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The study concerns the ostracod local biozonation and interbasinal correlation of the Frasnian strata within the East European Platform. The biozones are mainly environmentally controlled local assemblage zones. The taxonomic compositions and stratigraphic distributions show great similarities that have proved to be useful for intrabasinal correlations.During the Frasnian, the East European Platform (EEP) was covered by epicontinental tropical-subtropical seas, providing favourable conditions for the development of diverse and abundant fauna including ostracods. In the Frasnian strata, ostracods are an important component of the fossil assemblages and occur almost ubiquitously. Selected aspects of the Frasnian ostracods of the EEP have been examined in a number of publications, with emphases on taxonomy, biostratigraphy, or palaeoecology (Batalina