Abstract: This study is aimed to provide some new information on the stratigraphy, paleontology and structural features ofGürlevik limestone (Arpat, 1964) locating in the area to the southeast of Sivas. In this area, the carbonates era rich in benthic foraminifers of Thanetian such as: Daviesina danteli Smout, Rotalİa trochidlformis Lamarck, Mississippina blnkhorst! Reuss,Pseudolacazİna oeztemuerİ (Sirel). They are thought to be deposited in the shallow-low energy marine environment. It has been determined that Gürlevik limestone shows the lateral transition to Tecer formation (inan ve înan, 1987) according to their paleontogic,stratigraphic and structural charecters. Based on these determinations, it is concluded that both these units should be named as Tecer formation.