<p><strong>Abstract.</strong> A detailed study of Miocene calcareous nannofossils using light and scanning electron microscope techniques has been undertaken on sections from the Cifciler, Mut and Silifke regions of the Mut Basin, southern Turkey. Age determinations are based upon a combination of previously published zonal schemes. Forty-one species are recorded; a new combination, <i>Pontosphaera segmenta</i> is also introduced.</p>