diversity of the early-miocene (burdigalian) ostracoda from northeastern semnan, central iran

Seven genera and seventeen species of marine ostracoda are reported for the first time from the attari section (qom formation),northeast of the semnan, central iran. in this section, the qom formation outcrops with 280 m thickness lies on the eocene volcanicand under the upper red formation. according to the distribution of index foraminifera, there is conspicuous similarity betweenlarger bentic foraminifera assemblages of the qom formation foraminifera and those of the zagros basin, such as borelis melocurdica the age of qom formation in the attari section is early miocene (burdigalian). the miocene and even oligocene ostracodafauna, relatively similar to the attari section, have been reported from the mediterranean area and the proto- indo- pacific ocean.the presence of one species with paratethian origin in the qom formation is strong evidence that during the burdigalian stage, thesea way between central iran and paratethys basin still existed.