Sauropods of the Itapecuru Group (Lower/Middle Albian), São Luís-Grajaú Basin, Maranhão State, Brazil

In this paper, new sauropod remains from the lower/middle Albian of the Itapecuru Group, So Lus-Graja Basin, Maranho State (Brazil) are described. The material comprises vertebral centra, fragments of neural arches and a fragment of the proximal end of a humerus of limited diagnostic value. Morphological analyses of these elements indicate the presence of titanosaur sauropods and taxa related to the Rebbachisauridae. Sauropods are documented in the lower/middle Albian deposits assigned to the 'Undifferentiated Unit' for the first time. Previous occurrences of these herbivores are known from Cenomanian rocks of the Alcntara Formation, which overlays the Undifferentiated Unit. Although fragmentary, the reported fossils extend the record of sauropods in Brazilian Cretaceous deposits.