The Codó Formation, one of the best known Cretaceous sedimentary sequences in Northeastern Brazil, is quite noteworthy from a paieontological point of view. Its age and biostratigraphic relationships have been established on the basis of a palynologic zonation made by PETROBRÁS. The work here presented re-examines this question, starting with the identification of all the palynomorph species present in two wells drilled in the Codó region, whose outcrops served as the basis for the original proposal of this stratigraphic unit. Ninety-four species are here identified, including some reworked forms from the Devonian and Permian of the basin. The studied associations reaffirm the Aptian age commonly accepted for the formation. Paleoecological observations are also made.
