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An overview of the composition of the paleoflora preserved in clay-siltstones of the Sideropolis Member, Rio Bonito Formation is presented in order to establish phytostratigraphical comparisons with other Late Pennsylvanian and Cisuralian paleofloras of the Parana Basin. The Rio Bonito Formation, the most important of the coal bearing lithostratigraphic units of the Parana Basin belongs to the Gondwana I Supersequence (Pennsylvanian-Early Triassic). The Sideropolis paleoflora occurs in the uppermost layers of coal of Rio Bonito Formation in Santa Catarina coalfield in four distinct localities of the State of Santa Catarina: Lauro Muller, Criciuma, Sao Marcos and Treviso. In this paleoflora the glossopterid leaves predominate with an evident dominance of the genus Glossopteris over Gangamopteris , followed by Cordaitalean leaves ( Noeggerathiopsis ) and seeds ( Cordaicarpus, Samaropsis, Cornucarpus ). Sterile fronds are common and few are fertile ( Sphenopteris, Pecopteris, Ponsotheca and Notoangaridium ). Pteridosperm reproductive structures ( Arberia, Arberiopsis, Ottokaria ) are not frequent and branches of conifers ( Brasilocladus, Buriadia ) are rare. Concerning other paleofloras of the basin, the Sideropolis paleoflora is distinguished by high diversity and many exclusive taxa showing only few similarities with some paleofloras registered in Rio Grande do Sul, occurring in outcrops of the Rio Bonito Formation such as Morro do Papaleo (upper section) and Quiteria. The differences may reflect an upper stratigraphic position, but may also indicate differences in sedimentation and / or in paleoecological conditions.

geologia usp. série científica

The Artinskian Siderópolis Member macroflora, Rio Bonito Formation and its stratigraphical correlation with other early Permian macrofloras of Paraná Basin, Brazil