Abstract
The Yangouxia dinosaur tracksites are well known for a diverse assemblage of tetrapod tracks preserved as natural impressions (concave epireliefs) on large bedding planes, representing a locally widespread surface marking the transition from a sand- to a mud-dominated sequence in the Hekou Group. Previous ichnological studies at these large sites have focused on the morphology and ichnotaxonomy of the tracks, including a single trackway representing the first pterosaur tracks reported from China. Here, we report a distinctly different assemblage associated with minor sandstones in the mud-dominated sequence 20 m above the main tracksite level. This assemblage consists of at least 20 pterosaur manus track casts attributed to a single ichnotaxon (Pteraichnus). No pes tracks have been identified. These tracks mostly occur in random orientations, although one possible trackway segment is inferred, to represent walking progression. Manus-only pterosaur track assemblages are common and likely reflect differential registration depths of manus and pes and/or sub optimal preservation conditions. The tracks are associated with distinctive invertebrate traces including Cochlichnus, Spongeliomorpha and Paleophycus and suggest the pterosaurs were likely feeding on the invertebrate tracemakers.
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Acknowledgments
We thank M. S. Oh, Y. S. Cho with Department of Earth Science Education, Korea National University of Education, South Korea for their participation in field research. We also thank Lisa Buckley with Peace Region Palaeontology Research Centre, Canada and Jianjun Li with Department of Research, Beijing Museum of Natural History, Beijing, China for their helpful suggestions. This work was supported by the Liujiaxia Dinosaurs National Geopark, and the 2013 Supporting Fund for Graduate Student’s Science and Technology Innovation from China University of Geosciences (Beijing), China.
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11434_2014_681_MOESM1_ESM.tif
S1 Stratigraphic sections of the Lower Cretaceous Hekou Group in the study area showing the position of footprint horizons. Note the association of many dinosaur track levels in the lower sand dominated sequences and the occurrence of the pterosaur tracksite in the dominantly fine grained (mud-shale succession) (TIFF 656 kb)
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Li, D., Xing, L., Lockley, M.G. et al. A manus dominated pterosaur track assemblage from Gansu, China: implications for behavior. Sci. Bull. 60, 264–272 (2015). https://doi.org/10.1007/s11434-014-0681-z
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DOI: https://doi.org/10.1007/s11434-014-0681-z