STRATI 2013 pp 1109-1113 | Cite as

New Palynological and Floral Information From the Potí Formation (Late Visean), Riacho do Roncador Creek, Parnaíba Basin, Northern Brazil

  • Roberto IannuzziEmail author
  • Mercedes di Pasquo
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)


The aim of this contribution is to present results on the first palynological assemblage recovered from surface deposits of the Potí Formation, which crops out in the Riacho do Roncador, northeastern Brazil. The Potí Formation unconformably overlies the Longá Formation and is unconformably overlain by the Lower Pennsylvanian Piaui Formation. The Potí Formation consists mainly of sandstones with minor proportions of carbonaceous shales and other siliciclastic lithologies; in parts it is fossiliferous, containing plant remains, bivalves, and palynomorphs of early late Visean age. The formation accumulated in fluvial to marine environmental settings. From a 5-m-thick outcrop, five carbonaceous shales and siltstones (3 m thick) yield diverse and abundant well-preserved palynomorphs. The assemblage is composed of 62 indigenous species, of which 57 are spores and 5 are algae, and 32 are reworked species (9 spores and 23 microplankton).The first records for the Mississippian of Brazil and South America are also presented. Stratigraphically significant species, some of them not previously recorded in subsurface investigations, include Anapiculatisporites concinnus, Tricidarisporites phippsae, Punctatisporites subvaricosus, Foveosporites pellucidus, Grandispora maculosa, Knoxisporites ruhlandi, Verrucosisporites morulatus, Retusotriletes mirabilis, and Waltzispora polita, which confirm the late Visean age of the Mag Zone. Worldwide comparison of the Brazilian association indicates an affinity with coeval palynofloras from the Gondwana region (South America and North Africa) and North America. The degree of similarity is likely to be determined by palaeolatitude. Sedimentological features along this section clearly reflect depositional environments ranging from brackish-deltaic to estuarine facies. The dominance of Botryococcus with varied morphologies through this section, the presence of reworking restricted to the uppermost level, and plant remains found in the basal part, support this interpretation.


Palynomorphs Biostratigraphy Palaeoenvironment Potí Formation Parnaíba Basin Brazil Late Visean 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Instituto de GeociênciasUniversidade Federal Río Grande do SulPorto AlegreBrazil
  2. 2.National Research Council of Argentina (CONICET) and Department of GeologyUniversity of Buenos Aires, Ciudad UniversitariaBuenos AiresArgentina

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