Abstract: The topic of this study is the conglomerates consisting of large size components, 320 m thick having11 km lateral extent, observed in flysch type sediments in the NE of Nallıhan, The unit consists of only limestone metamorphic rock fragments, includes approximately 10% matrix; normal inverse gradation is frequentlyobserved. The size of constituents gets smaller from west to east from base to top. Grain orientation is verynoticeable parallel to outcrop continuity. It was assumed that this resedimented conglomerate had been formedby debris flow.