Microbially-induced sedimentary wrinkle structures and possible impact of microbial mats for the enhanced preservation of dinosaur tracks from the Lower Cretaceous Jiaguan Formation near Qijiang (Chongqing,China) |
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| Institution: | 1. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;2. Naturhistorisches Museum Basel, Augustinergasse 2, Basel CH-4001, Switzerland;3. Department of Biological Sciences, University of Alberta 11455 Saskatchewan Drive, Edmonton, Alberta T6G 2E9, Canada;4. Qijiang District Bureau of Land Resources, Chongqing 401420, China;1. Museum of Natural History, University of Wroc?aw, Sienkiewicza 21, 50-335, Wroc?aw, Poland;2. Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine, Bogdana Khmel''nitskogo 15, Kiev, 01601, Ukraine;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People''s Republic of China;2. Lebanese University, Faculty of Sciences II, Department of Biology, Fanar Matn P.O. Box 26110217, Lebanon;3. Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005 Paris, France;1. CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China;2. School of Resources and Environmental Engineering, Anhui University, Hefei 230039, China;1. Chongqing Laboratory of Geoheritage Protection and Research, No. 208 Hydrogeological and Engineering Geological Team, Chongqing Bureau of Geological and Mineral Resource Exploration and Development, 400700 Chongqing, China;2. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Science, 100044 Beijing, China;3. CNRS (UMR 8538), Laboratoire de Géologie de l’École Normale Supérieure, PSL Research University, 24, rue Lhomond, 75231 Paris Cedex 05, France;4. Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, 44150 Maha Sarakham, Thailand;5. Chongqing Institute of Geological Survey, 401122 Chongqing, China |
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| Abstract: | Recently, a paleosurface with microbially-induced sedimentary wrinkle structures that are associated with abundant, well-preserved, iguanodon-type, tridactyl tracks has been documented at the Lotus tracksite near Qijiang (Chongqing, China) in fluvial deposits of the Lower Cretaceous Jiaguan Formation. Two different wrinkle structure types are identified and described from a macroscopic point of view and also by applying microstructure analysis with a scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) and other high-resolution instruments, that detected sheath-like and globular organic matter and thus confirm the microbial origin of the observed wrinkle structures. A model for the formation of the two microbial mat induced wrinkle structure types and associated preservation of dinosaur tracks is proposed. Finally, some human footprints were left in comparable modern environments covered with a thin microbial mat, and they are used as a modern analog in order to better understand the track formation and preservation mechanisms of the dinosaur tracks of the Lotus tracksite. |
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| Keywords: | Microbial mat MISS Wrinkle structure Dinosaur track Lower Cretaceous Floodplain Neoichnology |
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