Kolah Qazi area is a part of Central Iran Zone. Study of planktonic foraminifera led to recognition of three morphotype groupes. First morphotype group is charachteristed by trochospiral or biserial tests with globular chambers and indicates shallow waters. Hedbergella & Heterohelix from planktonic foraminifera, and Stomisphaera sphaeric, Pitonella ovalis, Calcisphaerula innominata from oligosteginids are in this group. Second morphotype group is index  of intermediate waters and consists of heavily ornamented globular, unkeeled chambers (Whiteinella archaeocretaceae), pustulose margins (Praeglobotruncana  stephani) and single or double keels (Dicarinella primitiva, Marginotruncana renzi,  Marginotruncana coronata) species. Third morphotype group is characterised by planoconvex  trochospiral (Helvetoglobotruncana praehelvetica), or high trochospiral (Praeglobotruncana gibba) tests and indicates deep waters. Study of morphotype group of planktonic foraminifera reveals an overall  regression through the succession.