Sauropod Teeth from the Lower Cretaceous Luohandong Formation of Ordos Basin,Inner Mongolia  

作　　者：HOU Yandong ZHANG Lifu JIANG Shan JI Shu-an 

机构地区：[1]Institute of Geology,Chinese Academy of Geological Sciences [2]Administration of the National Natural Protection Region on the Otog Dinosaur Tracks [3]Natural History Museum of Guangxi

出　　处：《Acta Geologica Sinica(English Edition)》2017年第3期791-796,共6页地质学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant No.41372026);China Geological Survey(Grant Nos.DD20160120, 12120114026801)

摘　　要：The Early Cretaceous Zhidan Group in the northern Ordos Basin, Inner Mongolia, yielded a large number of tetrapods, including turtles, choristoderes, crocodyliforms, psittacosaurs, stegosaurs, theropods and birds. Well-preserved sauropod teeth have been found in the Luohandong Formation, a middle-upper unit of the Zhidan Group. The large V-shaped wear facet, low slenderness index value, labial grooves, lingual ridge and concavity on the tooth crown suggest that these teeth are from titanosauriforms. Moreover, the presence of the prominent bosses on the lingual side of the tooth crown indicates these teeth should be identified as Euhelopus teeth further. The existence of Euhelopus in Ordos Basin （Inner Mongolia）, Shandong Province and western Liaoning Province shows some connections about vertebrate faunas during Early Cretaceous in these areas. Other tetrapod groups such as turtles （Sinemys, Ordosemys）, choristoderes （Ikechosaurus）, psittacosaurs （Psittacosaurus） and birds （Cathayornis） provide more evidences for this viewpoint.The Early Cretaceous Zhidan Group in the northern Ordos Basin, Inner Mongolia, yielded a large number of tetrapods, including turtles, choristoderes, crocodyliforms, psittacosaurs, stegosaurs, theropods and birds. Well-preserved sauropod teeth have been found in the Luohandong Formation, a middle-upper unit of the Zhidan Group. The large V-shaped wear facet, low slenderness index value, labial grooves, lingual ridge and concavity on the tooth crown suggest that these teeth are from titanosauriforms. Moreover, the presence of the prominent bosses on the lingual side of the tooth crown indicates these teeth should be identified as Euhelopus teeth further. The existence of Euhelopus in Ordos Basin （Inner Mongolia）, Shandong Province and western Liaoning Province shows some connections about vertebrate faunas during Early Cretaceous in these areas. Other tetrapod groups such as turtles （Sinemys, Ordosemys）, choristoderes （Ikechosaurus）, psittacosaurs （Psittacosaurus） and birds （Cathayornis） provide more evidences for this viewpoint.

关 键 词：Lower Cretaceous Luohandong Formation Ordos Basin SAUROPODA Euhelopus 

分 类 号：P534.53[天文地球—古生物学与地层学] Q915[天文地球—地质学]