An early Permian palynoflora from the Itararé Subgroup, Paraná Basin, Brazil

• Autores: L.M. Callegari, P. A. Souza
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 36, Nº. 3, 2004, págs. 439-450
• Idioma: español
• Enlaces
  • Texto Completo Ejemplar
• Resumen

  • A well-preserved palynoflora is recorded from the upper Itararé Subgroup in the northeastern portion of the Brazilian Paraná Basin, Tietê Municipality, São Paulo State. Among the 45 species identified, 3 are recorded for the first time from the Brazilian Paraná Basin, i. e. cf. Alatisporites sp., Pteruchipollenites indarraensis (Segroves) Foster, 1979, and a new combination: Horriditriletes spinobaculosus (Marques-Toigo) comb. nov. The palynoflora is dominated by gymnospermous taeniate and polyplicate pollen grains (mainly Protohaploxypinus, Illinites and Vittatina), which constitute up to 72% of the total assemblage. Trilete spores, mainly referable to Filicopsida and Lycopsida, are subordinate, reaching 15 to 42%. Non-taeniate bisaccate and monosaccate pollen grains (Coniferales, Cordaitales) are minor constituents. Algae (Botryococcus braunii and Tasmanites sp.) and incertae sedis (Deusilites tenuistriatus and Portalites gondwanensis) also occur. The spore-pollen assemblages are referable to the Vittatina costabilis Interval Zone of the Paraná Basin, particularly to the Protohaploxypinus goraiensis Subzone, dated as Sakmarian/Artinskian (Early Permian). Freshwater conditions, with a minor brackish influence, a possible lagoonal facies, are suggested.