During the course of an investigation of fossil cave bear populations, the uranium-series method for absolute age determination has been applied to bone material. The applicability of the method to bone samples from alpine caves could be demonstrated by the concordance of uranium/thorium and uranium/proactinium ages and cross checks with the radiocarbon method. Stratigraphic agreement between bone ages and carbonate speleothem ages also indicates the potential of the uranium-series method as a suitable tool for the age determination of fossil bones from alpine cave environments.