Stratigraphic and paleofloristic record of the Lower Permian postglacial succession in the southern Brazilian Paraná Basin
Roberto Iannuzzi, Paulo A. Souza, Michael Holz, 2010. "Stratigraphic and paleofloristic record of the Lower Permian postglacial succession in the southern Brazilian Paraná Basin", Late Paleozoic Glacial Events and Postglacial Transgressions in Gondwana, Oscar R. López-Gamundí, Luis A. Buatois
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A correlation between plant zones and palynozones within a sequence-stratigraphic framework for the upper Paleozoic rocks of the Paraná Basin, Brazil, is attempted for the first time. Our study indicates that (1) the stratigraphic boundaries (lithostratigraphic boundaries and sequence boundaries) are not coincident with most of the biostratigraphic horizons; (2) the boundaries between palynozones and plant zones are also not coincident with each other; and (3) the boundaries of palynozones lie near the maximum flooding surfaces through the interval analyzed. The emerging pattern suggests that plant zones are mostly controlled by depositional processes and palynozones by climate-driven changes. Therefore, the plant zones correspond to distinct ecofacies, and are better regarded as ecozones rather than as biozones. On the other hand, the climatic changes that affected the palynofloras were related directly to the most significant transgressive events, suggesting a link with eustatic oscillations caused by Early Permian Glacial-Interglacial Phases. Aims of further work may include (a) evaluation of taphonomic controls in plant-bearing beds, (b) better understanding of the relation between the plant-bearing strata and their equivalent palynologic zones, (c) correlation between palynologic and paleobotanic data and the sequence-stratigraphic framework already established in other areas, and (d) improvement of the chronostratigraphic chart of the basin through the discovery of layers suitable for radiometric dating.