Calcareous nannofossils and planktic foraminifers in the upper Aptian of the Sergipe Basin, northeastern Brazil: palaeoecological inferences

In order to assess the effects of palaeoenvironmental fluctuations on the distributions of calcareous nannofossils and foraminifer species, semiquantitative analyses were carried out on a cored upper Aptian section in the Sergipe Basin, northeastern Brazil. In the lower part of the section, abundance peaks of Watznaueria barnesae, Nannoconus spp., and favusellids (a planktic foraminiferal morphogroup adapted to shallow, warm, carbonate-saturated...