Introducing Fransian corals from Chahar-Borg section, NW Esfaraien, east Alborz

The Chahar-Borj stratigraphic section in north-west of Esfaraien, East Alborz, consists of Frasnian fossiliferous limestone succession. The main part of these carbonate is composed of solitary and compound corals. Up to 11 species of corals belonging to 8 genera have been distinguished. These are as follow: Scenophyllum sp., Tabulophyllum mcconnelli, Tabulophyllum gracile, Tabulophyllum sp., Sinodisphyllum variable, Sinodisphyllum litvinovitshae, Disphyllum virgatum, Temnophyllum lapparanti, Charactophyllum nanum, Michelina sp. and Syringopora sp.Based on the identified coral fossils, an age of Frasnian has been quoted to the unit. All identified species here, introduced for the first time from the studied area. Some identified index Frasnian species here have been reported from other parts of Iran: Alborz Mountains and Central Iran. This evidence display all this areas have been covered by the same sea. In a larger scale, similar situation have been reported from South of China, Australia and Afghanistan. This indicates similar latitude position for these areas.