Geological records of fossils layer and death process and taphonomy of dinosaurs in Cretaceous in Tianyuan, Zhuzhou

Based on the study of regional geological data, the authors recognized 3 sedimentary events in the Upper Cretaceous formation for the first time, with the 3 geological records being exposure geological record, flood geological record and earthquake geological record. In addition, on the basis of lots of scientific statistics of gravels, the authors discussed the paleocurrent direction as well as provenance of the lake basins in Tianyuan of Zhuzhou systematically. The authors found that dinosaurs lived on the west bank of a long narrow NE-SW distributed lake in the south part of the Zhuzhou lake basin. Based on the results obtained, the authors infer that local volcano (?), earthquake, landslide and pluvial events are the reasons for paleocimate change and animals' death as well as the main reasons for the death of dinosaurs in the palaeoenvironment with dry weather and scarce forest vegetation. The burial process was closely related to the delta deposit system from channel alluvial.