Abstract
New specimens of rhinocerotids including a complete skull of Diaceratherium asphaltense and a series of associated dental and postcranial elements of D.aginense and Pleuroceros pleuroceros have been discovered in two localities of the Swiss Molasse Basin: Bühler (?latest Oligocene-earliest Miocene, Canton Appenzell-Ausserhoden) and Sous le Mont (Early Miocene, Canton Bern). The record of D.asphaltense in Bühler may push its First Appearance Datum back to the latest Oligocene.Pleuroceros pleuroceros and Diaceratherium aginense co-occur at Sous le Mont. This assemblage is typical of the Agenian age in Western Europe. Sous le Mont is the second Swiss occurrence of P.pleuroceros beside Wischberg (MN1).