PALINOLOGÍA DE LA FORMACIÓN MELO (PÉRMICO INFERIOR) EN ARROYO SECO, DEPARTAMENTO RIVERA, REPÚBLICA ORIENTAL DEL URUGUAY. PARTE IV: ESPORAS

Abstract

The microfloristic study of the Melo Formation, Lower Permian, at Arroyo Seco, Rivera Department, Uruguay, is presented. The palynological assemblage includes miospores, incertae sedis and acritarchs. In the present contribution thirty six species of microspores are treated systematically. Leiotriletes tenuis Azcuy, Calamospora smileyana Menéndez, Converrucosisporites naumoviae (Hart) Backhouse, Apiculiretusispora sp. cf. manantialensis Ottone, Horriditriletes tereteangulatus (Balme and Hennelly) Backhouse, Neoraistrickia gracilis Foster, Microreticulatisporites inaequalis Menéndez and Azcuy, Convolutispora punctatimura Staplin, Diatomozonotriletes townrowii Segroves, Gondisporites wilsonii Backhouse, Gondisporites serrulatus Césari, Archangelsky and Villar de Seoane, lndotrirradites niger (Segroves) Backhouse, Laevigatosporites colliensis (Balme and Hennelly) Venkatachala and Kar, Reticuloidosporites warchianus Balme and Polypodiites mutabilis Balme are cited for the first time from the Permian of Uruguay. The microspores have been recovered at the so called Yittatina-Granulatisporites, Lundbladispora, and Convolutispora levels, from the basal half of the Arroyo Seco log, whithin the continental section of the unit.