ACKNOWLEDGMENTS
We thank X. C. Wu for kindly sharing the photographs of Nanchangosaurus (SSTM 5025), and Q. Li for his help in drawing the geological map. We also thank B. Y. Xiang, Y. F. Shen and other members from paleontological lab of HFUT for field assistance, L.-y. Li for fossil preparation, and H. Wu and B. C. Zhou for specimen access. Editor E. Maxwell and two anonymous reviewers made constructive suggestions for the improvement of the manuscript. This work was supported by the National Natural Science Foundation of China (grant numbers 41772003, 41402015), the State Key Laboratory of Palaeobiology and Stratigraphy (grant number 173117), the Fundamental Research Funds for the Central Universities of China (grant numbers PA2018GDQT0007, PA2018GDQT0020), and the China Postdoctoral Science Foundation (grant number 2018M642511).