Fig. 1

Maps of the fossil locality in Tongnan District, Sichuan Basin, China. The star represents the fossil site. (A) Sketch map of China showing the geographical locations of Sichuan Basin. 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 Tongnan District (marked by a irregular black area); (C) Fossil site and its geological background (marked by a red rectangle in B) modified from the 1:200 000 standard map of Suining (Map No.: H-48-(16) published in 1981).