ABSTRACT: In the Bolucan (Zara-Sivas) region, `The Selimiye formation which is Oligocène in age, is composed of gypsium, sandstone, marl and dolomitized limestones. The sandstones are the dominant components of this formation. The sedimentary petrological characteristics of these sandstones have been investigated by using their light, heavy and clay mineral analysis. Chlorite, pyroxcene, biotite, muscovite and heavy mineral such as iron oxide rich opac minerals have been defined as gieywacke, rock fragmented sandstone and litfaic arenite perspectively according to the triangular classification diagrams of Van, Andel (1958) Travis (1970) and Folk et al (1970). In the clastic petrafaci.es classifications of Dickinson and Suczek (1979) and Dickinson (1982), mixed and recycled, provenance and orogen sources have been observed