Shell beds in the Albian-Cenomanian of the Pieniny Klippen Belt are nearly monospecific (paucispecific) and are composed of Aucellina sp. bivalves. Their sedimentary features and the host deposits indicate storm origin of the shell beds. The main mechanisms involved in their sedimentation were suspension and low-energy currents. Differences between various types of shell bed reflect the differences in energy of individual storms during which shell debris was eroded, fine material washed away and transported downslope.