The Study of Small Foraminifera of Biseriammininae Subfamily in the Upper Permian Sediments (Dalan Formation) -of Oshtoran-Kuh in High Zagros

Biseriammininae subfamily includes genera that have great species diversity in Upper Permian sediments. This subfamily has a great distribution in Upper Permian sediments in most parts of Iran, especially Zagros Mountains. Based on identification of species and index species, the biozones have been presented that can be used for biostratigraphic study of the Permian sediments in the region Furthermore, according to the similarities and differences between genera and species of each genus phylogenic relationship can be demonstrated. The Oshtoran-kuh region has been selected of this study, be ….. the complete section of Upper Permian sediments is exposed in the Zagros basin. Sections of the different genera have been drawn by camera lucida instrument and species have been differentiated based on the structural properties of the shell. Finally 24 species of Globivalvulina genus, 8 species of Paraglobivalvulina genus and 1 species of Paraglobiva¬lvulinoides genus have been identified and the evolutionary pattern of these genera and their species are presented.