Late Triassic sauropodomorph and Middle Jurassic theropod tracks from the Xichang Basin,Sichuan Province,southwestern China:First report of the ichnogenus Carmelopodus

作者：Li-Da Xing,Jin Ba,Martin G.Lockley,Hendrik Klein,5heng-Wu Yon,Anthony Romilio,Chun-Yong Chou,Vtl.Scott Persons IV

摘要：Upper Triassic and Middle Jurassic strata of the Xichang Basin in Sichuan Province, southwestern China, yielded important dinosaur ichnofossils. From the Xujiahe Formation of the Yiguojiao tracksite, we report a Late Triassic footprint assemblage in China and the first discovery of diagnostic Triassic sauropodomorph tracks in this region. The tracks share a number of features in common with the ichnogenera Eosauropus(Late Triassic) and Liujianpus(Early Jurassic). The neighboring Bingtu tracksite is stratigraphically younger(Shaximiao Formation, Middle Jurassic) and preserves small tridactyl theropod tracks that represent the first occurrence of the ichnotaxon Carmelopodus in China and Asia. While these tracks are morphologically comparable to those from the Middle Jurassic type locality in North America, the specimens from China show the proximal margin of the digit IV impression in a more cranial position, which may indicate a trackmaker with a relatively short metatarsal IV. In addition to the skeletal record, the Carmelopodus footprints document the presence of small theropods in the dinosaur fauna of the Middle Jurassic Shaximiao Formation.

发文机构：State Key Laboratory of Biogeology and Environmental Geology School of Earth Sciences and Resources State Key Laboratory of Palaeobiology and Stratigraphy Sichuan Institute of Geological Survey Dinosaur Trackers Research Group Saurierwelt Palaontologisches Museum School of Biological Sciences Department of Biological Sciences

关键词：SauropodomorphTHEROPODFOOTPRINTIchnofossilUpperTRIASSICXujiaheFORMATIONMiddleJurassicShaximiaoFORMATIONXichangBasinSichuanProvince

分类号： P[天文地球]