Biostratigraphic analysis based on palynomorphs and ostracods from core 2-JNS-01PE, Lower Cretaceous, Jatobá Basin, northeastern Brazil

This manuscript presents a biostratigraphic analysis based on non-marine palynomorphs and ostracods during the interval corresponding to the Aptian - lower Albian (local Alagoas stage) in the Jatobá Basin, northeastern Brazil. The data used for the analysis were from 179 samples collected in core 2-JSN-01-PE, which was drilled in the locality of Serra Negra, municipality of Ibimirim, Pernambuco. Of the 179 samples collected and prepared, only 23 presented ostracods, whereas 64 levels were carriers of organic waste, which aided in the biostratigraphic correlation of the studied core. From the palynological data, it was possible to identify the upper limit of the Inaperturopollenites turbatus (P-260) palynozone and the Sergipea variverrucata (P-270) palynozone and the lower limit of the Complicatisaccus cearensis (P-280) palynozone in the core 2-JSN-01-PE. Among the palynozones, the upper limit of P-260, whose record is difficult to track in northeastern Brazil and has been identified only in the Sergipe/Alagoas basin, and the limit of P-270 and P-280 in the Jatobá Basin, which had not yet been identified, can be highlighted. From the data based on non-marine ostracods, it was possible identify the “Cytheridea”? spp. ex. Group 201/218 Biozone (herein designated Damonella grandiensis), code 011. Such record in the Jatobá Basin is represented for a diverse fauna when compared with the record of monospecific fauna initially proposed in the Sergipe/Alagoas Basin.