Carboniferus corals in the Zaladu Section (Ozbak-kuh Mountains, Eastern Iran) were studied. In the studied section, 8 genera and 18 Species of rugose corals were identified. Based on Heritschioides, Paraherilschioides, Durhamina , Orygmophyllum, Fomichevella, Minatoa , Lithostrotion and Pseudozaphrentoides, the followin 3ecological zones were identified in the studied sections: Zone 1. Includes Heritschioides, Paraherilschioides, Durhamina and Orygmophyllum. With Late Serpokhovian age, consists of fasiculate dendroid and solitary corals, belonging to a quiete environment and low energy lagoon. Zone 2. Consists of Fomichevella, Minatoa and Lithostrotion. With Early Bashkirian age, belonging to a shallow barrier environment towarde an open marine. This zone composes of diversified colony builder corals and predominantly path like corals, resembeling cerioid and asteroid corals. The mentioned corals assemblage indicates to much more water agitation in a shallow setting. Zone 3. Includes Pseudozaphrentoides. With Gzhelian age, consists of large and thick dissepiment bearing corals, relating to a high energy shallow water environment and open marine toward barrier.

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