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 ...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.展开更多
记述了四川省资中县金李井镇碾盘山村中侏罗统沙溪庙组下段(J2s1)中的12个恐龙足迹,将其鉴定为船城足迹属(Chuanchengpus ichnogen Young et Young,1987),命名为圣灵山船城足迹(Chuanchengpus shenglingshanensis ichnosp.nov.)一新种...记述了四川省资中县金李井镇碾盘山村中侏罗统沙溪庙组下段(J2s1)中的12个恐龙足迹,将其鉴定为船城足迹属(Chuanchengpus ichnogen Young et Young,1987),命名为圣灵山船城足迹(Chuanchengpus shenglingshanensis ichnosp.nov.)一新种。新种的特征为:个体小,无前足足迹,但具尾迹。足迹长7.2cm,宽8.7cm。两足行走,三趾型,趾行式。Ⅱ趾和Ⅳ趾较短,呈椭圆形。Ⅲ趾粗长,呈长椭圆形。趾间角为Ⅱ29°Ⅲ27°Ⅳ。足长与足迹复步长之比为1∶6.6。行迹呈直线,步角度为155°。对船城足迹属的分类位置进行了修订,认为应将其归属于虚骨龙次亚目(Infraorder Coelurosauria)的安琪龙足迹科(Ichonofamily Anchisauripodi-dae)。展开更多
基金supported by the National Natural Science Foundation of China (Grant No.41772008)the State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology, CAS)(Grant No.173127)and the comprehensive geological and mineral survey in Wumeng mountainous area conducted by China Geological Survey (Grant No.121201010000150002)
文摘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.
文摘记述了四川省资中县金李井镇碾盘山村中侏罗统沙溪庙组下段(J2s1)中的12个恐龙足迹,将其鉴定为船城足迹属(Chuanchengpus ichnogen Young et Young,1987),命名为圣灵山船城足迹(Chuanchengpus shenglingshanensis ichnosp.nov.)一新种。新种的特征为:个体小,无前足足迹,但具尾迹。足迹长7.2cm,宽8.7cm。两足行走,三趾型,趾行式。Ⅱ趾和Ⅳ趾较短,呈椭圆形。Ⅲ趾粗长,呈长椭圆形。趾间角为Ⅱ29°Ⅲ27°Ⅳ。足长与足迹复步长之比为1∶6.6。行迹呈直线,步角度为155°。对船城足迹属的分类位置进行了修订,认为应将其归属于虚骨龙次亚目(Infraorder Coelurosauria)的安琪龙足迹科(Ichonofamily Anchisauripodi-dae)。
