ABSTRACT: The terrigenous sedimentary rocks of Neogene intercalated with tuffs are widespread in the west of Kırkağaç (Manisa). According to detail petrographical studies, the tuff samples are generally named as dasitic vitric ash tuff considering principles of description. The crystal tuff and lithic tuff are occasionally described. Tuffs are determined to have dasitic character according to diagram showing mineral compositions but some tuff samples represent the products of andesite volcanism.