Late Miocene freshwater mussels from the intermontane Chota Basin,northern Ecuadorean Andes |
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| Institution: | 1. Research Unit Palaeontology, Geological Institute, Ghent University, Krijgslaan 281-S8, B-9000 Gent, Belgium;2. North Carolina Museum of Natural Sciences, 11 West Jones Street, Raleigh, NC 27601, USA;3. Centre for X-ray Tomography, Ghent University (UGCT), Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium;1. Univ. Lille, CNRS, Univ. Littoral Côte d''Opale, UMR 8187, LOG, Laboratoire d''Océanologie et de Géosciences, F 59000 Lille, France;2. Petroamazonas EP, Av. Naciones Unidas E-7-95 y Av. De los Shyris, Quito, Ecuador;3. Univ. Rennes, CNRS, Géosciences Rennes - UMR 6118, F-35000 Rennes, France;4. Department of Geoscience and Petroleum, Norwegian University of Science and Technology (NTNU), S.P. Andersens veg 15a, 7491 Trondheim, Norway;5. Escuela Politécnica Nacional, Facultad de Geología, Quito, Ecuador;6. BioStrat Solutions, CAPE pour EDE, 4 Rue des Buisses, 59000 Lille, France |
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| Abstract: | Prior to the development of the modern Amazonian drainage network during the Late Miocene-Early Pliocene, large areas of western Amazonia may have been occupied by an extensive lacustrine and wetland environment known as the Pebas and Acre systems. These depositional systems are thought to have formed in response to foreland subsidence east of the uplifting Andes. Based on the occurrence at a present-day elevation of 1600 m of fossil pearly freshwater mussels of the genus Anodontites (indet. species) in intermontane Chota Basin of northern Ecuador (the westernmost South American fossil record for this genus), we discuss their potential implications for understanding of westernmost limit of the Miocene wetland ecosystem and consequently a later timing for the regional uplift of the Eastern Cordillera. |
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| Keywords: | Bivalvia Chota formation Pebas/Acre system Paleobiogeography Inter-Andean valley |
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