Ozbak-Kuh Mountain is located in the north parts of Tabas Block in Central Iran Microcontinent. Base part of Jamal Formation is as old as Ghzelian Stage. The study of rugosa corals in the lower part of this formation leads to identification of one genus and three species for the first time in Iran. Late Carboniferous corals in Ozbak-Kuh have high abundance and low diversity. The presence of Late Pennsylvanian Pseudozaphrentoides , which is typical of paleoecologically resistant genus, absence of other coral genera, indicates temperature fluctuations in Ghzelian-Aselian boundary in Ozbak-kuh Regions. This study shows that after two suitable stages for corals life, intensive environmental fluctuations caused the absence of other corals ant this can suggest forming a limited platform.

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