A skull of Mustela (Putorius) eversmanni soergeli Éhik, discovered by a dredger working in gravels and sands of the Lower-Terrace of the River Leine, is used as a test of the reliability of this species in stratigraphy, and as an ecological indicator. Up to the present time M. eversmanni has been found in Central Europe with certainly only in different periods from the Würm Ice-Age and never in stratas older or younger than the Würm. Its present distribution is rather clothely tied to the semi- and cultivated steppe-lands and to the true steppes, but above all, to the warmer parts of the Eurasian steppe region. In the Würm Ice-Age, the species will not have lived in conditions essentially different from these. From this the conclusion has been drawn that durings the stadials there were not only dry-cold but also dry-warmer phases.