Abstract: The study area is situated in the Ağcakışla (Şarkışla) area of the western edge of the Sivas Basin which isone of the major Tertiary basins of Central Anatolia. The Tokuş Formation, which is the subject of this study, begins with conglomerate at the base, and constitutes with pebbly sandstone and coarse-grained sandstone.The unit consists of limestone with Alveolina and Nummulites and marl with planktonic foraminifera. Thebenthic foraminifera such as Alveolina minuta Checchia-Rispoli, Alveolina schwageri Checchia-Rispoli,Alveolina seni Sirel and Acar, Alveolina archiaci Sirel and Acar, Alveolina cremae Checchia-Rispoli,Alveolina cremae elongata Sirel and Acar, Alveolina tenuis Hottinger, Alveolina fusiformis Sowerby,Alveolina aff. callosa Hottinger, Alveolina aff. colatiensis Drobne, Orbitolites complanatus Lamarck,Fabiania cassis (Oppenheim), Gyroidinella magna (Le Calvez), Sphaeorogypsina globulus (Reuss),Asterigerina rotula (Kaufmann), Lockhartia hunti Ovey, Lockhartia tipperi (Davies), Assilina exponens(Sowerby), Nummulites deshayesi D’Archiac, Nummulites aturicus (Joly and Leymerie), Nummulitesperforatus (De Montfort) and Discocyclina sp. were described. According to fossil assemblage, CuisianBartonian age was given, and shallow benthic foraminifera biozones (SBZ) were described.