A Palynological study of the Cretaceous-Palaeogene (K-Pg) transition deposits in the Ell¨¨s section, northern Tunisia, revealed the presence of marine organic-walled microfossil assemblages formed essentially by well-preserved dinoflagellate cysts (dinocysts). The biostratigraphic interpretation of the dinocyst assemblages suggests a continuous sedimentation in the studied interval of the section and allows to place the K-Pg boundary just above the Latest Maastrichtian global marker acme of Manumiella seelandica and the last appearance of few Cretaceous taxa such as Dinogymnium spp., Alisogymnium euclaense and Pterodinium cretaceum, and directly below the first appearance of the basal Danian markers Damassadinium californicum, Membranilarnacia? tenella, Senoniasphaera inornata and Carpatella cornuta. This recognized boundary based on dinocyst biostratigraphy coincides with the K-Pg boundary previously known based on lithostratigraphy and planktic foraminiferal and calcareous nannofossil biostratigraphy. The observed dinocyst assemblage (Malloy suite) suggests a deposition in a tropical to subtropical or Tethyan province.
