The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin

Anais da Academia Brasileira de Ciências

André Jasper²  Margot Guerra-sommer¹  Miriam Cazzulo-klepzig¹  Rualdo Menegat¹ 

[1] ,Centro Universitário UNIVATES Museu de Ciências Naturais Setor de Botânica e PaleobotânicaLajeado RS ,Brasil

关键词: Botrychiopsis;    biostratigraphy;    Paraná Basin;    Permian;    palaeoclimatology;    Gondwana;    Botrychiopsis;    biostratigrafia;    Bacia do Paraná;    Permiano;    paleoclimatologia;    Gondwana;   

DOI  :  10.1590/S0001-37652003000400009

来源: SciELO

【 摘 要 】

Botrychiopsis has been considered an important floristic element of Westphalian/Artinskian associations of the Paraná Basin. The occurrence of Botrychiopsis in roof-shales of the Rio Bonito Formation in Southern Paraná Basin (Quitéria area), supported by the identification of Botrychiopsis valida, enlarges the genus biochron. Consequently, the stratigraphic hierarchy for Botrychiopsis plantiana and Botrychiopsis valida was defined for the Paraná Basin. Although it is climatically controlled and related to a deglaciation icehouse stage, stratigraphic distribution of the genus presents a substantial climate tolerance, from cold/cool to warm/temperate conditions. A new phytostratigraphic zonation is proposed for the southern portion of the basin that includes the Botrychiopsis Zone (Asselian/Kungurian), which is subdivided into the Botrychiopsis plantiana (Asselian/Artinskian) and Botrychiopsis valida (Late Artinskian/Kungurian) subzones.

【 授权许可】

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