Upper Cenomanian to lower Turonian deposits of the Silesian Unit of the Polish Flysch Carpathians comprise a characteristic interval of green and black shales with manganese concrections, tuff and bentonites. These strata are not only distinctive lithologically, but also contain a rich radiolarian fauna. Thirty-five species of Radiolaria have been identified. Spherical cryptothoracic and cryptocephalic Nassellaria dominate in the assemblage, especially species such as Holocryptocanium barbui, H. tuberculatum, Hemicryptocapsa prepolyhedra and H. polyhedra. The systematic description of fifteen species belonging to order Spumellaria and twenty species of Nassellaria is presented herein.