Alveolinids and Nummulitids are among the most ubiquitous Large Benthic Foraminifera in Eocene shallow- marine deposites of Iran. Eocene sedimentary successions were studied for Foraminiferal assemblages at the Cholounak section, north of Torbat-e- Heydarieh -central Iran-. Our systematic survey revealed well- preserved alveolinids and nummulitids and led to the identification of 14 species and three subspecies. because the section analyzed has never been studied before we provied a detailed descriptions of the taxa present and a biostratigraphic scheme that is in accordance with standard shallow benthic zones -SBZ-. The study sheds new light on the paleobiogeographic distribution of Large Benthic Foraminifera from the Tethyan Ocean during the early Middle Cuisian -SBZ 10-11- and the Bartonian -SBZ !&-.

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