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      Primer registro de palinomorfos de edad pérmica en la Formación Río Francia (Paleozoico Superior, San Juan, Argentina) Translated title: First record of Permian age palynomorphs in the Río Francia Formation (Upper Paleozoic, San Juan, Argentina)

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          Abstract

          En este trabajo se presenta el contenido palinológico de las secciones media y alta de la Formación Río Francia (Cuenca Paganzo). De niveles carbonosos de la sección media de la unidad se obtuvieron dos asociaciones palinológicas atribuibles a la Biozona DM (Raistrickia densa-Convolutispora muriornata), dominadas por esporas trilete y escasos granos de polen monosacados. De lutitas carbonosas de la parte superior de la Formación Río Francia, se obtuvo una tercera asociación palinológica, dominada por granos de polen bisacados, monosacados y estriados, con escasas esporas triletes. Entre sus componentes se destacan la presencia de Vittatina costabilis Wilson emend. Tschudy & Kosanke, V. subsaccata Samoilovich emend. Jansonius, V. minima Jansonius, Striatopodocarpites cancellatus (Balme & Hennelly) Hart, S. phaleratus (Balme & Hennelly) Hart, Kraeuselisporites punctatus Jansonius, Barakarites rotatus (Balme & Hennelly) Bhardwaj & Tiwari, Tuberisaccites varius Lele & Makada, Polarisaccites bilaterales Ybert & Marques-Toigo, y los granos de polen regularmente preservados que son referibles a los géneros Lueckisporites, Weylandites, Klausipollenites y Minutosaccus. Estos elementos permiten sugerir que esta asociación podría ubicarse en el lapso Cisuraliano-Guadalupiano, muy probablemente sería referible a la Biozona LW (Lueckisporites-Weylandites). Por lo tanto, a partir de su contenido palinológico, la Formación Río Francia puede referirse al parte del intervalo Pennsylvaniano-Cisuraliano/Guadalupiano.

          Translated abstract

          The palynological content of the middle and upper section of the Río Francia Formation (Paganzo Basin) is here presented. Two palynological associations referable to DM Biozone (Raistrickia densa-Convolutispora muriornata), dominated by trilete spores and scarce monosaccate pollen grains, were obtained from carbonaceous levels of the middle section of the unit. An association dominated by the bisaccate, monosaccate, striated pollen grains and scarce trilete spores, that between their components outstand the presence of Vittatina costabilis Wilson emend. Tschudy & Kosanke, V. subsaccata Samoilovich emend. Jansonius, V. minima Jansonius, Striatopodocarpites cancellatus (Balme & Hennelly) Hart, S. phaleratus (Balme & Hennelly) Hart, Kraeuselisporites punctatus Jansonius, Barakarites rotatus (Balme & Hennelly) Bhardwaj & Tiwari, Tuberisaccites varius Lele & Makada, Polarisaccites bilaterales Ybert & Marques-Toigo, and regularly preserved grains referable to the genera Lueckisporites, Weylandites, Klausipollenites and Minutosaccus; belong to carbonaceous shales of the upper part of the formation; that would allow to suggest a Cisuralian-Guadalupian age for this association, equivalent to LW Biozone (Lueckisporites-Weylandites), more likely. Río Francia Formation age is considered, from it palynological content, Pennsylvanian-Cisuralian/Guadalupian.

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          Most cited references 78

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          Fossil in situ spores and pollen grains: an annotated catalogue

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            Permian palynostratigraphy of the Collie Basin, Western Australia

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              Permian plant microfossils from the Blair Athol Coal Measures, Baralaba coal Measures, and Basal Rewan Formation of Queenland

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rmacn
                Revista del Museo Argentino de Ciencias Naturales
                Rev. Mus. Argent. Cienc. Nat.
                Museo Argentino de Ciencias Naturales Bernardino Rivadavia e Instituto Nacional de Investigación de las Ciencias Naturales (Ciudad Autónoma de Buenos Aires )
                1853-0400
                December 2010
                : 12
                : 2
                : 203-216
                Affiliations
                [1 ] Consejo Nacional de Investigaciones Científicas y Técnicas Argentina
                [2 ] Museo Argentino de Cs. Naturales B. Rivadavia Argentina
                [3 ] UNSJ Argentina
                Article
                S1853-04002010000200005
                Product
                Product Information: website
                Categories
                ZOOLOGY

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