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Xing L.-D.,China University of Geosciences | Xing L.-D.,University of Alberta | Lockley M.G.,University of Colorado at Denver | Li Z.-D.,Geophysical Team of Sichuan Bureau of Geological and Mineral Investigation and Exploration | And 7 more authors.
Palaeoworld | Year: 2013

Theropod footprints from the Middle Jurassic Xincun Formation in the Panxi region (Sichuan Province, Southwest China) show strong similarities to the ichnogenus Kayentapus. They are characterized by slender digits, wide digit divarication, and a characteristic pad configuration that is different from other Jurassic theropod ichnotaxa. At the Shansong tracksite, three trackways are present, each consisting of four consecutive tracks (stride and pes lengths up to 200. cm and 36. cm, respectively). The speed of the trackmakers has been calculated with values between 1.1 and 1.4. m/s. The assemblage is a further document of a Middle Jurassic occurrence of this morphotype that is basically known from the Lower Jurassic deposits elsewhere. This could be due to peculiarities of theropod communities in this region, reflecting a different paleobiogeographic distribution pattern in the Middle Jurassic. Biostratigraphically, ostracods lend support to a Middle Jurassic age of the trackbearing unit. This corresponds partly with data from the Shangshaximiao Formation that is considered to be of Middle Jurassic age based on ostracods but Late Jurassic age based on vertebrate skeletons. The ichnological record and the presence of Kayentapus-like footprints in both units support a Lower-Middle Jurassic age. © 2012 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS.

Xing L.,China University of Geosciences | Lockley M.G.,University of Colorado at Denver | Zhang J.,China University of Geosciences | Klein H.,Saurierwelt Palaontologisches Museum | And 4 more authors.
Historical Biology | Year: 2015

A dinosaur tracksite in the Lower Jurassic Ziliujing Formation of Sichuan Province, China consists of a spectacular sub-vertical exposure, with multiple track-bearing levels and trackways showing parallel and bimodal orientations. Based on well-preserved material, the new ichnogenus and ichnospecies, Liujianpus shunan ichnogen. nov. ichnosp. nov. is erected to accommodate distinctive sauropodomorph trackways occurring in this assemblage. Liujianpus has a unique combination of features, some relating to the early Jurassic basal sauropodomorph (prosauropod in traditional usage) ichnogenus Otozoum, others to the sauropod ichnogenus Brontopodus. Despite such a mix of basal sauropodomorph- and sauropod-like features, the trackmaker of Liujianpus is likely a basal sauropodomorph. This identification is consistent with the occurrence of basal sauropodomorph skeletons from geographically and chronologically close localities. The other distinct morphotype from the tracksite is linked to a sauropod trackmaker. As such, the ichnofauna consisting of two distinct foot morphotypes reflects the diversity of sauropodomorph dinosaurs in the Early Jurassic of Asia. © 2015 Taylor & Francis

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