Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences. 1–211
2. Chen X, Lin Y K. 1978. Lower Silurian Graptolites from Tongzi, Northern Guizhou (in Chinese with English summary). Mem Nanjing Inst Geol Palaeont, 12: 1–106
3. Chen X, Rong J Y, Li Y, et al. 2004. Facies patterns and geography of the Yangtze region, South China, through the Ordovician and Silurian transition. Palaeogeogr Palaeoclimatol Palaeoecol, 204: 353–372
4. Chen X, Rong J Y, Zhou Z Y, et al. 2001. The Central Guizhou and Yichang Uplifts, Upper Yangtze region, between Ordovician and Silurian. Chin Sci Bull, 46: 1580–1584
5. Chen X, Xu J T, Cheng H J, et al. 1990. On the Hannan Oldland and Dabashan Uplift (in Chinese). J Stratigr, 14: 81–116