A diversified vertebrate ichnite fauna from the Feitianshan Formation (Lower Cretaceous) of southwestern Sichuan,China |
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| Institution: | 1. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;2. Dinosaur Tracks Museum, University of Colorado Denver, PO Box 173364, Denver CO 80217, USA;3. Regional Geological Survey Team, Sichuan Bureau of Geological Exploration and Development of Mineral Resources, Chengdu, China;4. Peace Region Palaeontology Research Centre, Box 1540, Tumbler Ridge, British Columbia V0C 2W0, Canada;5. Saurierwelt Paläontologisches Museum, Alte Richt 7, D-92318 Neumarkt, Germany;6. Department of Biological Sciences, University of Alberta 11455 Saskatchewan Drive, Edmonton, Alberta T6G 2E9, Canada;7. No.208 Hydrogeological and Engineering Geological Team, Chongqing Bureau of Geological and Mineral Resource Exploration and Development, Chongqing 400700, China;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences, Nanjing 210008, China;4. Steinmann Institute, University of Bonn, Bonn 53115, Germany;5. Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK;1. Plaza de las Viñas n18 PC, 18200 Maracena, Granada, Spain;2. Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovi?ova 6, 84215 Bratislava, Slovakia;3. Geological-Paleontological Department, Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria;4. Florida Museum of Natural History, University of Florida, 1659 Museum Road, PO Box 117800, Gainesville, FL 32611, USA;1. Aragosaurus–IUCA, Paleontología, Facultad de Ciencias, Universidad de Zaragoza, 50009, Zaragoza, Spain;2. Universitat Autònoma de Barcelona, Facultat de Ciències (Geologia), 08193, Bellaterra, Barcelona, Spain;3. Institut Català de Paleontologia Miquel Crusafont, C/ Escola Industrial 23, 08201, Sabadell, Spain;4. CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Av. Roca 1242, General Roca, 8332, Río Negro, Argentina;5. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Roma, Italy;6. Departamento de Ingeniería del Terreno, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain;7. Museu de la Conca Dellà, C/ del Museu 4, 25650, Isona i Conca Dellà, Lleida, Spain;1. Grupo de Investigación IberCreta, Departamento de Geología y Geografía, Universidad de Alcalá de Henares, 28871 Alcalá de Henares, Spain;2. Grupo de Investigación Procesos Bióticos Mesozoicos, Departamento de Paleontología, Universidad Complutense de Madrid, 28040 Madrid, Spain;3. Grupo de Investigación Aragosaurus-IUCA, Departamento de Paleontología, Universidad de Zaragoza, 50009 Zaragoza, Spain;4. Museu Nacional de História Natural e da Ciência, Universidade de Lisboa, 1250-102 Lisboa, Portugal;5. Centro de Investigação da Terra e do Espaço da UC-CITEUC, Universidade de Coimbra, 3000-134 Coimbra, Portugal;1. Museo Municipal “Jerónimo Molina”, E-30520, Jumilla, Murcia, Spain;2. Departamento de Estratigrafía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain;3. Instituto de Geociencias IGEO (CSIC, UCM), c. José Antonio Nováis 12, E-28040 Madrid, Spain;4. Universidad de La Rioja, Edificio CT, c. Madre de Dios 51-53, E-26006 Logroño, Spain |
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| Abstract: | The Bajiu tracksite exposed on a fine sandstone surface at the top of the Feitianshan Formation, close the contact with the overlying Xiaoba Formation, reveals a saurischian dominated ichnofauna consisting of four sauropod and at least eight theropod trackways. The sauropod trackways display a medium-wide gauge pattern characteristic of titanosauriforms, while the theropod trackways can be subdivided into two distinct morphotypes. One is similar to the ichnogenera Eubrontes and Megalosauripus, the other (cf. Dromaeopodus) appears to represent a functionally didactyl dromaeosaur where pedal digit II is represented only by an oval basal pad. A single swim track is possibly attributable to a turtle or crocodylian. Such sauropod-theropod dominated ichnofaunas are consistently typical of the red-bed tracksites in the region and useful for characterizing a fauna that is otherwise poorly known from body fossils. The stratigraphic position and late occurrence of the (typical Jurassic) Eubrontes-Megalosauripus morphotype is well known from other Cretaceous localities in China and seems to reflect a peculiarity in the theropod faunas of East Asia. |
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| Keywords: | Lower Cretaceous Feitianshan formation |
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