Progress on the palynostratigraphy of the Permian strata in Rio Grande do Sul State, Paraná Basin, Brazil

Anais da Academia Brasileira de Ciências

Paulo A. Souza²  Marleni Marques-toigo¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Geociências Porto Alegre RS ,Brasil

关键词: Palynology;    Permian;    Paraná Basin;    biostratigraphy;    Rio Grande do Sul;    Palinologia;    Permiano;    Bacia do Paraná;    bioestratigrafia;    Rio Grande do Sul;   

DOI  :  10.1590/S0001-37652005000200012

来源: SciELO

【 摘 要 】

A review of published papers and results of analysis of new material have allowed improvements on the palynostratigraphy of the Permian strata of the Paraná Basin in Rio Grande do Sul State. Based on first and last occurrences of certain species of pollen taxa, two palynozones are formalized, these are the Vittatina costabilis and Lueckisporites virkkiae Interval Zones, in ascending order. The Vittatina costabilis Interval Zone is subdivided into two units, in ascending order the Protohaploxypinus goraiensis and the Hamiapollenites karrooensis Subzones, and is recognized from the glacial (Itararé Group) and post-glacial sequence (Rio Bonito Formation and the base of the Palermo Formation). The Lueckisporites virkkiae Interval Zone occurs from the uppermost Rio Bonito Formation, through the Palermo and Irati formations, and into the Serra Alta and Teresina formations. The main characteristics and reference sections are established, as well as additional criteria to recognize biostratigraphical units, in accordance with the International Stratigraphic Guide. Palynostratigraphical correlation suggests that the Vittatina costabilis Zone concerns the Early Permian (early Cisuralian), while the Lueckisporites virkkiae is regarded as late Early Permian to early Middle Permian (late Cisularian to early Guadalupian).

【 授权许可】

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