Lower Cretaceous charophytes from the Serrania de Cuenca,Iberian chain: Taxonomy,biostratigraphy and palaeoecology |
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| Institution: | 1. Universidad Autónoma de Madrid, Departamento de Biología, Unidad de Paleontología, Calle Darwin, 2, Cantoblanco, 28049 Madrid, Spain;2. Laboratoire de Géologie de Lyon, UMR CNRS 5276 LGLTPE, Université Claude-Bernard Lyon 1, 2, rue Raphaël-Dubois, 69622 Villeurbanne, France;1. Departamento de Biologia e Zoologia, Universidade Federal de Mato Grosso, Av. Fernando Corrêa da Costa, 2367, Cuiabá 78060-900, Mato Grosso, Brazil;2. Centre for Integration on Palaeobiology & Unidad de Paleontología, Departamento de Biología, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain;3. Instituto LAMIR, Departamento de Geologia, Universidade Federal do Paraná, Av. Cel. Francisco H. dos Santos, 100, Jardim das Américas, Curitiba 81531-980, Paraná, Brazil;4. Laboratório de Ictiologia de Ribeirão Preto, Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto 14040-901, São Paulo, Brazil;1. Department of Hydrobiology, Adam Mickiewicz University, Faculty of Biology, Umultowska 89, 61-614, Poznań, Poland;2. University of Valencia, Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Carrer del Catedrátic José Beltrán Martinez, 2, 46980, Paterna, Valencia, Spain;3. Department of Biogeography and Paleoecology, Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 10, 61-680, Poznań, Poland;1. Departamento de Geología y Geografía (Grupo de Investigación IberCreta), Universidad de Alcalá, 28871 Alcalá de Henares, Spain;2. Departamento de Paleontología (Grupo de Investigación Procesos Bióticos Mesozoicos), Universidad Complutense de Madrid, 28040 Madrid, Spain;3. Àrea de Prehistòria and Institut Català de Paleoecologia Humana i Evolució Social (IPHES), Universitat Rovira i Virgili, 43003 Tarragona, Spain;4. Departamento de Ciências da Terra (Centro de Investigação da Terra e do Espaço), Universidade de Coimbra, 3000-134 Coimbra, Portugal;5. Departamento de Biología (Laboratorio de Poblaciones del Pasado), Universidad Autónoma de Madrid, 28049 Madrid, Spain;6. Departamento de Física Matemática y de Fluidos (Grupo de Investigación Biología Evolutiva), Universidad Nacional de Educación a Distancia, 28040 Madrid, Spain;7. Departament d''Dinàmica de la Terra i l''Oceà, Universitat de Barcelona, 08028 Barcelona, Spain;8. Departamento de Estratigrafía y Paleontología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 48080 Bilbao, Spain;9. Departamento de Biología (Grupo de Investigación Biología Evolutiva), Universidad Autónoma de Madrid, 28049 Madrid, Spain;1. Departamento Ciencias de la Tierra-IUCA, Universidad de Zaragoza, 50009, Zaragoza, Spain;2. Departamento de Geodinámica, Estratigrafía y Paleontología, Universidad Complutense de Madrid, 28040, Madrid, Spain;3. Departamento de Geología, Universidad de Salamanca, 37008, Salamanca, Spain;4. Instituto de Geosciencias (IGEO), UCM-CSIC, 28040, Madrid, Spain;5. Departament de Geologia, Universitat de València, 46100, Burjassot, Spain |
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| Abstract: | The assemblages of fossil charophyte fructifications from the La Huérguina Formation at the La Huérguina stratotype and the Las Hoyas section, along with some other samples from isolated outcrops are composed of Atopochara trivolvis var. triquetra, Globator maillardii var. trochiliscoides, Globator maillardii var. biutricularis var. nov., Clavator harrisii var. reyi, Ascidiella cruciata and Mesochara harrisii. Some reworked utricles of Ascidiella iberica var. iberica were also found. The in situ assemblage belongs to the Cruciata-Paucibracteatus Biozone, which is Late Barremian–Early Aptian in age. These results confirm that the entire deposition of the La Huérguina Formation took place within this biozone and not earlier, as previously thought. The top of the unit can be limited to the uppermost Barremian with biostratigraphic data from ostracods. Globator maillardii var. biutricularis var. nov. is defined as the end form for the Globator lineage according to present knowledge. It is characterised by its unique utricle morphology, showing a basal ring representing a second, external utricular layer. This layer shows a primitive structure, reminiscent of G. maillardii var. mutabilis, in contrast to the internal utricle, which is more derived and similar to G. maillardii var. trochiliscoides. In comparison with other non-marine formations of the same age in the Iberian Chain and in Europe, the charophyte assemblages from the La Huérguina Formation appear to be relatively poor and monotonous, suggesting that some of the species found elsewhere never reached this part of the basin owing to the brief development of non-marine facies there. The main differences in composition between the samples studied are indicative of the palaeoecological conditions. Atopochara trivolvis triquetra was found to be dominant in shallow lacustrine facies and Globator maillardii var. trochiliscoides and var. biutricularis are associated with temporary lakes from a well-drained palustrine area. Clavator harrisii and Mesochara harrisii thrived on floodplains whereas Ascidiella cruciata grew in palustrine environments with significant edaphic activity. |
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