Palinología de la Formación Tasa Cuna (Pérmico Inferior), Córdoba, Argentina: sistemática y consideraciones bioestratigráficas

María Lucía Balarino, Pedro Raúl Gutiérrez

Abstract


Resumen. Se describe una asociación microflorística proveniente de la Formación Tasa Cuna, noroeste de la provincia de Córdoba, dentro del ámbito de la cuenca Paganzo. La misma es referida a la Biozona de Intervalo Pakhapitesfusus-Vittatinasubsaccata del Pérmico Inferior y se correlaciona con la Biozona Cristatisporites de la cuenca Chacoparaná. La presencia de Striatopodocarpitescommunis (Wilson) Hart, Vittatina sp cf. V.fasciolata (Balme y Hennelly) Bharadwaj, V.subsaccata Samoilovich emend. Jansonius, Vittatina sp. cf. V.vittifera (Luber) Samoilovich, Hamiapollenites sp. cf. H.bullaeformis (Samoilovich) Jansonius, H.fusiformis Marques-Toigo emend. Archangelsky y Gamerro, Pakhapitesfusus (Bose y Kar) Menéndez, Lunatisporites sp. cf. L.variesectus Archangelsky y Gamerro y Scheuringipollenitesmedius (Burjack) Dias-Fabrício, apoya la edad de la asociación. Se indentifica por primera vez para la Argentina Hamiapollenites sp. cf. H.bullaeformis, Striatopodocarpites sp. cf. S. crassus Singh, S. sp. cf. S. rarus (Bharadwaj y Salujha) Balme, S.communis (Wilson) Hart y Protohaploxypinushagii Foster. La asociación representaría a una comunidad vegetal de ambientes lénticos caracterizada por la abundancia de Licofitas, a su vez, influenciada por el aporte de comunidades gimnospérmicas (en particular, Coniferales y Cordaitales), quienes a pesar de tener requerimientos meso-xerofíticos, se habrían desarrollado cerca del cuerpo de agua donde se depositó la asociación.


Abstract. PALYNOLOGY OF THE TASA CUNA FORMATION (LOWER PERMIAN), CÓRDOBA, ARGENTINA: SYSTEMATICS AND BIOSTRATIGRAPHIC CONSIDERATIONS.A palynological association belonging to the Tasa Cuna Formation, northwest of Córdoba Province, Paganzo Basin, is described. This assemblage is referred to the Pakhapitesfusus-Vittatina subsaccata Biozone, Early Permian, and it is correlated with the Cristatisporites Biozone, Chacoparaná Basin. The ocurrences of Striatopodocarpitescommunis (Wilson) Hart, Vittatina sp. cf. V.fasciolata (Balme and Hennelly) Bharadwaj, V. subsaccata Samoilovich emend. Jansonius, Vittatina sp. cf. V.vittifera (Luber) Samoilovich, Hamiapollenites sp. cf. H.bullaeformis (Samoilovich) Jansonius, H.fusiformis Marques-Toigo emend. Archangelsky and Gamerro, Pakhapitesfusus (Bose and Kar) Menéndez, Lunatisporites sp. cf. L.variesectus Archangelsky and Gamerro, and Scheuringipollenitesmedius (Burjack) Dias-Fabrício, support the inclusion of this palynological as- sociation in the Early Permian. Some species such as Hamiapollenites sp. cf. H. bullaeformis (Samoilovich) Jansonius, Striatopodocarpites sp. cf. S.crassus Singh, S. sp. cf. S.rarus (Bharadwaj and Salujha) Balme, S. communis (Wilson) Hart, and Protohaploxypinushagii Foster, are identified in Argentina for the first time. This assemblage would represent a community related to lacustrine paleoenvironment characterized by abundant Lycophytes and influenced by a gymnospermic community (particularly Coniferales and Cordaitales) that, in spite of having meso-xerophytic requirements, would have been developed close to a fresh water body, where the assemblage was deposited.