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. The Aptian–Albian interval is characterized by significantpaleoclimatic, paleoceanographic, and paleogeographic changes, which in turnaffected the distribution and evolution of marine ecosystems. Despite theimportance of such studies, there have been few correlations betweenAptian–Albian sections of the Tethys Sea and those of the South AtlanticOcean. This interval, including the Aptian–Albian transition, is preservedin the deposits of the Riachuelo Formation (Sergipe–Alagoas Basin, Brazil)located in the South Atlantic Ocean; therefore, this location was chosen for drillingfour new cores. The goals of this paper are as follows: (1) to explain the drillingoperation carried out in the deposits of the Riachuelo Formation and themethods used; (2) to present a brief lithostratigraphic characterization ofthe holes and the paleomagnetic data of core SER-03; and (3) to describethe high potential of the cores recovered for additional investigation in thefuture. The lithostratigraphic units of the SER-01 core consist mainly ofcoarse- to fine-grained sandstone, shales, marls, and mudstones; the SER-02core was excluded due to low recovery; the SER-03 core is mainly composedof fine-grained sediments (shale, marls, and packstone) and bears someammonite shells; the lithology of core SER-04 is mainly sandstones.Magnetic susceptibility values (χlf and χhf) andfrequency-dependent susceptibility (χfd) data suggest that the sectionis located within the Cretaceous Normal Superchron. Future studies on thesecores integrating micropaleontological, paleoichnological, geochemical,stratigraphic, and paleomagnetic (e.g., relative intensity) data will allowfor a better understanding of paleoceanographic and paleogeographic eventsrelated to the early evolution of the South Atlantic Ocean and how theseevents correlate to similar events in Tethyan sections.

Drilling the Aptian–Albian of the Sergipe–Alagoas Basin, Brazil: paleobiogeographic and paleoceanographic studies in the South Atlantic