The molluscs of the Rokytenské slepence conglomerate rocky valley were studied in years 2000 and 2002. Altogether, 63 species (52 gastropods, 11 bivalves) were found. Another two species (Unio crassus and Sphaerium rivicola) were recorded only as subfossil empty conchs and these bivalves probably became extinct in the river stretch under study.