Kaveh Khaksar^1,, Fatemh Rezvannia², M. R. Kebriaei-Zadeh²

The Mobarak Formation in the Vali-Abad section (Central Alborz-South of Chalus) was studied at the central Alborz. The stratigraphical section show regressive sequences from Tournaisian to Namurian?. Three main environments containing rugosa and tabulate corals were identified: open shelf, oolitic shoals and lagoon. Up to 25 species of rugosa and tabulate corals belonging to 16 genera have been identified: Zaphrentites parallela, Zaphrentites delanouei, Ampelexizaphrentis iraniense, Ampelexizaphrentis sp., Siphonophyllia cylindrica cylindrica, Siphonophyllia iranica, Siphonophyllia cf. dorlodoti, Kueichophyllum alborsense minor, Kueichophyllum alborsense major, Caninia aff. irinae, Dibonophyllum bipartitum, Quinghaiphyllum pygmaeum, Aullophyllidae sp. Kailingophyllum sp., Marzanophyllum chalusense, Marzanophyllum crassiseptum, Hapsiphyllum sp.1, Hapsiphyllum sp.2, Zaphrentoides sp.A, Zaphrentoides sp. B, Ufimia sp., Hapsiphyllidae indet., Syringopora sp., Michelinia sp. and Favosittidae indet. Coral assemblages allow us to distinguish three biozones, with local value. Lowermost assemblage is composed of small, solitary, undissepimented corals and it is typical open and deep platform. Corals at assemblage II are must diverse and abundant. This assemblage developed at shallow areas of the open shelf. Assemblage III proceed from lagoon and it is composed of small, solitary, undissepimented corals. Iranian Lower Carboniferous corals belong to shallow areas of open shelf-lagoon of unique oceans. Tournaisian- Namurian? platform are well-developed in the Alborz, Central Alborz and Baluchestan and rich in fossil corals. They are extended from southeast to northwest in the area of Lower Carboniferous deposition.

corals, Tournaisian to Namurian?, Mobarak Formation, Vali-Abad section, Central Alborz, Iran