Non-marine ostracods from the Late Jurassic–Early Cretaceous of Araripe, Jatobá and Tucano Norte basins, northeast Brazil Ostracodes non marins Jurassique Superieur–Cretace Inferieur des bassins d'Araripe, Jatobá et Tucano Norte, nord-est Bresil

Abstract

The Araripe, Jatobá and Tucano Norte basins, northeast Brazil, have an extensive fossil record. Among the groups found, are the ostracods, which have great relevance for this region due to their significant occurrence and wide diversity during the Upper Jurassic–Lower Cretaceous. These basins contain the rift process record of the Gondwana breakup for the posterior installation of the South Atlantic Ocean, data reinforced by the correlated ostracod non-marine fauna with some African basins. This paper presents a detailed taxonomic and biostratigraphic study of the ostracod species recovered from outcrops from these three basins. A total of 29 species were identified, distributed in eight genera: Theriosynoecum pricei, Theriosynoecum sp. cf. T. sp. 6, Cypridea acicularis, Cypridea ambigua, Cypridea indiennensis densipunctata, Cypridea sellata, Cypridea semilunaris, Cypridea vianai, Cypridea paraibensis, Cypridea (Morinina?) bibullata bibullata, Cypridea (Morinina?) bibullata tribullata, Cypridea sp. cf. C. (Morinina?) langei, Cypridea sp. cf. Cypridea miritiensis, Cypridea sp. 1, Paracypridea brasiliensis, Paracypridea quadrirugosa quadrirugosa, Paracypridea ex. gr. elegans, Salvadoriella redunca posterior, Reconcavona? jatobaensis, Reconcavona striata, Reconcavona striatula, Reconcavona swaini, Reconcavona aff. R.? polita, Reconcavona sp. cf. R. triebeli, Reconcavona sp.1, Reconcavona sp.2, Rhinocypris sp.1, Darwinula? sp. cf. D. oblonga, Alicenula sp. cf. Alicenula leguminella. From the identification of these species, it was possible to infer a stratigraphic range from Tithonian to Barremian, which corresponds to the local RT-001 to RT-007 biozones.