Abstract: The investigated area is situated in the south and southeast of Şarkışla (Sivas), in which formationsof Upper Cretaceous - Paleocene, Eocene, Oligocene and Pliocene ages crop out. While Upper Cretaceous - Paleoceneis represented by turbiditic limestones intercalated with tuff, Tuffite, volcanic sandstone and lavas, Eocene is only represented by conglomerate and clayey limestones. Both of them are in marine origin. Oligocene is composed oflagunar gypsium and iacustrine sandstone, conglomerate, and marls. As for to Pliocene is also represented conglomerates, clayey limestones and basalts in terrestrial origin- Ophiolitic melange occurrences forming the basement (?)in the study area have been emplaced by gravity slides in the form of olistostromes in  the sediments as seperatedsheets from Paleocene up to the end of middle Eocene. Volcanoclastics, turbiditic limestones, the secondary emplacement of the ophiolitic melange in the form of olistostromes and the geochemical character of the volcanism indicate that the study area has been developed as a kind of rear - arc basin during Paleocene time.