Thin Section Studies on Foraminifera from Limestone of Gurpi Formation (Cretaceous) Sarableh, North of Ilam Area, Iran

Gurpi Formation is one of the important formations in the Zagros Mountain which belongs to Cretaceous age. Cretaceous is one of the important geological period showing the global record form stratigraphic important. Many fossil records are important showing stratigraphic boundary between Cretaceous and Tertiary (K-T). The present investigation of microfossils in particular Foraminifera has a good amount of well preservation in limestone. Thin section reveals a large amount of preservations in the limestone sedimentary beds in different orientation. Thin section data are good and reliable data in particular on depositional condition. About twenty eight rock samples from different height of the quarry section. About twenty eight samples which are a presentation from limestone deposits the selected thin section study under phase contrast microscopes have observed and identified their coiling pattern, morphology shown typical characters like chambers arrangements and other characters. Fifteen taxa of foraminifera were identified on their coiling, chamber arrangement and size data also. By using thin section data by oriented samples of limestone helps to interpret the depositional conditions.