The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin

Abstract

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.

Depositional cyclicity and paleoecological variability in an outcrop of Rio Bonito formation, Early Permian, Paraná Basin, Rio Grande do Sul, Brazil

“…Pines rhomboidal-ovoid to rhomboidal-elongated (0.8-1.8 cm long, 1.3-1.8 cm wide) presenting an open venation derived from the rachis nervures. Detailed description in Jasper et al (2003). (Fig.…”

“…At the Quitéria outcrop, prostrate, subhorizontal, and horizontal plant fragments, including large sterile shoots, fertile shoots, and fronds, occur among the erect lycophyte casts (Jasper et al, 2003). The presence of Botrychiopsis valida in this megaflora enlarged the biochron of the genus.…”

“…The presence of Botrychiopsis valida in this megaflora enlarged the biochron of the genus. A phytostratigraphic zonation for southern Paraná Basin, based on the stratigraphic distribution of different species of Botrychiopsis, (Menegat et al, 1995). is proposed by Jasper et al (2003), who considered this taxon to have a broader climate tolerance than previously supposed, with different species ranging from cool-temperate to warmtemperate climates closely related to an icehouse stage (Jasper et al, 2005a). Herbaceous lycophytes (Lycopodites sp.)…”

Coricladus quiteriensis gen. et sp. nov., a new conifer in Southern-Brazil Gondwana (Lower Permian, Paraná Basin)

“…This exposure provides a rare look at the short-term spatial heterogeneity in contemporaneous deposits. For stratigraphic details see Piccoli et al (1991), Guerra-Sommer (1998, 1999) and Jasper et al (2003).…”

“…The plant assemblage here studied is included, by Jasper et al (2003), in the Botrychiopsis Zone/ Botrychiopsis valida Sub-zone (Artinskian/Kungurian Interval). This age are confirmed by CazzuloKlepzig et al (2002) with zircon radiometric dating of volcanic rocks interbedded in coal seams of Rio Bonito Formation in Southernmost Paraná Basin.…”