Recently, Dr. LUAN Xiaocong and Prof. ZHAN Renbin from Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (NIGPAS), in collaboration with colleagues from University of Saskatchewan and Western University, Canada, have examined these iron ooids through extensive field surveys and in-depth sedimentological and geochemical analyses on various iron-bearing successions and iron ooids across different regions on the Upper Yangtze region, South China. Related results have been published in Journal of Stratigraphy (in Chinese with English abstract) and Sedimentology, respectively.