Estudio palinológico de esporas de la Formación Salto del Macho, Paleógeno de la Cuenca de Ñirihuau, Argentina

CORNOU, M. ELINA; MARTÍNEZ, MARCELO A.; QUATTROCCHIO, MIRTA E.; ASENSIO, MARCOS

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2010

0002-7014

Abstract. PALYNOLOGICAL STUDY OF SPORES FROM SALTO DEL MACHO FORMATION, PALEOGENE OF THE ÑIRIHUAU BASIN, ARGENTINA. The first palynological data from the type locality of the Salto del Macho Formation, at the Río Foyel section, Ñirihuau Basin, Argentina, is here presented. There have been recognized 19 taxa of trilete and monolete of Bryophyta and Tracheophyta (Lycopsida and Polypodiopsida) belong to the following genera: Anthocerisporis, Azolla, Baculatisporites, Biretisporites, Cingutriletes, Cyatheacidites, Cyathidites, Ischyosporites, Laevigatosporites, Matonisporites, Muricingulisporis, Peromonolites, Polypodiisporites, Reboulisporites, Retitriletes, Trilites and Tuberculatosporites. The palynoflora is dominated by Polypodiopsida Class with Cyatheaceae and Dicksoniaceae, in asociation whith Osmundaceae and Blechnaceae families. The comparison of the register of spores with that of other Paleogene-Early Neogene basins from Argentinian Patagonia, Chile and Antartic, reached through the PAST program, shows remarkable palynofloristic similarities between Salto del Macho Formation with the spore associations registered in the Río Foyel, Chenque and San Julián formations. The accompanying palynoflora (Nothofagaceae, Podocarpaceae, Araucariaceae, Myrtaceae, Botryococcus spp. and low diversity of dinocysts) suggests a marginal-marine enviroment, in conditions of sub-normal salinity and temperate-warm water temperature. PALYNOLOGICAL STUDY OF SPORES FROM SALTO DEL MACHO FORMATION, PALEOGENE OF THE ÑIRIHUAU BASIN, ARGENTINA. The first palynological data from the type locality of the Salto del Macho Formation, at the Río Foyel section, Ñirihuau Basin, Argentina, is here presented. There have been recognized 19 taxa of trilete and monolete of Bryophyta and Tracheophyta (Lycopsida and Polypodiopsida) belong to the following genera: Anthocerisporis, Azolla, Baculatisporites, Biretisporites, Cingutriletes, Cyatheacidites, Cyathidites, Ischyosporites, Laevigatosporites, Matonisporites, Muricingulisporis, Peromonolites, Polypodiisporites, Reboulisporites, Retitriletes, Trilites and Tuberculatosporites. The palynoflora is dominated by Polypodiopsida Class with Cyatheaceae and Dicksoniaceae, in asociation whith Osmundaceae and Blechnaceae families. The comparison of the register of spores with that of other Paleogene-Early Neogene basins from Argentinian Patagonia, Chile and Antartic, reached through the PAST program, shows remarkable palynofloristic similarities between Salto del Macho Formation with the spore associations registered in the Río Foyel, Chenque and San Julián formations. The accompanying palynoflora (Nothofagaceae, Podocarpaceae, Araucariaceae, Myrtaceae, Botryococcus spp. and low diversity of dinocysts) suggests a marginal-marine enviroment, in conditions of sub-normal salinity and temperate-warm water temperature.