Fig. 1

Maps showing the locality of pliosauroid fossils in Yunyang. a A sketch map of China showing the geographical locations of Sichuan Basin and Chongqing City. The base map of China is modified after the Standard Map Service of the National Administration of Surveying, Mapping and Geoinformation of China (http://bzdt.ch.mnr.gov.cn/) (No. GS (2016)1585); b Locality of Yunyang county (marked by a black rectangle); c Locality of Pu’an town in Yunyang (marked by a black rectangle and pliosauroid silhouette); d Fossil sites in Pu’an town