A fauna of fossil vertebrates collected in an alluvial deposit in the Fiora River, in the Vulsini Volcanic District (locality Ponte San Pietro, Northern Latium, Central Italy) is described. Eighteen species have been collected: four amphibians (Triturus cf. T. vulgaris, Bufo bufo, Bufo viridis and Rana sp.), three reptiles (Testudinata indet., Lacerta gr. L. viridis and Hierophis viridiflavus) and eleven species of mammals (Talpa sp., Crocidura leucodon, Felis silvestris, Capreolus capreolus, ?Dama sp., Cricetus sp., Arvicola sp., Clethrionomys glareolus, Apodemus sylvaticus, Glis glis and Muscardinus avellanarius). The fossil assemblage lived, very probably, in a riparian forested area as indicated by the predominance of C. Glareolus and A. sylvaticus and the presence of glirids, wild cat, roe deer and many amphibians. The evolutionary stage of Arvicola combined to the presence of Cricetus point to an attribution to MIS4 or MIS5b (Late Pleistocene). This biochronological datum fit very well with the radiometric data.
