Fusulinacean in Tabas Block and Their Importance in Interpretation of Paleogeography and Paleoclimatology of the Cimmerian Continent


Fusulinacea are diverse and abundant in the Upper Carboniferous-Permian rocks of Tabas Block. The comparison between this region’s fusulinacea and Cimmerian Continent shows that during Upper Palaeozoic, Tabas Block was part of the west Cimmerian Continent. In the Cimmerian Continent, which the Tabas block is part of its west, the generic diversity of Permian fusulinacean fauna in space and time gradually increases from the Early to Late Middle Permian as well as from the eastern Cimmerian to the western areas. In contrast, the low generic diversity of Permian fusulinacean faunas in eastern Cimmerian against western ones is possibly due to an oblique placement of the continent to paleolatitude. Thus, the western Cimmerian Continent, compared to its eastern part, was closer to the tropical Tethyan. Based on the distribution of this fauna, the sedimentary succession of the studied area is subdivided into several sedimentary sequences including Late Ghezelian-Asselian, Bulurian, Kubergandian-Murgabian and Midian-Dourashamian in age.