Paleoenvironmental setting and description of an estuarine oyster reef in the Eocene of Patagonia,southern Argentina |
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| Affiliation: | 1. XR-GEOMAP, R. Durand Av. N 397, Grand Bourg, Salta, Argentina;2. Universidad Nacional de Río Negro, Av. Roca 1242, 8332 General Roca, Río Negro, Argentina;3. University of Saskatchewan, Department of Geological Sciences, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada;4. Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina;1. Instituto de Geofisica, Universidad Nacional Autónoma de México, México, D.F., Mexico;2. Departamento de Ingeniería Civil y Topografía, CUCEI, Universidad de Guadalajara, México;3. Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional, Instituto Politécnico Nacional, Oaxaca, Mexico;4. Programa de Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico, D.F., Mexico;5. Universidad Nacional Autónoma de México, D.F., Mexico;1. Departamento de Física, Universidad de Concepción, Casilla 160-C, Concepción, Chile;2. Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy;3. Instituto Nazionale di Fisica Nucleare (INFN), Sezione di Torino, Via Pietro Giuria 1, 10125 Torino, Italy;4. Departamento de Ciencias Fisicas, Universidad Andres Bello, Republica 220, Santiago, Chile;1. Departamento de Ciencias de la Tierra y Medio Ambiente, Universidad Alicante, Apdo. 99, San Vicente del Raspeig, 03080 Alicante, Spain;2. Departamento de Paleontología, Facultad de Ciencias Geológicas. Universidad Complutense, C/José Antonio Novais, 12, 28040, Madrid, Spain;1. Departamento de Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile;2. ARC Centre of Excellence in Ore Deposits, School of Earth Sciences, University of Tasmania, Hobart, Australia;3. Departamento de Matemáticas, Universidad Católica del Norte, Antofagasta, Chile |
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| Abstract: | A middle Eocene Crassostrea sp. reef near Río Turbio, southwestern Patagonia (Argentina), represents the earliest record of an oyster reef associated with estuarine facies in the southern hemisphere, and also one of the few known worldwide occurring in Paleogene rocks. The reef grew in an outer estuary environment subject to periodic changes in salinity and may have reached a maturing phase. The Río Turbio reef – by its dimensions, geometry, and substrate lithology– would have been located in a tidal channel convergence area. This reef provides new evidence suggesting that estuaries served as refuges for Crassostrea populations allowing them to disperse into fully marine environments many times throughout the Cenozoic. |
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| Keywords: | Oyster reef Middle Eocene Río Turbio Formation Patagonia Argentina |
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