Paleontology,sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation,Chubut Province,Argentina |
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| Authors: | Oscar F Gallego Nora G Cabaleri Claudia Armella Wolfgang Volkheimer Sara C Ballent Sergio Martínez Mateo D Monferran Diego G Silva Nieto Manuel A Páez |
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| Institution: | 1. Micropaleontología, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste y Área Paleontología, Centro de Ecología Aplicada del Litoral, Consejo Nacional de Investigaciones Científicas y Técnicas, C.C.128, C.P. 3400 Corrientes, Argentina;2. Instituto de Geocronología y Geología Isotópica, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina;3. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, Centro Científico – Tecnológico, Consejo Nacional de Investigaciones Científicas y Técnicas, C.C. 330, 5500 Mendoza, Argentina;4. División Paleontologia Invertebrados, Facultad de Ciencias Naturales y Museo, Pasaje Teruggi s/n, Paseo del Bosque, La Plata 1900; Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;5. Dpto. Evolución de Cuencas, Facultad de Ciencias, Iguá 4225, 11400 Montevideo, Uruguay;6. Servicio Geológico Minero Argentino, Instituto de Geología y Recursos Minerales, Av. Julio A. Roca 651, 10° Piso, C1067ABB Buenos Aires, Argentina;7. Comisión Nacional de Energía Atómica, Regional Patagonia, C.C. 178, Parque Industrial, 9100 Trelew, Chubut, Argentina;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. Naturhistorisches Museum Basel, Augustinergasse 2, CH-4001 Basel, Switzerland;4. Museo del Jurásico de Asturias MUJA (Jurassic Museum of Asturias), Colunga E-33328, Spain;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;1. Department of Geosciences, University of Oslo, P.O. Box 1047, 0316 Oslo, Norway;2. Statoil Research Centre, N-7005 Trondheim, Norway;3. Det norske oljeselskap ASA, P.O. Box 2070, 0125 Oslo, Norway;1. Departamento de Paleobiología, Museo Nacional de Ciencias Naturales-CSIC, C/ José Gutiérrez Abascal 2, 28006 Madrid, Spain;2. Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, C/ Darwin 2, Madrid, Spain;3. Grupo de Biología, Departamento de Física Matemática y Fluidos, Facultad de Ciencias, UNED, C/ Senda del Rey 9, 28040 Madrid, Spain;4. Department of Geological Sciences, University of Cape Town, South Africa;5. Departamento de Ciencias de la Tierra y del Medio Ambiente, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain;6. Museo Paleontológico de Elche-Fundación Cidaris, Plaza de San Juan, s/n, 03203 Elche, Spain;7. School of Earth, Atmospheric & Environmental Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom;8. School of Earth Sciences, University of Bristol, 24 Tyndall Avenue, Bristol, BS8 1TQ, United Kingdom;1. Institute of Geology & Mineralogy, Zuelpicher Strasse 49b, 50674 Cologne, Germany University of Cologne, Germany;2. Isotope Geosciences Unit, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK;1. Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden;2. Geological Survey of Norway, Post Box 6315 Sluppen, NO-7491 Trondheim, Norway |
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| Abstract: | A new Late Jurassic assemblage of “conchostracans”, ostracods, bivalves and caddisfly cases from the locality “Estancia La Sin Rumbo”, Chubut Province (Patagonia, Argentina) is recorded. The fossils occur in the upper part of an outcropping 45 m thick volcaniclastic lacustrine sequence of yellowish tuffs and tuffites of the Puesto Almada Member, which is the upper member of the Cañadón Asfalto Formation with U/Pb age of 161 ± 3 Ma. The sequence represents one sedimentary cycle composed of a (lower) hemicycle of expansion and a (higher) hemicycle of contraction of the water body. The invertebrates lived in small freshwater bodies during the periods of expansion of the lake. The occurrence of a great number of small spinicaudatans, associated with mud-cracks, is evidence of dry climatic conditions and suggests several local mortality events. The spinicaudatan record of the fushunograptid–orthestheriid (component of the Eosestheriopsis dianzhongensis fauna) and the presence of Congestheriella rauhuti Gallego and Shen, suggest a Late Jurassic (Oxfordian to Tithonian) age. Caddisfly cases are recorded for the first time in the Cañadón Asfalto Basin. |
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