Palinología del Pérmico Inferior en la perforación DCLS-24 (Formación San Gregorio), departamento de Cerro Largo, Uruguay. Parte I: esporas, algas, prasinofitas y acritarcas
Abstract
Resumen. El presente trabajo consiste en el análisis palinológico de cuatro muestras provenientes de la perforación DCLS24, realizada por DINAMIGE cuya litología corresponde a pelitas negras laminadas formadas en un ambiente glaciomarino, asignables a la Formación San Gregorio, de edad pérmica temprana. Las asociaciones encontradas están compuestas por esporas, granos de polen, algas, acritarcas y algunos elementos de afinidad incierta. En esta contribución se realiza la descripción sistemática de 38 especies de esporas, seis de algas, un acritarca y dos de afinidad incierta. Se describen por primera vez para el Pérmico de Uruguay Leiotriletescorius Kar y Bose, Brevitriletesleptoacaina Jones y Truswell, B. parmatus (Balme y Hennelly) Backhouse, Grossusporitesmicrogranulatus (Menéndez y Azcuy) Pérez Loinaze y Césari, Lundbladisporaareolata Césari, Archangelsky y Seoane, Cristatisporitesmenendezii (Menéndez y Azcuy) Playford, C. chacoparanaensis Ottone, Pilasporites sp. B Stephenson y Osterloff y Brazileaplurigenus (Balme y Hennelly) Foster. Abstract. PALINOLOGY OF LOWER PERMIAN AT THE DCLS-24 WELL (SAN GREGORIO FORMATION), CERRO LARGO DEPARTMENT, URUGUAY. PART 1: SPORES, ALGAE, PRASYNOPHYCEAE, ANDACRITARCHS.The palynological contents of four samples of the borehole DCLS24 (made by DINAMIGE) are analysed. Their lithology consists of black laminated clay formed in a glacio-marine environment, assigned to the upper part of the San Gregorio Formation (Early Permian). The assemblages found are composed by spores, pollen grains, algae, acritarchs and some elements of uncertain affinities. In this contribution, 38 species of spores, six species of algae, one acritarch and two of uncertain affinities are described. The following species are mentioned for the first time for the Permian of Uruguay: Leiotriletescorius Kar and Bose, Brevitriletesleptoacaina Jones and Truswell, B.parmatus (Balme and Hennelly) Backhouse, Grossusporitesmicrogranulatus (Menéndez and Azcuy) Pérez Loinaze and Césari, Lundbladisporaareolata Césari, Archangelsky and Seoane, Cristatisporitesmenendezii (Menéndez and Azcuy) Playford, C.chacoparanaensis Ottone, Pilasporites sp. B Stephenson and Osterloff, and Brazileaplurigenus (Balme and Hennelly) Foster.Downloads
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