Travertines, as mostly Quaternary sediments, are a significant object for the study of the successional processes of plant and animal communities. In the Hornádska kotlina valley there are several different-aged travertine sites whose genesis is known, but the molluscan fauna has not been complexly assessed until now. This paper presents results on the succesional stages of mollusc communities in eight of the most significant travertine sites – Baldovce (Kamenec), Dreveník, Kozia hora, Ostrá hora, Paľica, Sivá Brada, Sobocisko and Spią castle hill. These localities are also important due to the presence of several rare and endangered mollusc taxa such as Clausilia dubia ingenua, C. d. carpatica, Chondrula tridens eximia, Vertigo angustior, Pupilla alpicola, P. triplicata, P. sterri, Helix lutescens etc.