Biostratigraphy and paleoecology of an unusual palynological record from the Aquidauana Formation, Late Pennsylvanian of Paraná Basin

Autor(es)

Souza, Paulo A. ^[1] ; Perinotto, Jose A. J. ^[2] ; Felix, Cristina M. ^[1] ; Araujo, Bruno C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande do Sul, Inst Geociencias, Lab Palinol Marleni Marques Toigo, Programa Posgrad Geociencias, BR-91540000 Porto Alegre, RS - Brazil

^[2] Univ Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Programa Posgrad Geociencias & Meio Ambiente, BR-13506900 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 87, n. 2, p. 611-622, JUN 2015.
• Citações Web of Science: 4

Resumo

The Aquidauana Formation is a Permo-Carboniferous sedimentary unit, widely stratigraphicaly distributed in the northwestern and northern portions of the Paraná Basin. However, little paleontological data is available from this formation, preventing accurate biostratigraphic and paleoecological interpretations. An abundant, diversified and well preserved assemblage of palynomorphs was recognized from sampling conducted in an outcrop section in Cipolândia District of Aquidauana Municipality, state of Mato Grosso do Sul, Brazil. A total of 35 indigenous palynomorph taxa was recognized, comprising 6 species of spores (related to 5 genera), 28 species of pollen grains (14 genera) and 1 species of chlorophycean algae. Monosaccate pollen grains are exceptionally dominant, representing 90.38% of the association, particularly constituted by species of the genera Cannanoropollis (30.41% of the total assemblage), Potonieisporites (28.14%) and Plicatipollenites (19.52%). This quantitative overrepresentation is not usual from Gondwana deposits, revealing a particular plant dominance of Cordaitales in the terrestrial flora. These results are interpreted as an upland ecology characterized by plants with a moisture-independent reproduction strategy, under a glacial climate influence. Certain species of pollen allow assignment of this assemblage to the Crucisaccites monoletus Zone (Late Pennsylvanian), which had been recognized only in the middle portion of the Itararé Group at the northeastern margin of the basin. (AU)

• Processo FAPESP: 09/50876-4 - Unidades glaciais permocarboniferas da bacia do parana: relacoes estratigraficas e tratos deposicionais do grupo itarare e da formacao aquidauana na faixa aflorante no estado de sao paulo.
• Beneficiário: José Alexandre de Jesus Perinotto
• Modalidade de apoio: Auxílio à Pesquisa - Regular