The Ostracoda Subclass comprises the most expressive group of calcareous microfossils in the deposits of the Araripe Basin, especially in its post-rift sequence, which is represented by the Santana Group, of Late Aptian age (= Alagoas Local Stage). Due to the abundance, ostracod species are of great importance for understanding the evolution of the Araripe Basin, with direct application in biostratigraphic and paleoecological analyses. Improving these important applications involves refining the taxonomy of these ostracods, which also contributes to understanding the diversity of this fauna.
View Article and Find Full Text PDFA study of macro and microfacies, palynoflora and palynofacies of the non-marine Cerro Negro Formation at President Head Peninsula, Snow Island, northwest of the Antarctic Peninsula, was developed. Two assemblages were recognized: Palynofacies assemblage 1 (P1) at the base of the section with a dominance of fern spores and conifer pollen grains, and facies association consisting of a clastic layer, with the predominance of mudstones; and Palynofacies assemblage 2 (P2) at the top of the section, with remarkable abundance of AOM/Pseudoamorphous particles, associated with facies that includes tuffs. The complete section shows in some levels the presence of freshwater algae and translucent phytoclasts.
View Article and Find Full Text PDFA combined biostratigraphic and palaeoecological study of foraminifera, ostracodes and microfacies was carried out on the Aptian in the Sítio Sobradinho section of the Araripe Basin, northeast Brazil. The analysed section represents a deepening-upward sequence with mid-ramp shoal and outer ramp to basin facies associations on a mixed siliciclastic-carbonate marine ramp. The analysed rocks are dominated by Early Cretaceous planktic foraminifera (Hedbergella aptiana, H.
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