1. Arthur, J.B., Chen, X., Christopher R., S., Robert J., M., 2013. Phanerozoic paleoclimate: an atlas of lithologic indicators of climate. Tulsa: SEPM Soc. Sediment. Geol.
2. Chaletskaya, O.N., 1960. New species of the Llandovery graptolites of Central Asia. 373–375. In Markovsky, B.P. (ed.) New species of ancient plants and invertebrates in the USSR. II. Gosudarstvennoe Nauchno-Teknicheskoye Izdatel’stvo, Moscow (In Russian).
3. Subdivision and delineation of the Wufeng and Lungmachi black shales in the subsurface areas of the Yangtze Platform;Chen;J. Stratigr.,2015
4. Stage-progressive distribution pattern of the Lungmachi black graptolitic shales from Guizhou to Chongqing;Chen;Central China. Sci. China Earth Sci.,2017
5. Circumjacent distribution pattern of the Lungmachian graptolitic black shale (early Silurian) on the Yichang Uplift and its peripheral region;Chen;Sci. China Earth Sci.,2018