Abstract
The first fusulinids have been recorded from the eastern part of the Sabzevar tectonic block (Kuh-e-Ahuban Mountains, to the north of the town of Kashmar). The fusulinids have been grouped into two complexes. The first complex is represented by several species of the genus Rauserites, of probable Gzhelian age. The second complex is represented by numerous representatives of the Asselian genera Sphaeroschwagerina and Pseudoschwagerina, as well as species of the genera Schubertella, Rugosofusulina, Rugosochusenella and Praepseudofusulina. The age of these complexes is similar to that of complexes previously described from sections of Anarak (the Yazd block) and Zaladou (the Tabas block), but differ in the species composition. Many of the species present in these complexes are similar or identical to species from standard sections of Gzhelian and Asselian Stages of the Moskovian syncline and the Urals, which indicates that there were free connections between the East European and Iranian basins in Gzhelian and Asselian Stages.
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