BIOESTRATIGRAFIA DO CRETÁCEO MARINHO DA BACIA DE CAMPOS, BRASIL

An accurate biostratigraphic framework of the Cretaceous marine section of Campos Basin was established based on studies of foraminifera, nannofossils, and palynomorphs. With the research of 77 wells it was possible to subdivide the Albian-Maastrichtian section in 11 zones of foraminifera,6 zones of nannofossils, and 7 zones of palynomorphs (the study ofwhich was restricted to the Albian-Santonian stages). Some of these zones remain still informal. Three main regional unconformities were found in the biostratigraphic sequence. These gaps correspond to the Early-Middle Cenomanian, Middle-Late Turonian and Campanian. Less important hiatuses were also found in the area.