Recently, XUE Yan, a PhD candidate at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (NIGPAS), working under the supervision of Professors ZHENG Daran and LI Gang and collaborating with Professor JING Zhenhua from the Chengdu University of Technology, conducted a multi-proxy geochemical investigation on the Jiufengshan Formation at the Shiyoukuangtun section in the Dayangshu Basin, eastern Inner Mongolia. Along with systematic paleontological and comprehensive stratigraphical work, this study integrated stable organic carbon isotope analyses, Rock-Eval pyrolysis, iron speciation, and redox-sensitive trace-element geochemistry to reconstruct the lake ecosystem and bottom-water conditions that prevailed when the Jehol Biota inhabited the basin. It further examined the relationship between organic-matter enrichment and fossil preservation. The results were published in the journal Palaeogeography, Palaeoclimatology, Palaeoecology.