The 2008 field season of the Namibia Palaeontology Expedition was notable for the discovery of four small, but extremely richly fossiliferous carbonate deposits of Palaeogene age. The geology of two of the occurrences was briefly described in the 1970s in unpublished reports by geologists employed by The Consolidated Diamond Mines Ltd., (now Namdeb) but at the time no fossils were recognised in them. The deposits are at Silica North, Silica South, Black Crow and Steffenkop. Mammals have been found in the first three deposits, the last one having yielded only gastropods and plants. Provisional identifications of the mammals indicate the presence of at least 15 taxa. Other vertebrates include fish, crocodiles, ranoids, pipids, amphisbaenians, lizards, snakes and birds. All the deposits are rich in gastropods, ostracods and plant remains. Among the freshwater snails there are lymnaeids, hydrobiids and planorbids, while the land snail fauna is dominated by Dorcasia, with some Trigonephrus, Xerocerastus, Succinea and possibly a pupillid. This report provides preliminary descriptions and interpretations of the mammals from the deposits, briefly discusses the palaeobiogeography of the faunas and provides a provisional age determination on the basis of biochronology.