State Key Laboratory of Coal Mine Disaster Dynamics and Control;
College of Resources and Environmental Science;
Chongqing University;
Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Mineral;
Shandong University of Science and Technology;
Key Laboratory of Sedimentary Basin and Oil and Gas Resources;
Ministry of Land and Resources;
State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology;
CAS);
State Key Laboratory for Mineral Deposits Research;
School of Earth Sciences and Engineering;
Institute of Energy Sciences;
Nanjing University;
LOWER; YANGTZE; region; Da-long; Formation; Siliceous; rock; Biological; chert; VOLCANISM;