The pollen content of bore-hole samples and mine sections from the coast and from the bauxite belt of British Guiana has been studied. The pollen zonation is shown in fig. 6 and diagram IV. The description of the Upper Cretaceous and Tertiary pollen species is partly given in this article and partly in Van der Hammen, 1963; the Paleocene and Eocene species will be described in Leidelmeyer, 1965. The general picture obtained for the Guiana Basin, is summarized in three sections, one along the coast (fig. 18), one parallel to the Demerara River (fig. 24) and one parallel to the Berbice (fig. 25). The more detailed interpretation and correlation of the two deep coastal wells of Rose Hall and Shelter Belt is given in fig. 5. The situation in the bauxite areas is shown in fig. 17 and 20. The age of the bauxite (in the interval Lower Eocene to Lower Oligocene) corresponds to a hiatus in the coastal wells. Surprising is the thick Upper Cretaceous (Maestrichtian) basal infill of the basin. The dating and correlation of the Cretaceous and Tertiary formations of British Guiana is summarized in a stratigraphical table (fig. 26).